/* 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/. */

"use strict";

const {Cc,Ci} = require("chrome");
var xpcom = require("./xpcom");

var timerClass = Cc["@mozilla.org/timer;1"];
var nextID = 1;
var timers = {};

function TimerCallback(timerID, callback, params) {
  this._callback = callback;
  this._params = params;
};
TimerCallback.prototype = {
  QueryInterface : xpcom.utils.generateQI([Ci.nsITimerCallback])
};

function TimeoutCallback(timerID, callback, params) {
  memory.track(this);
  TimerCallback.apply(this, arguments)
  this._timerID = timerID;
};
TimeoutCallback.prototype = new TimerCallback();
TimeoutCallback.prototype.notify = function notifyOnTimeout(timer) {
  try {
    delete timers[this._timerID];
    this._callback.apply(null, this._params);
  } catch (e) {
    console.exception(e);
  }
};

function IntervalCallback(timerID, callback, params) {
  memory.track(this);
  TimerCallback.apply(this, arguments)
};
IntervalCallback.prototype = new TimerCallback();
IntervalCallback.prototype.notify = function notifyOnInterval() {
  try {
    this._callback.apply(null, this._params);
  } catch (e) {
    console.exception(e);
  }
};


var setTimeout = exports.setTimeout = function setTimeout(callback, delay) {
  return makeTimer(
    Ci.nsITimer.TYPE_ONE_SHOT,
    callback,
    TimeoutCallback,
    delay,
    Array.slice(arguments, 2));
};

var clearTimeout = exports.clearTimeout = function clearTimeout(timerID) {
  cancelTimer(timerID);
};

var setInterval = exports.setInterval = function setInterval(callback, delay) {
  return makeTimer(
    Ci.nsITimer.TYPE_REPEATING_SLACK,
    callback,
    IntervalCallback,
    delay,
    Array.slice(arguments, 2));
};

var clearInterval = exports.clearInterval = function clearInterval(timerID) {
  cancelTimer(timerID);
};

function makeTimer(type, callback, callbackType, delay, params) {
  var timer = timerClass.createInstance(Ci.nsITimer);

  memory.track(timer, "nsITimer");

  var timerID = nextID++;
  timers[timerID] = timer;

  timer.initWithCallback(
    new callbackType(timerID, callback, params),
    delay || 0,
    type
  );
  return timerID;
}

function cancelTimer(timerID) {
  var timer = timers[timerID];
  if (timer) {
    timer.cancel();
    delete timers[timerID];
  }
}

require("./unload").when(
  function cancelAllPendingTimers() {
    var timerIDs = [timerID for (timerID in timers)];
    timerIDs.forEach(function(timerID) { cancelTimer(timerID); });
  });