import firebase from '@firebase/app';
import { stringify, jsonEval, contains, assert, base64, stringToByteArray, Sha1, forEach, isNodeSdk, stringLength, errorPrefix, validateArgCount, validateCallback, Deferred, assertionError, safeGet, clone, map, getCount, getAnyKey, every, validateContextObject, isEmpty, getValues, findValue, findKey, deepCopy, isMobileCordova, base64Encode, CONSTANTS, isAdmin, isValidFormat, isReactNative, querystring } from '@firebase/util';
import { Logger, LogLevel } from '@firebase/logger';

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Wraps a DOM Storage object and:
 * - automatically encode objects as JSON strings before storing them to allow us to store arbitrary types.
 * - prefixes names with "firebase:" to avoid collisions with app data.
 *
 * We automatically (see storage.js) create two such wrappers, one for sessionStorage,
 * and one for localStorage.
 *
 * @constructor
 */
class DOMStorageWrapper {
    /**
     * @param {Storage} domStorage_ The underlying storage object (e.g. localStorage or sessionStorage)
     */
    constructor(domStorage_) {
        this.domStorage_ = domStorage_;
        // Use a prefix to avoid collisions with other stuff saved by the app.
        this.prefix_ = 'firebase:';
    }
    /**
     * @param {string} key The key to save the value under
     * @param {?Object} value The value being stored, or null to remove the key.
     */
    set(key, value) {
        if (value == null) {
            this.domStorage_.removeItem(this.prefixedName_(key));
        }
        else {
            this.domStorage_.setItem(this.prefixedName_(key), stringify(value));
        }
    }
    /**
     * @param {string} key
     * @return {*} The value that was stored under this key, or null
     */
    get(key) {
        const storedVal = this.domStorage_.getItem(this.prefixedName_(key));
        if (storedVal == null) {
            return null;
        }
        else {
            return jsonEval(storedVal);
        }
    }
    /**
     * @param {string} key
     */
    remove(key) {
        this.domStorage_.removeItem(this.prefixedName_(key));
    }
    /**
     * @param {string} name
     * @return {string}
     */
    prefixedName_(name) {
        return this.prefix_ + name;
    }
    toString() {
        return this.domStorage_.toString();
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An in-memory storage implementation that matches the API of DOMStorageWrapper
 * (TODO: create interface for both to implement).
 *
 * @constructor
 */
class MemoryStorage {
    constructor() {
        this.cache_ = {};
        this.isInMemoryStorage = true;
    }
    set(key, value) {
        if (value == null) {
            delete this.cache_[key];
        }
        else {
            this.cache_[key] = value;
        }
    }
    get(key) {
        if (contains(this.cache_, key)) {
            return this.cache_[key];
        }
        return null;
    }
    remove(key) {
        delete this.cache_[key];
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Helper to create a DOMStorageWrapper or else fall back to MemoryStorage.
 * TODO: Once MemoryStorage and DOMStorageWrapper have a shared interface this method annotation should change
 * to reflect this type
 *
 * @param {string} domStorageName Name of the underlying storage object
 *   (e.g. 'localStorage' or 'sessionStorage').
 * @return {?} Turning off type information until a common interface is defined.
 */
const createStoragefor = function (domStorageName) {
    try {
        // NOTE: just accessing "localStorage" or "window['localStorage']" may throw a security exception,
        // so it must be inside the try/catch.
        if (typeof window !== 'undefined' &&
            typeof window[domStorageName] !== 'undefined') {
            // Need to test cache. Just because it's here doesn't mean it works
            const domStorage = window[domStorageName];
            domStorage.setItem('firebase:sentinel', 'cache');
            domStorage.removeItem('firebase:sentinel');
            return new DOMStorageWrapper(domStorage);
        }
    }
    catch (e) { }
    // Failed to create wrapper.  Just return in-memory storage.
    // TODO: log?
    return new MemoryStorage();
};
/** A storage object that lasts across sessions */
const PersistentStorage = createStoragefor('localStorage');
/** A storage object that only lasts one session */
const SessionStorage = createStoragefor('sessionStorage');

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const logClient = new Logger('@firebase/database');
/**
 * Returns a locally-unique ID (generated by just incrementing up from 0 each time its called).
 * @type {function(): number} Generated ID.
 */
const LUIDGenerator = (function () {
    let id = 1;
    return function () {
        return id++;
    };
})();
/**
 * Sha1 hash of the input string
 * @param {!string} str The string to hash
 * @return {!string} The resulting hash
 */
const sha1 = function (str) {
    const utf8Bytes = stringToByteArray(str);
    const sha1 = new Sha1();
    sha1.update(utf8Bytes);
    const sha1Bytes = sha1.digest();
    return base64.encodeByteArray(sha1Bytes);
};
/**
 * @param {...*} var_args
 * @return {string}
 * @private
 */
const buildLogMessage_ = function (...var_args) {
    let message = '';
    for (let i = 0; i < var_args.length; i++) {
        if (Array.isArray(var_args[i]) ||
            (var_args[i] &&
                typeof var_args[i] === 'object' &&
                typeof var_args[i].length === 'number')) {
            message += buildLogMessage_.apply(null, var_args[i]);
        }
        else if (typeof var_args[i] === 'object') {
            message += stringify(var_args[i]);
        }
        else {
            message += var_args[i];
        }
        message += ' ';
    }
    return message;
};
/**
 * Use this for all debug messages in Firebase.
 * @type {?function(string)}
 */
let logger = null;
/**
 * Flag to check for log availability on first log message
 * @type {boolean}
 * @private
 */
let firstLog_ = true;
/**
 * The implementation of Firebase.enableLogging (defined here to break dependencies)
 * @param {boolean|?function(string)} logger_ A flag to turn on logging, or a custom logger
 * @param {boolean=} persistent Whether or not to persist logging settings across refreshes
 */
const enableLogging = function (logger_, persistent) {
    assert(!persistent || (logger_ === true || logger_ === false), "Can't turn on custom loggers persistently.");
    if (logger_ === true) {
        logClient.logLevel = LogLevel.VERBOSE;
        logger = logClient.log.bind(logClient);
        if (persistent)
            SessionStorage.set('logging_enabled', true);
    }
    else if (typeof logger_ === 'function') {
        logger = logger_;
    }
    else {
        logger = null;
        SessionStorage.remove('logging_enabled');
    }
};
/**
 *
 * @param {...(string|Arguments)} var_args
 */
const log = function (...var_args) {
    if (firstLog_ === true) {
        firstLog_ = false;
        if (logger === null && SessionStorage.get('logging_enabled') === true)
            enableLogging(true);
    }
    if (logger) {
        const message = buildLogMessage_.apply(null, var_args);
        logger(message);
    }
};
/**
 * @param {!string} prefix
 * @return {function(...[*])}
 */
const logWrapper = function (prefix) {
    return function (...var_args) {
        log(prefix, ...var_args);
    };
};
/**
 * @param {...string} var_args
 */
const error = function (...var_args) {
    const message = 'FIREBASE INTERNAL ERROR: ' + buildLogMessage_(...var_args);
    logClient.error(message);
};
/**
 * @param {...string} var_args
 */
const fatal = function (...var_args) {
    const message = `FIREBASE FATAL ERROR: ${buildLogMessage_(...var_args)}`;
    logClient.error(message);
    throw new Error(message);
};
/**
 * @param {...*} var_args
 */
const warn = function (...var_args) {
    const message = 'FIREBASE WARNING: ' + buildLogMessage_(...var_args);
    logClient.warn(message);
};
/**
 * Logs a warning if the containing page uses https. Called when a call to new Firebase
 * does not use https.
 */
const warnIfPageIsSecure = function () {
    // Be very careful accessing browser globals. Who knows what may or may not exist.
    if (typeof window !== 'undefined' &&
        window.location &&
        window.location.protocol &&
        window.location.protocol.indexOf('https:') !== -1) {
        warn('Insecure Firebase access from a secure page. ' +
            'Please use https in calls to new Firebase().');
    }
};
/**
 * Returns true if data is NaN, or +/- Infinity.
 * @param {*} data
 * @return {boolean}
 */
const isInvalidJSONNumber = function (data) {
    return (typeof data === 'number' &&
        (data != data || // NaN
            data == Number.POSITIVE_INFINITY ||
            data == Number.NEGATIVE_INFINITY));
};
/**
 * @param {function()} fn
 */
const executeWhenDOMReady = function (fn) {
    if (isNodeSdk() || document.readyState === 'complete') {
        fn();
    }
    else {
        // Modeled after jQuery. Try DOMContentLoaded and onreadystatechange (which
        // fire before onload), but fall back to onload.
        let called = false;
        let wrappedFn = function () {
            if (!document.body) {
                setTimeout(wrappedFn, Math.floor(10));
                return;
            }
            if (!called) {
                called = true;
                fn();
            }
        };
        if (document.addEventListener) {
            document.addEventListener('DOMContentLoaded', wrappedFn, false);
            // fallback to onload.
            window.addEventListener('load', wrappedFn, false);
        }
        else if (document.attachEvent) {
            // IE.
            document.attachEvent('onreadystatechange', function () {
                if (document.readyState === 'complete')
                    wrappedFn();
            });
            // fallback to onload.
            window.attachEvent('onload', wrappedFn);
            // jQuery has an extra hack for IE that we could employ (based on
            // http://javascript.nwbox.com/IEContentLoaded/) But it looks really old.
            // I'm hoping we don't need it.
        }
    }
};
/**
 * Minimum key name. Invalid for actual data, used as a marker to sort before any valid names
 * @type {!string}
 */
const MIN_NAME = '[MIN_NAME]';
/**
 * Maximum key name. Invalid for actual data, used as a marker to sort above any valid names
 * @type {!string}
 */
const MAX_NAME = '[MAX_NAME]';
/**
 * Compares valid Firebase key names, plus min and max name
 * @param {!string} a
 * @param {!string} b
 * @return {!number}
 */
const nameCompare = function (a, b) {
    if (a === b) {
        return 0;
    }
    else if (a === MIN_NAME || b === MAX_NAME) {
        return -1;
    }
    else if (b === MIN_NAME || a === MAX_NAME) {
        return 1;
    }
    else {
        const aAsInt = tryParseInt(a), bAsInt = tryParseInt(b);
        if (aAsInt !== null) {
            if (bAsInt !== null) {
                return aAsInt - bAsInt == 0 ? a.length - b.length : aAsInt - bAsInt;
            }
            else {
                return -1;
            }
        }
        else if (bAsInt !== null) {
            return 1;
        }
        else {
            return a < b ? -1 : 1;
        }
    }
};
/**
 * @param {!string} a
 * @param {!string} b
 * @return {!number} comparison result.
 */
const stringCompare = function (a, b) {
    if (a === b) {
        return 0;
    }
    else if (a < b) {
        return -1;
    }
    else {
        return 1;
    }
};
/**
 * @param {string} key
 * @param {Object} obj
 * @return {*}
 */
const requireKey = function (key, obj) {
    if (obj && key in obj) {
        return obj[key];
    }
    else {
        throw new Error('Missing required key (' + key + ') in object: ' + stringify(obj));
    }
};
/**
 * @param {*} obj
 * @return {string}
 */
const ObjectToUniqueKey = function (obj) {
    if (typeof obj !== 'object' || obj === null)
        return stringify(obj);
    const keys = [];
    for (let k in obj) {
        keys.push(k);
    }
    // Export as json, but with the keys sorted.
    keys.sort();
    let key = '{';
    for (let i = 0; i < keys.length; i++) {
        if (i !== 0)
            key += ',';
        key += stringify(keys[i]);
        key += ':';
        key += ObjectToUniqueKey(obj[keys[i]]);
    }
    key += '}';
    return key;
};
/**
 * Splits a string into a number of smaller segments of maximum size
 * @param {!string} str The string
 * @param {!number} segsize The maximum number of chars in the string.
 * @return {Array.<string>} The string, split into appropriately-sized chunks
 */
const splitStringBySize = function (str, segsize) {
    const len = str.length;
    if (len <= segsize) {
        return [str];
    }
    const dataSegs = [];
    for (let c = 0; c < len; c += segsize) {
        if (c + segsize > len) {
            dataSegs.push(str.substring(c, len));
        }
        else {
            dataSegs.push(str.substring(c, c + segsize));
        }
    }
    return dataSegs;
};
/**
 * Apply a function to each (key, value) pair in an object or
 * apply a function to each (index, value) pair in an array
 * @param {!(Object|Array)} obj The object or array to iterate over
 * @param {function(?, ?)} fn The function to apply
 */
const each = function (obj, fn) {
    if (Array.isArray(obj)) {
        for (let i = 0; i < obj.length; ++i) {
            fn(i, obj[i]);
        }
    }
    else {
        /**
         * in the conversion of code we removed the goog.object.forEach
         * function which did a value,key callback. We standardized on
         * a single impl that does a key, value callback. So we invert
         * to not have to touch the `each` code points
         */
        forEach(obj, (key, val) => fn(val, key));
    }
};
/**
 * Borrowed from http://hg.secondlife.com/llsd/src/tip/js/typedarray.js (MIT License)
 * I made one modification at the end and removed the NaN / Infinity
 * handling (since it seemed broken [caused an overflow] and we don't need it).  See MJL comments.
 * @param {!number} v A double
 * @return {string}
 */
const doubleToIEEE754String = function (v) {
    assert(!isInvalidJSONNumber(v), 'Invalid JSON number'); // MJL
    const ebits = 11, fbits = 52;
    let bias = (1 << (ebits - 1)) - 1, s, e, f, ln, i, bits, str;
    // Compute sign, exponent, fraction
    // Skip NaN / Infinity handling --MJL.
    if (v === 0) {
        e = 0;
        f = 0;
        s = 1 / v === -Infinity ? 1 : 0;
    }
    else {
        s = v < 0;
        v = Math.abs(v);
        if (v >= Math.pow(2, 1 - bias)) {
            // Normalized
            ln = Math.min(Math.floor(Math.log(v) / Math.LN2), bias);
            e = ln + bias;
            f = Math.round(v * Math.pow(2, fbits - ln) - Math.pow(2, fbits));
        }
        else {
            // Denormalized
            e = 0;
            f = Math.round(v / Math.pow(2, 1 - bias - fbits));
        }
    }
    // Pack sign, exponent, fraction
    bits = [];
    for (i = fbits; i; i -= 1) {
        bits.push(f % 2 ? 1 : 0);
        f = Math.floor(f / 2);
    }
    for (i = ebits; i; i -= 1) {
        bits.push(e % 2 ? 1 : 0);
        e = Math.floor(e / 2);
    }
    bits.push(s ? 1 : 0);
    bits.reverse();
    str = bits.join('');
    // Return the data as a hex string. --MJL
    let hexByteString = '';
    for (i = 0; i < 64; i += 8) {
        let hexByte = parseInt(str.substr(i, 8), 2).toString(16);
        if (hexByte.length === 1)
            hexByte = '0' + hexByte;
        hexByteString = hexByteString + hexByte;
    }
    return hexByteString.toLowerCase();
};
/**
 * Used to detect if we're in a Chrome content script (which executes in an
 * isolated environment where long-polling doesn't work).
 * @return {boolean}
 */
const isChromeExtensionContentScript = function () {
    return !!(typeof window === 'object' &&
        window['chrome'] &&
        window['chrome']['extension'] &&
        !/^chrome/.test(window.location.href));
};
/**
 * Used to detect if we're in a Windows 8 Store app.
 * @return {boolean}
 */
const isWindowsStoreApp = function () {
    // Check for the presence of a couple WinRT globals
    return typeof Windows === 'object' && typeof Windows.UI === 'object';
};
/**
 * Converts a server error code to a Javascript Error
 * @param {!string} code
 * @param {!Query} query
 * @return {Error}
 */
const errorForServerCode = function (code, query) {
    let reason = 'Unknown Error';
    if (code === 'too_big') {
        reason =
            'The data requested exceeds the maximum size ' +
                'that can be accessed with a single request.';
    }
    else if (code == 'permission_denied') {
        reason = "Client doesn't have permission to access the desired data.";
    }
    else if (code == 'unavailable') {
        reason = 'The service is unavailable';
    }
    const error = new Error(code + ' at ' + query.path.toString() + ': ' + reason);
    error.code = code.toUpperCase();
    return error;
};
/**
 * Used to test for integer-looking strings
 * @type {RegExp}
 * @private
 */
const INTEGER_REGEXP_ = new RegExp('^-?\\d{1,10}$');
/**
 * If the string contains a 32-bit integer, return it.  Else return null.
 * @param {!string} str
 * @return {?number}
 */
const tryParseInt = function (str) {
    if (INTEGER_REGEXP_.test(str)) {
        const intVal = Number(str);
        if (intVal >= -2147483648 && intVal <= 2147483647) {
            return intVal;
        }
    }
    return null;
};
/**
 * Helper to run some code but catch any exceptions and re-throw them later.
 * Useful for preventing user callbacks from breaking internal code.
 *
 * Re-throwing the exception from a setTimeout is a little evil, but it's very
 * convenient (we don't have to try to figure out when is a safe point to
 * re-throw it), and the behavior seems reasonable:
 *
 * * If you aren't pausing on exceptions, you get an error in the console with
 *   the correct stack trace.
 * * If you're pausing on all exceptions, the debugger will pause on your
 *   exception and then again when we rethrow it.
 * * If you're only pausing on uncaught exceptions, the debugger will only pause
 *   on us re-throwing it.
 *
 * @param {!function()} fn The code to guard.
 */
const exceptionGuard = function (fn) {
    try {
        fn();
    }
    catch (e) {
        // Re-throw exception when it's safe.
        setTimeout(function () {
            // It used to be that "throw e" would result in a good console error with
            // relevant context, but as of Chrome 39, you just get the firebase.js
            // file/line number where we re-throw it, which is useless. So we log
            // e.stack explicitly.
            const stack = e.stack || '';
            warn('Exception was thrown by user callback.', stack);
            throw e;
        }, Math.floor(0));
    }
};
/**
 * @return {boolean} true if we think we're currently being crawled.
 */
const beingCrawled = function () {
    const userAgent = (typeof window === 'object' &&
        window['navigator'] &&
        window['navigator']['userAgent']) ||
        '';
    // For now we whitelist the most popular crawlers.  We should refine this to be the set of crawlers we
    // believe to support JavaScript/AJAX rendering.
    // NOTE: Google Webmaster Tools doesn't really belong, but their "This is how a visitor to your website
    // would have seen the page" is flaky if we don't treat it as a crawler.
    return (userAgent.search(/googlebot|google webmaster tools|bingbot|yahoo! slurp|baiduspider|yandexbot|duckduckbot/i) >= 0);
};
/**
 * Same as setTimeout() except on Node.JS it will /not/ prevent the process from exiting.
 *
 * It is removed with clearTimeout() as normal.
 *
 * @param {Function} fn Function to run.
 * @param {number} time Milliseconds to wait before running.
 * @return {number|Object} The setTimeout() return value.
 */
const setTimeoutNonBlocking = function (fn, time) {
    const timeout = setTimeout(fn, time);
    if (typeof timeout === 'object' && timeout['unref']) {
        timeout['unref']();
    }
    return timeout;
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An immutable object representing a parsed path.  It's immutable so that you
 * can pass them around to other functions without worrying about them changing
 * it.
 */
class Path {
    /**
     * Singleton to represent an empty path
     *
     * @const
     */
    static get Empty() {
        return new Path('');
    }
    /**
     * @param {string|Array.<string>} pathOrString Path string to parse,
     *      or another path, or the raw tokens array
     * @param {number=} pieceNum
     */
    constructor(pathOrString, pieceNum) {
        if (pieceNum === void 0) {
            this.pieces_ = pathOrString.split('/');
            // Remove empty pieces.
            let copyTo = 0;
            for (let i = 0; i < this.pieces_.length; i++) {
                if (this.pieces_[i].length > 0) {
                    this.pieces_[copyTo] = this.pieces_[i];
                    copyTo++;
                }
            }
            this.pieces_.length = copyTo;
            this.pieceNum_ = 0;
        }
        else {
            this.pieces_ = pathOrString;
            this.pieceNum_ = pieceNum;
        }
    }
    getFront() {
        if (this.pieceNum_ >= this.pieces_.length)
            return null;
        return this.pieces_[this.pieceNum_];
    }
    /**
     * @return {number} The number of segments in this path
     */
    getLength() {
        return this.pieces_.length - this.pieceNum_;
    }
    /**
     * @return {!Path}
     */
    popFront() {
        let pieceNum = this.pieceNum_;
        if (pieceNum < this.pieces_.length) {
            pieceNum++;
        }
        return new Path(this.pieces_, pieceNum);
    }
    /**
     * @return {?string}
     */
    getBack() {
        if (this.pieceNum_ < this.pieces_.length)
            return this.pieces_[this.pieces_.length - 1];
        return null;
    }
    toString() {
        let pathString = '';
        for (let i = this.pieceNum_; i < this.pieces_.length; i++) {
            if (this.pieces_[i] !== '')
                pathString += '/' + this.pieces_[i];
        }
        return pathString || '/';
    }
    toUrlEncodedString() {
        let pathString = '';
        for (let i = this.pieceNum_; i < this.pieces_.length; i++) {
            if (this.pieces_[i] !== '')
                pathString += '/' + encodeURIComponent(String(this.pieces_[i]));
        }
        return pathString || '/';
    }
    /**
     * Shallow copy of the parts of the path.
     *
     * @param {number=} begin
     * @return {!Array<string>}
     */
    slice(begin = 0) {
        return this.pieces_.slice(this.pieceNum_ + begin);
    }
    /**
     * @return {?Path}
     */
    parent() {
        if (this.pieceNum_ >= this.pieces_.length)
            return null;
        const pieces = [];
        for (let i = this.pieceNum_; i < this.pieces_.length - 1; i++)
            pieces.push(this.pieces_[i]);
        return new Path(pieces, 0);
    }
    /**
     * @param {string|!Path} childPathObj
     * @return {!Path}
     */
    child(childPathObj) {
        const pieces = [];
        for (let i = this.pieceNum_; i < this.pieces_.length; i++)
            pieces.push(this.pieces_[i]);
        if (childPathObj instanceof Path) {
            for (let i = childPathObj.pieceNum_; i < childPathObj.pieces_.length; i++) {
                pieces.push(childPathObj.pieces_[i]);
            }
        }
        else {
            const childPieces = childPathObj.split('/');
            for (let i = 0; i < childPieces.length; i++) {
                if (childPieces[i].length > 0)
                    pieces.push(childPieces[i]);
            }
        }
        return new Path(pieces, 0);
    }
    /**
     * @return {boolean} True if there are no segments in this path
     */
    isEmpty() {
        return this.pieceNum_ >= this.pieces_.length;
    }
    /**
     * @param {!Path} outerPath
     * @param {!Path} innerPath
     * @return {!Path} The path from outerPath to innerPath
     */
    static relativePath(outerPath, innerPath) {
        const outer = outerPath.getFront(), inner = innerPath.getFront();
        if (outer === null) {
            return innerPath;
        }
        else if (outer === inner) {
            return Path.relativePath(outerPath.popFront(), innerPath.popFront());
        }
        else {
            throw new Error('INTERNAL ERROR: innerPath (' +
                innerPath +
                ') is not within ' +
                'outerPath (' +
                outerPath +
                ')');
        }
    }
    /**
     * @param {!Path} left
     * @param {!Path} right
     * @return {number} -1, 0, 1 if left is less, equal, or greater than the right.
     */
    static comparePaths(left, right) {
        const leftKeys = left.slice();
        const rightKeys = right.slice();
        for (let i = 0; i < leftKeys.length && i < rightKeys.length; i++) {
            const cmp = nameCompare(leftKeys[i], rightKeys[i]);
            if (cmp !== 0)
                return cmp;
        }
        if (leftKeys.length === rightKeys.length)
            return 0;
        return leftKeys.length < rightKeys.length ? -1 : 1;
    }
    /**
     *
     * @param {Path} other
     * @return {boolean} true if paths are the same.
     */
    equals(other) {
        if (this.getLength() !== other.getLength()) {
            return false;
        }
        for (let i = this.pieceNum_, j = other.pieceNum_; i <= this.pieces_.length; i++, j++) {
            if (this.pieces_[i] !== other.pieces_[j]) {
                return false;
            }
        }
        return true;
    }
    /**
     *
     * @param {!Path} other
     * @return {boolean} True if this path is a parent (or the same as) other
     */
    contains(other) {
        let i = this.pieceNum_;
        let j = other.pieceNum_;
        if (this.getLength() > other.getLength()) {
            return false;
        }
        while (i < this.pieces_.length) {
            if (this.pieces_[i] !== other.pieces_[j]) {
                return false;
            }
            ++i;
            ++j;
        }
        return true;
    }
} // end Path
/**
 * Dynamic (mutable) path used to count path lengths.
 *
 * This class is used to efficiently check paths for valid
 * length (in UTF8 bytes) and depth (used in path validation).
 *
 * Throws Error exception if path is ever invalid.
 *
 * The definition of a path always begins with '/'.
 */
class ValidationPath {
    /**
     * @param {!Path} path Initial Path.
     * @param {string} errorPrefix_ Prefix for any error messages.
     */
    constructor(path, errorPrefix_) {
        this.errorPrefix_ = errorPrefix_;
        /** @type {!Array<string>} */
        this.parts_ = path.slice();
        /** @type {number} Initialize to number of '/' chars needed in path. */
        this.byteLength_ = Math.max(1, this.parts_.length);
        for (let i = 0; i < this.parts_.length; i++) {
            this.byteLength_ += stringLength(this.parts_[i]);
        }
        this.checkValid_();
    }
    /** @const {number} Maximum key depth. */
    static get MAX_PATH_DEPTH() {
        return 32;
    }
    /** @const {number} Maximum number of (UTF8) bytes in a Firebase path. */
    static get MAX_PATH_LENGTH_BYTES() {
        return 768;
    }
    /** @param {string} child */
    push(child) {
        // Count the needed '/'
        if (this.parts_.length > 0) {
            this.byteLength_ += 1;
        }
        this.parts_.push(child);
        this.byteLength_ += stringLength(child);
        this.checkValid_();
    }
    pop() {
        const last = this.parts_.pop();
        this.byteLength_ -= stringLength(last);
        // Un-count the previous '/'
        if (this.parts_.length > 0) {
            this.byteLength_ -= 1;
        }
    }
    checkValid_() {
        if (this.byteLength_ > ValidationPath.MAX_PATH_LENGTH_BYTES) {
            throw new Error(this.errorPrefix_ +
                'has a key path longer than ' +
                ValidationPath.MAX_PATH_LENGTH_BYTES +
                ' bytes (' +
                this.byteLength_ +
                ').');
        }
        if (this.parts_.length > ValidationPath.MAX_PATH_DEPTH) {
            throw new Error(this.errorPrefix_ +
                'path specified exceeds the maximum depth that can be written (' +
                ValidationPath.MAX_PATH_DEPTH +
                ') or object contains a cycle ' +
                this.toErrorString());
        }
    }
    /**
     * String for use in error messages - uses '.' notation for path.
     *
     * @return {string}
     */
    toErrorString() {
        if (this.parts_.length == 0) {
            return '';
        }
        return "in property '" + this.parts_.join('.') + "'";
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const PROTOCOL_VERSION = '5';
const VERSION_PARAM = 'v';
const TRANSPORT_SESSION_PARAM = 's';
const REFERER_PARAM = 'r';
const FORGE_REF = 'f';
const FORGE_DOMAIN = 'firebaseio.com';
const LAST_SESSION_PARAM = 'ls';
const WEBSOCKET = 'websocket';
const LONG_POLLING = 'long_polling';

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A class that holds metadata about a Repo object
 *
 * @constructor
 */
class RepoInfo {
    /**
     * @param {string} host Hostname portion of the url for the repo
     * @param {boolean} secure Whether or not this repo is accessed over ssl
     * @param {string} namespace The namespace represented by the repo
     * @param {boolean} webSocketOnly Whether to prefer websockets over all other transports (used by Nest).
     * @param {string=} persistenceKey Override the default session persistence storage key
     */
    constructor(host, secure, namespace, webSocketOnly, persistenceKey = '') {
        this.secure = secure;
        this.namespace = namespace;
        this.webSocketOnly = webSocketOnly;
        this.persistenceKey = persistenceKey;
        this.host = host.toLowerCase();
        this.domain = this.host.substr(this.host.indexOf('.') + 1);
        this.internalHost = PersistentStorage.get('host:' + host) || this.host;
    }
    needsQueryParam() {
        return this.host !== this.internalHost || this.isCustomHost();
    }
    isCacheableHost() {
        return this.internalHost.substr(0, 2) === 's-';
    }
    isDemoHost() {
        return this.domain === 'firebaseio-demo.com';
    }
    isCustomHost() {
        return (this.domain !== 'firebaseio.com' && this.domain !== 'firebaseio-demo.com');
    }
    updateHost(newHost) {
        if (newHost !== this.internalHost) {
            this.internalHost = newHost;
            if (this.isCacheableHost()) {
                PersistentStorage.set('host:' + this.host, this.internalHost);
            }
        }
    }
    /**
     * Returns the websocket URL for this repo
     * @param {string} type of connection
     * @param {Object} params list
     * @return {string} The URL for this repo
     */
    connectionURL(type, params) {
        assert(typeof type === 'string', 'typeof type must == string');
        assert(typeof params === 'object', 'typeof params must == object');
        let connURL;
        if (type === WEBSOCKET) {
            connURL =
                (this.secure ? 'wss://' : 'ws://') + this.internalHost + '/.ws?';
        }
        else if (type === LONG_POLLING) {
            connURL =
                (this.secure ? 'https://' : 'http://') + this.internalHost + '/.lp?';
        }
        else {
            throw new Error('Unknown connection type: ' + type);
        }
        if (this.needsQueryParam()) {
            params['ns'] = this.namespace;
        }
        const pairs = [];
        forEach(params, (key, value) => {
            pairs.push(key + '=' + value);
        });
        return connURL + pairs.join('&');
    }
    /** @return {string} */
    toString() {
        let str = this.toURLString();
        if (this.persistenceKey) {
            str += '<' + this.persistenceKey + '>';
        }
        return str;
    }
    /** @return {string} */
    toURLString() {
        return (this.secure ? 'https://' : 'http://') + this.host;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @param {!string} pathString
 * @return {string}
 */
function decodePath(pathString) {
    let pathStringDecoded = '';
    const pieces = pathString.split('/');
    for (let i = 0; i < pieces.length; i++) {
        if (pieces[i].length > 0) {
            let piece = pieces[i];
            try {
                piece = decodeURIComponent(piece.replace(/\+/g, ' '));
            }
            catch (e) { }
            pathStringDecoded += '/' + piece;
        }
    }
    return pathStringDecoded;
}
/**
 * @param {!string} queryString
 * @return {!{[key:string]:string}} key value hash
 */
function decodeQuery(queryString) {
    let results = {};
    if (queryString.charAt(0) === '?') {
        queryString = queryString.substring(1);
    }
    for (const segment of queryString.split('&')) {
        if (segment.length === 0) {
            continue;
        }
        const kv = segment.split('=');
        if (kv.length === 2) {
            results[decodeURIComponent(kv[0])] = decodeURIComponent(kv[1]);
        }
        else {
            warn(`Invalid query segment '${segment}' in query '${queryString}'`);
        }
    }
    return results;
}
/**
 *
 * @param {!string} dataURL
 * @return {{repoInfo: !RepoInfo, path: !Path}}
 */
const parseRepoInfo = function (dataURL) {
    const parsedUrl = parseURL(dataURL), namespace = parsedUrl.subdomain;
    if (parsedUrl.domain === 'firebase') {
        fatal(parsedUrl.host +
            ' is no longer supported. ' +
            'Please use <YOUR FIREBASE>.firebaseio.com instead');
    }
    // Catch common error of uninitialized namespace value.
    if ((!namespace || namespace == 'undefined') &&
        parsedUrl.domain !== 'localhost') {
        fatal('Cannot parse Firebase url. Please use https://<YOUR FIREBASE>.firebaseio.com');
    }
    if (!parsedUrl.secure) {
        warnIfPageIsSecure();
    }
    const webSocketOnly = parsedUrl.scheme === 'ws' || parsedUrl.scheme === 'wss';
    return {
        repoInfo: new RepoInfo(parsedUrl.host, parsedUrl.secure, namespace, webSocketOnly),
        path: new Path(parsedUrl.pathString)
    };
};
/**
 *
 * @param {!string} dataURL
 * @return {{host: string, port: number, domain: string, subdomain: string, secure: boolean, scheme: string, pathString: string}}
 */
const parseURL = function (dataURL) {
    // Default to empty strings in the event of a malformed string.
    let host = '', domain = '', subdomain = '', pathString = '';
    // Always default to SSL, unless otherwise specified.
    let secure = true, scheme = 'https', port = 443;
    // Don't do any validation here. The caller is responsible for validating the result of parsing.
    if (typeof dataURL === 'string') {
        // Parse scheme.
        let colonInd = dataURL.indexOf('//');
        if (colonInd >= 0) {
            scheme = dataURL.substring(0, colonInd - 1);
            dataURL = dataURL.substring(colonInd + 2);
        }
        // Parse host, path, and query string.
        let slashInd = dataURL.indexOf('/');
        if (slashInd === -1) {
            slashInd = dataURL.length;
        }
        let questionMarkInd = dataURL.indexOf('?');
        if (questionMarkInd === -1) {
            questionMarkInd = dataURL.length;
        }
        host = dataURL.substring(0, Math.min(slashInd, questionMarkInd));
        if (slashInd < questionMarkInd) {
            // For pathString, questionMarkInd will always come after slashInd
            pathString = decodePath(dataURL.substring(slashInd, questionMarkInd));
        }
        let queryParams = decodeQuery(dataURL.substring(Math.min(dataURL.length, questionMarkInd)));
        // If we have a port, use scheme for determining if it's secure.
        colonInd = host.indexOf(':');
        if (colonInd >= 0) {
            secure = scheme === 'https' || scheme === 'wss';
            port = parseInt(host.substring(colonInd + 1), 10);
        }
        else {
            colonInd = dataURL.length;
        }
        const parts = host.split('.');
        if (parts.length === 3) {
            // Normalize namespaces to lowercase to share storage / connection.
            domain = parts[1];
            subdomain = parts[0].toLowerCase();
        }
        else if (parts.length === 2) {
            domain = parts[0];
        }
        else if (parts[0].slice(0, colonInd).toLowerCase() === 'localhost') {
            domain = 'localhost';
        }
        // Support `ns` query param if subdomain not already set
        if (subdomain === '' && 'ns' in queryParams) {
            subdomain = queryParams['ns'];
        }
    }
    return {
        host,
        port,
        domain,
        subdomain,
        secure,
        scheme,
        pathString
    };
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * True for invalid Firebase keys
 * @type {RegExp}
 * @private
 */
const INVALID_KEY_REGEX_ = /[\[\].#$\/\u0000-\u001F\u007F]/;
/**
 * True for invalid Firebase paths.
 * Allows '/' in paths.
 * @type {RegExp}
 * @private
 */
const INVALID_PATH_REGEX_ = /[\[\].#$\u0000-\u001F\u007F]/;
/**
 * Maximum number of characters to allow in leaf value
 * @type {number}
 * @private
 */
const MAX_LEAF_SIZE_ = 10 * 1024 * 1024;
/**
 * @param {*} key
 * @return {boolean}
 */
const isValidKey = function (key) {
    return (typeof key === 'string' && key.length !== 0 && !INVALID_KEY_REGEX_.test(key));
};
/**
 * @param {string} pathString
 * @return {boolean}
 */
const isValidPathString = function (pathString) {
    return (typeof pathString === 'string' &&
        pathString.length !== 0 &&
        !INVALID_PATH_REGEX_.test(pathString));
};
/**
 * @param {string} pathString
 * @return {boolean}
 */
const isValidRootPathString = function (pathString) {
    if (pathString) {
        // Allow '/.info/' at the beginning.
        pathString = pathString.replace(/^\/*\.info(\/|$)/, '/');
    }
    return isValidPathString(pathString);
};
/**
 * @param {*} priority
 * @return {boolean}
 */
const isValidPriority = function (priority) {
    return (priority === null ||
        typeof priority === 'string' ||
        (typeof priority === 'number' && !isInvalidJSONNumber(priority)) ||
        (priority && typeof priority === 'object' && contains(priority, '.sv')));
};
/**
 * Pre-validate a datum passed as an argument to Firebase function.
 *
 * @param {string} fnName
 * @param {number} argumentNumber
 * @param {*} data
 * @param {!Path} path
 * @param {boolean} optional
 */
const validateFirebaseDataArg = function (fnName, argumentNumber, data, path, optional) {
    if (optional && data === undefined)
        return;
    validateFirebaseData(errorPrefix(fnName, argumentNumber, optional), data, path);
};
/**
 * Validate a data object client-side before sending to server.
 *
 * @param {string} errorPrefix
 * @param {*} data
 * @param {!Path|!ValidationPath} path_
 */
const validateFirebaseData = function (errorPrefix, data, path_) {
    const path = path_ instanceof Path ? new ValidationPath(path_, errorPrefix) : path_;
    if (data === undefined) {
        throw new Error(errorPrefix + 'contains undefined ' + path.toErrorString());
    }
    if (typeof data === 'function') {
        throw new Error(errorPrefix +
            'contains a function ' +
            path.toErrorString() +
            ' with contents = ' +
            data.toString());
    }
    if (isInvalidJSONNumber(data)) {
        throw new Error(errorPrefix + 'contains ' + data.toString() + ' ' + path.toErrorString());
    }
    // Check max leaf size, but try to avoid the utf8 conversion if we can.
    if (typeof data === 'string' &&
        data.length > MAX_LEAF_SIZE_ / 3 &&
        stringLength(data) > MAX_LEAF_SIZE_) {
        throw new Error(errorPrefix +
            'contains a string greater than ' +
            MAX_LEAF_SIZE_ +
            ' utf8 bytes ' +
            path.toErrorString() +
            " ('" +
            data.substring(0, 50) +
            "...')");
    }
    // TODO = Perf = Consider combining the recursive validation of keys into NodeFromJSON
    // to save extra walking of large objects.
    if (data && typeof data === 'object') {
        let hasDotValue = false, hasActualChild = false;
        forEach(data, function (key, value) {
            if (key === '.value') {
                hasDotValue = true;
            }
            else if (key !== '.priority' && key !== '.sv') {
                hasActualChild = true;
                if (!isValidKey(key)) {
                    throw new Error(errorPrefix +
                        ' contains an invalid key (' +
                        key +
                        ') ' +
                        path.toErrorString() +
                        '.  Keys must be non-empty strings ' +
                        'and can\'t contain ".", "#", "$", "/", "[", or "]"');
                }
            }
            path.push(key);
            validateFirebaseData(errorPrefix, value, path);
            path.pop();
        });
        if (hasDotValue && hasActualChild) {
            throw new Error(errorPrefix +
                ' contains ".value" child ' +
                path.toErrorString() +
                ' in addition to actual children.');
        }
    }
};
/**
 * Pre-validate paths passed in the firebase function.
 *
 * @param {string} errorPrefix
 * @param {Array<!Path>} mergePaths
 */
const validateFirebaseMergePaths = function (errorPrefix, mergePaths) {
    let i, curPath;
    for (i = 0; i < mergePaths.length; i++) {
        curPath = mergePaths[i];
        const keys = curPath.slice();
        for (let j = 0; j < keys.length; j++) {
            if (keys[j] === '.priority' && j === keys.length - 1) ;
            else if (!isValidKey(keys[j])) {
                throw new Error(errorPrefix +
                    'contains an invalid key (' +
                    keys[j] +
                    ') in path ' +
                    curPath.toString() +
                    '. Keys must be non-empty strings ' +
                    'and can\'t contain ".", "#", "$", "/", "[", or "]"');
            }
        }
    }
    // Check that update keys are not descendants of each other.
    // We rely on the property that sorting guarantees that ancestors come
    // right before descendants.
    mergePaths.sort(Path.comparePaths);
    let prevPath = null;
    for (i = 0; i < mergePaths.length; i++) {
        curPath = mergePaths[i];
        if (prevPath !== null && prevPath.contains(curPath)) {
            throw new Error(errorPrefix +
                'contains a path ' +
                prevPath.toString() +
                ' that is ancestor of another path ' +
                curPath.toString());
        }
        prevPath = curPath;
    }
};
/**
 * pre-validate an object passed as an argument to firebase function (
 * must be an object - e.g. for firebase.update()).
 *
 * @param {string} fnName
 * @param {number} argumentNumber
 * @param {*} data
 * @param {!Path} path
 * @param {boolean} optional
 */
const validateFirebaseMergeDataArg = function (fnName, argumentNumber, data, path, optional) {
    if (optional && data === undefined)
        return;
    const errorPrefix$1 = errorPrefix(fnName, argumentNumber, optional);
    if (!(data && typeof data === 'object') || Array.isArray(data)) {
        throw new Error(errorPrefix$1 + ' must be an object containing the children to replace.');
    }
    const mergePaths = [];
    forEach(data, function (key, value) {
        const curPath = new Path(key);
        validateFirebaseData(errorPrefix$1, value, path.child(curPath));
        if (curPath.getBack() === '.priority') {
            if (!isValidPriority(value)) {
                throw new Error(errorPrefix$1 +
                    "contains an invalid value for '" +
                    curPath.toString() +
                    "', which must be a valid " +
                    'Firebase priority (a string, finite number, server value, or null).');
            }
        }
        mergePaths.push(curPath);
    });
    validateFirebaseMergePaths(errorPrefix$1, mergePaths);
};
const validatePriority = function (fnName, argumentNumber, priority, optional) {
    if (optional && priority === undefined)
        return;
    if (isInvalidJSONNumber(priority))
        throw new Error(errorPrefix(fnName, argumentNumber, optional) +
            'is ' +
            priority.toString() +
            ', but must be a valid Firebase priority (a string, finite number, ' +
            'server value, or null).');
    // Special case to allow importing data with a .sv.
    if (!isValidPriority(priority))
        throw new Error(errorPrefix(fnName, argumentNumber, optional) +
            'must be a valid Firebase priority ' +
            '(a string, finite number, server value, or null).');
};
const validateEventType = function (fnName, argumentNumber, eventType, optional) {
    if (optional && eventType === undefined)
        return;
    switch (eventType) {
        case 'value':
        case 'child_added':
        case 'child_removed':
        case 'child_changed':
        case 'child_moved':
            break;
        default:
            throw new Error(errorPrefix(fnName, argumentNumber, optional) +
                'must be a valid event type = "value", "child_added", "child_removed", ' +
                '"child_changed", or "child_moved".');
    }
};
const validateKey = function (fnName, argumentNumber, key, optional) {
    if (optional && key === undefined)
        return;
    if (!isValidKey(key))
        throw new Error(errorPrefix(fnName, argumentNumber, optional) +
            'was an invalid key = "' +
            key +
            '".  Firebase keys must be non-empty strings and ' +
            'can\'t contain ".", "#", "$", "/", "[", or "]").');
};
const validatePathString = function (fnName, argumentNumber, pathString, optional) {
    if (optional && pathString === undefined)
        return;
    if (!isValidPathString(pathString))
        throw new Error(errorPrefix(fnName, argumentNumber, optional) +
            'was an invalid path = "' +
            pathString +
            '". Paths must be non-empty strings and ' +
            'can\'t contain ".", "#", "$", "[", or "]"');
};
const validateRootPathString = function (fnName, argumentNumber, pathString, optional) {
    if (pathString) {
        // Allow '/.info/' at the beginning.
        pathString = pathString.replace(/^\/*\.info(\/|$)/, '/');
    }
    validatePathString(fnName, argumentNumber, pathString, optional);
};
const validateWritablePath = function (fnName, path) {
    if (path.getFront() === '.info') {
        throw new Error(fnName + " failed = Can't modify data under /.info/");
    }
};
const validateUrl = function (fnName, argumentNumber, parsedUrl) {
    // TODO = Validate server better.
    const pathString = parsedUrl.path.toString();
    if (!(typeof parsedUrl.repoInfo.host === 'string') ||
        parsedUrl.repoInfo.host.length === 0 ||
        (!isValidKey(parsedUrl.repoInfo.namespace) &&
            parsedUrl.repoInfo.host.split(':')[0] !== 'localhost') ||
        (pathString.length !== 0 && !isValidRootPathString(pathString))) {
        throw new Error(errorPrefix(fnName, argumentNumber, false) +
            'must be a valid firebase URL and ' +
            'the path can\'t contain ".", "#", "$", "[", or "]".');
    }
};
const validateBoolean = function (fnName, argumentNumber, bool, optional) {
    if (optional && bool === undefined)
        return;
    if (typeof bool !== 'boolean')
        throw new Error(errorPrefix(fnName, argumentNumber, optional) + 'must be a boolean.');
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @constructor
 */
class OnDisconnect {
    /**
     * @param {!Repo} repo_
     * @param {!Path} path_
     */
    constructor(repo_, path_) {
        this.repo_ = repo_;
        this.path_ = path_;
    }
    /**
     * @param {function(?Error)=} onComplete
     * @return {!firebase.Promise}
     */
    cancel(onComplete) {
        validateArgCount('OnDisconnect.cancel', 0, 1, arguments.length);
        validateCallback('OnDisconnect.cancel', 1, onComplete, true);
        const deferred = new Deferred();
        this.repo_.onDisconnectCancel(this.path_, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {function(?Error)=} onComplete
     * @return {!firebase.Promise}
     */
    remove(onComplete) {
        validateArgCount('OnDisconnect.remove', 0, 1, arguments.length);
        validateWritablePath('OnDisconnect.remove', this.path_);
        validateCallback('OnDisconnect.remove', 1, onComplete, true);
        const deferred = new Deferred();
        this.repo_.onDisconnectSet(this.path_, null, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {*} value
     * @param {function(?Error)=} onComplete
     * @return {!firebase.Promise}
     */
    set(value, onComplete) {
        validateArgCount('OnDisconnect.set', 1, 2, arguments.length);
        validateWritablePath('OnDisconnect.set', this.path_);
        validateFirebaseDataArg('OnDisconnect.set', 1, value, this.path_, false);
        validateCallback('OnDisconnect.set', 2, onComplete, true);
        const deferred = new Deferred();
        this.repo_.onDisconnectSet(this.path_, value, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {*} value
     * @param {number|string|null} priority
     * @param {function(?Error)=} onComplete
     * @return {!firebase.Promise}
     */
    setWithPriority(value, priority, onComplete) {
        validateArgCount('OnDisconnect.setWithPriority', 2, 3, arguments.length);
        validateWritablePath('OnDisconnect.setWithPriority', this.path_);
        validateFirebaseDataArg('OnDisconnect.setWithPriority', 1, value, this.path_, false);
        validatePriority('OnDisconnect.setWithPriority', 2, priority, false);
        validateCallback('OnDisconnect.setWithPriority', 3, onComplete, true);
        const deferred = new Deferred();
        this.repo_.onDisconnectSetWithPriority(this.path_, value, priority, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {!Object} objectToMerge
     * @param {function(?Error)=} onComplete
     * @return {!firebase.Promise}
     */
    update(objectToMerge, onComplete) {
        validateArgCount('OnDisconnect.update', 1, 2, arguments.length);
        validateWritablePath('OnDisconnect.update', this.path_);
        if (Array.isArray(objectToMerge)) {
            const newObjectToMerge = {};
            for (let i = 0; i < objectToMerge.length; ++i) {
                newObjectToMerge['' + i] = objectToMerge[i];
            }
            objectToMerge = newObjectToMerge;
            warn('Passing an Array to firebase.database.onDisconnect().update() is deprecated. Use set() if you want to overwrite the ' +
                'existing data, or an Object with integer keys if you really do want to only update some of the children.');
        }
        validateFirebaseMergeDataArg('OnDisconnect.update', 1, objectToMerge, this.path_, false);
        validateCallback('OnDisconnect.update', 2, onComplete, true);
        const deferred = new Deferred();
        this.repo_.onDisconnectUpdate(this.path_, objectToMerge, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
class TransactionResult {
    /**
     * A type for the resolve value of Firebase.transaction.
     * @constructor
     * @dict
     * @param {boolean} committed
     * @param {DataSnapshot} snapshot
     */
    constructor(committed, snapshot) {
        this.committed = committed;
        this.snapshot = snapshot;
    }
    // Do not create public documentation. This is intended to make JSON serialization work but is otherwise unnecessary
    // for end-users
    toJSON() {
        validateArgCount('TransactionResult.toJSON', 0, 1, arguments.length);
        return { committed: this.committed, snapshot: this.snapshot.toJSON() };
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Fancy ID generator that creates 20-character string identifiers with the
 * following properties:
 *
 * 1. They're based on timestamp so that they sort *after* any existing ids.
 * 2. They contain 72-bits of random data after the timestamp so that IDs won't
 *    collide with other clients' IDs.
 * 3. They sort *lexicographically* (so the timestamp is converted to characters
 *    that will sort properly).
 * 4. They're monotonically increasing. Even if you generate more than one in
 *    the same timestamp, the latter ones will sort after the former ones. We do
 *    this by using the previous random bits but "incrementing" them by 1 (only
 *    in the case of a timestamp collision).
 */
const nextPushId = (function () {
    // Modeled after base64 web-safe chars, but ordered by ASCII.
    const PUSH_CHARS = '-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';
    // Timestamp of last push, used to prevent local collisions if you push twice
    // in one ms.
    let lastPushTime = 0;
    // We generate 72-bits of randomness which get turned into 12 characters and
    // appended to the timestamp to prevent collisions with other clients. We
    // store the last characters we generated because in the event of a collision,
    // we'll use those same characters except "incremented" by one.
    const lastRandChars = [];
    return function (now) {
        const duplicateTime = now === lastPushTime;
        lastPushTime = now;
        let i;
        const timeStampChars = new Array(8);
        for (i = 7; i >= 0; i--) {
            timeStampChars[i] = PUSH_CHARS.charAt(now % 64);
            // NOTE: Can't use << here because javascript will convert to int and lose
            // the upper bits.
            now = Math.floor(now / 64);
        }
        assert(now === 0, 'Cannot push at time == 0');
        let id = timeStampChars.join('');
        if (!duplicateTime) {
            for (i = 0; i < 12; i++) {
                lastRandChars[i] = Math.floor(Math.random() * 64);
            }
        }
        else {
            // If the timestamp hasn't changed since last push, use the same random
            // number, except incremented by 1.
            for (i = 11; i >= 0 && lastRandChars[i] === 63; i--) {
                lastRandChars[i] = 0;
            }
            lastRandChars[i]++;
        }
        for (i = 0; i < 12; i++) {
            id += PUSH_CHARS.charAt(lastRandChars[i]);
        }
        assert(id.length === 20, 'nextPushId: Length should be 20.');
        return id;
    };
})();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 *
 * @param {!string} name
 * @param {!Node} node
 * @constructor
 * @struct
 */
class NamedNode {
    constructor(name, node) {
        this.name = name;
        this.node = node;
    }
    /**
     *
     * @param {!string} name
     * @param {!Node} node
     * @return {NamedNode}
     */
    static Wrap(name, node) {
        return new NamedNode(name, node);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 *
 * @constructor
 */
class Index {
    /**
     * @return {function(!NamedNode, !NamedNode):number} A standalone comparison function for
     * this index
     */
    getCompare() {
        return this.compare.bind(this);
    }
    /**
     * Given a before and after value for a node, determine if the indexed value has changed. Even if they are different,
     * it's possible that the changes are isolated to parts of the snapshot that are not indexed.
     *
     * @param {!Node} oldNode
     * @param {!Node} newNode
     * @return {boolean} True if the portion of the snapshot being indexed changed between oldNode and newNode
     */
    indexedValueChanged(oldNode, newNode) {
        const oldWrapped = new NamedNode(MIN_NAME, oldNode);
        const newWrapped = new NamedNode(MIN_NAME, newNode);
        return this.compare(oldWrapped, newWrapped) !== 0;
    }
    /**
     * @return {!NamedNode} a node wrapper that will sort equal to or less than
     * any other node wrapper, using this index
     */
    minPost() {
        return NamedNode.MIN;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let __EMPTY_NODE;
class KeyIndex extends Index {
    static get __EMPTY_NODE() {
        return __EMPTY_NODE;
    }
    static set __EMPTY_NODE(val) {
        __EMPTY_NODE = val;
    }
    /**
     * @inheritDoc
     */
    compare(a, b) {
        return nameCompare(a.name, b.name);
    }
    /**
     * @inheritDoc
     */
    isDefinedOn(node) {
        // We could probably return true here (since every node has a key), but it's never called
        // so just leaving unimplemented for now.
        throw assertionError('KeyIndex.isDefinedOn not expected to be called.');
    }
    /**
     * @inheritDoc
     */
    indexedValueChanged(oldNode, newNode) {
        return false; // The key for a node never changes.
    }
    /**
     * @inheritDoc
     */
    minPost() {
        return NamedNode.MIN;
    }
    /**
     * @inheritDoc
     */
    maxPost() {
        // TODO: This should really be created once and cached in a static property, but
        // NamedNode isn't defined yet, so I can't use it in a static.  Bleh.
        return new NamedNode(MAX_NAME, __EMPTY_NODE);
    }
    /**
     * @param {*} indexValue
     * @param {string} name
     * @return {!NamedNode}
     */
    makePost(indexValue, name) {
        assert(typeof indexValue === 'string', 'KeyIndex indexValue must always be a string.');
        // We just use empty node, but it'll never be compared, since our comparator only looks at name.
        return new NamedNode(indexValue, __EMPTY_NODE);
    }
    /**
     * @return {!string} String representation for inclusion in a query spec
     */
    toString() {
        return '.key';
    }
}
const KEY_INDEX = new KeyIndex();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let MAX_NODE;
function setMaxNode(val) {
    MAX_NODE = val;
}
/**
 * @param {(!string|!number)} priority
 * @return {!string}
 */
const priorityHashText = function (priority) {
    if (typeof priority === 'number')
        return 'number:' + doubleToIEEE754String(priority);
    else
        return 'string:' + priority;
};
/**
 * Validates that a priority snapshot Node is valid.
 *
 * @param {!Node} priorityNode
 */
const validatePriorityNode = function (priorityNode) {
    if (priorityNode.isLeafNode()) {
        const val = priorityNode.val();
        assert(typeof val === 'string' ||
            typeof val === 'number' ||
            (typeof val === 'object' && contains(val, '.sv')), 'Priority must be a string or number.');
    }
    else {
        assert(priorityNode === MAX_NODE || priorityNode.isEmpty(), 'priority of unexpected type.');
    }
    // Don't call getPriority() on MAX_NODE to avoid hitting assertion.
    assert(priorityNode === MAX_NODE || priorityNode.getPriority().isEmpty(), "Priority nodes can't have a priority of their own.");
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let __childrenNodeConstructor;
/**
 * LeafNode is a class for storing leaf nodes in a DataSnapshot.  It
 * implements Node and stores the value of the node (a string,
 * number, or boolean) accessible via getValue().
 */
class LeafNode {
    /**
     * @implements {Node}
     * @param {!(string|number|boolean|Object)} value_ The value to store in this leaf node.
     *                                         The object type is possible in the event of a deferred value
     * @param {!Node=} priorityNode_ The priority of this node.
     */
    constructor(value_, priorityNode_ = LeafNode.__childrenNodeConstructor.EMPTY_NODE) {
        this.value_ = value_;
        this.priorityNode_ = priorityNode_;
        this.lazyHash_ = null;
        assert(this.value_ !== undefined && this.value_ !== null, "LeafNode shouldn't be created with null/undefined value.");
        validatePriorityNode(this.priorityNode_);
    }
    static set __childrenNodeConstructor(val) {
        __childrenNodeConstructor = val;
    }
    static get __childrenNodeConstructor() {
        return __childrenNodeConstructor;
    }
    /** @inheritDoc */
    isLeafNode() {
        return true;
    }
    /** @inheritDoc */
    getPriority() {
        return this.priorityNode_;
    }
    /** @inheritDoc */
    updatePriority(newPriorityNode) {
        return new LeafNode(this.value_, newPriorityNode);
    }
    /** @inheritDoc */
    getImmediateChild(childName) {
        // Hack to treat priority as a regular child
        if (childName === '.priority') {
            return this.priorityNode_;
        }
        else {
            return LeafNode.__childrenNodeConstructor.EMPTY_NODE;
        }
    }
    /** @inheritDoc */
    getChild(path) {
        if (path.isEmpty()) {
            return this;
        }
        else if (path.getFront() === '.priority') {
            return this.priorityNode_;
        }
        else {
            return LeafNode.__childrenNodeConstructor.EMPTY_NODE;
        }
    }
    /**
     * @inheritDoc
     */
    hasChild() {
        return false;
    }
    /** @inheritDoc */
    getPredecessorChildName(childName, childNode) {
        return null;
    }
    /** @inheritDoc */
    updateImmediateChild(childName, newChildNode) {
        if (childName === '.priority') {
            return this.updatePriority(newChildNode);
        }
        else if (newChildNode.isEmpty() && childName !== '.priority') {
            return this;
        }
        else {
            return LeafNode.__childrenNodeConstructor.EMPTY_NODE.updateImmediateChild(childName, newChildNode).updatePriority(this.priorityNode_);
        }
    }
    /** @inheritDoc */
    updateChild(path, newChildNode) {
        const front = path.getFront();
        if (front === null) {
            return newChildNode;
        }
        else if (newChildNode.isEmpty() && front !== '.priority') {
            return this;
        }
        else {
            assert(front !== '.priority' || path.getLength() === 1, '.priority must be the last token in a path');
            return this.updateImmediateChild(front, LeafNode.__childrenNodeConstructor.EMPTY_NODE.updateChild(path.popFront(), newChildNode));
        }
    }
    /** @inheritDoc */
    isEmpty() {
        return false;
    }
    /** @inheritDoc */
    numChildren() {
        return 0;
    }
    /** @inheritDoc */
    forEachChild(index, action) {
        return false;
    }
    /**
     * @inheritDoc
     */
    val(exportFormat) {
        if (exportFormat && !this.getPriority().isEmpty())
            return {
                '.value': this.getValue(),
                '.priority': this.getPriority().val()
            };
        else
            return this.getValue();
    }
    /** @inheritDoc */
    hash() {
        if (this.lazyHash_ === null) {
            let toHash = '';
            if (!this.priorityNode_.isEmpty())
                toHash +=
                    'priority:' +
                        priorityHashText(this.priorityNode_.val()) +
                        ':';
            const type = typeof this.value_;
            toHash += type + ':';
            if (type === 'number') {
                toHash += doubleToIEEE754String(this.value_);
            }
            else {
                toHash += this.value_;
            }
            this.lazyHash_ = sha1(toHash);
        }
        return this.lazyHash_;
    }
    /**
     * Returns the value of the leaf node.
     * @return {Object|string|number|boolean} The value of the node.
     */
    getValue() {
        return this.value_;
    }
    /**
     * @inheritDoc
     */
    compareTo(other) {
        if (other === LeafNode.__childrenNodeConstructor.EMPTY_NODE) {
            return 1;
        }
        else if (other instanceof LeafNode.__childrenNodeConstructor) {
            return -1;
        }
        else {
            assert(other.isLeafNode(), 'Unknown node type');
            return this.compareToLeafNode_(other);
        }
    }
    /**
     * Comparison specifically for two leaf nodes
     * @param {!LeafNode} otherLeaf
     * @return {!number}
     * @private
     */
    compareToLeafNode_(otherLeaf) {
        const otherLeafType = typeof otherLeaf.value_;
        const thisLeafType = typeof this.value_;
        const otherIndex = LeafNode.VALUE_TYPE_ORDER.indexOf(otherLeafType);
        const thisIndex = LeafNode.VALUE_TYPE_ORDER.indexOf(thisLeafType);
        assert(otherIndex >= 0, 'Unknown leaf type: ' + otherLeafType);
        assert(thisIndex >= 0, 'Unknown leaf type: ' + thisLeafType);
        if (otherIndex === thisIndex) {
            // Same type, compare values
            if (thisLeafType === 'object') {
                // Deferred value nodes are all equal, but we should also never get to this point...
                return 0;
            }
            else {
                // Note that this works because true > false, all others are number or string comparisons
                if (this.value_ < otherLeaf.value_) {
                    return -1;
                }
                else if (this.value_ === otherLeaf.value_) {
                    return 0;
                }
                else {
                    return 1;
                }
            }
        }
        else {
            return thisIndex - otherIndex;
        }
    }
    /**
     * @inheritDoc
     */
    withIndex() {
        return this;
    }
    /**
     * @inheritDoc
     */
    isIndexed() {
        return true;
    }
    /**
     * @inheritDoc
     */
    equals(other) {
        /**
         * @inheritDoc
         */
        if (other === this) {
            return true;
        }
        else if (other.isLeafNode()) {
            const otherLeaf = other;
            return (this.value_ === otherLeaf.value_ &&
                this.priorityNode_.equals(otherLeaf.priorityNode_));
        }
        else {
            return false;
        }
    }
}
/**
 * The sort order for comparing leaf nodes of different types. If two leaf nodes have
 * the same type, the comparison falls back to their value
 * @type {Array.<!string>}
 * @const
 */
LeafNode.VALUE_TYPE_ORDER = ['object', 'boolean', 'number', 'string'];

