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

/**** 
* Classes
****/ 
var Asteroid = Container.expand(function () {
	var self = Container.call(this);
	var asteroidGraphics = self.attachAsset('asteroid', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3.0,
		scaleY: 3.0
	});
	self.speed = 12 + Math.random() * 10;
	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
	self.update = function () {
		self.y += self.speed;
		asteroidGraphics.rotation += self.rotationSpeed;
	};
	return self;
});
var Coin = Container.expand(function () {
	var self = Container.call(this);
	var coinGraphics = self.attachAsset('coin', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2.5,
		scaleY: 2.5
	});
	self.speed = 8 + Math.random() * 4;
	self.rotationSpeed = (Math.random() - 0.5) * 0.1;
	// Add floating animation
	self.floatDirection = 1;
	self.floatSpeed = 0.03 + Math.random() * 0.02;
	self.floatAmount = 12 + Math.random() * 8;
	self.floatTimer = Math.random() * 120;
	self.update = function () {
		self.y += self.speed;
		coinGraphics.rotation += self.rotationSpeed;
		// Add floating effect
		self.floatTimer += self.floatSpeed;
		var floatOffset = Math.sin(self.floatTimer) * self.floatAmount;
		coinGraphics.y = floatOffset;
	};
	return self;
});
var Debris = Container.expand(function () {
	var self = Container.call(this);
	var debrisGraphics = self.attachAsset('debris', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.5,
		scaleY: 1.5
	});
	// Make medium debris darker
	debrisGraphics.tint = 0x404040;
	self.speed = 10 + Math.random() * 8;
	self.horizontalSpeed = (Math.random() - 0.5) * 2;
	self.update = function () {
		self.y += self.speed;
		self.x += self.horizontalSpeed;
	};
	return self;
});
var Fuel = Container.expand(function () {
	var self = Container.call(this);
	var fuelGraphics = self.attachAsset('fuel', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 3.0,
		scaleY: 3.0
	});
	self.speed = 9 + Math.random() * 6;
	// Start floating animation
	self.floatDirection = 1;
	self.floatSpeed = 0.02 + Math.random() * 0.02;
	self.floatAmount = 15 + Math.random() * 10;
	self.originalY = 0;
	self.floatTimer = Math.random() * 120;
	// Add diverse rotation properties
	self.rotationSpeed = (Math.random() - 0.5) * 0.04; // Random speed between -0.02 and 0.02
	self.rotationDirection = Math.random() > 0.5 ? 1 : -1; // Random direction
	self.update = function () {
		self.y += self.speed;
		// Add floating effect
		self.floatTimer += self.floatSpeed;
		var floatOffset = Math.sin(self.floatTimer) * self.floatAmount;
		fuelGraphics.y = floatOffset;
		// Add diverse rotation
		fuelGraphics.rotation += self.rotationSpeed * self.rotationDirection;
	};
	return self;
});
var Spaceship = Container.expand(function () {
	var self = Container.call(this);
	var shipGraphics = self.attachAsset('spaceship', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 2.0,
		scaleY: 2.0
	});
	self.speed = 0;
	self.maxSpeed = 8;
	self.acceleration = 0.3;
	self.friction = 0.85;
	self.targetX = 1024; // Default center position
	self.update = function () {
		// Smoothly move towards target position
		var deltaX = self.targetX - self.x;
		self.x += deltaX * 0.2; // Smooth interpolation factor
		// Keep ship within bounds
		if (self.x < 40) {
			self.x = 40;
		}
		if (self.x > 2008) {
			self.x = 2008;
		}
	};
	self.moveLeft = function () {
		self.speed = Math.max(self.speed - self.acceleration, -self.maxSpeed);
	};
	self.moveRight = function () {
