/*
---

name: Loop

description: Runs a class method on a periodical

license: MIT-style license.

authors: Ryan Florence <http://ryanflorence.com>

docs: http://moodocs.net/rpflo/mootools-rpflo/Loop

requires:
- Core/Class

provides: [Loop]

...
*/
var Loop = new Class({
  loopCount: 0,
  isLooping: false,
  loopMethod: function () {},
  setLoop: function (fn, delay) {
    wasLooping = this.isLooping;
    if (wasLooping) this.stopLoop();
    this.loopMethod = fn;
    this.loopDelay = delay || 3000;
    if (wasLooping) this.startLoop();
    return this;
  },
  stopLoop: function () {
    this.isLooping = false;
    clearInterval(this.periodical);
    return this;
  },
  startLoop: function (delay, now) {
    if (!this.isLooping) {
      this.isLooping = true;
      if (now) this.looper();
      this.periodical = this.looper.periodical(delay || this.loopDelay, this);
    };
    return this;
  },
  resetLoop: function () {
    this.loopCount = 0;
    return this;
  },
  looper: function () {
    this.loopCount++;
    this.loopMethod(this.loopCount);
    return this;
  }
});