/**** 
* 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 = -8;
	self.flap = function () {
		// Calculate speed multiplier based on score (every 10 points)
		var speedMultiplier = 1 + Math.floor(LK.getScore() / 10) * 0.2;
		var adjustedFlapPower = self.flapPower * speedMultiplier;
		self.velocity = adjustedFlapPower;
		LK.getSound('flap').play();
		// Add flap animation
		tween(birdGraphics, {
			rotation: -0.3
		}, {
			duration: 100
		});
		tween(birdGraphics, {
			rotation: 0
		}, {
			duration: 200
		});
	};
	self.update = function () {
		// Calculate speed multiplier based on score (every 10 points)
		var speedMultiplier = 1 + Math.floor(LK.getScore() / 10) * 0.2;
		var adjustedGravity = self.gravity * speedMultiplier;
		var adjustedFlapPower = self.flapPower * speedMultiplier;
		self.velocity += adjustedGravity;
		// Add velocity damping to make bird more stable
		self.velocity *= 0.95;
		// Limit maximum fall speed (also increased with speed)
		self.velocity = Math.min(self.velocity, 8 * speedMultiplier);
		self.y += self.velocity;
		// Rotate bird based on velocity
		if (self.velocity > 0) {
			birdGraphics.rotation = Math.min(self.velocity * 0.05, 1.5);
		}
	};
	return self;
});
var Pipe = Container.expand(function () {
	var self = Container.call(this);
	self.speed = -4;
	self.gapSize = 300;
	self.scored = false;
	// Top pipe
	var topPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 1
	});
	// Bottom pipe
	var bottomPipe = self.attachAsset('pipe', {
		anchorX: 0.5,
		anchorY: 0
	});
	self.setupPipes = function (gapY) {
		topPipe.y = gapY - self.gapSize / 2;
		bottomPipe.y = gapY + self.gapSize / 2;
		// Extend top pipe to ceiling level
		topPipe.height = gapY - self.gapSize / 2;
		// Extend bottom pipe to ground level
		bottomPipe.height = 2632 - (gapY + self.gapSize / 2);
	};
	self.update = function () {
		// Calculate speed multiplier based on score (every 10 points)
		var speedMultiplier = 1 + Math.floor(LK.getScore() / 10) * 0.2;
		var adjustedSpeed = self.speed * speedMultiplier;
		self.x += adjustedSpeed;
	};
	return self;
});

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

/**** 
* Game Code
****/ 
var bird;
var pipes = [];
var ground;
var gameStarted = false;
var gameActive = true;
var pipeSpawnTimer = 0;
var pipeSpawnInterval = 120; // 2 seconds at 60fps
// Create score display
var 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 FLY', {
	size: 60,
	fill: 0xFFFFFF
});
instructionTxt.anchor.set(0.5, 0.5);
instructionTxt.x = 1024;
instructionTxt.y = 1000;
game.addChild(instructionTxt);
// Initialize 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 = 2632; // Bottom of screen
function spawnPipe() {
	var pipe = new Pipe();
	var gapY = 600 + Math.random() * 800; // Adjusted range to ensure bottom pipe reaches ground
	pipe.setupPipes(gapY);
	pipe.x = 2200; // Start off-screen right
	pipes.push(pipe);
	game.addChild(pipe);
}
function checkCollisions() {
	// Check ground collision
	if (bird.y + 50 >= ground.y) {
		return true;
	}
	// Check ceiling collision
	if (bird.y - 50 <= 0) {
		return true;
	}
	// Check pipe collisions
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		// Check if bird is within pipe x range
		if (bird.x + 50 > pipe.x - 60 && bird.x - 50 < pipe.x + 60) {
			// Check collision with top or bottom pipe
			if (bird.y - 50 < pipe.children[0].y || bird.y + 50 > pipe.children[1].y) {
				return true;
			}
		}
	}
	return false;
}
function updateScore() {
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		if (!pipe.scored && bird.x > pipe.x + 50) {
			pipe.scored = true;
			LK.setScore(LK.getScore() + 1);
			scoreTxt.setText(LK.getScore());
			LK.getSound('score').play();
		}
	}
}
function cleanupPipes() {
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		if (pipe.x < -200) {
			pipe.destroy();
			pipes.splice(i, 1);
		}
	}
}
game.down = function (x, y, obj) {
	if (!gameActive) return;
	if (!gameStarted) {
		gameStarted = true;
		instructionTxt.visible = false;
	}
	bird.flap();
};
game.update = function () {
	if (!gameActive) return;
	if (gameStarted) {
		// Update bird
		bird.update();
		// Spawn pipes
		pipeSpawnTimer++;
		if (pipeSpawnTimer >= pipeSpawnInterval) {
			spawnPipe();
			pipeSpawnTimer = 0;
		}
		// Update pipes
		for (var i = 0; i < pipes.length; i++) {
			pipes[i].update();
		}
		// Check collisions
		if (checkCollisions()) {
			gameActive = false;
			LK.showGameOver();
		}
		// Update score
		updateScore();
		// Cleanup off-screen pipes
		cleanupPipes();
	}
};