		self.speed = Math.min(self.speed + self.acceleration, self.maxSpeed);
	};
	self.setTargetX = function (x) {
		self.targetX = x;
	};
	return self;
});
var Spark = Container.expand(function () {
	var self = Container.call(this);
	var sparkGraphics = self.attachAsset('debris', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.2 + Math.random() * 0.3,
		scaleY: 0.5 + Math.random() * 0.6
	});
	// Make all sparks orange color
	sparkGraphics.tint = 0xff6600;
	self.speed = 8 + Math.random() * 6;
	self.horizontalSpeed = (Math.random() - 0.5) * 4;
	self.life = 30 + Math.random() * 20;
	self.maxLife = self.life;
	self.update = function () {
		self.y += self.speed;
		self.x += self.horizontalSpeed;
		self.life--;
		// Fade out over time with higher minimum opacity
		self.alpha = Math.max(0.3, self.life / self.maxLife);
		// Scale down over time but maintain larger minimum size
		var scale = Math.max(0.2, self.life / self.maxLife * 0.5);
		sparkGraphics.scaleX = scale;
		sparkGraphics.scaleY = scale;
	};
	return self;
});
var Star = Container.expand(function () {
	var self = Container.call(this);
	var starGraphics = self.attachAsset('debris', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.2 + Math.random() * 0.3,
		scaleY: 0.2 + Math.random() * 0.3
	});
	// Make stars white and bright
	starGraphics.tint = 0xffffff;
	self.speed = 3 + Math.random() * 4;
	self.twinkleTimer = Math.random() * 120;
	self.maxAlpha = 0.8 + Math.random() * 0.2;
	self.alpha = self.maxAlpha;
	self.update = function () {
		self.y += self.speed;
		// Twinkling effect
		self.twinkleTimer += 1;
		var twinkle = Math.sin(self.twinkleTimer * 0.05) * 0.3 + 0.7;
		self.alpha = self.maxAlpha * twinkle;
	};
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000011
});

/**** 
* Game Code
****/ 
// Game state management
var gameStarted = false;
var inventoryScreenShown = false;
var startScreen = null;
var startButton = null;
var secondButton = null;
var secondButtonText = null;
var shopButton = null;
var shopButtonText = null;
var inventoryScreen = null;
var inventoryBackButton = null;
var inventoryBackButtonText = null;
var spaceship = new Spaceship();
var obstacles = [];
var stars = [];
var sparks = [];
var scrollSpeed = 6;
var spawnTimer = 0;
var spawnRate = 120; // frames between spawns
var gameSpeed = 1;
var altitude = 0;
var lastTouchX = null;
var isDragging = false;
var maxHealth = 100;
var currentHealth = 100;
var healthBarBg;
var healthBarFill;
var maxFuel = 100;
var currentFuel = 100;
var fuelBarBg;
var fuelBarFill;
var fuelConsumptionRate = 0.15; // Fuel consumed per frame
var fuelPickups = [];
var coins = [];
// Create horizontal bar behind spaceship
var spaceshipBar = LK.getAsset('spaceshipBar', {
	anchorX: 0.5,
	anchorY: 0.5
});
spaceshipBar.x = 1024;
spaceshipBar.y = 2400;
spaceshipBar.alpha = 0.5; // Make bar even more transparent
game.addChild(spaceshipBar);
// Position spaceship
spaceship.x = 1024;
spaceship.y = 2400;
game.addChild(spaceship);
// Create score display
var scoreText = new Text2('Altitude: 0m', {
	size: 60,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0.5, 0);
scoreText.visible = false; // Hide initially
LK.gui.top.addChild(scoreText);
// Create altitude display
var altitudeText = new Text2('Score: 0', {
	size: 50,
	fill: 0xFFFFFF
});
altitudeText.anchor.set(0.5, 0);
altitudeText.y = 80;
altitudeText.visible = false; // Hide initially
LK.gui.top.addChild(altitudeText);
// Create health bar background
