/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1");

/**** 
* Classes
****/ 
// Bird class
var Bird = Container.expand(function () {
	var self = Container.call(this);
	var birdSprite = self.attachAsset('bird', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var birdDrinkSprite = self.attachAsset('Bird_drink', {
		anchorX: 0.5,
		anchorY: 0.5,
		visible: false
	});
	var drink2Sprite = self.attachAsset('Drink_2', {
		anchorX: 0.5,
		anchorY: 0.5,
		visible: false
	});
	var drink3Sprite = self.attachAsset('Drink3', {
		anchorX: 0.5,
		anchorY: 0.5,
		visible: false
	});
	// Position drink in front of bird
	birdDrinkSprite.x = birdSprite.width * 0.7; // Offset to the right (in front)
	drink2Sprite.x = birdDrinkSprite.x; // Align drink2Sprite with birdDrinkSprite
	drink3Sprite.x = birdDrinkSprite.x; // Align drink3Sprite with birdDrinkSprite
	self.currentSprite = birdSprite;
	self.radius = birdSprite.width * 0.5 * 0.85; // for collision
	self.vy = 0; // vertical speed
	self.gravity = 0.6; // gravity per frame (slower fall)
	self.flapStrength = -22; // negative = up, less strong flap
	// Flap method
	self.flap = function () {
		self.vy = self.flapStrength;
		LK.getSound('flap').play();
	};
	// Toggle drink method
	self.toggleDrink = function () {
		// Cycle through no drink, bird drink, drink 2, and drink 3
		if (!birdDrinkSprite.visible && !drink2Sprite.visible && !drink3Sprite.visible) {
			birdDrinkSprite.visible = true;
			drink2Sprite.visible = false;
			drink3Sprite.visible = false;
		} else if (birdDrinkSprite.visible) {
			birdDrinkSprite.visible = false;
			drink2Sprite.visible = true;
			drink3Sprite.visible = false;
		} else if (drink2Sprite.visible) {
			birdDrinkSprite.visible = false;
			drink2Sprite.visible = false;
			drink3Sprite.visible = true;
		} else {
			birdDrinkSprite.visible = false;
			drink2Sprite.visible = false;
			drink3Sprite.visible = false;
		}
		// Save the current drink state to storage
		storage.lastDrink = birdDrinkSprite.visible ? 1 : drink2Sprite.visible ? 2 : 0;
	};
	// Update method
	self.update = function () {
		self.vy += self.gravity * (slowTimeActive ? slowTimeMultiplier : 1);
		self.y += self.vy;
		// Rotate bird based on velocity (visual only)
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 6;
		var angle = self.vy / 40 * maxAngle;
		if (angle > maxAngle) angle = maxAngle;
		if (angle < minAngle) angle = minAngle;
		birdSprite.rotation = angle;
		// Keep drink upright and in front
		birdDrinkSprite.rotation = 0;
	};
	return self;
});
// Fire class for standalone fire effects
var Fire = Container.expand(function () {
	var self = Container.call(this);
	var fireSprite = self.attachAsset('fire', {
		anchorX: 0.5,
		anchorY: 0.5,
		visible: false,
		alpha: 0.5
	});
	self.shootFire = function () {
		fireSprite.visible = true;
		fireSprite.x = 0; // Reset position when shooting
		fireSprite.y = 0;
		tween(fireSprite, {
			alpha: 1
		}, {
			duration: 500,
			easing: tween.linear,
			onFinish: function onFinish() {
				tween(fireSprite, {
					alpha: 0.5
				}, {
					duration: 500,
					easing: tween.linear
				});
			}
		});
	};
	self.getBoundingRect = function () {
		if (!fireSprite.visible) return null;
		return {
			x: self.x + fireSprite.x - fireSprite.width * 0.5,
			y: self.y + fireSprite.y - fireSprite.height * 0.5,
			width: fireSprite.width,
			height: fireSprite.height
		};
	};
	self.update = function () {
		if (fireSprite.visible) {
			fireSprite.x -= pipeSpeed;
			if (fireSprite.x < -fireSprite.width) {
				fireSprite.visible = false;
			}
		}
	};
	return self;
});
var FirePipe = Container.expand(function () {
	var self = Container.call(this);
