(function(window)
{
	function SpaceInvaders(canvasID, imgsrcSpaceship, imgsrcAlien)
	{
		canvas	= document.getElementById(canvasID);
		context	= canvas.getContext('2d');
		stage	= new Stage(canvas);
		Registry.set('STAGE_WIDTH', canvas.width);
		Registry.set('STAGE_HEIGHT', canvas.height);
		Registry.set('CONTEXT', context);
		this.imgsrcSpaceship	= imgsrcSpaceship;
		this.imgsrcAlien		= imgsrcAlien;
		this.initialize();
	}
	SpaceInvaders.prototype = new Container();
		SpaceInvaders.prototype.imgsrcSpaceship	= '';
		SpaceInvaders.prototype.imgsrcAlien		= '';
		// Signals
		SpaceInvaders.prototype.completed		= new signals.Signal();
		// Constructor:
		SpaceInvaders.prototype.Container_initialize = SpaceInvaders.prototype.initialize;	// Unique to avoid overiding base class
		/**
		* INIT METHODS
		*/
		SpaceInvaders.prototype.initialize = function()
		{
			this.Container_initialize();
			this.initLines();
			this.initScoreBoard();
			this.loadSpaceshipBitmap();
		}
		SpaceInvaders.prototype.initLines = function()
		{
			var line1	= new HorisontalLine(Registry.get('STAGE_WIDTH'), 1);
			stage.addChild(line1);
			var line2	= new HorisontalLine(Registry.get('STAGE_WIDTH'), 1);
			line2.y		= 40;
			stage.addChild(line2);
			var line3	= new HorisontalLine(Registry.get('STAGE_WIDTH'), 1);
			line3.y		= Registry.get('STAGE_HEIGHT') - 1;
			stage.addChild(line3);
		}
		SpaceInvaders.prototype.initScoreBoard = function()
		{
			scoreBoard				= new ScoreBoard();
			scoreBoard.x			= Registry.get('STAGE_WIDTH') - 10;
			scoreBoard.y			= 30;
			scoreBoard.mouseEnabled	= false;
			stage.addChild(scoreBoard);
		}
		SpaceInvaders.prototype.loadSpaceshipBitmap = function()
		{
			var _this	= this;
			var loader	= new BitmapLoader(this.imgsrcSpaceship);
			loader.completed.addOnce(function(image){_this.onSpaceshipBitmapLoaded(image);});
			loader.load();
		}
		SpaceInvaders.prototype.onSpaceshipBitmapLoaded = function(image)
		{
			spaceship				= new Spaceship(image);
			spaceship.x				= Math.round((Registry.get('STAGE_WIDTH') - spaceship.width) / 2);
			spaceship.y				= Math.round(Registry.get('STAGE_HEIGHT') - spaceship.height - 15);
			spaceship.offset		= new Point(spaceship.x, spaceship.y);
			spaceship.mouseEnabled	= false;
			stage.addChild(spaceship);
			this.loadAlienBitmap();
		}
		SpaceInvaders.prototype.loadAlienBitmap = function()
		{
			var _this	= this;
			var loader	= new BitmapLoader(this.imgsrcAlien);
			loader.completed.addOnce(function(image){_this.onAlienBitmapLoaded(image);});
			loader.load();
		}
		SpaceInvaders.prototype.onAlienBitmapLoaded = function(image)
		{
			aliens				= new Aliens(image, new Point(25,40));
			aliens.mouseEnabled	= false;
			stage.addChild(aliens);
			this.initGameController();
		}
		SpaceInvaders.prototype.initGameController = function()
		{
			var _this		= this;
			gameController	= new GameController(stage, spaceship, aliens, scoreBoard, new KeyController());
			gameController.completed.add(function(score){_this.onGameCompleted(score);});
			startBtn			= new GenericButton('START SPIL!');
			startBtn.x			= Registry.get('STAGE_WIDTH')/2;
			startBtn.y			= Registry.get('STAGE_HEIGHT')/2 + 100;
			startBtn.onClick	= this.start;
			stage.addChild(startBtn);
		}
		/**
		* SIGNAL METHODS
		*/
		SpaceInvaders.prototype.start = function(e)
		{
			this.onClick	= null;	// this == the btn clicked
			this.parent.removeChild(this);
			gameController.restart();
		}
		SpaceInvaders.prototype.onGameCompleted = function(score)
		{
			playAgainBtn			= new GenericButton('SPIL IGEN!');
			playAgainBtn.x			= Registry.get('STAGE_WIDTH')/2;
			playAgainBtn.y			= Registry.get('STAGE_HEIGHT')/2;
			playAgainBtn.onClick	= this.start;
			stage.addChild(playAgainBtn);
			this.completed.dispatch(score);
		}
	window.SpaceInvaders = SpaceInvaders;
}(window));