/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 * based on pixi impact spine implementation made by Eemeli Kelokorpi (@ekelokorpi) https://github.com/ekelokorpi
 *
 * Awesome JS run time provided by EsotericSoftware
 * https://github.com/EsotericSoftware/spine-runtimes
 *
 */

/**
 * The Spine loader is used to load in JSON spine data
 * To generate the data you need to use http://esotericsoftware.com/ and export the "JSON" format
 * Due to a clash of names  You will need to change the extension of the spine file from *.json to *.anim for it to load
 * See example 12 (http://www.goodboydigital.com/pixijs/examples/12/) to see a working example and check out the source
 * You will need to generate a sprite sheet to accompany the spine data
 * When loaded this class will dispatch a "loaded" event
 *
 * @class Spine
 * @uses EventTarget
 * @constructor
 * @param url {String} The url of the JSON file
 * @param crossorigin {Boolean} Whether requests should be treated as crossorigin
 */
PIXI.SpineLoader = function(url, crossorigin)
{
	PIXI.EventTarget.call(this);

	/**
	 * The url of the bitmap font data
	 *
	 * @property url
	 * @type String
	 */
	this.url = url;

	/**
	 * Whether the requests should be treated as cross origin
	 *
	 * @property crossorigin
	 * @type Boolean
	 */
	this.crossorigin = crossorigin;

	/**
	 * [read-only] Whether the data has loaded yet
	 *
	 * @property loaded
	 * @type Boolean
	 * @readOnly
	 */
	this.loaded = false;
}

PIXI.SpineLoader.prototype.constructor = PIXI.SpineLoader;

/**
 * Loads the JSON data
 *
 * @method load
 */
PIXI.SpineLoader.prototype.load = function () {

	var scope = this;
	var jsonLoader = new PIXI.JsonLoader(this.url, this.crossorigin);
	jsonLoader.addEventListener("loaded", function (event) {
		scope.json = event.content.json;
		scope.onJSONLoaded();
	});
	jsonLoader.load();
};

/**
 * Invoke when JSON file is loaded
 *
 * @method onJSONLoaded
 * @private
 */
PIXI.SpineLoader.prototype.onJSONLoaded = function (event) {
	var spineJsonParser = new spine.SkeletonJson();
	var skeletonData = spineJsonParser.readSkeletonData(this.json);

	PIXI.AnimCache[this.url] = skeletonData;

	this.onLoaded();
};

/**
 * Invoke when JSON file is loaded
 *
 * @method onLoaded
 * @private
 */
PIXI.SpineLoader.prototype.onLoaded = function () {
	this.loaded = true;
    this.dispatchEvent({type: "loaded", content: this});
};