# All files / helpers idb-manager.ts

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     /**
     * @license
     * Copyright 2019 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.
     */

    import { DB, openDb } from 'idb';
    import { AppConfig } from '../interfaces/app-config';

    const DATABASE_NAME = 'firebase-installations-database';
    const DATABASE_VERSION = 1;
    const OBJECT_STORE_NAME = 'firebase-installations-store';

    const dbPromise: Promise<DB> = openDb(
      DATABASE_NAME,
      DATABASE_VERSION,
      upgradeDB => {
        // We don't use 'break' in this switch statement, the fall-through
        // behavior is what we want, because if there are multiple versions between
        // the old version and the current version, we want ALL the migrations
        // that correspond to those versions to run, not only the last one.
        switch (upgradeDB.oldVersion) {
          case 0:
            upgradeDB.createObjectStore(OBJECT_STORE_NAME);
        }
      }
    );

    /** Gets record(s) from the objectStore that match the given key. */
    export async function get<ReturnType>(
      appConfig: AppConfig
    ): Promise<ReturnType | undefined> {
      const key = getKey(appConfig);
      const db = await dbPromise;
      return db
        .transaction(OBJECT_STORE_NAME)
        .objectStore(OBJECT_STORE_NAME)
        .get(key);
    }

    /** Assigns or overwrites the record for the given key with the given value. */
    export async function set<ValueType>(
      appConfig: AppConfig,
      value: ValueType
    ): Promise<ValueType> {
      const key = getKey(appConfig);
      const db = await dbPromise;
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      tx.objectStore(OBJECT_STORE_NAME).put(value, key);
      await tx.complete;
      return value;
    }

    /** Removes record(s) from the objectStore that match the given key. */
    export async function remove(appConfig: AppConfig): Promise<void> {
      const key = getKey(appConfig);
      const db = await dbPromise;
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      tx.objectStore(OBJECT_STORE_NAME).delete(key);
      return tx.complete;
    }

    /**
     * Atomically updates a record with the result of updateFn, which gets
     * called with the current value. If newValue is undefined, the record is
     * deleted instead.
     * @return Updated value
     */
    export async function update<OldType, NewType>(
      appConfig: AppConfig,
      updateFn: (previousValue: OldType | undefined) => NewType
    ): Promise<NewType> {
      const key = getKey(appConfig);
      const db = await dbPromise;
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      const store = tx.objectStore(OBJECT_STORE_NAME);
      const oldValue = await store.get(key);
      const newValue = updateFn(oldValue);

      if (newValue === oldValue) {
        return newValue;
      }

      if (newValue === undefined) {
        store.delete(key);
      } else {
        store.put(newValue, key);
      }

      await tx.complete;
      return newValue;
    }

    export async function clear(): Promise<void> {
      const db = await dbPromise;
      const tx = db.transaction(OBJECT_STORE_NAME, 'readwrite');
      tx.objectStore(OBJECT_STORE_NAME).clear();
      return tx.complete;
    }

    function getKey(appConfig: AppConfig): string {
      return `${appConfig.appName}!${appConfig.appId}`;
    }