/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	highScore: 0
});

/**** 
* Classes
****/ 
var Cloud = Container.expand(function () {
	var self = Container.call(this);
	var cloudShape = self.attachAsset('cloud', {
		anchorX: 0.5,
		anchorY: 0.5,
		alpha: 0.8
	});
	self.speed = 0.5 + Math.random() * 0.5;
	self.update = function () {
		self.x -= self.speed;
		if (self.x < -cloudShape.width) {
			self.x = 2048 + cloudShape.width;
			self.y = 100 + Math.random() * 500;
		}
	};
	return self;
});
var FuelBar = Container.expand(function () {
	var self = Container.call(this);
	var frame = self.attachAsset('fuelBar', {
		anchorX: 1.0,
		anchorY: 0.0,
		tint: 0x000000 // Frame color
	});
	var bar = self.attachAsset('fuelBar', {
		anchorX: 1.0,
		anchorY: 0.0,
		tint: 0x00ff00 // Glowing fill effect
	});
	self.maxFuel = 100;
	self.currentFuel = self.maxFuel;
	self.depletionRate = 0.05; // Adjusted fuel depletion rate for fairness
	self.update = function () {
		if (self.currentFuel > 0) {
			// Adjust depletion rate based on score
			var dynamicDepletionRate = self.depletionRate + Math.min(0.05, score * 0.001);
			self.currentFuel -= dynamicDepletionRate;
			bar.scaleX = self.currentFuel / self.maxFuel;
			if (self.currentFuel < 25) {
				// Low fuel warning
				tween(bar, {
					tint: 0xff0000
				}, {
					duration: 500,
					easing: tween.easeInOut,
					onFinish: function onFinish() {
						tween(bar, {
							tint: 0x00ff00
						}, {
							duration: 500,
							easing: tween.easeInOut
						});
					}
				});
				if (!self.lowFuelSoundPlaying) {
					LK.getSound('lowFuelWarning').play();
					self.lowFuelSoundPlaying = true;
				}
			} else {
				self.lowFuelSoundPlaying = false;
			}
		} else {
			bird.die(); // Trigger game over if fuel is empty 
		}
	};
	self.refill = function (amount) {
		self.currentFuel = Math.min(self.currentFuel + amount, self.maxFuel);
	};
	var fuelIcon = self.attachAsset('fuelCollectible', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: -frame.width - 20,
		// Position next to the fuel bar
		y: frame.height / 2
	});
	return self;
});
var FuelCollectible = Container.expand(function (type) {
	var self = Container.call(this);
	self.type = type;
	var collectible = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= baseObstacleSpeed; // Move fuel tanks from right to left
		collectible.rotation -= 0.05; // Reverse slow spin
		collectible.alpha = 0.8 + 0.2 * Math.sin(LK.ticks * 0.1); // Light glow effect 
		if (self.x < -collectible.width) {
			self.destroy();
		}
	};
	self.speed = baseFuelSpeed; // Set fuel tank speed to match obstacles
	return self;
});
var Helicopter = Container.expand(function () {
	var self = Container.call(this);
	// Bird body
	var body = self.attachAsset('helicopter', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	// Bird properties
	self.velocity = 0;
	self.gravity = 0.5;
	self.flapPower = -12;
	self.rotation = 0;
	self.alive = true;
	self.flap = function () {
		if (!self.alive) {
			return;
		}
		self.velocity = self.flapPower;
		LK.getSound('flap').play();
		// Wing flap animation
		tween(self, {
			scaleY: 0.7
		}, {
			duration: 100,
			onFinish: function onFinish() {
				tween(self, {
					scaleY: 1
				}, {
					duration: 200
				});
			}
		});
	};
	self.update = function () {
		if (!self.alive) {
			return;
		}
