var Tile = Container.expand(function (value) {
	var self = Container.call(this);
	self.value = value || 2;
	var tileGraphics = self.createAsset('tile', 'Tile Graphics', 0, 0);
	var tileLabel = new Text2(self.value.toString(), {
		size: 300,
		fill: '#ffffff',
		font: 'bold'
	});
	tileLabel.anchor.set(0.5, 0.5);
	tileLabel.x = tileGraphics.width / 2;
	tileLabel.y = tileGraphics.height / 2;
	tileGraphics.addChild(tileLabel);
	self.setPosition = function (x, y) {
		self.x = x * squareSize;
		self.y = y * squareSize;
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	LK.stageContainer.setBackgroundColor(0xD3D3D3);
	var gridContainer = new Container();
	gridContainer.x = 44;
	gridContainer.y = 200;
	self.addChild(gridContainer);
	var gridSize = 4;
	var squares = new Array(gridSize).fill().map(() => new Array(gridSize).fill(null));
	var squareSize = 500;
	for (var i = 0; i < gridSize; i++) {
		for (var j = 0; j < gridSize; j++) {
			squares[i][j] = null;
		}
	}
	var initialTiles = 2;
	for (var i = 0; i < initialTiles; i++) {
		var x, y;
		do {
			x = Math.floor(Math.random() * gridSize);
			y = Math.floor(Math.random() * gridSize);
		} while (squares[x][y] !== null);
		var square = new Tile();
		square.setPosition(x, y);
		squares[x][y] = square;
		gridContainer.addChild(square);
	}
	var swipeStart = {
		x: 0,
		y: 0
	};
	var swipeEnd = {
		x: 0,
		y: 0
	};
	self.moveTiles = function (direction) {
		var dx = (direction === 'right') - (direction === 'left');
		var dy = (direction === 'down') - (direction === 'up');
		for (var i = 0; i < gridSize; i++) {
			for (var j = 0; j < gridSize; j++) {
				var x = i + dx;
				var y = j + dy;
				if (x >= 0 && x < gridSize && y >= 0 && y < gridSize && squares[i][j] !== null && squares[x][y] === null) {
					squares[x][y] = squares[i][j];
					squares[i][j] = null;
					squares[x][y].setPosition(x, y);
				}
			}
		}
	};
	stage.on('down', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		swipeStart = {
			x: pos.x,
			y: pos.y
		};
	});
	stage.on('up', function (obj) {
		var pos = obj.event.getLocalPosition(self);
		swipeEnd = {
			x: pos.x,
			y: pos.y
		};
		var dx = swipeEnd.x - swipeStart.x;
		var dy = swipeEnd.y - swipeStart.y;
		var threshold = 50;
		if (Math.abs(dx) > threshold || Math.abs(dy) > threshold) {
			if (Math.abs(dx) > Math.abs(dy)) {
				if (dx > 0) {
					self.moveTiles('right');
				} else {
					self.moveTiles('left');
				}
			} else {
				if (dy > 0) {
					self.moveTiles('down');
				} else {
					self.moveTiles('up');
				}
			}
		}
	});
});