/**** 
* 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.maxFallSpeed = 15;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Add a subtle flap animation
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 100
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 200
		});
	};
	self.update = function () {
		// Apply gravity
		self.velocity += self.gravity;
		// Limit fall speed
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		// Update position
		self.y += self.velocity;
		// Rotate bird based on velocity
		if (self.velocity < 0) {
			birdGraphics.rotation = Math.max(-0.5, self.velocity * 0.05);
		} else {
			birdGraphics.rotation = Math.min(1.2, self.velocity * 0.08);
		}
		// Check ground collision
		if (self.y > 2732 - 100 - 30) {
			// Ground height minus bird radius
			gameOver = true;
		}
		// Check ceiling collision
		if (self.y < 30) {
			gameOver = true;
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.gapSize = 300;
	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.setupPipes = function (gapCenterY) {
		self.topPipe.y = gapCenterY - self.gapSize / 2;
		self.bottomPipe.y = gapCenterY + self.gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
		// Check if bird passed through this pipe
		if (!self.scored && self.x < bird.x - 60) {
			self.scored = true;
			score++;
			LK.setScore(score);
			scoreTxt.setText(score);
			LK.getSound('score').play();
		}
	};
	self.checkCollision = function (birdObj) {
		var birdBounds = {
			x: birdObj.x - 25,
			y: birdObj.y - 25,
			width: 50,
			height: 50
		};
		var topPipeBounds = {
			x: self.x - 60,
			y: 0,
			width: 120,
			height: self.topPipe.y
		};
		var bottomPipeBounds = {
			x: self.x - 60,
			y: self.bottomPipe.y,
			width: 120,
			height: 2732 - self.bottomPipe.y
		};
		return self.intersectsBounds(birdBounds, topPipeBounds) || self.intersectsBounds(birdBounds, bottomPipeBounds);
	};
	self.intersectsBounds = function (rect1, rect2) {
		return rect1.x < rect2.x + rect2.width && rect1.x + rect1.width > rect2.x && rect1.y < rect2.y + rect2.height && rect1.y + rect1.height > rect2.y;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var ground;
var scoreTxt;
var score = 0;
var gameOver = false;
var gameStarted = false;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 120; // 2 seconds at 60fps
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366; // Center of screen
// Create ground
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0
}));
ground.x = 0;
ground.y = 2732 - 100;
// Create score text
scoreTxt = new Text2('0', {
	size: 80,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create instruction text
var instructionTxt = new Text2('TAP TO FLAP', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 2048 / 2;
instructionTxt.y = 1366 - 200;
game.addChild(instructionTxt);
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = 2048 + 60;
	// Random gap position (avoid too high or too low)
	var minGapCenter = 200 + pipe.gapSize / 2;
	var maxGapCenter = 2732 - 200 - pipe.gapSize / 2;
	var gapCenterY = minGapCenter + Math.random() * (maxGapCenter - minGapCenter);
	pipe.setupPipes(gapCenterY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function resetGame() {
	// Clear 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;
	// Reset score
	score = 0;
	LK.setScore(0);
	scoreTxt.setText('0');
	// Reset game state
	gameOver = false;
	gameStarted = false;
	pipeSpawnTimer = 0;
	// Show instruction text
	instructionTxt.visible = true;
}
game.down = function (x, y, obj) {
	if (gameOver) {
		LK.showGameOver();
		return;
	}
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
	}
	bird.flap();
};
game.update = function () {
	if (gameOver) {
		return;
	}
	if (!gameStarted) {
		return;
	}
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= pipeSpawnInterval) {
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Update pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		// Check collision
		if (pipe.checkCollision(bird)) {
			gameOver = true;
			LK.showGameOver();
			return;
		}
		// Remove pipes that are off screen
		if (pipe.x < -120) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
};