		// Apply gravity or hold-to-fly mechanic
		if (self.holdFlying) {
			self.velocity = Math.max(self.velocity - 0.2, -5); // Slow rise when holding
		} else {
			self.velocity += self.gravity;
		}
		self.y += self.velocity;
		// Rotate based on velocity
		var targetRotation = self.velocity * 0.03;
		targetRotation = Math.max(Math.min(targetRotation, Math.PI / 4), -Math.PI / 4);
		self.rotation += (targetRotation - self.rotation) * 0.1;
		// Boundaries
		if (self.y < 0) {
			self.die(); // Trigger game over when the player goes off-screen at the top
		}
		if (self.y > 2732 - 250) {
			self.die();
		}
	};
	self.die = function () {
		if (!self.alive) {
			return;
		}
		self.alive = false;
		LK.getSound('hit').play();
		LK.effects.flashObject(self, 0xff0000, 500);
		// Death spin animation
		tween(self, {
			rotation: Math.PI,
			alpha: 0.7
		}, {
			duration: 1000,
			onFinish: function onFinish() {
				LK.showGameOver();
			}
		});
	};
	// Rotor blade animation
	var rotor = self.attachAsset('helicopterRotor', {
		anchorX: 0.5,
		anchorY: 0.5,
		x: 0,
		y: -body.height / 2
	});
	// Function to continuously rotate the rotor
	function rotateRotor() {
		tween(rotor, {
			rotation: rotor.rotation + Math.PI * 2
		}, {
			duration: 500,
			onFinish: rotateRotor
		});
	}
	// Start the rotor animation
	rotateRotor();
	return self;
});
var Obstacle = Container.expand(function (type) {
	var self = Container.call(this);
	// Gap between top and bottom obstacles
	// Top obstacle
	var topObstacle = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 1.0,
		y: 0
	});
	var bottomObstacle = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0,
		y: 0
	});
	self.speed = 3;
	self.passed = false;
	self.width = topObstacle.width;
	self.setGapSize = function (size) {
		bottomObstacle.y = topObstacle.y + size;
	};
	self.update = function () {
		self.x -= self.speed;
	};
	return self;
});
var PowerUp = Container.expand(function () {
	var self = Container.call(this);
	var powerUpAsset = self.attachAsset('powerUp', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.update = function () {
		self.x -= baseObstacleSpeed;
		if (self.x < -powerUpAsset.width) {
			self.destroy();
		}
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x87CEEB,
	title: 'Helicopter Trip'
});

/**** 
* Game Code
****/ 
// Game variables
var bird;
var obstacles = [];
var clouds = [];
var water;
var score = 0;
var highScore = storage.highScore || 0;
var baseObstacleSpeed = 3;
var baseFuelSpeed = baseObstacleSpeed; // Initialize fuel tank speed to match obstacles
var spawnInterval = 150;
var minGapSize = 400;
var gameStarted = false;
var scoreTxt;
var highScoreTxt;
var instructionsTxt;
// Initialize water (always at bottom of screen)
water = LK.getAsset('water', {
	anchorX: 0,
	anchorY: 0,
	x: 0,
	y: 2732 - 500
});
game.addChild(water);
// Initialize clouds
for (var i = 0; i < 5; i++) {
	var cloud = new Cloud();
	cloud.x = Math.random() * 2048;
	cloud.y = 100 + Math.random() * 500;
	clouds.push(cloud);
	game.addChild(cloud);
}
// Initialize bird
bird = new Helicopter();
bird.x = 400;
bird.y = 2732 / 2;
game.addChild(bird);
// Initialize fuel bar
var fuelBar = new FuelBar();
fuelBar.x = 2048 - 20; // Position at top-right corner
fuelBar.y = 20;
// Score text
scoreTxt = new Text2('0', {
	size: 120,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