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let nodeFromJSON;
let MAX_NODE$1;
function setNodeFromJSON(val) {
    nodeFromJSON = val;
}
function setMaxNode$1(val) {
    MAX_NODE$1 = val;
}
/**
 * @constructor
 * @extends {Index}
 * @private
 */
class PriorityIndex extends Index {
    /**
     * @inheritDoc
     */
    compare(a, b) {
        const aPriority = a.node.getPriority();
        const bPriority = b.node.getPriority();
        const indexCmp = aPriority.compareTo(bPriority);
        if (indexCmp === 0) {
            return nameCompare(a.name, b.name);
        }
        else {
            return indexCmp;
        }
    }
    /**
     * @inheritDoc
     */
    isDefinedOn(node) {
        return !node.getPriority().isEmpty();
    }
    /**
     * @inheritDoc
     */
    indexedValueChanged(oldNode, newNode) {
        return !oldNode.getPriority().equals(newNode.getPriority());
    }
    /**
     * @inheritDoc
     */
    minPost() {
        return NamedNode.MIN;
    }
    /**
     * @inheritDoc
     */
    maxPost() {
        return new NamedNode(MAX_NAME, new LeafNode('[PRIORITY-POST]', MAX_NODE$1));
    }
    /**
     * @param {*} indexValue
     * @param {string} name
     * @return {!NamedNode}
     */
    makePost(indexValue, name) {
        const priorityNode = nodeFromJSON(indexValue);
        return new NamedNode(name, new LeafNode('[PRIORITY-POST]', priorityNode));
    }
    /**
     * @return {!string} String representation for inclusion in a query spec
     */
    toString() {
        return '.priority';
    }
}
const PRIORITY_INDEX = new PriorityIndex();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An iterator over an LLRBNode.
 */
class SortedMapIterator {
    /**
     * @template K, V, T
     * @param {LLRBNode|LLRBEmptyNode} node Node to iterate.
     * @param {?K} startKey
     * @param {function(K, K): number} comparator
     * @param {boolean} isReverse_ Whether or not to iterate in reverse
     * @param {(function(K, V):T)=} resultGenerator_
     */
    constructor(node, startKey, comparator, isReverse_, resultGenerator_ = null) {
        this.isReverse_ = isReverse_;
        this.resultGenerator_ = resultGenerator_;
        /** @private
         * @type {Array.<!LLRBNode>}
         */
        this.nodeStack_ = [];
        let cmp = 1;
        while (!node.isEmpty()) {
            node = node;
            cmp = startKey ? comparator(node.key, startKey) : 1;
            // flip the comparison if we're going in reverse
            if (isReverse_)
                cmp *= -1;
            if (cmp < 0) {
                // This node is less than our start key. ignore it
                if (this.isReverse_) {
                    node = node.left;
                }
                else {
                    node = node.right;
                }
            }
            else if (cmp === 0) {
                // This node is exactly equal to our start key. Push it on the stack, but stop iterating;
                this.nodeStack_.push(node);
                break;
            }
            else {
                // This node is greater than our start key, add it to the stack and move to the next one
                this.nodeStack_.push(node);
                if (this.isReverse_) {
                    node = node.right;
                }
                else {
                    node = node.left;
                }
            }
        }
    }
    getNext() {
        if (this.nodeStack_.length === 0)
            return null;
        let node = this.nodeStack_.pop();
        let result;
        if (this.resultGenerator_)
            result = this.resultGenerator_(node.key, node.value);
        else
            result = { key: node.key, value: node.value };
        if (this.isReverse_) {
            node = node.left;
            while (!node.isEmpty()) {
                this.nodeStack_.push(node);
                node = node.right;
            }
        }
        else {
            node = node.right;
            while (!node.isEmpty()) {
                this.nodeStack_.push(node);
                node = node.left;
            }
        }
        return result;
    }
    hasNext() {
        return this.nodeStack_.length > 0;
    }
    peek() {
        if (this.nodeStack_.length === 0)
            return null;
        const node = this.nodeStack_[this.nodeStack_.length - 1];
        if (this.resultGenerator_) {
            return this.resultGenerator_(node.key, node.value);
        }
        else {
            return { key: node.key, value: node.value };
        }
    }
}
/**
 * Represents a node in a Left-leaning Red-Black tree.
 */
class LLRBNode {
    /**
     * @template K, V
     * @param {!K} key Key associated with this node.
     * @param {!V} value Value associated with this node.
     * @param {?boolean} color Whether this node is red.
     * @param {?(LLRBNode|LLRBEmptyNode)=} left Left child.
     * @param {?(LLRBNode|LLRBEmptyNode)=} right Right child.
     */
    constructor(key, value, color, left, right) {
        this.key = key;
        this.value = value;
        this.color = color != null ? color : LLRBNode.RED;
        this.left =
            left != null ? left : SortedMap.EMPTY_NODE;
        this.right =
            right != null ? right : SortedMap.EMPTY_NODE;
    }
    /**
     * Returns a copy of the current node, optionally replacing pieces of it.
     *
     * @param {?K} key New key for the node, or null.
     * @param {?V} value New value for the node, or null.
     * @param {?boolean} color New color for the node, or null.
     * @param {?LLRBNode|LLRBEmptyNode} left New left child for the node, or null.
     * @param {?LLRBNode|LLRBEmptyNode} right New right child for the node, or null.
     * @return {!LLRBNode} The node copy.
     */
    copy(key, value, color, left, right) {
        return new LLRBNode(key != null ? key : this.key, value != null ? value : this.value, color != null ? color : this.color, left != null ? left : this.left, right != null ? right : this.right);
    }
    /**
     * @return {number} The total number of nodes in the tree.
     */
    count() {
        return this.left.count() + 1 + this.right.count();
    }
    /**
     * @return {boolean} True if the tree is empty.
     */
    isEmpty() {
        return false;
    }
    /**
     * Traverses the tree in key order and calls the specified action function
     * for each node.
     *
     * @param {function(!K, !V):*} action Callback function to be called for each
     *   node.  If it returns true, traversal is aborted.
     * @return {*} The first truthy value returned by action, or the last falsey
     *   value returned by action
     */
    inorderTraversal(action) {
        return (this.left.inorderTraversal(action) ||
            action(this.key, this.value) ||
            this.right.inorderTraversal(action));
    }
    /**
     * Traverses the tree in reverse key order and calls the specified action function
     * for each node.
     *
     * @param {function(!Object, !Object)} action Callback function to be called for each
     * node.  If it returns true, traversal is aborted.
     * @return {*} True if traversal was aborted.
     */
    reverseTraversal(action) {
        return (this.right.reverseTraversal(action) ||
            action(this.key, this.value) ||
            this.left.reverseTraversal(action));
    }
    /**
     * @return {!Object} The minimum node in the tree.
     * @private
     */
    min_() {
        if (this.left.isEmpty()) {
            return this;
        }
        else {
            return this.left.min_();
        }
    }
    /**
     * @return {!K} The maximum key in the tree.
     */
    minKey() {
        return this.min_().key;
    }
    /**
     * @return {!K} The maximum key in the tree.
     */
    maxKey() {
        if (this.right.isEmpty()) {
            return this.key;
        }
        else {
            return this.right.maxKey();
        }
    }
    /**
     *
     * @param {!Object} key Key to insert.
     * @param {!Object} value Value to insert.
     * @param {Comparator} comparator Comparator.
     * @return {!LLRBNode} New tree, with the key/value added.
     */
    insert(key, value, comparator) {
        let cmp, n;
        n = this;
        cmp = comparator(key, n.key);
        if (cmp < 0) {
            n = n.copy(null, null, null, n.left.insert(key, value, comparator), null);
        }
        else if (cmp === 0) {
            n = n.copy(null, value, null, null, null);
        }
        else {
            n = n.copy(null, null, null, null, n.right.insert(key, value, comparator));
        }
        return n.fixUp_();
    }
    /**
     * @private
     * @return {!LLRBNode|LLRBEmptyNode} New tree, with the minimum key removed.
     */
    removeMin_() {
        if (this.left.isEmpty()) {
            return SortedMap.EMPTY_NODE;
        }
        let n = this;
        if (!n.left.isRed_() && !n.left.left.isRed_())
            n = n.moveRedLeft_();
        n = n.copy(null, null, null, n.left.removeMin_(), null);
        return n.fixUp_();
    }
    /**
     * @param {!Object} key The key of the item to remove.
     * @param {Comparator} comparator Comparator.
     * @return {!LLRBNode|LLRBEmptyNode} New tree, with the specified item removed.
     */
    remove(key, comparator) {
        let n, smallest;
        n = this;
        if (comparator(key, n.key) < 0) {
            if (!n.left.isEmpty() && !n.left.isRed_() && !n.left.left.isRed_()) {
                n = n.moveRedLeft_();
            }
            n = n.copy(null, null, null, n.left.remove(key, comparator), null);
        }
        else {
            if (n.left.isRed_())
                n = n.rotateRight_();
            if (!n.right.isEmpty() && !n.right.isRed_() && !n.right.left.isRed_()) {
                n = n.moveRedRight_();
            }
            if (comparator(key, n.key) === 0) {
                if (n.right.isEmpty()) {
                    return SortedMap.EMPTY_NODE;
                }
                else {
                    smallest = n.right.min_();
                    n = n.copy(smallest.key, smallest.value, null, null, n.right.removeMin_());
                }
            }
            n = n.copy(null, null, null, null, n.right.remove(key, comparator));
        }
        return n.fixUp_();
    }
    /**
     * @private
     * @return {boolean} Whether this is a RED node.
     */
    isRed_() {
        return this.color;
    }
    /**
     * @private
     * @return {!LLRBNode} New tree after performing any needed rotations.
     */
    fixUp_() {
        let n = this;
        if (n.right.isRed_() && !n.left.isRed_())
            n = n.rotateLeft_();
        if (n.left.isRed_() && n.left.left.isRed_())
            n = n.rotateRight_();
        if (n.left.isRed_() && n.right.isRed_())
            n = n.colorFlip_();
        return n;
    }
    /**
     * @private
     * @return {!LLRBNode} New tree, after moveRedLeft.
     */
    moveRedLeft_() {
        let n = this.colorFlip_();
        if (n.right.left.isRed_()) {
            n = n.copy(null, null, null, null, n.right.rotateRight_());
            n = n.rotateLeft_();
            n = n.colorFlip_();
        }
        return n;
    }
    /**
     * @private
     * @return {!LLRBNode} New tree, after moveRedRight.
     */
    moveRedRight_() {
        let n = this.colorFlip_();
        if (n.left.left.isRed_()) {
            n = n.rotateRight_();
            n = n.colorFlip_();
        }
        return n;
    }
    /**
     * @private
     * @return {!LLRBNode} New tree, after rotateLeft.
     */
    rotateLeft_() {
        const nl = this.copy(null, null, LLRBNode.RED, null, this.right.left);
        return this.right.copy(null, null, this.color, nl, null);
    }
    /**
     * @private
     * @return {!LLRBNode} New tree, after rotateRight.
     */
    rotateRight_() {
        const nr = this.copy(null, null, LLRBNode.RED, this.left.right, null);
        return this.left.copy(null, null, this.color, null, nr);
    }
    /**
     * @private
     * @return {!LLRBNode} New tree, after colorFlip.
     */
    colorFlip_() {
        const left = this.left.copy(null, null, !this.left.color, null, null);
        const right = this.right.copy(null, null, !this.right.color, null, null);
        return this.copy(null, null, !this.color, left, right);
    }
    /**
     * For testing.
     *
     * @private
     * @return {boolean} True if all is well.
     */
    checkMaxDepth_() {
        const blackDepth = this.check_();
        return Math.pow(2.0, blackDepth) <= this.count() + 1;
    }
    /**
     * @private
     * @return {number} Not sure what this returns exactly. :-).
     */
    check_() {
        let blackDepth;
        if (this.isRed_() && this.left.isRed_()) {
            throw new Error('Red node has red child(' + this.key + ',' + this.value + ')');
        }
        if (this.right.isRed_()) {
            throw new Error('Right child of (' + this.key + ',' + this.value + ') is red');
        }
        blackDepth = this.left.check_();
        if (blackDepth !== this.right.check_()) {
            throw new Error('Black depths differ');
        }
        else {
            return blackDepth + (this.isRed_() ? 0 : 1);
        }
    }
}
LLRBNode.RED = true;
LLRBNode.BLACK = false;
/**
 * Represents an empty node (a leaf node in the Red-Black Tree).
 */
class LLRBEmptyNode {
    /**
     * Returns a copy of the current node.
     *
     * @return {!LLRBEmptyNode} The node copy.
     */
    copy(key, value, color, left, right) {
        return this;
    }
    /**
     * Returns a copy of the tree, with the specified key/value added.
     *
     * @param {!K} key Key to be added.
     * @param {!V} value Value to be added.
     * @param {Comparator} comparator Comparator.
     * @return {!LLRBNode} New tree, with item added.
     */
    insert(key, value, comparator) {
        return new LLRBNode(key, value, null);
    }
    /**
     * Returns a copy of the tree, with the specified key removed.
     *
     * @param {!K} key The key to remove.
     * @param {Comparator} comparator Comparator.
     * @return {!LLRBEmptyNode} New tree, with item removed.
     */
    remove(key, comparator) {
        return this;
    }
    /**
     * @return {number} The total number of nodes in the tree.
     */
    count() {
        return 0;
    }
    /**
     * @return {boolean} True if the tree is empty.
     */
    isEmpty() {
        return true;
    }
    /**
     * Traverses the tree in key order and calls the specified action function
     * for each node.
     *
     * @param {function(!K, !V):*} action Callback function to be called for each
     * node.  If it returns true, traversal is aborted.
     * @return {boolean} True if traversal was aborted.
     */
    inorderTraversal(action) {
        return false;
    }
    /**
     * Traverses the tree in reverse key order and calls the specified action function
     * for each node.
     *
     * @param {function(!K, !V)} action Callback function to be called for each
     * node.  If it returns true, traversal is aborted.
     * @return {boolean} True if traversal was aborted.
     */
    reverseTraversal(action) {
        return false;
    }
    /**
     * @return {null}
     */
    minKey() {
        return null;
    }
    /**
     * @return {null}
     */
    maxKey() {
        return null;
    }
    /**
     * @private
     * @return {number} Not sure what this returns exactly. :-).
     */
    check_() {
        return 0;
    }
    /**
     * @private
     * @return {boolean} Whether this node is red.
     */
    isRed_() {
        return false;
    }
}
/**
 * An immutable sorted map implementation, based on a Left-leaning Red-Black
 * tree.
 */
class SortedMap {
    /**
     * @template K, V
     * @param {function(K, K):number} comparator_ Key comparator.
     * @param {LLRBNode=} root_ (Optional) Root node for the map.
     */
    constructor(comparator_, root_ = SortedMap.EMPTY_NODE) {
        this.comparator_ = comparator_;
        this.root_ = root_;
    }
    /**
     * Returns a copy of the map, with the specified key/value added or replaced.
     * (TODO: We should perhaps rename this method to 'put')
     *
     * @param {!K} key Key to be added.
     * @param {!V} value Value to be added.
     * @return {!SortedMap.<K, V>} New map, with item added.
     */
    insert(key, value) {
        return new SortedMap(this.comparator_, this.root_
            .insert(key, value, this.comparator_)
            .copy(null, null, LLRBNode.BLACK, null, null));
    }
    /**
     * Returns a copy of the map, with the specified key removed.
     *
     * @param {!K} key The key to remove.
     * @return {!SortedMap.<K, V>} New map, with item removed.
     */
    remove(key) {
        return new SortedMap(this.comparator_, this.root_
            .remove(key, this.comparator_)
            .copy(null, null, LLRBNode.BLACK, null, null));
    }
    /**
     * Returns the value of the node with the given key, or null.
     *
     * @param {!K} key The key to look up.
     * @return {?V} The value of the node with the given key, or null if the
     * key doesn't exist.
     */
    get(key) {
        let cmp;
        let node = this.root_;
        while (!node.isEmpty()) {
            cmp = this.comparator_(key, node.key);
            if (cmp === 0) {
                return node.value;
            }
            else if (cmp < 0) {
                node = node.left;
            }
            else if (cmp > 0) {
                node = node.right;
            }
        }
        return null;
    }
    /**
     * Returns the key of the item *before* the specified key, or null if key is the first item.
     * @param {K} key The key to find the predecessor of
     * @return {?K} The predecessor key.
     */
    getPredecessorKey(key) {
        let cmp, node = this.root_, rightParent = null;
        while (!node.isEmpty()) {
            cmp = this.comparator_(key, node.key);
            if (cmp === 0) {
                if (!node.left.isEmpty()) {
                    node = node.left;
                    while (!node.right.isEmpty())
                        node = node.right;
                    return node.key;
                }
                else if (rightParent) {
                    return rightParent.key;
                }
                else {
                    return null; // first item.
                }
            }
            else if (cmp < 0) {
                node = node.left;
            }
            else if (cmp > 0) {
                rightParent = node;
                node = node.right;
            }
        }
        throw new Error('Attempted to find predecessor key for a nonexistent key.  What gives?');
    }
    /**
     * @return {boolean} True if the map is empty.
     */
    isEmpty() {
        return this.root_.isEmpty();
    }
    /**
     * @return {number} The total number of nodes in the map.
     */
    count() {
        return this.root_.count();
    }
    /**
     * @return {?K} The minimum key in the map.
     */
    minKey() {
        return this.root_.minKey();
    }
    /**
     * @return {?K} The maximum key in the map.
     */
    maxKey() {
        return this.root_.maxKey();
    }
    /**
     * Traverses the map in key order and calls the specified action function
     * for each key/value pair.
     *
     * @param {function(!K, !V):*} action Callback function to be called
     * for each key/value pair.  If action returns true, traversal is aborted.
     * @return {*} The first truthy value returned by action, or the last falsey
     *   value returned by action
     */
    inorderTraversal(action) {
        return this.root_.inorderTraversal(action);
    }
    /**
     * Traverses the map in reverse key order and calls the specified action function
     * for each key/value pair.
     *
     * @param {function(!Object, !Object)} action Callback function to be called
     * for each key/value pair.  If action returns true, traversal is aborted.
     * @return {*} True if the traversal was aborted.
     */
    reverseTraversal(action) {
        return this.root_.reverseTraversal(action);
    }
    /**
     * Returns an iterator over the SortedMap.
     * @template T
     * @param {(function(K, V):T)=} resultGenerator
     * @return {SortedMapIterator.<K, V, T>} The iterator.
     */
    getIterator(resultGenerator) {
        return new SortedMapIterator(this.root_, null, this.comparator_, false, resultGenerator);
    }
    getIteratorFrom(key, resultGenerator) {
        return new SortedMapIterator(this.root_, key, this.comparator_, false, resultGenerator);
    }
    getReverseIteratorFrom(key, resultGenerator) {
        return new SortedMapIterator(this.root_, key, this.comparator_, true, resultGenerator);
    }
    getReverseIterator(resultGenerator) {
        return new SortedMapIterator(this.root_, null, this.comparator_, true, resultGenerator);
    }
}
/**
 * Always use the same empty node, to reduce memory.
 * @const
 */
SortedMap.EMPTY_NODE = new LLRBEmptyNode();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const LOG_2 = Math.log(2);
/**
 * @constructor
 */
class Base12Num {
    /**
     * @param {number} length
     */
    constructor(length) {
        const logBase2 = (num) => parseInt((Math.log(num) / LOG_2), 10);
        const bitMask = (bits) => parseInt(Array(bits + 1).join('1'), 2);
        this.count = logBase2(length + 1);
        this.current_ = this.count - 1;
        const mask = bitMask(this.count);
        this.bits_ = (length + 1) & mask;
    }
    /**
     * @return {boolean}
     */
    nextBitIsOne() {
        //noinspection JSBitwiseOperatorUsage
        const result = !(this.bits_ & (0x1 << this.current_));
        this.current_--;
        return result;
    }
}
/**
 * Takes a list of child nodes and constructs a SortedSet using the given comparison
 * function
 *
 * Uses the algorithm described in the paper linked here:
 * http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.46.1458
 *
 * @template K, V
 * @param {Array.<!NamedNode>} childList Unsorted list of children
 * @param {function(!NamedNode, !NamedNode):number} cmp The comparison method to be used
 * @param {(function(NamedNode):K)=} keyFn An optional function to extract K from a node wrapper, if K's
 *                                                        type is not NamedNode
 * @param {(function(K, K):number)=} mapSortFn An optional override for comparator used by the generated sorted map
 * @return {SortedMap.<K, V>}
 */
const buildChildSet = function (childList, cmp, keyFn, mapSortFn) {
    childList.sort(cmp);
    const buildBalancedTree = function (low, high) {
        const length = high - low;
        let namedNode;
        let key;
        if (length == 0) {
            return null;
        }
        else if (length == 1) {
            namedNode = childList[low];
            key = keyFn ? keyFn(namedNode) : namedNode;
            return new LLRBNode(key, namedNode.node, LLRBNode.BLACK, null, null);
        }
        else {
            const middle = parseInt((length / 2), 10) + low;
            const left = buildBalancedTree(low, middle);
            const right = buildBalancedTree(middle + 1, high);
            namedNode = childList[middle];
            key = keyFn ? keyFn(namedNode) : namedNode;
            return new LLRBNode(key, namedNode.node, LLRBNode.BLACK, left, right);
        }
    };
    const buildFrom12Array = function (base12) {
        let node = null;
        let root = null;
        let index = childList.length;
        const buildPennant = function (chunkSize, color) {
            const low = index - chunkSize;
            const high = index;
            index -= chunkSize;
            const childTree = buildBalancedTree(low + 1, high);
            const namedNode = childList[low];
            const key = keyFn ? keyFn(namedNode) : namedNode;
            attachPennant(new LLRBNode(key, namedNode.node, color, null, childTree));
        };
        const attachPennant = function (pennant) {
            if (node) {
                node.left = pennant;
                node = pennant;
            }
            else {
                root = pennant;
                node = pennant;
            }
        };
        for (let i = 0; i < base12.count; ++i) {
            const isOne = base12.nextBitIsOne();
            // The number of nodes taken in each slice is 2^(arr.length - (i + 1))
            const chunkSize = Math.pow(2, base12.count - (i + 1));
            if (isOne) {
                buildPennant(chunkSize, LLRBNode.BLACK);
            }
            else {
                // current == 2
                buildPennant(chunkSize, LLRBNode.BLACK);
                buildPennant(chunkSize, LLRBNode.RED);
            }
        }
        return root;
    };
    const base12 = new Base12Num(childList.length);
    const root = buildFrom12Array(base12);
    return new SortedMap(mapSortFn || cmp, root);
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let _defaultIndexMap;
const fallbackObject = {};
/**
 *
 * @param {Object.<string, FallbackType|SortedMap.<NamedNode, Node>>} indexes
 * @param {Object.<string, Index>} indexSet
 * @constructor
 */
class IndexMap {
    constructor(indexes_, indexSet_) {
        this.indexes_ = indexes_;
        this.indexSet_ = indexSet_;
    }
    /**
     * The default IndexMap for nodes without a priority
     * @type {!IndexMap}
     * @const
     */
    static get Default() {
        assert(fallbackObject && PRIORITY_INDEX, 'ChildrenNode.ts has not been loaded');
        _defaultIndexMap =
            _defaultIndexMap ||
                new IndexMap({ '.priority': fallbackObject }, { '.priority': PRIORITY_INDEX });
        return _defaultIndexMap;
    }
    /**
     *
     * @param {!string} indexKey
     * @return {?SortedMap.<NamedNode, Node>}
     */
    get(indexKey) {
        const sortedMap = safeGet(this.indexes_, indexKey);
        if (!sortedMap)
            throw new Error('No index defined for ' + indexKey);
        if (sortedMap === fallbackObject) {
            // The index exists, but it falls back to just name comparison. Return null so that the calling code uses the
            // regular child map
            return null;
        }
        else {
            return sortedMap;
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {boolean}
     */
    hasIndex(indexDefinition) {
        return contains(this.indexSet_, indexDefinition.toString());
    }
    /**
     * @param {!Index} indexDefinition
     * @param {!SortedMap.<string, !Node>} existingChildren
     * @return {!IndexMap}
     */
    addIndex(indexDefinition, existingChildren) {
        assert(indexDefinition !== KEY_INDEX, "KeyIndex always exists and isn't meant to be added to the IndexMap.");
        const childList = [];
        let sawIndexedValue = false;
        const iter = existingChildren.getIterator(NamedNode.Wrap);
        let next = iter.getNext();
        while (next) {
            sawIndexedValue =
                sawIndexedValue || indexDefinition.isDefinedOn(next.node);
            childList.push(next);
            next = iter.getNext();
        }
        let newIndex;
        if (sawIndexedValue) {
            newIndex = buildChildSet(childList, indexDefinition.getCompare());
        }
        else {
            newIndex = fallbackObject;
        }
        const indexName = indexDefinition.toString();
        const newIndexSet = clone(this.indexSet_);
        newIndexSet[indexName] = indexDefinition;
        const newIndexes = clone(this.indexes_);
        newIndexes[indexName] = newIndex;
        return new IndexMap(newIndexes, newIndexSet);
    }
    /**
     * Ensure that this node is properly tracked in any indexes that we're maintaining
     * @param {!NamedNode} namedNode
     * @param {!SortedMap.<string, !Node>} existingChildren
     * @return {!IndexMap}
     */
    addToIndexes(namedNode, existingChildren) {
        const newIndexes = map(this.indexes_, (indexedChildren, indexName) => {
            const index = safeGet(this.indexSet_, indexName);
            assert(index, 'Missing index implementation for ' + indexName);
            if (indexedChildren === fallbackObject) {
                // Check to see if we need to index everything
                if (index.isDefinedOn(namedNode.node)) {
                    // We need to build this index
                    const childList = [];
                    const iter = existingChildren.getIterator(NamedNode.Wrap);
                    let next = iter.getNext();
                    while (next) {
                        if (next.name != namedNode.name) {
                            childList.push(next);
                        }
                        next = iter.getNext();
                    }
                    childList.push(namedNode);
                    return buildChildSet(childList, index.getCompare());
                }
                else {
                    // No change, this remains a fallback
                    return fallbackObject;
                }
            }
            else {
                const existingSnap = existingChildren.get(namedNode.name);
                let newChildren = indexedChildren;
                if (existingSnap) {
                    newChildren = newChildren.remove(new NamedNode(namedNode.name, existingSnap));
                }
                return newChildren.insert(namedNode, namedNode.node);
            }
        });
        return new IndexMap(newIndexes, this.indexSet_);
    }
    /**
     * Create a new IndexMap instance with the given value removed
     * @param {!NamedNode} namedNode
     * @param {!SortedMap.<string, !Node>} existingChildren
     * @return {!IndexMap}
     */
    removeFromIndexes(namedNode, existingChildren) {
        const newIndexes = map(this.indexes_, function (indexedChildren) {
            if (indexedChildren === fallbackObject) {
                // This is the fallback. Just return it, nothing to do in this case
                return indexedChildren;
            }
            else {
                const existingSnap = existingChildren.get(namedNode.name);
                if (existingSnap) {
                    return indexedChildren.remove(new NamedNode(namedNode.name, existingSnap));
                }
                else {
                    // No record of this child
                    return indexedChildren;
                }
            }
        });
        return new IndexMap(newIndexes, this.indexSet_);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
function NAME_ONLY_COMPARATOR(left, right) {
    return nameCompare(left.name, right.name);
}
function NAME_COMPARATOR(left, right) {
    return nameCompare(left, right);
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// TODO: For memory savings, don't store priorityNode_ if it's empty.
let EMPTY_NODE;
/**
 * ChildrenNode is a class for storing internal nodes in a DataSnapshot
 * (i.e. nodes with children).  It implements Node and stores the
 * list of children in the children property, sorted by child name.
 *
 * @constructor
 * @implements {Node}
 */
class ChildrenNode {
    /**
     *
     * @param {!SortedMap.<string, !Node>} children_ List of children
     * of this node..
     * @param {?Node} priorityNode_ The priority of this node (as a snapshot node).
     * @param {!IndexMap} indexMap_
     */
    constructor(children_, priorityNode_, indexMap_) {
        this.children_ = children_;
        this.priorityNode_ = priorityNode_;
        this.indexMap_ = indexMap_;
        this.lazyHash_ = null;
        /**
         * Note: The only reason we allow null priority is for EMPTY_NODE, since we can't use
         * EMPTY_NODE as the priority of EMPTY_NODE.  We might want to consider making EMPTY_NODE its own
         * class instead of an empty ChildrenNode.
         */
        if (this.priorityNode_) {
            validatePriorityNode(this.priorityNode_);
        }
        if (this.children_.isEmpty()) {
            assert(!this.priorityNode_ || this.priorityNode_.isEmpty(), 'An empty node cannot have a priority');
        }
    }
    static get EMPTY_NODE() {
        return (EMPTY_NODE ||
            (EMPTY_NODE = new ChildrenNode(new SortedMap(NAME_COMPARATOR), null, IndexMap.Default)));
    }
    /** @inheritDoc */
    isLeafNode() {
        return false;
    }
    /** @inheritDoc */
    getPriority() {
        return this.priorityNode_ || EMPTY_NODE;
    }
    /** @inheritDoc */
    updatePriority(newPriorityNode) {
        if (this.children_.isEmpty()) {
            // Don't allow priorities on empty nodes
            return this;
        }
        else {
            return new ChildrenNode(this.children_, newPriorityNode, this.indexMap_);
        }
    }
    /** @inheritDoc */
    getImmediateChild(childName) {
        // Hack to treat priority as a regular child
        if (childName === '.priority') {
            return this.getPriority();
        }
        else {
            const child = this.children_.get(childName);
            return child === null ? EMPTY_NODE : child;
        }
    }
    /** @inheritDoc */
    getChild(path) {
        const front = path.getFront();
        if (front === null)
            return this;
        return this.getImmediateChild(front).getChild(path.popFront());
    }
    /** @inheritDoc */
    hasChild(childName) {
        return this.children_.get(childName) !== null;
    }
    /** @inheritDoc */
    updateImmediateChild(childName, newChildNode) {
        assert(newChildNode, 'We should always be passing snapshot nodes');
        if (childName === '.priority') {
            return this.updatePriority(newChildNode);
        }
        else {
            const namedNode = new NamedNode(childName, newChildNode);
            let newChildren, newIndexMap, newPriority;
            if (newChildNode.isEmpty()) {
                newChildren = this.children_.remove(childName);
                newIndexMap = this.indexMap_.removeFromIndexes(namedNode, this.children_);
            }
            else {
                newChildren = this.children_.insert(childName, newChildNode);
                newIndexMap = this.indexMap_.addToIndexes(namedNode, this.children_);
            }
            newPriority = newChildren.isEmpty() ? EMPTY_NODE : this.priorityNode_;
            return new ChildrenNode(newChildren, newPriority, newIndexMap);
        }
    }
    /** @inheritDoc */
    updateChild(path, newChildNode) {
        const front = path.getFront();
        if (front === null) {
            return newChildNode;
        }
        else {
            assert(path.getFront() !== '.priority' || path.getLength() === 1, '.priority must be the last token in a path');
            const newImmediateChild = this.getImmediateChild(front).updateChild(path.popFront(), newChildNode);
            return this.updateImmediateChild(front, newImmediateChild);
        }
    }
    /** @inheritDoc */
    isEmpty() {
        return this.children_.isEmpty();
    }
    /** @inheritDoc */
    numChildren() {
        return this.children_.count();
    }
    /** @inheritDoc */
    val(exportFormat) {
        if (this.isEmpty())
            return null;
        const obj = {};
        let numKeys = 0, maxKey = 0, allIntegerKeys = true;
        this.forEachChild(PRIORITY_INDEX, function (key, childNode) {
            obj[key] = childNode.val(exportFormat);
            numKeys++;
            if (allIntegerKeys && ChildrenNode.INTEGER_REGEXP_.test(key)) {
                maxKey = Math.max(maxKey, Number(key));
            }
            else {
                allIntegerKeys = false;
            }
        });
        if (!exportFormat && allIntegerKeys && maxKey < 2 * numKeys) {
            // convert to array.
            const array = [];
            for (let key in obj)
                array[key] = obj[key];
            return array;
        }
        else {
            if (exportFormat && !this.getPriority().isEmpty()) {
                obj['.priority'] = this.getPriority().val();
            }
            return obj;
        }
    }
    /** @inheritDoc */
    hash() {
        if (this.lazyHash_ === null) {
            let toHash = '';
            if (!this.getPriority().isEmpty())
                toHash +=
                    'priority:' +
                        priorityHashText(this.getPriority().val()) +
                        ':';
            this.forEachChild(PRIORITY_INDEX, function (key, childNode) {
                const childHash = childNode.hash();
                if (childHash !== '')
                    toHash += ':' + key + ':' + childHash;
            });
            this.lazyHash_ = toHash === '' ? '' : sha1(toHash);
        }
        return this.lazyHash_;
    }
    /** @inheritDoc */
    getPredecessorChildName(childName, childNode, index) {
        const idx = this.resolveIndex_(index);
        if (idx) {
            const predecessor = idx.getPredecessorKey(new NamedNode(childName, childNode));
            return predecessor ? predecessor.name : null;
        }
        else {
            return this.children_.getPredecessorKey(childName);
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {?string}
     */
    getFirstChildName(indexDefinition) {
        const idx = this.resolveIndex_(indexDefinition);
        if (idx) {
            const minKey = idx.minKey();
            return minKey && minKey.name;
        }
        else {
            return this.children_.minKey();
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {?NamedNode}
     */
    getFirstChild(indexDefinition) {
        const minKey = this.getFirstChildName(indexDefinition);
        if (minKey) {
            return new NamedNode(minKey, this.children_.get(minKey));
        }
        else {
            return null;
        }
    }
    /**
     * Given an index, return the key name of the largest value we have, according to that index
     * @param {!Index} indexDefinition
     * @return {?string}
     */
    getLastChildName(indexDefinition) {
        const idx = this.resolveIndex_(indexDefinition);
        if (idx) {
            const maxKey = idx.maxKey();
            return maxKey && maxKey.name;
        }
        else {
            return this.children_.maxKey();
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {?NamedNode}
     */
    getLastChild(indexDefinition) {
        const maxKey = this.getLastChildName(indexDefinition);
        if (maxKey) {
            return new NamedNode(maxKey, this.children_.get(maxKey));
        }
        else {
            return null;
        }
    }
    /**
     * @inheritDoc
     */
    forEachChild(index, action) {
        const idx = this.resolveIndex_(index);
        if (idx) {
            return idx.inorderTraversal(function (wrappedNode) {
                return action(wrappedNode.name, wrappedNode.node);
            });
        }
        else {
            return this.children_.inorderTraversal(action);
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {SortedMapIterator}
     */
    getIterator(indexDefinition) {
        return this.getIteratorFrom(indexDefinition.minPost(), indexDefinition);
    }
    /**
     *
     * @param {!NamedNode} startPost
     * @param {!Index} indexDefinition
     * @return {!SortedMapIterator}
     */
    getIteratorFrom(startPost, indexDefinition) {
        const idx = this.resolveIndex_(indexDefinition);
        if (idx) {
            return idx.getIteratorFrom(startPost, key => key);
        }
        else {
            const iterator = this.children_.getIteratorFrom(startPost.name, NamedNode.Wrap);
            let next = iterator.peek();
            while (next != null && indexDefinition.compare(next, startPost) < 0) {
                iterator.getNext();
                next = iterator.peek();
            }
            return iterator;
        }
    }
    /**
     * @param {!Index} indexDefinition
     * @return {!SortedMapIterator}
     */
    getReverseIterator(indexDefinition) {
        return this.getReverseIteratorFrom(indexDefinition.maxPost(), indexDefinition);
    }
    /**
     * @param {!NamedNode} endPost
     * @param {!Index} indexDefinition
     * @return {!SortedMapIterator}
     */
    getReverseIteratorFrom(endPost, indexDefinition) {
        const idx = this.resolveIndex_(indexDefinition);
        if (idx) {
            return idx.getReverseIteratorFrom(endPost, function (key) {
                return key;
            });
        }
        else {
            const iterator = this.children_.getReverseIteratorFrom(endPost.name, NamedNode.Wrap);
            let next = iterator.peek();
            while (next != null && indexDefinition.compare(next, endPost) > 0) {
                iterator.getNext();
                next = iterator.peek();
            }
            return iterator;
        }
    }
    /**
     * @inheritDoc
     */
    compareTo(other) {
        if (this.isEmpty()) {
            if (other.isEmpty()) {
                return 0;
            }
            else {
                return -1;
            }
        }
        else if (other.isLeafNode() || other.isEmpty()) {
            return 1;
        }
        else if (other === MAX_NODE$2) {
            return -1;
        }
        else {
            // Must be another node with children.
            return 0;
        }
    }
    /**
     * @inheritDoc
     */
    withIndex(indexDefinition) {
        if (indexDefinition === KEY_INDEX ||
            this.indexMap_.hasIndex(indexDefinition)) {
            return this;
        }
        else {
            const newIndexMap = this.indexMap_.addIndex(indexDefinition, this.children_);
            return new ChildrenNode(this.children_, this.priorityNode_, newIndexMap);
        }
    }
    /**
     * @inheritDoc
     */
    isIndexed(index) {
        return index === KEY_INDEX || this.indexMap_.hasIndex(index);
    }
    /**
     * @inheritDoc
     */
    equals(other) {
        if (other === this) {
            return true;
        }
        else if (other.isLeafNode()) {
            return false;
        }
        else {
            const otherChildrenNode = other;
            if (!this.getPriority().equals(otherChildrenNode.getPriority())) {
                return false;
            }
            else if (this.children_.count() === otherChildrenNode.children_.count()) {
                const thisIter = this.getIterator(PRIORITY_INDEX);
                const otherIter = otherChildrenNode.getIterator(PRIORITY_INDEX);
                let thisCurrent = thisIter.getNext();
                let otherCurrent = otherIter.getNext();
                while (thisCurrent && otherCurrent) {
                    if (thisCurrent.name !== otherCurrent.name ||
                        !thisCurrent.node.equals(otherCurrent.node)) {
                        return false;
                    }
                    thisCurrent = thisIter.getNext();
                    otherCurrent = otherIter.getNext();
                }
                return thisCurrent === null && otherCurrent === null;
            }
            else {
                return false;
            }
        }
    }
    /**
     * Returns a SortedMap ordered by index, or null if the default (by-key) ordering can be used
     * instead.
     *
     * @private
     * @param {!Index} indexDefinition
     * @return {?SortedMap.<NamedNode, Node>}
     */
    resolveIndex_(indexDefinition) {
        if (indexDefinition === KEY_INDEX) {
            return null;
        }
        else {
            return this.indexMap_.get(indexDefinition.toString());
        }
    }
}
/**
 * @private
 * @type {RegExp}
 */
ChildrenNode.INTEGER_REGEXP_ = /^(0|[1-9]\d*)$/;
/**
 * @constructor
 * @extends {ChildrenNode}
 * @private
 */
class MaxNode extends ChildrenNode {
    constructor() {
        super(new SortedMap(NAME_COMPARATOR), ChildrenNode.EMPTY_NODE, IndexMap.Default);
    }
    compareTo(other) {
        if (other === this) {
            return 0;
        }
        else {
            return 1;
        }
    }
    equals(other) {
        // Not that we every compare it, but MAX_NODE is only ever equal to itself
        return other === this;
    }
    getPriority() {
        return this;
    }
    getImmediateChild(childName) {
        return ChildrenNode.EMPTY_NODE;
    }
    isEmpty() {
        return false;
    }
}
/**
 * Marker that will sort higher than any other snapshot.
 * @type {!MAX_NODE}
 * @const
 */
const MAX_NODE$2 = new MaxNode();
Object.defineProperties(NamedNode, {
    MIN: {
        value: new NamedNode(MIN_NAME, ChildrenNode.EMPTY_NODE)
    },
    MAX: {
        value: new NamedNode(MAX_NAME, MAX_NODE$2)
    }
});
/**
 * Reference Extensions
 */
KeyIndex.__EMPTY_NODE = ChildrenNode.EMPTY_NODE;
LeafNode.__childrenNodeConstructor = ChildrenNode;
setMaxNode(MAX_NODE$2);
setMaxNode$1(MAX_NODE$2);

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const USE_HINZE = true;
/**
 * Constructs a snapshot node representing the passed JSON and returns it.
 * @param {*} json JSON to create a node for.
 * @param {?string|?number=} priority Optional priority to use.  This will be ignored if the
 * passed JSON contains a .priority property.
 * @return {!Node}
 */
function nodeFromJSON$1(json, priority = null) {
    if (json === null) {
        return ChildrenNode.EMPTY_NODE;
    }
    if (typeof json === 'object' && '.priority' in json) {
        priority = json['.priority'];
    }
    assert(priority === null ||
        typeof priority === 'string' ||
        typeof priority === 'number' ||
        (typeof priority === 'object' && '.sv' in priority), 'Invalid priority type found: ' + typeof priority);
    if (typeof json === 'object' && '.value' in json && json['.value'] !== null) {
        json = json['.value'];
    }
    // Valid leaf nodes include non-objects or server-value wrapper objects
    if (typeof json !== 'object' || '.sv' in json) {
        const jsonLeaf = json;
        return new LeafNode(jsonLeaf, nodeFromJSON$1(priority));
    }
    if (!(json instanceof Array) && USE_HINZE) {
        const children = [];
        let childrenHavePriority = false;
        const hinzeJsonObj = json;
        forEach(hinzeJsonObj, (key, child) => {
            if (typeof key !== 'string' || key.substring(0, 1) !== '.') {
                // Ignore metadata nodes
                const childNode = nodeFromJSON$1(hinzeJsonObj[key]);
                if (!childNode.isEmpty()) {
                    childrenHavePriority =
                        childrenHavePriority || !childNode.getPriority().isEmpty();
                    children.push(new NamedNode(key, childNode));
                }
            }
        });
        if (children.length == 0) {
            return ChildrenNode.EMPTY_NODE;
        }
        const childSet = buildChildSet(children, NAME_ONLY_COMPARATOR, namedNode => namedNode.name, NAME_COMPARATOR);
        if (childrenHavePriority) {
            const sortedChildSet = buildChildSet(children, PRIORITY_INDEX.getCompare());
            return new ChildrenNode(childSet, nodeFromJSON$1(priority), new IndexMap({ '.priority': sortedChildSet }, { '.priority': PRIORITY_INDEX }));
        }
        else {
            return new ChildrenNode(childSet, nodeFromJSON$1(priority), IndexMap.Default);
        }
    }
    else {
        let node = ChildrenNode.EMPTY_NODE;
        const jsonObj = json;
        forEach(jsonObj, (key, childData) => {
            if (contains(jsonObj, key)) {
                if (key.substring(0, 1) !== '.') {
                    // ignore metadata nodes.
                    const childNode = nodeFromJSON$1(childData);
                    if (childNode.isLeafNode() || !childNode.isEmpty())
                        node = node.updateImmediateChild(key, childNode);
                }
            }
        });
        return node.updatePriority(nodeFromJSON$1(priority));
    }
}
setNodeFromJSON(nodeFromJSON$1);