	var firePipeSprite = self.attachAsset('FirePipe', {
		anchorX: 0.5,
		anchorY: 0.5,
		visible: true,
		alpha: 1
	});
	self.movingRight = true; // Track movement direction
	self.startMovement = function () {
		// Start continuous left-right movement
		self.moveLeftRight();
	};
	self.moveLeftRight = function () {
		// Check if this pipe is frozen
		if (self.frozen) return;
		var targetX = self.movingRight ? 300 : -300; // Move 300px in each direction
		tween(firePipeSprite, {
			x: targetX
		}, {
			duration: 2000,
			// 2 seconds to move in one direction
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				// Reverse direction and continue moving
				self.movingRight = !self.movingRight;
				self.moveLeftRight();
			}
		});
	};
	self.freeze = function () {
		self.frozen = true;
		// Add visual effect for frozen state
		tween(firePipeSprite, {
			tint: 0x88ccff
		}, {
			duration: 300,
			easing: tween.easeOut
		});
	};
	self.unfreeze = function () {
		self.frozen = false;
		// Remove visual effect
		tween(firePipeSprite, {
			tint: 0xffffff
		}, {
			duration: 300,
			easing: tween.easeOut
		});
		// Resume movement
		self.moveLeftRight();
	};
	self.getBoundingRect = function () {
		if (!firePipeSprite.visible) return null;
		return {
			x: self.x + firePipeSprite.x - firePipeSprite.width * 0.5,
			y: self.y + firePipeSprite.y - firePipeSprite.height * 0.5,
			width: firePipeSprite.width,
			height: firePipeSprite.height
		};
	};
	self.update = function () {
		// Movement is now handled by tween
	};
	return self;
});
// PipePair class (top and bottom pipes)
var PipePair = Container.expand(function () {
	var self = Container.call(this);
	// Pipe config
	var pipeWidth = 200;
	var pipeHeight = 1200;
	var gapHeight = 480; // vertical gap between pipes
	// Randomly decide if pipes are flipped (top/bottom swap orientation)
	var flip = Math.random() < 0.5;
	// Randomly decide pipe type: normal (70%) or fire (30%)
	var isFirePipe = Math.random() < 0.3;
	// For fire pipes, always single pipe. For regular pipes, 30% chance of single pipe
	var isSinglePipe = isFirePipe || Math.random() < 0.3;
	var pipeAsset = isFirePipe ? 'FirePipe' : 'pipe';
	var topPipe = null;
	var bottomPipe = null;
	// Create pipes based on configuration
	if (isSinglePipe) {
		// Single pipe - randomly choose top or bottom position
		var isTopPosition = Math.random() < 0.5;
		if (isTopPosition) {
			topPipe = self.attachAsset(pipeAsset, {
				anchorX: 0,
				anchorY: flip ? 0 : 1,
				width: pipeWidth,
				height: pipeHeight,
				rotation: flip ? Math.PI : 0
			});
		} else {
			bottomPipe = self.attachAsset(pipeAsset, {
				anchorX: 0,
				anchorY: flip ? 1 : 0,
				width: pipeWidth,
				height: pipeHeight,
				rotation: flip ? Math.PI : 0
			});
		}
	} else {
		// Double pipes (traditional setup)
		topPipe = self.attachAsset(pipeAsset, {
			anchorX: 0,
			anchorY: flip ? 0 : 1,
			width: pipeWidth,
			height: pipeHeight,
			rotation: flip ? Math.PI : 0
		});
		bottomPipe = self.attachAsset(pipeAsset, {
			anchorX: 0,
			anchorY: flip ? 1 : 0,
			width: pipeWidth,
			height: pipeHeight,
			rotation: flip ? Math.PI : 0
		});
	}
	self.pipeWidth = pipeWidth;
	self.gapHeight = gapHeight;
	self.passed = false; // for scoring
	self.isFirePipe = isFirePipe;
	self.isSinglePipe = isSinglePipe;
	self.fireTimer = 0;
	self.topPipe = topPipe;
	self.bottomPipe = bottomPipe;
	// Set pipes' vertical positions based on gapY (top of gap)
	self.setGap = function (gapY) {
		// gapY: y position of top of gap
		if (topPipe) topPipe.y = gapY;
		if (bottomPipe) bottomPipe.y = gapY + gapHeight;
	};
	// Move pipes left
	self.update = function () {
		self.x -= pipeSpeed;