scoreTxt.y = 50; // Move the score text slightly down
LK.gui.top.addChild(scoreTxt);
// Initialize fuel bar
var fuelBar = new FuelBar();
fuelBar.x = scoreTxt.x + scoreTxt.width / 2 + 60; // Increase space between the fuel bar and fuel tank
fuelBar.y = 20;
LK.gui.top.addChild(fuelBar);
// High score text
highScoreTxt = new Text2('Best: ' + highScore, {
	size: 60,
	fill: 0xFFFFFF
});
highScoreTxt.anchor.set(0.5, 0);
highScoreTxt.y = 180;
LK.gui.top.addChild(highScoreTxt);
// Instructions text
instructionsTxt = new Text2('Tap to flap!', {
	size: 80,
	fill: 0xFFFFFF
});
instructionsTxt.anchor.set(0.5, 0.5);
LK.gui.center.addChild(instructionsTxt);
// Tap to flap function
function handleTap() {
	if (!gameStarted) {
		gameStarted = true;
		instructionsTxt.visible = false;
		LK.playMusic('bgMusic');
	}
	bird.flap();
}
// Obstacle spawning function
function spawnObstacle() {
	var obstacleTypes = ['lollipop', 'birdNest', 'ufo', 'satellite', 'tree', 'balloon', 'bird', 'smily'];
	var chosenType = obstacleTypes[Math.floor(Math.random() * obstacleTypes.length)];
	var obstacle = new Obstacle(chosenType);
	// Set position
	obstacle.x = 2048 + obstacle.width;
	// Random vertical position for the gap, keeping it away from the very top and bottom
	var minY = 100; // Ensure taller obstacles are fully visible
	var maxY = 2732 - 500 - minGapSize - obstacle.children[0].height; // Adjust maxY to account for obstacle height
	obstacle.y = minY + Math.random() * (maxY - minY);
	// Adjust gap size based on score (gets narrower as score increases)
	var gapSize = minGapSize + 300 - Math.min(200, score * 5);
	obstacle.setGapSize(gapSize);
	// Adjust speed based on score (gets faster as score increases)
	obstacle.speed = baseObstacleSpeed + Math.min(5, score * 0.1);
	obstacles.push(obstacle);
	game.addChild(obstacle);
}
// Handle tap or click
game.down = function (x, y, obj) {
	handleTap();
	bird.holdFlying = true;
};
// Handle release of mouse or touch
game.up = function (x, y, obj) {
	bird.holdFlying = false;
};
// Game update loop
game.update = function () {
	// Update clouds
	for (var i = 0; i < clouds.length; i++) {
		clouds[i].update();
	}
	if (!gameStarted) {
		return;
	}
	// Spawn obstacles
	if (LK.ticks % spawnInterval === 0) {
		spawnObstacle();
	}
	// Spawn fuel collectible occasionally
	if (LK.ticks % (spawnInterval * Math.max(3, 5 - Math.floor(score / 10))) === 0) {
		if (Math.random() < 0.1) {
			// 10% chance to spawn a power-up
			var powerUp = new PowerUp();
			powerUp.x = 2048 + 50;
			powerUp.y = 150 + Math.random() * (2732 - 900 - minGapSize);
			game.addChild(powerUp);
		}
		var fuelType = Math.random() < 0.8 ? 'smallFuelCollectible' : 'bigFuelCollectible'; // 80% chance for small, 20% for big
		var fuelCollectible = new FuelCollectible(fuelType);
		fuelCollectible.x = 2048 + 50;
		fuelCollectible.y = 150 + Math.random() * (2732 - 900 - minGapSize);
		game.addChild(fuelCollectible);
	}
	// Update obstacles
	for (var j = obstacles.length - 1; j >= 0; j--) {
		var obstacle = obstacles[j];
		obstacle.update();
		// Check if bird passed obstacle
		if (!obstacle.passed && bird.x > obstacle.x + obstacle.width / 2) {
			obstacle.passed = true;
			score++;
			LK.setScore(score);
			scoreTxt.setText(score.toString());
			LK.getSound('score').play();
			// Update high score if needed
			if (score > highScore) {
