/* This file is part of the Notesnook project (https://notesnook.com/)
 *
 * Copyright (C) 2022 Streetwriters (Private) Limited
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import { checkIsUserPremium, CHECK_IDS, EVENTS } from "../../common";
import { logger } from "../../logger";

export class AutoSync {
  /**
   *
   * @param {import("../index").default} db
   * @param {number} interval
   */
  constructor(db, interval) {
    this.db = db;
    this.interval = interval;
    this.timeout = null;
    this.isAutoSyncing = false;
    this.logger = logger.scope("AutoSync");
  }

  async start() {
    this.logger.info(`Auto sync requested`);

    if (!(await checkIsUserPremium(CHECK_IDS.databaseSync))) return;
    if (this.isAutoSyncing) return;

    this.isAutoSyncing = true;
    this.databaseUpdatedEvent = this.db.eventManager.subscribeSingle(
      EVENTS.databaseUpdated,
      this.schedule.bind(this)
    );

    this.logger.info(`Auto sync started`);
  }

  stop() {
    this.isAutoSyncing = false;
    clearTimeout(this.timeout);
    if (this.databaseUpdatedEvent) this.databaseUpdatedEvent.unsubscribe();

    this.logger.info(`Auto sync stopped`);
  }

  /**
   * @private
   */
  schedule(id, item) {
    if (item && (item.remote || item.localOnly || item.failed)) return;

    clearTimeout(this.timeout);
    this.timeout = setTimeout(() => {
      this.logger.info(`Sync requested by: ${id}`);
      this.db.eventManager.publish(EVENTS.databaseSyncRequested, false, false);
    }, this.interval);
  }
}