	};
	// Get bounding rects for collision
	self.getTopRect = function () {
		if (!topPipe) return null;
		return {
			x: self.x,
			y: topPipe.y - pipeHeight,
			width: pipeWidth,
			height: pipeHeight
		};
	};
	self.getBottomRect = function () {
		if (!bottomPipe) return null;
		return {
			x: self.x,
			y: bottomPipe.y,
			width: pipeWidth,
			height: pipeHeight
		};
	};
	// Add fire shooting capability for fire pipes
	if (isFirePipe) {
		var firePipe = new FirePipe();
		self.addChild(firePipe);
		self.firePipe = firePipe;
		self.fireStarted = false; // Track if fire has been started
	}
	self.update = function () {
		self.x -= pipeSpeed * (slowTimeActive ? slowTimeMultiplier : 1);
		// Update fire pipe if this is a fire pipe
		if (self.isFirePipe && self.firePipe) {
			self.firePipe.x = self.x; // Position fire at pipe position
			// Center fire in the gap or at pipe level for single pipes
			var fireY = bottomPipe ? bottomPipe.y - gapHeight / 2 : topPipe ? topPipe.y + gapHeight / 2 : 1366;
			self.firePipe.y = fireY;
			self.firePipe.update();
			// Start movement when pipe enters screen (only once)
			if (!self.fireStarted && self.x < 2048) {
				self.fireStarted = true;
				// Check if power-up is active and freeze immediately
				if (slowTimeActive) {
					self.firePipe.freeze();
					frozenPipes.push(self.firePipe);
				} else {
					self.firePipe.startMovement();
				}
			}
		}
	};
	return self;
});
// PowerUp class
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	// Create a star-shaped power-up visual using new asset
	var powerUpSprite = self.attachAsset('powerUpStar', {
		anchorX: 0.5,
		anchorY: 0.5,
		tint: 0x00ffff // Cyan color for freeze power-up
	});
	// Add pulsing effect
	self.pulse = function () {
		tween(powerUpSprite, {
			scaleX: 1.2,
			scaleY: 1.2
		}, {
			duration: 500,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(powerUpSprite, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 500,
					easing: tween.easeInOut,
					onFinish: function onFinish() {
						self.pulse();
					}
				});
			}
		});
	};
	self.collected = false;
	self.update = function () {
		if (!self.collected) {
			self.x -= pipeSpeed * (slowTimeActive ? slowTimeMultiplier : 1);
		}
	};
	self.getBoundingRect = function () {
		return {
			x: self.x - powerUpSprite.width * 0.5,
			y: self.y - powerUpSprite.height * 0.5,
			width: powerUpSprite.width,
			height: powerUpSprite.height
		};
	};
	// Start pulsing animation
	self.pulse();
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87ceeb // sky blue
});

/**** 
* Game Code
****/ 
// Sound: Hit
// Sound: Score
// Sound: Flap
// Ground: brown box
// Pipe: green box
// Bird: yellow ellipse
// Game constants
var BIRD_START_X = 600;
var BIRD_START_Y = 1200;
var PIPE_INTERVAL = 1300; // px between pipes horizontally (slower spawn rate)
var PIPE_MIN_Y = 350; // min y for top of gap
var PIPE_MAX_Y = 1800; // max y for top of gap
var GROUND_Y = 2732 - 120; // ground top y
var pipeSpeed = 8; // px per frame (slower pipes)
var POWERUP_DURATION = 30000; // 30 seconds in milliseconds
var slowTimeMultiplier = 0.3; // 30% speed during slow time
// Game state
var bird;
var pipes = [];
var powerUps = [];
var ground;
var score = 0;
var scoreTxt;
var gameOver = false;
var started = false;
var lastPipeX = 0;
var slowTimeActive = false;
var slowTimeTimer = null;
var frozenPipes = [];
// GUI: Score
scoreTxt = new Text2('0', {
	size: 160,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// GUI: Game Over text
var gameOverTxt = new Text2('Game Over', {
	size: 180,
	fill: 0xFF4444
});
gameOverTxt.anchor.set(0.5, 0.5);
gameOverTxt.visible = false;