				highScore = score;
				storage.highScore = highScore;
				highScoreTxt.setText('Best: ' + highScore);
			}
		}
		// Check for collision with bird
		if (bird.alive) {
			var topObstacleBounds = new Rectangle(obstacle.x - obstacle.width / 2, obstacle.y - obstacle.children[0].height, obstacle.width, obstacle.children[0].height);
			var bottomObstacleBounds = new Rectangle(obstacle.x - obstacle.width / 2, obstacle.y + obstacle.children[1].y, obstacle.width, obstacle.children[1].height);
			var birdBounds = new Rectangle(bird.x - 60, bird.y - 40, 120, 80);
			// Check collision with top obstacle
			if (birdBounds.x + birdBounds.width > topObstacleBounds.x && birdBounds.x < topObstacleBounds.x + topObstacleBounds.width && birdBounds.y + birdBounds.height > topObstacleBounds.y && birdBounds.y < topObstacleBounds.y + topObstacleBounds.height) {
				bird.die();
			}
			// Check collision with bottom obstacle
			if (birdBounds.x + birdBounds.width > bottomObstacleBounds.x && birdBounds.x < bottomObstacleBounds.x + bottomObstacleBounds.width && birdBounds.y < bottomObstacleBounds.y + bottomObstacleBounds.height && birdBounds.y + birdBounds.height > bottomObstacleBounds.y) {
				bird.die();
			}
		}
		// Remove obstacles that are off-screen
		if (obstacle.x < -obstacle.width) {
			obstacle.destroy();
			obstacles.splice(j, 1);
		}
	}
	// Update fuel bar
	fuelBar.update();
	// Check for fuel collection
	var fuelCollectibles = game.children.filter(function (child) {
		return child instanceof FuelCollectible;
	});
	for (var k = fuelCollectibles.length - 1; k >= 0; k--) {
		var fuel = fuelCollectibles[k];
		if (bird.intersects(fuel)) {
			if (fuel.type === 'smallFuelCollectible') {
				var smallFuelValue = 20 + Math.min(5, score * 0.1); // Scale with score
				fuelBar.refill(smallFuelValue); // Refill fuel bar
				LK.getSound('collectSmallFuel').play();
			} else if (fuel.type === 'bigFuelCollectible') {
				fuelBar.refill(fuelBar.maxFuel); // Instantly refill to 100%
				LK.getSound('collectBigFuel').play();
				// Add a satisfying animation for full refill
				tween(fuelBar, {
					scaleX: 1.2,
					scaleY: 1.2
				}, {
					duration: 300,
					easing: tween.easeOut,
					onFinish: function onFinish() {
						tween(fuelBar, {
							scaleX: 1,
							scaleY: 1
						}, {
							duration: 300,
							easing: tween.easeIn
						});
					}
				});
			}
			fuel.destroy();
		}
	}
	// Check for power-up collection
	var powerUps = game.children.filter(function (child) {
		return child instanceof PowerUp;
	});
	for (var l = powerUps.length - 1; l >= 0; l--) {
		var powerUp = powerUps[l];
		if (bird.intersects(powerUp)) {
			baseObstacleSpeed += 2; // Increase speed
			LK.setTimeout(function () {
				baseObstacleSpeed -= 2; // Revert speed after 10 seconds
			}, 10000);
			powerUp.destroy();
		}
	}
	// Update bird
	bird.update();
};

===================================================================
--- original.js
+++ change.js
@@ -94,9 +94,9 @@
 		anchorY: 0.5
 	});
 	self.update = function () {
 		self.x -= baseObstacleSpeed; // Move fuel tanks from right to left
-		collectible.rotation += 0.05; // Slow spin 
+		collectible.rotation -= 0.05; // Reverse slow spin
 		collectible.alpha = 0.8 + 0.2 * Math.sin(LK.ticks * 0.1); // Light glow effect 
 		if (self.x < -collectible.width) {
 			self.destroy();
 		}