/*
 * Copyright (c) 2015-present, Parse, LLC.
 * All rights reserved.
 *
 * This source code is licensed under the BSD-style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *
 */
import EventEmitter from './EventEmitter';
import CoreManager from './CoreManager';
/**
 * Creates a new LiveQuery Subscription.
 * Extends events.EventEmitter
 * <a href="https://nodejs.org/api/events.html#events_class_eventemitter">cloud functions</a>.
 *
 *
 * <p>Open Event - When you call query.subscribe(), we send a subscribe request to
 * the LiveQuery server, when we get the confirmation from the LiveQuery server,
 * this event will be emitted. When the client loses WebSocket connection to the
 * LiveQuery server, we will try to auto reconnect the LiveQuery server. If we
 * reconnect the LiveQuery server and successfully resubscribe the ParseQuery,
 * you'll also get this event.
 *
 * <pre>
 * subscription.on('open', () => {
 *
 * });</pre></p>
 *
 * <p>Create Event - When a new ParseObject is created and it fulfills the ParseQuery you subscribe,
 * you'll get this event. The object is the ParseObject which is created.
 *
 * <pre>
 * subscription.on('create', (object) => {
 *
 * });</pre></p>
 *
 * <p>Update Event - When an existing ParseObject (original) which fulfills the ParseQuery you subscribe
 * is updated (The ParseObject fulfills the ParseQuery before and after changes),
 * you'll get this event. The object is the ParseObject which is updated.
 * Its content is the latest value of the ParseObject.
 *
 * Parse-Server 3.1.3+ Required for original object parameter
 *
 * <pre>
 * subscription.on('update', (object, original) => {
 *
 * });</pre></p>
 *
 * <p>Enter Event - When an existing ParseObject's (original) old value doesn't fulfill the ParseQuery
 * but its new value fulfills the ParseQuery, you'll get this event. The object is the
 * ParseObject which enters the ParseQuery. Its content is the latest value of the ParseObject.
 *
 * Parse-Server 3.1.3+ Required for original object parameter
 *
 * <pre>
 * subscription.on('enter', (object, original) => {
 *
 * });</pre></p>
 *
 *
 * <p>Update Event - When an existing ParseObject's old value fulfills the ParseQuery but its new value
 * doesn't fulfill the ParseQuery, you'll get this event. The object is the ParseObject
 * which leaves the ParseQuery. Its content is the latest value of the ParseObject.
 *
 * <pre>
 * subscription.on('leave', (object) => {
 *
 * });</pre></p>
 *
 *
 * <p>Delete Event - When an existing ParseObject which fulfills the ParseQuery is deleted, you'll
 * get this event. The object is the ParseObject which is deleted.
 *
 * <pre>
 * subscription.on('delete', (object) => {
 *
 * });</pre></p>
 *
 *
 * <p>Close Event - When the client loses the WebSocket connection to the LiveQuery
 * server and we stop receiving events, you'll get this event.
 *
 * <pre>
 * subscription.on('close', () => {
 *
 * });</pre></p>
 *
 * @alias Parse.LiveQuerySubscription
 */

class Subscription extends EventEmitter {
  /*
   * @param {string} id - subscription id
   * @param {string} query - query to subscribe to
   * @param {string} sessionToken - optional session token
   */
  constructor(id, query, sessionToken) {
    super();
    this.id = id;
    this.query = query;
    this.sessionToken = sessionToken; // adding listener so process does not crash
    // best practice is for developer to register their own listener

    this.on('error', () => {});
  }
  /**
   * Close the subscription
   */


  unsubscribe()
  /*: Promise*/
  {
    return CoreManager.getLiveQueryController().getDefaultLiveQueryClient().then(liveQueryClient => {
      liveQueryClient.unsubscribe(this);
      this.emit('close');
    });
  }

}

export default Subscription;