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @constructor
 * @extends {Index}
 * @private
 */
class ValueIndex extends Index {
    /**
     * @inheritDoc
     */
    compare(a, b) {
        const indexCmp = a.node.compareTo(b.node);
        if (indexCmp === 0) {
            return nameCompare(a.name, b.name);
        }
        else {
            return indexCmp;
        }
    }
    /**
     * @inheritDoc
     */
    isDefinedOn(node) {
        return true;
    }
    /**
     * @inheritDoc
     */
    indexedValueChanged(oldNode, newNode) {
        return !oldNode.equals(newNode);
    }
    /**
     * @inheritDoc
     */
    minPost() {
        return NamedNode.MIN;
    }
    /**
     * @inheritDoc
     */
    maxPost() {
        return NamedNode.MAX;
    }
    /**
     * @param {*} indexValue
     * @param {string} name
     * @return {!NamedNode}
     */
    makePost(indexValue, name) {
        const valueNode = nodeFromJSON$1(indexValue);
        return new NamedNode(name, valueNode);
    }
    /**
     * @return {!string} String representation for inclusion in a query spec
     */
    toString() {
        return '.value';
    }
}
const VALUE_INDEX = new ValueIndex();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @param {!Path} indexPath
 * @constructor
 * @extends {Index}
 */
class PathIndex extends Index {
    constructor(indexPath_) {
        super();
        this.indexPath_ = indexPath_;
        assert(!indexPath_.isEmpty() && indexPath_.getFront() !== '.priority', "Can't create PathIndex with empty path or .priority key");
    }
    /**
     * @param {!Node} snap
     * @return {!Node}
     * @protected
     */
    extractChild(snap) {
        return snap.getChild(this.indexPath_);
    }
    /**
     * @inheritDoc
     */
    isDefinedOn(node) {
        return !node.getChild(this.indexPath_).isEmpty();
    }
    /**
     * @inheritDoc
     */
    compare(a, b) {
        const aChild = this.extractChild(a.node);
        const bChild = this.extractChild(b.node);
        const indexCmp = aChild.compareTo(bChild);
        if (indexCmp === 0) {
            return nameCompare(a.name, b.name);
        }
        else {
            return indexCmp;
        }
    }
    /**
     * @inheritDoc
     */
    makePost(indexValue, name) {
        const valueNode = nodeFromJSON$1(indexValue);
        const node = ChildrenNode.EMPTY_NODE.updateChild(this.indexPath_, valueNode);
        return new NamedNode(name, node);
    }
    /**
     * @inheritDoc
     */
    maxPost() {
        const node = ChildrenNode.EMPTY_NODE.updateChild(this.indexPath_, MAX_NODE$2);
        return new NamedNode(MAX_NAME, node);
    }
    /**
     * @inheritDoc
     */
    toString() {
        return this.indexPath_.slice().join('/');
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Class representing a firebase data snapshot.  It wraps a SnapshotNode and
 * surfaces the public methods (val, forEach, etc.) we want to expose.
 */
class DataSnapshot {
    /**
     * @param {!Node} node_ A SnapshotNode to wrap.
     * @param {!Reference} ref_ The ref of the location this snapshot came from.
     * @param {!Index} index_ The iteration order for this snapshot
     */
    constructor(node_, ref_, index_) {
        this.node_ = node_;
        this.ref_ = ref_;
        this.index_ = index_;
    }
    /**
     * Retrieves the snapshot contents as JSON.  Returns null if the snapshot is
     * empty.
     *
     * @return {*} JSON representation of the DataSnapshot contents, or null if empty.
     */
    val() {
        validateArgCount('DataSnapshot.val', 0, 0, arguments.length);
        return this.node_.val();
    }
    /**
     * Returns the snapshot contents as JSON, including priorities of node.  Suitable for exporting
     * the entire node contents.
     * @return {*} JSON representation of the DataSnapshot contents, or null if empty.
     */
    exportVal() {
        validateArgCount('DataSnapshot.exportVal', 0, 0, arguments.length);
        return this.node_.val(true);
    }
    // Do not create public documentation. This is intended to make JSON serialization work but is otherwise unnecessary
    // for end-users
    toJSON() {
        // Optional spacer argument is unnecessary because we're depending on recursion rather than stringifying the content
        validateArgCount('DataSnapshot.toJSON', 0, 1, arguments.length);
        return this.exportVal();
    }
    /**
     * Returns whether the snapshot contains a non-null value.
     *
     * @return {boolean} Whether the snapshot contains a non-null value, or is empty.
     */
    exists() {
        validateArgCount('DataSnapshot.exists', 0, 0, arguments.length);
        return !this.node_.isEmpty();
    }
    /**
     * Returns a DataSnapshot of the specified child node's contents.
     *
     * @param {!string} childPathString Path to a child.
     * @return {!DataSnapshot} DataSnapshot for child node.
     */
    child(childPathString) {
        validateArgCount('DataSnapshot.child', 0, 1, arguments.length);
        // Ensure the childPath is a string (can be a number)
        childPathString = String(childPathString);
        validatePathString('DataSnapshot.child', 1, childPathString, false);
        const childPath = new Path(childPathString);
        const childRef = this.ref_.child(childPath);
        return new DataSnapshot(this.node_.getChild(childPath), childRef, PRIORITY_INDEX);
    }
    /**
     * Returns whether the snapshot contains a child at the specified path.
     *
     * @param {!string} childPathString Path to a child.
     * @return {boolean} Whether the child exists.
     */
    hasChild(childPathString) {
        validateArgCount('DataSnapshot.hasChild', 1, 1, arguments.length);
        validatePathString('DataSnapshot.hasChild', 1, childPathString, false);
        const childPath = new Path(childPathString);
        return !this.node_.getChild(childPath).isEmpty();
    }
    /**
     * Returns the priority of the object, or null if no priority was set.
     *
     * @return {string|number|null} The priority.
     */
    getPriority() {
        validateArgCount('DataSnapshot.getPriority', 0, 0, arguments.length);
        // typecast here because we never return deferred values or internal priorities (MAX_PRIORITY)
        return this.node_.getPriority().val();
    }
    /**
     * Iterates through child nodes and calls the specified action for each one.
     *
     * @param {function(!DataSnapshot)} action Callback function to be called
     * for each child.
     * @return {boolean} True if forEach was canceled by action returning true for
     * one of the child nodes.
     */
    forEach(action) {
        validateArgCount('DataSnapshot.forEach', 1, 1, arguments.length);
        validateCallback('DataSnapshot.forEach', 1, action, false);
        if (this.node_.isLeafNode())
            return false;
        const childrenNode = this.node_;
        // Sanitize the return value to a boolean. ChildrenNode.forEachChild has a weird return type...
        return !!childrenNode.forEachChild(this.index_, (key, node) => {
            return action(new DataSnapshot(node, this.ref_.child(key), PRIORITY_INDEX));
        });
    }
    /**
     * Returns whether this DataSnapshot has children.
     * @return {boolean} True if the DataSnapshot contains 1 or more child nodes.
     */
    hasChildren() {
        validateArgCount('DataSnapshot.hasChildren', 0, 0, arguments.length);
        if (this.node_.isLeafNode())
            return false;
        else
            return !this.node_.isEmpty();
    }
    get key() {
        return this.ref_.getKey();
    }
    /**
     * Returns the number of children for this DataSnapshot.
     * @return {number} The number of children that this DataSnapshot contains.
     */
    numChildren() {
        validateArgCount('DataSnapshot.numChildren', 0, 0, arguments.length);
        return this.node_.numChildren();
    }
    /**
     * @return {Reference} The Firebase reference for the location this snapshot's data came from.
     */
    getRef() {
        validateArgCount('DataSnapshot.ref', 0, 0, arguments.length);
        return this.ref_;
    }
    get ref() {
        return this.getRef();
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Encapsulates the data needed to raise an event
 * @implements {Event}
 */
class DataEvent {
    /**
     * @param {!string} eventType One of: value, child_added, child_changed, child_moved, child_removed
     * @param {!EventRegistration} eventRegistration The function to call to with the event data. User provided
     * @param {!DataSnapshot} snapshot The data backing the event
     * @param {?string=} prevName Optional, the name of the previous child for child_* events.
     */
    constructor(eventType, eventRegistration, snapshot, prevName) {
        this.eventType = eventType;
        this.eventRegistration = eventRegistration;
        this.snapshot = snapshot;
        this.prevName = prevName;
    }
    /**
     * @inheritDoc
     */
    getPath() {
        const ref = this.snapshot.getRef();
        if (this.eventType === 'value') {
            return ref.path;
        }
        else {
            return ref.getParent().path;
        }
    }
    /**
     * @inheritDoc
     */
    getEventType() {
        return this.eventType;
    }
    /**
     * @inheritDoc
     */
    getEventRunner() {
        return this.eventRegistration.getEventRunner(this);
    }
    /**
     * @inheritDoc
     */
    toString() {
        return (this.getPath().toString() +
            ':' +
            this.eventType +
            ':' +
            stringify(this.snapshot.exportVal()));
    }
}
class CancelEvent {
    /**
     * @param {EventRegistration} eventRegistration
     * @param {Error} error
     * @param {!Path} path
     */
    constructor(eventRegistration, error, path) {
        this.eventRegistration = eventRegistration;
        this.error = error;
        this.path = path;
    }
    /**
     * @inheritDoc
     */
    getPath() {
        return this.path;
    }
    /**
     * @inheritDoc
     */
    getEventType() {
        return 'cancel';
    }
    /**
     * @inheritDoc
     */
    getEventRunner() {
        return this.eventRegistration.getEventRunner(this);
    }
    /**
     * @inheritDoc
     */
    toString() {
        return this.path.toString() + ':cancel';
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Represents registration for 'value' events.
 */
class ValueEventRegistration {
    /**
     * @param {?function(!DataSnapshot)} callback_
     * @param {?function(Error)} cancelCallback_
     * @param {?Object} context_
     */
    constructor(callback_, cancelCallback_, context_) {
        this.callback_ = callback_;
        this.cancelCallback_ = cancelCallback_;
        this.context_ = context_;
    }
    /**
     * @inheritDoc
     */
    respondsTo(eventType) {
        return eventType === 'value';
    }
    /**
     * @inheritDoc
     */
    createEvent(change, query) {
        const index = query.getQueryParams().getIndex();
        return new DataEvent('value', this, new DataSnapshot(change.snapshotNode, query.getRef(), index));
    }
    /**
     * @inheritDoc
     */
    getEventRunner(eventData) {
        const ctx = this.context_;
        if (eventData.getEventType() === 'cancel') {
            assert(this.cancelCallback_, 'Raising a cancel event on a listener with no cancel callback');
            const cancelCB = this.cancelCallback_;
            return function () {
                // We know that error exists, we checked above that this is a cancel event
                cancelCB.call(ctx, eventData.error);
            };
        }
        else {
            const cb = this.callback_;
            return function () {
                cb.call(ctx, eventData.snapshot);
            };
        }
    }
    /**
     * @inheritDoc
     */
    createCancelEvent(error, path) {
        if (this.cancelCallback_) {
            return new CancelEvent(this, error, path);
        }
        else {
            return null;
        }
    }
    /**
     * @inheritDoc
     */
    matches(other) {
        if (!(other instanceof ValueEventRegistration)) {
            return false;
        }
        else if (!other.callback_ || !this.callback_) {
            // If no callback specified, we consider it to match any callback.
            return true;
        }
        else {
            return (other.callback_ === this.callback_ && other.context_ === this.context_);
        }
    }
    /**
     * @inheritDoc
     */
    hasAnyCallback() {
        return this.callback_ !== null;
    }
}
/**
 * Represents the registration of 1 or more child_xxx events.
 *
 * Currently, it is always exactly 1 child_xxx event, but the idea is we might let you
 * register a group of callbacks together in the future.
 *
 * @constructor
 * @implements {EventRegistration}
 */
class ChildEventRegistration {
    /**
     * @param {?Object.<string, function(!DataSnapshot, ?string=)>} callbacks_
     * @param {?function(Error)} cancelCallback_
     * @param {Object=} context_
     */
    constructor(callbacks_, cancelCallback_, context_) {
        this.callbacks_ = callbacks_;
        this.cancelCallback_ = cancelCallback_;
        this.context_ = context_;
    }
    /**
     * @inheritDoc
     */
    respondsTo(eventType) {
        let eventToCheck = eventType === 'children_added' ? 'child_added' : eventType;
        eventToCheck =
            eventToCheck === 'children_removed' ? 'child_removed' : eventToCheck;
        return contains(this.callbacks_, eventToCheck);
    }
    /**
     * @inheritDoc
     */
    createCancelEvent(error, path) {
        if (this.cancelCallback_) {
            return new CancelEvent(this, error, path);
        }
        else {
            return null;
        }
    }
    /**
     * @inheritDoc
     */
    createEvent(change, query) {
        assert(change.childName != null, 'Child events should have a childName.');
        const ref = query.getRef().child(/** @type {!string} */ (change.childName));
        const index = query.getQueryParams().getIndex();
        return new DataEvent(change.type, this, new DataSnapshot(change.snapshotNode, ref, index), change.prevName);
    }
    /**
     * @inheritDoc
     */
    getEventRunner(eventData) {
        const ctx = this.context_;
        if (eventData.getEventType() === 'cancel') {
            assert(this.cancelCallback_, 'Raising a cancel event on a listener with no cancel callback');
            const cancelCB = this.cancelCallback_;
            return function () {
                // We know that error exists, we checked above that this is a cancel event
                cancelCB.call(ctx, eventData.error);
            };
        }
        else {
            const cb = this.callbacks_[eventData.eventType];
            return function () {
                cb.call(ctx, eventData.snapshot, eventData.prevName);
            };
        }
    }
    /**
     * @inheritDoc
     */
    matches(other) {
        if (other instanceof ChildEventRegistration) {
            if (!this.callbacks_ || !other.callbacks_) {
                return true;
            }
            else if (this.context_ === other.context_) {
                const otherCount = getCount(other.callbacks_);
                const thisCount = getCount(this.callbacks_);
                if (otherCount === thisCount) {
                    // If count is 1, do an exact match on eventType, if either is defined but null, it's a match.
                    //  If event types don't match, not a match
                    // If count is not 1, exact match across all
                    if (otherCount === 1) {
                        const otherKey /** @type {!string} */ = getAnyKey(other.callbacks_);
                        const thisKey /** @type {!string} */ = getAnyKey(this.callbacks_);
                        return (thisKey === otherKey &&
                            (!other.callbacks_[otherKey] ||
                                !this.callbacks_[thisKey] ||
                                other.callbacks_[otherKey] === this.callbacks_[thisKey]));
                    }
                    else {
                        // Exact match on each key.
                        return every(this.callbacks_, (eventType, cb) => other.callbacks_[eventType] === cb);
                    }
                }
            }
        }
        return false;
    }
    /**
     * @inheritDoc
     */
    hasAnyCallback() {
        return this.callbacks_ !== null;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let __referenceConstructor;
/**
 * A Query represents a filter to be applied to a firebase location.  This object purely represents the
 * query expression (and exposes our public API to build the query).  The actual query logic is in ViewBase.js.
 *
 * Since every Firebase reference is a query, Firebase inherits from this object.
 */
class Query {
    constructor(repo, path, queryParams_, orderByCalled_) {
        this.repo = repo;
        this.path = path;
        this.queryParams_ = queryParams_;
        this.orderByCalled_ = orderByCalled_;
    }
    static set __referenceConstructor(val) {
        __referenceConstructor = val;
    }
    static get __referenceConstructor() {
        assert(__referenceConstructor, 'Reference.ts has not been loaded');
        return __referenceConstructor;
    }
    /**
     * Validates start/end values for queries.
     * @param {!QueryParams} params
     * @private
     */
    static validateQueryEndpoints_(params) {
        let startNode = null;
        let endNode = null;
        if (params.hasStart()) {
            startNode = params.getIndexStartValue();
        }
        if (params.hasEnd()) {
            endNode = params.getIndexEndValue();
        }
        if (params.getIndex() === KEY_INDEX) {
            const tooManyArgsError = 'Query: When ordering by key, you may only pass one argument to ' +
                'startAt(), endAt(), or equalTo().';
            const wrongArgTypeError = 'Query: When ordering by key, the argument passed to startAt(), endAt(),' +
                'or equalTo() must be a string.';
            if (params.hasStart()) {
                const startName = params.getIndexStartName();
                if (startName != MIN_NAME) {
                    throw new Error(tooManyArgsError);
                }
                else if (typeof startNode !== 'string') {
                    throw new Error(wrongArgTypeError);
                }
            }
            if (params.hasEnd()) {
                const endName = params.getIndexEndName();
                if (endName != MAX_NAME) {
                    throw new Error(tooManyArgsError);
                }
                else if (typeof endNode !== 'string') {
                    throw new Error(wrongArgTypeError);
                }
            }
        }
        else if (params.getIndex() === PRIORITY_INDEX) {
            if ((startNode != null && !isValidPriority(startNode)) ||
                (endNode != null && !isValidPriority(endNode))) {
                throw new Error('Query: When ordering by priority, the first argument passed to startAt(), ' +
                    'endAt(), or equalTo() must be a valid priority value (null, a number, or a string).');
            }
        }
        else {
            assert(params.getIndex() instanceof PathIndex ||
                params.getIndex() === VALUE_INDEX, 'unknown index type.');
            if ((startNode != null && typeof startNode === 'object') ||
                (endNode != null && typeof endNode === 'object')) {
                throw new Error('Query: First argument passed to startAt(), endAt(), or equalTo() cannot be ' +
                    'an object.');
            }
        }
    }
    /**
     * Validates that limit* has been called with the correct combination of parameters
     * @param {!QueryParams} params
     * @private
     */
    static validateLimit_(params) {
        if (params.hasStart() &&
            params.hasEnd() &&
            params.hasLimit() &&
            !params.hasAnchoredLimit()) {
            throw new Error("Query: Can't combine startAt(), endAt(), and limit(). Use limitToFirst() or limitToLast() instead.");
        }
    }
    /**
     * Validates that no other order by call has been made
     * @param {!string} fnName
     * @private
     */
    validateNoPreviousOrderByCall_(fnName) {
        if (this.orderByCalled_ === true) {
            throw new Error(fnName + ": You can't combine multiple orderBy calls.");
        }
    }
    /**
     * @return {!QueryParams}
     */
    getQueryParams() {
        return this.queryParams_;
    }
    /**
     * @return {!Reference}
     */
    getRef() {
        validateArgCount('Query.ref', 0, 0, arguments.length);
        // This is a slight hack. We cannot goog.require('fb.api.Firebase'), since Firebase requires fb.api.Query.
        // However, we will always export 'Firebase' to the global namespace, so it's guaranteed to exist by the time this
        // method gets called.
        return new Query.__referenceConstructor(this.repo, this.path);
    }
    /**
     * @param {!string} eventType
     * @param {!function(DataSnapshot, string=)} callback
     * @param {(function(Error)|Object)=} cancelCallbackOrContext
     * @param {Object=} context
     * @return {!function(DataSnapshot, string=)}
     */
    on(eventType, callback, cancelCallbackOrContext, context) {
        validateArgCount('Query.on', 2, 4, arguments.length);
        validateEventType('Query.on', 1, eventType, false);
        validateCallback('Query.on', 2, callback, false);
        const ret = Query.getCancelAndContextArgs_('Query.on', cancelCallbackOrContext, context);
        if (eventType === 'value') {
            this.onValueEvent(callback, ret.cancel, ret.context);
        }
        else {
            const callbacks = {};
            callbacks[eventType] = callback;
            this.onChildEvent(callbacks, ret.cancel, ret.context);
        }
        return callback;
    }
    /**
     * @param {!function(!DataSnapshot)} callback
     * @param {?function(Error)} cancelCallback
     * @param {?Object} context
     * @protected
     */
    onValueEvent(callback, cancelCallback, context) {
        const container = new ValueEventRegistration(callback, cancelCallback || null, context || null);
        this.repo.addEventCallbackForQuery(this, container);
    }
    /**
     * @param {!Object.<string, !function(!DataSnapshot, ?string)>} callbacks
     * @param {?function(Error)} cancelCallback
     * @param {?Object} context
     * @protected
     */
    onChildEvent(callbacks, cancelCallback, context) {
        const container = new ChildEventRegistration(callbacks, cancelCallback, context);
        this.repo.addEventCallbackForQuery(this, container);
    }
    /**
     * @param {string=} eventType
     * @param {(function(!DataSnapshot, ?string=))=} callback
     * @param {Object=} context
     */
    off(eventType, callback, context) {
        validateArgCount('Query.off', 0, 3, arguments.length);
        validateEventType('Query.off', 1, eventType, true);
        validateCallback('Query.off', 2, callback, true);
        validateContextObject('Query.off', 3, context, true);
        let container = null;
        let callbacks = null;
        if (eventType === 'value') {
            const valueCallback = callback || null;
            container = new ValueEventRegistration(valueCallback, null, context || null);
        }
        else if (eventType) {
            if (callback) {
                callbacks = {};
                callbacks[eventType] = callback;
            }
            container = new ChildEventRegistration(callbacks, null, context || null);
        }
        this.repo.removeEventCallbackForQuery(this, container);
    }
    /**
     * Attaches a listener, waits for the first event, and then removes the listener
     * @param {!string} eventType
     * @param {!function(!DataSnapshot, string=)} userCallback
     * @param failureCallbackOrContext
     * @param context
     * @return {!firebase.Promise}
     */
    once(eventType, userCallback, failureCallbackOrContext, context) {
        validateArgCount('Query.once', 1, 4, arguments.length);
        validateEventType('Query.once', 1, eventType, false);
        validateCallback('Query.once', 2, userCallback, true);
        const ret = Query.getCancelAndContextArgs_('Query.once', failureCallbackOrContext, context);
        // TODO: Implement this more efficiently (in particular, use 'get' wire protocol for 'value' event)
        // TODO: consider actually wiring the callbacks into the promise. We cannot do this without a breaking change
        // because the API currently expects callbacks will be called synchronously if the data is cached, but this is
        // against the Promise specification.
        let firstCall = true;
        const deferred = new Deferred();
        // A dummy error handler in case a user wasn't expecting promises
        deferred.promise.catch(() => { });
        const onceCallback = (snapshot) => {
            // NOTE: Even though we unsubscribe, we may get called multiple times if a single action (e.g. set() with JSON)
            // triggers multiple events (e.g. child_added or child_changed).
            if (firstCall) {
                firstCall = false;
                this.off(eventType, onceCallback);
                if (userCallback) {
                    userCallback.bind(ret.context)(snapshot);
                }
                deferred.resolve(snapshot);
            }
        };
        this.on(eventType, onceCallback, 
        /*cancel=*/ err => {
            this.off(eventType, onceCallback);
            if (ret.cancel)
                ret.cancel.bind(ret.context)(err);
            deferred.reject(err);
        });
        return deferred.promise;
    }
    /**
     * Set a limit and anchor it to the start of the window.
     * @param {!number} limit
     * @return {!Query}
     */
    limitToFirst(limit) {
        validateArgCount('Query.limitToFirst', 1, 1, arguments.length);
        if (typeof limit !== 'number' ||
            Math.floor(limit) !== limit ||
            limit <= 0) {
            throw new Error('Query.limitToFirst: First argument must be a positive integer.');
        }
        if (this.queryParams_.hasLimit()) {
            throw new Error('Query.limitToFirst: Limit was already set (by another call to limit, ' +
                'limitToFirst, or limitToLast).');
        }
        return new Query(this.repo, this.path, this.queryParams_.limitToFirst(limit), this.orderByCalled_);
    }
    /**
     * Set a limit and anchor it to the end of the window.
     * @param {!number} limit
     * @return {!Query}
     */
    limitToLast(limit) {
        validateArgCount('Query.limitToLast', 1, 1, arguments.length);
        if (typeof limit !== 'number' ||
            Math.floor(limit) !== limit ||
            limit <= 0) {
            throw new Error('Query.limitToLast: First argument must be a positive integer.');
        }
        if (this.queryParams_.hasLimit()) {
            throw new Error('Query.limitToLast: Limit was already set (by another call to limit, ' +
                'limitToFirst, or limitToLast).');
        }
        return new Query(this.repo, this.path, this.queryParams_.limitToLast(limit), this.orderByCalled_);
    }
    /**
     * Given a child path, return a new query ordered by the specified grandchild path.
     * @param {!string} path
     * @return {!Query}
     */
    orderByChild(path) {
        validateArgCount('Query.orderByChild', 1, 1, arguments.length);
        if (path === '$key') {
            throw new Error('Query.orderByChild: "$key" is invalid.  Use Query.orderByKey() instead.');
        }
        else if (path === '$priority') {
            throw new Error('Query.orderByChild: "$priority" is invalid.  Use Query.orderByPriority() instead.');
        }
        else if (path === '$value') {
            throw new Error('Query.orderByChild: "$value" is invalid.  Use Query.orderByValue() instead.');
        }
        validatePathString('Query.orderByChild', 1, path, false);
        this.validateNoPreviousOrderByCall_('Query.orderByChild');
        const parsedPath = new Path(path);
        if (parsedPath.isEmpty()) {
            throw new Error('Query.orderByChild: cannot pass in empty path.  Use Query.orderByValue() instead.');
        }
        const index = new PathIndex(parsedPath);
        const newParams = this.queryParams_.orderBy(index);
        Query.validateQueryEndpoints_(newParams);
        return new Query(this.repo, this.path, newParams, /*orderByCalled=*/ true);
    }
    /**
     * Return a new query ordered by the KeyIndex
     * @return {!Query}
     */
    orderByKey() {
        validateArgCount('Query.orderByKey', 0, 0, arguments.length);
        this.validateNoPreviousOrderByCall_('Query.orderByKey');
        const newParams = this.queryParams_.orderBy(KEY_INDEX);
        Query.validateQueryEndpoints_(newParams);
        return new Query(this.repo, this.path, newParams, /*orderByCalled=*/ true);
    }
    /**
     * Return a new query ordered by the PriorityIndex
     * @return {!Query}
     */
    orderByPriority() {
        validateArgCount('Query.orderByPriority', 0, 0, arguments.length);
        this.validateNoPreviousOrderByCall_('Query.orderByPriority');
        const newParams = this.queryParams_.orderBy(PRIORITY_INDEX);
        Query.validateQueryEndpoints_(newParams);
        return new Query(this.repo, this.path, newParams, /*orderByCalled=*/ true);
    }
    /**
     * Return a new query ordered by the ValueIndex
     * @return {!Query}
     */
    orderByValue() {
        validateArgCount('Query.orderByValue', 0, 0, arguments.length);
        this.validateNoPreviousOrderByCall_('Query.orderByValue');
        const newParams = this.queryParams_.orderBy(VALUE_INDEX);
        Query.validateQueryEndpoints_(newParams);
        return new Query(this.repo, this.path, newParams, /*orderByCalled=*/ true);
    }
    /**
     * @param {number|string|boolean|null} value
     * @param {?string=} name
     * @return {!Query}
     */
    startAt(value = null, name) {
        validateArgCount('Query.startAt', 0, 2, arguments.length);
        validateFirebaseDataArg('Query.startAt', 1, value, this.path, true);
        validateKey('Query.startAt', 2, name, true);
        const newParams = this.queryParams_.startAt(value, name);
        Query.validateLimit_(newParams);
        Query.validateQueryEndpoints_(newParams);
        if (this.queryParams_.hasStart()) {
            throw new Error('Query.startAt: Starting point was already set (by another call to startAt ' +
                'or equalTo).');
        }
        // Calling with no params tells us to start at the beginning.
        if (value === undefined) {
            value = null;
            name = null;
        }
        return new Query(this.repo, this.path, newParams, this.orderByCalled_);
    }
    /**
     * @param {number|string|boolean|null} value
     * @param {?string=} name
     * @return {!Query}
     */
    endAt(value = null, name) {
        validateArgCount('Query.endAt', 0, 2, arguments.length);
        validateFirebaseDataArg('Query.endAt', 1, value, this.path, true);
        validateKey('Query.endAt', 2, name, true);
        const newParams = this.queryParams_.endAt(value, name);
        Query.validateLimit_(newParams);
        Query.validateQueryEndpoints_(newParams);
        if (this.queryParams_.hasEnd()) {
            throw new Error('Query.endAt: Ending point was already set (by another call to endAt or ' +
                'equalTo).');
        }
        return new Query(this.repo, this.path, newParams, this.orderByCalled_);
    }
    /**
     * Load the selection of children with exactly the specified value, and, optionally,
     * the specified name.
     * @param {number|string|boolean|null} value
     * @param {string=} name
     * @return {!Query}
     */
    equalTo(value, name) {
        validateArgCount('Query.equalTo', 1, 2, arguments.length);
        validateFirebaseDataArg('Query.equalTo', 1, value, this.path, false);
        validateKey('Query.equalTo', 2, name, true);
        if (this.queryParams_.hasStart()) {
            throw new Error('Query.equalTo: Starting point was already set (by another call to startAt or ' +
                'equalTo).');
        }
        if (this.queryParams_.hasEnd()) {
            throw new Error('Query.equalTo: Ending point was already set (by another call to endAt or ' +
                'equalTo).');
        }
        return this.startAt(value, name).endAt(value, name);
    }
    /**
     * @return {!string} URL for this location.
     */
    toString() {
        validateArgCount('Query.toString', 0, 0, arguments.length);
        return this.repo.toString() + this.path.toUrlEncodedString();
    }
    // Do not create public documentation. This is intended to make JSON serialization work but is otherwise unnecessary
    // for end-users.
    toJSON() {
        // An optional spacer argument is unnecessary for a string.
        validateArgCount('Query.toJSON', 0, 1, arguments.length);
        return this.toString();
    }
    /**
     * An object representation of the query parameters used by this Query.
     * @return {!Object}
     */
    queryObject() {
        return this.queryParams_.getQueryObject();
    }
    /**
     * @return {!string}
     */
    queryIdentifier() {
        const obj = this.queryObject();
        const id = ObjectToUniqueKey(obj);
        return id === '{}' ? 'default' : id;
    }
    /**
     * Return true if this query and the provided query are equivalent; otherwise, return false.
     * @param {Query} other
     * @return {boolean}
     */
    isEqual(other) {
        validateArgCount('Query.isEqual', 1, 1, arguments.length);
        if (!(other instanceof Query)) {
            const error = 'Query.isEqual failed: First argument must be an instance of firebase.database.Query.';
            throw new Error(error);
        }
        const sameRepo = this.repo === other.repo;
        const samePath = this.path.equals(other.path);
        const sameQueryIdentifier = this.queryIdentifier() === other.queryIdentifier();
        return sameRepo && samePath && sameQueryIdentifier;
    }
    /**
     * Helper used by .on and .once to extract the context and or cancel arguments.
     * @param {!string} fnName The function name (on or once)
     * @param {(function(Error)|Object)=} cancelOrContext
     * @param {Object=} context
     * @return {{cancel: ?function(Error), context: ?Object}}
     * @private
     */
    static getCancelAndContextArgs_(fnName, cancelOrContext, context) {
        const ret = { cancel: null, context: null };
        if (cancelOrContext && context) {
            ret.cancel = cancelOrContext;
            validateCallback(fnName, 3, ret.cancel, true);
            ret.context = context;
            validateContextObject(fnName, 4, ret.context, true);
        }
        else if (cancelOrContext) {
            // we have either a cancel callback or a context.
            if (typeof cancelOrContext === 'object' && cancelOrContext !== null) {
                // it's a context!
                ret.context = cancelOrContext;
            }
            else if (typeof cancelOrContext === 'function') {
                ret.cancel = cancelOrContext;
            }
            else {
                throw new Error(errorPrefix(fnName, 3, true) +
                    ' must either be a cancel callback or a context object.');
            }
        }
        return ret;
    }
    get ref() {
        return this.getRef();
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Implements a set with a count of elements.
 *
 * @template K, V
 */
class CountedSet {
    constructor() {
        this.set = {};
    }
    /**
     * @param {!K} item
     * @param {V} val
     */
    add(item, val) {
        this.set[item] = val !== null ? val : true;
    }
    /**
     * @param {!K} key
     * @return {boolean}
     */
    contains(key) {
        return contains(this.set, key);
    }
    /**
     * @param {!K} item
     * @return {V}
     */
    get(item) {
        return this.contains(item) ? this.set[item] : undefined;
    }
    /**
     * @param {!K} item
     */
    remove(item) {
        delete this.set[item];
    }
    /**
     * Deletes everything in the set
     */
    clear() {
        this.set = {};
    }
    /**
     * True if there's nothing in the set
     * @return {boolean}
     */
    isEmpty() {
        return isEmpty(this.set);
    }
    /**
     * @return {number} The number of items in the set
     */
    count() {
        return getCount(this.set);
    }
    /**
     * Run a function on each k,v pair in the set
     * @param {function(K, V)} fn
     */
    each(fn) {
        forEach(this.set, (k, v) => fn(k, v));
    }
    /**
     * Mostly for debugging
     * @return {Array.<K>} The keys present in this CountedSet
     */
    keys() {
        const keys = [];
        forEach(this.set, (k) => {
            keys.push(k);
        });
        return keys;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Helper class to store a sparse set of snapshots.
 *
 * @constructor
 */
class SparseSnapshotTree {
    constructor() {
        /**
         * @private
         * @type {Node}
         */
        this.value_ = null;
        /**
         * @private
         * @type {CountedSet}
         */
        this.children_ = null;
    }
    /**
     * Gets the node stored at the given path if one exists.
     *
     * @param {!Path} path Path to look up snapshot for.
     * @return {?Node} The retrieved node, or null.
     */
    find(path) {
        if (this.value_ != null) {
            return this.value_.getChild(path);
        }
        else if (!path.isEmpty() && this.children_ != null) {
            const childKey = path.getFront();
            path = path.popFront();
            if (this.children_.contains(childKey)) {
                const childTree = this.children_.get(childKey);
                return childTree.find(path);
            }
            else {
                return null;
            }
        }
        else {
            return null;
        }
    }
    /**
     * Stores the given node at the specified path. If there is already a node
     * at a shallower path, it merges the new data into that snapshot node.
     *
     * @param {!Path} path Path to look up snapshot for.
     * @param {!Node} data The new data, or null.
     */
    remember(path, data) {
        if (path.isEmpty()) {
            this.value_ = data;
            this.children_ = null;
        }
        else if (this.value_ !== null) {
            this.value_ = this.value_.updateChild(path, data);
        }
        else {
            if (this.children_ == null) {
                this.children_ = new CountedSet();
            }
            const childKey = path.getFront();
            if (!this.children_.contains(childKey)) {
                this.children_.add(childKey, new SparseSnapshotTree());
            }
            const child = this.children_.get(childKey);
            path = path.popFront();
            child.remember(path, data);
        }
    }
    /**
     * Purge the data at path from the cache.
     *
     * @param {!Path} path Path to look up snapshot for.
     * @return {boolean} True if this node should now be removed.
     */
    forget(path) {
        if (path.isEmpty()) {
            this.value_ = null;
            this.children_ = null;
            return true;
        }
        else {
            if (this.value_ !== null) {
                if (this.value_.isLeafNode()) {
                    // We're trying to forget a node that doesn't exist
                    return false;
                }
                else {
                    const value = this.value_;
                    this.value_ = null;
                    const self = this;
                    value.forEachChild(PRIORITY_INDEX, function (key, tree) {
                        self.remember(new Path(key), tree);
                    });
                    return this.forget(path);
                }
            }
            else if (this.children_ !== null) {
                const childKey = path.getFront();
                path = path.popFront();
                if (this.children_.contains(childKey)) {
                    const safeToRemove = this.children_.get(childKey).forget(path);
                    if (safeToRemove) {
                        this.children_.remove(childKey);
                    }
                }
                if (this.children_.isEmpty()) {
                    this.children_ = null;
                    return true;
                }
                else {
                    return false;
                }
            }
            else {
                return true;
            }
        }
    }
    /**
     * Recursively iterates through all of the stored tree and calls the
     * callback on each one.
     *
     * @param {!Path} prefixPath Path to look up node for.
     * @param {!Function} func The function to invoke for each tree.
     */
    forEachTree(prefixPath, func) {
        if (this.value_ !== null) {
            func(prefixPath, this.value_);
        }
        else {
            this.forEachChild((key, tree) => {
                const path = new Path(prefixPath.toString() + '/' + key);
                tree.forEachTree(path, func);
            });
        }
    }
    /**
     * Iterates through each immediate child and triggers the callback.
     *
     * @param {!Function} func The function to invoke for each child.
     */
    forEachChild(func) {
        if (this.children_ !== null) {
            this.children_.each((key, tree) => {
                func(key, tree);
            });
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Generate placeholders for deferred values.
 * @param {?Object} values
 * @return {!Object}
 */
const generateWithValues = function (values) {
    values = values || {};
    values['timestamp'] = values['timestamp'] || new Date().getTime();
    return values;
};
/**
 * Value to use when firing local events. When writing server values, fire
 * local events with an approximate value, otherwise return value as-is.
 * @param {(Object|string|number|boolean)} value
 * @param {!Object} serverValues
 * @return {!(string|number|boolean)}
 */
const resolveDeferredValue = function (value, serverValues) {
    if (!value || typeof value !== 'object') {
        return value;
    }
    else {
        assert('.sv' in value, 'Unexpected leaf node or priority contents');
        return serverValues[value['.sv']];
    }
};
/**
 * Recursively replace all deferred values and priorities in the tree with the
 * specified generated replacement values.
 * @param {!SparseSnapshotTree} tree
 * @param {!Object} serverValues
 * @return {!SparseSnapshotTree}
 */
const resolveDeferredValueTree = function (tree, serverValues) {
    const resolvedTree = new SparseSnapshotTree();
    tree.forEachTree(new Path(''), function (path, node) {
        resolvedTree.remember(path, resolveDeferredValueSnapshot(node, serverValues));
    });
    return resolvedTree;
};
/**
 * Recursively replace all deferred values and priorities in the node with the
 * specified generated replacement values.  If there are no server values in the node,
 * it'll be returned as-is.
 * @param {!Node} node
 * @param {!Object} serverValues
 * @return {!Node}
 */
const resolveDeferredValueSnapshot = function (node, serverValues) {
    const rawPri = node.getPriority().val();
    const priority = resolveDeferredValue(rawPri, serverValues);
    let newNode;
    if (node.isLeafNode()) {
        const leafNode = node;
        const value = resolveDeferredValue(leafNode.getValue(), serverValues);
        if (value !== leafNode.getValue() ||
            priority !== leafNode.getPriority().val()) {
            return new LeafNode(value, nodeFromJSON$1(priority));
        }
        else {
            return node;
        }
    }
    else {
        const childrenNode = node;
        newNode = childrenNode;
        if (priority !== childrenNode.getPriority().val()) {
            newNode = newNode.updatePriority(new LeafNode(priority));
        }
        childrenNode.forEachChild(PRIORITY_INDEX, function (childName, childNode) {
            const newChildNode = resolveDeferredValueSnapshot(childNode, serverValues);
            if (newChildNode !== childNode) {
                newNode = newNode.updateImmediateChild(childName, newChildNode);
            }
        });
        return newNode;
    }
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 *
 * @enum
 */
var OperationType;
(function (OperationType) {
    OperationType[OperationType["OVERWRITE"] = 0] = "OVERWRITE";
    OperationType[OperationType["MERGE"] = 1] = "MERGE";
    OperationType[OperationType["ACK_USER_WRITE"] = 2] = "ACK_USER_WRITE";
    OperationType[OperationType["LISTEN_COMPLETE"] = 3] = "LISTEN_COMPLETE";
})(OperationType || (OperationType = {}));
/**
 * @param {boolean} fromUser
 * @param {boolean} fromServer
 * @param {?string} queryId
 * @param {boolean} tagged
 * @constructor
 */
class OperationSource {
    constructor(fromUser, fromServer, queryId, tagged) {
        this.fromUser = fromUser;
        this.fromServer = fromServer;
        this.queryId = queryId;
        this.tagged = tagged;
        assert(!tagged || fromServer, 'Tagged queries must be from server.');
    }
}
/**
 * @const
 * @type {!OperationSource}
 */
OperationSource.User = new OperationSource(
/*fromUser=*/ true, false, null, 
/*tagged=*/ false);
/**
 * @const
 * @type {!OperationSource}
 */
OperationSource.Server = new OperationSource(false, 
/*fromServer=*/ true, null, 
/*tagged=*/ false);
/**
 * @param {string} queryId
 * @return {!OperationSource}
 */
OperationSource.forServerTaggedQuery = function (queryId) {
    return new OperationSource(false, 
    /*fromServer=*/ true, queryId, 
    /*tagged=*/ true);
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
class AckUserWrite {
    /**
     *
     * @param {!Path} path
     * @param {!ImmutableTree<!boolean>} affectedTree A tree containing true for each affected path. Affected paths can't overlap.
     * @param {!boolean} revert
     */
    constructor(
    /**@inheritDoc */ path, 
    /**@inheritDoc */ affectedTree, 
    /**@inheritDoc */ revert) {
        this.path = path;
        this.affectedTree = affectedTree;
        this.revert = revert;
        /** @inheritDoc */
        this.type = OperationType.ACK_USER_WRITE;
        /** @inheritDoc */
        this.source = OperationSource.User;
    }
    /**
     * @inheritDoc
     */
    operationForChild(childName) {
        if (!this.path.isEmpty()) {
            assert(this.path.getFront() === childName, 'operationForChild called for unrelated child.');
            return new AckUserWrite(this.path.popFront(), this.affectedTree, this.revert);
        }
        else if (this.affectedTree.value != null) {
            assert(this.affectedTree.children.isEmpty(), 'affectedTree should not have overlapping affected paths.');
            // All child locations are affected as well; just return same operation.
            return this;
        }
        else {
            const childTree = this.affectedTree.subtree(new Path(childName));
            return new AckUserWrite(Path.Empty, childTree, this.revert);
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let emptyChildrenSingleton;
/**
 * Singleton empty children collection.
 *
 * @const
 * @type {!SortedMap.<string, !ImmutableTree.<?>>}
 */
const EmptyChildren = () => {
    if (!emptyChildrenSingleton) {
        emptyChildrenSingleton = new SortedMap(stringCompare);
    }
    return emptyChildrenSingleton;
};
/**
 * A tree with immutable elements.
 */
class ImmutableTree {
    /**
     * @template T
     * @param {?T} value
     * @param {SortedMap.<string, !ImmutableTree.<T>>=} children
     */
    constructor(value, children = EmptyChildren()) {
        this.value = value;
        this.children = children;
    }
    /**
     * @template T
     * @param {!Object.<string, !T>} obj
     * @return {!ImmutableTree.<!T>}
     */
    static fromObject(obj) {
        let tree = ImmutableTree.Empty;
        forEach(obj, (childPath, childSnap) => {
            tree = tree.set(new Path(childPath), childSnap);
        });
        return tree;
    }
    /**
     * True if the value is empty and there are no children
     * @return {boolean}
     */
    isEmpty() {
        return this.value === null && this.children.isEmpty();
    }
    /**
     * Given a path and predicate, return the first node and the path to that node
     * where the predicate returns true.
     *
     * TODO Do a perf test -- If we're creating a bunch of {path: value:} objects
     * on the way back out, it may be better to pass down a pathSoFar obj.
     *
     * @param {!Path} relativePath The remainder of the path
     * @param {function(T):boolean} predicate The predicate to satisfy to return a
     *   node
     * @return {?{path:!Path, value:!T}}
     */
    findRootMostMatchingPathAndValue(relativePath, predicate) {
        if (this.value != null && predicate(this.value)) {
            return { path: Path.Empty, value: this.value };
        }
        else {
            if (relativePath.isEmpty()) {
                return null;
            }
            else {
                const front = relativePath.getFront();
                const child = this.children.get(front);
                if (child !== null) {
                    const childExistingPathAndValue = child.findRootMostMatchingPathAndValue(relativePath.popFront(), predicate);
                    if (childExistingPathAndValue != null) {
                        const fullPath = new Path(front).child(childExistingPathAndValue.path);
                        return { path: fullPath, value: childExistingPathAndValue.value };
                    }
                    else {
                        return null;
                    }
                }
                else {
                    return null;
                }
            }
        }
    }
    /**
     * Find, if it exists, the shortest subpath of the given path that points a defined
     * value in the tree
     * @param {!Path} relativePath
     * @return {?{path: !Path, value: !T}}
     */
    findRootMostValueAndPath(relativePath) {
        return this.findRootMostMatchingPathAndValue(relativePath, () => true);
    }
    /**
     * @param {!Path} relativePath
     * @return {!ImmutableTree.<T>} The subtree at the given path
     */
    subtree(relativePath) {
        if (relativePath.isEmpty()) {
            return this;
        }
        else {
            const front = relativePath.getFront();
            const childTree = this.children.get(front);
            if (childTree !== null) {
                return childTree.subtree(relativePath.popFront());
            }
            else {
                return ImmutableTree.Empty;
            }
        }
    }
    /**
     * Sets a value at the specified path.
     *
     * @param {!Path} relativePath Path to set value at.
     * @param {?T} toSet Value to set.
     * @return {!ImmutableTree.<T>} Resulting tree.
     */
    set(relativePath, toSet) {
        if (relativePath.isEmpty()) {
            return new ImmutableTree(toSet, this.children);
        }
        else {
            const front = relativePath.getFront();
            const child = this.children.get(front) || ImmutableTree.Empty;
            const newChild = child.set(relativePath.popFront(), toSet);
            const newChildren = this.children.insert(front, newChild);
            return new ImmutableTree(this.value, newChildren);
        }
    }
    /**
     * Removes the value at the specified path.
     *
     * @param {!Path} relativePath Path to value to remove.
     * @return {!ImmutableTree.<T>} Resulting tree.
     */
    remove(relativePath) {
        if (relativePath.isEmpty()) {
            if (this.children.isEmpty()) {
                return ImmutableTree.Empty;
            }
            else {
                return new ImmutableTree(null, this.children);
            }
        }
        else {
            const front = relativePath.getFront();
            const child = this.children.get(front);
            if (child) {
                const newChild = child.remove(relativePath.popFront());
                let newChildren;
                if (newChild.isEmpty()) {
                    newChildren = this.children.remove(front);
                }
                else {
                    newChildren = this.children.insert(front, newChild);
                }
                if (this.value === null && newChildren.isEmpty()) {
                    return ImmutableTree.Empty;
                }
                else {
                    return new ImmutableTree(this.value, newChildren);
                }
            }
            else {
                return this;
            }
        }
    }
    /**
     * Gets a value from the tree.
     *
     * @param {!Path} relativePath Path to get value for.
     * @return {?T} Value at path, or null.
     */
    get(relativePath) {
        if (relativePath.isEmpty()) {
            return this.value;
        }
        else {
            const front = relativePath.getFront();
            const child = this.children.get(front);
            if (child) {
                return child.get(relativePath.popFront());
            }
            else {
                return null;
            }
        }
    }
    /**
     * Replace the subtree at the specified path with the given new tree.
     *
     * @param {!Path} relativePath Path to replace subtree for.
     * @param {!ImmutableTree} newTree New tree.
     * @return {!ImmutableTree} Resulting tree.
     */
    setTree(relativePath, newTree) {
        if (relativePath.isEmpty()) {
            return newTree;
        }
        else {
            const front = relativePath.getFront();
            const child = this.children.get(front) || ImmutableTree.Empty;
            const newChild = child.setTree(relativePath.popFront(), newTree);
            let newChildren;
            if (newChild.isEmpty()) {
                newChildren = this.children.remove(front);
            }
            else {
                newChildren = this.children.insert(front, newChild);
            }
            return new ImmutableTree(this.value, newChildren);
        }
    }
    /**
     * Performs a depth first fold on this tree. Transforms a tree into a single
     * value, given a function that operates on the path to a node, an optional
     * current value, and a map of child names to folded subtrees
     * @template V
     * @param {function(Path, ?T, Object.<string, V>):V} fn
     * @return {V}
     */
    fold(fn) {
        return this.fold_(Path.Empty, fn);
    }
    /**
     * Recursive helper for public-facing fold() method
     * @template V
     * @param {!Path} pathSoFar
     * @param {function(Path, ?T, Object.<string, V>):V} fn
     * @return {V}
     * @private
     */
    fold_(pathSoFar, fn) {
        const accum = {};
        this.children.inorderTraversal(function (childKey, childTree) {
            accum[childKey] = childTree.fold_(pathSoFar.child(childKey), fn);
        });
        return fn(pathSoFar, this.value, accum);
    }
    /**
     * Find the first matching value on the given path. Return the result of applying f to it.
     * @template V
     * @param {!Path} path
     * @param {!function(!Path, !T):?V} f
     * @return {?V}
     */
    findOnPath(path, f) {
        return this.findOnPath_(path, Path.Empty, f);
    }
    findOnPath_(pathToFollow, pathSoFar, f) {
        const result = this.value ? f(pathSoFar, this.value) : false;
        if (result) {
            return result;
        }
        else {
            if (pathToFollow.isEmpty()) {
                return null;
            }
            else {
                const front = pathToFollow.getFront();
                const nextChild = this.children.get(front);
                if (nextChild) {
                    return nextChild.findOnPath_(pathToFollow.popFront(), pathSoFar.child(front), f);
                }
                else {
                    return null;
                }
            }
        }
    }
    /**
     *
     * @param {!Path} path
     * @param {!function(!Path, !T)} f
     * @returns {!ImmutableTree.<T>}
     */
    foreachOnPath(path, f) {
        return this.foreachOnPath_(path, Path.Empty, f);
    }
    foreachOnPath_(pathToFollow, currentRelativePath, f) {
        if (pathToFollow.isEmpty()) {
            return this;
        }
        else {
            if (this.value) {
                f(currentRelativePath, this.value);
            }
            const front = pathToFollow.getFront();
            const nextChild = this.children.get(front);
            if (nextChild) {
                return nextChild.foreachOnPath_(pathToFollow.popFront(), currentRelativePath.child(front), f);
            }
            else {
                return ImmutableTree.Empty;
            }
        }
    }
    /**
     * Calls the given function for each node in the tree that has a value.
     *
     * @param {function(!Path, !T)} f A function to be called with
     *   the path from the root of the tree to a node, and the value at that node.
     *   Called in depth-first order.
     */
    foreach(f) {
        this.foreach_(Path.Empty, f);
    }
    foreach_(currentRelativePath, f) {
        this.children.inorderTraversal(function (childName, childTree) {
            childTree.foreach_(currentRelativePath.child(childName), f);
        });
        if (this.value) {
            f(currentRelativePath, this.value);
        }
    }
    /**
     *
     * @param {function(string, !T)} f
     */
    foreachChild(f) {
        this.children.inorderTraversal((childName, childTree) => {
            if (childTree.value) {
                f(childName, childTree.value);
            }
        });
    }
}
ImmutableTree.Empty = new ImmutableTree(null);

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @param {!OperationSource} source
 * @param {!Path} path
 * @constructor
 * @implements {Operation}
 */
class ListenComplete {
    constructor(source, path) {
        this.source = source;
        this.path = path;
        /** @inheritDoc */
        this.type = OperationType.LISTEN_COMPLETE;
    }
    operationForChild(childName) {
        if (this.path.isEmpty()) {
            return new ListenComplete(this.source, Path.Empty);
        }
        else {
            return new ListenComplete(this.source, this.path.popFront());
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @param {!OperationSource} source
 * @param {!Path} path
 * @param {!Node} snap
 * @constructor
 * @implements {Operation}
 */
class Overwrite {
    constructor(source, path, snap) {
        this.source = source;
        this.path = path;
        this.snap = snap;
        /** @inheritDoc */
        this.type = OperationType.OVERWRITE;
    }
    operationForChild(childName) {
        if (this.path.isEmpty()) {
            return new Overwrite(this.source, Path.Empty, this.snap.getImmediateChild(childName));
        }
        else {
            return new Overwrite(this.source, this.path.popFront(), this.snap);
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @param {!OperationSource} source
 * @param {!Path} path
 * @param {!ImmutableTree.<!Node>} children
 * @constructor
 * @implements {Operation}
 */
class Merge {
    constructor(
    /**@inheritDoc */ source, 
    /**@inheritDoc */ path, 
    /**@inheritDoc */ children) {
        this.source = source;
        this.path = path;
        this.children = children;
        /** @inheritDoc */
        this.type = OperationType.MERGE;
    }
    /**
     * @inheritDoc
     */
    operationForChild(childName) {
        if (this.path.isEmpty()) {
            const childTree = this.children.subtree(new Path(childName));
            if (childTree.isEmpty()) {
                // This child is unaffected
                return null;
            }
            else if (childTree.value) {
                // We have a snapshot for the child in question.  This becomes an overwrite of the child.
                return new Overwrite(this.source, Path.Empty, childTree.value);
            }
            else {
                // This is a merge at a deeper level
                return new Merge(this.source, Path.Empty, childTree);
            }
        }
        else {
            assert(this.path.getFront() === childName, "Can't get a merge for a child not on the path of the operation");
            return new Merge(this.source, this.path.popFront(), this.children);
        }
    }
    /**
     * @inheritDoc
     */
    toString() {
        return ('Operation(' +
            this.path +
            ': ' +
            this.source.toString() +
            ' merge: ' +
            this.children.toString() +
            ')');
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A cache node only stores complete children. Additionally it holds a flag whether the node can be considered fully
 * initialized in the sense that we know at one point in time this represented a valid state of the world, e.g.
 * initialized with data from the server, or a complete overwrite by the client. The filtered flag also tracks
 * whether a node potentially had children removed due to a filter.
 */
class CacheNode {
    /**
     * @param {!Node} node_
     * @param {boolean} fullyInitialized_
     * @param {boolean} filtered_
     */
    constructor(node_, fullyInitialized_, filtered_) {
        this.node_ = node_;
        this.fullyInitialized_ = fullyInitialized_;
        this.filtered_ = filtered_;
    }
    /**
     * Returns whether this node was fully initialized with either server data or a complete overwrite by the client
     * @return {boolean}
     */
    isFullyInitialized() {
        return this.fullyInitialized_;
    }
    /**
     * Returns whether this node is potentially missing children due to a filter applied to the node
     * @return {boolean}
     */
    isFiltered() {
        return this.filtered_;
    }
    /**
     * @param {!Path} path
     * @return {boolean}
     */
    isCompleteForPath(path) {
        if (path.isEmpty()) {
            return this.isFullyInitialized() && !this.filtered_;
        }
        const childKey = path.getFront();
        return this.isCompleteForChild(childKey);
    }
    /**
     * @param {!string} key
     * @return {boolean}
     */
    isCompleteForChild(key) {
        return ((this.isFullyInitialized() && !this.filtered_) || this.node_.hasChild(key));
    }
    /**
     * @return {!Node}
     */
    getNode() {
        return this.node_;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Stores the data we have cached for a view.
 *
 * serverSnap is the cached server data, eventSnap is the cached event data (server data plus any local writes).
 *
 * @constructor
 */
class ViewCache {
    /**
     *
     * @param {!CacheNode} eventCache_
     * @param {!CacheNode} serverCache_
     */
    constructor(eventCache_, serverCache_) {
        this.eventCache_ = eventCache_;
        this.serverCache_ = serverCache_;
    }
    /**
     * @param {!Node} eventSnap
     * @param {boolean} complete
     * @param {boolean} filtered
     * @return {!ViewCache}
     */
    updateEventSnap(eventSnap, complete, filtered) {
        return new ViewCache(new CacheNode(eventSnap, complete, filtered), this.serverCache_);
    }
    /**
     * @param {!Node} serverSnap
     * @param {boolean} complete
     * @param {boolean} filtered
     * @return {!ViewCache}
     */
    updateServerSnap(serverSnap, complete, filtered) {
        return new ViewCache(this.eventCache_, new CacheNode(serverSnap, complete, filtered));
    }
    /**
     * @return {!CacheNode}
     */
    getEventCache() {
        return this.eventCache_;
    }
    /**
     * @return {?Node}
     */
    getCompleteEventSnap() {
        return this.eventCache_.isFullyInitialized()
            ? this.eventCache_.getNode()
            : null;
    }
    /**
     * @return {!CacheNode}
     */
    getServerCache() {
        return this.serverCache_;
    }
    /**
     * @return {?Node}
     */
    getCompleteServerSnap() {
        return this.serverCache_.isFullyInitialized()
            ? this.serverCache_.getNode()
            : null;
    }
}
/**
 * @const
 * @type {ViewCache}
 */
ViewCache.Empty = new ViewCache(new CacheNode(ChildrenNode.EMPTY_NODE, 
/*fullyInitialized=*/ false, 
/*filtered=*/ false), new CacheNode(ChildrenNode.EMPTY_NODE, 
/*fullyInitialized=*/ false, 
/*filtered=*/ false));

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @constructor
 * @struct
 * @param {!string} type The event type
 * @param {!Node} snapshotNode The data
 * @param {string=} childName The name for this child, if it's a child event
 * @param {Node=} oldSnap Used for intermediate processing of child changed events
 * @param {string=} prevName The name for the previous child, if applicable
 */
class Change {
    constructor(type, snapshotNode, childName, oldSnap, prevName) {
        this.type = type;
        this.snapshotNode = snapshotNode;
        this.childName = childName;
        this.oldSnap = oldSnap;
        this.prevName = prevName;
    }
    /**
     * @param {!Node} snapshot
     * @return {!Change}
     */
    static valueChange(snapshot) {
        return new Change(Change.VALUE, snapshot);
    }
    /**
     * @param {string} childKey
     * @param {!Node} snapshot
     * @return {!Change}
     */
    static childAddedChange(childKey, snapshot) {
        return new Change(Change.CHILD_ADDED, snapshot, childKey);
    }
    /**
     * @param {string} childKey
     * @param {!Node} snapshot
     * @return {!Change}
     */
    static childRemovedChange(childKey, snapshot) {
        return new Change(Change.CHILD_REMOVED, snapshot, childKey);
    }
    /**
     * @param {string} childKey
     * @param {!Node} newSnapshot
     * @param {!Node} oldSnapshot
     * @return {!Change}
     */
    static childChangedChange(childKey, newSnapshot, oldSnapshot) {
        return new Change(Change.CHILD_CHANGED, newSnapshot, childKey, oldSnapshot);
    }
    /**
     * @param {string} childKey
     * @param {!Node} snapshot
     * @return {!Change}
     */
    static childMovedChange(childKey, snapshot) {
        return new Change(Change.CHILD_MOVED, snapshot, childKey);
    }
}
//event types
/** Event type for a child added */
Change.CHILD_ADDED = 'child_added';
/** Event type for a child removed */
Change.CHILD_REMOVED = 'child_removed';
/** Event type for a child changed */
Change.CHILD_CHANGED = 'child_changed';
/** Event type for a child moved */
Change.CHILD_MOVED = 'child_moved';
/** Event type for a value change */
Change.VALUE = 'value';