LK.gui.center.addChild(gameOverTxt);
// GUI: Tap to restart
var restartTxt = new Text2('Tap to restart', {
	size: 100,
	fill: 0xFFFFFF
});
restartTxt.anchor.set(0.5, 0.5);
restartTxt.visible = false;
LK.gui.center.addChild(restartTxt);
// GUI: Drink toggle button
var drinkToggleBtn = new Container();
var drinkBtnBg = drinkToggleBtn.attachAsset('centerCircle', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: 150,
	height: 150,
	tint: 0x4444ff
});
var drinkBtnText = new Text2('🥤', {
	size: 80,
	fill: 0xFFFFFF
});
drinkBtnText.anchor.set(0.5, 0.5);
drinkToggleBtn.addChild(drinkBtnText);
drinkToggleBtn.x = -100;
drinkToggleBtn.y = 100;
LK.gui.topRight.addChild(drinkToggleBtn);
// GUI: Reset score button
var resetScoreBtn = new Container();
var resetBtnBg = resetScoreBtn.attachAsset('centerCircle', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: 150,
	height: 150,
	tint: 0xff4444
});
var resetBtnText = new Text2('Ø', {
	size: 100,
	fill: 0xFFFFFF
});
resetBtnText.anchor.set(0.5, 0.5);
resetScoreBtn.addChild(resetBtnText);
resetScoreBtn.x = -100;
resetScoreBtn.y = 280;
LK.gui.topRight.addChild(resetScoreBtn);
// GUI: Bird swapper button
var birdSwapBtn = new Container();
var birdSwapBtnBg = birdSwapBtn.attachAsset('centerCircle', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: 150,
	height: 150,
	tint: 0x44ff44
});
var birdSwapIcon = birdSwapBtn.attachAsset('bird', {
	anchorX: 0.5,
	anchorY: 0.5,
	scaleX: 0.8,
	scaleY: 0.8
});
birdSwapBtn.x = -100;
birdSwapBtn.y = 460;
LK.gui.topRight.addChild(birdSwapBtn);
// Start spinning animation for reset button
function spinResetButton() {
	tween(resetBtnText, {
		rotation: resetBtnText.rotation + Math.PI * 2
	}, {
		duration: 2000,
		easing: tween.linear,
		onFinish: function onFinish() {
			spinResetButton();
		}
	});
}
spinResetButton();
// GUI: Power-up indicator
var powerUpIndicator = new Container();
var powerUpBg = powerUpIndicator.attachAsset('centerCircle', {
	anchorX: 0.5,
	anchorY: 0.5,
	width: 200,
	height: 80,
	tint: 0x00ffff
});
var powerUpText = new Text2('FREEZE: 30s', {
	size: 40,
	fill: 0xFFFFFF
});
powerUpText.anchor.set(0.5, 0.5);
powerUpIndicator.addChild(powerUpText);
powerUpIndicator.x = 0;
powerUpIndicator.y = 200;
powerUpIndicator.visible = false;
LK.gui.top.addChild(powerUpIndicator);
// Drink toggle handler
drinkToggleBtn.down = function () {
	if (bird) {
		bird.toggleDrink();
	}
};
// Reset score handler
resetScoreBtn.down = function () {
	score = 0;
	scoreTxt.setText('0');
	storage.lastScore = 0;
	// Flash effect to indicate reset
	LK.effects.flashObject(resetScoreBtn, 0xffffff, 300);
};
// Bird swap handler
birdSwapBtn.down = function () {
	if (bird) {
		// Get current bird type from storage or default to 'bird'
		var currentBirdType = storage.currentBirdType || 'bird';
		var newBirdType = currentBirdType === 'bird' ? 'Bird2' : 'bird';
		// Store current drink state
		var drinkState = {
			drink1: bird.children[1].visible,
			drink2: bird.children[2].visible,
			drink3: bird.children[3].visible
		};
		// Remove current main bird sprite
		var currentBird = bird.children[0];
		bird.removeChild(currentBird);
		// Create new bird sprite
		var newBird = LK.getAsset(newBirdType, {
			anchorX: 0.5,
			anchorY: 0.5
		});
		bird.addChildAt(newBird, 0);
		bird.currentSprite = newBird;
		// Update rotation to match current velocity
		var maxAngle = Math.PI / 4;
		var minAngle = -Math.PI / 6;
		var angle = bird.vy / 40 * maxAngle;
		if (angle > maxAngle) angle = maxAngle;
		if (angle < minAngle) angle = minAngle;
		newBird.rotation = angle;
		// Restore drink state
		bird.children[1].visible = drinkState.drink1;
		bird.children[2].visible = drinkState.drink2;
