package
{
    import flash.display.*;
    import flash.display.BlendModeShader;
    import flash.display.shaders.BlendModeSoftlight;
    import flash.geom.Matrix;
    import flash.geom.Rectangle;
    import org.flixel.*;

    /**
     * ...
     * @author Lordn
     */
    public class LightOverlay extends FlxGroup
    {
        private var light:Shape;
        private var darkness:BitmapData;
        private var fog:Sprite;

        private var _lightList:Array;

        private var _debug:FlxText;
        public function LightOverlay()
        {
            _lightList = new Array();
            _debug = new FlxText(0, 0, FlxG.width);
            add(_debug);
            _debug.scrollFactor.x = _debug.scrollFactor.y = 0;

            light = new Shape();
            light.blendMode = BlendMode.NORMAL;
            //light.blendShader = new BlendModeSoftlight();

            darkness = new BitmapData((320 / 16) + 1, (240 / 16) + 1, true, 0xff000000);

            //fog = new Sprite();
            //fog.blendMode = BlendMode.MULTIPLY;
            //fog.graphics.beginFill(0x000000, 0.5);
            //fog.graphics.drawRect(0, 0, 320 / 16, 240 / 16);
            //fog.addChild(light);

        }

        public function addLight(light:Light):void
        {
            _lightList.push(light);
        }

        override public function draw():void
        {
            super.draw();

            light.graphics.clear();
            darkness.fillRect( new Rectangle(0, 0, (320 / 16) + 1, (240 / 16) + 1), 0x00000000);

            var xShift:Number = 0;
            var yShift:Number = 0;

            //Shift this to be world-aligned (this makes life weird)
            xShift = FlxG.camera.scroll.x % 16;
            yShift = FlxG.camera.scroll.y % 16;
            //xShift = Math.abs(xShift);

            _debug.text = "xShift: " + xShift + ", yShift: " + yShift + "\n";
            _debug.text += "camScrollX: " + FlxG.camera.scroll.x + ", camScrollY: " + FlxG.camera.scroll.y;
            var lightNum:int = 0;
            for each( var l:Light in _lightList)
            {
                lightNum++;
                //Let's transform the worldspace positions into screenspace
                var screenPos:FlxPoint = l.getScreenXY();

                //Ofset by half a Y coordinate to make us re-align with the grid.
                screenPos.y += 8;
                screenPos.x += 8;

                //var screenX:int =
                light.graphics.beginFill(0xFFFFFF, 0.2);
                light.graphics.drawCircle(screenPos.x / 16, screenPos.y / 16, l.radius / 16);
                light.graphics.endFill();

                _debug.text += "L#: " + lightNum + "sPos.x: " + screenPos.x / 16 + "sPos.y: " + screenPos.y / 16 + "\n";
            }

            darkness.draw(light);
            var scaleMatrix:Matrix = new Matrix(16, 0, 0, 16, xShift, yShift);
            FlxG.camera.buffer.draw(darkness, scaleMatrix, null, BlendMode.NORMAL);
        }

    }

}