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

/**
 * The json file loader is used to load in JSON data and parse it
 * When loaded this class will dispatch a 'loaded' event
 * If loading fails this class will dispatch an '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 PIXI.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() {
                    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
                        });

                        // check to see ifthe sprite ha been trimmed..
                        if (frameData[i].trimmed) {

                            var texture =  PIXI.TextureCache[i];
                            
                            texture.trimmed = true;

                            var actualSize = frameData[i].sourceSize;
                            var realSize = frameData[i].spriteSourceSize;

                            texture.trim.x = realSize.x;
                            texture.trim.y = realSize.y;
                            texture.trim.realWidth = actualSize.w;
                            texture.trim.realHeight = actualSize.h;
                        }
                    }
                }

                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
    });
};