		bird.children[3].visible = drinkState.drink3;
		// Save new bird type
		storage.currentBirdType = newBirdType;
		// Flash effect to indicate swap
		LK.effects.flashObject(birdSwapBtn, 0xffffff, 300);
	}
};
// Add ground
ground = LK.getAsset('ground', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: GROUND_Y
});
game.addChild(ground);
// Helper: Reset game state
function resetGame() {
	// Remove pipes
	for (var i = 0; i < pipes.length; i++) {
		pipes[i].destroy();
	}
	pipes = [];
	// Remove power-ups
	for (var i = 0; i < powerUps.length; i++) {
		powerUps[i].destroy();
	}
	powerUps = [];
	// Clear power-up state
	if (slowTimeTimer) {
		LK.clearTimeout(slowTimeTimer);
		slowTimeTimer = null;
	}
	slowTimeActive = false;
	powerUpIndicator.visible = false;
	frozenPipes = [];
	// Remove bird if exists
	if (bird) bird.destroy();
	// Reset variables
	score = 0;
	scoreTxt.setText('0');
	gameOver = false;
	started = false;
	lastPipeX = 0;
	// Hide game over
	gameOverTxt.visible = false;
	restartTxt.visible = false;
	// Add bird
	bird = new Bird();
	bird.x = BIRD_START_X;
	bird.y = BIRD_START_Y;
	game.addChild(bird);
	// Restore score if available
	if (typeof storage.lastScore !== "undefined") {
		score = storage.lastScore;
		scoreTxt.setText(score + '');
	}
	// Restore bird type if available
	if (typeof storage.currentBirdType !== "undefined" && storage.currentBirdType === 'Bird2') {
		var currentBird = bird.children[0];
		var newBird = LK.getAsset('Bird2', {
			anchorX: 0.5,
			anchorY: 0.5
		});
		bird.removeChild(currentBird);
		bird.addChildAt(newBird, 0);
		bird.currentSprite = newBird;
	}
	// Restore drink state if available
	if (typeof storage.lastDrink !== "undefined") {
		if (storage.lastDrink === 1) {
			bird.children[1].visible = true;
			bird.children[2].visible = false;
		} else if (storage.lastDrink === 2) {
			bird.children[1].visible = false;
			bird.children[2].visible = true;
		} else if (storage.lastDrink === 3) {
			bird.children[1].visible = false;
			bird.children[2].visible = false;
			bird.children[3].visible = true;
		} else {
			bird.children[1].visible = false;
			bird.children[2].visible = false;
			bird.children[3].visible = false;
		}
	}
	// Add first pipes
	for (var i = 0; i < 3; i++) {
		spawnPipe(2048 + i * PIPE_INTERVAL);
	}
}
// Helper: Spawn a pipe pair at x
function spawnPipe(x) {
	var gapY = PIPE_MIN_Y + Math.floor(Math.random() * (PIPE_MAX_Y - PIPE_MIN_Y));
	var pipePair = new PipePair();
	pipePair.x = x;
	pipePair.setGap(gapY);
	pipes.push(pipePair);
	game.addChild(pipePair);
	lastPipeX = x;
	// 10% chance to spawn power-up with pipe
	if (Math.random() < 0.1 && !slowTimeActive) {
		var powerUp = new PowerUp();
		powerUp.x = x + pipePair.pipeWidth / 2;
		powerUp.y = gapY + pipePair.gapHeight / 2;
		powerUps.push(powerUp);
		game.addChild(powerUp);
	}
}
// Helper: Check collision between bird and a pipe rect
function birdHitsRect(rect) {
	// Return false if rect is null (e.g., when fire sprite is not visible)
	if (!rect) return false;
	// Bird is a circle, rect is {x, y, width, height}
	var cx = bird.x;
	var cy = bird.y;
	var r = bird.radius;
	// Find closest point in rect to bird center
	var closestX = cx;
	if (cx < rect.x) closestX = rect.x;else if (cx > rect.x + rect.width) closestX = rect.x + rect.width;
	var closestY = cy;
	if (cy < rect.y) closestY = rect.y;else if (cy > rect.y + rect.height) closestY = rect.y + rect.height;
	var dx = cx - closestX;
	var dy = cy - closestY;
	return dx * dx + dy * dy < r * r;
}
// Helper: Activate power-up
function activatePowerUp() {
	slowTimeActive = true;
	powerUpIndicator.visible = true;
	// Freeze all fire pipes
