/**** 
* 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 = 1.2;
	self.flapStrength = -24;
	self.isAlive = true;
	self.flap = function () {
		if (self.isAlive) {
			self.velocityY = self.flapStrength;
			LK.getSound('flap').play();
			// Add flap animation
			tween(birdGraphics, {
				rotation: -0.3
			}, {
				duration: 150
			});
			tween(birdGraphics, {
				rotation: 0.3
			}, {
				duration: 300,
				onFinish: function onFinish() {
					tween(birdGraphics, {
						rotation: 0
					}, {
						duration: 200
					});
				}
			});
		}
	};
	self.update = function () {
		if (self.isAlive) {
			self.velocityY += self.gravity;
			self.y += self.velocityY;
			// Rotate bird based on velocity
			var targetRotation = Math.max(-0.5, Math.min(0.8, self.velocityY * 0.1));
			birdGraphics.rotation = targetRotation;
			// Check bounds
			if (self.y < 0 || self.y > 2632) {
				// 2732 - 100 (ground height)
				self.die();
			}
		}
	};
	self.die = function () {
		if (self.isAlive) {
			self.isAlive = false;
			LK.showGameOver();
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -8;
	self.scored = false;
	self.gapSize = 520;
	// 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;
		// Extend top pipe to ceiling
		var topPipeTop = gapCenterY - self.gapSize / 2;
		var distanceToCeiling = topPipeTop; // Distance from top of screen (0) to top pipe
		self.topPipe.height = 800 + distanceToCeiling;
		// Extend bottom pipe to ground level
		var bottomPipeBottom = gapCenterY + self.gapSize / 2;
		var distanceToGround = 2632 - bottomPipeBottom; // 2632 is ground y position
		self.bottomPipe.height = 800 + distanceToGround;
	};
	self.update = function () {
		self.x += self.speed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
// Game variables
var bird;
var pipes = [];
var ground;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 280; // frames between pipe spawns
var gameStarted = false;
// Create bird
bird = game.addChild(new Bird());
bird.x = 400;
bird.y = 1366; // Center of screen
// Create ground (after bird so it renders on top)
ground = game.addChild(LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2632
}));
// Create score display
var scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
scoreTxt.y = 150; // Move down from top edge
// Create tap to start text
var instructionTxt = new Text2('TAP TO FLY', {
	size: 80,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionTxt);
function spawnPipe() {
	var pipe = new Pipe();
	var gapCenterY = 400 + Math.random() * 1800; // Random gap position
	pipe.setupPipes(gapCenterY);
	pipe.x = 2200; // Start off-screen right
	pipes.push(pipe);
	game.addChild(pipe);
}
function checkCollisions() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check collision with top and bottom pipes
		if (bird.intersects(pipe.topPipe) || bird.intersects(pipe.bottomPipe)) {
			bird.die();
			return;
		}
		// Check if bird passed pipe for 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 for win condition
			if (LK.getScore() >= 50) {
				LK.showYouWin();
			}
		}
	}
	// Check collision with ground
	if (bird.intersects(ground)) {
		bird.die();
	}
}
function startGame() {
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
	}
}
// Game input
game.down = function (x, y, obj) {
	if (!gameStarted) {
		startGame();
	}
	bird.flap();
};
// Main game loop
game.update = function () {
	if (gameStarted) {
		// Spawn pipes
		pipeSpawnTimer++;
		if (pipeSpawnTimer >= pipeSpawnInterval) {
			spawnPipe();
			pipeSpawnTimer = 0;
		}
		// Remove off-screen pipes
		for (var i = pipes.length - 1; i >= 0; i--) {
			var pipe = pipes[i];
			if (pipe.x < -200) {
				pipe.destroy();
				pipes.splice(i, 1);
			}
		}
		// Check collisions
		checkCollisions();
	}
};