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Doesn't really filter nodes but applies an index to the node and keeps track of any changes
 *
 * @constructor
 * @implements {NodeFilter}
 * @param {!Index} index
 */
class IndexedFilter {
    constructor(index_) {
        this.index_ = index_;
    }
    updateChild(snap, key, newChild, affectedPath, source, optChangeAccumulator) {
        assert(snap.isIndexed(this.index_), 'A node must be indexed if only a child is updated');
        const oldChild = snap.getImmediateChild(key);
        // Check if anything actually changed.
        if (oldChild.getChild(affectedPath).equals(newChild.getChild(affectedPath))) {
            // There's an edge case where a child can enter or leave the view because affectedPath was set to null.
            // In this case, affectedPath will appear null in both the old and new snapshots.  So we need
            // to avoid treating these cases as "nothing changed."
            if (oldChild.isEmpty() == newChild.isEmpty()) {
                // Nothing changed.
                // This assert should be valid, but it's expensive (can dominate perf testing) so don't actually do it.
                //assert(oldChild.equals(newChild), 'Old and new snapshots should be equal.');
                return snap;
            }
        }
        if (optChangeAccumulator != null) {
            if (newChild.isEmpty()) {
                if (snap.hasChild(key)) {
                    optChangeAccumulator.trackChildChange(Change.childRemovedChange(key, oldChild));
                }
                else {
                    assert(snap.isLeafNode(), 'A child remove without an old child only makes sense on a leaf node');
                }
            }
            else if (oldChild.isEmpty()) {
                optChangeAccumulator.trackChildChange(Change.childAddedChange(key, newChild));
            }
            else {
                optChangeAccumulator.trackChildChange(Change.childChangedChange(key, newChild, oldChild));
            }
        }
        if (snap.isLeafNode() && newChild.isEmpty()) {
            return snap;
        }
        else {
            // Make sure the node is indexed
            return snap.updateImmediateChild(key, newChild).withIndex(this.index_);
        }
    }
    /**
     * @inheritDoc
     */
    updateFullNode(oldSnap, newSnap, optChangeAccumulator) {
        if (optChangeAccumulator != null) {
            if (!oldSnap.isLeafNode()) {
                oldSnap.forEachChild(PRIORITY_INDEX, function (key, childNode) {
                    if (!newSnap.hasChild(key)) {
                        optChangeAccumulator.trackChildChange(Change.childRemovedChange(key, childNode));
                    }
                });
            }
            if (!newSnap.isLeafNode()) {
                newSnap.forEachChild(PRIORITY_INDEX, function (key, childNode) {
                    if (oldSnap.hasChild(key)) {
                        const oldChild = oldSnap.getImmediateChild(key);
                        if (!oldChild.equals(childNode)) {
                            optChangeAccumulator.trackChildChange(Change.childChangedChange(key, childNode, oldChild));
                        }
                    }
                    else {
                        optChangeAccumulator.trackChildChange(Change.childAddedChange(key, childNode));
                    }
                });
            }
        }
        return newSnap.withIndex(this.index_);
    }
    /**
     * @inheritDoc
     */
    updatePriority(oldSnap, newPriority) {
        if (oldSnap.isEmpty()) {
            return ChildrenNode.EMPTY_NODE;
        }
        else {
            return oldSnap.updatePriority(newPriority);
        }
    }
    /**
     * @inheritDoc
     */
    filtersNodes() {
        return false;
    }
    /**
     * @inheritDoc
     */
    getIndexedFilter() {
        return this;
    }
    /**
     * @inheritDoc
     */
    getIndex() {
        return this.index_;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @constructor
 */
class ChildChangeAccumulator {
    constructor() {
        this.changeMap_ = {};
    }
    /**
     * @param {!Change} change
     */
    trackChildChange(change) {
        const type = change.type;
        const childKey /** @type {!string} */ = change.childName;
        assert(type == Change.CHILD_ADDED ||
            type == Change.CHILD_CHANGED ||
            type == Change.CHILD_REMOVED, 'Only child changes supported for tracking');
        assert(childKey !== '.priority', 'Only non-priority child changes can be tracked.');
        const oldChange = safeGet(this.changeMap_, childKey);
        if (oldChange) {
            const oldType = oldChange.type;
            if (type == Change.CHILD_ADDED && oldType == Change.CHILD_REMOVED) {
                this.changeMap_[childKey] = Change.childChangedChange(childKey, change.snapshotNode, oldChange.snapshotNode);
            }
            else if (type == Change.CHILD_REMOVED &&
                oldType == Change.CHILD_ADDED) {
                delete this.changeMap_[childKey];
            }
            else if (type == Change.CHILD_REMOVED &&
                oldType == Change.CHILD_CHANGED) {
                this.changeMap_[childKey] = Change.childRemovedChange(childKey, oldChange.oldSnap);
            }
            else if (type == Change.CHILD_CHANGED &&
                oldType == Change.CHILD_ADDED) {
                this.changeMap_[childKey] = Change.childAddedChange(childKey, change.snapshotNode);
            }
            else if (type == Change.CHILD_CHANGED &&
                oldType == Change.CHILD_CHANGED) {
                this.changeMap_[childKey] = Change.childChangedChange(childKey, change.snapshotNode, oldChange.oldSnap);
            }
            else {
                throw assertionError('Illegal combination of changes: ' +
                    change +
                    ' occurred after ' +
                    oldChange);
            }
        }
        else {
            this.changeMap_[childKey] = change;
        }
    }
    /**
     * @return {!Array.<!Change>}
     */
    getChanges() {
        return getValues(this.changeMap_);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An implementation of CompleteChildSource that never returns any additional children
 *
 * @private
 * @constructor
 * @implements CompleteChildSource
 */
class NoCompleteChildSource_ {
    /**
     * @inheritDoc
     */
    getCompleteChild(childKey) {
        return null;
    }
    /**
     * @inheritDoc
     */
    getChildAfterChild(index, child, reverse) {
        return null;
    }
}
/**
 * Singleton instance.
 * @const
 * @type {!CompleteChildSource}
 */
const NO_COMPLETE_CHILD_SOURCE = new NoCompleteChildSource_();
/**
 * An implementation of CompleteChildSource that uses a WriteTree in addition to any other server data or
 * old event caches available to calculate complete children.
 *
 *
 * @implements CompleteChildSource
 */
class WriteTreeCompleteChildSource {
    /**
     * @param {!WriteTreeRef} writes_
     * @param {!ViewCache} viewCache_
     * @param {?Node} optCompleteServerCache_
     */
    constructor(writes_, viewCache_, optCompleteServerCache_ = null) {
        this.writes_ = writes_;
        this.viewCache_ = viewCache_;
        this.optCompleteServerCache_ = optCompleteServerCache_;
    }
    /**
     * @inheritDoc
     */
    getCompleteChild(childKey) {
        const node = this.viewCache_.getEventCache();
        if (node.isCompleteForChild(childKey)) {
            return node.getNode().getImmediateChild(childKey);
        }
        else {
            const serverNode = this.optCompleteServerCache_ != null
                ? new CacheNode(this.optCompleteServerCache_, true, false)
                : this.viewCache_.getServerCache();
            return this.writes_.calcCompleteChild(childKey, serverNode);
        }
    }
    /**
     * @inheritDoc
     */
    getChildAfterChild(index, child, reverse) {
        const completeServerData = this.optCompleteServerCache_ != null
            ? this.optCompleteServerCache_
            : this.viewCache_.getCompleteServerSnap();
        const nodes = this.writes_.calcIndexedSlice(completeServerData, child, 1, reverse, index);
        if (nodes.length === 0) {
            return null;
        }
        else {
            return nodes[0];
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @constructor
 * @struct
 */
class ProcessorResult {
    /**
     * @param {!ViewCache} viewCache
     * @param {!Array.<!Change>} changes
     */
    constructor(viewCache, changes) {
        this.viewCache = viewCache;
        this.changes = changes;
    }
}
/**
 * @constructor
 */
class ViewProcessor {
    /**
     * @param {!NodeFilter} filter_
     */
    constructor(filter_) {
        this.filter_ = filter_;
    }
    /**
     * @param {!ViewCache} viewCache
     */
    assertIndexed(viewCache) {
        assert(viewCache
            .getEventCache()
            .getNode()
            .isIndexed(this.filter_.getIndex()), 'Event snap not indexed');
        assert(viewCache
            .getServerCache()
            .getNode()
            .isIndexed(this.filter_.getIndex()), 'Server snap not indexed');
    }
    /**
     * @param {!ViewCache} oldViewCache
     * @param {!Operation} operation
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeCache
     * @return {!ProcessorResult}
     */
    applyOperation(oldViewCache, operation, writesCache, completeCache) {
        const accumulator = new ChildChangeAccumulator();
        let newViewCache, filterServerNode;
        if (operation.type === OperationType.OVERWRITE) {
            const overwrite = operation;
            if (overwrite.source.fromUser) {
                newViewCache = this.applyUserOverwrite_(oldViewCache, overwrite.path, overwrite.snap, writesCache, completeCache, accumulator);
            }
            else {
                assert(overwrite.source.fromServer, 'Unknown source.');
                // We filter the node if it's a tagged update or the node has been previously filtered  and the
                // update is not at the root in which case it is ok (and necessary) to mark the node unfiltered
                // again
                filterServerNode =
                    overwrite.source.tagged ||
                        (oldViewCache.getServerCache().isFiltered() &&
                            !overwrite.path.isEmpty());
                newViewCache = this.applyServerOverwrite_(oldViewCache, overwrite.path, overwrite.snap, writesCache, completeCache, filterServerNode, accumulator);
            }
        }
        else if (operation.type === OperationType.MERGE) {
            const merge = operation;
            if (merge.source.fromUser) {
                newViewCache = this.applyUserMerge_(oldViewCache, merge.path, merge.children, writesCache, completeCache, accumulator);
            }
            else {
                assert(merge.source.fromServer, 'Unknown source.');
                // We filter the node if it's a tagged update or the node has been previously filtered
                filterServerNode =
                    merge.source.tagged || oldViewCache.getServerCache().isFiltered();
                newViewCache = this.applyServerMerge_(oldViewCache, merge.path, merge.children, writesCache, completeCache, filterServerNode, accumulator);
            }
        }
        else if (operation.type === OperationType.ACK_USER_WRITE) {
            const ackUserWrite = operation;
            if (!ackUserWrite.revert) {
                newViewCache = this.ackUserWrite_(oldViewCache, ackUserWrite.path, ackUserWrite.affectedTree, writesCache, completeCache, accumulator);
            }
            else {
                newViewCache = this.revertUserWrite_(oldViewCache, ackUserWrite.path, writesCache, completeCache, accumulator);
            }
        }
        else if (operation.type === OperationType.LISTEN_COMPLETE) {
            newViewCache = this.listenComplete_(oldViewCache, operation.path, writesCache, accumulator);
        }
        else {
            throw assertionError('Unknown operation type: ' + operation.type);
        }
        const changes = accumulator.getChanges();
        ViewProcessor.maybeAddValueEvent_(oldViewCache, newViewCache, changes);
        return new ProcessorResult(newViewCache, changes);
    }
    /**
     * @param {!ViewCache} oldViewCache
     * @param {!ViewCache} newViewCache
     * @param {!Array.<!Change>} accumulator
     * @private
     */
    static maybeAddValueEvent_(oldViewCache, newViewCache, accumulator) {
        const eventSnap = newViewCache.getEventCache();
        if (eventSnap.isFullyInitialized()) {
            const isLeafOrEmpty = eventSnap.getNode().isLeafNode() || eventSnap.getNode().isEmpty();
            const oldCompleteSnap = oldViewCache.getCompleteEventSnap();
            if (accumulator.length > 0 ||
                !oldViewCache.getEventCache().isFullyInitialized() ||
                (isLeafOrEmpty &&
                    !eventSnap
                        .getNode()
                        .equals(/** @type {!Node} */ (oldCompleteSnap))) ||
                !eventSnap
                    .getNode()
                    .getPriority()
                    .equals(oldCompleteSnap.getPriority())) {
                accumulator.push(Change.valueChange(
                /** @type {!Node} */ newViewCache.getCompleteEventSnap()));
            }
        }
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} changePath
     * @param {!WriteTreeRef} writesCache
     * @param {!CompleteChildSource} source
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    generateEventCacheAfterServerEvent_(viewCache, changePath, writesCache, source, accumulator) {
        const oldEventSnap = viewCache.getEventCache();
        if (writesCache.shadowingWrite(changePath) != null) {
            // we have a shadowing write, ignore changes
            return viewCache;
        }
        else {
            let newEventCache, serverNode;
            if (changePath.isEmpty()) {
                // TODO: figure out how this plays with "sliding ack windows"
                assert(viewCache.getServerCache().isFullyInitialized(), 'If change path is empty, we must have complete server data');
                if (viewCache.getServerCache().isFiltered()) {
                    // We need to special case this, because we need to only apply writes to complete children, or
                    // we might end up raising events for incomplete children. If the server data is filtered deep
                    // writes cannot be guaranteed to be complete
                    const serverCache = viewCache.getCompleteServerSnap();
                    const completeChildren = serverCache instanceof ChildrenNode
                        ? serverCache
                        : ChildrenNode.EMPTY_NODE;
                    const completeEventChildren = writesCache.calcCompleteEventChildren(completeChildren);
                    newEventCache = this.filter_.updateFullNode(viewCache.getEventCache().getNode(), completeEventChildren, accumulator);
                }
                else {
                    const completeNode = writesCache.calcCompleteEventCache(viewCache.getCompleteServerSnap());
                    newEventCache = this.filter_.updateFullNode(viewCache.getEventCache().getNode(), completeNode, accumulator);
                }
            }
            else {
                const childKey = changePath.getFront();
                if (childKey == '.priority') {
                    assert(changePath.getLength() == 1, "Can't have a priority with additional path components");
                    const oldEventNode = oldEventSnap.getNode();
                    serverNode = viewCache.getServerCache().getNode();
                    // we might have overwrites for this priority
                    const updatedPriority = writesCache.calcEventCacheAfterServerOverwrite(changePath, oldEventNode, serverNode);
                    if (updatedPriority != null) {
                        newEventCache = this.filter_.updatePriority(oldEventNode, updatedPriority);
                    }
                    else {
                        // priority didn't change, keep old node
                        newEventCache = oldEventSnap.getNode();
                    }
                }
                else {
                    const childChangePath = changePath.popFront();
                    // update child
                    let newEventChild;
                    if (oldEventSnap.isCompleteForChild(childKey)) {
                        serverNode = viewCache.getServerCache().getNode();
                        const eventChildUpdate = writesCache.calcEventCacheAfterServerOverwrite(changePath, oldEventSnap.getNode(), serverNode);
                        if (eventChildUpdate != null) {
                            newEventChild = oldEventSnap
                                .getNode()
                                .getImmediateChild(childKey)
                                .updateChild(childChangePath, eventChildUpdate);
                        }
                        else {
                            // Nothing changed, just keep the old child
                            newEventChild = oldEventSnap
                                .getNode()
                                .getImmediateChild(childKey);
                        }
                    }
                    else {
                        newEventChild = writesCache.calcCompleteChild(childKey, viewCache.getServerCache());
                    }
                    if (newEventChild != null) {
                        newEventCache = this.filter_.updateChild(oldEventSnap.getNode(), childKey, newEventChild, childChangePath, source, accumulator);
                    }
                    else {
                        // no complete child available or no change
                        newEventCache = oldEventSnap.getNode();
                    }
                }
            }
            return viewCache.updateEventSnap(newEventCache, oldEventSnap.isFullyInitialized() || changePath.isEmpty(), this.filter_.filtersNodes());
        }
    }
    /**
     * @param {!ViewCache} oldViewCache
     * @param {!Path} changePath
     * @param {!Node} changedSnap
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeCache
     * @param {boolean} filterServerNode
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    applyServerOverwrite_(oldViewCache, changePath, changedSnap, writesCache, completeCache, filterServerNode, accumulator) {
        const oldServerSnap = oldViewCache.getServerCache();
        let newServerCache;
        const serverFilter = filterServerNode
            ? this.filter_
            : this.filter_.getIndexedFilter();
        if (changePath.isEmpty()) {
            newServerCache = serverFilter.updateFullNode(oldServerSnap.getNode(), changedSnap, null);
        }
        else if (serverFilter.filtersNodes() && !oldServerSnap.isFiltered()) {
            // we want to filter the server node, but we didn't filter the server node yet, so simulate a full update
            const newServerNode = oldServerSnap
                .getNode()
                .updateChild(changePath, changedSnap);
            newServerCache = serverFilter.updateFullNode(oldServerSnap.getNode(), newServerNode, null);
        }
        else {
            const childKey = changePath.getFront();
            if (!oldServerSnap.isCompleteForPath(changePath) &&
                changePath.getLength() > 1) {
                // We don't update incomplete nodes with updates intended for other listeners
                return oldViewCache;
            }
            const childChangePath = changePath.popFront();
            const childNode = oldServerSnap.getNode().getImmediateChild(childKey);
            const newChildNode = childNode.updateChild(childChangePath, changedSnap);
            if (childKey == '.priority') {
                newServerCache = serverFilter.updatePriority(oldServerSnap.getNode(), newChildNode);
            }
            else {
                newServerCache = serverFilter.updateChild(oldServerSnap.getNode(), childKey, newChildNode, childChangePath, NO_COMPLETE_CHILD_SOURCE, null);
            }
        }
        const newViewCache = oldViewCache.updateServerSnap(newServerCache, oldServerSnap.isFullyInitialized() || changePath.isEmpty(), serverFilter.filtersNodes());
        const source = new WriteTreeCompleteChildSource(writesCache, newViewCache, completeCache);
        return this.generateEventCacheAfterServerEvent_(newViewCache, changePath, writesCache, source, accumulator);
    }
    /**
     * @param {!ViewCache} oldViewCache
     * @param {!Path} changePath
     * @param {!Node} changedSnap
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeCache
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    applyUserOverwrite_(oldViewCache, changePath, changedSnap, writesCache, completeCache, accumulator) {
        const oldEventSnap = oldViewCache.getEventCache();
        let newViewCache, newEventCache;
        const source = new WriteTreeCompleteChildSource(writesCache, oldViewCache, completeCache);
        if (changePath.isEmpty()) {
            newEventCache = this.filter_.updateFullNode(oldViewCache.getEventCache().getNode(), changedSnap, accumulator);
            newViewCache = oldViewCache.updateEventSnap(newEventCache, true, this.filter_.filtersNodes());
        }
        else {
            const childKey = changePath.getFront();
            if (childKey === '.priority') {
                newEventCache = this.filter_.updatePriority(oldViewCache.getEventCache().getNode(), changedSnap);
                newViewCache = oldViewCache.updateEventSnap(newEventCache, oldEventSnap.isFullyInitialized(), oldEventSnap.isFiltered());
            }
            else {
                const childChangePath = changePath.popFront();
                const oldChild = oldEventSnap.getNode().getImmediateChild(childKey);
                let newChild;
                if (childChangePath.isEmpty()) {
                    // Child overwrite, we can replace the child
                    newChild = changedSnap;
                }
                else {
                    const childNode = source.getCompleteChild(childKey);
                    if (childNode != null) {
                        if (childChangePath.getBack() === '.priority' &&
                            childNode.getChild(childChangePath.parent()).isEmpty()) {
                            // This is a priority update on an empty node. If this node exists on the server, the
                            // server will send down the priority in the update, so ignore for now
                            newChild = childNode;
                        }
                        else {
                            newChild = childNode.updateChild(childChangePath, changedSnap);
                        }
                    }
                    else {
                        // There is no complete child node available
                        newChild = ChildrenNode.EMPTY_NODE;
                    }
                }
                if (!oldChild.equals(newChild)) {
                    const newEventSnap = this.filter_.updateChild(oldEventSnap.getNode(), childKey, newChild, childChangePath, source, accumulator);
                    newViewCache = oldViewCache.updateEventSnap(newEventSnap, oldEventSnap.isFullyInitialized(), this.filter_.filtersNodes());
                }
                else {
                    newViewCache = oldViewCache;
                }
            }
        }
        return newViewCache;
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {string} childKey
     * @return {boolean}
     * @private
     */
    static cacheHasChild_(viewCache, childKey) {
        return viewCache.getEventCache().isCompleteForChild(childKey);
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} path
     * @param {ImmutableTree.<!Node>} changedChildren
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} serverCache
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    applyUserMerge_(viewCache, path, changedChildren, writesCache, serverCache, accumulator) {
        // HACK: In the case of a limit query, there may be some changes that bump things out of the
        // window leaving room for new items.  It's important we process these changes first, so we
        // iterate the changes twice, first processing any that affect items currently in view.
        // TODO: I consider an item "in view" if cacheHasChild is true, which checks both the server
        // and event snap.  I'm not sure if this will result in edge cases when a child is in one but
        // not the other.
        let curViewCache = viewCache;
        changedChildren.foreach((relativePath, childNode) => {
            const writePath = path.child(relativePath);
            if (ViewProcessor.cacheHasChild_(viewCache, writePath.getFront())) {
                curViewCache = this.applyUserOverwrite_(curViewCache, writePath, childNode, writesCache, serverCache, accumulator);
            }
        });
        changedChildren.foreach((relativePath, childNode) => {
            const writePath = path.child(relativePath);
            if (!ViewProcessor.cacheHasChild_(viewCache, writePath.getFront())) {
                curViewCache = this.applyUserOverwrite_(curViewCache, writePath, childNode, writesCache, serverCache, accumulator);
            }
        });
        return curViewCache;
    }
    /**
     * @param {!Node} node
     * @param {ImmutableTree.<!Node>} merge
     * @return {!Node}
     * @private
     */
    applyMerge_(node, merge) {
        merge.foreach(function (relativePath, childNode) {
            node = node.updateChild(relativePath, childNode);
        });
        return node;
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} path
     * @param {!ImmutableTree.<!Node>} changedChildren
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} serverCache
     * @param {boolean} filterServerNode
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    applyServerMerge_(viewCache, path, changedChildren, writesCache, serverCache, filterServerNode, accumulator) {
        // If we don't have a cache yet, this merge was intended for a previously listen in the same location. Ignore it and
        // wait for the complete data update coming soon.
        if (viewCache
            .getServerCache()
            .getNode()
            .isEmpty() &&
            !viewCache.getServerCache().isFullyInitialized()) {
            return viewCache;
        }
        // HACK: In the case of a limit query, there may be some changes that bump things out of the
        // window leaving room for new items.  It's important we process these changes first, so we
        // iterate the changes twice, first processing any that affect items currently in view.
        // TODO: I consider an item "in view" if cacheHasChild is true, which checks both the server
        // and event snap.  I'm not sure if this will result in edge cases when a child is in one but
        // not the other.
        let curViewCache = viewCache;
        let viewMergeTree;
        if (path.isEmpty()) {
            viewMergeTree = changedChildren;
        }
        else {
            viewMergeTree = ImmutableTree.Empty.setTree(path, changedChildren);
        }
        const serverNode = viewCache.getServerCache().getNode();
        viewMergeTree.children.inorderTraversal((childKey, childTree) => {
            if (serverNode.hasChild(childKey)) {
                const serverChild = viewCache
                    .getServerCache()
                    .getNode()
                    .getImmediateChild(childKey);
                const newChild = this.applyMerge_(serverChild, childTree);
                curViewCache = this.applyServerOverwrite_(curViewCache, new Path(childKey), newChild, writesCache, serverCache, filterServerNode, accumulator);
            }
        });
        viewMergeTree.children.inorderTraversal((childKey, childMergeTree) => {
            const isUnknownDeepMerge = !viewCache.getServerCache().isCompleteForChild(childKey) &&
                childMergeTree.value == null;
            if (!serverNode.hasChild(childKey) && !isUnknownDeepMerge) {
                const serverChild = viewCache
                    .getServerCache()
                    .getNode()
                    .getImmediateChild(childKey);
                const newChild = this.applyMerge_(serverChild, childMergeTree);
                curViewCache = this.applyServerOverwrite_(curViewCache, new Path(childKey), newChild, writesCache, serverCache, filterServerNode, accumulator);
            }
        });
        return curViewCache;
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} ackPath
     * @param {!ImmutableTree<!boolean>} affectedTree
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeCache
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    ackUserWrite_(viewCache, ackPath, affectedTree, writesCache, completeCache, accumulator) {
        if (writesCache.shadowingWrite(ackPath) != null) {
            return viewCache;
        }
        // Only filter server node if it is currently filtered
        const filterServerNode = viewCache.getServerCache().isFiltered();
        // Essentially we'll just get our existing server cache for the affected paths and re-apply it as a server update
        // now that it won't be shadowed.
        const serverCache = viewCache.getServerCache();
        if (affectedTree.value != null) {
            // This is an overwrite.
            if ((ackPath.isEmpty() && serverCache.isFullyInitialized()) ||
                serverCache.isCompleteForPath(ackPath)) {
                return this.applyServerOverwrite_(viewCache, ackPath, serverCache.getNode().getChild(ackPath), writesCache, completeCache, filterServerNode, accumulator);
            }
            else if (ackPath.isEmpty()) {
                // This is a goofy edge case where we are acking data at this location but don't have full data.  We
                // should just re-apply whatever we have in our cache as a merge.
                let changedChildren = ImmutableTree.Empty;
                serverCache.getNode().forEachChild(KEY_INDEX, function (name, node) {
                    changedChildren = changedChildren.set(new Path(name), node);
                });
                return this.applyServerMerge_(viewCache, ackPath, changedChildren, writesCache, completeCache, filterServerNode, accumulator);
            }
            else {
                return viewCache;
            }
        }
        else {
            // This is a merge.
            let changedChildren = ImmutableTree.Empty;
            affectedTree.foreach(function (mergePath, value) {
                const serverCachePath = ackPath.child(mergePath);
                if (serverCache.isCompleteForPath(serverCachePath)) {
                    changedChildren = changedChildren.set(mergePath, serverCache.getNode().getChild(serverCachePath));
                }
            });
            return this.applyServerMerge_(viewCache, ackPath, changedChildren, writesCache, completeCache, filterServerNode, accumulator);
        }
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} path
     * @param {!WriteTreeRef} writesCache
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    listenComplete_(viewCache, path, writesCache, accumulator) {
        const oldServerNode = viewCache.getServerCache();
        const newViewCache = viewCache.updateServerSnap(oldServerNode.getNode(), oldServerNode.isFullyInitialized() || path.isEmpty(), oldServerNode.isFiltered());
        return this.generateEventCacheAfterServerEvent_(newViewCache, path, writesCache, NO_COMPLETE_CHILD_SOURCE, accumulator);
    }
    /**
     * @param {!ViewCache} viewCache
     * @param {!Path} path
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeServerCache
     * @param {!ChildChangeAccumulator} accumulator
     * @return {!ViewCache}
     * @private
     */
    revertUserWrite_(viewCache, path, writesCache, completeServerCache, accumulator) {
        let complete;
        if (writesCache.shadowingWrite(path) != null) {
            return viewCache;
        }
        else {
            const source = new WriteTreeCompleteChildSource(writesCache, viewCache, completeServerCache);
            const oldEventCache = viewCache.getEventCache().getNode();
            let newEventCache;
            if (path.isEmpty() || path.getFront() === '.priority') {
                let newNode;
                if (viewCache.getServerCache().isFullyInitialized()) {
                    newNode = writesCache.calcCompleteEventCache(viewCache.getCompleteServerSnap());
                }
                else {
                    const serverChildren = viewCache.getServerCache().getNode();
                    assert(serverChildren instanceof ChildrenNode, 'serverChildren would be complete if leaf node');
                    newNode = writesCache.calcCompleteEventChildren(serverChildren);
                }
                newNode = newNode;
                newEventCache = this.filter_.updateFullNode(oldEventCache, newNode, accumulator);
            }
            else {
                const childKey = path.getFront();
                let newChild = writesCache.calcCompleteChild(childKey, viewCache.getServerCache());
                if (newChild == null &&
                    viewCache.getServerCache().isCompleteForChild(childKey)) {
                    newChild = oldEventCache.getImmediateChild(childKey);
                }
                if (newChild != null) {
                    newEventCache = this.filter_.updateChild(oldEventCache, childKey, newChild, path.popFront(), source, accumulator);
                }
                else if (viewCache
                    .getEventCache()
                    .getNode()
                    .hasChild(childKey)) {
                    // No complete child available, delete the existing one, if any
                    newEventCache = this.filter_.updateChild(oldEventCache, childKey, ChildrenNode.EMPTY_NODE, path.popFront(), source, accumulator);
                }
                else {
                    newEventCache = oldEventCache;
                }
                if (newEventCache.isEmpty() &&
                    viewCache.getServerCache().isFullyInitialized()) {
                    // We might have reverted all child writes. Maybe the old event was a leaf node
                    complete = writesCache.calcCompleteEventCache(viewCache.getCompleteServerSnap());
                    if (complete.isLeafNode()) {
                        newEventCache = this.filter_.updateFullNode(newEventCache, complete, accumulator);
                    }
                }
            }
            complete =
                viewCache.getServerCache().isFullyInitialized() ||
                    writesCache.shadowingWrite(Path.Empty) != null;
            return viewCache.updateEventSnap(newEventCache, complete, this.filter_.filtersNodes());
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An EventGenerator is used to convert "raw" changes (Change) as computed by the
 * CacheDiffer into actual events (Event) that can be raised.  See generateEventsForChanges()
 * for details.
 *
 * @constructor
 */
class EventGenerator {
    /**
     *
     * @param {!Query} query_
     */
    constructor(query_) {
        this.query_ = query_;
        /**
         * @private
         * @type {!Index}
         */
        this.index_ = this.query_.getQueryParams().getIndex();
    }
    /**
     * Given a set of raw changes (no moved events and prevName not specified yet), and a set of
     * EventRegistrations that should be notified of these changes, generate the actual events to be raised.
     *
     * Notes:
     *  - child_moved events will be synthesized at this time for any child_changed events that affect
     *    our index.
     *  - prevName will be calculated based on the index ordering.
     *
     * @param {!Array.<!Change>} changes
     * @param {!Node} eventCache
     * @param {!Array.<!EventRegistration>} eventRegistrations
     * @return {!Array.<!Event>}
     */
    generateEventsForChanges(changes, eventCache, eventRegistrations) {
        const events = [];
        const moves = [];
        changes.forEach(change => {
            if (change.type === Change.CHILD_CHANGED &&
                this.index_.indexedValueChanged(change.oldSnap, change.snapshotNode)) {
                moves.push(Change.childMovedChange(change.childName, change.snapshotNode));
            }
        });
        this.generateEventsForType_(events, Change.CHILD_REMOVED, changes, eventRegistrations, eventCache);
        this.generateEventsForType_(events, Change.CHILD_ADDED, changes, eventRegistrations, eventCache);
        this.generateEventsForType_(events, Change.CHILD_MOVED, moves, eventRegistrations, eventCache);
        this.generateEventsForType_(events, Change.CHILD_CHANGED, changes, eventRegistrations, eventCache);
        this.generateEventsForType_(events, Change.VALUE, changes, eventRegistrations, eventCache);
        return events;
    }
    /**
     * Given changes of a single change type, generate the corresponding events.
     *
     * @param {!Array.<!Event>} events
     * @param {!string} eventType
     * @param {!Array.<!Change>} changes
     * @param {!Array.<!EventRegistration>} registrations
     * @param {!Node} eventCache
     * @private
     */
    generateEventsForType_(events, eventType, changes, registrations, eventCache) {
        const filteredChanges = changes.filter(change => change.type === eventType);
        filteredChanges.sort(this.compareChanges_.bind(this));
        filteredChanges.forEach(change => {
            const materializedChange = this.materializeSingleChange_(change, eventCache);
            registrations.forEach(registration => {
                if (registration.respondsTo(change.type)) {
                    events.push(registration.createEvent(materializedChange, this.query_));
                }
            });
        });
    }
    /**
     * @param {!Change} change
     * @param {!Node} eventCache
     * @return {!Change}
     * @private
     */
    materializeSingleChange_(change, eventCache) {
        if (change.type === 'value' || change.type === 'child_removed') {
            return change;
        }
        else {
            change.prevName = eventCache.getPredecessorChildName(
            /** @type {!string} */
            change.childName, change.snapshotNode, this.index_);
            return change;
        }
    }
    /**
     * @param {!Change} a
     * @param {!Change} b
     * @return {number}
     * @private
     */
    compareChanges_(a, b) {
        if (a.childName == null || b.childName == null) {
            throw assertionError('Should only compare child_ events.');
        }
        const aWrapped = new NamedNode(a.childName, a.snapshotNode);
        const bWrapped = new NamedNode(b.childName, b.snapshotNode);
        return this.index_.compare(aWrapped, bWrapped);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * A view represents a specific location and query that has 1 or more event registrations.
 *
 * It does several things:
 *  - Maintains the list of event registrations for this location/query.
 *  - Maintains a cache of the data visible for this location/query.
 *  - Applies new operations (via applyOperation), updates the cache, and based on the event
 *    registrations returns the set of events to be raised.
 * @constructor
 */
class View {
    /**
     *
     * @param {!Query} query_
     * @param {!ViewCache} initialViewCache
     */
    constructor(query_, initialViewCache) {
        this.query_ = query_;
        this.eventRegistrations_ = [];
        const params = this.query_.getQueryParams();
        const indexFilter = new IndexedFilter(params.getIndex());
        const filter = params.getNodeFilter();
        /**
         * @type {ViewProcessor}
         * @private
         */
        this.processor_ = new ViewProcessor(filter);
        const initialServerCache = initialViewCache.getServerCache();
        const initialEventCache = initialViewCache.getEventCache();
        // Don't filter server node with other filter than index, wait for tagged listen
        const serverSnap = indexFilter.updateFullNode(ChildrenNode.EMPTY_NODE, initialServerCache.getNode(), null);
        const eventSnap = filter.updateFullNode(ChildrenNode.EMPTY_NODE, initialEventCache.getNode(), null);
        const newServerCache = new CacheNode(serverSnap, initialServerCache.isFullyInitialized(), indexFilter.filtersNodes());
        const newEventCache = new CacheNode(eventSnap, initialEventCache.isFullyInitialized(), filter.filtersNodes());
        /**
         * @type {!ViewCache}
         * @private
         */
        this.viewCache_ = new ViewCache(newEventCache, newServerCache);
        /**
         * @type {!EventGenerator}
         * @private
         */
        this.eventGenerator_ = new EventGenerator(this.query_);
    }
    /**
     * @return {!Query}
     */
    getQuery() {
        return this.query_;
    }
    /**
     * @return {?Node}
     */
    getServerCache() {
        return this.viewCache_.getServerCache().getNode();
    }
    /**
     * @param {!Path} path
     * @return {?Node}
     */
    getCompleteServerCache(path) {
        const cache = this.viewCache_.getCompleteServerSnap();
        if (cache) {
            // If this isn't a "loadsAllData" view, then cache isn't actually a complete cache and
            // we need to see if it contains the child we're interested in.
            if (this.query_.getQueryParams().loadsAllData() ||
                (!path.isEmpty() && !cache.getImmediateChild(path.getFront()).isEmpty())) {
                return cache.getChild(path);
            }
        }
        return null;
    }
    /**
     * @return {boolean}
     */
    isEmpty() {
        return this.eventRegistrations_.length === 0;
    }
    /**
     * @param {!EventRegistration} eventRegistration
     */
    addEventRegistration(eventRegistration) {
        this.eventRegistrations_.push(eventRegistration);
    }
    /**
     * @param {?EventRegistration} eventRegistration If null, remove all callbacks.
     * @param {Error=} cancelError If a cancelError is provided, appropriate cancel events will be returned.
     * @return {!Array.<!Event>} Cancel events, if cancelError was provided.
     */
    removeEventRegistration(eventRegistration, cancelError) {
        const cancelEvents = [];
        if (cancelError) {
            assert(eventRegistration == null, 'A cancel should cancel all event registrations.');
            const path = this.query_.path;
            this.eventRegistrations_.forEach(function (registration) {
                cancelError /** @type {!Error} */ = cancelError;
                const maybeEvent = registration.createCancelEvent(cancelError, path);
                if (maybeEvent) {
                    cancelEvents.push(maybeEvent);
                }
            });
        }
        if (eventRegistration) {
            let remaining = [];
            for (let i = 0; i < this.eventRegistrations_.length; ++i) {
                const existing = this.eventRegistrations_[i];
                if (!existing.matches(eventRegistration)) {
                    remaining.push(existing);
                }
                else if (eventRegistration.hasAnyCallback()) {
                    // We're removing just this one
                    remaining = remaining.concat(this.eventRegistrations_.slice(i + 1));
                    break;
                }
            }
            this.eventRegistrations_ = remaining;
        }
        else {
            this.eventRegistrations_ = [];
        }
        return cancelEvents;
    }
    /**
     * Applies the given Operation, updates our cache, and returns the appropriate events.
     *
     * @param {!Operation} operation
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} completeServerCache
     * @return {!Array.<!Event>}
     */
    applyOperation(operation, writesCache, completeServerCache) {
        if (operation.type === OperationType.MERGE &&
            operation.source.queryId !== null) {
            assert(this.viewCache_.getCompleteServerSnap(), 'We should always have a full cache before handling merges');
            assert(this.viewCache_.getCompleteEventSnap(), 'Missing event cache, even though we have a server cache');
        }
        const oldViewCache = this.viewCache_;
        const result = this.processor_.applyOperation(oldViewCache, operation, writesCache, completeServerCache);
        this.processor_.assertIndexed(result.viewCache);
        assert(result.viewCache.getServerCache().isFullyInitialized() ||
            !oldViewCache.getServerCache().isFullyInitialized(), 'Once a server snap is complete, it should never go back');
        this.viewCache_ = result.viewCache;
        return this.generateEventsForChanges_(result.changes, result.viewCache.getEventCache().getNode(), null);
    }
    /**
     * @param {!EventRegistration} registration
     * @return {!Array.<!Event>}
     */
    getInitialEvents(registration) {
        const eventSnap = this.viewCache_.getEventCache();
        const initialChanges = [];
        if (!eventSnap.getNode().isLeafNode()) {
            const eventNode = eventSnap.getNode();
            eventNode.forEachChild(PRIORITY_INDEX, function (key, childNode) {
                initialChanges.push(Change.childAddedChange(key, childNode));
            });
        }
        if (eventSnap.isFullyInitialized()) {
            initialChanges.push(Change.valueChange(eventSnap.getNode()));
        }
        return this.generateEventsForChanges_(initialChanges, eventSnap.getNode(), registration);
    }
    /**
     * @private
     * @param {!Array.<!Change>} changes
     * @param {!Node} eventCache
     * @param {EventRegistration=} eventRegistration
     * @return {!Array.<!Event>}
     */
    generateEventsForChanges_(changes, eventCache, eventRegistration) {
        const registrations = eventRegistration
            ? [eventRegistration]
            : this.eventRegistrations_;
        return this.eventGenerator_.generateEventsForChanges(changes, eventCache, registrations);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
let __referenceConstructor$1;
/**
 * SyncPoint represents a single location in a SyncTree with 1 or more event registrations, meaning we need to
 * maintain 1 or more Views at this location to cache server data and raise appropriate events for server changes
 * and user writes (set, transaction, update).
 *
 * It's responsible for:
 *  - Maintaining the set of 1 or more views necessary at this location (a SyncPoint with 0 views should be removed).
 *  - Proxying user / server operations to the views as appropriate (i.e. applyServerOverwrite,
 *    applyUserOverwrite, etc.)
 */
class SyncPoint {
    constructor() {
        /**
         * The Views being tracked at this location in the tree, stored as a map where the key is a
         * queryId and the value is the View for that query.
         *
         * NOTE: This list will be quite small (usually 1, but perhaps 2 or 3; any more is an odd use case).
         *
         * @type {!Object.<!string, !View>}
         * @private
         */
        this.views_ = {};
    }
    static set __referenceConstructor(val) {
        assert(!__referenceConstructor$1, '__referenceConstructor has already been defined');
        __referenceConstructor$1 = val;
    }
    static get __referenceConstructor() {
        assert(__referenceConstructor$1, 'Reference.ts has not been loaded');
        return __referenceConstructor$1;
    }
    /**
     * @return {boolean}
     */
    isEmpty() {
        return isEmpty(this.views_);
    }
    /**
     *
     * @param {!Operation} operation
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} optCompleteServerCache
     * @return {!Array.<!Event>}
     */
    applyOperation(operation, writesCache, optCompleteServerCache) {
        const queryId = operation.source.queryId;
        if (queryId !== null) {
            const view = safeGet(this.views_, queryId);
            assert(view != null, 'SyncTree gave us an op for an invalid query.');
            return view.applyOperation(operation, writesCache, optCompleteServerCache);
        }
        else {
            let events = [];
            forEach(this.views_, function (key, view) {
                events = events.concat(view.applyOperation(operation, writesCache, optCompleteServerCache));
            });
            return events;
        }
    }
    /**
     * Add an event callback for the specified query.
     *
     * @param {!Query} query
     * @param {!EventRegistration} eventRegistration
     * @param {!WriteTreeRef} writesCache
     * @param {?Node} serverCache Complete server cache, if we have it.
     * @param {boolean} serverCacheComplete
     * @return {!Array.<!Event>} Events to raise.
     */
    addEventRegistration(query, eventRegistration, writesCache, serverCache, serverCacheComplete) {
        const queryId = query.queryIdentifier();
        let view = safeGet(this.views_, queryId);
        if (!view) {
            // TODO: make writesCache take flag for complete server node
            let eventCache = writesCache.calcCompleteEventCache(serverCacheComplete ? serverCache : null);
            let eventCacheComplete = false;
            if (eventCache) {
                eventCacheComplete = true;
            }
            else if (serverCache instanceof ChildrenNode) {
                eventCache = writesCache.calcCompleteEventChildren(serverCache);
                eventCacheComplete = false;
            }
            else {
                eventCache = ChildrenNode.EMPTY_NODE;
                eventCacheComplete = false;
            }
            const viewCache = new ViewCache(new CacheNode(
            /** @type {!Node} */ (eventCache), eventCacheComplete, false), new CacheNode(
            /** @type {!Node} */ (serverCache), serverCacheComplete, false));
            view = new View(query, viewCache);
            this.views_[queryId] = view;
        }
        // This is guaranteed to exist now, we just created anything that was missing
        view.addEventRegistration(eventRegistration);
        return view.getInitialEvents(eventRegistration);
    }
    /**
     * Remove event callback(s).  Return cancelEvents if a cancelError is specified.
     *
     * If query is the default query, we'll check all views for the specified eventRegistration.
     * If eventRegistration is null, we'll remove all callbacks for the specified view(s).
     *
     * @param {!Query} query
     * @param {?EventRegistration} eventRegistration If null, remove all callbacks.
     * @param {Error=} cancelError If a cancelError is provided, appropriate cancel events will be returned.
     * @return {{removed:!Array.<!Query>, events:!Array.<!Event>}} removed queries and any cancel events
     */
    removeEventRegistration(query, eventRegistration, cancelError) {
        const queryId = query.queryIdentifier();
        const removed = [];
        let cancelEvents = [];
        const hadCompleteView = this.hasCompleteView();
        if (queryId === 'default') {
            // When you do ref.off(...), we search all views for the registration to remove.
            const self = this;
            forEach(this.views_, function (viewQueryId, view) {
                cancelEvents = cancelEvents.concat(view.removeEventRegistration(eventRegistration, cancelError));
                if (view.isEmpty()) {
                    delete self.views_[viewQueryId];
                    // We'll deal with complete views later.
                    if (!view
                        .getQuery()
                        .getQueryParams()
                        .loadsAllData()) {
                        removed.push(view.getQuery());
                    }
                }
            });
        }
        else {
            // remove the callback from the specific view.
            const view = safeGet(this.views_, queryId);
            if (view) {
                cancelEvents = cancelEvents.concat(view.removeEventRegistration(eventRegistration, cancelError));
                if (view.isEmpty()) {
                    delete this.views_[queryId];
                    // We'll deal with complete views later.
                    if (!view
                        .getQuery()
                        .getQueryParams()
                        .loadsAllData()) {
                        removed.push(view.getQuery());
                    }
                }
            }
        }
        if (hadCompleteView && !this.hasCompleteView()) {
            // We removed our last complete view.
            removed.push(new SyncPoint.__referenceConstructor(query.repo, query.path));
        }
        return { removed: removed, events: cancelEvents };
    }
    /**
     * @return {!Array.<!View>}
     */
    getQueryViews() {
        const values = Object.keys(this.views_).map(key => this.views_[key]);
        return values.filter(function (view) {
            return !view
                .getQuery()
                .getQueryParams()
                .loadsAllData();
        });
    }
    /**
     *
     * @param {!Path} path The path to the desired complete snapshot
     * @return {?Node} A complete cache, if it exists
     */
    getCompleteServerCache(path) {
        let serverCache = null;
        forEach(this.views_, (key, view) => {
            serverCache = serverCache || view.getCompleteServerCache(path);
        });
        return serverCache;
    }
    /**
     * @param {!Query} query
     * @return {?View}
     */
    viewForQuery(query) {
        const params = query.getQueryParams();
        if (params.loadsAllData()) {
            return this.getCompleteView();
        }
        else {
            const queryId = query.queryIdentifier();
            return safeGet(this.views_, queryId);
        }
    }
    /**
     * @param {!Query} query
     * @return {boolean}
     */
    viewExistsForQuery(query) {
        return this.viewForQuery(query) != null;
    }
    /**
     * @return {boolean}
     */
    hasCompleteView() {
        return this.getCompleteView() != null;
    }
    /**
     * @return {?View}
     */
    getCompleteView() {
        const completeView = findValue(this.views_, (view) => view
            .getQuery()
            .getQueryParams()
            .loadsAllData());
        return completeView || null;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * This class holds a collection of writes that can be applied to nodes in unison. It abstracts away the logic with
 * dealing with priority writes and multiple nested writes. At any given path there is only allowed to be one write
 * modifying that path. Any write to an existing path or shadowing an existing path will modify that existing write
 * to reflect the write added.
 *
 * @constructor
 * @param {!ImmutableTree.<!Node>} writeTree
 */
class CompoundWrite {
    constructor(writeTree_) {
        this.writeTree_ = writeTree_;
    }
    /**
     * @param {!Path} path
     * @param {!Node} node
     * @return {!CompoundWrite}
     */
    addWrite(path, node) {
        if (path.isEmpty()) {
            return new CompoundWrite(new ImmutableTree(node));
        }
        else {
            const rootmost = this.writeTree_.findRootMostValueAndPath(path);
            if (rootmost != null) {
                const rootMostPath = rootmost.path;
                let value = rootmost.value;
                const relativePath = Path.relativePath(rootMostPath, path);
                value = value.updateChild(relativePath, node);
                return new CompoundWrite(this.writeTree_.set(rootMostPath, value));
            }
            else {
                const subtree = new ImmutableTree(node);
                const newWriteTree = this.writeTree_.setTree(path, subtree);
                return new CompoundWrite(newWriteTree);
            }
        }
    }
    /**
     * @param {!Path} path
     * @param {!Object.<string, !Node>} updates
     * @return {!CompoundWrite}
     */
    addWrites(path, updates) {
        let newWrite = this;
        forEach(updates, function (childKey, node) {
            newWrite = newWrite.addWrite(path.child(childKey), node);
        });
        return newWrite;
    }
    /**
     * Will remove a write at the given path and deeper paths. This will <em>not</em> modify a write at a higher
     * location, which must be removed by calling this method with that path.
     *
     * @param {!Path} path The path at which a write and all deeper writes should be removed
     * @return {!CompoundWrite} The new CompoundWrite with the removed path
     */
    removeWrite(path) {
        if (path.isEmpty()) {
            return CompoundWrite.Empty;
        }
        else {
            const newWriteTree = this.writeTree_.setTree(path, ImmutableTree.Empty);
            return new CompoundWrite(newWriteTree);
        }
    }
    /**
     * Returns whether this CompoundWrite will fully overwrite a node at a given location and can therefore be
     * considered "complete".
     *
     * @param {!Path} path The path to check for
     * @return {boolean} Whether there is a complete write at that path
     */
    hasCompleteWrite(path) {
        return this.getCompleteNode(path) != null;
    }
    /**
     * Returns a node for a path if and only if the node is a "complete" overwrite at that path. This will not aggregate
     * writes from deeper paths, but will return child nodes from a more shallow path.
     *
     * @param {!Path} path The path to get a complete write
     * @return {?Node} The node if complete at that path, or null otherwise.
     */
    getCompleteNode(path) {
        const rootmost = this.writeTree_.findRootMostValueAndPath(path);
        if (rootmost != null) {
            return this.writeTree_
                .get(rootmost.path)
                .getChild(Path.relativePath(rootmost.path, path));
        }
        else {
            return null;
        }
    }
    /**
     * Returns all children that are guaranteed to be a complete overwrite.
     *
     * @return {!Array.<NamedNode>} A list of all complete children.
     */
    getCompleteChildren() {
        const children = [];
        let node = this.writeTree_.value;
        if (node != null) {
            // If it's a leaf node, it has no children; so nothing to do.
            if (!node.isLeafNode()) {
                node.forEachChild(PRIORITY_INDEX, function (childName, childNode) {
                    children.push(new NamedNode(childName, childNode));
                });
            }
        }
        else {
            this.writeTree_.children.inorderTraversal(function (childName, childTree) {
                if (childTree.value != null) {
                    children.push(new NamedNode(childName, childTree.value));
                }
            });
        }
        return children;
    }
    /**
     * @param {!Path} path
     * @return {!CompoundWrite}
     */
    childCompoundWrite(path) {
        if (path.isEmpty()) {
            return this;
        }
        else {
            const shadowingNode = this.getCompleteNode(path);
            if (shadowingNode != null) {
                return new CompoundWrite(new ImmutableTree(shadowingNode));
            }
            else {
                return new CompoundWrite(this.writeTree_.subtree(path));
            }
        }
    }
    /**
     * Returns true if this CompoundWrite is empty and therefore does not modify any nodes.
     * @return {boolean} Whether this CompoundWrite is empty
     */
    isEmpty() {
        return this.writeTree_.isEmpty();
    }
    /**
     * Applies this CompoundWrite to a node. The node is returned with all writes from this CompoundWrite applied to the
     * node
     * @param {!Node} node The node to apply this CompoundWrite to
     * @return {!Node} The node with all writes applied
     */
    apply(node) {
        return CompoundWrite.applySubtreeWrite_(Path.Empty, this.writeTree_, node);
    }
}
/**
 * @type {!CompoundWrite}
 */
CompoundWrite.Empty = new CompoundWrite(new ImmutableTree(null));
/**
 * @param {!Path} relativePath
 * @param {!ImmutableTree.<!Node>} writeTree
 * @param {!Node} node
 * @return {!Node}
 * @private
 */
CompoundWrite.applySubtreeWrite_ = function (relativePath, writeTree, node) {
    if (writeTree.value != null) {
        // Since there a write is always a leaf, we're done here
        return node.updateChild(relativePath, writeTree.value);
    }
    else {
        let priorityWrite = null;
        writeTree.children.inorderTraversal(function (childKey, childTree) {
            if (childKey === '.priority') {
                // Apply priorities at the end so we don't update priorities for either empty nodes or forget
                // to apply priorities to empty nodes that are later filled
                assert(childTree.value !== null, 'Priority writes must always be leaf nodes');
                priorityWrite = childTree.value;
            }
            else {
                node = CompoundWrite.applySubtreeWrite_(relativePath.child(childKey), childTree, node);
            }
        });
        // If there was a priority write, we only apply it if the node is not empty
        if (!node.getChild(relativePath).isEmpty() && priorityWrite !== null) {
            node = node.updateChild(relativePath.child('.priority'), priorityWrite);
        }
        return node;
    }
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * WriteTree tracks all pending user-initiated writes and has methods to calculate the result of merging them
 * with underlying server data (to create "event cache" data).  Pending writes are added with addOverwrite()
 * and addMerge(), and removed with removeWrite().
 *
 * @constructor
 */
class WriteTree {
    constructor() {
        /**
         * A tree tracking the result of applying all visible writes.  This does not include transactions with
         * applyLocally=false or writes that are completely shadowed by other writes.
         *
         * @type {!CompoundWrite}
         * @private
         */
        this.visibleWrites_ = CompoundWrite.Empty;
        /**
         * A list of all pending writes, regardless of visibility and shadowed-ness.  Used to calculate arbitrary
         * sets of the changed data, such as hidden writes (from transactions) or changes with certain writes excluded (also
         * used by transactions).
         *
         * @type {!Array.<!WriteRecord>}
         * @private
         */
        this.allWrites_ = [];
        this.lastWriteId_ = -1;
    }
    /**
     * Create a new WriteTreeRef for the given path. For use with a new sync point at the given path.
     *
     * @param {!Path} path
     * @return {!WriteTreeRef}
     */
    childWrites(path) {
        return new WriteTreeRef(path, this);
    }
    /**
     * Record a new overwrite from user code.
     *
     * @param {!Path} path
     * @param {!Node} snap
     * @param {!number} writeId
     * @param {boolean=} visible This is set to false by some transactions. It should be excluded from event caches
     */
    addOverwrite(path, snap, writeId, visible) {
        assert(writeId > this.lastWriteId_, 'Stacking an older write on top of newer ones');
        if (visible === undefined) {
            visible = true;
        }
        this.allWrites_.push({
            path: path,
            snap: snap,
            writeId: writeId,
            visible: visible
        });
        if (visible) {
            this.visibleWrites_ = this.visibleWrites_.addWrite(path, snap);
        }
        this.lastWriteId_ = writeId;
    }
    /**
     * Record a new merge from user code.
     *
     * @param {!Path} path
     * @param {!Object.<string, !Node>} changedChildren
     * @param {!number} writeId
     */
    addMerge(path, changedChildren, writeId) {
        assert(writeId > this.lastWriteId_, 'Stacking an older merge on top of newer ones');
        this.allWrites_.push({
            path: path,
            children: changedChildren,
            writeId: writeId,
            visible: true
        });
        this.visibleWrites_ = this.visibleWrites_.addWrites(path, changedChildren);
        this.lastWriteId_ = writeId;
    }
    /**
     * @param {!number} writeId
     * @return {?WriteRecord}
     */
    getWrite(writeId) {
        for (let i = 0; i < this.allWrites_.length; i++) {
            const record = this.allWrites_[i];
            if (record.writeId === writeId) {
                return record;
            }
        }
        return null;
    }
    /**
     * Remove a write (either an overwrite or merge) that has been successfully acknowledge by the server. Recalculates
     * the tree if necessary.  We return true if it may have been visible, meaning views need to reevaluate.
     *
     * @param {!number} writeId
     * @return {boolean} true if the write may have been visible (meaning we'll need to reevaluate / raise
     * events as a result).
     */
    removeWrite(writeId) {
        // Note: disabling this check. It could be a transaction that preempted another transaction, and thus was applied
        // out of order.
        //const validClear = revert || this.allWrites_.length === 0 || writeId <= this.allWrites_[0].writeId;
        //assert(validClear, "Either we don't have this write, or it's the first one in the queue");
        const idx = this.allWrites_.findIndex(function (s) {
            return s.writeId === writeId;
        });
        assert(idx >= 0, 'removeWrite called with nonexistent writeId.');
        const writeToRemove = this.allWrites_[idx];
        this.allWrites_.splice(idx, 1);
        let removedWriteWasVisible = writeToRemove.visible;
        let removedWriteOverlapsWithOtherWrites = false;
        let i = this.allWrites_.length - 1;
        while (removedWriteWasVisible && i >= 0) {
            const currentWrite = this.allWrites_[i];
            if (currentWrite.visible) {
                if (i >= idx &&
                    this.recordContainsPath_(currentWrite, writeToRemove.path)) {
                    // The removed write was completely shadowed by a subsequent write.
                    removedWriteWasVisible = false;
                }
                else if (writeToRemove.path.contains(currentWrite.path)) {
                    // Either we're covering some writes or they're covering part of us (depending on which came first).
                    removedWriteOverlapsWithOtherWrites = true;
                }
            }
            i--;
        }
        if (!removedWriteWasVisible) {
            return false;
        }
        else if (removedWriteOverlapsWithOtherWrites) {
            // There's some shadowing going on. Just rebuild the visible writes from scratch.
            this.resetTree_();
            return true;
        }
        else {
            // There's no shadowing.  We can safely just remove the write(s) from visibleWrites.
            if (writeToRemove.snap) {
                this.visibleWrites_ = this.visibleWrites_.removeWrite(writeToRemove.path);
            }
            else {
                const children = writeToRemove.children;
                forEach(children, (childName) => {
                    this.visibleWrites_ = this.visibleWrites_.removeWrite(writeToRemove.path.child(childName));
                });
            }
            return true;
        }
    }
    /**
     * Return a complete snapshot for the given path if there's visible write data at that path, else null.
     * No server data is considered.
     *
     * @param {!Path} path
     * @return {?Node}
     */
    getCompleteWriteData(path) {
        return this.visibleWrites_.getCompleteNode(path);
    }
    /**
     * Given optional, underlying server data, and an optional set of constraints (exclude some sets, include hidden
     * writes), attempt to calculate a complete snapshot for the given path
     *
     * @param {!Path} treePath
     * @param {?Node} completeServerCache
     * @param {Array.<number>=} writeIdsToExclude An optional set to be excluded
     * @param {boolean=} includeHiddenWrites Defaults to false, whether or not to layer on writes with visible set to false
     * @return {?Node}
     */
    calcCompleteEventCache(treePath, completeServerCache, writeIdsToExclude, includeHiddenWrites) {
        if (!writeIdsToExclude && !includeHiddenWrites) {
            const shadowingNode = this.visibleWrites_.getCompleteNode(treePath);
            if (shadowingNode != null) {
                return shadowingNode;
            }
            else {
                const subMerge = this.visibleWrites_.childCompoundWrite(treePath);
                if (subMerge.isEmpty()) {
                    return completeServerCache;
                }
                else if (completeServerCache == null &&
                    !subMerge.hasCompleteWrite(Path.Empty)) {
                    // We wouldn't have a complete snapshot, since there's no underlying data and no complete shadow
                    return null;
                }
                else {
                    const layeredCache = completeServerCache || ChildrenNode.EMPTY_NODE;
                    return subMerge.apply(layeredCache);
                }
            }
        }
        else {
            const merge = this.visibleWrites_.childCompoundWrite(treePath);
            if (!includeHiddenWrites && merge.isEmpty()) {
                return completeServerCache;
            }
            else {
                // If the server cache is null, and we don't have a complete cache, we need to return null
                if (!includeHiddenWrites &&
                    completeServerCache == null &&
                    !merge.hasCompleteWrite(Path.Empty)) {
                    return null;
                }
                else {
                    const filter = function (write) {
                        return ((write.visible || includeHiddenWrites) &&
                            (!writeIdsToExclude ||
                                !~writeIdsToExclude.indexOf(write.writeId)) &&
                            (write.path.contains(treePath) || treePath.contains(write.path)));
                    };
                    const mergeAtPath = WriteTree.layerTree_(this.allWrites_, filter, treePath);
                    const layeredCache = completeServerCache || ChildrenNode.EMPTY_NODE;
                    return mergeAtPath.apply(layeredCache);
                }
            }
        }
    }
    /**
     * With optional, underlying server data, attempt to return a children node of children that we have complete data for.
     * Used when creating new views, to pre-fill their complete event children snapshot.
     *
     * @param {!Path} treePath
     * @param {?ChildrenNode} completeServerChildren
     * @return {!ChildrenNode}
     */
    calcCompleteEventChildren(treePath, completeServerChildren) {
        let completeChildren = ChildrenNode.EMPTY_NODE;
        const topLevelSet = this.visibleWrites_.getCompleteNode(treePath);
        if (topLevelSet) {
            if (!topLevelSet.isLeafNode()) {
                // we're shadowing everything. Return the children.
                topLevelSet.forEachChild(PRIORITY_INDEX, function (childName, childSnap) {
                    completeChildren = completeChildren.updateImmediateChild(childName, childSnap);
                });
            }
            return completeChildren;
        }
        else if (completeServerChildren) {
            // Layer any children we have on top of this
            // We know we don't have a top-level set, so just enumerate existing children
            const merge = this.visibleWrites_.childCompoundWrite(treePath);
            completeServerChildren.forEachChild(PRIORITY_INDEX, function (childName, childNode) {
                const node = merge
                    .childCompoundWrite(new Path(childName))
                    .apply(childNode);
                completeChildren = completeChildren.updateImmediateChild(childName, node);
            });
            // Add any complete children we have from the set
            merge.getCompleteChildren().forEach(function (namedNode) {
                completeChildren = completeChildren.updateImmediateChild(namedNode.name, namedNode.node);
            });
            return completeChildren;
        }
        else {
            // We don't have anything to layer on top of. Layer on any children we have
            // Note that we can return an empty snap if we have a defined delete
            const merge = this.visibleWrites_.childCompoundWrite(treePath);
            merge.getCompleteChildren().forEach(function (namedNode) {
                completeChildren = completeChildren.updateImmediateChild(namedNode.name, namedNode.node);
            });
            return completeChildren;
        }
    }
    /**
     * Given that the underlying server data has updated, determine what, if anything, needs to be
     * applied to the event cache.
     *
     * Possibilities:
     *
     * 1. No writes are shadowing. Events should be raised, the snap to be applied comes from the server data
     *
     * 2. Some write is completely shadowing. No events to be raised
     *
     * 3. Is partially shadowed. Events
     *
     * Either existingEventSnap or existingServerSnap must exist
     *
     * @param {!Path} treePath
     * @param {!Path} childPath
     * @param {?Node} existingEventSnap
     * @param {?Node} existingServerSnap
     * @return {?Node}
     */
    calcEventCacheAfterServerOverwrite(treePath, childPath, existingEventSnap, existingServerSnap) {
        assert(existingEventSnap || existingServerSnap, 'Either existingEventSnap or existingServerSnap must exist');
        const path = treePath.child(childPath);
        if (this.visibleWrites_.hasCompleteWrite(path)) {
            // At this point we can probably guarantee that we're in case 2, meaning no events
            // May need to check visibility while doing the findRootMostValueAndPath call
            return null;
        }
        else {
            // No complete shadowing. We're either partially shadowing or not shadowing at all.
            const childMerge = this.visibleWrites_.childCompoundWrite(path);
            if (childMerge.isEmpty()) {
                // We're not shadowing at all. Case 1
                return existingServerSnap.getChild(childPath);
            }
            else {
                // This could be more efficient if the serverNode + updates doesn't change the eventSnap
                // However this is tricky to find out, since user updates don't necessary change the server
                // snap, e.g. priority updates on empty nodes, or deep deletes. Another special case is if the server
                // adds nodes, but doesn't change any existing writes. It is therefore not enough to
                // only check if the updates change the serverNode.
                // Maybe check if the merge tree contains these special cases and only do a full overwrite in that case?
                return childMerge.apply(existingServerSnap.getChild(childPath));
            }
        }
    }
    /**
     * Returns a complete child for a given server snap after applying all user writes or null if there is no
     * complete child for this ChildKey.
     *
     * @param {!Path} treePath
     * @param {!string} childKey
     * @param {!CacheNode} existingServerSnap
     * @return {?Node}
     */
    calcCompleteChild(treePath, childKey, existingServerSnap) {
        const path = treePath.child(childKey);
        const shadowingNode = this.visibleWrites_.getCompleteNode(path);
        if (shadowingNode != null) {
            return shadowingNode;
        }
        else {
            if (existingServerSnap.isCompleteForChild(childKey)) {
                const childMerge = this.visibleWrites_.childCompoundWrite(path);
                return childMerge.apply(existingServerSnap.getNode().getImmediateChild(childKey));
            }
            else {
                return null;
            }
        }
    }
    /**
     * Returns a node if there is a complete overwrite for this path. More specifically, if there is a write at
     * a higher path, this will return the child of that write relative to the write and this path.
     * Returns null if there is no write at this path.
     *
     * @param {!Path} path
     * @return {?Node}
     */
    shadowingWrite(path) {
        return this.visibleWrites_.getCompleteNode(path);
    }
    /**
     * This method is used when processing child remove events on a query. If we can, we pull in children that were outside
     * the window, but may now be in the window.
     *
     * @param {!Path} treePath
     * @param {?Node} completeServerData
     * @param {!NamedNode} startPost
     * @param {!number} count
     * @param {boolean} reverse
     * @param {!Index} index
     * @return {!Array.<!NamedNode>}
     */
    calcIndexedSlice(treePath, completeServerData, startPost, count, reverse, index) {
        let toIterate;
        const merge = this.visibleWrites_.childCompoundWrite(treePath);
        const shadowingNode = merge.getCompleteNode(Path.Empty);
        if (shadowingNode != null) {
            toIterate = shadowingNode;
        }
        else if (completeServerData != null) {
            toIterate = merge.apply(completeServerData);
        }
        else {
            // no children to iterate on
            return [];
        }
        toIterate = toIterate.withIndex(index);
        if (!toIterate.isEmpty() && !toIterate.isLeafNode()) {
            const nodes = [];
            const cmp = index.getCompare();
            const iter = reverse
                ? toIterate.getReverseIteratorFrom(startPost, index)
                : toIterate.getIteratorFrom(startPost, index);
            let next = iter.getNext();
            while (next && nodes.length < count) {
                if (cmp(next, startPost) !== 0) {
                    nodes.push(next);
                }
                next = iter.getNext();
            }
            return nodes;
        }
        else {
            return [];
        }
    }
    /**
     * @param {!WriteRecord} writeRecord
     * @param {!Path} path
     * @return {boolean}
     * @private
     */
    recordContainsPath_(writeRecord, path) {
        if (writeRecord.snap) {
            return writeRecord.path.contains(path);
        }
        else {
            // findKey can return undefined, so use !! to coerce to boolean
            return !!findKey(writeRecord.children, function (childSnap, childName) {
                return writeRecord.path.child(childName).contains(path);
            });
        }
    }
    /**
     * Re-layer the writes and merges into a tree so we can efficiently calculate event snapshots
     * @private
     */
    resetTree_() {
        this.visibleWrites_ = WriteTree.layerTree_(this.allWrites_, WriteTree.DefaultFilter_, Path.Empty);
        if (this.allWrites_.length > 0) {
            this.lastWriteId_ = this.allWrites_[this.allWrites_.length - 1].writeId;
        }
        else {
            this.lastWriteId_ = -1;
        }
    }
    /**
     * The default filter used when constructing the tree. Keep everything that's visible.
     *
     * @param {!WriteRecord} write
     * @return {boolean}
     * @private
     */
    static DefaultFilter_(write) {
        return write.visible;
    }
    /**
     * Static method. Given an array of WriteRecords, a filter for which ones to include, and a path, construct the tree of
     * event data at that path.
     *
     * @param {!Array.<!WriteRecord>} writes
     * @param {!function(!WriteRecord):boolean} filter
     * @param {!Path} treeRoot
     * @return {!CompoundWrite}
     * @private
     */
    static layerTree_(writes, filter, treeRoot) {
        let compoundWrite = CompoundWrite.Empty;
        for (let i = 0; i < writes.length; ++i) {
            const write = writes[i];
            // Theory, a later set will either:
            // a) abort a relevant transaction, so no need to worry about excluding it from calculating that transaction
            // b) not be relevant to a transaction (separate branch), so again will not affect the data for that transaction
            if (filter(write)) {
                const writePath = write.path;
                let relativePath;
                if (write.snap) {
                    if (treeRoot.contains(writePath)) {
                        relativePath = Path.relativePath(treeRoot, writePath);
                        compoundWrite = compoundWrite.addWrite(relativePath, write.snap);
                    }
                    else if (writePath.contains(treeRoot)) {
                        relativePath = Path.relativePath(writePath, treeRoot);
                        compoundWrite = compoundWrite.addWrite(Path.Empty, write.snap.getChild(relativePath));
                    }
                }
                else if (write.children) {
                    if (treeRoot.contains(writePath)) {
                        relativePath = Path.relativePath(treeRoot, writePath);
                        compoundWrite = compoundWrite.addWrites(relativePath, write.children);
                    }
                    else if (writePath.contains(treeRoot)) {
                        relativePath = Path.relativePath(writePath, treeRoot);
                        if (relativePath.isEmpty()) {
                            compoundWrite = compoundWrite.addWrites(Path.Empty, write.children);
                        }
                        else {
                            const child = safeGet(write.children, relativePath.getFront());
                            if (child) {
                                // There exists a child in this node that matches the root path
                                const deepNode = child.getChild(relativePath.popFront());
                                compoundWrite = compoundWrite.addWrite(Path.Empty, deepNode);
                            }
                        }
                    }
                }
                else {
                    throw assertionError('WriteRecord should have .snap or .children');
                }
            }
        }
        return compoundWrite;
    }
}
/**
 * A WriteTreeRef wraps a WriteTree and a path, for convenient access to a particular subtree.  All of the methods
 * just proxy to the underlying WriteTree.
 *
 * @constructor
 */
class WriteTreeRef {
    /**
     * @param {!Path} path
     * @param {!WriteTree} writeTree
     */
    constructor(path, writeTree) {
        this.treePath_ = path;
        this.writeTree_ = writeTree;
    }
    /**
     * If possible, returns a complete event cache, using the underlying server data if possible. In addition, can be used
     * to get a cache that includes hidden writes, and excludes arbitrary writes. Note that customizing the returned node
     * can lead to a more expensive calculation.
     *
     * @param {?Node} completeServerCache
     * @param {Array.<number>=} writeIdsToExclude Optional writes to exclude.
     * @param {boolean=} includeHiddenWrites Defaults to false, whether or not to layer on writes with visible set to false
     * @return {?Node}
     */
    calcCompleteEventCache(completeServerCache, writeIdsToExclude, includeHiddenWrites) {
        return this.writeTree_.calcCompleteEventCache(this.treePath_, completeServerCache, writeIdsToExclude, includeHiddenWrites);
    }
    /**
     * If possible, returns a children node containing all of the complete children we have data for. The returned data is a
     * mix of the given server data and write data.
     *
     * @param {?ChildrenNode} completeServerChildren
     * @return {!ChildrenNode}
     */
    calcCompleteEventChildren(completeServerChildren) {
        return this.writeTree_.calcCompleteEventChildren(this.treePath_, completeServerChildren);
    }
    /**
     * Given that either the underlying server data has updated or the outstanding writes have updated, determine what,
     * if anything, needs to be applied to the event cache.
     *
     * Possibilities:
     *
     * 1. No writes are shadowing. Events should be raised, the snap to be applied comes from the server data
     *
     * 2. Some write is completely shadowing. No events to be raised
     *
     * 3. Is partially shadowed. Events should be raised
     *
     * Either existingEventSnap or existingServerSnap must exist, this is validated via an assert
     *
     * @param {!Path} path
     * @param {?Node} existingEventSnap
     * @param {?Node} existingServerSnap
     * @return {?Node}
     */
    calcEventCacheAfterServerOverwrite(path, existingEventSnap, existingServerSnap) {
        return this.writeTree_.calcEventCacheAfterServerOverwrite(this.treePath_, path, existingEventSnap, existingServerSnap);
    }
    /**
     * Returns a node if there is a complete overwrite for this path. More specifically, if there is a write at
     * a higher path, this will return the child of that write relative to the write and this path.
     * Returns null if there is no write at this path.
     *
     * @param {!Path} path
     * @return {?Node}
     */
    shadowingWrite(path) {
        return this.writeTree_.shadowingWrite(this.treePath_.child(path));
    }
    /**
     * This method is used when processing child remove events on a query. If we can, we pull in children that were outside
     * the window, but may now be in the window
     *
     * @param {?Node} completeServerData
     * @param {!NamedNode} startPost
     * @param {!number} count
     * @param {boolean} reverse
     * @param {!Index} index
     * @return {!Array.<!NamedNode>}
     */
    calcIndexedSlice(completeServerData, startPost, count, reverse, index) {
        return this.writeTree_.calcIndexedSlice(this.treePath_, completeServerData, startPost, count, reverse, index);
    }
    /**
     * Returns a complete child for a given server snap after applying all user writes or null if there is no
     * complete child for this ChildKey.
     *
     * @param {!string} childKey
     * @param {!CacheNode} existingServerCache
     * @return {?Node}
     */
    calcCompleteChild(childKey, existingServerCache) {
        return this.writeTree_.calcCompleteChild(this.treePath_, childKey, existingServerCache);
    }
    /**
     * Return a WriteTreeRef for a child.
     *
     * @param {string} childName
     * @return {!WriteTreeRef}
     */
    child(childName) {
        return new WriteTreeRef(this.treePath_.child(childName), this.writeTree_);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * SyncTree is the central class for managing event callback registration, data caching, views
 * (query processing), and event generation.  There are typically two SyncTree instances for
 * each Repo, one for the normal Firebase data, and one for the .info data.
 *
 * It has a number of responsibilities, including:
 *  - Tracking all user event callbacks (registered via addEventRegistration() and removeEventRegistration()).
 *  - Applying and caching data changes for user set(), transaction(), and update() calls
 *    (applyUserOverwrite(), applyUserMerge()).
 *  - Applying and caching data changes for server data changes (applyServerOverwrite(),
 *    applyServerMerge()).
 *  - Generating user-facing events for server and user changes (all of the apply* methods
 *    return the set of events that need to be raised as a result).
 *  - Maintaining the appropriate set of server listens to ensure we are always subscribed
 *    to the correct set of paths and queries to satisfy the current set of user event
 *    callbacks (listens are started/stopped using the provided listenProvider).
 *
 * NOTE: Although SyncTree tracks event callbacks and calculates events to raise, the actual
 * events are returned to the caller rather than raised synchronously.
 *
 * @constructor
 */
class SyncTree {
    /**
     * @param {!ListenProvider} listenProvider_ Used by SyncTree to start / stop listening
     *   to server data.
     */
    constructor(listenProvider_) {
        this.listenProvider_ = listenProvider_;
        /**
         * Tree of SyncPoints.  There's a SyncPoint at any location that has 1 or more views.
         * @type {!ImmutableTree.<!SyncPoint>}
         * @private
         */
        this.syncPointTree_ = ImmutableTree.Empty;
        /**
         * A tree of all pending user writes (user-initiated set()'s, transaction()'s, update()'s, etc.).
         * @type {!WriteTree}
         * @private
         */
        this.pendingWriteTree_ = new WriteTree();
        this.tagToQueryMap_ = {};
        this.queryToTagMap_ = {};
    }
    /**
     * Apply the data changes for a user-generated set() or transaction() call.
     *
     * @param {!Path} path
     * @param {!Node} newData
     * @param {number} writeId
     * @param {boolean=} visible
     * @return {!Array.<!Event>} Events to raise.
     */
    applyUserOverwrite(path, newData, writeId, visible) {
        // Record pending write.
        this.pendingWriteTree_.addOverwrite(path, newData, writeId, visible);
        if (!visible) {
            return [];
        }
        else {
            return this.applyOperationToSyncPoints_(new Overwrite(OperationSource.User, path, newData));
        }
    }
    /**
     * Apply the data from a user-generated update() call
     *
     * @param {!Path} path
     * @param {!Object.<string, !Node>} changedChildren
     * @param {!number} writeId
     * @return {!Array.<!Event>} Events to raise.
     */
    applyUserMerge(path, changedChildren, writeId) {
        // Record pending merge.
        this.pendingWriteTree_.addMerge(path, changedChildren, writeId);
        const changeTree = ImmutableTree.fromObject(changedChildren);
        return this.applyOperationToSyncPoints_(new Merge(OperationSource.User, path, changeTree));
    }
    /**
     * Acknowledge a pending user write that was previously registered with applyUserOverwrite() or applyUserMerge().
     *
     * @param {!number} writeId
     * @param {boolean=} revert True if the given write failed and needs to be reverted
     * @return {!Array.<!Event>} Events to raise.
     */
    ackUserWrite(writeId, revert = false) {
        const write = this.pendingWriteTree_.getWrite(writeId);
        const needToReevaluate = this.pendingWriteTree_.removeWrite(writeId);
        if (!needToReevaluate) {
            return [];
        }
        else {
            let affectedTree = ImmutableTree.Empty;
            if (write.snap != null) {
                // overwrite
                affectedTree = affectedTree.set(Path.Empty, true);
            }
            else {
                forEach(write.children, function (pathString, node) {
                    affectedTree = affectedTree.set(new Path(pathString), node);
                });
            }
            return this.applyOperationToSyncPoints_(new AckUserWrite(write.path, affectedTree, revert));
        }
    }
    /**
     * Apply new server data for the specified path..
     *
     * @param {!Path} path
     * @param {!Node} newData
     * @return {!Array.<!Event>} Events to raise.
     */
    applyServerOverwrite(path, newData) {
        return this.applyOperationToSyncPoints_(new Overwrite(OperationSource.Server, path, newData));
    }
    /**
     * Apply new server data to be merged in at the specified path.
     *
     * @param {!Path} path
     * @param {!Object.<string, !Node>} changedChildren
     * @return {!Array.<!Event>} Events to raise.
     */
    applyServerMerge(path, changedChildren) {
        const changeTree = ImmutableTree.fromObject(changedChildren);
        return this.applyOperationToSyncPoints_(new Merge(OperationSource.Server, path, changeTree));
    }
    /**
     * Apply a listen complete for a query
     *
     * @param {!Path} path
     * @return {!Array.<!Event>} Events to raise.
     */
    applyListenComplete(path) {
        return this.applyOperationToSyncPoints_(new ListenComplete(OperationSource.Server, path));
    }
    /**
     * Apply new server data for the specified tagged query.
     *
     * @param {!Path} path
     * @param {!Node} snap
     * @param {!number} tag
     * @return {!Array.<!Event>} Events to raise.
     */
    applyTaggedQueryOverwrite(path, snap, tag) {
        const queryKey = this.queryKeyForTag_(tag);
        if (queryKey != null) {
            const r = SyncTree.parseQueryKey_(queryKey);
            const queryPath = r.path, queryId = r.queryId;
            const relativePath = Path.relativePath(queryPath, path);
            const op = new Overwrite(OperationSource.forServerTaggedQuery(queryId), relativePath, snap);
            return this.applyTaggedOperation_(queryPath, op);
        }
        else {
            // Query must have been removed already
            return [];
        }
    }
    /**
     * Apply server data to be merged in for the specified tagged query.
     *
     * @param {!Path} path
     * @param {!Object.<string, !Node>} changedChildren
     * @param {!number} tag
     * @return {!Array.<!Event>} Events to raise.
     */
    applyTaggedQueryMerge(path, changedChildren, tag) {
        const queryKey = this.queryKeyForTag_(tag);
        if (queryKey) {
            const r = SyncTree.parseQueryKey_(queryKey);
            const queryPath = r.path, queryId = r.queryId;
            const relativePath = Path.relativePath(queryPath, path);
            const changeTree = ImmutableTree.fromObject(changedChildren);
            const op = new Merge(OperationSource.forServerTaggedQuery(queryId), relativePath, changeTree);
            return this.applyTaggedOperation_(queryPath, op);
        }
        else {
            // We've already removed the query. No big deal, ignore the update
            return [];
        }
    }
    /**
     * Apply a listen complete for a tagged query
     *
     * @param {!Path} path
     * @param {!number} tag
     * @return {!Array.<!Event>} Events to raise.
     */
    applyTaggedListenComplete(path, tag) {
        const queryKey = this.queryKeyForTag_(tag);
        if (queryKey) {
            const r = SyncTree.parseQueryKey_(queryKey);
            const queryPath = r.path, queryId = r.queryId;
            const relativePath = Path.relativePath(queryPath, path);
            const op = new ListenComplete(OperationSource.forServerTaggedQuery(queryId), relativePath);
            return this.applyTaggedOperation_(queryPath, op);
        }
        else {
            // We've already removed the query. No big deal, ignore the update
            return [];
        }
    }
    /**
     * Add an event callback for the specified query.
     *
     * @param {!Query} query
     * @param {!EventRegistration} eventRegistration
     * @return {!Array.<!Event>} Events to raise.
     */
    addEventRegistration(query, eventRegistration) {
        const path = query.path;
        let serverCache = null;
        let foundAncestorDefaultView = false;
        // Any covering writes will necessarily be at the root, so really all we need to find is the server cache.
        // Consider optimizing this once there's a better understanding of what actual behavior will be.
        this.syncPointTree_.foreachOnPath(path, function (pathToSyncPoint, sp) {
            const relativePath = Path.relativePath(pathToSyncPoint, path);
            serverCache = serverCache || sp.getCompleteServerCache(relativePath);
            foundAncestorDefaultView =
                foundAncestorDefaultView || sp.hasCompleteView();
        });
        let syncPoint = this.syncPointTree_.get(path);
        if (!syncPoint) {
            syncPoint = new SyncPoint();
            this.syncPointTree_ = this.syncPointTree_.set(path, syncPoint);
        }
        else {
            foundAncestorDefaultView =
                foundAncestorDefaultView || syncPoint.hasCompleteView();
            serverCache = serverCache || syncPoint.getCompleteServerCache(Path.Empty);
        }
        let serverCacheComplete;
        if (serverCache != null) {
            serverCacheComplete = true;
        }
        else {
            serverCacheComplete = false;
            serverCache = ChildrenNode.EMPTY_NODE;
            const subtree = this.syncPointTree_.subtree(path);
            subtree.foreachChild(function (childName, childSyncPoint) {
                const completeCache = childSyncPoint.getCompleteServerCache(Path.Empty);
                if (completeCache) {
                    serverCache = serverCache.updateImmediateChild(childName, completeCache);
                }
            });
        }
        const viewAlreadyExists = syncPoint.viewExistsForQuery(query);
        if (!viewAlreadyExists && !query.getQueryParams().loadsAllData()) {
            // We need to track a tag for this query
            const queryKey = SyncTree.makeQueryKey_(query);
            assert(!(queryKey in this.queryToTagMap_), 'View does not exist, but we have a tag');
            const tag = SyncTree.getNextQueryTag_();
            this.queryToTagMap_[queryKey] = tag;
            // Coerce to string to avoid sparse arrays.
            this.tagToQueryMap_['_' + tag] = queryKey;
        }
        const writesCache = this.pendingWriteTree_.childWrites(path);
        let events = syncPoint.addEventRegistration(query, eventRegistration, writesCache, serverCache, serverCacheComplete);
        if (!viewAlreadyExists && !foundAncestorDefaultView) {
            const view /** @type !View */ = syncPoint.viewForQuery(query);
            events = events.concat(this.setupListener_(query, view));
        }
        return events;
    }
    /**
     * Remove event callback(s).
     *
     * If query is the default query, we'll check all queries for the specified eventRegistration.
     * If eventRegistration is null, we'll remove all callbacks for the specified query/queries.
     *
     * @param {!Query} query
     * @param {?EventRegistration} eventRegistration If null, all callbacks are removed.
     * @param {Error=} cancelError If a cancelError is provided, appropriate cancel events will be returned.
     * @return {!Array.<!Event>} Cancel events, if cancelError was provided.
     */
    removeEventRegistration(query, eventRegistration, cancelError) {
        // Find the syncPoint first. Then deal with whether or not it has matching listeners
        const path = query.path;
        const maybeSyncPoint = this.syncPointTree_.get(path);
        let cancelEvents = [];
        // A removal on a default query affects all queries at that location. A removal on an indexed query, even one without
        // other query constraints, does *not* affect all queries at that location. So this check must be for 'default', and
        // not loadsAllData().
        if (maybeSyncPoint &&
            (query.queryIdentifier() === 'default' ||
                maybeSyncPoint.viewExistsForQuery(query))) {
            /**
             * @type {{removed: !Array.<!Query>, events: !Array.<!Event>}}
             */
            const removedAndEvents = maybeSyncPoint.removeEventRegistration(query, eventRegistration, cancelError);
            if (maybeSyncPoint.isEmpty()) {
                this.syncPointTree_ = this.syncPointTree_.remove(path);
            }
            const removed = removedAndEvents.removed;
            cancelEvents = removedAndEvents.events;
            // We may have just removed one of many listeners and can short-circuit this whole process
            // We may also not have removed a default listener, in which case all of the descendant listeners should already be
            // properly set up.
            //
            // Since indexed queries can shadow if they don't have other query constraints, check for loadsAllData(), instead of
            // queryId === 'default'
            const removingDefault = -1 !==
                removed.findIndex(function (query) {
                    return query.getQueryParams().loadsAllData();
                });
            const covered = this.syncPointTree_.findOnPath(path, function (relativePath, parentSyncPoint) {
                return parentSyncPoint.hasCompleteView();
            });
            if (removingDefault && !covered) {
                const subtree = this.syncPointTree_.subtree(path);
                // There are potentially child listeners. Determine what if any listens we need to send before executing the
                // removal
                if (!subtree.isEmpty()) {
                    // We need to fold over our subtree and collect the listeners to send
                    const newViews = this.collectDistinctViewsForSubTree_(subtree);
                    // Ok, we've collected all the listens we need. Set them up.
                    for (let i = 0; i < newViews.length; ++i) {
                        const view = newViews[i], newQuery = view.getQuery();
                        const listener = this.createListenerForView_(view);
                        this.listenProvider_.startListening(SyncTree.queryForListening_(newQuery), this.tagForQuery_(newQuery), listener.hashFn, listener.onComplete);
                    }
                }
            }
            // If we removed anything and we're not covered by a higher up listen, we need to stop listening on this query
            // The above block has us covered in terms of making sure we're set up on listens lower in the tree.
            // Also, note that if we have a cancelError, it's already been removed at the provider level.
            if (!covered && removed.length > 0 && !cancelError) {
                // If we removed a default, then we weren't listening on any of the other queries here. Just cancel the one
                // default. Otherwise, we need to iterate through and cancel each individual query
                if (removingDefault) {
                    // We don't tag default listeners
                    const defaultTag = null;
                    this.listenProvider_.stopListening(SyncTree.queryForListening_(query), defaultTag);
                }
                else {
                    removed.forEach((queryToRemove) => {
                        const tagToRemove = this.queryToTagMap_[SyncTree.makeQueryKey_(queryToRemove)];
                        this.listenProvider_.stopListening(SyncTree.queryForListening_(queryToRemove), tagToRemove);
                    });
                }
            }
            // Now, clear all of the tags we're tracking for the removed listens
            this.removeTags_(removed);
        }
        return cancelEvents;
    }
    /**
     * Returns a complete cache, if we have one, of the data at a particular path. The location must have a listener above
     * it, but as this is only used by transaction code, that should always be the case anyways.
     *
     * Note: this method will *include* hidden writes from transaction with applyLocally set to false.
     * @param {!Path} path The path to the data we want
     * @param {Array.<number>=} writeIdsToExclude A specific set to be excluded
     * @return {?Node}
     */
    calcCompleteEventCache(path, writeIdsToExclude) {
        const includeHiddenSets = true;
        const writeTree = this.pendingWriteTree_;
        const serverCache = this.syncPointTree_.findOnPath(path, function (pathSoFar, syncPoint) {
            const relativePath = Path.relativePath(pathSoFar, path);
            const serverCache = syncPoint.getCompleteServerCache(relativePath);
            if (serverCache) {
                return serverCache;
            }
        });
        return writeTree.calcCompleteEventCache(path, serverCache, writeIdsToExclude, includeHiddenSets);
    }
    /**
     * This collapses multiple unfiltered views into a single view, since we only need a single
     * listener for them.
     *
     * @param {!ImmutableTree.<!SyncPoint>} subtree
     * @return {!Array.<!View>}
     * @private
     */
    collectDistinctViewsForSubTree_(subtree) {
        return subtree.fold((relativePath, maybeChildSyncPoint, childMap) => {
            if (maybeChildSyncPoint && maybeChildSyncPoint.hasCompleteView()) {
                const completeView = maybeChildSyncPoint.getCompleteView();
                return [completeView];
            }
            else {
                // No complete view here, flatten any deeper listens into an array
                let views = [];
                if (maybeChildSyncPoint) {
                    views = maybeChildSyncPoint.getQueryViews();
                }
                forEach(childMap, function (key, childViews) {
                    views = views.concat(childViews);
                });
                return views;
            }
        });
    }
    /**
     * @param {!Array.<!Query>} queries
     * @private
     */
    removeTags_(queries) {
        for (let j = 0; j < queries.length; ++j) {
            const removedQuery = queries[j];
            if (!removedQuery.getQueryParams().loadsAllData()) {
                // We should have a tag for this
                const removedQueryKey = SyncTree.makeQueryKey_(removedQuery);
                const removedQueryTag = this.queryToTagMap_[removedQueryKey];
                delete this.queryToTagMap_[removedQueryKey];
                delete this.tagToQueryMap_['_' + removedQueryTag];
            }
        }
    }
    /**
     * Normalizes a query to a query we send the server for listening
     * @param {!Query} query
     * @return {!Query} The normalized query
     * @private
     */
    static queryForListening_(query) {
        if (query.getQueryParams().loadsAllData() &&
            !query.getQueryParams().isDefault()) {
            // We treat queries that load all data as default queries
            // Cast is necessary because ref() technically returns Firebase which is actually fb.api.Firebase which inherits
            // from Query
            return /** @type {!Query} */ query.getRef();
        }
        else {
            return query;
        }
    }
    /**
     * For a given new listen, manage the de-duplication of outstanding subscriptions.
     *
     * @param {!Query} query
     * @param {!View} view
     * @return {!Array.<!Event>} This method can return events to support synchronous data sources
     * @private
     */
    setupListener_(query, view) {
        const path = query.path;
        const tag = this.tagForQuery_(query);
        const listener = this.createListenerForView_(view);
        const events = this.listenProvider_.startListening(SyncTree.queryForListening_(query), tag, listener.hashFn, listener.onComplete);
        const subtree = this.syncPointTree_.subtree(path);
        // The root of this subtree has our query. We're here because we definitely need to send a listen for that, but we
        // may need to shadow other listens as well.
        if (tag) {
            assert(!subtree.value.hasCompleteView(), "If we're adding a query, it shouldn't be shadowed");
        }
        else {
            // Shadow everything at or below this location, this is a default listener.
            const queriesToStop = subtree.fold(function (relativePath, maybeChildSyncPoint, childMap) {
                if (!relativePath.isEmpty() &&
                    maybeChildSyncPoint &&
                    maybeChildSyncPoint.hasCompleteView()) {
                    return [maybeChildSyncPoint.getCompleteView().getQuery()];
                }
                else {
                    // No default listener here, flatten any deeper queries into an array
                    let queries = [];
                    if (maybeChildSyncPoint) {
                        queries = queries.concat(maybeChildSyncPoint.getQueryViews().map(view => view.getQuery()));
                    }
                    forEach(childMap, function (key, childQueries) {
                        queries = queries.concat(childQueries);
                    });
                    return queries;
                }
            });
            for (let i = 0; i < queriesToStop.length; ++i) {
                const queryToStop = queriesToStop[i];
                this.listenProvider_.stopListening(SyncTree.queryForListening_(queryToStop), this.tagForQuery_(queryToStop));
            }
        }
        return events;
    }
    /**
     *
     * @param {!View} view
     * @return {{hashFn: function(), onComplete: function(!string, *)}}
     * @private
     */
    createListenerForView_(view) {
        const query = view.getQuery();
        const tag = this.tagForQuery_(query);
        return {
            hashFn: () => {
                const cache = view.getServerCache() || ChildrenNode.EMPTY_NODE;
                return cache.hash();
            },
            onComplete: (status) => {
                if (status === 'ok') {
                    if (tag) {
                        return this.applyTaggedListenComplete(query.path, tag);
                    }
                    else {
                        return this.applyListenComplete(query.path);
                    }
                }
                else {
                    // If a listen failed, kill all of the listeners here, not just the one that triggered the error.
                    // Note that this may need to be scoped to just this listener if we change permissions on filtered children
                    const error = errorForServerCode(status, query);
                    return this.removeEventRegistration(query, 
                    /*eventRegistration*/ null, error);
                }
            }
        };
    }
    /**
     * Given a query, computes a "queryKey" suitable for use in our queryToTagMap_.
     * @private
     * @param {!Query} query
     * @return {string}
     */
    static makeQueryKey_(query) {
        return query.path.toString() + '$' + query.queryIdentifier();
    }
    /**
     * Given a queryKey (created by makeQueryKey), parse it back into a path and queryId.
     * @private
     * @param {!string} queryKey
     * @return {{queryId: !string, path: !Path}}
     */
    static parseQueryKey_(queryKey) {
        const splitIndex = queryKey.indexOf('$');
        assert(splitIndex !== -1 && splitIndex < queryKey.length - 1, 'Bad queryKey.');
        return {
            queryId: queryKey.substr(splitIndex + 1),
            path: new Path(queryKey.substr(0, splitIndex))
        };
    }
    /**
     * Return the query associated with the given tag, if we have one
     * @param {!number} tag
     * @return {?string}
     * @private
     */
    queryKeyForTag_(tag) {
        return this.tagToQueryMap_['_' + tag];
    }
    /**
     * Return the tag associated with the given query.
     * @param {!Query} query
     * @return {?number}
     * @private
     */
    tagForQuery_(query) {
        const queryKey = SyncTree.makeQueryKey_(query);
        return safeGet(this.queryToTagMap_, queryKey);
    }
    /**
     * Static accessor for query tags.
     * @return {number}
     * @private
     */
    static getNextQueryTag_() {
        return SyncTree.nextQueryTag_++;
    }
    /**
     * A helper method to apply tagged operations
     *
     * @param {!Path} queryPath
     * @param {!Operation} operation
     * @return {!Array.<!Event>}
     * @private
     */
    applyTaggedOperation_(queryPath, operation) {
        const syncPoint = this.syncPointTree_.get(queryPath);
        assert(syncPoint, "Missing sync point for query tag that we're tracking");
        const writesCache = this.pendingWriteTree_.childWrites(queryPath);
        return syncPoint.applyOperation(operation, writesCache, 
        /*serverCache=*/ null);
    }
    /**
     * A helper method that visits all descendant and ancestor SyncPoints, applying the operation.
     *
     * NOTES:
     * - Descendant SyncPoints will be visited first (since we raise events depth-first).
  