	for (var i = 0; i < pipes.length; i++) {
		if (pipes[i].isFirePipe && pipes[i].firePipe) {
			pipes[i].firePipe.freeze();
			frozenPipes.push(pipes[i].firePipe);
		}
	}
	// Start countdown
	var timeLeft = POWERUP_DURATION / 1000;
	var countdownInterval = LK.setInterval(function () {
		timeLeft--;
		powerUpText.setText('FREEZE: ' + timeLeft + 's');
		if (timeLeft <= 0) {
			LK.clearInterval(countdownInterval);
		}
	}, 1000);
	// Set timer to deactivate power-up
	if (slowTimeTimer) {
		LK.clearTimeout(slowTimeTimer);
	}
	slowTimeTimer = LK.setTimeout(function () {
		slowTimeActive = false;
		powerUpIndicator.visible = false;
		// Unfreeze all frozen pipes
		for (var i = 0; i < frozenPipes.length; i++) {
			frozenPipes[i].unfreeze();
		}
		frozenPipes = [];
		LK.clearInterval(countdownInterval);
	}, POWERUP_DURATION);
}
// Helper: End game
function triggerGameOver() {
	if (gameOver) return;
	gameOver = true;
	// Save score and drink state to storage
	storage.lastScore = score;
	// Access birdDrinkSprite via bird instance if available
	storage.lastDrink = bird && bird.hasOwnProperty('children') && bird.children.length > 1 ? bird.children[1].visible ? 1 : bird.children[2].visible ? 2 : bird.children[3].visible ? 3 : 0 : 0;
	LK.getSound('hit').play();
	gameOverTxt.visible = true;
	restartTxt.visible = true;
	// Flash screen
	LK.effects.flashScreen(0xff0000, 600);
	// Show Game Over popup (will pause game)
	// LK.showGameOver();
}
// Game tap/flap handler
function handleTap(x, y, obj) {
	if (gameOver) {
		resetGame();
		return;
	}
	if (!started) {
		started = true;
	}
	bird.flap();
}
// Attach tap handler
game.down = handleTap;
// Main update loop
game.update = function () {
	if (gameOver) return;
	// Bird update
	bird.update();
	// Pipes update
	for (var i = pipes.length - 1; i >= 0; i--) {
		var pipe = pipes[i];
		pipe.update();
		// Remove pipes off screen
		if (pipe.x + pipe.pipeWidth < 0) {
			pipe.destroy();
			pipes.splice(i, 1);
			continue;
		}
		// Scoring: passed pipe
		if (!pipe.passed && pipe.x + pipe.pipeWidth < bird.x) {
			pipe.passed = true;
			score += 1;
			scoreTxt.setText(score + '');
			LK.getSound('score').play();
		}
	}
	// Spawn new pipes
	if (pipes.length > 0) {
		var rightmost = pipes[pipes.length - 1];
		if (2048 - (rightmost.x + rightmost.pipeWidth) >= PIPE_INTERVAL - 10) {
			spawnPipe(2048);
		}
	}
	// Power-ups update and collision
	for (var i = powerUps.length - 1; i >= 0; i--) {
		var powerUp = powerUps[i];
		powerUp.update();
		// Remove power-ups off screen
		if (powerUp.x + 40 < 0) {
			powerUp.destroy();
			powerUps.splice(i, 1);
			continue;
		}
		// Check collision with bird
		if (!powerUp.collected && birdHitsRect(powerUp.getBoundingRect())) {
			powerUp.collected = true;
			powerUp.visible = false;
			activatePowerUp();
			LK.getSound('score').play();
		}
	}
	// Collision: pipes
	for (var i = 0; i < pipes.length; i++) {
		var pipe = pipes[i];
		var hitTopPipe = birdHitsRect(pipe.getTopRect());
		var hitBottomPipe = birdHitsRect(pipe.getBottomRect());
		var hitPipe = hitTopPipe || hitBottomPipe;
		var hitFire = pipe.isFirePipe && pipe.firePipe && pipe.firePipe.getBoundingRect && birdHitsRect(pipe.firePipe.getBoundingRect());
		if (hitPipe || hitFire) {
			triggerGameOver();
			return;
		}
	}
	// Collision: ground
	if (bird.y + bird.radius > GROUND_Y) {
		bird.y = GROUND_Y - bird.radius;
		triggerGameOver();
		return;
	}
	// Collision: ceiling
	if (bird.y - bird.radius < 0) {
		bird.y = bird.radius;
		bird.vy = 0;
	}
	// Out of bounds (left/right)
	if (bird.x - bird.radius < 0 || bird.x + bird.radius > 2048) {
		triggerGameOver();
		return;
	}
};
// Initial game state
resetGame();