/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

const EXPORTED_SYMBOLS = ["appIdleManager"];

// This module provides a mechanism to turn window focus and blur events
// into app idle notifications. If we get a blur notification that is not
// followed by a focus notification in less than some small number of seconds,
// then we send a begin app idle notification.
// If we get a focus event, and we're app idle, then we send an end app idle
// notification.
// The notification topic is "mail:appIdle", the values are "idle", and "back"

var appIdleManager = {
  _appIdle: false,
  _timerInterval: 5000, // 5 seconds ought to be plenty
  get _timer() {
    delete this._timer;
    return (this._timer = Cc["@mozilla.org/timer;1"].createInstance(
      Ci.nsITimer
    ));
  },

  _timerCallback() {
    appIdleManager._appIdle = true;
    Services.obs.notifyObservers(null, "mail:appIdle", "idle");
  },

  onBlur() {
    appIdleManager._timer.initWithCallback(
      appIdleManager._timerCallback,
      appIdleManager._timerInterval,
      Ci.nsITimer.TYPE_ONE_SHOT
    );
  },

  onFocus() {
    appIdleManager._timer.cancel();
    if (appIdleManager._appIdle) {
      appIdleManager._appIdle = false;
      Services.obs.notifyObservers(null, "mail:appIdle", "back");
    }
  },
};