/**
 * @author Mat Groves http://matgroves.com/ @Doormat23
 */

/**
 * The json file loader is used to load in JSON data and parsing it
 * When loaded this class will dispatch a "loaded" event
 * If load failed this class will dispatch a "error" event
 *
 * @class JsonLoader
 * @uses EventTarget
 * @constructor
 * @param url {String} The url of the JSON file
 * @param crossorigin {Boolean} Whether requests should be treated as crossorigin
 */
PIXI.JsonLoader = 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] The base url of the bitmap font data
	 *
	 * @property baseUrl
	 * @type String
	 * @readOnly
	 */
	this.baseUrl = url.replace(/[^\/]*$/, "");

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

};

// constructor
PIXI.JsonLoader.prototype.constructor = PIXI.JsonLoader;

/**
 * Loads the JSON data
 *
 * @method load
 */
PIXI.JsonLoader.prototype.load = function () {
	this.ajaxRequest = new AjaxRequest();
	var scope = this;
	this.ajaxRequest.onreadystatechange = function () {
		scope.onJSONLoaded();
	};

	this.ajaxRequest.open("GET", this.url, true);
	if (this.ajaxRequest.overrideMimeType) this.ajaxRequest.overrideMimeType("application/json");
	this.ajaxRequest.send(null);
};

/**
 * Invoke when JSON file is loaded
 *
 * @method onJSONLoaded
 * @private
 */
PIXI.JsonLoader.prototype.onJSONLoaded = function () {
	if (this.ajaxRequest.readyState == 4) {
		if (this.ajaxRequest.status == 200 || window.location.protocol.indexOf("http") == -1) {
			this.json = JSON.parse(this.ajaxRequest.responseText);

			if(this.json.frames)
			{
				// sprite sheet
				var scope = this;
				var textureUrl = this.baseUrl + this.json.meta.image;
				var image = new PIXI.ImageLoader(textureUrl, this.crossorigin);
				var frameData = this.json.frames;

				this.texture = image.texture.baseTexture;
				image.addEventListener("loaded", function (event) {
					scope.onLoaded();
				});

				for (var i in frameData) {
					var rect = frameData[i].frame;
					if (rect) {
						PIXI.TextureCache[i] = new PIXI.Texture(this.texture, {
							x: rect.x,
							y: rect.y,
							width: rect.w,
							height: rect.h
						});
						if (frameData[i].trimmed) {
							//var realSize = frameData[i].spriteSourceSize;
							PIXI.TextureCache[i].realSize = frameData[i].spriteSourceSize;
							PIXI.TextureCache[i].trim.x = 0; // (realSize.x / rect.w)
							// calculate the offset!
						}
					}
				}

				image.load();

			}
			else if(this.json.bones)
			{
				// spine animation
				var spineJsonParser = new spine.SkeletonJson();
				var skeletonData = spineJsonParser.readSkeletonData(this.json);
				PIXI.AnimCache[this.url] = skeletonData;
				this.onLoaded();
			}
			else
			{
				this.onLoaded();
			}
		}
		else
		{
			this.onError();
		}
	}
};

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

/**
 * Invoke when error occured
 *
 * @method onError
 * @private
 */
PIXI.JsonLoader.prototype.onError = function () {
	this.dispatchEvent({
		type: "error",
		content: this
	});
};