healthBarBg = LK.getAsset('healthBarBg', {
	anchorX: 0.5,
	anchorY: 0.0
});
healthBarBg.x = 1024;
healthBarBg.y = 200;
game.addChild(healthBarBg);
// Create health bar fill
healthBarFill = LK.getAsset('healthBarFill', {
	anchorX: 0.5,
	anchorY: 0.0
});
healthBarFill.x = 1024;
healthBarFill.y = 202;
game.addChild(healthBarFill);
// Create fuel bar background
fuelBarBg = LK.getAsset('fuelBarBg', {
	anchorX: 0.5,
	anchorY: 0.0
});
fuelBarBg.x = 150;
fuelBarBg.y = 300;
game.addChild(fuelBarBg);
// Create fuel bar fill
fuelBarFill = LK.getAsset('fuelBarFill', {
	anchorX: 0.5,
	anchorY: 0.0
});
fuelBarFill.x = 150;
fuelBarFill.y = 302;
game.addChild(fuelBarFill);
// Create fuel icon below fuel bar
var fuelIcon = LK.getAsset('fuel', {
	anchorX: 0.5,
	anchorY: 0.0,
	scaleX: 2.5,
	scaleY: 2.5
});
fuelIcon.x = 150;
fuelIcon.y = 1850; // Position below the fuel bar
game.addChild(fuelIcon);
// Start pulsing animation for fuel icon
function startFuelIconPulse() {
	tween(fuelIcon, {
		scaleX: 2.0,
		scaleY: 2.0
	}, {
		duration: 800,
		easing: tween.easeInOut,
		onFinish: function onFinish() {
			tween(fuelIcon, {
				scaleX: 2.5,
				scaleY: 2.5
			}, {
				duration: 800,
				easing: tween.easeInOut,
				onFinish: startFuelIconPulse
			});
		}
	});
}
startFuelIconPulse();
function createObstacle() {
	var obstacle;
	if (Math.random() < 0.7) {
		obstacle = new Asteroid();
	} else {
		obstacle = new Debris();
	}
	obstacle.x = Math.random() * (2048 - 100) + 50;
	obstacle.y = -50;
	obstacles.push(obstacle);
	game.addChild(obstacle);
	// Z-index management: larger objects (asteroids) should render above smaller objects (debris)
	// Find the correct index to insert this obstacle
	var targetIndex = game.getChildIndex(obstacle); // Start with current index
	var maxIndex = game.children.length - 1;
	// Only reorder if we have other obstacles to compare with
	if (obstacle instanceof Asteroid) {
		// Asteroids should be above debris - find the highest debris index
		for (var j = 0; j < game.children.length; j++) {
			var child = game.children[j];
			if (child instanceof Debris) {
				targetIndex = Math.min(j + 1, maxIndex);
			}
		}
	} else if (obstacle instanceof Debris) {
		// Debris should be below asteroids - find the lowest asteroid index  
		for (var j = 0; j < game.children.length; j++) {
			var child = game.children[j];
			if (child instanceof Asteroid) {
				targetIndex = Math.max(j - 1, 0);
				break; // Insert before first asteroid
			}
		}
	}
	// Ensure targetIndex is within valid bounds
	targetIndex = Math.max(0, Math.min(targetIndex, maxIndex));
	game.setChildIndex(obstacle, targetIndex);
}
function handleTouch(x, y) {
	// Directly set spaceship target to cursor position
	spaceship.setTargetX(x);
}
game.down = function (x, y, obj) {
	if (inventoryScreenShown) {
		// Check if back button was clicked in inventory screen
		if (inventoryBackButton && x >= inventoryBackButton.x - 495 && x <= inventoryBackButton.x + 495 && y >= inventoryBackButton.y - 48 && y <= inventoryBackButton.y + 48) {
			inventoryScreenShown = false;
			removeInventoryScreen();
			createStartScreen();
		}
		return;
	}
	if (!gameStarted) {
		// Check if start button was clicked
		if (startButton && x >= startButton.x - 495 && x <= startButton.x + 495 && y >= startButton.y - 48 && y <= startButton.y + 48) {
			gameStarted = true;
			removeStartScreen();
		}
		// Check if second button was clicked
