/**** 
* 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.velocityY = 0;
	self.gravity = 0.8;
	self.flapPower = -12;
	self.maxFallSpeed = 15;
	self.flap = function () {
		self.velocityY = self.flapPower;
		LK.getSound('flap').play();
		// Bird animation - slight rotation and scale
		tween(birdGraphics, {
			rotation: -0.3,
			scaleY: 1.1
		}, {
			duration: 150
		});
		tween(birdGraphics, {
			rotation: 0.3,
			scaleY: 1
		}, {
			duration: 300
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocityY += self.gravity;
		// Limit fall speed
		if (self.velocityY > self.maxFallSpeed) {
			self.velocityY = self.maxFallSpeed;
		}
		// Update position
		self.y += self.velocityY;
		// Rotate bird based on velocity
		if (self.velocityY < 0) {
			birdGraphics.rotation = Math.max(-0.5, self.velocityY * 0.05);
		} else {
			birdGraphics.rotation = Math.min(0.8, self.velocityY * 0.05);
		}
	};
	return self;
});
var Pipe = Container.expand(function (gapY) {
	var self = Container.call(this);
	self.gapSize = 300;
	self.speed = 4;
	self.scored = false;
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	topPipe.y = gapY - self.gapSize / 2;
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	bottomPipe.y = gapY + self.gapSize / 2;
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var ground;
var gameStarted = false;
var gameSpeed = 4;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 90; // frames between pipe spawns
// Create score display
var scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100;
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366;
// Create first pipe
function createPipe() {
	var gapY = Math.random() * (2200 - 400) + 400; // Random gap position
	var pipe = new Pipe(gapY);
	pipe.x = 2048 + 60;
	pipes.push(pipe);
	game.addChild(pipe);
}
// Initial pipe
createPipe();
game.down = function (x, y, obj) {
	if (!gameStarted) {
		gameStarted = true;
	}
	bird.flap();
};
game.update = function () {
	if (!gameStarted) return;
	// Spawn new pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		createPipe();
		pipeSpawnTimer = 0;
	}
	// Update and check pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		// Check if pipe has moved off screen
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Check collision with bird
		if (bird.intersects(pipe)) {
			LK.getSound('hit').play();
			LK.showGameOver();
			return;
		}
		// Check scoring
		if (!pipe.scored && pipe.x + 60 < bird.x) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	}
	// Check ground collision
	if (bird.y + 22 > ground.y) {
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
	// Check ceiling collision
	if (bird.y - 22 < 0) {
		LK.getSound('hit').play();
		LK.showGameOver();
		return;
	}
};