     * - We call applyOperation() on each SyncPoint passing three things:
     *   1. A version of the Operation that has been made relative to the SyncPoint location.
     *   2. A WriteTreeRef of any writes we have cached at the SyncPoint location.
     *   3. A snapshot Node with cached server data, if we have it.
  
     * - We concatenate all of the events returned by each SyncPoint and return the result.
     *
     * @param {!Operation} operation
     * @return {!Array.<!Event>}
     * @private
     */
    applyOperationToSyncPoints_(operation) {
        return this.applyOperationHelper_(operation, this.syncPointTree_, 
        /*serverCache=*/ null, this.pendingWriteTree_.childWrites(Path.Empty));
    }
    /**
     * Recursive helper for applyOperationToSyncPoints_
     *
     * @private
     * @param {!Operation} operation
     * @param {ImmutableTree.<!SyncPoint>} syncPointTree
     * @param {?Node} serverCache
     * @param {!WriteTreeRef} writesCache
     * @return {!Array.<!Event>}
     */
    applyOperationHelper_(operation, syncPointTree, serverCache, writesCache) {
        if (operation.path.isEmpty()) {
            return this.applyOperationDescendantsHelper_(operation, syncPointTree, serverCache, writesCache);
        }
        else {
            const syncPoint = syncPointTree.get(Path.Empty);
            // If we don't have cached server data, see if we can get it from this SyncPoint.
            if (serverCache == null && syncPoint != null) {
                serverCache = syncPoint.getCompleteServerCache(Path.Empty);
            }
            let events = [];
            const childName = operation.path.getFront();
            const childOperation = operation.operationForChild(childName);
            const childTree = syncPointTree.children.get(childName);
            if (childTree && childOperation) {
                const childServerCache = serverCache
                    ? serverCache.getImmediateChild(childName)
                    : null;
                const childWritesCache = writesCache.child(childName);
                events = events.concat(this.applyOperationHelper_(childOperation, childTree, childServerCache, childWritesCache));
            }
            if (syncPoint) {
                events = events.concat(syncPoint.applyOperation(operation, writesCache, serverCache));
            }
            return events;
        }
    }
    /**
     * Recursive helper for applyOperationToSyncPoints_
     *
     * @private
     * @param {!Operation} operation
     * @param {ImmutableTree.<!SyncPoint>} syncPointTree
     * @param {?Node} serverCache
     * @param {!WriteTreeRef} writesCache
     * @return {!Array.<!Event>}
     */
    applyOperationDescendantsHelper_(operation, syncPointTree, serverCache, writesCache) {
        const syncPoint = syncPointTree.get(Path.Empty);
        // If we don't have cached server data, see if we can get it from this SyncPoint.
        if (serverCache == null && syncPoint != null) {
            serverCache = syncPoint.getCompleteServerCache(Path.Empty);
        }
        let events = [];
        syncPointTree.children.inorderTraversal((childName, childTree) => {
            const childServerCache = serverCache
                ? serverCache.getImmediateChild(childName)
                : null;
            const childWritesCache = writesCache.child(childName);
            const childOperation = operation.operationForChild(childName);
            if (childOperation) {
                events = events.concat(this.applyOperationDescendantsHelper_(childOperation, childTree, childServerCache, childWritesCache));
            }
        });
        if (syncPoint) {
            events = events.concat(syncPoint.applyOperation(operation, writesCache, serverCache));
        }
        return events;
    }
}
/**
 * Static tracker for next query tag.
 * @type {number}
 * @private
 */
SyncTree.nextQueryTag_ = 1;

