/**** 
* Classes
****/ 
// Food class
var Food = Container.expand(function () {
	var self = Container.call(this);
	var food = LK.getAsset('apple', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(food);
	self.randomizePosition = function () {
		self.x = Math.floor(Math.random() * (2048 - food.width));
		self.y = Math.floor(Math.random() * (2732 - food.height));
	};
	self.randomizePosition();
});
//<Assets used in the game will automatically appear here>
// Snake class
var Snake = Container.expand(function () {
	var self = Container.call(this);
	self.segments = [];
	self.direction = {
		x: 1,
		y: 0
	};
	self.speed = 5;
	self.grow = false;
	self.init = function () {
		// Initialize the snake with 3 segments
		for (var i = 0; i < 3; i++) {
			var segment = self.addSegment(1024 - i * 20, 1366);
			self.segments.push(segment);
		}
	};
	self.addSegment = function (x, y) {
		var segment = LK.getAsset('snakeImage', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		segment.x = x;
		segment.y = y;
		game.addChild(segment);
		return segment;
	};
	self.update = function () {
		// Move the snake
		var head = self.segments[0];
		var newX = head.x + self.direction.x * self.speed;
		var newY = head.y + self.direction.y * self.speed;
		// Check for collisions with walls
		if (newX < 0 || newX > 2048 || newY < 0 || newY > 2732) {
			LK.showGameOver();
			return;
		}
		// Check for collisions with itself
		for (var i = 1; i < self.segments.length; i++) {
			if (newX === self.segments[i].x && newY === self.segments[i].y) {
				LK.showGameOver();
				return;
			}
		}
		// Move the segments
		for (var i = self.segments.length - 1; i > 0; i--) {
			self.segments[i].x = self.segments[i - 1].x;
			self.segments[i].y = self.segments[i - 1].y;
		}
		head.x = newX;
		head.y = newY;
		// Grow the snake
		if (self.grow) {
			var tail = self.segments[self.segments.length - 1];
			var newSegment = self.addSegment(tail.x, tail.y);
			self.segments.push(newSegment);
			self.grow = false;
		}
	};
	self.changeDirection = function (newDirection) {
		// Prevent the snake from reversing
		if (self.direction.x + newDirection.x !== 0 || self.direction.y + newDirection.y !== 0) {
			self.direction = newDirection;
		}
	};
	self.init();
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0xD3D3D3 //Init game with light gray background
});

/**** 
* Game Code
****/ 
var snake = new Snake();
game.addChild(snake);
var food = new Food();
game.addChild(food);
// Create a score text and add it to the top right corner of the screen
var scoreTxt = new Text2('0', {
	size: 150,
	fill: "#008000"
});
scoreTxt.anchor.set(1, 0); // Sets anchor to the top right corner of the text.
LK.gui.topRight.addChild(scoreTxt);
game.update = function () {
	snake.update();
	// Check for collision with food
	if (snake.segments[0].intersects(food)) {
		snake.grow = true;
		// Increase the score by 1
		LK.setScore(LK.getScore() + 1);
		// Update the score text
		scoreTxt.setText(LK.getScore());
		// Increase the length of the snake more
		for (var i = 0; i < 5; i++) {
			snake.segments.push(snake.addSegment(snake.segments[snake.segments.length - 1].x, snake.segments[snake.segments.length - 1].y));
		}
		food.randomizePosition();
	}
};
// Handle touch events for direction change
game.down = function (x, y, obj) {
	var head = snake.segments[0];
	var dx = x - head.x;
	var dy = y - head.y;
	var direction;
	if (Math.abs(dx) > Math.abs(dy)) {
		direction = {
			x: dx / Math.abs(dx),
			y: 0
		};
	} else {
		direction = {
			x: 0,
			y: dy / Math.abs(dy)
		};
	}
	snake.changeDirection(direction);
};