/**** 
* 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.flapStrength = -12;
	self.update = function () {
		self.velocity += self.gravity;
		self.y += self.velocity;
		// Rotate bird based on velocity
		birdGraphics.rotation = Math.max(-0.5, Math.min(0.5, self.velocity * 0.05));
		// Check ground collision
		if (self.y > gameHeight - groundHeight - 30) {
			gameOver();
		}
		// Check ceiling collision
		if (self.y < 30) {
			gameOver();
		}
	};
	self.flap = function () {
		self.velocity = self.flapStrength;
		LK.getSound('flap').play();
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.speed = -4;
	self.gapSize = 450;
	self.scored = false;
	self.setupPipes = function (gapY) {
		// Position top pipe so it extends from top of screen to gap start
		topPipe.y = gapY - self.gapSize / 2;
		// Position bottom pipe so it extends from gap end to ground
		bottomPipe.y = gapY + self.gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
		// Check if pipe has passed bird and award score
		if (!self.scored && self.x < bird.x) {
			self.scored = true;
			score++;
			scoreTxt.setText(score);
			LK.setScore(score);
		}
		// Remove pipe when off screen
		if (self.x < -100) {
			self.destroy();
			for (var i = pipes.length - 1; i >= 0; i--) {
				if (pipes[i] === self) {
					pipes.splice(i, 1);
					break;
				}
			}
		}
	};
	self.checkCollision = function (birdObj) {
		var birdBounds = {
			left: birdObj.x - 30,
			right: birdObj.x + 30,
			top: birdObj.y - 25,
			bottom: birdObj.y + 25
		};
		var topPipeBounds = {
			left: self.x - 60,
			right: self.x + 60,
			top: 0,
			bottom: topPipe.y
		};
		var bottomPipeBounds = {
			left: self.x - 60,
			right: self.x + 60,
			top: bottomPipe.y,
			bottom: gameHeight
		};
		// Check collision with top pipe
		if (birdBounds.right > topPipeBounds.left && birdBounds.left < topPipeBounds.right && birdBounds.top < topPipeBounds.bottom) {
			return true;
		}
		// Check collision with bottom pipe
		if (birdBounds.right > bottomPipeBounds.left && birdBounds.left < bottomPipeBounds.right && birdBounds.bottom > bottomPipeBounds.top) {
			return true;
		}
		return false;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var gameWidth = 2048;
var gameHeight = 2732;
var groundHeight = 100;
var bird;
var pipes = [];
var score = 0;
var gameRunning = true;
var pipeSpawnTimer = 0;
var difficultyTimer = 0;
// Create ground
var ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: gameHeight - groundHeight
}));
// Create bird
bird = game.addChild(new Bird());
bird.x = 300;
bird.y = gameHeight / 2;
// Create score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
function spawnPipe() {
	var pipe = new Pipe();
	pipe.x = gameWidth + 100;
	// Random gap position (avoid too high or too low)
	var minGapY = 200;
	var maxGapY = gameHeight - groundHeight - 200;
	var gapY = minGapY + Math.random() * (maxGapY - minGapY);
	pipe.setupPipes(gapY);
	pipes.push(pipe);
	game.addChild(pipe);
}
function gameOver() {
	if (!gameRunning) return;
	gameRunning = false;
	LK.effects.flashScreen(0xff0000, 1000);
	LK.showGameOver();
}
function increaseDifficulty() {
	// Increase pipe speed slightly
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].speed = Math.max(-8, pipes[i].speed - 0.1);
	}
	// Decrease gap size slightly for new pipes
	if (Pipe.prototype.gapSize > 200) {
		Pipe.prototype.gapSize -= 5;
	}
}
// Touch controls
game.down = function (x, y, obj) {
	if (gameRunning) {
		bird.flap();
	}
};
// Main game loop
game.update = function () {
	if (!gameRunning) return;
	// Spawn pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= 180) {
		// Spawn pipe every 3 seconds (180 frames at 60fps)
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Increase difficulty every 10 seconds
	difficultyTimer++;
	if (difficultyTimer >= 600) {
		// 10 seconds at 60fps
		increaseDifficulty();
		difficultyTimer = 0;
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		if (pipes[i].checkCollision(bird)) {
			gameOver();
			break;
		}
	}
};
// Start background music
LK.playMusic('bgmusic');