(function() {
  'use strict';
  window.textsecure = window.textsecure || {};

  function SyncRequest(sender, receiver) {
    if (
      !(sender instanceof textsecure.MessageSender) ||
      !(receiver instanceof textsecure.MessageReceiver)
    ) {
      throw new Error(
        'Tried to construct a SyncRequest without MessageSender and MessageReceiver'
      );
    }
    this.receiver = receiver;

    this.oncontact = this.onContactSyncComplete.bind(this);
    receiver.addEventListener('contactsync', this.oncontact);

    this.ongroup = this.onGroupSyncComplete.bind(this);
    receiver.addEventListener('groupsync', this.ongroup);

    console.log('SyncRequest created. Sending contact sync message...');
    sender
      .sendRequestContactSyncMessage()
      .then(function() {
        console.log('SyncRequest now sending group sync messsage...');
        return sender.sendRequestGroupSyncMessage();
      })
      .catch(function(error) {
        console.log(
          'SyncRequest error:',
          error && error.stack ? error.stack : error
        );
      });
    this.timeout = setTimeout(this.onTimeout.bind(this), 60000);
  }

  SyncRequest.prototype = new textsecure.EventTarget();
  SyncRequest.prototype.extend({
    constructor: SyncRequest,
    onContactSyncComplete: function() {
      this.contactSync = true;
      this.update();
    },
    onGroupSyncComplete: function() {
      this.groupSync = true;
      this.update();
    },
    update: function() {
      if (this.contactSync && this.groupSync) {
        this.dispatchEvent(new Event('success'));
        this.cleanup();
      }
    },
    onTimeout: function() {
      if (this.contactSync || this.groupSync) {
        this.dispatchEvent(new Event('success'));
      } else {
        this.dispatchEvent(new Event('timeout'));
      }
      this.cleanup();
    },
    cleanup: function() {
      clearTimeout(this.timeout);
      this.receiver.removeEventListener('contactsync', this.oncontact);
      this.receiver.removeEventListener('groupSync', this.ongroup);
      delete this.listeners;
    },
  });

  textsecure.SyncRequest = function(sender, receiver) {
    var syncRequest = new SyncRequest(sender, receiver);
    this.addEventListener = syncRequest.addEventListener.bind(syncRequest);
    this.removeEventListener = syncRequest.removeEventListener.bind(
      syncRequest
    );
  };

  textsecure.SyncRequest.prototype = {
    constructor: textsecure.SyncRequest,
  };
})();