/**** 
* Classes
****/ 
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdGraphics = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.velocity = 0;
	self.gravity = 0.5;
	self.flapPower = -15;
	self.rotation = 0;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
	};
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		// Rotate bird based on velocity
		self.rotation = Math.min(Math.max(self.velocity * 0.05, -0.5), 1.2);
		birdGraphics.rotation = self.rotation;
		// Check ground collision
		if (self.y > 2732 - 150) {
			self.y = 2732 - 150;
			gameOver = true;
		}
		// Check ceiling collision
		if (self.y < 50) {
			self.y = 50;
			gameOver = true;
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.gapSize = 400;
	self.speed = -3;
	self.scored = false;
	// Create top pipe
	self.topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Create bottom pipe
	self.bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setGapPosition = function (gapY) {
		self.topPipe.y = gapY - self.gapSize / 2;
		self.bottomPipe.y = gapY + self.gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
		// Check if bird passed through pipe
		if (!self.scored && self.x < bird.x) {
			self.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB
});

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var ground;
var scoreTxt;
var gameOver = false;
var gameStarted = false;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 120; // frames between pipe spawns
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 1,
	x: 0,
	y: 2732
}));
// Create bird
bird = game.addChild(new Bird());
bird.x = 300;
bird.y = 2732 / 2;
// Create score text
scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 100;
// Create instruction text
var instructionTxt = new Text2('TAP TO START', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionTxt);
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60;
	// Random gap position between 200 and 2532 (accounting for gap size)
	var gapY = 200 + Math.random() * (2532 - 400);
	pipe.setGapPosition(gapY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function checkCollisions() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check collision with top pipe
		if (bird.intersects(pipe.topPipe)) {
			gameOver = true;
			LK.getSound('hit').play();
			return;
		}
		// Check collision with bottom pipe  
		if (bird.intersects(pipe.bottomPipe)) {
			gameOver = true;
			LK.getSound('hit').play();
			return;
		}
	}
}
function cleanupPipes() {
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		if (pipe.x < -100) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
}
game.down = function (x, y, obj) {
	if (gameOver) {
		return;
	}
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
	}
	bird.flap();
};
game.update = function () {
	if (gameOver) {
		LK.showGameOver();
		return;
	}
	if (!gameStarted) {
		return;
	}
	// Update bird
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Check collisions
	checkCollisions();
	// Cleanup off-screen pipes
	cleanupPipes();
};