package com.muxxu.mush.contaminator.components {
    import com.nurun.core.lang.Disposable;
    import com.nurun.utils.math.MathUtils;

    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.BitmapDataChannel;
    import flash.display.InterpolationMethod;
    import flash.display.Shape;
    import flash.display.SpreadMethod;
    import flash.display.Sprite;
    import flash.events.Event;
    import flash.filters.BlurFilter;
    import flash.geom.Matrix;
    import flash.geom.Point;

    /**
     *
     * @author Poil
     * @date 5 sept. 2012;
     */
    public class Fog extends Sprite {
        private var _p1:Point;
        private var _p2:Point;
        private var _bmd:BitmapData;
        private var _holder:Sprite;
        private var _maskMc:Shape;
        private var _seed:Number;




        /* *********** *
         * CONSTRUCTOR *
         * *********** */
        /**
         * Creates an instance of <code>Fog</code>.
         */
        public function Fog() {
            addEventListener(Event.ADDED_TO_STAGE, initialize);
        }



        /* ***************** *
         * GETTERS / SETTERS *
         * ***************** */
        override public function get height():Number {
            return 200;
        }



        /* ****** *
         * PUBLIC *
         * ****** */

        public function stop():void {
            removeEventListener(Event.ENTER_FRAME, enterFrameHandler);
            while(numChildren > 0) {
                if(getChildAt(0) is Disposable) Disposable(getChildAt(0)).dispose();
                removeChildAt(0);
            }
            _bmd.dispose();
            _holder.mask = null;
        }




        /* ******* *
         * PRIVATE *
         * ******* */
        /**
         * Initialize the class.
         */
        private function initialize(event:Event):void {
            removeEventListener(Event.ADDED_TO_STAGE, initialize);
            _p1 = new Point();
            _p2 = new Point();
            _bmd = new BitmapData(150, 400, true, 0);
            _maskMc = addChild(new Shape()) as Shape;
            _seed = MathUtils.randomNumberFromRange(0, 99999999999999);

            var m:Matrix = new Matrix();
            m.createGradientBox(_bmd.width, _bmd.height, Math.PI*.5);
            _maskMc.graphics.beginGradientFill("linear", [0xff0000,0xff0000], [0,.5], [0,0x5f], m, SpreadMethod.PAD, InterpolationMethod.RGB);
            _maskMc.graphics.drawRect(0, 0, _bmd.width, _bmd.height);
            _maskMc.graphics.endFill();

            _holder = addChild(new Sprite()) as Sprite;
            _holder.addChild(new Bitmap(_bmd));

            _holder.cacheAsBitmap = true;
            _maskMc.cacheAsBitmap = true;
            _holder.mask = _maskMc;

            //*
            _holder.width = stage.stageWidth;
            _holder.height = height;
            //*/
            _maskMc.x = _holder.x;
            _maskMc.y = _holder.y;
            _maskMc.width = _holder.width;
            _maskMc.height = _holder.height;

            addEventListener(Event.ENTER_FRAME, enterFrameHandler);
        }

        private function enterFrameHandler(event:Event):void {
            _p1.x += .5;
            _p2.x -= .5;
            _bmd.fillRect(_bmd.rect, 0);
            _bmd.perlinNoise(200, 200, 2, _seed, true, true, BitmapDataChannel.ALPHA, true, [_p1, _p2]);
            _bmd.threshold(_bmd, _bmd.rect, new Point(), "<", 0x777777, 0, 0xffffff, true);
            _bmd.applyFilter(_bmd, _bmd.rect, new Point(), new BlurFilter(30,30,2));
        }

    }
}