/**
 * @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.href.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
    });
};