/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");

/**** 
* 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 = 0.8;
	self.flapPower = -12;
	self.flipped = false;
	self.flap = function () {
		self.velocity = self.flapPower;
		self.flipped = !self.flipped;
		if (self.flipped) {
			birdGraphics.rotation = Math.PI;
		} else {
			birdGraphics.rotation = 0;
		}
		LK.getSound('flap').play();
	};
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		// Rotate bird based on velocity
		var targetRotation = self.flipped ? Math.PI : 0;
		if (self.velocity > 0) {
			targetRotation += self.flipped ? -0.5 : 0.5;
		} else {
			targetRotation += self.flipped ? 0.3 : -0.3;
		}
		birdGraphics.rotation = targetRotation;
		// Check boundaries
		if (self.y < -30 || self.y > 2732 + 30) {
			gameOver = true;
		}
	};
	return self;
});
var Pipe = Container.expand(function (isTop) {
	var self = Container.call(this);
	var pipeGraphics = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: isTop ? 1 : 0
	});
	self.speed = -4;
	self.scored = false;
	self.isTop = isTop;
	self.update = function () {
		self.x += self.speed;
		if (self.x < -100) {
			self.destroy();
		}
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var gameOver = false;
var gameStarted = false;
var pipeTimer = 0;
var gapSize = 300;
var pipeSpacing = 400;
// UI Elements
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
var instructionTxt = new Text2('TAP TO START', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
game.addChild(instructionTxt);
instructionTxt.x = 1024;
instructionTxt.y = 1366;
// Initialize bird
bird = new Bird();
bird.x = 400;
bird.y = 1366;
game.addChild(bird);
function createPipePair() {
	var gapCenter = 400 + Math.random() * (2732 - 800);
	var topHeight = gapCenter - gapSize / 2;
	var bottomY = gapCenter + gapSize / 2;
	// Top pipe
	var topPipe = new Pipe(true);
	topPipe.x = 2048 + 100;
	topPipe.y = topHeight;
	pipes.push(topPipe);
	game.addChild(topPipe);
	// Bottom pipe
	var bottomPipe = new Pipe(false);
	bottomPipe.x = 2048 + 100;
	bottomPipe.y = bottomY;
	pipes.push(bottomPipe);
	game.addChild(bottomPipe);
}
function resetGame() {
	// Remove all pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		pipes[i].destroy();
	}
	pipes = [];
	// Reset bird
	bird.x = 400;
	bird.y = 1366;
	bird.velocity = 0;
	bird.flipped = false;
	bird.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	}).rotation = 0;
	// Reset game state
	gameOver = false;
	gameStarted = false;
	pipeTimer = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	// Show instruction
	instructionTxt.alpha = 1;
}
game.down = function (x, y, obj) {
	if (gameOver) {
		LK.showGameOver();
		return;
	}
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.alpha = 0;
	}
	bird.flap();
};
game.update = function () {
	if (gameOver) {
		return;
	}
	if (!gameStarted) {
		return;
	}
	// Update bird
	bird.update();
	// Create pipes
	pipeTimer++;
	if (pipeTimer >= pipeSpacing / 4) {
		createPipePair();
		pipeTimer = 0;
		// Increase difficulty slightly
		if (gapSize > 200) {
			gapSize -= 0.5;
		}
	}
	// Update pipes and check collisions
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Check if pipe is destroyed
		if (pipe.parent === null) {
			pipes.splice(i, 1);
			continue;
		}
		// Check collision
		if (bird.intersects(pipe)) {
			LK.getSound('hit').play();
			gameOver = true;
			LK.showGameOver();
			return;
		}
		// Check scoring (only for top pipes to avoid double scoring)
		if (pipe.isTop && !pipe.scored && pipe.x < bird.x - 30) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore().toString());
			LK.getSound('score').play();
		}
	}
};