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Mutable object which basically just stores a reference to the "latest" immutable snapshot.
 *
 * @constructor
 */
class SnapshotHolder {
    constructor() {
        this.rootNode_ = ChildrenNode.EMPTY_NODE;
    }
    getNode(path) {
        return this.rootNode_.getChild(path);
    }
    updateSnapshot(path, newSnapshotNode) {
        this.rootNode_ = this.rootNode_.updateChild(path, newSnapshotNode);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Abstraction around FirebaseApp's token fetching capabilities.
 */
class AuthTokenProvider {
    /**
     * @param {!FirebaseApp} app_
     */
    constructor(app_) {
        this.app_ = app_;
    }
    /**
     * @param {boolean} forceRefresh
     * @return {!Promise<FirebaseAuthTokenData>}
     */
    getToken(forceRefresh) {
        return this.app_['INTERNAL']['getToken'](forceRefresh).then(null, 
        // .catch
        function (error) {
            // TODO: Need to figure out all the cases this is raised and whether
            // this makes sense.
            if (error && error.code === 'auth/token-not-initialized') {
                log('Got auth/token-not-initialized error.  Treating as null token.');
                return null;
            }
            else {
                return Promise.reject(error);
            }
        });
    }
    addTokenChangeListener(listener) {
        // TODO: We might want to wrap the listener and call it with no args to
        // avoid a leaky abstraction, but that makes removing the listener harder.
        this.app_['INTERNAL']['addAuthTokenListener'](listener);
    }
    removeTokenChangeListener(listener) {
        this.app_['INTERNAL']['removeAuthTokenListener'](listener);
    }
    notifyForInvalidToken() {
        let errorMessage = 'Provided authentication credentials for the app named "' +
            this.app_.name +
            '" are invalid. This usually indicates your app was not ' +
            'initialized correctly. ';
        if ('credential' in this.app_.options) {
            errorMessage +=
                'Make sure the "credential" property provided to initializeApp() ' +
                    'is authorized to access the specified "databaseURL" and is from the correct ' +
                    'project.';
        }
        else if ('serviceAccount' in this.app_.options) {
            errorMessage +=
                'Make sure the "serviceAccount" property provided to initializeApp() ' +
                    'is authorized to access the specified "databaseURL" and is from the correct ' +
                    'project.';
        }
        else {
            errorMessage +=
                'Make sure the "apiKey" and "databaseURL" properties provided to ' +
                    'initializeApp() match the values provided for your app at ' +
                    'https://console.firebase.google.com/.';
        }
        warn(errorMessage);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Tracks a collection of stats.
 *
 * @constructor
 */
class StatsCollection {
    constructor() {
        this.counters_ = {};
    }
    incrementCounter(name, amount = 1) {
        if (!contains(this.counters_, name))
            this.counters_[name] = 0;
        this.counters_[name] += amount;
    }
    get() {
        return deepCopy(this.counters_);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
class StatsManager {
    static getCollection(repoInfo) {
        const hashString = repoInfo.toString();
        if (!this.collections_[hashString]) {
            this.collections_[hashString] = new StatsCollection();
        }
        return this.collections_[hashString];
    }
    static getOrCreateReporter(repoInfo, creatorFunction) {
        const hashString = repoInfo.toString();
        if (!this.reporters_[hashString]) {
            this.reporters_[hashString] = creatorFunction();
        }
        return this.reporters_[hashString];
    }
}
StatsManager.collections_ = {};
StatsManager.reporters_ = {};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Returns the delta from the previous call to get stats.
 *
 * @param collection_ The collection to "listen" to.
 * @constructor
 */
class StatsListener {
    constructor(collection_) {
        this.collection_ = collection_;
        this.last_ = null;
    }
    get() {
        const newStats = this.collection_.get();
        const delta = clone(newStats);
        if (this.last_) {
            forEach(this.last_, (stat, value) => {
                delta[stat] = delta[stat] - value;
            });
        }
        this.last_ = newStats;
        return delta;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// Assuming some apps may have a short amount of time on page, and a bulk of firebase operations probably
// happen on page load, we try to report our first set of stats pretty quickly, but we wait at least 10
// seconds to try to ensure the Firebase connection is established / settled.
const FIRST_STATS_MIN_TIME = 10 * 1000;
const FIRST_STATS_MAX_TIME = 30 * 1000;
// We'll continue to report stats on average every 5 minutes.
const REPORT_STATS_INTERVAL = 5 * 60 * 1000;
/**
 * @constructor
 */
class StatsReporter {
    /**
     * @param collection
     * @param server_
     */
    constructor(collection, server_) {
        this.server_ = server_;
        this.statsToReport_ = {};
        this.statsListener_ = new StatsListener(collection);
        const timeout = FIRST_STATS_MIN_TIME +
            (FIRST_STATS_MAX_TIME - FIRST_STATS_MIN_TIME) * Math.random();
        setTimeoutNonBlocking(this.reportStats_.bind(this), Math.floor(timeout));
    }
    includeStat(stat) {
        this.statsToReport_[stat] = true;
    }
    reportStats_() {
        const stats = this.statsListener_.get();
        const reportedStats = {};
        let haveStatsToReport = false;
        forEach(stats, (stat, value) => {
            if (value > 0 && contains(this.statsToReport_, stat)) {
                reportedStats[stat] = value;
                haveStatsToReport = true;
            }
        });
        if (haveStatsToReport) {
            this.server_.reportStats(reportedStats);
        }
        // queue our next run.
        setTimeoutNonBlocking(this.reportStats_.bind(this), Math.floor(Math.random() * 2 * REPORT_STATS_INTERVAL));
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * The event queue serves a few purposes:
 * 1. It ensures we maintain event order in the face of event callbacks doing operations that result in more
 *    events being queued.
 * 2. raiseQueuedEvents() handles being called reentrantly nicely.  That is, if in the course of raising events,
 *    raiseQueuedEvents() is called again, the "inner" call will pick up raising events where the "outer" call
 *    left off, ensuring that the events are still raised synchronously and in order.
 * 3. You can use raiseEventsAtPath and raiseEventsForChangedPath to ensure only relevant previously-queued
 *    events are raised synchronously.
 *
 * NOTE: This can all go away if/when we move to async events.
 *
 * @constructor
 */
class EventQueue {
    constructor() {
        /**
         * @private
         * @type {!Array.<EventList>}
         */
        this.eventLists_ = [];
        /**
         * Tracks recursion depth of raiseQueuedEvents_, for debugging purposes.
         * @private
         * @type {!number}
         */
        this.recursionDepth_ = 0;
    }
    /**
     * @param {!Array.<Event>} eventDataList The new events to queue.
     */
    queueEvents(eventDataList) {
        // We group events by path, storing them in a single EventList, to make it easier to skip over them quickly.
        let currList = null;
        for (let i = 0; i < eventDataList.length; i++) {
            const eventData = eventDataList[i];
            const eventPath = eventData.getPath();
            if (currList !== null && !eventPath.equals(currList.getPath())) {
                this.eventLists_.push(currList);
                currList = null;
            }
            if (currList === null) {
                currList = new EventList(eventPath);
            }
            currList.add(eventData);
        }
        if (currList) {
            this.eventLists_.push(currList);
        }
    }
    /**
     * Queues the specified events and synchronously raises all events (including previously queued ones)
     * for the specified path.
     *
     * It is assumed that the new events are all for the specified path.
     *
     * @param {!Path} path The path to raise events for.
     * @param {!Array.<Event>} eventDataList The new events to raise.
     */
    raiseEventsAtPath(path, eventDataList) {
        this.queueEvents(eventDataList);
        this.raiseQueuedEventsMatchingPredicate_((eventPath) => eventPath.equals(path));
    }
    /**
     * Queues the specified events and synchronously raises all events (including previously queued ones) for
     * locations related to the specified change path (i.e. all ancestors and descendants).
     *
     * It is assumed that the new events are all related (ancestor or descendant) to the specified path.
     *
     * @param {!Path} changedPath The path to raise events for.
     * @param {!Array.<!Event>} eventDataList The events to raise
     */
    raiseEventsForChangedPath(changedPath, eventDataList) {
        this.queueEvents(eventDataList);
        this.raiseQueuedEventsMatchingPredicate_((eventPath) => {
            return eventPath.contains(changedPath) || changedPath.contains(eventPath);
        });
    }
    /**
     * @param {!function(!Path):boolean} predicate
     * @private
     */
    raiseQueuedEventsMatchingPredicate_(predicate) {
        this.recursionDepth_++;
        let sentAll = true;
        for (let i = 0; i < this.eventLists_.length; i++) {
            const eventList = this.eventLists_[i];
            if (eventList) {
                const eventPath = eventList.getPath();
                if (predicate(eventPath)) {
                    this.eventLists_[i].raise();
                    this.eventLists_[i] = null;
                }
                else {
                    sentAll = false;
                }
            }
        }
        if (sentAll) {
            this.eventLists_ = [];
        }
        this.recursionDepth_--;
    }
}
/**
 * @param {!Path} path
 * @constructor
 */
class EventList {
    constructor(path_) {
        this.path_ = path_;
        /**
         * @type {!Array.<Event>}
         * @private
         */
        this.events_ = [];
    }
    /**
     * @param {!Event} eventData
     */
    add(eventData) {
        this.events_.push(eventData);
    }
    /**
     * Iterates through the list and raises each event
     */
    raise() {
        for (let i = 0; i < this.events_.length; i++) {
            const eventData = this.events_[i];
            if (eventData !== null) {
                this.events_[i] = null;
                const eventFn = eventData.getEventRunner();
                if (logger) {
                    log('event: ' + eventData.toString());
                }
                exceptionGuard(eventFn);
            }
        }
    }
    /**
     * @return {!Path}
     */
    getPath() {
        return this.path_;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Base class to be used if you want to emit events. Call the constructor with
 * the set of allowed event names.
 */
class EventEmitter {
    /**
     * @param {!Array.<string>} allowedEvents_
     */
    constructor(allowedEvents_) {
        this.allowedEvents_ = allowedEvents_;
        this.listeners_ = {};
        assert(Array.isArray(allowedEvents_) && allowedEvents_.length > 0, 'Requires a non-empty array');
    }
    /**
     * To be called by derived classes to trigger events.
     * @param {!string} eventType
     * @param {...*} var_args
     */
    trigger(eventType, ...var_args) {
        if (Array.isArray(this.listeners_[eventType])) {
            // Clone the list, since callbacks could add/remove listeners.
            const listeners = [...this.listeners_[eventType]];
            for (let i = 0; i < listeners.length; i++) {
                listeners[i].callback.apply(listeners[i].context, var_args);
            }
        }
    }
    on(eventType, callback, context) {
        this.validateEventType_(eventType);
        this.listeners_[eventType] = this.listeners_[eventType] || [];
        this.listeners_[eventType].push({ callback, context });
        const eventData = this.getInitialEvent(eventType);
        if (eventData) {
            callback.apply(context, eventData);
        }
    }
    off(eventType, callback, context) {
        this.validateEventType_(eventType);
        const listeners = this.listeners_[eventType] || [];
        for (let i = 0; i < listeners.length; i++) {
            if (listeners[i].callback === callback &&
                (!context || context === listeners[i].context)) {
                listeners.splice(i, 1);
                return;
            }
        }
    }
    validateEventType_(eventType) {
        assert(this.allowedEvents_.find(function (et) {
            return et === eventType;
        }), 'Unknown event: ' + eventType);
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @extends {EventEmitter}
 */
class VisibilityMonitor extends EventEmitter {
    static getInstance() {
        return new VisibilityMonitor();
    }
    constructor() {
        super(['visible']);
        let hidden;
        let visibilityChange;
        if (typeof document !== 'undefined' &&
            typeof document.addEventListener !== 'undefined') {
            if (typeof document['hidden'] !== 'undefined') {
                // Opera 12.10 and Firefox 18 and later support
                visibilityChange = 'visibilitychange';
                hidden = 'hidden';
            }
            else if (typeof document['mozHidden'] !== 'undefined') {
                visibilityChange = 'mozvisibilitychange';
                hidden = 'mozHidden';
            }
            else if (typeof document['msHidden'] !== 'undefined') {
                visibilityChange = 'msvisibilitychange';
                hidden = 'msHidden';
            }
            else if (typeof document['webkitHidden'] !== 'undefined') {
                visibilityChange = 'webkitvisibilitychange';
                hidden = 'webkitHidden';
            }
        }
        // Initially, we always assume we are visible. This ensures that in browsers
        // without page visibility support or in cases where we are never visible
        // (e.g. chrome extension), we act as if we are visible, i.e. don't delay
        // reconnects
        this.visible_ = true;
        if (visibilityChange) {
            document.addEventListener(visibilityChange, () => {
                const visible = !document[hidden];
                if (visible !== this.visible_) {
                    this.visible_ = visible;
                    this.trigger('visible', visible);
                }
            }, false);
        }
    }
    /**
     * @param {!string} eventType
     * @return {Array.<boolean>}
     */
    getInitialEvent(eventType) {
        assert(eventType === 'visible', 'Unknown event type: ' + eventType);
        return [this.visible_];
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Monitors online state (as reported by window.online/offline events).
 *
 * The expectation is that this could have many false positives (thinks we are online
 * when we're not), but no false negatives.  So we can safely use it to determine when
 * we definitely cannot reach the internet.
 *
 * @extends {EventEmitter}
 */
class OnlineMonitor extends EventEmitter {
    constructor() {
        super(['online']);
        this.online_ = true;
        // We've had repeated complaints that Cordova apps can get stuck "offline", e.g.
        // https://forum.ionicframework.com/t/firebase-connection-is-lost-and-never-come-back/43810
        // It would seem that the 'online' event does not always fire consistently. So we disable it
        // for Cordova.
        if (typeof window !== 'undefined' &&
            typeof window.addEventListener !== 'undefined' &&
            !isMobileCordova()) {
            window.addEventListener('online', () => {
                if (!this.online_) {
                    this.online_ = true;
                    this.trigger('online', true);
                }
            }, false);
            window.addEventListener('offline', () => {
                if (this.online_) {
                    this.online_ = false;
                    this.trigger('online', false);
                }
            }, false);
        }
    }
    static getInstance() {
        return new OnlineMonitor();
    }
    /**
     * @param {!string} eventType
     * @return {Array.<boolean>}
     */
    getInitialEvent(eventType) {
        assert(eventType === 'online', 'Unknown event type: ' + eventType);
        return [this.online_];
    }
    /**
     * @return {boolean}
     */
    currentlyOnline() {
        return this.online_;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * This class ensures the packets from the server arrive in order
 * This class takes data from the server and ensures it gets passed into the callbacks in order.
 * @constructor
 */
class PacketReceiver {
    /**
     * @param onMessage_
     */
    constructor(onMessage_) {
        this.onMessage_ = onMessage_;
        this.pendingResponses = [];
        this.currentResponseNum = 0;
        this.closeAfterResponse = -1;
        this.onClose = null;
    }
    closeAfter(responseNum, callback) {
        this.closeAfterResponse = responseNum;
        this.onClose = callback;
        if (this.closeAfterResponse < this.currentResponseNum) {
            this.onClose();
            this.onClose = null;
        }
    }
    /**
     * Each message from the server comes with a response number, and an array of data. The responseNumber
     * allows us to ensure that we process them in the right order, since we can't be guaranteed that all
     * browsers will respond in the same order as the requests we sent
     * @param {number} requestNum
     * @param {Array} data
     */
    handleResponse(requestNum, data) {
        this.pendingResponses[requestNum] = data;
        while (this.pendingResponses[this.currentResponseNum]) {
            const toProcess = this.pendingResponses[this.currentResponseNum];
            delete this.pendingResponses[this.currentResponseNum];
            for (let i = 0; i < toProcess.length; ++i) {
                if (toProcess[i]) {
                    exceptionGuard(() => {
                        this.onMessage_(toProcess[i]);
                    });
                }
            }
            if (this.currentResponseNum === this.closeAfterResponse) {
                if (this.onClose) {
                    this.onClose();
                    this.onClose = null;
                }
                break;
            }
            this.currentResponseNum++;
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// URL query parameters associated with longpolling
const FIREBASE_LONGPOLL_START_PARAM = 'start';
const FIREBASE_LONGPOLL_CLOSE_COMMAND = 'close';
const FIREBASE_LONGPOLL_COMMAND_CB_NAME = 'pLPCommand';
const FIREBASE_LONGPOLL_DATA_CB_NAME = 'pRTLPCB';
const FIREBASE_LONGPOLL_ID_PARAM = 'id';
const FIREBASE_LONGPOLL_PW_PARAM = 'pw';
const FIREBASE_LONGPOLL_SERIAL_PARAM = 'ser';
const FIREBASE_LONGPOLL_CALLBACK_ID_PARAM = 'cb';
const FIREBASE_LONGPOLL_SEGMENT_NUM_PARAM = 'seg';
const FIREBASE_LONGPOLL_SEGMENTS_IN_PACKET = 'ts';
const FIREBASE_LONGPOLL_DATA_PARAM = 'd';
const FIREBASE_LONGPOLL_DISCONN_FRAME_PARAM = 'disconn';
const FIREBASE_LONGPOLL_DISCONN_FRAME_REQUEST_PARAM = 'dframe';
//Data size constants.
//TODO: Perf: the maximum length actually differs from browser to browser.
// We should check what browser we're on and set accordingly.
const MAX_URL_DATA_SIZE = 1870;
const SEG_HEADER_SIZE = 30; //ie: &seg=8299234&ts=982389123&d=
const MAX_PAYLOAD_SIZE = MAX_URL_DATA_SIZE - SEG_HEADER_SIZE;
/**
 * Keepalive period
 * send a fresh request at minimum every 25 seconds. Opera has a maximum request
 * length of 30 seconds that we can't exceed.
 * @const
 * @type {number}
 */
const KEEPALIVE_REQUEST_INTERVAL = 25000;
/**
 * How long to wait before aborting a long-polling connection attempt.
 * @const
 * @type {number}
 */
const LP_CONNECT_TIMEOUT = 30000;
/**
 * This class manages a single long-polling connection.
 *
 * @constructor
 * @implements {Transport}
 */
class BrowserPollConnection {
    /**
     * @param {string} connId An identifier for this connection, used for logging
     * @param {RepoInfo} repoInfo The info for the endpoint to send data to.
     * @param {string=} transportSessionId Optional transportSessionid if we are reconnecting for an existing
     *                                         transport session
     * @param {string=}  lastSessionId Optional lastSessionId if the PersistentConnection has already created a
     *                                     connection previously
     */
    constructor(connId, repoInfo, transportSessionId, lastSessionId) {
        this.connId = connId;
        this.repoInfo = repoInfo;
        this.transportSessionId = transportSessionId;
        this.lastSessionId = lastSessionId;
        this.bytesSent = 0;
        this.bytesReceived = 0;
        this.everConnected_ = false;
        this.log_ = logWrapper(connId);
        this.stats_ = StatsManager.getCollection(repoInfo);
        this.urlFn = (params) => repoInfo.connectionURL(LONG_POLLING, params);
    }
    /**
     *
     * @param {function(Object)} onMessage Callback when messages arrive
     * @param {function()} onDisconnect Callback with connection lost.
     */
    open(onMessage, onDisconnect) {
        this.curSegmentNum = 0;
        this.onDisconnect_ = onDisconnect;
        this.myPacketOrderer = new PacketReceiver(onMessage);
        this.isClosed_ = false;
        this.connectTimeoutTimer_ = setTimeout(() => {
            this.log_('Timed out trying to connect.');
            // Make sure we clear the host cache
            this.onClosed_();
            this.connectTimeoutTimer_ = null;
        }, Math.floor(LP_CONNECT_TIMEOUT));
        // Ensure we delay the creation of the iframe until the DOM is loaded.
        executeWhenDOMReady(() => {
            if (this.isClosed_)
                return;
            //Set up a callback that gets triggered once a connection is set up.
            this.scriptTagHolder = new FirebaseIFrameScriptHolder((...args) => {
                const [command, arg1, arg2, arg3, arg4] = args;
                this.incrementIncomingBytes_(args);
                if (!this.scriptTagHolder)
                    return; // we closed the connection.
                if (this.connectTimeoutTimer_) {
                    clearTimeout(this.connectTimeoutTimer_);
                    this.connectTimeoutTimer_ = null;
                }
                this.everConnected_ = true;
                if (command == FIREBASE_LONGPOLL_START_PARAM) {
                    this.id = arg1;
                    this.password = arg2;
                }
                else if (command === FIREBASE_LONGPOLL_CLOSE_COMMAND) {
                    // Don't clear the host cache. We got a response from the server, so we know it's reachable
                    if (arg1) {
                        // We aren't expecting any more data (other than what the server's already in the process of sending us
                        // through our already open polls), so don't send any more.
                        this.scriptTagHolder.sendNewPolls = false;
                        // arg1 in this case is the last response number sent by the server. We should try to receive
                        // all of the responses up to this one before closing
                        this.myPacketOrderer.closeAfter(arg1, () => {
                            this.onClosed_();
                        });
                    }
                    else {
                        this.onClosed_();
                    }
                }
                else {
                    throw new Error('Unrecognized command received: ' + command);
                }
            }, (...args) => {
                const [pN, data] = args;
                this.incrementIncomingBytes_(args);
                this.myPacketOrderer.handleResponse(pN, data);
            }, () => {
                this.onClosed_();
            }, this.urlFn);
            //Send the initial request to connect. The serial number is simply to keep the browser from pulling previous results
            //from cache.
            const urlParams = {};
            urlParams[FIREBASE_LONGPOLL_START_PARAM] = 't';
            urlParams[FIREBASE_LONGPOLL_SERIAL_PARAM] = Math.floor(Math.random() * 100000000);
            if (this.scriptTagHolder.uniqueCallbackIdentifier)
                urlParams[FIREBASE_LONGPOLL_CALLBACK_ID_PARAM] = this.scriptTagHolder.uniqueCallbackIdentifier;
            urlParams[VERSION_PARAM] = PROTOCOL_VERSION;
            if (this.transportSessionId) {
                urlParams[TRANSPORT_SESSION_PARAM] = this.transportSessionId;
            }
            if (this.lastSessionId) {
                urlParams[LAST_SESSION_PARAM] = this.lastSessionId;
            }
            if (!isNodeSdk() &&
                typeof location !== 'undefined' &&
                location.href &&
                location.href.indexOf(FORGE_DOMAIN) !== -1) {
                urlParams[REFERER_PARAM] = FORGE_REF;
            }
            const connectURL = this.urlFn(urlParams);
            this.log_('Connecting via long-poll to ' + connectURL);
            this.scriptTagHolder.addTag(connectURL, () => {
                /* do nothing */
            });
        });
    }
    /**
     * Call this when a handshake has completed successfully and we want to consider the connection established
     */
    start() {
        this.scriptTagHolder.startLongPoll(this.id, this.password);
        this.addDisconnectPingFrame(this.id, this.password);
    }
    /**
     * Forces long polling to be considered as a potential transport
     */
    static forceAllow() {
        BrowserPollConnection.forceAllow_ = true;
    }
    /**
     * Forces longpolling to not be considered as a potential transport
     */
    static forceDisallow() {
        BrowserPollConnection.forceDisallow_ = true;
    }
    // Static method, use string literal so it can be accessed in a generic way
    static isAvailable() {
        // NOTE: In React-Native there's normally no 'document', but if you debug a React-Native app in
        // the Chrome debugger, 'document' is defined, but document.createElement is null (2015/06/08).
        return (BrowserPollConnection.forceAllow_ ||
            (!BrowserPollConnection.forceDisallow_ &&
                typeof document !== 'undefined' &&
                document.createElement != null &&
                !isChromeExtensionContentScript() &&
                !isWindowsStoreApp() &&
                !isNodeSdk()));
    }
    /**
     * No-op for polling
     */
    markConnectionHealthy() { }
    /**
     * Stops polling and cleans up the iframe
     * @private
     */
    shutdown_() {
        this.isClosed_ = true;
        if (this.scriptTagHolder) {
            this.scriptTagHolder.close();
            this.scriptTagHolder = null;
        }
        //remove the disconnect frame, which will trigger an XHR call to the server to tell it we're leaving.
        if (this.myDisconnFrame) {
            document.body.removeChild(this.myDisconnFrame);
            this.myDisconnFrame = null;
        }
        if (this.connectTimeoutTimer_) {
            clearTimeout(this.connectTimeoutTimer_);
            this.connectTimeoutTimer_ = null;
        }
    }
    /**
     * Triggered when this transport is closed
     * @private
     */
    onClosed_() {
        if (!this.isClosed_) {
            this.log_('Longpoll is closing itself');
            this.shutdown_();
            if (this.onDisconnect_) {
                this.onDisconnect_(this.everConnected_);
                this.onDisconnect_ = null;
            }
        }
    }
    /**
     * External-facing close handler. RealTime has requested we shut down. Kill our connection and tell the server
     * that we've left.
     */
    close() {
        if (!this.isClosed_) {
            this.log_('Longpoll is being closed.');
            this.shutdown_();
        }
    }
    /**
     * Send the JSON object down to the server. It will need to be stringified, base64 encoded, and then
     * broken into chunks (since URLs have a small maximum length).
     * @param {!Object} data The JSON data to transmit.
     */
    send(data) {
        const dataStr = stringify(data);
        this.bytesSent += dataStr.length;
        this.stats_.incrementCounter('bytes_sent', dataStr.length);
        //first, lets get the base64-encoded data
        const base64data = base64Encode(dataStr);
        //We can only fit a certain amount in each URL, so we need to split this request
        //up into multiple pieces if it doesn't fit in one request.
        const dataSegs = splitStringBySize(base64data, MAX_PAYLOAD_SIZE);
        //Enqueue each segment for transmission. We assign each chunk a sequential ID and a total number
        //of segments so that we can reassemble the packet on the server.
        for (let i = 0; i < dataSegs.length; i++) {
            this.scriptTagHolder.enqueueSegment(this.curSegmentNum, dataSegs.length, dataSegs[i]);
            this.curSegmentNum++;
        }
    }
    /**
     * This is how we notify the server that we're leaving.
     * We aren't able to send requests with DHTML on a window close event, but we can
     * trigger XHR requests in some browsers (everything but Opera basically).
     * @param {!string} id
     * @param {!string} pw
     */
    addDisconnectPingFrame(id, pw) {
        if (isNodeSdk())
            return;
        this.myDisconnFrame = document.createElement('iframe');
        const urlParams = {};
        urlParams[FIREBASE_LONGPOLL_DISCONN_FRAME_REQUEST_PARAM] = 't';
        urlParams[FIREBASE_LONGPOLL_ID_PARAM] = id;
        urlParams[FIREBASE_LONGPOLL_PW_PARAM] = pw;
        this.myDisconnFrame.src = this.urlFn(urlParams);
        this.myDisconnFrame.style.display = 'none';
        document.body.appendChild(this.myDisconnFrame);
    }
    /**
     * Used to track the bytes received by this client
     * @param {*} args
     * @private
     */
    incrementIncomingBytes_(args) {
        // TODO: This is an annoying perf hit just to track the number of incoming bytes.  Maybe it should be opt-in.
        const bytesReceived = stringify(args).length;
        this.bytesReceived += bytesReceived;
        this.stats_.incrementCounter('bytes_received', bytesReceived);
    }
}
/*********************************************************************************************
 * A wrapper around an iframe that is used as a long-polling script holder.
 * @constructor
 *********************************************************************************************/
class FirebaseIFrameScriptHolder {
    /**
     * @param commandCB - The callback to be called when control commands are recevied from the server.
     * @param onMessageCB - The callback to be triggered when responses arrive from the server.
     * @param onDisconnect - The callback to be triggered when this tag holder is closed
     * @param urlFn - A function that provides the URL of the endpoint to send data to.
     */
    constructor(commandCB, onMessageCB, onDisconnect, urlFn) {
        this.onDisconnect = onDisconnect;
        this.urlFn = urlFn;
        //We maintain a count of all of the outstanding requests, because if we have too many active at once it can cause
        //problems in some browsers.
        /**
         * @type {CountedSet.<number, number>}
         */
        this.outstandingRequests = new CountedSet();
        //A queue of the pending segments waiting for transmission to the server.
        this.pendingSegs = [];
        //A serial number. We use this for two things:
        // 1) A way to ensure the browser doesn't cache responses to polls
        // 2) A way to make the server aware when long-polls arrive in a different order than we started them. The
        //    server needs to release both polls in this case or it will cause problems in Opera since Opera can only execute
        //    JSONP code in the order it was added to the iframe.
        this.currentSerial = Math.floor(Math.random() * 100000000);
        // This gets set to false when we're "closing down" the connection (e.g. we're switching transports but there's still
        // incoming data from the server that we're waiting for).
        this.sendNewPolls = true;
        if (!isNodeSdk()) {
            //Each script holder registers a couple of uniquely named callbacks with the window. These are called from the
            //iframes where we put the long-polling script tags. We have two callbacks:
            //   1) Command Callback - Triggered for control issues, like starting a connection.
            //   2) Message Callback - Triggered when new data arrives.
            this.uniqueCallbackIdentifier = LUIDGenerator();
            window[FIREBASE_LONGPOLL_COMMAND_CB_NAME + this.uniqueCallbackIdentifier] = commandCB;
            window[FIREBASE_LONGPOLL_DATA_CB_NAME + this.uniqueCallbackIdentifier] = onMessageCB;
            //Create an iframe for us to add script tags to.
            this.myIFrame = FirebaseIFrameScriptHolder.createIFrame_();
            // Set the iframe's contents.
            let script = '';
            // if we set a javascript url, it's IE and we need to set the document domain. The javascript url is sufficient
            // for ie9, but ie8 needs to do it again in the document itself.
            if (this.myIFrame.src &&
                this.myIFrame.src.substr(0, 'javascript:'.length) === 'javascript:') {
                const currentDomain = document.domain;
                script = '<script>document.domain="' + currentDomain + '";</script>';
            }
            const iframeContents = '<html><body>' + script + '</body></html>';
            try {
                this.myIFrame.doc.open();
                this.myIFrame.doc.write(iframeContents);
                this.myIFrame.doc.close();
            }
            catch (e) {
                log('frame writing exception');
                if (e.stack) {
                    log(e.stack);
                }
                log(e);
            }
        }
        else {
            this.commandCB = commandCB;
            this.onMessageCB = onMessageCB;
        }
    }
    /**
     * Each browser has its own funny way to handle iframes. Here we mush them all together into one object that I can
     * actually use.
     * @private
     * @return {Element}
     */
    static createIFrame_() {
        const iframe = document.createElement('iframe');
        iframe.style.display = 'none';
        // This is necessary in order to initialize the document inside the iframe
        if (document.body) {
            document.body.appendChild(iframe);
            try {
                // If document.domain has been modified in IE, this will throw an error, and we need to set the
                // domain of the iframe's document manually. We can do this via a javascript: url as the src attribute
                // Also note that we must do this *after* the iframe has been appended to the page. Otherwise it doesn't work.
                const a = iframe.contentWindow.document;
                if (!a) {
                    // Apologies for the log-spam, I need to do something to keep closure from optimizing out the assignment above.
                    log('No IE domain setting required');
                }
            }
            catch (e) {
                const domain = document.domain;
                iframe.src =
                    "javascript:void((function(){document.open();document.domain='" +
                        domain +
                        "';document.close();})())";
            }
        }
        else {
            // LongPollConnection attempts to delay initialization until the document is ready, so hopefully this
            // never gets hit.
            throw 'Document body has not initialized. Wait to initialize Firebase until after the document is ready.';
        }
        // Get the document of the iframe in a browser-specific way.
        if (iframe.contentDocument) {
            iframe.doc = iframe.contentDocument; // Firefox, Opera, Safari
        }
        else if (iframe.contentWindow) {
            iframe.doc = iframe.contentWindow.document; // Internet Explorer
        }
        else if (iframe.document) {
            iframe.doc = iframe.document; //others?
        }
        return iframe;
    }
    /**
     * Cancel all outstanding queries and remove the frame.
     */
    close() {
        //Mark this iframe as dead, so no new requests are sent.
        this.alive = false;
        if (this.myIFrame) {
            //We have to actually remove all of the html inside this iframe before removing it from the
            //window, or IE will continue loading and executing the script tags we've already added, which
            //can lead to some errors being thrown. Setting innerHTML seems to be the easiest way to do this.
            this.myIFrame.doc.body.innerHTML = '';
            setTimeout(() => {
                if (this.myIFrame !== null) {
                    document.body.removeChild(this.myIFrame);
                    this.myIFrame = null;
                }
            }, Math.floor(0));
        }
        if (isNodeSdk() && this.myID) {
            const urlParams = {};
            urlParams[FIREBASE_LONGPOLL_DISCONN_FRAME_PARAM] = 't';
            urlParams[FIREBASE_LONGPOLL_ID_PARAM] = this.myID;
            urlParams[FIREBASE_LONGPOLL_PW_PARAM] = this.myPW;
            const theURL = this.urlFn(urlParams);
            FirebaseIFrameScriptHolder.nodeRestRequest(theURL);
        }
        // Protect from being called recursively.
        const onDisconnect = this.onDisconnect;
        if (onDisconnect) {
            this.onDisconnect = null;
            onDisconnect();
        }
    }
    /**
     * Actually start the long-polling session by adding the first script tag(s) to the iframe.
     * @param {!string} id - The ID of this connection
     * @param {!string} pw - The password for this connection
     */
    startLongPoll(id, pw) {
        this.myID = id;
        this.myPW = pw;
        this.alive = true;
        //send the initial request. If there are requests queued, make sure that we transmit as many as we are currently able to.
        while (this.newRequest_()) { }
    }
    /**
     * This is called any time someone might want a script tag to be added. It adds a script tag when there aren't
     * too many outstanding requests and we are still alive.
     *
     * If there are outstanding packet segments to send, it sends one. If there aren't, it sends a long-poll anyways if
     * needed.
     */
    newRequest_() {
        // We keep one outstanding request open all the time to receive data, but if we need to send data
        // (pendingSegs.length > 0) then we create a new request to send the data.  The server will automatically
        // close the old request.
        if (this.alive &&
            this.sendNewPolls &&
            this.outstandingRequests.count() < (this.pendingSegs.length > 0 ? 2 : 1)) {
            //construct our url
            this.currentSerial++;
            const urlParams = {};
            urlParams[FIREBASE_LONGPOLL_ID_PARAM] = this.myID;
            urlParams[FIREBASE_LONGPOLL_PW_PARAM] = this.myPW;
            urlParams[FIREBASE_LONGPOLL_SERIAL_PARAM] = this.currentSerial;
            let theURL = this.urlFn(urlParams);
            //Now add as much data as we can.
            let curDataString = '';
            let i = 0;
            while (this.pendingSegs.length > 0) {
                //first, lets see if the next segment will fit.
                const nextSeg = this.pendingSegs[0];
                if (nextSeg.d.length + SEG_HEADER_SIZE + curDataString.length <=
                    MAX_URL_DATA_SIZE) {
                    //great, the segment will fit. Lets append it.
                    const theSeg = this.pendingSegs.shift();
                    curDataString =
                        curDataString +
                            '&' +
                            FIREBASE_LONGPOLL_SEGMENT_NUM_PARAM +
                            i +
                            '=' +
                            theSeg.seg +
                            '&' +
                            FIREBASE_LONGPOLL_SEGMENTS_IN_PACKET +
                            i +
                            '=' +
                            theSeg.ts +
                            '&' +
                            FIREBASE_LONGPOLL_DATA_PARAM +
                            i +
                            '=' +
                            theSeg.d;
                    i++;
                }
                else {
                    break;
                }
            }
            theURL = theURL + curDataString;
            this.addLongPollTag_(theURL, this.currentSerial);
            return true;
        }
        else {
            return false;
        }
    }
    /**
     * Queue a packet for transmission to the server.
     * @param segnum - A sequential id for this packet segment used for reassembly
     * @param totalsegs - The total number of segments in this packet
     * @param data - The data for this segment.
     */
    enqueueSegment(segnum, totalsegs, data) {
        //add this to the queue of segments to send.
        this.pendingSegs.push({ seg: segnum, ts: totalsegs, d: data });
        //send the data immediately if there isn't already data being transmitted, unless
        //startLongPoll hasn't been called yet.
        if (this.alive) {
            this.newRequest_();
        }
    }
    /**
     * Add a script tag for a regular long-poll request.
     * @param {!string} url - The URL of the script tag.
     * @param {!number} serial - The serial number of the request.
     * @private
     */
    addLongPollTag_(url, serial) {
        //remember that we sent this request.
        this.outstandingRequests.add(serial, 1);
        const doNewRequest = () => {
            this.outstandingRequests.remove(serial);
            this.newRequest_();
        };
        // If this request doesn't return on its own accord (by the server sending us some data), we'll
        // create a new one after the KEEPALIVE interval to make sure we always keep a fresh request open.
        const keepaliveTimeout = setTimeout(doNewRequest, Math.floor(KEEPALIVE_REQUEST_INTERVAL));
        const readyStateCB = () => {
            // Request completed.  Cancel the keepalive.
            clearTimeout(keepaliveTimeout);
            // Trigger a new request so we can continue receiving data.
            doNewRequest();
        };
        this.addTag(url, readyStateCB);
    }
    /**
     * Add an arbitrary script tag to the iframe.
     * @param {!string} url - The URL for the script tag source.
     * @param {!function()} loadCB - A callback to be triggered once the script has loaded.
     */
    addTag(url, loadCB) {
        if (isNodeSdk()) {
            this.doNodeLongPoll(url, loadCB);
        }
        else {
            setTimeout(() => {
                try {
                    // if we're already closed, don't add this poll
                    if (!this.sendNewPolls)
                        return;
                    const newScript = this.myIFrame.doc.createElement('script');
                    newScript.type = 'text/javascript';
                    newScript.async = true;
                    newScript.src = url;
                    newScript.onload = newScript.onreadystatechange = function () {
                        const rstate = newScript.readyState;
                        if (!rstate || rstate === 'loaded' || rstate === 'complete') {
                            newScript.onload = newScript.onreadystatechange = null;
                            if (newScript.parentNode) {
                                newScript.parentNode.removeChild(newScript);
                            }
                            loadCB();
                        }
                    };
                    newScript.onerror = () => {
                        log('Long-poll script failed to load: ' + url);
                        this.sendNewPolls = false;
                        this.close();
                    };
                    this.myIFrame.doc.body.appendChild(newScript);
                }
                catch (e) {
                    // TODO: we should make this error visible somehow
                }
            }, Math.floor(1));
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const WEBSOCKET_MAX_FRAME_SIZE = 16384;
const WEBSOCKET_KEEPALIVE_INTERVAL = 45000;
let WebSocketImpl = null;
if (typeof MozWebSocket !== 'undefined') {
    WebSocketImpl = MozWebSocket;
}
else if (typeof WebSocket !== 'undefined') {
    WebSocketImpl = WebSocket;
}
/**
 * Create a new websocket connection with the given callbacks.
 * @constructor
 * @implements {Transport}
 */
class WebSocketConnection {
    /**
     * @param {string} connId identifier for this transport
     * @param {RepoInfo} repoInfo The info for the websocket endpoint.
     * @param {string=} transportSessionId Optional transportSessionId if this is connecting to an existing transport
     *                                         session
     * @param {string=} lastSessionId Optional lastSessionId if there was a previous connection
     */
    constructor(connId, repoInfo, transportSessionId, lastSessionId) {
        this.connId = connId;
        this.keepaliveTimer = null;
        this.frames = null;
        this.totalFrames = 0;
        this.bytesSent = 0;
        this.bytesReceived = 0;
        this.log_ = logWrapper(this.connId);
        this.stats_ = StatsManager.getCollection(repoInfo);
        this.connURL = WebSocketConnection.connectionURL_(repoInfo, transportSessionId, lastSessionId);
    }
    /**
     * @param {RepoInfo} repoInfo The info for the websocket endpoint.
     * @param {string=} transportSessionId Optional transportSessionId if this is connecting to an existing transport
     *                                         session
     * @param {string=} lastSessionId Optional lastSessionId if there was a previous connection
     * @return {string} connection url
     * @private
     */
    static connectionURL_(repoInfo, transportSessionId, lastSessionId) {
        const urlParams = {};
        urlParams[VERSION_PARAM] = PROTOCOL_VERSION;
        if (!isNodeSdk() &&
            typeof location !== 'undefined' &&
            location.href &&
            location.href.indexOf(FORGE_DOMAIN) !== -1) {
            urlParams[REFERER_PARAM] = FORGE_REF;
        }
        if (transportSessionId) {
            urlParams[TRANSPORT_SESSION_PARAM] = transportSessionId;
        }
        if (lastSessionId) {
            urlParams[LAST_SESSION_PARAM] = lastSessionId;
        }
        return repoInfo.connectionURL(WEBSOCKET, urlParams);
    }
    /**
     *
     * @param onMessage Callback when messages arrive
     * @param onDisconnect Callback with connection lost.
     */
    open(onMessage, onDisconnect) {
        this.onDisconnect = onDisconnect;
        this.onMessage = onMessage;
        this.log_('Websocket connecting to ' + this.connURL);
        this.everConnected_ = false;
        // Assume failure until proven otherwise.
        PersistentStorage.set('previous_websocket_failure', true);
        try {
            if (isNodeSdk()) {
                const device = CONSTANTS.NODE_ADMIN ? 'AdminNode' : 'Node';
                // UA Format: Firebase/<wire_protocol>/<sdk_version>/<platform>/<device>
                const options = {
                    headers: {
                        'User-Agent': `Firebase/${PROTOCOL_VERSION}/${firebase.SDK_VERSION}/${process.platform}/${device}`
                    }
                };
                // Plumb appropriate http_proxy environment variable into faye-websocket if it exists.
                const env = process['env'];
                const proxy = this.connURL.indexOf('wss://') == 0
                    ? env['HTTPS_PROXY'] || env['https_proxy']
                    : env['HTTP_PROXY'] || env['http_proxy'];
                if (proxy) {
                    options['proxy'] = { origin: proxy };
                }
                this.mySock = new WebSocketImpl(this.connURL, [], options);
            }
            else {
                this.mySock = new WebSocketImpl(this.connURL);
            }
        }
        catch (e) {
            this.log_('Error instantiating WebSocket.');
            const error = e.message || e.data;
            if (error) {
                this.log_(error);
            }
            this.onClosed_();
            return;
        }
        this.mySock.onopen = () => {
            this.log_('Websocket connected.');
            this.everConnected_ = true;
        };
        this.mySock.onclose = () => {
            this.log_('Websocket connection was disconnected.');
            this.mySock = null;
            this.onClosed_();
        };
        this.mySock.onmessage = (m) => {
            this.handleIncomingFrame(m);
        };
        this.mySock.onerror = (e) => {
            this.log_('WebSocket error.  Closing connection.');
            const error = e.message || e.data;
            if (error) {
                this.log_(error);
            }
            this.onClosed_();
        };
    }
    /**
     * No-op for websockets, we don't need to do anything once the connection is confirmed as open
     */
    start() { }
    static forceDisallow() {
        WebSocketConnection.forceDisallow_ = true;
    }
    static isAvailable() {
        let isOldAndroid = false;
        if (typeof navigator !== 'undefined' && navigator.userAgent) {
            const oldAndroidRegex = /Android ([0-9]{0,}\.[0-9]{0,})/;
            const oldAndroidMatch = navigator.userAgent.match(oldAndroidRegex);
            if (oldAndroidMatch && oldAndroidMatch.length > 1) {
                if (parseFloat(oldAndroidMatch[1]) < 4.4) {
                    isOldAndroid = true;
                }
            }
        }
        return (!isOldAndroid &&
            WebSocketImpl !== null &&
            !WebSocketConnection.forceDisallow_);
    }
    /**
     * Returns true if we previously failed to connect with this transport.
     * @return {boolean}
     */
    static previouslyFailed() {
        // If our persistent storage is actually only in-memory storage,
        // we default to assuming that it previously failed to be safe.
        return (PersistentStorage.isInMemoryStorage ||
            PersistentStorage.get('previous_websocket_failure') === true);
    }
    markConnectionHealthy() {
        PersistentStorage.remove('previous_websocket_failure');
    }
    appendFrame_(data) {
        this.frames.push(data);
        if (this.frames.length == this.totalFrames) {
            const fullMess = this.frames.join('');
            this.frames = null;
            const jsonMess = jsonEval(fullMess);
            //handle the message
            this.onMessage(jsonMess);
        }
    }
    /**
     * @param {number} frameCount The number of frames we are expecting from the server
     * @private
     */
    handleNewFrameCount_(frameCount) {
        this.totalFrames = frameCount;
        this.frames = [];
    }
    /**
     * Attempts to parse a frame count out of some text. If it can't, assumes a value of 1
     * @param {!String} data
     * @return {?String} Any remaining data to be process, or null if there is none
     * @private
     */
    extractFrameCount_(data) {
        assert(this.frames === null, 'We already have a frame buffer');
        // TODO: The server is only supposed to send up to 9999 frames (i.e. length <= 4), but that isn't being enforced
        // currently.  So allowing larger frame counts (length <= 6).  See https://app.asana.com/0/search/8688598998380/8237608042508
        if (data.length <= 6) {
            const frameCount = Number(data);
            if (!isNaN(frameCount)) {
                this.handleNewFrameCount_(frameCount);
                return null;
            }
        }
        this.handleNewFrameCount_(1);
        return data;
    }
    /**
     * Process a websocket frame that has arrived from the server.
     * @param mess The frame data
     */
    handleIncomingFrame(mess) {
        if (this.mySock === null)
            return; // Chrome apparently delivers incoming packets even after we .close() the connection sometimes.
        const data = mess['data'];
        this.bytesReceived += data.length;
        this.stats_.incrementCounter('bytes_received', data.length);
        this.resetKeepAlive();
        if (this.frames !== null) {
            // we're buffering
            this.appendFrame_(data);
        }
        else {
            // try to parse out a frame count, otherwise, assume 1 and process it
            const remainingData = this.extractFrameCount_(data);
            if (remainingData !== null) {
                this.appendFrame_(remainingData);
            }
        }
    }
    /**
     * Send a message to the server
     * @param {Object} data The JSON object to transmit
     */
    send(data) {
        this.resetKeepAlive();
        const dataStr = stringify(data);
        this.bytesSent += dataStr.length;
        this.stats_.incrementCounter('bytes_sent', dataStr.length);
        //We can only fit a certain amount in each websocket frame, so we need to split this request
        //up into multiple pieces if it doesn't fit in one request.
        const dataSegs = splitStringBySize(dataStr, WEBSOCKET_MAX_FRAME_SIZE);
        //Send the length header
        if (dataSegs.length > 1) {
            this.sendString_(String(dataSegs.length));
        }
        //Send the actual data in segments.
        for (let i = 0; i < dataSegs.length; i++) {
            this.sendString_(dataSegs[i]);
        }
    }
    shutdown_() {
        this.isClosed_ = true;
        if (this.keepaliveTimer) {
            clearInterval(this.keepaliveTimer);
            this.keepaliveTimer = null;
        }
        if (this.mySock) {
            this.mySock.close();
            this.mySock = null;
        }
    }
    onClosed_() {
        if (!this.isClosed_) {
            this.log_('WebSocket is closing itself');
            this.shutdown_();
            // since this is an internal close, trigger the close listener
            if (this.onDisconnect) {
                this.onDisconnect(this.everConnected_);
                this.onDisconnect = null;
            }
        }
    }
    /**
     * External-facing close handler.
     * Close the websocket and kill the connection.
     */
    close() {
        if (!this.isClosed_) {
            this.log_('WebSocket is being closed');
            this.shutdown_();
        }
    }
    /**
     * Kill the current keepalive timer and start a new one, to ensure that it always fires N seconds after
     * the last activity.
     */
    resetKeepAlive() {
        clearInterval(this.keepaliveTimer);
        this.keepaliveTimer = setInterval(() => {
            //If there has been no websocket activity for a while, send a no-op
            if (this.mySock) {
                this.sendString_('0');
            }
            this.resetKeepAlive();
        }, Math.floor(WEBSOCKET_KEEPALIVE_INTERVAL));
    }
    /**
     * Send a string over the websocket.
     *
     * @param {string} str String to send.
     * @private
     */
    sendString_(str) {
        // Firefox seems to sometimes throw exceptions (NS_ERROR_UNEXPECTED) from websocket .send()
        // calls for some unknown reason.  We treat these as an error and disconnect.
        // See https://app.asana.com/0/58926111402292/68021340250410
        try {
            this.mySock.send(str);
        }
        catch (e) {
            this.log_('Exception thrown from WebSocket.send():', e.message || e.data, 'Closing connection.');
            setTimeout(this.onClosed_.bind(this), 0);
        }
    }
}
/**
 * Number of response before we consider the connection "healthy."
 * @type {number}
 */
WebSocketConnection.responsesRequiredToBeHealthy = 2;
/**
 * Time to wait for the connection te become healthy before giving up.
 * @type {number}
 */
WebSocketConnection.healthyTimeout = 30000;

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Currently simplistic, this class manages what transport a Connection should use at various stages of its
 * lifecycle.
 *
 * It starts with longpolling in a browser, and httppolling on node. It then upgrades to websockets if
 * they are available.
 * @constructor
 */
class TransportManager {
    /**
     * @const
     * @type {!Array.<function(new:Transport, string, RepoInfo, string=)>}
     */
    static get ALL_TRANSPORTS() {
        return [BrowserPollConnection, WebSocketConnection];
    }
    /**
     * @param {!RepoInfo} repoInfo Metadata around the namespace we're connecting to
     */
    constructor(repoInfo) {
        this.initTransports_(repoInfo);
    }
    /**
     * @param {!RepoInfo} repoInfo
     * @private
     */
    initTransports_(repoInfo) {
        const isWebSocketsAvailable = WebSocketConnection && WebSocketConnection['isAvailable']();
        let isSkipPollConnection = isWebSocketsAvailable && !WebSocketConnection.previouslyFailed();
        if (repoInfo.webSocketOnly) {
            if (!isWebSocketsAvailable)
                warn("wss:// URL used, but browser isn't known to support websockets.  Trying anyway.");
            isSkipPollConnection = true;
        }
        if (isSkipPollConnection) {
            this.transports_ = [WebSocketConnection];
        }
        else {
            const transports = (this.transports_ = []);
            each(TransportManager.ALL_TRANSPORTS, (i, transport) => {
                if (transport && transport['isAvailable']()) {
                    transports.push(transport);
                }
            });
        }
    }
    /**
     * @return {function(new:Transport, !string, !RepoInfo, string=, string=)} The constructor for the
     * initial transport to use
     */
    initialTransport() {
        if (this.transports_.length > 0) {
            return this.transports_[0];
        }
        else {
            throw new Error('No transports available');
        }
    }
    /**
     * @return {?function(new:Transport, function(),function(), string=)} The constructor for the next
     * transport, or null
     */
    upgradeTransport() {
        if (this.transports_.length > 1) {
            return this.transports_[1];
        }
        else {
            return null;
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// Abort upgrade attempt if it takes longer than 60s.
const UPGRADE_TIMEOUT = 60000;
// For some transports (WebSockets), we need to "validate" the transport by exchanging a few requests and responses.
// If we haven't sent enough requests within 5s, we'll start sending noop ping requests.
const DELAY_BEFORE_SENDING_EXTRA_REQUESTS = 5000;
// If the initial data sent triggers a lot of bandwidth (i.e. it's a large put or a listen for a large amount of data)
// then we may not be able to exchange our ping/pong requests within the healthy timeout.  So if we reach the timeout
// but we've sent/received enough bytes, we don't cancel the connection.
const BYTES_SENT_HEALTHY_OVERRIDE = 10 * 1024;
const BYTES_RECEIVED_HEALTHY_OVERRIDE = 100 * 1024;
const MESSAGE_TYPE = 't';
const MESSAGE_DATA = 'd';
const CONTROL_SHUTDOWN = 's';
const CONTROL_RESET = 'r';
const CONTROL_ERROR = 'e';
const CONTROL_PONG = 'o';
const SWITCH_ACK = 'a';
const END_TRANSMISSION = 'n';
const PING = 'p';
const SERVER_HELLO = 'h';
/**
 * Creates a new real-time connection to the server using whichever method works
 * best in the current browser.
 *
 * @constructor
 */
class Connection {
    /**
     * @param {!string} id - an id for this connection
     * @param {!RepoInfo} repoInfo_ - the info for the endpoint to connect to
     * @param {function(Object)} onMessage_ - the callback to be triggered when a server-push message arrives
     * @param {function(number, string)} onReady_ - the callback to be triggered when this connection is ready to send messages.
     * @param {function()} onDisconnect_ - the callback to be triggered when a connection was lost
     * @param {function(string)} onKill_ - the callback to be triggered when this connection has permanently shut down.
     * @param {string=} lastSessionId - last session id in persistent connection. is used to clean up old session in real-time server
     */
    constructor(id, repoInfo_, onMessage_, onReady_, onDisconnect_, onKill_, lastSessionId) {
        this.id = id;
        this.repoInfo_ = repoInfo_;
        this.onMessage_ = onMessage_;
        this.onReady_ = onReady_;
        this.onDisconnect_ = onDisconnect_;
        this.onKill_ = onKill_;
        this.lastSessionId = lastSessionId;
        this.connectionCount = 0;
        this.pendingDataMessages = [];
        this.state_ = 0 /* CONNECTING */;
        this.log_ = logWrapper('c:' + this.id + ':');
        this.transportManager_ = new TransportManager(repoInfo_);
        this.log_('Connection created');
        this.start_();
    }
    /**
     * Starts a connection attempt
     * @private
     */
    start_() {
        const conn = this.transportManager_.initialTransport();
        this.conn_ = new conn(this.nextTransportId_(), this.repoInfo_, undefined, this.lastSessionId);
        // For certain transports (WebSockets), we need to send and receive several messages back and forth before we
        // can consider the transport healthy.
        this.primaryResponsesRequired_ = conn['responsesRequiredToBeHealthy'] || 0;
        const onMessageReceived = this.connReceiver_(this.conn_);
        const onConnectionLost = this.disconnReceiver_(this.conn_);
        this.tx_ = this.conn_;
        this.rx_ = this.conn_;
        this.secondaryConn_ = null;
        this.isHealthy_ = false;
        /*
         * Firefox doesn't like when code from one iframe tries to create another iframe by way of the parent frame.
         * This can occur in the case of a redirect, i.e. we guessed wrong on what server to connect to and received a reset.
         * Somehow, setTimeout seems to make this ok. That doesn't make sense from a security perspective, since you should
         * still have the context of your originating frame.
         */
        setTimeout(() => {
            // this.conn_ gets set to null in some of the tests. Check to make sure it still exists before using it
            this.conn_ && this.conn_.open(onMessageReceived, onConnectionLost);
        }, Math.floor(0));
        const healthyTimeout_ms = conn['healthyTimeout'] || 0;
        if (healthyTimeout_ms > 0) {
            this.healthyTimeout_ = setTimeoutNonBlocking(() => {
                this.healthyTimeout_ = null;
                if (!this.isHealthy_) {
                    if (this.conn_ &&
                        this.conn_.bytesReceived > BYTES_RECEIVED_HEALTHY_OVERRIDE) {
                        this.log_('Connection exceeded healthy timeout but has received ' +
                            this.conn_.bytesReceived +
                            ' bytes.  Marking connection healthy.');
                        this.isHealthy_ = true;
                        this.conn_.markConnectionHealthy();
                    }
                    else if (this.conn_ &&
                        this.conn_.bytesSent > BYTES_SENT_HEALTHY_OVERRIDE) {
                        this.log_('Connection exceeded healthy timeout but has sent ' +
                            this.conn_.bytesSent +
                            ' bytes.  Leaving connection alive.');
                        // NOTE: We don't want to mark it healthy, since we have no guarantee that the bytes have made it to
                        // the server.
                    }
                    else {
                        this.log_('Closing unhealthy connection after timeout.');
                        this.close();
                    }
                }
            }, Math.floor(healthyTimeout_ms));
        }
    }
    /**
     * @return {!string}
     * @private
     */
    nextTransportId_() {
        return 'c:' + this.id + ':' + this.connectionCount++;
    }
    disconnReceiver_(conn) {
        return everConnected => {
            if (conn === this.conn_) {
                this.onConnectionLost_(everConnected);
            }
            else if (conn === this.secondaryConn_) {
                this.log_('Secondary connection lost.');
                this.onSecondaryConnectionLost_();
            }
            else {
                this.log_('closing an old connection');
            }
        };
    }
    connReceiver_(conn) {
        return (message) => {
            if (this.state_ != 2 /* DISCONNECTED */) {
                if (conn === this.rx_) {
                    this.onPrimaryMessageReceived_(message);
                }
                else if (conn === this.secondaryConn_) {
                    this.onSecondaryMessageReceived_(message);
                }
                else {
                    this.log_('message on old connection');
                }
            }
        };
    }
    /**
     *
     * @param {Object} dataMsg An arbitrary data message to be sent to the server
     */
    sendRequest(dataMsg) {
        // wrap in a data message envelope and send it on
        const msg = { t: 'd', d: dataMsg };
        this.sendData_(msg);
    }
    tryCleanupConnection() {
        if (this.tx_ === this.secondaryConn_ && this.rx_ === this.secondaryConn_) {
            this.log_('cleaning up and promoting a connection: ' + this.secondaryConn_.connId);
            this.conn_ = this.secondaryConn_;
            this.secondaryConn_ = null;
            // the server will shutdown the old connection
        }
    }
    onSecondaryControl_(controlData) {
        if (MESSAGE_TYPE in controlData) {
            const cmd = controlData[MESSAGE_TYPE];
            if (cmd === SWITCH_ACK) {
                this.upgradeIfSecondaryHealthy_();
            }
            else if (cmd === CONTROL_RESET) {
                // Most likely the session wasn't valid. Abandon the switch attempt
                this.log_('Got a reset on secondary, closing it');
                this.secondaryConn_.close();
                // If we were already using this connection for something, than we need to fully close
                if (this.tx_ === this.secondaryConn_ ||
                    this.rx_ === this.secondaryConn_) {
                    this.close();
                }
            }
            else if (cmd === CONTROL_PONG) {
                this.log_('got pong on secondary.');
                this.secondaryResponsesRequired_--;
                this.upgradeIfSecondaryHealthy_();
            }
        }
    }
    onSecondaryMessageReceived_(parsedData) {
        const layer = requireKey('t', parsedData);
        const data = requireKey('d', parsedData);
        if (layer == 'c') {
            this.onSecondaryControl_(data);
        }
        else if (layer == 'd') {
            // got a data message, but we're still second connection. Need to buffer it up
            this.pendingDataMessages.push(data);
        }
        else {
            throw new Error('Unknown protocol layer: ' + layer);
        }
    }
    upgradeIfSecondaryHealthy_() {
        if (this.secondaryResponsesRequired_ <= 0) {
            this.log_('Secondary connection is healthy.');
            this.isHealthy_ = true;
            this.secondaryConn_.markConnectionHealthy();
            this.proceedWithUpgrade_();
        }
        else {
            // Send a ping to make sure the connection is healthy.
            this.log_('sending ping on secondary.');
            this.secondaryConn_.send({ t: 'c', d: { t: PING, d: {} } });
        }
    }
    proceedWithUpgrade_() {
        // tell this connection to consider itself open
        this.secondaryConn_.start();
        // send ack
        this.log_('sending client ack on secondary');
        this.secondaryConn_.send({ t: 'c', d: { t: SWITCH_ACK, d: {} } });
        // send end packet on primary transport, switch to sending on this one
        // can receive on this one, buffer responses until end received on primary transport
        this.log_('Ending transmission on primary');
        this.conn_.send({ t: 'c', d: { t: END_TRANSMISSION, d: {} } });
        this.tx_ = this.secondaryConn_;
        this.tryCleanupConnection();
    }
    onPrimaryMessageReceived_(parsedData) {
        // Must refer to parsedData properties in quotes, so closure doesn't touch them.
        const layer = requireKey('t', parsedData);
        const data = requireKey('d', parsedData);
        if (layer == 'c') {
            this.onControl_(data);
        }
        else if (layer == 'd') {
            this.onDataMessage_(data);
        }
    }
    onDataMessage_(message) {
        this.onPrimaryResponse_();
        // We don't do anything with data messages, just kick them up a level
        this.onMessage_(message);
    }
    onPrimaryResponse_() {
        if (!this.isHealthy_) {
            this.primaryResponsesRequired_--;
            if (this.primaryResponsesRequired_ <= 0) {
                this.log_('Primary connection is healthy.');
                this.isHealthy_ = true;
                this.conn_.markConnectionHealthy();
            }
        }
    }
    onControl_(controlData) {
        const cmd = requireKey(MESSAGE_TYPE, controlData);
        if (MESSAGE_DATA in controlData) {
            const payload = controlData[MESSAGE_DATA];
            if (cmd === SERVER_HELLO) {
                this.onHandshake_(payload);
            }
            else if (cmd === END_TRANSMISSION) {
                this.log_('recvd end transmission on primary');
                this.rx_ = this.secondaryConn_;
                for (let i = 0; i < this.pendingDataMessages.length; ++i) {
                    this.onDataMessage_(this.pendingDataMessages[i]);
                }
                this.pendingDataMessages = [];
                this.tryCleanupConnection();
            }
            else if (cmd === CONTROL_SHUTDOWN) {
                // This was previously the 'onKill' callback passed to the lower-level connection
                // payload in this case is the reason for the shutdown. Generally a human-readable error
                this.onConnectionShutdown_(payload);
            }
            else if (cmd === CONTROL_RESET) {
                // payload in this case is the host we should contact
                this.onReset_(payload);
            }
            else if (cmd === CONTROL_ERROR) {
                error('Server Error: ' + payload);
            }
            else if (cmd === CONTROL_PONG) {
                this.log_('got pong on primary.');
                this.onPrimaryResponse_();
                this.sendPingOnPrimaryIfNecessary_();
            }
            else {
                error('Unknown control packet command: ' + cmd);
            }
        }
    }
    /**
     *
     * @param {Object} handshake The handshake data returned from the server
     * @private
     */
    onHandshake_(handshake) {
        const timestamp = handshake.ts;
        const version = handshake.v;
        const host = handshake.h;
        this.sessionId = handshake.s;
        this.repoInfo_.updateHost(host);
        // if we've already closed the connection, then don't bother trying to progress further
        if (this.state_ == 0 /* CONNECTING */) {
            this.conn_.start();
            this.onConnectionEstablished_(this.conn_, timestamp);
            if (PROTOCOL_VERSION !== version) {
                warn('Protocol version mismatch detected');
            }
            // TODO: do we want to upgrade? when? maybe a delay?
            this.tryStartUpgrade_();
        }
    }
    tryStartUpgrade_() {
        const conn = this.transportManager_.upgradeTransport();
        if (conn) {
            this.startUpgrade_(conn);
        }
    }
    startUpgrade_(conn) {
        this.secondaryConn_ = new conn(this.nextTransportId_(), this.repoInfo_, this.sessionId);
        // For certain transports (WebSockets), we need to send and receive several messages back and forth before we
        // can consider the transport healthy.
        this.secondaryResponsesRequired_ =
            conn['responsesRequiredToBeHealthy'] || 0;
        const onMessage = this.connReceiver_(this.secondaryConn_);
        const onDisconnect = this.disconnReceiver_(this.secondaryConn_);
        this.secondaryConn_.open(onMessage, onDisconnect);
        // If we haven't successfully upgraded after UPGRADE_TIMEOUT, give up and kill the secondary.
        setTimeoutNonBlocking(() => {
            if (this.secondaryConn_) {
                this.log_('Timed out trying to upgrade.');
                this.secondaryConn_.close();
            }
        }, Math.floor(UPGRADE_TIMEOUT));
    }
    onReset_(host) {
        this.log_('Reset packet received.  New host: ' + host);
        this.repoInfo_.updateHost(host);
        // TODO: if we're already "connected", we need to trigger a disconnect at the next layer up.
        // We don't currently support resets after the connection has already been established
        if (this.state_ === 1 /* CONNECTED */) {
            this.close();
        }
        else {
            // Close whatever connections we have open and start again.
            this.closeConnections_();
            this.start_();
        }
    }
    onConnectionEstablished_(conn, timestamp) {
        this.log_('Realtime connection established.');
        this.conn_ = conn;
        this.state_ = 1 /* CONNECTED */;
        if (this.onReady_) {
            this.onReady_(timestamp, this.sessionId);
            this.onReady_ = null;
        }
        // If after 5 seconds we haven't sent enough requests to the server to get the connection healthy,
        // send some pings.
        if (this.primaryResponsesRequired_ === 0) {
            this.log_('Primary connection is healthy.');
            this.isHealthy_ = true;
        }
        else {
            setTimeoutNonBlocking(() => {
                this.sendPingOnPrimaryIfNecessary_();
            }, Math.floor(DELAY_BEFORE_SENDING_EXTRA_REQUESTS));
        }
    }
    sendPingOnPrimaryIfNecessary_() {
        // If the connection isn't considered healthy yet, we'll send a noop ping packet request.
        if (!this.isHealthy_ && this.state_ === 1 /* CONNECTED */) {
            this.log_('sending ping on primary.');
            this.sendData_({ t: 'c', d: { t: PING, d: {} } });
        }
    }
    onSecondaryConnectionLost_() {
        const conn = this.secondaryConn_;
        this.secondaryConn_ = null;
        if (this.tx_ === conn || this.rx_ === conn) {
            // we are relying on this connection already in some capacity. Therefore, a failure is real
            this.close();
        }
    }
    /**
     *
     * @param {boolean} everConnected Whether or not the connection ever reached a server. Used to determine if
     * we should flush the host cache
     * @private
     */
    onConnectionLost_(everConnected) {
        this.conn_ = null;
        // NOTE: IF you're seeing a Firefox error for this line, I think it might be because it's getting
        // called on window close and RealtimeState.CONNECTING is no longer defined.  Just a guess.
        if (!everConnected && this.state_ === 0 /* CONNECTING */) {
            this.log_('Realtime connection failed.');
            // Since we failed to connect at all, clear any cached entry for this namespace in case the machine went away
            if (this.repoInfo_.isCacheableHost()) {
                PersistentStorage.remove('host:' + this.repoInfo_.host);
                // reset the internal host to what we would show the user, i.e. <ns>.firebaseio.com
                this.repoInfo_.internalHost = this.repoInfo_.host;
            }
        }
        else if (this.state_ === 1 /* CONNECTED */) {
            this.log_('Realtime connection lost.');
        }
        this.close();
    }
    /**
     *
     * @param {string} reason
     * @private
     */
    onConnectionShutdown_(reason) {
        this.log_('Connection shutdown command received. Shutting down...');
        if (this.onKill_) {
            this.onKill_(reason);
            this.onKill_ = null;
        }
        // We intentionally don't want to fire onDisconnect (kill is a different case),
        // so clear the callback.
        this.onDisconnect_ = null;
        this.close();
    }
    sendData_(data) {
        if (this.state_ !== 1 /* CONNECTED */) {
            throw 'Connection is not connected';
        }
        else {
            this.tx_.send(data);
        }
    }
    /**
     * Cleans up this connection, calling the appropriate callbacks
     */
    close() {
        if (this.state_ !== 2 /* DISCONNECTED */) {
            this.log_('Closing realtime connection.');
            this.state_ = 2 /* DISCONNECTED */;
            this.closeConnections_();
            if (this.onDisconnect_) {
                this.onDisconnect_();
                this.onDisconnect_ = null;
            }
        }
    }
    /**
     *
     * @private
     */
    closeConnections_() {
        this.log_('Shutting down all connections');
        if (this.conn_) {
            this.conn_.close();
            this.conn_ = null;
        }
        if (this.secondaryConn_) {
            this.secondaryConn_.close();
            this.secondaryConn_ = null;
        }
        if (this.healthyTimeout_) {
            clearTimeout(this.healthyTimeout_);
            this.healthyTimeout_ = null;
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Interface defining the set of actions that can be performed against the Firebase server
 * (basically corresponds to our wire protocol).
 *
 * @interface
 */
class ServerActions {
    /**
     * @param {string} pathString
     * @param {*} data
     * @param {function(string, string)=} onComplete
     * @param {string=} hash
     */
    put(pathString, data, onComplete, hash) { }
    /**
     * @param {string} pathString
     * @param {*} data
     * @param {function(string, ?string)} onComplete
     * @param {string=} hash
     */
    merge(pathString, data, onComplete, hash) { }
    /**
     * Refreshes the auth token for the current connection.
     * @param {string} token The authentication token
     */
    refreshAuthToken(token) { }
    /**
     * @param {string} pathString
     * @param {*} data
     * @param {function(string, string)=} onComplete
     */
    onDisconnectPut(pathString, data, onComplete) { }
    /**
     * @param {string} pathString
     * @param {*} data
     * @param {function(string, string)=} onComplete
     */
    onDisconnectMerge(pathString, data, onComplete) { }
    /**
     * @param {string} pathString
     * @param {function(string, string)=} onComplete
     */
    onDisconnectCancel(pathString, onComplete) { }
    /**
     * @param {Object.<string, *>} stats
     */
    reportStats(stats) { }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const RECONNECT_MIN_DELAY = 1000;
const RECONNECT_MAX_DELAY_DEFAULT = 60 * 5 * 1000; // 5 minutes in milliseconds (Case: 1858)
const RECONNECT_MAX_DELAY_FOR_ADMINS = 30 * 1000; // 30 seconds for admin clients (likely to be a backend server)
const RECONNECT_DELAY_MULTIPLIER = 1.3;
const RECONNECT_DELAY_RESET_TIMEOUT = 30000; // Reset delay back to MIN_DELAY after being connected for 30sec.
const SERVER_KILL_INTERRUPT_REASON = 'server_kill';
// If auth fails repeatedly, we'll assume something is wrong and log a warning / back off.
const INVALID_AUTH_TOKEN_THRESHOLD = 3;
/**
 * Firebase connection.  Abstracts wire protocol and handles reconnecting.
 *
 * NOTE: All JSON objects sent to the realtime connection must have property names enclosed
 * in quotes to make sure the closure compiler does not minify them.
 */
class PersistentConnection extends ServerActions {
    /**
     * @implements {ServerActions}
     * @param {!RepoInfo} repoInfo_ Data about the namespace we are connecting to
     * @param {function(string, *, boolean, ?number)} onDataUpdate_ A callback for new data from the server
     * @param onConnectStatus_
     * @param onServerInfoUpdate_
     * @param authTokenProvider_
     * @param authOverride_
     */
    constructor(repoInfo_, onDataUpdate_, onConnectStatus_, onServerInfoUpdate_, authTokenProvider_, authOverride_) {
        super();
        this.repoInfo_ = repoInfo_;
        this.onDataUpdate_ = onDataUpdate_;
        this.onConnectStatus_ = onConnectStatus_;
        this.onServerInfoUpdate_ = onServerInfoUpdate_;
        this.authTokenProvider_ = authTokenProvider_;
        this.authOverride_ = authOverride_;
        // Used for diagnostic logging.
        this.id = PersistentConnection.nextPersistentConnectionId_++;
        this.log_ = logWrapper('p:' + this.id + ':');
        /** @private {Object} */
        this.interruptReasons_ = {};
        this.listens_ = {};
        this.outstandingPuts_ = [];
        this.outstandingPutCount_ = 0;
        this.onDisconnectRequestQueue_ = [];
        this.connected_ = false;
        this.reconnectDelay_ = RECONNECT_MIN_DELAY;
        this.maxReconnectDelay_ = RECONNECT_MAX_DELAY_DEFAULT;
        this.securityDebugCallback_ = null;
        this.lastSessionId = null;
        /** @private {number|null} */
        this.establishConnectionTimer_ = null;
        /** @private {boolean} */
        this.visible_ = false;
        // Before we get connected, we keep a queue of pending messages to send.
        this.requestCBHash_ = {};
        this.requestNumber_ = 0;
        /** @private {?{
         *   sendRequest(Object),
         *   close()
         * }} */
        this.realtime_ = null;
        /** @private {string|null} */
        this.authToken_ = null;
        this.forceTokenRefresh_ = false;
        this.invalidAuthTokenCount_ = 0;
        this.firstConnection_ = true;
        this.lastConnectionAttemptTime_ = null;
        this.lastConnectionEstablishedTime_ = null;
        if (authOverride_ && !isNodeSdk()) {
            throw new Error('Auth override specified in options, but not supported on non Node.js platforms');
        }
        this.scheduleConnect_(0);
        VisibilityMonitor.getInstance().on('visible', this.onVisible_, this);
        if (repoInfo_.host.indexOf('fblocal') === -1) {
            OnlineMonitor.getInstance().on('online', this.onOnline_, this);
        }
    }
    /**
     * @param {!string} action
     * @param {*} body
     * @param {function(*)=} onResponse
     * @protected
     */
    sendRequest(action, body, onResponse) {
        const curReqNum = ++this.requestNumber_;
        const msg = { r: curReqNum, a: action, b: body };
        this.log_(stringify(msg));
        assert(this.connected_, "sendRequest call when we're not connected not allowed.");
        this.realtime_.sendRequest(msg);
        if (onResponse) {
            this.requestCBHash_[curReqNum] = onResponse;
        }
    }
    /**
     * @inheritDoc
     */
    listen(query, currentHashFn, tag, onComplete) {
        const queryId = query.queryIdentifier();
        const pathString = query.path.toString();
        this.log_('Listen called for ' + pathString + ' ' + queryId);
        this.listens_[pathString] = this.listens_[pathString] || {};
        assert(query.getQueryParams().isDefault() ||
            !query.getQueryParams().loadsAllData(), 'listen() called for non-default but complete query');
        assert(!this.listens_[pathString][queryId], 'listen() called twice for same path/queryId.');
        const listenSpec = {
            onComplete: onComplete,
            hashFn: currentHashFn,
            query: query,
            tag: tag
        };
        this.listens_[pathString][queryId] = listenSpec;
        if (this.connected_) {
            this.sendListen_(listenSpec);
        }
    }
    /**
     * @param {!{onComplete(),
     *           hashFn():!string,
     *           query: !Query,
     *           tag: ?number}} listenSpec
     * @private
     */
    sendListen_(listenSpec) {
        const query = listenSpec.query;
        const pathString = query.path.toString();
        const queryId = query.queryIdentifier();
        this.log_('Listen on ' + pathString + ' for ' + queryId);
        const req = { /*path*/ p: pathString };
        const action = 'q';
        // Only bother to send query if it's non-default.
        if (listenSpec.tag) {
            req['q'] = query.queryObject();
            req['t'] = listenSpec.tag;
        }
        req[ /*hash*/'h'] = listenSpec.hashFn();
        this.sendRequest(action, req, (message) => {
            const payload = message[ /*data*/'d'];
            const status = message[ /*status*/'s'];
            // print warnings in any case...
            PersistentConnection.warnOnListenWarnings_(payload, query);
            const currentListenSpec = this.listens_[pathString] && this.listens_[pathString][queryId];
            // only trigger actions if the listen hasn't been removed and readded
            if (currentListenSpec === listenSpec) {
                this.log_('listen response', message);
                if (status !== 'ok') {
                    this.removeListen_(pathString, queryId);
                }
                if (listenSpec.onComplete) {
                    listenSpec.onComplete(status, payload);
                }
            }
        });
    }
    /**
     * @param {*} payload
     * @param {!Query} query
     * @private
     */
    static warnOnListenWarnings_(payload, query) {
        if (payload && typeof payload === 'object' && contains(payload, 'w')) {
            const warnings = safeGet(payload, 'w');
            if (Array.isArray(warnings) && ~warnings.indexOf('no_index')) {
                const indexSpec = '".indexOn": "' +
                    query
                        .getQueryParams()
                        .getIndex()
                        .toString() +
                    '"';
                const indexPath = query.path.toString();
                warn(`Using an unspecified index. Your data will be downloaded and ` +
                    `filtered on the client. Consider adding ${indexSpec} at ` +
                    `${indexPath} to your security rules for better performance.`);
            }
        }
    }
    /**
     * @inheritDoc
     */
    refreshAuthToken(token) {
        this.authToken_ = token;
        this.log_('Auth token refreshed');
        if (this.authToken_) {
            this.tryAuth();
        }
        else {
            //If we're connected we want to let the server know to unauthenticate us. If we're not connected, simply delete
            //the credential so we dont become authenticated next time we connect.
            if (this.connected_) {
                this.sendRequest('unauth', {}, () => { });
            }
        }
        this.reduceReconnectDelayIfAdminCredential_(token);
    }
    /**
     * @param {!string} credential
     * @private
     */
    reduceReconnectDelayIfAdminCredential_(credential) {
        // NOTE: This isn't intended to be bulletproof (a malicious developer can always just modify the client).
        // Additionally, we don't bother resetting the max delay back to the default if auth fails / expires.
        const isFirebaseSecret = credential && credential.length === 40;
        if (isFirebaseSecret || isAdmin(credential)) {
            this.log_('Admin auth credential detected.  Reducing max reconnect time.');
            this.maxReconnectDelay_ = RECONNECT_MAX_DELAY_FOR_ADMINS;
        }
    }
    /**
     * Attempts to authenticate with the given credentials. If the authentication attempt fails, it's triggered like
     * a auth revoked (the connection is closed).
     */
    tryAuth() {
        if (this.connected_ && this.authToken_) {
            const token = this.authToken_;
            const authMethod = isValidFormat(token) ? 'auth' : 'gauth';
            const requestData = { cred: token };
            if (this.authOverride_ === null) {
                requestData['noauth'] = true;
            }
            else if (typeof this.authOverride_ === 'object') {
                requestData['authvar'] = this.authOverride_;
            }
            this.sendRequest(authMethod, requestData, (res) => {
                const status = res[ /*status*/'s'];
                const data = res[ /*data*/'d'] || 'error';
                if (this.authToken_ === token) {
                    if (status === 'ok') {
                        this.invalidAuthTokenCount_ = 0;
                    }
                    else {
                        // Triggers reconnect and force refresh for auth token
                        this.onAuthRevoked_(status, data);
                    }
                }
            });
        }
    }
    /**
     * @inheritDoc
     */
    unlisten(query, tag) {
        const pathString = query.path.toString();
        const queryId = query.queryIdentifier();
        this.log_('Unlisten called for ' + pathString + ' ' + queryId);
        assert(query.getQueryParams().isDefault() ||
            !query.getQueryParams().loadsAllData(), 'unlisten() called for non-default but complete query');
        const listen = this.removeListen_(pathString, queryId);
        if (listen && this.connected_) {
            this.sendUnlisten_(pathString, queryId, query.queryObject(), tag);
        }
    }
    sendUnlisten_(pathString, queryId, queryObj, tag) {
        this.log_('Unlisten on ' + pathString + ' for ' + queryId);
        const req = { /*path*/ p: pathString };
        const action = 'n';
        // Only bother sending queryId if it's non-default.
        if (tag) {
            req['q'] = queryObj;
            req['t'] = tag;
        }
        this.sendRequest(action, req);
    }
    /**
     * @inheritDoc
     */
    onDisconnectPut(pathString, data, onComplete) {
        if (this.connected_) {
            this.sendOnDisconnect_('o', pathString, data, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString,
                action: 'o',
                data,
                onComplete
            });
        }
    }
    /**
     * @inheritDoc
     */
    onDisconnectMerge(pathString, data, onComplete) {
        if (this.connected_) {
            this.sendOnDisconnect_('om', pathString, data, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString,
                action: 'om',
                data,
                onComplete
            });
        }
    }
    /**
     * @inheritDoc
     */
    onDisconnectCancel(pathString, onComplete) {
        if (this.connected_) {
            this.sendOnDisconnect_('oc', pathString, null, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString,
                action: 'oc',
                data: null,
                onComplete
            });
        }
    }
    sendOnDisconnect_(action, pathString, data, onComplete) {
        const request = { /*path*/ p: pathString, /*data*/ d: data };
        this.log_('onDisconnect ' + action, request);
        this.sendRequest(action, request, (response) => {
            if (onComplete) {
                setTimeout(function () {
                    onComplete(response[ /*status*/'s'], response[ /* data */'d']);
                }, Math.floor(0));
            }
        });
    }
    /**
     * @inheritDoc
     */
    put(pathString, data, onComplete, hash) {
        this.putInternal('p', pathString, data, onComplete, hash);
    }
    /**
     * @inheritDoc
     */
    merge(pathString, data, onComplete, hash) {
        this.putInternal('m', pathString, data, onComplete, hash);
    }
    putInternal(action, pathString, data, onComplete, hash) {
        const request = {
            /*path*/ p: pathString,
            /*data*/ d: data
        };
        if (hash !== undefined)
            request[ /*hash*/'h'] = hash;
        // TODO: Only keep track of the most recent put for a given path?
        this.outstandingPuts_.push({
            action,
            request,
            onComplete
        });
        this.outstandingPutCount_++;
        const index = this.outstandingPuts_.length - 1;
        if (this.connected_) {
            this.sendPut_(index);
        }
        else {
            this.log_('Buffering put: ' + pathString);
        }
    }
    sendPut_(index) {
        const action = this.outstandingPuts_[index].action;
        const request = this.outstandingPuts_[index].request;
        const onComplete = this.outstandingPuts_[index].onComplete;
        this.outstandingPuts_[index].queued = this.connected_;
        this.sendRequest(action, request, (message) => {
            this.log_(action + ' response', message);
            delete this.outstandingPuts_[index];
            this.outstandingPutCount_--;
            // Clean up array occasionally.
            if (this.outstandingPutCount_ === 0) {
                this.outstandingPuts_ = [];
            }
            if (onComplete)
                onComplete(message[ /*status*/'s'], message[ /* data */'d']);
        });
    }
    /**
     * @inheritDoc
     */
    reportStats(stats) {
        // If we're not connected, we just drop the stats.
        if (this.connected_) {
            const request = { /*counters*/ c: stats };
            this.log_('reportStats', request);
            this.sendRequest(/*stats*/ 's', request, result => {
                const status = result[ /*status*/'s'];
                if (status !== 'ok') {
                    const errorReason = result[ /* data */'d'];
                    this.log_('reportStats', 'Error sending stats: ' + errorReason);
                }
            });
        }
    }
    /**
     * @param {*} message
     * @private
     */
    onDataMessage_(message) {
        if ('r' in message) {
            // this is a response
            this.log_('from server: ' + stringify(message));
            const reqNum = message['r'];
            const onResponse = this.requestCBHash_[reqNum];
            if (onResponse) {
                delete this.requestCBHash_[reqNum];
                onResponse(message[ /*body*/'b']);
            }
        }
        else if ('error' in message) {
            throw 'A server-side error has occurred: ' + message['error'];
        }
        else if ('a' in message) {
            // a and b are action and body, respectively
            this.onDataPush_(message['a'], message['b']);
        }
    }
    onDataPush_(action, body) {
        this.log_('handleServerMessage', action, body);
        if (action === 'd')
            this.onDataUpdate_(body[ /*path*/'p'], body[ /*data*/'d'], 
            /*isMerge*/ false, body['t']);
        else if (action === 'm')
            this.onDataUpdate_(body[ /*path*/'p'], body[ /*data*/'d'], 
            /*isMerge=*/ true, body['t']);
        else if (action === 'c')
            this.onListenRevoked_(body[ /*path*/'p'], body[ /*query*/'q']);
        else if (action === 'ac')
            this.onAuthRevoked_(body[ /*status code*/'s'], body[ /* explanation */'d']);
        else if (action === 'sd')
            this.onSecurityDebugPacket_(body);
        else
            error('Unrecognized action received from server: ' +
                stringify(action) +
                '\nAre you using the latest client?');
    }
    onReady_(timestamp, sessionId) {
        this.log_('connection ready');
        this.connected_ = true;
        this.lastConnectionEstablishedTime_ = new Date().getTime();
        this.handleTimestamp_(timestamp);
        this.lastSessionId = sessionId;
        if (this.firstConnection_) {
            this.sendConnectStats_();
        }
        this.restoreState_();
        this.firstConnection_ = false;
        this.onConnectStatus_(true);
    }
    scheduleConnect_(timeout) {
        assert(!this.realtime_, "Scheduling a connect when we're already connected/ing?");
        if (this.establishConnectionTimer_) {
            clearTimeout(this.establishConnectionTimer_);
        }
        // NOTE: Even when timeout is 0, it's important to do a setTimeout to work around an infuriating "Security Error" in
        // Firefox when trying to write to our long-polling iframe in some scenarios (e.g. Forge or our unit tests).
        this.establishConnectionTimer_ = setTimeout(() => {
            this.establishConnectionTimer_ = null;
            this.establishConnection_();
        }, Math.floor(timeout));
    }
    /**
     * @param {boolean} visible
     * @private
     */
    onVisible_(visible) {
        // NOTE: Tabbing away and back to a window will defeat our reconnect backoff, but I think that's fine.
        if (visible &&
            !this.visible_ &&
            this.reconnectDelay_ === this.maxReconnectDelay_) {
            this.log_('Window became visible.  Reducing delay.');
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
        this.visible_ = visible;
    }
    onOnline_(online) {
        if (online) {
            this.log_('Browser went online.');
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
        else {
            this.log_('Browser went offline.  Killing connection.');
            if (this.realtime_) {
                this.realtime_.close();
            }
        }
    }
    onRealtimeDisconnect_() {
        this.log_('data client disconnected');
        this.connected_ = false;
        this.realtime_ = null;
        // Since we don't know if our sent transactions succeeded or not, we need to cancel them.
        this.cancelSentTransactions_();
        // Clear out the pending requests.
        this.requestCBHash_ = {};
        if (this.shouldReconnect_()) {
            if (!this.visible_) {
                this.log_("Window isn't visible.  Delaying reconnect.");
                this.reconnectDelay_ = this.maxReconnectDelay_;
                this.lastConnectionAttemptTime_ = new Date().getTime();
            }
            else if (this.lastConnectionEstablishedTime_) {
                // If we've been connected long enough, reset reconnect delay to minimum.
                const timeSinceLastConnectSucceeded = new Date().getTime() - this.lastConnectionEstablishedTime_;
                if (timeSinceLastConnectSucceeded > RECONNECT_DELAY_RESET_TIMEOUT)
                    this.reconnectDelay_ = RECONNECT_MIN_DELAY;
                this.lastConnectionEstablishedTime_ = null;
            }
            const timeSinceLastConnectAttempt = new Date().getTime() - this.lastConnectionAttemptTime_;
            let reconnectDelay = Math.max(0, this.reconnectDelay_ - timeSinceLastConnectAttempt);
            reconnectDelay = Math.random() * reconnectDelay;
            this.log_('Trying to reconnect in ' + reconnectDelay + 'ms');
            this.scheduleConnect_(reconnectDelay);
            // Adjust reconnect delay for next time.
            this.reconnectDelay_ = Math.min(this.maxReconnectDelay_, this.reconnectDelay_ * RECONNECT_DELAY_MULTIPLIER);
        }
        this.onConnectStatus_(false);
    }
    establishConnection_() {
        if (this.shouldReconnect_()) {
            this.log_('Making a connection attempt');
            this.lastConnectionAttemptTime_ = new Date().getTime();
            this.lastConnectionEstablishedTime_ = null;
            const onDataMessage = this.onDataMessage_.bind(this);
            const onReady = this.onReady_.bind(this);
            const onDisconnect = this.onRealtimeDisconnect_.bind(this);
            const connId = this.id + ':' + PersistentConnection.nextConnectionId_++;
            const self = this;
            const lastSessionId = this.lastSessionId;
            let canceled = false;
            let connection = null;
            const closeFn = function () {
                if (connection) {
                    connection.close();
                }
                else {
                    canceled = true;
                    onDisconnect();
                }
            };
            const sendRequestFn = function (msg) {
                assert(connection, "sendRequest call when we're not connected not allowed.");
                connection.sendRequest(msg);
            };
            this.realtime_ = {
                close: closeFn,
                sendRequest: sendRequestFn
            };
            const forceRefresh = this.forceTokenRefresh_;
            this.forceTokenRefresh_ = false;
            // First fetch auth token, and establish connection after fetching the token was successful
            this.authTokenProvider_
                .getToken(forceRefresh)
                .then(function (result) {
                if (!canceled) {
                    log('getToken() completed. Creating connection.');
                    self.authToken_ = result && result.accessToken;
                    connection = new Connection(connId, self.repoInfo_, onDataMessage, onReady, onDisconnect, 
                    /* onKill= */ function (reason) {
                        warn(reason + ' (' + self.repoInfo_.toString() + ')');
                        self.interrupt(SERVER_KILL_INTERRUPT_REASON);
                    }, lastSessionId);
                }
                else {
                    log('getToken() completed but was canceled');
                }
            })
                .then(null, function (error) {
                self.log_('Failed to get token: ' + error);
                if (!canceled) {
                    if (CONSTANTS.NODE_ADMIN) {
                        // This may be a critical error for the Admin Node.js SDK, so log a warning.
                        // But getToken() may also just have temporarily failed, so we still want to
                        // continue retrying.
                        warn(error);
                    }
                    closeFn();
                }
            });
        }
    }
    /**
     * @param {string} reason
     */
    interrupt(reason) {
        log('Interrupting connection for reason: ' + reason);
        this.interruptReasons_[reason] = true;
        if (this.realtime_) {
            this.realtime_.close();
        }
        else {
            if (this.establishConnectionTimer_) {
                clearTimeout(this.establishConnectionTimer_);
                this.establishConnectionTimer_ = null;
            }
            if (this.connected_) {
                this.onRealtimeDisconnect_();
            }
        }
    }
    /**
     * @param {string} reason
     */
    resume(reason) {
        log('Resuming connection for reason: ' + reason);
        delete this.interruptReasons_[reason];
        if (isEmpty(this.interruptReasons_)) {
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
    }
    handleTimestamp_(timestamp) {
        const delta = timestamp - new Date().getTime();
        this.onServerInfoUpdate_({ serverTimeOffset: delta });
    }
    cancelSentTransactions_() {
        for (let i = 0; i < this.outstandingPuts_.length; i++) {
            const put = this.outstandingPuts_[i];
            if (put && /*hash*/ 'h' in put.request && put.queued) {
                if (put.onComplete)
                    put.onComplete('disconnect');
                delete this.outstandingPuts_[i];
                this.outstandingPutCount_--;
            }
        }
        // Clean up array occasionally.
        if (this.outstandingPutCount_ === 0)
            this.outstandingPuts_ = [];
    }
    /**
     * @param {!string} pathString
     * @param {Array.<*>=} query
     * @private
     */
    onListenRevoked_(pathString, query) {
        // Remove the listen and manufacture a "permission_denied" error for the failed listen.
        let queryId;
        if (!query) {
            queryId = 'default';
        }
        else {
            queryId = query.map(q => ObjectToUniqueKey(q)).join('$');
        }
        const listen = this.removeListen_(pathString, queryId);
        if (listen && listen.onComplete)
            listen.onComplete('permission_denied');
    }
    /**
     * @param {!string} pathString
     * @param {!string} queryId
     * @return {{queries:Array.<Query>, onComplete:function(string)}}
     * @private
     */
    removeListen_(pathString, queryId) {
        const normalizedPathString = new Path(pathString).toString(); // normalize path.
        let listen;
        if (this.listens_[normalizedPathString] !== undefined) {
            listen = this.listens_[normalizedPathString][queryId];
            delete this.listens_[normalizedPathString][queryId];
            if (getCount(this.listens_[normalizedPathString]) === 0) {
                delete this.listens_[normalizedPathString];
            }
        }
        else {
            // all listens for this path has already been removed
            listen = undefined;
        }
        return listen;
    }
    onAuthRevoked_(statusCode, explanation) {
        log('Auth token revoked: ' + statusCode + '/' + explanation);
        this.authToken_ = null;
        this.forceTokenRefresh_ = true;
        this.realtime_.close();
        if (statusCode === 'invalid_token' || statusCode === 'permission_denied') {
            // We'll wait a couple times before logging the warning / increasing the
            // retry period since oauth tokens will report as "invalid" if they're
            // just expired. Plus there may be transient issues that resolve themselves.
            this.invalidAuthTokenCount_++;
            if (this.invalidAuthTokenCount_ >= INVALID_AUTH_TOKEN_THRESHOLD) {
                // Set a long reconnect delay because recovery is unlikely
                this.reconnectDelay_ = RECONNECT_MAX_DELAY_FOR_ADMINS;
                // Notify the auth token provider that the token is invalid, which will log
                // a warning
                this.authTokenProvider_.notifyForInvalidToken();
            }
        }
    }
    onSecurityDebugPacket_(body) {
        if (this.securityDebugCallback_) {
            this.securityDebugCallback_(body);
        }
        else {
            if ('msg' in body) {
                console.log('FIREBASE: ' + body['msg'].replace('\n', '\nFIREBASE: '));
            }
        }
    }
    restoreState_() {
        //Re-authenticate ourselves if we have a credential stored.
        this.tryAuth();
        // Puts depend on having received the corresponding data update from the server before they complete, so we must
        // make sure to send listens before puts.
        forEach(this.listens_, (pathString, queries) => {
            forEach(queries, (key, listenSpec) => {
                this.sendListen_(listenSpec);
            });
        });
        for (let i = 0; i < this.outstandingPuts_.length; i++) {
            if (this.outstandingPuts_[i])
                this.sendPut_(i);
        }
        while (this.onDisconnectRequestQueue_.length) {
            const request = this.onDisconnectRequestQueue_.shift();
            this.sendOnDisconnect_(request.action, request.pathString, request.data, request.onComplete);
        }
    }
    /**
     * Sends client stats for first connection
     * @private
     */
    sendConnectStats_() {
        const stats = {};
        let clientName = 'js';
        if (CONSTANTS.NODE_ADMIN) {
            clientName = 'admin_node';
        }
        else if (CONSTANTS.NODE_CLIENT) {
            clientName = 'node';
        }
        stats['sdk.' + clientName + '.' + firebase.SDK_VERSION.replace(/\./g, '-')] = 1;
        if (isMobileCordova()) {
            stats['framework.cordova'] = 1;
        }
        else if (isReactNative()) {
            stats['framework.reactnative'] = 1;
        }
        this.reportStats(stats);
    }
    /**
     * @return {boolean}
     * @private
     */
    shouldReconnect_() {
        const online = OnlineMonitor.getInstance().currentlyOnline();
        return isEmpty(this.interruptReasons_) && online;
    }
}
/**
 * @private
 */
PersistentConnection.nextPersistentConnectionId_ = 0;
/**
 * Counter for number of connections created. Mainly used for tagging in the logs
 * @type {number}
 * @private
 */
PersistentConnection.nextConnectionId_ = 0;

