/**
 * Autoplay Plugin
 * @version 2.0.0-beta.3
 * @author Bartosz Wojciechowski
 * @author Artus Kolanowski
 * @license The MIT License (MIT)
 */
;(function($, window, document, undefined) {

	/**
	 * Creates the autoplay plugin.
	 * @class The Autoplay Plugin
	 * @param {Owl} scope - The Owl Carousel
	 */
	var Autoplay = function(carousel) {
		/**
		 * Reference to the core.
		 * @protected
		 * @type {Owl}
		 */
		this._core = carousel;

		/**
		 * The autoplay interval.
		 * @type {Number}
		 */
		this._interval = null;

		/**
		 * Indicates whenever the autoplay is paused.
		 * @type {Boolean}
		 */
		this._paused = false;

		/**
		 * All event handlers.
		 * @protected
		 * @type {Object}
		 */
		this._handlers = {
			'changed.owl.carousel': $.proxy(function(e) {
				if (e.namespace && e.property.name === 'settings') {
					if (this._core.settings.autoplay) {
						this.play();
					} else {
						this.stop();
					}
				}
			}, this),
			'initialized.owl.carousel': $.proxy(function(e) {
				if (e.namespace && this._core.settings.autoplay) {
					this.play();
				}
			}, this),
			'play.owl.autoplay': $.proxy(function(e, t, s) {
				if (e.namespace) {
					this.play(t, s);
				}
			}, this),
			'stop.owl.autoplay': $.proxy(function(e) {
				if (e.namespace) {
					this.stop();
				}
			}, this),
			'mouseover.owl.autoplay': $.proxy(function() {
				if (this._core.settings.autoplayHoverPause && this._core.is('rotating')) {
					this.pause();
				}
			}, this),
			'mouseleave.owl.autoplay': $.proxy(function() {
				if (this._core.settings.autoplayHoverPause && this._core.is('rotating')) {
					this.play();
				}
			}, this)
		};

		// register event handlers
		this._core.$element.on(this._handlers);

		// set default options
		this._core.options = $.extend({}, Autoplay.Defaults, this._core.options);
	};

	/**
	 * Default options.
	 * @public
	 */
	Autoplay.Defaults = {
		autoplay: false,
		autoplayTimeout: 5000,
		autoplayHoverPause: false,
		autoplaySpeed: false
	};

	/**
	 * Starts the autoplay.
	 * @public
	 * @param {Number} [timeout] - The interval before the next animation starts.
	 * @param {Number} [speed] - The animation speed for the animations.
	 */
	Autoplay.prototype.play = function(timeout, speed) {
		this._paused = false;

		if (this._core.is('rotating')) {
			return;
		}

		this._core.enter('rotating');

		this._interval = window.setInterval($.proxy(function() {
			if (this._paused || this._core.is('busy') || this._core.is('interacting') || document.hidden) {
				return;
			}
			this._core.next(speed || this._core.settings.autoplaySpeed);
		}, this), timeout || this._core.settings.autoplayTimeout);
	};

	/**
	 * Stops the autoplay.
	 * @public
	 */
	Autoplay.prototype.stop = function() {
		if (!this._core.is('rotating')) {
			return;
		}

		window.clearInterval(this._interval);
		this._core.leave('rotating');
	};

	/**
	 * Stops the autoplay.
	 * @public
	 */
	Autoplay.prototype.pause = function() {
		if (!this._core.is('rotating')) {
			return;
		}

		this._paused = true;
	};

	/**
	 * Destroys the plugin.
	 */
	Autoplay.prototype.destroy = function() {
		var handler, property;

		this.stop();

		for (handler in this._handlers) {
			this._core.$element.off(handler, this._handlers[handler]);
		}
		for (property in Object.getOwnPropertyNames(this)) {
			typeof this[property] != 'function' && (this[property] = null);
		}
	};

	$.fn.owlCarousel.Constructor.Plugins.autoplay = Autoplay;

})(window.Zepto || window.jQuery, window, document);
