/**** 
* 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 = 0.3;
	self.flapPower = -12;
	self.maxFallSpeed = 15;
	self.flap = function () {
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Add a small rotation animation when flapping
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 150
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 300
		});
	};
	self.update = function () {
		self.velocity += self.gravity;
		if (self.velocity > self.maxFallSpeed) {
			self.velocity = self.maxFallSpeed;
		}
		self.y += self.velocity;
		// Rotate bird based on velocity
		birdGraphics.rotation = Math.max(-0.5, Math.min(0.5, self.velocity * 0.05));
	};
	return self;
});
var Ground = Container.expand(function () {
	var self = Container.call(this);
	var groundGraphics = self.attachAsset('ground', {
		anchorX: 0,
		anchorY: 0
	});
	self.speed = -4;
	self.update = function () {
		self.x += self.speed;
		// Reset position for infinite scrolling
		if (self.x <= -2048) {
			self.x = 0;
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	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.setup = function (gapY, gapSize) {
		self.topPipe.y = gapY - gapSize / 2;
		self.bottomPipe.y = gapY + gapSize / 2;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game constants
var PIPE_GAP_SIZE = 300;
var PIPE_SPACING = 400;
var GROUND_Y = 2632;
// Game variables
var bird;
var pipes = [];
var grounds = [];
var gameStarted = false;
var pipeSpawnTimer = 0;
// 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);
LK.gui.center.addChild(instructionTxt);
// Initialize bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366;
// Create ground segments for infinite scrolling
for (var i = 0; i < 2; i++) {
	var ground = game.addChild(new Ground());
	ground.x = i * 2048;
	ground.y = GROUND_Y;
	grounds.push(ground);
}
// Helper functions
function spawnPipe() {
	var pipe = new Pipe();
	var gapY = Math.random() * (GROUND_Y - 400 - PIPE_GAP_SIZE) + 200 + PIPE_GAP_SIZE / 2;
	pipe.x = 2048 + 60;
	pipe.setup(gapY, PIPE_GAP_SIZE);
	pipes.push(pipe);
	game.addChild(pipe);
}
function startGame() {
	gameStarted = true;
	instructionTxt.visible = false;
	bird.flap();
}
function checkCollisions() {
	// Check ground collision
	if (bird.y + 22 >= GROUND_Y) {
		return true;
	}
	// Check ceiling collision
	if (bird.y - 22 <= 0) {
		return true;
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		var pipeLeft = pipe.x - 60;
		var pipeRight = pipe.x + 60;
		var birdLeft = bird.x - 30;
		var birdRight = bird.x + 30;
		var birdTop = bird.y - 22;
		var birdBottom = bird.y + 22;
		// Check if bird is within pipe's x range
		if (birdRight > pipeLeft && birdLeft < pipeRight) {
			// Check top pipe collision
			if (birdTop < pipe.topPipe.y) {
				return true;
			}
			// Check bottom pipe collision
			if (birdBottom > pipe.bottomPipe.y) {
				return true;
			}
		}
		// Check for scoring
		if (!pipe.scored && bird.x > pipe.x) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	}
	return false;
}
// Event handlers
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
	} else {
		bird.flap();
	}
};
// Main game loop
game.update = function () {
	if (!gameStarted) {
		return;
	}
	// Update bird
	bird.update();
	// Update ground
	for (var i = 0; i < grounds.length; i++) {
		grounds[i].update();
	}
	// Update pipes
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove pipes that are off-screen
		if (pipe.x < -150) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
	// Spawn new pipes
	pipeSpawnTimer++;
	if (pipeSpawnTimer >= 100) {
		// Spawn every ~1.67 seconds at 60fps
		spawnPipe();
		pipeSpawnTimer = 0;
	}
	// Check collisions
	if (checkCollisions()) {
		LK.getSound('hit').play();
		LK.showGameOver();
	}
};