/**** 
* Classes
****/
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = LK.getAsset('bird', {});
	birdGraphics.anchor.set(0.5, 0.5);
	self.addChild(birdGraphics);
	self.velocity = 0;
	self.gravity = 0.5;
	self.lift = -15;
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		if (self.y < 0) {
			self.y = 0;
			self.velocity = 0;
		}
		self.rotation += (Math.atan(self.velocity / 10) - self.rotation) * 0.1;
	};
	self.flap = function () {
		self.velocity += self.lift;
	};
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.passed = false;
	var topPipeGraphics = LK.getAsset('pipe', {});
	topPipeGraphics.anchor.set(0.5, 1);
	self.addChild(topPipeGraphics);
	var bottomPipeGraphics = LK.getAsset('pipe', {});
	bottomPipeGraphics.anchor.set(0.5, 0);
	self.addChild(bottomPipeGraphics);
	self.setGap = function (gapSize, gapPosition) {
		topPipeGraphics.y = gapPosition - gapSize / 2;
		bottomPipeGraphics.y = gapPosition + gapSize / 2;
	};
	self.speed = -10;
	self.update = function () {
		self.x += self.speed;
	};
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = LK.getAsset('ground', {});
	groundGraphics.anchor.set(0, 0);
	self.addChild(groundGraphics);
	self.speed = -2;
	self.update = function () {
		self.x += self.speed;
		if (self.x <= -self.width / 2) {
			self.x = 0;
		}
	};
});

/**** 
* Initialize Game
****/
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/
game.setBackgroundColor(0x008080);
var bird = game.addChild(new Bird());
bird.x = 2048 / 4;
bird.y = 2732 / 2;
var ground = game.addChild(new Ground());
ground.y = 2732;
var pipes = [];
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = game.width;
	var gapPosition = Math.random() * (2732 - 400) + 200;
	pipe.setGap(1200, gapPosition);
	pipes.push(pipe);
	game.addChildAt(pipe, 0);
}
function updatePipes() {
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].update();
		pipes[i].speed = -10 - score * 0.5;
		if (pipes[i].x < -game.width) {
			game.removeChild(pipes[i]);
			pipes.splice(i, 1);
			i--;
		}
	}
}
function checkCollision() {
	for (var i = 0; i < pipes.length; i++) {
		if (bird.intersects(pipes[i])) {
			return true;
		}
	}
	return false;
}
function restartGame() {
	bird.y = 2732 / 2;
	bird.velocity = 0;
	for (var i = 0; i < pipes.length; i++) {
		game.removeChild(pipes[i]);
	}
	pipes = [];
	score = 0;
	scoreText.setText(score);
}
var spawnPipeInterval = LK.setInterval(spawnPipe, 2000);
var score = 0;
var scoreText = new Text2('0', {
	size: 150,
	font: "'GillSans-Bold',Impact,'Arial Black',Tahoma",
	fill: "#ffffff"
});
scoreText.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreText);
LK.on('tick', function () {
	bird.update();
	ground.update();
	updatePipes();
	if (checkCollision() || bird.y + bird.height / 2 >= ground.y) {
		LK.showGameOver(restartGame);
	} else {
		for (var i = 0; i < pipes.length; i++) {
			if (pipes[i].x + pipes[i].width / 2 < bird.x && !pipes[i].passed) {
				pipes[i].passed = true;
				score++;
				LK.setScore(score);
				scoreText.setText(score);
			}
		}
	}
});
game.on('down', function () {
	bird.flap();
});