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

/**
 * The CanvasRenderer draws the Stage and all its content onto a 2d canvas. This renderer should be used for browsers that do not support webGL.
 * Don't forget to add the CanvasRenderer.view to your DOM or you will not see anything :)
 *
 * @class CanvasRenderer
 * @constructor
 * @param [width=800] {Number} the width of the canvas view
 * @param [height=600] {Number} the height of the canvas view
 * @param [options] {Object} The optional renderer parameters
 * @param [options.view] {HTMLCanvasElement} the canvas to use as a view, optional
 * @param [options.transparent=false] {Boolean} If the render view is transparent, default false
 * @param [options.resolution=1] {Number} the resolution of the renderer retina would be 2
 * @param [options.clearBeforeRender=true] {Boolean} This sets if the CanvasRenderer will clear the canvas or not before the new render pass.
 */
PIXI.CanvasRenderer = function(width, height, options)
{
    if(options)
    {
        for (var i in PIXI.defaultRenderOptions)
        {
            if (typeof options[i] === "undefined") options[i] = PIXI.defaultRenderOptions[i];
        }
    }
    else
    {
        options = PIXI.defaultRenderOptions;
    }

    if(!PIXI.defaultRenderer)
    {
        PIXI.sayHello("Canvas");
        PIXI.defaultRenderer = this;
    }

    /**
     * The renderer type.
     *
     * @property type
     * @type Number
     */
    this.type = PIXI.CANVAS_RENDERER;

    /**
     * The resolution of the canvas.
     *
     * @property resolution
     * @type Number
     */
    this.resolution = options.resolution;

    /**
     * This sets if the CanvasRenderer will clear the canvas or not before the new render pass.
     * If the Stage is NOT transparent Pixi will use a canvas sized fillRect operation every frame to set the canvas background color.
     * If the Stage is transparent Pixi will use clearRect to clear the canvas every frame.
     * Disable this by setting this to false. For example if your game has a canvas filling background image you often don't need this set.
     *
     * @property clearBeforeRender
     * @type Boolean
     * @default
     */
    this.clearBeforeRender = options.clearBeforeRender;

    /**
     * Whether the render view is transparent
     *
     * @property transparent
     * @type Boolean
     */
    this.transparent = options.transparent;
    
    /**
     * The width of the canvas view
     *
     * @property width
     * @type Number
     * @default 800
     */
    this.width = width || 800;

    /**
     * The height of the canvas view
     *
     * @property height
     * @type Number
     * @default 600
     */
    this.height = height || 600;

    this.width *= this.resolution;
    this.height *= this.resolution;

    /**
     * The canvas element that everything is drawn to.
     *
     * @property view
     * @type HTMLCanvasElement
     */
    this.view = options.view || document.createElement( "canvas" );

    /**
     * The canvas 2d context that everything is drawn with
     * @property context
     * @type CanvasRenderingContext2D 2d Context
     */
    this.context = this.view.getContext( "2d", { alpha: this.transparent } );

    /**
     * Boolean flag controlling canvas refresh.
     *
     * @property refresh
     * @type Boolean
     */
    this.refresh = true;

    this.view.width = this.width * this.resolution;
    this.view.height = this.height * this.resolution;

    /**
     * Internal var.
     *
     * @property count
     * @type Number
     */
    this.count = 0;

    /**
     * Instance of a PIXI.CanvasMaskManager, handles masking when using the canvas renderer
     * @property CanvasMaskManager
     * @type CanvasMaskManager
     */
    this.maskManager = new PIXI.CanvasMaskManager();

    /**
     * The render session is just a bunch of parameter used for rendering
     * @property renderSession
     * @type Object
     */
    this.renderSession = {
        context: this.context,
        maskManager: this.maskManager,
        scaleMode: null,
        smoothProperty: null,
        /**
         * If true Pixi will Math.floor() x/y values when rendering, stopping pixel interpolation.
         * Handy for crisp pixel art and speed on legacy devices.
         *
         */
        roundPixels: false
    };

    this.mapBlendModes();
    
    this.resize(width, height);

    if("imageSmoothingEnabled" in this.context)
        this.renderSession.smoothProperty = "imageSmoothingEnabled";
    else if("webkitImageSmoothingEnabled" in this.context)
        this.renderSession.smoothProperty = "webkitImageSmoothingEnabled";
    else if("mozImageSmoothingEnabled" in this.context)
        this.renderSession.smoothProperty = "mozImageSmoothingEnabled";
    else if("oImageSmoothingEnabled" in this.context)
        this.renderSession.smoothProperty = "oImageSmoothingEnabled";
    else if ("msImageSmoothingEnabled" in this.context)
        this.renderSession.smoothProperty = "msImageSmoothingEnabled";
};

// constructor
PIXI.CanvasRenderer.prototype.constructor = PIXI.CanvasRenderer;