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * An implementation of ServerActions that communicates with the server via REST requests.
 * This is mostly useful for compatibility with crawlers, where we don't want to spin up a full
 * persistent connection (using WebSockets or long-polling)
 */
class ReadonlyRestClient extends ServerActions {
    /**
     * @param {!RepoInfo} repoInfo_ Data about the namespace we are connecting to
     * @param {function(string, *, boolean, ?number)} onDataUpdate_ A callback for new data from the server
     * @param {AuthTokenProvider} authTokenProvider_
     * @implements {ServerActions}
     */
    constructor(repoInfo_, onDataUpdate_, authTokenProvider_) {
        super();
        this.repoInfo_ = repoInfo_;
        this.onDataUpdate_ = onDataUpdate_;
        this.authTokenProvider_ = authTokenProvider_;
        /** @private {function(...[*])} */
        this.log_ = logWrapper('p:rest:');
        /**
         * We don't actually need to track listens, except to prevent us calling an onComplete for a listen
         * that's been removed. :-/
         *
         * @private {!Object.<string, !Object>}
         */
        this.listens_ = {};
    }
    reportStats(stats) {
        throw new Error('Method not implemented.');
    }
    /**
     * @param {!Query} query
     * @param {?number=} tag
     * @return {string}
     * @private
     */
    static getListenId_(query, tag) {
        if (tag !== undefined) {
            return 'tag$' + tag;
        }
        else {
            assert(query.getQueryParams().isDefault(), "should have a tag if it's not a default query.");
            return query.path.toString();
        }
    }
    /** @inheritDoc */
    listen(query, currentHashFn, tag, onComplete) {
        const pathString = query.path.toString();
        this.log_('Listen called for ' + pathString + ' ' + query.queryIdentifier());
        // Mark this listener so we can tell if it's removed.
        const listenId = ReadonlyRestClient.getListenId_(query, tag);
        const thisListen = {};
        this.listens_[listenId] = thisListen;
        const queryStringParameters = query
            .getQueryParams()
            .toRestQueryStringParameters();
        this.restRequest_(pathString + '.json', queryStringParameters, (error, result) => {
            let data = result;
            if (error === 404) {
                data = null;
                error = null;
            }
            if (error === null) {
                this.onDataUpdate_(pathString, data, /*isMerge=*/ false, tag);
            }
            if (safeGet(this.listens_, listenId) === thisListen) {
                let status;
                if (!error) {
                    status = 'ok';
                }
                else if (error == 401) {
                    status = 'permission_denied';
                }
                else {
                    status = 'rest_error:' + error;
                }
                onComplete(status, null);
            }
        });
    }
    /** @inheritDoc */
    unlisten(query, tag) {
        const listenId = ReadonlyRestClient.getListenId_(query, tag);
        delete this.listens_[listenId];
    }
    /** @inheritDoc */
    refreshAuthToken(token) {
        // no-op since we just always call getToken.
    }
    /**
     * Performs a REST request to the given path, with the provided query string parameters,
     * and any auth credentials we have.
     *
     * @param {!string} pathString
     * @param {!Object.<string, *>} queryStringParameters
     * @param {?function(?number, *=)} callback
     * @private
     */
    restRequest_(pathString, queryStringParameters = {}, callback) {
        queryStringParameters['format'] = 'export';
        this.authTokenProvider_
            .getToken(/*forceRefresh=*/ false)
            .then(authTokenData => {
            const authToken = authTokenData && authTokenData.accessToken;
            if (authToken) {
                queryStringParameters['auth'] = authToken;
            }
            const url = (this.repoInfo_.secure ? 'https://' : 'http://') +
                this.repoInfo_.host +
                pathString +
                '?' +
                'ns=' +
                this.repoInfo_.namespace +
                querystring(queryStringParameters);
            this.log_('Sending REST request for ' + url);
            const xhr = new XMLHttpRequest();
            xhr.onreadystatechange = () => {
                if (callback && xhr.readyState === 4) {
                    this.log_('REST Response for ' + url + ' received. status:', xhr.status, 'response:', xhr.responseText);
                    let res = null;
                    if (xhr.status >= 200 && xhr.status < 300) {
                        try {
                            res = jsonEval(xhr.responseText);
                        }
                        catch (e) {
                            warn('Failed to parse JSON response for ' +
                                url +
                                ': ' +
                                xhr.responseText);
                        }
                        callback(null, res);
                    }
                    else {
                        // 401 and 404 are expected.
                        if (xhr.status !== 401 && xhr.status !== 404) {
                            warn('Got unsuccessful REST response for ' +
                                url +
                                ' Status: ' +
                                xhr.status);
                        }
                        callback(xhr.status);
                    }
                    callback = null;
                }
            };
            xhr.open('GET', url, /*asynchronous=*/ true);
            xhr.send();
        });
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const INTERRUPT_REASON = 'repo_interrupt';
/**
 * A connection to a single data repository.
 */
class Repo {
    /**
     * @param {!RepoInfo} repoInfo_
     * @param {boolean} forceRestClient
     * @param {!FirebaseApp} app
     */
    constructor(repoInfo_, forceRestClient, app) {
        this.repoInfo_ = repoInfo_;
        this.app = app;
        this.dataUpdateCount = 0;
        this.statsListener_ = null;
        this.eventQueue_ = new EventQueue();
        this.nextWriteId_ = 1;
        this.interceptServerDataCallback_ = null;
        // A list of data pieces and paths to be set when this client disconnects.
        this.onDisconnect_ = new SparseSnapshotTree();
        /**
         * TODO: This should be @private but it's used by test_access.js and internal.js
         * @type {?PersistentConnection}
         */
        this.persistentConnection_ = null;
        /** @type {!AuthTokenProvider} */
        const authTokenProvider = new AuthTokenProvider(app);
        this.stats_ = StatsManager.getCollection(repoInfo_);
        if (forceRestClient || beingCrawled()) {
            this.server_ = new ReadonlyRestClient(this.repoInfo_, this.onDataUpdate_.bind(this), authTokenProvider);
            // Minor hack: Fire onConnect immediately, since there's no actual connection.
            setTimeout(this.onConnectStatus_.bind(this, true), 0);
        }
        else {
            const authOverride = app.options['databaseAuthVariableOverride'];
            // Validate authOverride
            if (typeof authOverride !== 'undefined' && authOverride !== null) {
                if (typeof authOverride !== 'object') {
                    throw new Error('Only objects are supported for option databaseAuthVariableOverride');
                }
                try {
                    stringify(authOverride);
                }
                catch (e) {
                    throw new Error('Invalid authOverride provided: ' + e);
                }
            }
            this.persistentConnection_ = new PersistentConnection(this.repoInfo_, this.onDataUpdate_.bind(this), this.onConnectStatus_.bind(this), this.onServerInfoUpdate_.bind(this), authTokenProvider, authOverride);
            this.server_ = this.persistentConnection_;
        }
        authTokenProvider.addTokenChangeListener(token => {
            this.server_.refreshAuthToken(token);
        });
        // In the case of multiple Repos for the same repoInfo (i.e. there are multiple Firebase.Contexts being used),
        // we only want to create one StatsReporter.  As such, we'll report stats over the first Repo created.
        this.statsReporter_ = StatsManager.getOrCreateReporter(repoInfo_, () => new StatsReporter(this.stats_, this.server_));
        this.transactions_init_();
        // Used for .info.
        this.infoData_ = new SnapshotHolder();
        this.infoSyncTree_ = new SyncTree({
            startListening: (query, tag, currentHashFn, onComplete) => {
                let infoEvents = [];
                const node = this.infoData_.getNode(query.path);
                // This is possibly a hack, but we have different semantics for .info endpoints. We don't raise null events
                // on initial data...
                if (!node.isEmpty()) {
                    infoEvents = this.infoSyncTree_.applyServerOverwrite(query.path, node);
                    setTimeout(() => {
                        onComplete('ok');
                    }, 0);
                }
                return infoEvents;
            },
            stopListening: () => { }
        });
        this.updateInfo_('connected', false);
        this.serverSyncTree_ = new SyncTree({
            startListening: (query, tag, currentHashFn, onComplete) => {
                this.server_.listen(query, currentHashFn, tag, (status, data) => {
                    const events = onComplete(status, data);
                    this.eventQueue_.raiseEventsForChangedPath(query.path, events);
                });
                // No synchronous events for network-backed sync trees
                return [];
            },
            stopListening: (query, tag) => {
                this.server_.unlisten(query, tag);
            }
        });
    }
    /**
     * @return {string}  The URL corresponding to the root of this Firebase.
     */
    toString() {
        return ((this.repoInfo_.secure ? 'https://' : 'http://') + this.repoInfo_.host);
    }
    /**
     * @return {!string} The namespace represented by the repo.
     */
    name() {
        return this.repoInfo_.namespace;
    }
    /**
     * @return {!number} The time in milliseconds, taking the server offset into account if we have one.
     */
    serverTime() {
        const offsetNode = this.infoData_.getNode(new Path('.info/serverTimeOffset'));
        const offset = offsetNode.val() || 0;
        return new Date().getTime() + offset;
    }
    /**
     * Generate ServerValues using some variables from the repo object.
     * @return {!Object}
     */
    generateServerValues() {
        return generateWithValues({
            timestamp: this.serverTime()
        });
    }
    /**
     * Called by realtime when we get new messages from the server.
     *
     * @private
     * @param {string} pathString
     * @param {*} data
     * @param {boolean} isMerge
     * @param {?number} tag
     */
    onDataUpdate_(pathString, data, isMerge, tag) {
        // For testing.
        this.dataUpdateCount++;
        const path = new Path(pathString);
        data = this.interceptServerDataCallback_
            ? this.interceptServerDataCallback_(pathString, data)
            : data;
        let events = [];
        if (tag) {
            if (isMerge) {
                const taggedChildren = map(data, (raw) => nodeFromJSON$1(raw));
                events = this.serverSyncTree_.applyTaggedQueryMerge(path, taggedChildren, tag);
            }
            else {
                const taggedSnap = nodeFromJSON$1(data);
                events = this.serverSyncTree_.applyTaggedQueryOverwrite(path, taggedSnap, tag);
            }
        }
        else if (isMerge) {
            const changedChildren = map(data, (raw) => nodeFromJSON$1(raw));
            events = this.serverSyncTree_.applyServerMerge(path, changedChildren);
        }
        else {
            const snap = nodeFromJSON$1(data);
            events = this.serverSyncTree_.applyServerOverwrite(path, snap);
        }
        let affectedPath = path;
        if (events.length > 0) {
            // Since we have a listener outstanding for each transaction, receiving any events
            // is a proxy for some change having occurred.
            affectedPath = this.rerunTransactions_(path);
        }
        this.eventQueue_.raiseEventsForChangedPath(affectedPath, events);
    }
    /**
     * TODO: This should be @private but it's used by test_access.js and internal.js
     * @param {?function(!string, *):*} callback
     * @private
     */
    interceptServerData_(callback) {
        this.interceptServerDataCallback_ = callback;
    }
    /**
     * @param {!boolean} connectStatus
     * @private
     */
    onConnectStatus_(connectStatus) {
        this.updateInfo_('connected', connectStatus);
        if (connectStatus === false) {
            this.runOnDisconnectEvents_();
        }
    }
    /**
     * @param {!Object} updates
     * @private
     */
    onServerInfoUpdate_(updates) {
        each(updates, (value, key) => {
            this.updateInfo_(key, value);
        });
    }
    /**
     *
     * @param {!string} pathString
     * @param {*} value
     * @private
     */
    updateInfo_(pathString, value) {
        const path = new Path('/.info/' + pathString);
        const newNode = nodeFromJSON$1(value);
        this.infoData_.updateSnapshot(path, newNode);
        const events = this.infoSyncTree_.applyServerOverwrite(path, newNode);
        this.eventQueue_.raiseEventsForChangedPath(path, events);
    }
    /**
     * @return {!number}
     * @private
     */
    getNextWriteId_() {
        return this.nextWriteId_++;
    }
    /**
     * @param {!Path} path
     * @param {*} newVal
     * @param {number|string|null} newPriority
     * @param {?function(?Error, *=)} onComplete
     */
    setWithPriority(path, newVal, newPriority, onComplete) {
        this.log_('set', {
            path: path.toString(),
            value: newVal,
            priority: newPriority
        });
        // TODO: Optimize this behavior to either (a) store flag to skip resolving where possible and / or
        // (b) store unresolved paths on JSON parse
        const serverValues = this.generateServerValues();
        const newNodeUnresolved = nodeFromJSON$1(newVal, newPriority);
        const newNode = resolveDeferredValueSnapshot(newNodeUnresolved, serverValues);
        const writeId = this.getNextWriteId_();
        const events = this.serverSyncTree_.applyUserOverwrite(path, newNode, writeId, true);
        this.eventQueue_.queueEvents(events);
        this.server_.put(path.toString(), newNodeUnresolved.val(/*export=*/ true), (status, errorReason) => {
            const success = status === 'ok';
            if (!success) {
                warn('set at ' + path + ' failed: ' + status);
            }
            const clearEvents = this.serverSyncTree_.ackUserWrite(writeId, !success);
            this.eventQueue_.raiseEventsForChangedPath(path, clearEvents);
            this.callOnCompleteCallback(onComplete, status, errorReason);
        });
        const affectedPath = this.abortTransactions_(path);
        this.rerunTransactions_(affectedPath);
        // We queued the events above, so just flush the queue here
        this.eventQueue_.raiseEventsForChangedPath(affectedPath, []);
    }
    /**
     * @param {!Path} path
     * @param {!Object} childrenToMerge
     * @param {?function(?Error, *=)} onComplete
     */
    update(path, childrenToMerge, onComplete) {
        this.log_('update', { path: path.toString(), value: childrenToMerge });
        // Start with our existing data and merge each child into it.
        let empty = true;
        const serverValues = this.generateServerValues();
        const changedChildren = {};
        forEach(childrenToMerge, (changedKey, changedValue) => {
            empty = false;
            const newNodeUnresolved = nodeFromJSON$1(changedValue);
            changedChildren[changedKey] = resolveDeferredValueSnapshot(newNodeUnresolved, serverValues);
        });
        if (!empty) {
            const writeId = this.getNextWriteId_();
            const events = this.serverSyncTree_.applyUserMerge(path, changedChildren, writeId);
            this.eventQueue_.queueEvents(events);
            this.server_.merge(path.toString(), childrenToMerge, (status, errorReason) => {
                const success = status === 'ok';
                if (!success) {
                    warn('update at ' + path + ' failed: ' + status);
                }
                const clearEvents = this.serverSyncTree_.ackUserWrite(writeId, !success);
                const affectedPath = clearEvents.length > 0 ? this.rerunTransactions_(path) : path;
                this.eventQueue_.raiseEventsForChangedPath(affectedPath, clearEvents);
                this.callOnCompleteCallback(onComplete, status, errorReason);
            });
            forEach(childrenToMerge, (changedPath) => {
                const affectedPath = this.abortTransactions_(path.child(changedPath));
                this.rerunTransactions_(affectedPath);
            });
            // We queued the events above, so just flush the queue here
            this.eventQueue_.raiseEventsForChangedPath(path, []);
        }
        else {
            log("update() called with empty data.  Don't do anything.");
            this.callOnCompleteCallback(onComplete, 'ok');
        }
    }
    /**
     * Applies all of the changes stored up in the onDisconnect_ tree.
     * @private
     */
    runOnDisconnectEvents_() {
        this.log_('onDisconnectEvents');
        const serverValues = this.generateServerValues();
        const resolvedOnDisconnectTree = resolveDeferredValueTree(this.onDisconnect_, serverValues);
        let events = [];
        resolvedOnDisconnectTree.forEachTree(Path.Empty, (path, snap) => {
            events = events.concat(this.serverSyncTree_.applyServerOverwrite(path, snap));
            const affectedPath = this.abortTransactions_(path);
            this.rerunTransactions_(affectedPath);
        });
        this.onDisconnect_ = new SparseSnapshotTree();
        this.eventQueue_.raiseEventsForChangedPath(Path.Empty, events);
    }
    /**
     * @param {!Path} path
     * @param {?function(?Error, *=)} onComplete
     */
    onDisconnectCancel(path, onComplete) {
        this.server_.onDisconnectCancel(path.toString(), (status, errorReason) => {
            if (status === 'ok') {
                this.onDisconnect_.forget(path);
            }
            this.callOnCompleteCallback(onComplete, status, errorReason);
        });
    }
    /**
     * @param {!Path} path
     * @param {*} value
     * @param {?function(?Error, *=)} onComplete
     */
    onDisconnectSet(path, value, onComplete) {
        const newNode = nodeFromJSON$1(value);
        this.server_.onDisconnectPut(path.toString(), newNode.val(/*export=*/ true), (status, errorReason) => {
            if (status === 'ok') {
                this.onDisconnect_.remember(path, newNode);
            }
            this.callOnCompleteCallback(onComplete, status, errorReason);
        });
    }
    /**
     * @param {!Path} path
     * @param {*} value
     * @param {*} priority
     * @param {?function(?Error, *=)} onComplete
     */
    onDisconnectSetWithPriority(path, value, priority, onComplete) {
        const newNode = nodeFromJSON$1(value, priority);
        this.server_.onDisconnectPut(path.toString(), newNode.val(/*export=*/ true), (status, errorReason) => {
            if (status === 'ok') {
                this.onDisconnect_.remember(path, newNode);
            }
            this.callOnCompleteCallback(onComplete, status, errorReason);
        });
    }
    /**
     * @param {!Path} path
     * @param {*} childrenToMerge
     * @param {?function(?Error, *=)} onComplete
     */
    onDisconnectUpdate(path, childrenToMerge, onComplete) {
        if (isEmpty(childrenToMerge)) {
            log("onDisconnect().update() called with empty data.  Don't do anything.");
            this.callOnCompleteCallback(onComplete, 'ok');
            return;
        }
        this.server_.onDisconnectMerge(path.toString(), childrenToMerge, (status, errorReason) => {
            if (status === 'ok') {
                forEach(childrenToMerge, (childName, childNode) => {
                    const newChildNode = nodeFromJSON$1(childNode);
                    this.onDisconnect_.remember(path.child(childName), newChildNode);
                });
            }
            this.callOnCompleteCallback(onComplete, status, errorReason);
        });
    }
    /**
     * @param {!Query} query
     * @param {!EventRegistration} eventRegistration
     */
    addEventCallbackForQuery(query, eventRegistration) {
        let events;
        if (query.path.getFront() === '.info') {
            events = this.infoSyncTree_.addEventRegistration(query, eventRegistration);
        }
        else {
            events = this.serverSyncTree_.addEventRegistration(query, eventRegistration);
        }
        this.eventQueue_.raiseEventsAtPath(query.path, events);
    }
    /**
     * @param {!Query} query
     * @param {?EventRegistration} eventRegistration
     */
    removeEventCallbackForQuery(query, eventRegistration) {
        // These are guaranteed not to raise events, since we're not passing in a cancelError. However, we can future-proof
        // a little bit by handling the return values anyways.
        let events;
        if (query.path.getFront() === '.info') {
            events = this.infoSyncTree_.removeEventRegistration(query, eventRegistration);
        }
        else {
            events = this.serverSyncTree_.removeEventRegistration(query, eventRegistration);
        }
        this.eventQueue_.raiseEventsAtPath(query.path, events);
    }
    interrupt() {
        if (this.persistentConnection_) {
            this.persistentConnection_.interrupt(INTERRUPT_REASON);
        }
    }
    resume() {
        if (this.persistentConnection_) {
            this.persistentConnection_.resume(INTERRUPT_REASON);
        }
    }
    stats(showDelta = false) {
        if (typeof console === 'undefined')
            return;
        let stats;
        if (showDelta) {
            if (!this.statsListener_)
                this.statsListener_ = new StatsListener(this.stats_);
            stats = this.statsListener_.get();
        }
        else {
            stats = this.stats_.get();
        }
        const longestName = Object.keys(stats).reduce((previousValue, currentValue) => Math.max(currentValue.length, previousValue), 0);
        forEach(stats, (stat, value) => {
            // pad stat names to be the same length (plus 2 extra spaces).
            for (let i = stat.length; i < longestName + 2; i++)
                stat += ' ';
            console.log(stat + value);
        });
    }
    statsIncrementCounter(metric) {
        this.stats_.incrementCounter(metric);
        this.statsReporter_.includeStat(metric);
    }
    /**
     * @param {...*} var_args
     * @private
     */
    log_(...var_args) {
        let prefix = '';
        if (this.persistentConnection_) {
            prefix = this.persistentConnection_.id + ':';
        }
        log(prefix, ...var_args);
    }
    /**
     * @param {?function(?Error, *=)} callback
     * @param {!string} status
     * @param {?string=} errorReason
     */
    callOnCompleteCallback(callback, status, errorReason) {
        if (callback) {
            exceptionGuard(function () {
                if (status == 'ok') {
                    callback(null);
                }
                else {
                    const code = (status || 'error').toUpperCase();
                    let message = code;
                    if (errorReason)
                        message += ': ' + errorReason;
                    const error = new Error(message);
                    error.code = code;
                    callback(error);
                }
            });
        }
    }
    get database() {
        return this.__database || (this.__database = new Database(this));
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Filters nodes by range and uses an IndexFilter to track any changes after filtering the node
 *
 * @constructor
 * @implements {NodeFilter}
 */
class RangedFilter {
    /**
     * @param {!QueryParams} params
     */
    constructor(params) {
        this.indexedFilter_ = new IndexedFilter(params.getIndex());
        this.index_ = params.getIndex();
        this.startPost_ = RangedFilter.getStartPost_(params);
        this.endPost_ = RangedFilter.getEndPost_(params);
    }
    /**
     * @return {!NamedNode}
     */
    getStartPost() {
        return this.startPost_;
    }
    /**
     * @return {!NamedNode}
     */
    getEndPost() {
        return this.endPost_;
    }
    /**
     * @param {!NamedNode} node
     * @return {boolean}
     */
    matches(node) {
        return (this.index_.compare(this.getStartPost(), node) <= 0 &&
            this.index_.compare(node, this.getEndPost()) <= 0);
    }
    /**
     * @inheritDoc
     */
    updateChild(snap, key, newChild, affectedPath, source, optChangeAccumulator) {
        if (!this.matches(new NamedNode(key, newChild))) {
            newChild = ChildrenNode.EMPTY_NODE;
        }
        return this.indexedFilter_.updateChild(snap, key, newChild, affectedPath, source, optChangeAccumulator);
    }
    /**
     * @inheritDoc
     */
    updateFullNode(oldSnap, newSnap, optChangeAccumulator) {
        if (newSnap.isLeafNode()) {
            // Make sure we have a children node with the correct index, not a leaf node;
            newSnap = ChildrenNode.EMPTY_NODE;
        }
        let filtered = newSnap.withIndex(this.index_);
        // Don't support priorities on queries
        filtered = filtered.updatePriority(ChildrenNode.EMPTY_NODE);
        const self = this;
        newSnap.forEachChild(PRIORITY_INDEX, function (key, childNode) {
            if (!self.matches(new NamedNode(key, childNode))) {
                filtered = filtered.updateImmediateChild(key, ChildrenNode.EMPTY_NODE);
            }
        });
        return this.indexedFilter_.updateFullNode(oldSnap, filtered, optChangeAccumulator);
    }
    /**
     * @inheritDoc
     */
    updatePriority(oldSnap, newPriority) {
        // Don't support priorities on queries
        return oldSnap;
    }
    /**
     * @inheritDoc
     */
    filtersNodes() {
        return true;
    }
    /**
     * @inheritDoc
     */
    getIndexedFilter() {
        return this.indexedFilter_;
    }
    /**
     * @inheritDoc
     */
    getIndex() {
        return this.index_;
    }
    /**
     * @param {!QueryParams} params
     * @return {!NamedNode}
     * @private
     */
    static getStartPost_(params) {
        if (params.hasStart()) {
            const startName = params.getIndexStartName();
            return params.getIndex().makePost(params.getIndexStartValue(), startName);
        }
        else {
            return params.getIndex().minPost();
        }
    }
    /**
     * @param {!QueryParams} params
     * @return {!NamedNode}
     * @private
     */
    static getEndPost_(params) {
        if (params.hasEnd()) {
            const endName = params.getIndexEndName();
            return params.getIndex().makePost(params.getIndexEndValue(), endName);
        }
        else {
            return params.getIndex().maxPost();
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Applies a limit and a range to a node and uses RangedFilter to do the heavy lifting where possible
 *
 * @constructor
 * @implements {NodeFilter}
 */
class LimitedFilter {
    /**
     * @param {!QueryParams} params
     */
    constructor(params) {
        this.rangedFilter_ = new RangedFilter(params);
        this.index_ = params.getIndex();
        this.limit_ = params.getLimit();
        this.reverse_ = !params.isViewFromLeft();
    }
    /**
     * @inheritDoc
     */
    updateChild(snap, key, newChild, affectedPath, source, optChangeAccumulator) {
        if (!this.rangedFilter_.matches(new NamedNode(key, newChild))) {
            newChild = ChildrenNode.EMPTY_NODE;
        }
        if (snap.getImmediateChild(key).equals(newChild)) {
            // No change
            return snap;
        }
        else if (snap.numChildren() < this.limit_) {
            return this.rangedFilter_
                .getIndexedFilter()
                .updateChild(snap, key, newChild, affectedPath, source, optChangeAccumulator);
        }
        else {
            return this.fullLimitUpdateChild_(snap, key, newChild, source, optChangeAccumulator);
        }
    }
    /**
     * @inheritDoc
     */
    updateFullNode(oldSnap, newSnap, optChangeAccumulator) {
        let filtered;
        if (newSnap.isLeafNode() || newSnap.isEmpty()) {
            // Make sure we have a children node with the correct index, not a leaf node;
            filtered = ChildrenNode.EMPTY_NODE.withIndex(this.index_);
        }
        else {
            if (this.limit_ * 2 < newSnap.numChildren() &&
                newSnap.isIndexed(this.index_)) {
                // Easier to build up a snapshot, since what we're given has more than twice the elements we want
                filtered = ChildrenNode.EMPTY_NODE.withIndex(this.index_);
                // anchor to the startPost, endPost, or last element as appropriate
                let iterator;
                if (this.reverse_) {
                    iterator = newSnap.getReverseIteratorFrom(this.rangedFilter_.getEndPost(), this.index_);
                }
                else {
                    iterator = newSnap.getIteratorFrom(this.rangedFilter_.getStartPost(), this.index_);
                }
                let count = 0;
                while (iterator.hasNext() && count < this.limit_) {
                    const next = iterator.getNext();
                    let inRange;
                    if (this.reverse_) {
                        inRange =
                            this.index_.compare(this.rangedFilter_.getStartPost(), next) <= 0;
                    }
                    else {
                        inRange =
                            this.index_.compare(next, this.rangedFilter_.getEndPost()) <= 0;
                    }
                    if (inRange) {
                        filtered = filtered.updateImmediateChild(next.name, next.node);
                        count++;
                    }
                    else {
                        // if we have reached the end post, we cannot keep adding elemments
                        break;
                    }
                }
            }
            else {
                // The snap contains less than twice the limit. Faster to delete from the snap than build up a new one
                filtered = newSnap.withIndex(this.index_);
                // Don't support priorities on queries
                filtered = filtered.updatePriority(ChildrenNode.EMPTY_NODE);
                let startPost;
                let endPost;
                let cmp;
                let iterator;
                if (this.reverse_) {
                    iterator = filtered.getReverseIterator(this.index_);
                    startPost = this.rangedFilter_.getEndPost();
                    endPost = this.rangedFilter_.getStartPost();
                    const indexCompare = this.index_.getCompare();
                    cmp = (a, b) => indexCompare(b, a);
                }
                else {
                    iterator = filtered.getIterator(this.index_);
                    startPost = this.rangedFilter_.getStartPost();
                    endPost = this.rangedFilter_.getEndPost();
                    cmp = this.index_.getCompare();
                }
                let count = 0;
                let foundStartPost = false;
                while (iterator.hasNext()) {
                    let next = iterator.getNext();
                    if (!foundStartPost && cmp(startPost, next) <= 0) {
                        // start adding
                        foundStartPost = true;
                    }
                    let inRange = foundStartPost && count < this.limit_ && cmp(next, endPost) <= 0;
                    if (inRange) {
                        count++;
                    }
                    else {
                        filtered = filtered.updateImmediateChild(next.name, ChildrenNode.EMPTY_NODE);
                    }
                }
            }
        }
        return this.rangedFilter_
            .getIndexedFilter()
            .updateFullNode(oldSnap, filtered, optChangeAccumulator);
    }
    /**
     * @inheritDoc
     */
    updatePriority(oldSnap, newPriority) {
        // Don't support priorities on queries
        return oldSnap;
    }
    /**
     * @inheritDoc
     */
    filtersNodes() {
        return true;
    }
    /**
     * @inheritDoc
     */
    getIndexedFilter() {
        return this.rangedFilter_.getIndexedFilter();
    }
    /**
     * @inheritDoc
     */
    getIndex() {
        return this.index_;
    }
    /**
     * @param {!Node} snap
     * @param {string} childKey
     * @param {!Node} childSnap
     * @param {!CompleteChildSource} source
     * @param {?ChildChangeAccumulator} changeAccumulator
     * @return {!Node}
     * @private
     */
    fullLimitUpdateChild_(snap, childKey, childSnap, source, changeAccumulator) {
        // TODO: rename all cache stuff etc to general snap terminology
        let cmp;
        if (this.reverse_) {
            const indexCmp = this.index_.getCompare();
            cmp = (a, b) => indexCmp(b, a);
        }
        else {
            cmp = this.index_.getCompare();
        }
        const oldEventCache = snap;
        assert(oldEventCache.numChildren() == this.limit_, '');
        const newChildNamedNode = new NamedNode(childKey, childSnap);
        const windowBoundary = this.reverse_
            ? oldEventCache.getFirstChild(this.index_)
            : oldEventCache.getLastChild(this.index_);
        const inRange = this.rangedFilter_.matches(newChildNamedNode);
        if (oldEventCache.hasChild(childKey)) {
            const oldChildSnap = oldEventCache.getImmediateChild(childKey);
            let nextChild = source.getChildAfterChild(this.index_, windowBoundary, this.reverse_);
            while (nextChild != null &&
                (nextChild.name == childKey || oldEventCache.hasChild(nextChild.name))) {
                // There is a weird edge case where a node is updated as part of a merge in the write tree, but hasn't
                // been applied to the limited filter yet. Ignore this next child which will be updated later in
                // the limited filter...
                nextChild = source.getChildAfterChild(this.index_, nextChild, this.reverse_);
            }
            const compareNext = nextChild == null ? 1 : cmp(nextChild, newChildNamedNode);
            const remainsInWindow = inRange && !childSnap.isEmpty() && compareNext >= 0;
            if (remainsInWindow) {
                if (changeAccumulator != null) {
                    changeAccumulator.trackChildChange(Change.childChangedChange(childKey, childSnap, oldChildSnap));
                }
                return oldEventCache.updateImmediateChild(childKey, childSnap);
            }
            else {
                if (changeAccumulator != null) {
                    changeAccumulator.trackChildChange(Change.childRemovedChange(childKey, oldChildSnap));
                }
                const newEventCache = oldEventCache.updateImmediateChild(childKey, ChildrenNode.EMPTY_NODE);
                const nextChildInRange = nextChild != null && this.rangedFilter_.matches(nextChild);
                if (nextChildInRange) {
                    if (changeAccumulator != null) {
                        changeAccumulator.trackChildChange(Change.childAddedChange(nextChild.name, nextChild.node));
                    }
                    return newEventCache.updateImmediateChild(nextChild.name, nextChild.node);
                }
                else {
                    return newEventCache;
                }
            }
        }
        else if (childSnap.isEmpty()) {
            // we're deleting a node, but it was not in the window, so ignore it
            return snap;
        }
        else if (inRange) {
            if (cmp(windowBoundary, newChildNamedNode) >= 0) {
                if (changeAccumulator != null) {
                    changeAccumulator.trackChildChange(Change.childRemovedChange(windowBoundary.name, windowBoundary.node));
                    changeAccumulator.trackChildChange(Change.childAddedChange(childKey, childSnap));
                }
                return oldEventCache
                    .updateImmediateChild(childKey, childSnap)
                    .updateImmediateChild(windowBoundary.name, ChildrenNode.EMPTY_NODE);
            }
            else {
                return snap;
            }
        }
        else {
            return snap;
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * This class is an immutable-from-the-public-api struct containing a set of query parameters defining a
 * range to be returned for a particular location. It is assumed that validation of parameters is done at the
 * user-facing API level, so it is not done here.
 * @constructor
 */
class QueryParams {
    constructor() {
        this.limitSet_ = false;
        this.startSet_ = false;
        this.startNameSet_ = false;
        this.endSet_ = false;
        this.endNameSet_ = false;
        this.limit_ = 0;
        this.viewFrom_ = '';
        this.indexStartValue_ = null;
        this.indexStartName_ = '';
        this.indexEndValue_ = null;
        this.indexEndName_ = '';
        this.index_ = PRIORITY_INDEX;
    }
    /**
     * @return {boolean}
     */
    hasStart() {
        return this.startSet_;
    }
    /**
     * @return {boolean} True if it would return from left.
     */
    isViewFromLeft() {
        if (this.viewFrom_ === '') {
            // limit(), rather than limitToFirst or limitToLast was called.
            // This means that only one of startSet_ and endSet_ is true. Use them
            // to calculate which side of the view to anchor to. If neither is set,
            // anchor to the end.
            return this.startSet_;
        }
        else {
            return (this.viewFrom_ === QueryParams.WIRE_PROTOCOL_CONSTANTS_.VIEW_FROM_LEFT);
        }
    }
    /**
     * Only valid to call if hasStart() returns true
     * @return {*}
     */
    getIndexStartValue() {
        assert(this.startSet_, 'Only valid if start has been set');
        return this.indexStartValue_;
    }
    /**
     * Only valid to call if hasStart() returns true.
     * Returns the starting key name for the range defined by these query parameters
     * @return {!string}
     */
    getIndexStartName() {
        assert(this.startSet_, 'Only valid if start has been set');
        if (this.startNameSet_) {
            return this.indexStartName_;
        }
        else {
            return MIN_NAME;
        }
    }
    /**
     * @return {boolean}
     */
    hasEnd() {
        return this.endSet_;
    }
    /**
     * Only valid to call if hasEnd() returns true.
     * @return {*}
     */
    getIndexEndValue() {
        assert(this.endSet_, 'Only valid if end has been set');
        return this.indexEndValue_;
    }
    /**
     * Only valid to call if hasEnd() returns true.
     * Returns the end key name for the range defined by these query parameters
     * @return {!string}
     */
    getIndexEndName() {
        assert(this.endSet_, 'Only valid if end has been set');
        if (this.endNameSet_) {
            return this.indexEndName_;
        }
        else {
            return MAX_NAME;
        }
    }
    /**
     * @return {boolean}
     */
    hasLimit() {
        return this.limitSet_;
    }
    /**
     * @return {boolean} True if a limit has been set and it has been explicitly anchored
     */
    hasAnchoredLimit() {
        return this.limitSet_ && this.viewFrom_ !== '';
    }
    /**
     * Only valid to call if hasLimit() returns true
     * @return {!number}
     */
    getLimit() {
        assert(this.limitSet_, 'Only valid if limit has been set');
        return this.limit_;
    }
    /**
     * @return {!Index}
     */
    getIndex() {
        return this.index_;
    }
    /**
     * @return {!QueryParams}
     * @private
     */
    copy_() {
        const copy = new QueryParams();
        copy.limitSet_ = this.limitSet_;
        copy.limit_ = this.limit_;
        copy.startSet_ = this.startSet_;
        copy.indexStartValue_ = this.indexStartValue_;
        copy.startNameSet_ = this.startNameSet_;
        copy.indexStartName_ = this.indexStartName_;
        copy.endSet_ = this.endSet_;
        copy.indexEndValue_ = this.indexEndValue_;
        copy.endNameSet_ = this.endNameSet_;
        copy.indexEndName_ = this.indexEndName_;
        copy.index_ = this.index_;
        copy.viewFrom_ = this.viewFrom_;
        return copy;
    }
    /**
     * @param {!number} newLimit
     * @return {!QueryParams}
     */
    limit(newLimit) {
        const newParams = this.copy_();
        newParams.limitSet_ = true;
        newParams.limit_ = newLimit;
        newParams.viewFrom_ = '';
        return newParams;
    }
    /**
     * @param {!number} newLimit
     * @return {!QueryParams}
     */
    limitToFirst(newLimit) {
        const newParams = this.copy_();
        newParams.limitSet_ = true;
        newParams.limit_ = newLimit;
        newParams.viewFrom_ = QueryParams.WIRE_PROTOCOL_CONSTANTS_.VIEW_FROM_LEFT;
        return newParams;
    }
    /**
     * @param {!number} newLimit
     * @return {!QueryParams}
     */
    limitToLast(newLimit) {
        const newParams = this.copy_();
        newParams.limitSet_ = true;
        newParams.limit_ = newLimit;
        newParams.viewFrom_ = QueryParams.WIRE_PROTOCOL_CONSTANTS_.VIEW_FROM_RIGHT;
        return newParams;
    }
    /**
     * @param {*} indexValue
     * @param {?string=} key
     * @return {!QueryParams}
     */
    startAt(indexValue, key) {
        const newParams = this.copy_();
        newParams.startSet_ = true;
        if (indexValue === undefined) {
            indexValue = null;
        }
        newParams.indexStartValue_ = indexValue;
        if (key != null) {
            newParams.startNameSet_ = true;
            newParams.indexStartName_ = key;
        }
        else {
            newParams.startNameSet_ = false;
            newParams.indexStartName_ = '';
        }
        return newParams;
    }
    /**
     * @param {*} indexValue
     * @param {?string=} key
     * @return {!QueryParams}
     */
    endAt(indexValue, key) {
        const newParams = this.copy_();
        newParams.endSet_ = true;
        if (indexValue === undefined) {
            indexValue = null;
        }
        newParams.indexEndValue_ = indexValue;
        if (key !== undefined) {
            newParams.endNameSet_ = true;
            newParams.indexEndName_ = key;
        }
        else {
            newParams.endNameSet_ = false;
            newParams.indexEndName_ = '';
        }
        return newParams;
    }
    /**
     * @param {!Index} index
     * @return {!QueryParams}
     */
    orderBy(index) {
        const newParams = this.copy_();
        newParams.index_ = index;
        return newParams;
    }
    /**
     * @return {!Object}
     */
    getQueryObject() {
        const WIRE_PROTOCOL_CONSTANTS = QueryParams.WIRE_PROTOCOL_CONSTANTS_;
        const obj = {};
        if (this.startSet_) {
            obj[WIRE_PROTOCOL_CONSTANTS.INDEX_START_VALUE] = this.indexStartValue_;
            if (this.startNameSet_) {
                obj[WIRE_PROTOCOL_CONSTANTS.INDEX_START_NAME] = this.indexStartName_;
            }
        }
        if (this.endSet_) {
            obj[WIRE_PROTOCOL_CONSTANTS.INDEX_END_VALUE] = this.indexEndValue_;
            if (this.endNameSet_) {
                obj[WIRE_PROTOCOL_CONSTANTS.INDEX_END_NAME] = this.indexEndName_;
            }
        }
        if (this.limitSet_) {
            obj[WIRE_PROTOCOL_CONSTANTS.LIMIT] = this.limit_;
            let viewFrom = this.viewFrom_;
            if (viewFrom === '') {
                if (this.isViewFromLeft()) {
                    viewFrom = WIRE_PROTOCOL_CONSTANTS.VIEW_FROM_LEFT;
                }
                else {
                    viewFrom = WIRE_PROTOCOL_CONSTANTS.VIEW_FROM_RIGHT;
                }
            }
            obj[WIRE_PROTOCOL_CONSTANTS.VIEW_FROM] = viewFrom;
        }
        // For now, priority index is the default, so we only specify if it's some other index
        if (this.index_ !== PRIORITY_INDEX) {
            obj[WIRE_PROTOCOL_CONSTANTS.INDEX] = this.index_.toString();
        }
        return obj;
    }
    /**
     * @return {boolean}
     */
    loadsAllData() {
        return !(this.startSet_ || this.endSet_ || this.limitSet_);
    }
    /**
     * @return {boolean}
     */
    isDefault() {
        return this.loadsAllData() && this.index_ == PRIORITY_INDEX;
    }
    /**
     * @return {!NodeFilter}
     */
    getNodeFilter() {
        if (this.loadsAllData()) {
            return new IndexedFilter(this.getIndex());
        }
        else if (this.hasLimit()) {
            return new LimitedFilter(this);
        }
        else {
            return new RangedFilter(this);
        }
    }
    /**
     * Returns a set of REST query string parameters representing this query.
     *
     * @return {!Object.<string,*>} query string parameters
     */
    toRestQueryStringParameters() {
        const REST_CONSTANTS = QueryParams.REST_QUERY_CONSTANTS_;
        const qs = {};
        if (this.isDefault()) {
            return qs;
        }
        let orderBy;
        if (this.index_ === PRIORITY_INDEX) {
            orderBy = REST_CONSTANTS.PRIORITY_INDEX;
        }
        else if (this.index_ === VALUE_INDEX) {
            orderBy = REST_CONSTANTS.VALUE_INDEX;
        }
        else if (this.index_ === KEY_INDEX) {
            orderBy = REST_CONSTANTS.KEY_INDEX;
        }
        else {
            assert(this.index_ instanceof PathIndex, 'Unrecognized index type!');
            orderBy = this.index_.toString();
        }
        qs[REST_CONSTANTS.ORDER_BY] = stringify(orderBy);
        if (this.startSet_) {
            qs[REST_CONSTANTS.START_AT] = stringify(this.indexStartValue_);
            if (this.startNameSet_) {
                qs[REST_CONSTANTS.START_AT] += ',' + stringify(this.indexStartName_);
            }
        }
        if (this.endSet_) {
            qs[REST_CONSTANTS.END_AT] = stringify(this.indexEndValue_);
            if (this.endNameSet_) {
                qs[REST_CONSTANTS.END_AT] += ',' + stringify(this.indexEndName_);
            }
        }
        if (this.limitSet_) {
            if (this.isViewFromLeft()) {
                qs[REST_CONSTANTS.LIMIT_TO_FIRST] = this.limit_;
            }
            else {
                qs[REST_CONSTANTS.LIMIT_TO_LAST] = this.limit_;
            }
        }
        return qs;
    }
}
/**
 * Wire Protocol Constants
 * @const
 * @enum {string}
 * @private
 */
QueryParams.WIRE_PROTOCOL_CONSTANTS_ = {
    INDEX_START_VALUE: 'sp',
    INDEX_START_NAME: 'sn',
    INDEX_END_VALUE: 'ep',
    INDEX_END_NAME: 'en',
    LIMIT: 'l',
    VIEW_FROM: 'vf',
    VIEW_FROM_LEFT: 'l',
    VIEW_FROM_RIGHT: 'r',
    INDEX: 'i'
};
/**
 * REST Query Constants
 * @const
 * @enum {string}
 * @private
 */
QueryParams.REST_QUERY_CONSTANTS_ = {
    ORDER_BY: 'orderBy',
    PRIORITY_INDEX: '$priority',
    VALUE_INDEX: '$value',
    KEY_INDEX: '$key',
    START_AT: 'startAt',
    END_AT: 'endAt',
    LIMIT_TO_FIRST: 'limitToFirst',
    LIMIT_TO_LAST: 'limitToLast'
};
/**
 * Default, empty query parameters
 * @type {!QueryParams}
 * @const
 */
QueryParams.DEFAULT = new QueryParams();

