var Dot = Container.expand(function () {
	var self = Container.call(this);
	var dotGraphics = self.createAsset('dot', 'Dot Graphics', .5, .5);
	self.eaten = false;
});
var Snake = Container.expand(function () {
	var self = Container.call(this);
	var gridSize = 128 * 5;
	var snakeGraphics = self.createAsset('snake', 'Snake Graphics', .5, .5);
	self.length = 1;
	self.direction = 'right';
	self.body = [];
	self.move = function () {
		var gridSize = 128;
		var oldHeadPosition = {
			x: snakeGraphics.x,
			y: snakeGraphics.y
		};
		switch (self.direction) {
			case 'right':
				snakeGraphics.x = Math.round((snakeGraphics.x + gridSize) / gridSize) * gridSize;
				break;
			case 'left':
				snakeGraphics.x = Math.round((snakeGraphics.x - gridSize) / gridSize) * gridSize;
				break;
			case 'down':
				snakeGraphics.y = Math.round((snakeGraphics.y + gridSize) / gridSize) * gridSize;
				break;
			case 'up':
				snakeGraphics.y = Math.round((snakeGraphics.y - gridSize) / gridSize) * gridSize;
				break;
		}
		for (var i = self.body.length - 1; i > 0; i--) {
			self.body[i].x = self.body[i - 1].x;
			self.body[i].y = self.body[i - 1].y;
		}
		if (self.body.length > 0) {
			self.body[0].x = oldHeadPosition.x;
			self.body[0].y = oldHeadPosition.y;
		}
	};
	self.eat = function (dot) {
		self.length++;
		var newSegment = self.createAsset('snakeBody', 'Snake Body Segment', .5, .5);
		self.body.push(newSegment);
		self.addChild(newSegment);
		if (self.body.length > 1) {
			var lastSegment = self.body[self.body.length - 2];
			newSegment.x = lastSegment.x;
			newSegment.y = lastSegment.y;
		}
	};
	self.checkCollision = function () {
		var maxX = 2048;
		var maxY = 2732;
		if (snakeGraphics.x < 0) snakeGraphics.x = maxX - gridSize;
		if (snakeGraphics.x >= maxX) snakeGraphics.x = 0;
		if (snakeGraphics.y < 0) snakeGraphics.y = maxY - gridSize;
		if (snakeGraphics.y >= maxY) snakeGraphics.y = 0;
		for (var i = 0; i < self.body.length; i++) {
			if (self.intersects(self.body[i])) {
				isGameOver = true;
				break;
			}
		}
	};
});
var Game = Container.expand(function () {
	var self = Container.call(this);
	var background = self.createAsset('background', 'Game Background', 0, 0);
	background.width = 2048;
	background.height = 2732;
	self.addChild(background);
	var dots = [];
	var snake = self.addChild(new Snake());
	var score = 0;
	var scoreTxt = new Text2(score.toString(), {
		size: 150,
		fill: "#1a2314",
		font: "'Courier New', monospace"
	});
	scoreTxt.anchor.set(.5, 0);
	LK.gui.topCenter.addChild(scoreTxt);
	var isGameOver = false;
	var tickCounter = 0;
	LK.on('tick', function () {
		tickCounter++;
		if (tickCounter % 5 == 0) {
			snake.move();
			snake.checkCollision();
		}
		if (isGameOver) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
		}
		for (var i = 0; i < dots.length; i++) {
			if (snake.intersects(dots[i]) && !dots[i].eaten) {
				snake.eat(dots[i]);
				dots[i].eaten = true;
				score++;
				scoreTxt.setText(score.toString());
				self.removeChild(dots[i]);
				dots.splice(i, 1);
				spawnDot();
			}
		}
	});
	var startSwipePos = null;
	stage.on('down', function (obj) {
		startSwipePos = obj.event.getLocalPosition(self);
	});
	stage.on('up', function (obj) {
		if (!startSwipePos) return;
		var endSwipePos = obj.event.getLocalPosition(self);
		var dx = endSwipePos.x - startSwipePos.x;
		var dy = endSwipePos.y - startSwipePos.y;
		if (Math.abs(dx) > Math.abs(dy)) {
			snake.direction = dx > 0 ? 'right' : 'left';
		} else {
			snake.direction = dy > 0 ? 'down' : 'up';
		}
		startSwipePos = null;
	});
	var spawnDot = function () {
		var dot = new Dot();
		var gridSize = 128;
		dot.x = Math.floor(Math.random() * (2048 / gridSize)) * gridSize;
		dot.y = Math.floor(Math.random() * (2732 / gridSize)) * gridSize;
		dots.push(dot);
		self.addChild(dot);
	};
	spawnDot();
});