/**
 * Renders the Stage to this canvas view
 *
 * @method render
 * @param stage {Stage} the Stage element to be rendered
 */
PIXI.CanvasRenderer.prototype.render = function(stage)
{
    stage.updateTransform();

    this.context.setTransform(1,0,0,1,0,0);

    this.context.globalAlpha = 1;

    this.renderSession.currentBlendMode = PIXI.blendModes.NORMAL;
    this.context.globalCompositeOperation = PIXI.blendModesCanvas[PIXI.blendModes.NORMAL];

    if (navigator.isCocoonJS && this.view.screencanvas) {
        this.context.fillStyle = "black";
        this.context.clear();
    }
    
    if (this.clearBeforeRender)
    {
        if (this.transparent)
        {
            this.context.clearRect(0, 0, this.width, this.height);
        }
        else
        {
            this.context.fillStyle = stage.backgroundColorString;
            this.context.fillRect(0, 0, this.width , this.height);
        }
    }
    
    this.renderDisplayObject(stage);

    // run interaction!
    if(stage.interactive)
    {
        //need to add some events!
        if(!stage._interactiveEventsAdded)
        {
            stage._interactiveEventsAdded = true;
            stage.interactionManager.setTarget(this);
        }
    }
};

/**
 * Resizes the canvas view to the specified width and height
 *
 * @method resize
 * @param width {Number} the new width of the canvas view
 * @param height {Number} the new height of the canvas view
 */
PIXI.CanvasRenderer.prototype.resize = function(width, height)
{
    this.width = width * this.resolution;
    this.height = height * this.resolution;

    this.view.width = this.width;
    this.view.height = this.height;

    this.view.style.width = this.width / this.resolution + "px";
    this.view.style.height = this.height / this.resolution + "px";
};

/**
 * Renders a display object
 *
 * @method renderDisplayObject
 * @param displayObject {DisplayObject} The displayObject to render
 * @param context {CanvasRenderingContext2D} the context 2d method of the canvas
 * @private
 */
PIXI.CanvasRenderer.prototype.renderDisplayObject = function(displayObject, context)
{
    this.renderSession.context = context || this.context;
    this.renderSession.resolution = this.resolution;
    displayObject._renderCanvas(this.renderSession);
};

/**
 * Maps Pixi blend modes to canvas blend modes.
 *
 * @method mapBlendModes
 * @private
 */
PIXI.CanvasRenderer.prototype.mapBlendModes = function()
{
    if(!PIXI.blendModesCanvas)
    {
        PIXI.blendModesCanvas = [];

        if(PIXI.canUseNewCanvasBlendModes())
        {
            PIXI.blendModesCanvas[PIXI.blendModes.NORMAL]   = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.ADD]      = "lighter"; //IS THIS OK???
            PIXI.blendModesCanvas[PIXI.blendModes.MULTIPLY] = "multiply";
            PIXI.blendModesCanvas[PIXI.blendModes.SCREEN]   = "screen";
            PIXI.blendModesCanvas[PIXI.blendModes.OVERLAY]  = "overlay";
            PIXI.blendModesCanvas[PIXI.blendModes.DARKEN]   = "darken";
            PIXI.blendModesCanvas[PIXI.blendModes.LIGHTEN]  = "lighten";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR_DODGE] = "color-dodge";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR_BURN] = "color-burn";
            PIXI.blendModesCanvas[PIXI.blendModes.HARD_LIGHT] = "hard-light";
            PIXI.blendModesCanvas[PIXI.blendModes.SOFT_LIGHT] = "soft-light";
            PIXI.blendModesCanvas[PIXI.blendModes.DIFFERENCE] = "difference";
            PIXI.blendModesCanvas[PIXI.blendModes.EXCLUSION] = "exclusion";
            PIXI.blendModesCanvas[PIXI.blendModes.HUE]       = "hue";
            PIXI.blendModesCanvas[PIXI.blendModes.SATURATION] = "saturation";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR]      = "color";
            PIXI.blendModesCanvas[PIXI.blendModes.LUMINOSITY] = "luminosity";
        }
        else
        {
            // this means that the browser does not support the cool new blend modes in canvas "cough" ie "cough"
            PIXI.blendModesCanvas[PIXI.blendModes.NORMAL]   = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.ADD]      = "lighter"; //IS THIS OK???
            PIXI.blendModesCanvas[PIXI.blendModes.MULTIPLY] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.SCREEN]   = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.OVERLAY]  = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.DARKEN]   = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.LIGHTEN]  = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR_DODGE] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR_BURN] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.HARD_LIGHT] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.SOFT_LIGHT] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.DIFFERENCE] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.EXCLUSION] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.HUE]       = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.SATURATION] = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.COLOR]      = "source-over";
            PIXI.blendModesCanvas[PIXI.blendModes.LUMINOSITY] = "source-over";
        }
    }
};