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
class Reference extends Query {
    /**
     * Call options:
     *   new Reference(Repo, Path) or
     *   new Reference(url: string, string|RepoManager)
     *
     * Externally - this is the firebase.database.Reference type.
     *
     * @param {!Repo} repo
     * @param {(!Path)} path
     * @extends {Query}
     */
    constructor(repo, path) {
        if (!(repo instanceof Repo)) {
            throw new Error('new Reference() no longer supported - use app.database().');
        }
        // call Query's constructor, passing in the repo and path.
        super(repo, path, QueryParams.DEFAULT, false);
    }
    /** @return {?string} */
    getKey() {
        validateArgCount('Reference.key', 0, 0, arguments.length);
        if (this.path.isEmpty())
            return null;
        else
            return this.path.getBack();
    }
    /**
     * @param {!(string|Path)} pathString
     * @return {!Reference}
     */
    child(pathString) {
        validateArgCount('Reference.child', 1, 1, arguments.length);
        if (typeof pathString === 'number') {
            pathString = String(pathString);
        }
        else if (!(pathString instanceof Path)) {
            if (this.path.getFront() === null)
                validateRootPathString('Reference.child', 1, pathString, false);
            else
                validatePathString('Reference.child', 1, pathString, false);
        }
        return new Reference(this.repo, this.path.child(pathString));
    }
    /** @return {?Reference} */
    getParent() {
        validateArgCount('Reference.parent', 0, 0, arguments.length);
        const parentPath = this.path.parent();
        return parentPath === null ? null : new Reference(this.repo, parentPath);
    }
    /** @return {!Reference} */
    getRoot() {
        validateArgCount('Reference.root', 0, 0, arguments.length);
        let ref = this;
        while (ref.getParent() !== null) {
            ref = ref.getParent();
        }
        return ref;
    }
    /** @return {!Database} */
    databaseProp() {
        return this.repo.database;
    }
    /**
     * @param {*} newVal
     * @param {function(?Error)=} onComplete
     * @return {!Promise}
     */
    set(newVal, onComplete) {
        validateArgCount('Reference.set', 1, 2, arguments.length);
        validateWritablePath('Reference.set', this.path);
        validateFirebaseDataArg('Reference.set', 1, newVal, this.path, false);
        validateCallback('Reference.set', 2, onComplete, true);
        const deferred = new Deferred();
        this.repo.setWithPriority(this.path, newVal, 
        /*priority=*/ null, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {!Object} objectToMerge
     * @param {function(?Error)=} onComplete
     * @return {!Promise}
     */
    update(objectToMerge, onComplete) {
        validateArgCount('Reference.update', 1, 2, arguments.length);
        validateWritablePath('Reference.update', this.path);
        if (Array.isArray(objectToMerge)) {
            const newObjectToMerge = {};
            for (let i = 0; i < objectToMerge.length; ++i) {
                newObjectToMerge['' + i] = objectToMerge[i];
            }
            objectToMerge = newObjectToMerge;
            warn('Passing an Array to Firebase.update() is deprecated. ' +
                'Use set() if you want to overwrite the existing data, or ' +
                'an Object with integer keys if you really do want to ' +
                'only update some of the children.');
        }
        validateFirebaseMergeDataArg('Reference.update', 1, objectToMerge, this.path, false);
        validateCallback('Reference.update', 2, onComplete, true);
        const deferred = new Deferred();
        this.repo.update(this.path, objectToMerge, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {*} newVal
     * @param {string|number|null} newPriority
     * @param {function(?Error)=} onComplete
     * @return {!Promise}
     */
    setWithPriority(newVal, newPriority, onComplete) {
        validateArgCount('Reference.setWithPriority', 2, 3, arguments.length);
        validateWritablePath('Reference.setWithPriority', this.path);
        validateFirebaseDataArg('Reference.setWithPriority', 1, newVal, this.path, false);
        validatePriority('Reference.setWithPriority', 2, newPriority, false);
        validateCallback('Reference.setWithPriority', 3, onComplete, true);
        if (this.getKey() === '.length' || this.getKey() === '.keys')
            throw 'Reference.setWithPriority failed: ' +
                this.getKey() +
                ' is a read-only object.';
        const deferred = new Deferred();
        this.repo.setWithPriority(this.path, newVal, newPriority, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {function(?Error)=} onComplete
     * @return {!Promise}
     */
    remove(onComplete) {
        validateArgCount('Reference.remove', 0, 1, arguments.length);
        validateWritablePath('Reference.remove', this.path);
        validateCallback('Reference.remove', 1, onComplete, true);
        return this.set(null, onComplete);
    }
    /**
     * @param {function(*):*} transactionUpdate
     * @param {(function(?Error, boolean, ?DataSnapshot))=} onComplete
     * @param {boolean=} applyLocally
     * @return {!Promise}
     */
    transaction(transactionUpdate, onComplete, applyLocally) {
        validateArgCount('Reference.transaction', 1, 3, arguments.length);
        validateWritablePath('Reference.transaction', this.path);
        validateCallback('Reference.transaction', 1, transactionUpdate, false);
        validateCallback('Reference.transaction', 2, onComplete, true);
        // NOTE: applyLocally is an internal-only option for now.  We need to decide if we want to keep it and how
        // to expose it.
        validateBoolean('Reference.transaction', 3, applyLocally, true);
        if (this.getKey() === '.length' || this.getKey() === '.keys')
            throw 'Reference.transaction failed: ' +
                this.getKey() +
                ' is a read-only object.';
        if (applyLocally === undefined)
            applyLocally = true;
        const deferred = new Deferred();
        if (typeof onComplete === 'function') {
            deferred.promise.catch(() => { });
        }
        const promiseComplete = function (error, committed, snapshot) {
            if (error) {
                deferred.reject(error);
            }
            else {
                deferred.resolve(new TransactionResult(committed, snapshot));
            }
            if (typeof onComplete === 'function') {
                onComplete(error, committed, snapshot);
            }
        };
        this.repo.startTransaction(this.path, transactionUpdate, promiseComplete, applyLocally);
        return deferred.promise;
    }
    /**
     * @param {string|number|null} priority
     * @param {function(?Error)=} onComplete
     * @return {!Promise}
     */
    setPriority(priority, onComplete) {
        validateArgCount('Reference.setPriority', 1, 2, arguments.length);
        validateWritablePath('Reference.setPriority', this.path);
        validatePriority('Reference.setPriority', 1, priority, false);
        validateCallback('Reference.setPriority', 2, onComplete, true);
        const deferred = new Deferred();
        this.repo.setWithPriority(this.path.child('.priority'), priority, null, deferred.wrapCallback(onComplete));
        return deferred.promise;
    }
    /**
     * @param {*=} value
     * @param {function(?Error)=} onComplete
     * @return {!Reference}
     */
    push(value, onComplete) {
        validateArgCount('Reference.push', 0, 2, arguments.length);
        validateWritablePath('Reference.push', this.path);
        validateFirebaseDataArg('Reference.push', 1, value, this.path, true);
        validateCallback('Reference.push', 2, onComplete, true);
        const now = this.repo.serverTime();
        const name = nextPushId(now);
        // push() returns a ThennableReference whose promise is fulfilled with a regular Reference.
        // We use child() to create handles to two different references. The first is turned into a
        // ThennableReference below by adding then() and catch() methods and is used as the
        // return value of push(). The second remains a regular Reference and is used as the fulfilled
        // value of the first ThennableReference.
        const thennablePushRef = this.child(name);
        const pushRef = this.child(name);
        let promise;
        if (value != null) {
            promise = thennablePushRef.set(value, onComplete).then(() => pushRef);
        }
        else {
            promise = Promise.resolve(pushRef);
        }
        thennablePushRef.then = promise.then.bind(promise);
        thennablePushRef.catch = promise.then.bind(promise, undefined);
        if (typeof onComplete === 'function') {
            promise.catch(() => { });
        }
        return thennablePushRef;
    }
    /**
     * @return {!OnDisconnect}
     */
    onDisconnect() {
        validateWritablePath('Reference.onDisconnect', this.path);
        return new OnDisconnect(this.repo, this.path);
    }
    get database() {
        return this.databaseProp();
    }
    get key() {
        return this.getKey();
    }
    get parent() {
        return this.getParent();
    }
    get root() {
        return this.getRoot();
    }
}
/**
 * Define reference constructor in various modules
 *
 * We are doing this here to avoid several circular
 * dependency issues
 */
Query.__referenceConstructor = Reference;
SyncPoint.__referenceConstructor = Reference;

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Node in a Tree.
 */
class TreeNode {
    constructor() {
        // TODO: Consider making accessors that create children and value lazily or
        // separate Internal / Leaf 'types'.
        this.children = {};
        this.childCount = 0;
        this.value = null;
    }
}
/**
 * A light-weight tree, traversable by path.  Nodes can have both values and children.
 * Nodes are not enumerated (by forEachChild) unless they have a value or non-empty
 * children.
 */
class Tree {
    /**
     * @template T
     * @param {string=} name_ Optional name of the node.
     * @param {Tree=} parent_ Optional parent node.
     * @param {TreeNode=} node_ Optional node to wrap.
     */
    constructor(name_ = '', parent_ = null, node_ = new TreeNode()) {
        this.name_ = name_;
        this.parent_ = parent_;
        this.node_ = node_;
    }
    /**
     * Returns a sub-Tree for the given path.
     *
     * @param {!(string|Path)} pathObj Path to look up.
     * @return {!Tree.<T>} Tree for path.
     */
    subTree(pathObj) {
        // TODO: Require pathObj to be Path?
        let path = pathObj instanceof Path ? pathObj : new Path(pathObj);
        let child = this, next;
        while ((next = path.getFront()) !== null) {
            const childNode = safeGet(child.node_.children, next) || new TreeNode();
            child = new Tree(next, child, childNode);
            path = path.popFront();
        }
        return child;
    }
    /**
     * Returns the data associated with this tree node.
     *
     * @return {?T} The data or null if no data exists.
     */
    getValue() {
        return this.node_.value;
    }
    /**
     * Sets data to this tree node.
     *
     * @param {!T} value Value to set.
     */
    setValue(value) {
        assert(typeof value !== 'undefined', 'Cannot set value to undefined');
        this.node_.value = value;
        this.updateParents_();
    }
    /**
     * Clears the contents of the tree node (its value and all children).
     */
    clear() {
        this.node_.value = null;
        this.node_.children = {};
        this.node_.childCount = 0;
        this.updateParents_();
    }
    /**
     * @return {boolean} Whether the tree has any children.
     */
    hasChildren() {
        return this.node_.childCount > 0;
    }
    /**
     * @return {boolean} Whether the tree is empty (no value or children).
     */
    isEmpty() {
        return this.getValue() === null && !this.hasChildren();
    }
    /**
     * Calls action for each child of this tree node.
     *
     * @param {function(!Tree.<T>)} action Action to be called for each child.
     */
    forEachChild(action) {
        forEach(this.node_.children, (child, childTree) => {
            action(new Tree(child, this, childTree));
        });
    }
    /**
     * Does a depth-first traversal of this node's descendants, calling action for each one.
     *
     * @param {function(!Tree.<T>)} action Action to be called for each child.
     * @param {boolean=} includeSelf Whether to call action on this node as well. Defaults to
     *   false.
     * @param {boolean=} childrenFirst Whether to call action on children before calling it on
     *   parent.
     */
    forEachDescendant(action, includeSelf, childrenFirst) {
        if (includeSelf && !childrenFirst)
            action(this);
        this.forEachChild(function (child) {
            child.forEachDescendant(action, /*includeSelf=*/ true, childrenFirst);
        });
        if (includeSelf && childrenFirst)
            action(this);
    }
    /**
     * Calls action on each ancestor node.
     *
     * @param {function(!Tree.<T>)} action Action to be called on each parent; return
     *   true to abort.
     * @param {boolean=} includeSelf Whether to call action on this node as well.
     * @return {boolean} true if the action callback returned true.
     */
    forEachAncestor(action, includeSelf) {
        let node = includeSelf ? this : this.parent();
        while (node !== null) {
            if (action(node)) {
                return true;
            }
            node = node.parent();
        }
        return false;
    }
    /**
     * Does a depth-first traversal of this node's descendants.  When a descendant with a value
     * is found, action is called on it and traversal does not continue inside the node.
     * Action is *not* called on this node.
     *
     * @param {function(!Tree.<T>)} action Action to be called for each child.
     */
    forEachImmediateDescendantWithValue(action) {
        this.forEachChild(function (child) {
            if (child.getValue() !== null)
                action(child);
            else
                child.forEachImmediateDescendantWithValue(action);
        });
    }
    /**
     * @return {!Path} The path of this tree node, as a Path.
     */
    path() {
        return new Path(this.parent_ === null
            ? this.name_
            : this.parent_.path() + '/' + this.name_);
    }
    /**
     * @return {string} The name of the tree node.
     */
    name() {
        return this.name_;
    }
    /**
     * @return {?Tree} The parent tree node, or null if this is the root of the tree.
     */
    parent() {
        return this.parent_;
    }
    /**
     * Adds or removes this child from its parent based on whether it's empty or not.
     *
     * @private
     */
    updateParents_() {
        if (this.parent_ !== null)
            this.parent_.updateChild_(this.name_, this);
    }
    /**
     * Adds or removes the passed child to this tree node, depending on whether it's empty.
     *
     * @param {string} childName The name of the child to update.
     * @param {!Tree.<T>} child The child to update.
     * @private
     */
    updateChild_(childName, child) {
        const childEmpty = child.isEmpty();
        const childExists = contains(this.node_.children, childName);
        if (childEmpty && childExists) {
            delete this.node_.children[childName];
            this.node_.childCount--;
            this.updateParents_();
        }
        else if (!childEmpty && !childExists) {
            this.node_.children[childName] = child.node_;
            this.node_.childCount++;
            this.updateParents_();
        }
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// TODO: This is pretty messy.  Ideally, a lot of this would move into FirebaseData, or a transaction-specific
// component used by FirebaseData, but it has ties to user callbacks (transaction update and onComplete) as well
// as the realtime connection (to send transactions to the server).  So that all needs to be decoupled first.
// For now it's part of Repo, but in its own file.
/**
 * @enum {number}
 */
var TransactionStatus;
(function (TransactionStatus) {
    // We've run the transaction and updated transactionResultData_ with the result, but it isn't currently sent to the
    // server. A transaction will go from RUN -> SENT -> RUN if it comes back from the server as rejected due to
    // mismatched hash.
    TransactionStatus[TransactionStatus["RUN"] = 0] = "RUN";
    // We've run the transaction and sent it to the server and it's currently outstanding (hasn't come back as accepted
    // or rejected yet).
    TransactionStatus[TransactionStatus["SENT"] = 1] = "SENT";
    // Temporary state used to mark completed transactions (whether successful or aborted).  The transaction will be
    // removed when we get a chance to prune completed ones.
    TransactionStatus[TransactionStatus["COMPLETED"] = 2] = "COMPLETED";
    // Used when an already-sent transaction needs to be aborted (e.g. due to a conflicting set() call that was made).
    // If it comes back as unsuccessful, we'll abort it.
    TransactionStatus[TransactionStatus["SENT_NEEDS_ABORT"] = 3] = "SENT_NEEDS_ABORT";
    // Temporary state used to mark transactions that need to be aborted.
    TransactionStatus[TransactionStatus["NEEDS_ABORT"] = 4] = "NEEDS_ABORT";
})(TransactionStatus || (TransactionStatus = {}));
/**
 * If a transaction does not succeed after 25 retries, we abort it.  Among other things this ensure that if there's
 * ever a bug causing a mismatch between client / server hashes for some data, we won't retry indefinitely.
 * @type {number}
 * @const
 * @private
 */
Repo.MAX_TRANSACTION_RETRIES_ = 25;
/**
 * Setup the transaction data structures
 * @private
 */
Repo.prototype.transactions_init_ = function () {
    /**
     * Stores queues of outstanding transactions for Firebase locations.
     *
     * @type {!Tree.<Array.<!Transaction>>}
     * @private
     */
    this.transactionQueueTree_ = new Tree();
};
/**
 * Creates a new transaction, adds it to the transactions we're tracking, and sends it to the server if possible.
 *
 * @param {!Path} path Path at which to do transaction.
 * @param {function(*):*} transactionUpdate Update callback.
 * @param {?function(?Error, boolean, ?DataSnapshot)} onComplete Completion callback.
 * @param {boolean} applyLocally Whether or not to make intermediate results visible
 */
Repo.prototype.startTransaction = function (path, transactionUpdate, onComplete, applyLocally) {
    this.log_('transaction on ' + path);
    // Add a watch to make sure we get server updates.
    const valueCallback = function () { };
    const watchRef = new Reference(this, path);
    watchRef.on('value', valueCallback);
    const unwatcher = function () {
        watchRef.off('value', valueCallback);
    };
    // Initialize transaction.
    const transaction = {
        path,
        update: transactionUpdate,
        onComplete,
        // One of TransactionStatus enums.
        status: null,
        // Used when combining transactions at different locations to figure out which one goes first.
        order: LUIDGenerator(),
        // Whether to raise local events for this transaction.
        applyLocally: applyLocally,
        // Count of how many times we've retried the transaction.
        retryCount: 0,
        // Function to call to clean up our .on() listener.
        unwatcher,
        // Stores why a transaction was aborted.
        abortReason: null,
        currentWriteId: null,
        currentInputSnapshot: null,
        currentOutputSnapshotRaw: null,
        currentOutputSnapshotResolved: null
    };
    // Run transaction initially.
    const currentState = this.getLatestState_(path);
    transaction.currentInputSnapshot = currentState;
    const newVal = transaction.update(currentState.val());
    if (newVal === undefined) {
        // Abort transaction.
        transaction.unwatcher();
        transaction.currentOutputSnapshotRaw = null;
        transaction.currentOutputSnapshotResolved = null;
        if (transaction.onComplete) {
            // We just set the input snapshot, so this cast should be safe
            const snapshot = new DataSnapshot(transaction.currentInputSnapshot, new Reference(this, transaction.path), PRIORITY_INDEX);
            transaction.onComplete(null, false, snapshot);
        }
    }
    else {
        validateFirebaseData('transaction failed: Data returned ', newVal, transaction.path);
        // Mark as run and add to our queue.
        transaction.status = TransactionStatus.RUN;
        const queueNode = this.transactionQueueTree_.subTree(path);
        const nodeQueue = queueNode.getValue() || [];
        nodeQueue.push(transaction);
        queueNode.setValue(nodeQueue);
        // Update visibleData and raise events
        // Note: We intentionally raise events after updating all of our transaction state, since the user could
        // start new transactions from the event callbacks.
        let priorityForNode;
        if (typeof newVal === 'object' &&
            newVal !== null &&
            contains(newVal, '.priority')) {
            priorityForNode = safeGet(newVal, '.priority');
            assert(isValidPriority(priorityForNode), 'Invalid priority returned by transaction. ' +
                'Priority must be a valid string, finite number, server value, or null.');
        }
        else {
            const currentNode = this.serverSyncTree_.calcCompleteEventCache(path) ||
                ChildrenNode.EMPTY_NODE;
            priorityForNode = currentNode.getPriority().val();
        }
        priorityForNode /** @type {null|number|string} */ = priorityForNode;
        const serverValues = this.generateServerValues();
        const newNodeUnresolved = nodeFromJSON$1(newVal, priorityForNode);
        const newNode = resolveDeferredValueSnapshot(newNodeUnresolved, serverValues);
        transaction.currentOutputSnapshotRaw = newNodeUnresolved;
        transaction.currentOutputSnapshotResolved = newNode;
        transaction.currentWriteId = this.getNextWriteId_();
        const events = this.serverSyncTree_.applyUserOverwrite(path, newNode, transaction.currentWriteId, transaction.applyLocally);
        this.eventQueue_.raiseEventsForChangedPath(path, events);
        this.sendReadyTransactions_();
    }
};
/**
 * @param {!Path} path
 * @param {Array.<number>=} excludeSets A specific set to exclude
 * @return {Node}
 * @private
 */
Repo.prototype.getLatestState_ = function (path, excludeSets) {
    return (this.serverSyncTree_.calcCompleteEventCache(path, excludeSets) ||
        ChildrenNode.EMPTY_NODE);
};
/**
 * Sends any already-run transactions that aren't waiting for outstanding transactions to
 * complete.
 *
 * Externally it's called with no arguments, but it calls itself recursively with a particular
 * transactionQueueTree node to recurse through the tree.
 *
 * @param {Tree.<Array.<Transaction>>=} node  transactionQueueTree node to start at.
 * @private
 */
Repo.prototype.sendReadyTransactions_ = function (node = this.transactionQueueTree_) {
    // Before recursing, make sure any completed transactions are removed.
    if (!node) {
        this.pruneCompletedTransactionsBelowNode_(node);
    }
    if (node.getValue() !== null) {
        const queue = this.buildTransactionQueue_(node);
        assert(queue.length > 0, 'Sending zero length transaction queue');
        const allRun = queue.every((transaction) => transaction.status === TransactionStatus.RUN);
        // If they're all run (and not sent), we can send them.  Else, we must wait.
        if (allRun) {
            this.sendTransactionQueue_(node.path(), queue);
        }
    }
    else if (node.hasChildren()) {
        node.forEachChild(childNode => {
            this.sendReadyTransactions_(childNode);
        });
    }
};
/**
 * Given a list of run transactions, send them to the server and then handle the result (success or failure).
 *
 * @param {!Path} path The location of the queue.
 * @param {!Array.<Transaction>} queue Queue of transactions under the specified location.
 * @private
 */
Repo.prototype.sendTransactionQueue_ = function (path, queue) {
    // Mark transactions as sent and increment retry count!
    const setsToIgnore = queue.map(function (txn) {
        return txn.currentWriteId;
    });
    const latestState = this.getLatestState_(path, setsToIgnore);
    let snapToSend = latestState;
    const latestHash = latestState.hash();
    for (let i = 0; i < queue.length; i++) {
        const txn = queue[i];
        assert(txn.status === TransactionStatus.RUN, 'tryToSendTransactionQueue_: items in queue should all be run.');
        txn.status = TransactionStatus.SENT;
        txn.retryCount++;
        const relativePath = Path.relativePath(path, txn.path);
        // If we've gotten to this point, the output snapshot must be defined.
        snapToSend = snapToSend.updateChild(relativePath /**@type {!Node} */, txn.currentOutputSnapshotRaw);
    }
    const dataToSend = snapToSend.val(true);
    const pathToSend = path;
    // Send the put.
    this.server_.put(pathToSend.toString(), dataToSend, (status) => {
        this.log_('transaction put response', {
            path: pathToSend.toString(),
            status
        });
        let events = [];
        if (status === 'ok') {
            // Queue up the callbacks and fire them after cleaning up all of our transaction state, since
            // the callback could trigger more transactions or sets.
            const callbacks = [];
            for (let i = 0; i < queue.length; i++) {
                queue[i].status = TransactionStatus.COMPLETED;
                events = events.concat(this.serverSyncTree_.ackUserWrite(queue[i].currentWriteId));
                if (queue[i].onComplete) {
                    // We never unset the output snapshot, and given that this transaction is complete, it should be set
                    const node = queue[i].currentOutputSnapshotResolved;
                    const ref = new Reference(this, queue[i].path);
                    const snapshot = new DataSnapshot(node, ref, PRIORITY_INDEX);
                    callbacks.push(queue[i].onComplete.bind(null, null, true, snapshot));
                }
                queue[i].unwatcher();
            }
            // Now remove the completed transactions.
            this.pruneCompletedTransactionsBelowNode_(this.transactionQueueTree_.subTree(path));
            // There may be pending transactions that we can now send.
            this.sendReadyTransactions_();
            this.eventQueue_.raiseEventsForChangedPath(path, events);
            // Finally, trigger onComplete callbacks.
            for (let i = 0; i < callbacks.length; i++) {
                exceptionGuard(callbacks[i]);
            }
        }
        else {
            // transactions are no longer sent.  Update their status appropriately.
            if (status === 'datastale') {
                for (let i = 0; i < queue.length; i++) {
                    if (queue[i].status === TransactionStatus.SENT_NEEDS_ABORT)
                        queue[i].status = TransactionStatus.NEEDS_ABORT;
                    else
                        queue[i].status = TransactionStatus.RUN;
                }
            }
            else {
                warn('transaction at ' + pathToSend.toString() + ' failed: ' + status);
                for (let i = 0; i < queue.length; i++) {
                    queue[i].status = TransactionStatus.NEEDS_ABORT;
                    queue[i].abortReason = status;
                }
            }
            this.rerunTransactions_(path);
        }
    }, latestHash);
};
/**
 * Finds all transactions dependent on the data at changedPath and reruns them.
 *
 * Should be called any time cached data changes.
 *
 * Return the highest path that was affected by rerunning transactions.  This is the path at which events need to
 * be raised for.
 *
 * @param {!Path} changedPath The path in mergedData that changed.
 * @return {!Path} The rootmost path that was affected by rerunning transactions.
 * @private
 */
Repo.prototype.rerunTransactions_ = function (changedPath) {
    const rootMostTransactionNode = this.getAncestorTransactionNode_(changedPath);
    const path = rootMostTransactionNode.path();
    const queue = this.buildTransactionQueue_(rootMostTransactionNode);
    this.rerunTransactionQueue_(queue, path);
    return path;
};
/**
 * Does all the work of rerunning transactions (as well as cleans up aborted transactions and whatnot).
 *
 * @param {Array.<Transaction>} queue The queue of transactions to run.
 * @param {!Path} path The path the queue is for.
 * @private
 */
Repo.prototype.rerunTransactionQueue_ = function (queue, path) {
    if (queue.length === 0) {
        return; // Nothing to do!
    }
    // Queue up the callbacks and fire them after cleaning up all of our transaction state, since
    // the callback could trigger more transactions or sets.
    const callbacks = [];
    let events = [];
    // Ignore all of the sets we're going to re-run.
    const txnsToRerun = queue.filter(function (q) {
        return q.status === TransactionStatus.RUN;
    });
    const setsToIgnore = txnsToRerun.map(function (q) {
        return q.currentWriteId;
    });
    for (let i = 0; i < queue.length; i++) {
        const transaction = queue[i];
        const relativePath = Path.relativePath(path, transaction.path);
        let abortTransaction = false, abortReason;
        assert(relativePath !== null, 'rerunTransactionsUnderNode_: relativePath should not be null.');
        if (transaction.status === TransactionStatus.NEEDS_ABORT) {
            abortTransaction = true;
            abortReason = transaction.abortReason;
            events = events.concat(this.serverSyncTree_.ackUserWrite(transaction.currentWriteId, true));
        }
        else if (transaction.status === TransactionStatus.RUN) {
            if (transaction.retryCount >= Repo.MAX_TRANSACTION_RETRIES_) {
                abortTransaction = true;
                abortReason = 'maxretry';
                events = events.concat(this.serverSyncTree_.ackUserWrite(transaction.currentWriteId, true));
            }
            else {
                // This code reruns a transaction
                const currentNode = this.getLatestState_(transaction.path, setsToIgnore);
                transaction.currentInputSnapshot = currentNode;
                const newData = queue[i].update(currentNode.val());
                if (newData !== undefined) {
                    validateFirebaseData('transaction failed: Data returned ', newData, transaction.path);
                    let newDataNode = nodeFromJSON$1(newData);
                    const hasExplicitPriority = typeof newData === 'object' &&
                        newData != null &&
                        contains(newData, '.priority');
                    if (!hasExplicitPriority) {
                        // Keep the old priority if there wasn't a priority explicitly specified.
                        newDataNode = newDataNode.updatePriority(currentNode.getPriority());
                    }
                    const oldWriteId = transaction.currentWriteId;
                    const serverValues = this.generateServerValues();
                    const newNodeResolved = resolveDeferredValueSnapshot(newDataNode, serverValues);
                    transaction.currentOutputSnapshotRaw = newDataNode;
                    transaction.currentOutputSnapshotResolved = newNodeResolved;
                    transaction.currentWriteId = this.getNextWriteId_();
                    // Mutates setsToIgnore in place
                    setsToIgnore.splice(setsToIgnore.indexOf(oldWriteId), 1);
                    events = events.concat(this.serverSyncTree_.applyUserOverwrite(transaction.path, newNodeResolved, transaction.currentWriteId, transaction.applyLocally));
                    events = events.concat(this.serverSyncTree_.ackUserWrite(oldWriteId, true));
                }
                else {
                    abortTransaction = true;
                    abortReason = 'nodata';
                    events = events.concat(this.serverSyncTree_.ackUserWrite(transaction.currentWriteId, true));
                }
            }
        }
        this.eventQueue_.raiseEventsForChangedPath(path, events);
        events = [];
        if (abortTransaction) {
            // Abort.
            queue[i].status = TransactionStatus.COMPLETED;
            // Removing a listener can trigger pruning which can muck with mergedData/visibleData (as it prunes data).
            // So defer the unwatcher until we're done.
            (function (unwatcher) {
                setTimeout(unwatcher, Math.floor(0));
            })(queue[i].unwatcher);
            if (queue[i].onComplete) {
                if (abortReason === 'nodata') {
                    const ref = new Reference(this, queue[i].path);
                    // We set this field immediately, so it's safe to cast to an actual snapshot
                    const lastInput /** @type {!Node} */ = queue[i].currentInputSnapshot;
                    const snapshot = new DataSnapshot(lastInput, ref, PRIORITY_INDEX);
                    callbacks.push(queue[i].onComplete.bind(null, null, false, snapshot));
                }
                else {
                    callbacks.push(queue[i].onComplete.bind(null, new Error(abortReason), false, null));
                }
            }
        }
    }
    // Clean up completed transactions.
    this.pruneCompletedTransactionsBelowNode_(this.transactionQueueTree_);
    // Now fire callbacks, now that we're in a good, known state.
    for (let i = 0; i < callbacks.length; i++) {
        exceptionGuard(callbacks[i]);
    }
    // Try to send the transaction result to the server.
    this.sendReadyTransactions_();
};
/**
 * Returns the rootmost ancestor node of the specified path that has a pending transaction on it, or just returns
 * the node for the given path if there are no pending transactions on any ancestor.
 *
 * @param {!Path} path The location to start at.
 * @return {!Tree.<Array.<!Transaction>>} The rootmost node with a transaction.
 * @private
 */
Repo.prototype.getAncestorTransactionNode_ = function (path) {
    let front;
    // Start at the root and walk deeper into the tree towards path until we find a node with pending transactions.
    let transactionNode = this.transactionQueueTree_;
    while ((front = path.getFront()) !== null &&
        transactionNode.getValue() === null) {
        transactionNode = transactionNode.subTree(front);
        path = path.popFront();
    }
    return transactionNode;
};
/**
 * Builds the queue of all transactions at or below the specified transactionNode.
 *
 * @param {!Tree.<Array.<Transaction>>} transactionNode
 * @return {Array.<Transaction>} The generated queue.
 * @private
 */
Repo.prototype.buildTransactionQueue_ = function (transactionNode) {
    // Walk any child transaction queues and aggregate them into a single queue.
    const transactionQueue = [];
    this.aggregateTransactionQueuesForNode_(transactionNode, transactionQueue);
    // Sort them by the order the transactions were created.
    transactionQueue.sort(function (a, b) {
        return a.order - b.order;
    });
    return transactionQueue;
};
/**
 * @param {!Tree.<Array.<Transaction>>} node
 * @param {Array.<Transaction>} queue
 * @private
 */
Repo.prototype.aggregateTransactionQueuesForNode_ = function (node, queue) {
    const nodeQueue = node.getValue();
    if (nodeQueue !== null) {
        for (let i = 0; i < nodeQueue.length; i++) {
            queue.push(nodeQueue[i]);
        }
    }
    node.forEachChild(child => {
        this.aggregateTransactionQueuesForNode_(child, queue);
    });
};
/**
 * Remove COMPLETED transactions at or below this node in the transactionQueueTree_.
 *
 * @param {!Tree.<Array.<!Transaction>>} node
 * @private
 */
Repo.prototype.pruneCompletedTransactionsBelowNode_ = function (node) {
    const queue = node.getValue();
    if (queue) {
        let to = 0;
        for (let from = 0; from < queue.length; from++) {
            if (queue[from].status !== TransactionStatus.COMPLETED) {
                queue[to] = queue[from];
                to++;
            }
        }
        queue.length = to;
        node.setValue(queue.length > 0 ? queue : null);
    }
    node.forEachChild(childNode => {
        this.pruneCompletedTransactionsBelowNode_(childNode);
    });
};
/**
 * Aborts all transactions on ancestors or descendants of the specified path.  Called when doing a set() or update()
 * since we consider them incompatible with transactions.
 *
 * @param {!Path} path Path for which we want to abort related transactions.
 * @return {!Path}
 * @private
 */
Repo.prototype.abortTransactions_ = function (path) {
    const affectedPath = this.getAncestorTransactionNode_(path).path();
    const transactionNode = this.transactionQueueTree_.subTree(path);
    transactionNode.forEachAncestor((node) => {
        this.abortTransactionsOnNode_(node);
    });
    this.abortTransactionsOnNode_(transactionNode);
    transactionNode.forEachDescendant((node) => {
        this.abortTransactionsOnNode_(node);
    });
    return affectedPath;
};
/**
 * Abort transactions stored in this transaction queue node.
 *
 * @param {!Tree.<Array.<Transaction>>} node Node to abort transactions for.
 * @private
 */
Repo.prototype.abortTransactionsOnNode_ = function (node) {
    const queue = node.getValue();
    if (queue !== null) {
        // Queue up the callbacks and fire them after cleaning up all of our transaction state, since
        // the callback could trigger more transactions or sets.
        const callbacks = [];
        // Go through queue.  Any already-sent transactions must be marked for abort, while the unsent ones
        // can be immediately aborted and removed.
        let events = [];
        let lastSent = -1;
        for (let i = 0; i < queue.length; i++) {
            if (queue[i].status === TransactionStatus.SENT_NEEDS_ABORT) ;
            else if (queue[i].status === TransactionStatus.SENT) {
                assert(lastSent === i - 1, 'All SENT items should be at beginning of queue.');
                lastSent = i;
                // Mark transaction for abort when it comes back.
                queue[i].status = TransactionStatus.SENT_NEEDS_ABORT;
                queue[i].abortReason = 'set';
            }
            else {
                assert(queue[i].status === TransactionStatus.RUN, 'Unexpected transaction status in abort');
                // We can abort it immediately.
                queue[i].unwatcher();
                events = events.concat(this.serverSyncTree_.ackUserWrite(queue[i].currentWriteId, true));
                if (queue[i].onComplete) {
                    const snapshot = null;
                    callbacks.push(queue[i].onComplete.bind(null, new Error('set'), false, snapshot));
                }
            }
        }
        if (lastSent === -1) {
            // We're not waiting for any sent transactions.  We can clear the queue.
            node.setValue(null);
        }
        else {
            // Remove the transactions we aborted.
            queue.length = lastSent + 1;
        }
        // Now fire the callbacks.
        this.eventQueue_.raiseEventsForChangedPath(node.path(), events);
        for (let i = 0; i < callbacks.length; i++) {
            exceptionGuard(callbacks[i]);
        }
    }
};

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/** @const {string} */
const DATABASE_URL_OPTION = 'databaseURL';
let _staticInstance;
/**
 * Creates and caches Repo instances.
 */
class RepoManager {
    constructor() {
        /**
         * @private {!Object.<string, Object<string, !fb.core.Repo>>}
         */
        this.repos_ = {};
        /**
         * If true, new Repos will be created to use ReadonlyRestClient (for testing purposes).
         * @private {boolean}
         */
        this.useRestClient_ = false;
    }
    static getInstance() {
        if (!_staticInstance) {
            _staticInstance = new RepoManager();
        }
        return _staticInstance;
    }
    // TODO(koss): Remove these functions unless used in tests?
    interrupt() {
        for (const appName in this.repos_) {
            for (const dbUrl in this.repos_[appName]) {
                this.repos_[appName][dbUrl].interrupt();
            }
        }
    }
    resume() {
        for (const appName in this.repos_) {
            for (const dbUrl in this.repos_[appName]) {
                this.repos_[appName][dbUrl].resume();
            }
        }
    }
    /**
     * This function should only ever be called to CREATE a new database instance.
     *
     * @param {!FirebaseApp} app
     * @return {!Database}
     */
    databaseFromApp(app, url) {
        const dbUrl = url || app.options[DATABASE_URL_OPTION];
        if (dbUrl === undefined) {
            fatal("Can't determine Firebase Database URL.  Be sure to include " +
                DATABASE_URL_OPTION +
                ' option when calling firebase.initializeApp().');
        }
        const parsedUrl = parseRepoInfo(dbUrl);
        const repoInfo = parsedUrl.repoInfo;
        validateUrl('Invalid Firebase Database URL', 1, parsedUrl);
        if (!parsedUrl.path.isEmpty()) {
            fatal('Database URL must point to the root of a Firebase Database ' +
                '(not including a child path).');
        }
        const repo = this.createRepo(repoInfo, app);
        return repo.database;
    }
    /**
     * Remove the repo and make sure it is disconnected.
     *
     * @param {!Repo} repo
     */
    deleteRepo(repo) {
        const appRepos = safeGet(this.repos_, repo.app.name);
        // This should never happen...
        if (!appRepos || safeGet(appRepos, repo.repoInfo_.toURLString()) !== repo) {
            fatal(`Database ${repo.app.name}(${repo.repoInfo_}) has already been deleted.`);
        }
        repo.interrupt();
        delete appRepos[repo.repoInfo_.toURLString()];
    }
    /**
     * Ensures a repo doesn't already exist and then creates one using the
     * provided app.
     *
     * @param {!RepoInfo} repoInfo The metadata about the Repo
     * @param {!FirebaseApp} app
     * @return {!Repo} The Repo object for the specified server / repoName.
     */
    createRepo(repoInfo, app) {
        let appRepos = safeGet(this.repos_, app.name);
        if (!appRepos) {
            appRepos = {};
            this.repos_[app.name] = appRepos;
        }
        let repo = safeGet(appRepos, repoInfo.toURLString());
        if (repo) {
            fatal('Database initialized multiple times. Please make sure the format of the database URL matches with each database() call.');
        }
        repo = new Repo(repoInfo, this.useRestClient_, app);
        appRepos[repoInfo.toURLString()] = repo;
        return repo;
    }
    /**
     * Forces us to use ReadonlyRestClient instead of PersistentConnection for new Repos.
     * @param {boolean} forceRestClient
     */
    forceRestClient(forceRestClient) {
        this.useRestClient_ = forceRestClient;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * Class representing a firebase database.
 * @implements {FirebaseService}
 */
class Database {
    /**
     * The constructor should not be called by users of our public API.
     * @param {!Repo} repo_
     */
    constructor(repo_) {
        this.repo_ = repo_;
        if (!(repo_ instanceof Repo)) {
            fatal("Don't call new Database() directly - please use firebase.database().");
        }
        /** @type {Reference} */
        this.root_ = new Reference(repo_, Path.Empty);
        this.INTERNAL = new DatabaseInternals(this);
    }
    get app() {
        return this.repo_.app;
    }
    ref(path) {
        this.checkDeleted_('ref');
        validateArgCount('database.ref', 0, 1, arguments.length);
        if (path instanceof Reference) {
            return this.refFromURL(path.toString());
        }
        return path !== undefined ? this.root_.child(path) : this.root_;
    }
    /**
     * Returns a reference to the root or the path specified in url.
     * We throw a exception if the url is not in the same domain as the
     * current repo.
     * @param {string} url
     * @return {!Reference} Firebase reference.
     */
    refFromURL(url) {
        /** @const {string} */
        const apiName = 'database.refFromURL';
        this.checkDeleted_(apiName);
        validateArgCount(apiName, 1, 1, arguments.length);
        const parsedURL = parseRepoInfo(url);
        validateUrl(apiName, 1, parsedURL);
        const repoInfo = parsedURL.repoInfo;
        if (repoInfo.host !== this.repo_.repoInfo_.host) {
            fatal(apiName +
                ': Host name does not match the current database: ' +
                '(found ' +
                repoInfo.host +
                ' but expected ' +
                this.repo_.repoInfo_.host +
                ')');
        }
        return this.ref(parsedURL.path.toString());
    }
    /**
     * @param {string} apiName
     */
    checkDeleted_(apiName) {
        if (this.repo_ === null) {
            fatal('Cannot call ' + apiName + ' on a deleted database.');
        }
    }
    // Make individual repo go offline.
    goOffline() {
        validateArgCount('database.goOffline', 0, 0, arguments.length);
        this.checkDeleted_('goOffline');
        this.repo_.interrupt();
    }
    goOnline() {
        validateArgCount('database.goOnline', 0, 0, arguments.length);
        this.checkDeleted_('goOnline');
        this.repo_.resume();
    }
}
Database.ServerValue = {
    TIMESTAMP: {
        '.sv': 'timestamp'
    }
};
class DatabaseInternals {
    /** @param {!Database} database */
    constructor(database) {
        this.database = database;
    }
    /** @return {Promise<void>} */
    async delete() {
        this.database.checkDeleted_('delete');
        RepoManager.getInstance().deleteRepo(this.database.repo_);
        this.database.repo_ = null;
        this.database.root_ = null;
        this.database.INTERNAL = null;
        this.database = null;
    }
}

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * INTERNAL methods for internal-use only (tests, etc.).
 *
 * Customers shouldn't use these or else should be aware that they could break at any time.
 *
 * @const
 */
const forceLongPolling = function () {
    WebSocketConnection.forceDisallow();
    BrowserPollConnection.forceAllow();
};
const forceWebSockets = function () {
    BrowserPollConnection.forceDisallow();
};
/* Used by App Manager */
const isWebSocketsAvailable = function () {
    return WebSocketConnection['isAvailable']();
};
const setSecurityDebugCallback = function (ref, callback) {
    ref.repo.persistentConnection_.securityDebugCallback_ = callback;
};
const stats = function (ref, showDelta) {
    ref.repo.stats(showDelta);
};
const statsIncrementCounter = function (ref, metric) {
    ref.repo.statsIncrementCounter(metric);
};
const dataUpdateCount = function (ref) {
    return ref.repo.dataUpdateCount;
};
const interceptServerData = function (ref, callback) {
    return ref.repo.interceptServerData_(callback);
};

var INTERNAL = /*#__PURE__*/Object.freeze({
  forceLongPolling: forceLongPolling,
  forceWebSockets: forceWebSockets,
  isWebSocketsAvailable: isWebSocketsAvailable,
  setSecurityDebugCallback: setSecurityDebugCallback,
  stats: stats,
  statsIncrementCounter: statsIncrementCounter,
  dataUpdateCount: dataUpdateCount,
  interceptServerData: interceptServerData
});

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const DataConnection = PersistentConnection;
/**
 * @param {!string} pathString
 * @param {function(*)} onComplete
 */
PersistentConnection.prototype.simpleListen = function (pathString, onComplete) {
    this.sendRequest('q', { p: pathString }, onComplete);
};
/**
 * @param {*} data
 * @param {function(*)} onEcho
 */
PersistentConnection.prototype.echo = function (data, onEcho) {
    this.sendRequest('echo', { d: data }, onEcho);
};
// RealTimeConnection properties that we use in tests.
const RealTimeConnection = Connection;
/**
 * @param {function(): string} newHash
 * @return {function()}
 */
const hijackHash = function (newHash) {
    const oldPut = PersistentConnection.prototype.put;
    PersistentConnection.prototype.put = function (pathString, data, opt_onComplete, opt_hash) {
        if (opt_hash !== undefined) {
            opt_hash = newHash();
        }
        oldPut.call(this, pathString, data, opt_onComplete, opt_hash);
    };
    return function () {
        PersistentConnection.prototype.put = oldPut;
    };
};
/**
 * @type {function(new:RepoInfo, !string, boolean, !string, boolean): undefined}
 */
const ConnectionTarget = RepoInfo;
/**
 * @param {!Query} query
 * @return {!string}
 */
const queryIdentifier = function (query) {
    return query.queryIdentifier();
};
/**
 * @param {!Query} firebaseRef
 * @return {!Object}
 */
const listens = function (firebaseRef) {
    return firebaseRef.repo.persistentConnection_.listens_;
};
/**
 * Forces the RepoManager to create Repos that use ReadonlyRestClient instead of PersistentConnection.
 *
 * @param {boolean} forceRestClient
 */
const forceRestClient = function (forceRestClient) {
    RepoManager.getInstance().forceRestClient(forceRestClient);
};

var TEST_ACCESS = /*#__PURE__*/Object.freeze({
  DataConnection: DataConnection,
  RealTimeConnection: RealTimeConnection,
  hijackHash: hijackHash,
  ConnectionTarget: ConnectionTarget,
  queryIdentifier: queryIdentifier,
  listens: listens,
  forceRestClient: forceRestClient
});

/**
 * @license
 * Copyright 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const ServerValue = Database.ServerValue;
function registerDatabase(instance) {
    // Register the Database Service with the 'firebase' namespace.
    const namespace = instance.INTERNAL.registerService('database', (app, unused, url) => RepoManager.getInstance().databaseFromApp(app, url), 
    // firebase.database namespace properties
    {
        Reference,
        Query,
        Database,
        DataSnapshot,
        enableLogging,
        INTERNAL,
        ServerValue,
        TEST_ACCESS
    }, null, true);
    if (isNodeSdk()) {
        module.exports = namespace;
    }
}
registerDatabase(firebase);

export { DataSnapshot, Database, OnDisconnect, Query, Reference, ServerValue, enableLogging, registerDatabase };
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