		if (secondButton && x >= secondButton.x - 495 && x <= secondButton.x + 495 && y >= secondButton.y - 48 && y <= secondButton.y + 48) {
			// Show inventory screen
			inventoryScreenShown = true;
			removeStartScreen();
			createInventoryScreen();
		}
		return;
	}
	isDragging = true;
	lastTouchX = x;
	handleTouch(x, y);
};
game.move = function (x, y, obj) {
	if (!gameStarted) return;
	// Always follow cursor, not just when dragging
	handleTouch(x, y);
};
game.up = function (x, y, obj) {
	isDragging = false;
	lastTouchX = null;
};
game.update = function () {
	if (inventoryScreenShown || !gameStarted) {
		// Only update twinkling stars on start screen and inventory screen
		if (LK.ticks % 15 === 0) {
			var star = new Star();
			star.x = Math.random() * 2048;
			star.y = -10;
			stars.push(star);
			game.addChild(star);
			// Move star behind everything
			game.setChildIndex(star, 0);
		}
		// Update and cleanup stars
		for (var s = stars.length - 1; s >= 0; s--) {
			var star = stars[s];
			if (star.lastY === undefined) star.lastY = star.y;
			if (star.lastY < 2800 && star.y >= 2800) {
				star.destroy();
				stars.splice(s, 1);
				continue;
			}
			star.lastY = star.y;
		}
		return;
	}
	// Update altitude only
	altitude += scrollSpeed;
	// Update displays
	scoreText.setText('Altitude: ' + Math.floor(altitude) + 'm');
	altitudeText.setText('Score: ' + LK.getScore());
	// Increase difficulty over time
	if (LK.ticks % 600 === 0) {
		// Every 10 seconds
		gameSpeed += 0.1;
		scrollSpeed = Math.min(scrollSpeed + 0.3, 10);
		spawnRate = Math.max(spawnRate - 5, 30);
	}
	// Spawn obstacles - increase frequency based on altitude
	spawnTimer++;
	// Calculate dynamic spawn rate based on altitude
	var altitudeBasedSpawnRate = Math.max(spawnRate - Math.floor(altitude / 500), 15); // Decrease spawn rate (increase frequency) every 500m altitude, minimum 15 frames
	if (spawnTimer >= altitudeBasedSpawnRate) {
		// Spawn normal obstacle first
		createObstacle();
		// Spawn additional large asteroids based on altitude (not small debris)
		var extraAsteroidCount = Math.floor(altitude / 2000); // Add extra asteroid every 2000m altitude
		for (var obs = 0; obs < extraAsteroidCount; obs++) {
			// Force spawn only asteroids for altitude-based increases
			var asteroid = new Asteroid();
			asteroid.x = Math.random() * (2048 - 100) + 50;
			asteroid.y = -50;
			obstacles.push(asteroid);
			game.addChild(asteroid);
			// Z-index management for asteroids
			var targetIndex = game.getChildIndex(asteroid);
			var maxIndex = game.children.length - 1;
			for (var j = 0; j < game.children.length; j++) {
				var child = game.children[j];
				if (child instanceof Debris) {
					targetIndex = Math.min(j + 1, maxIndex);
				}
			}
			targetIndex = Math.max(0, Math.min(targetIndex, maxIndex));
			game.setChildIndex(asteroid, targetIndex);
		}
		spawnTimer = 0;
	}
	// Consume fuel constantly
	currentFuel -= fuelConsumptionRate;
	if (currentFuel < 0) currentFuel = 0;
	// Update fuel bar
	var fuelPercent = currentFuel / maxFuel;
	fuelBarFill.scaleY = fuelPercent;
	fuelBarFill.y = 302 + 1596 * (1 - fuelPercent);
	// Fuel bar maintains original blue color - no color changes
	// Lose health when out of fuel
	if (currentFuel <= 0) {
		currentHealth -= 1;
		// Update health bar
		var healthPercent = currentHealth / maxHealth;
		healthBarFill.scaleX = healthPercent;
		healthBarFill.x = 1024 - 148 + 296 * healthPercent * 0.5;
		// Check if health is depleted
		if (currentHealth <= 0) {
			LK.effects.flashScreen(0xff0000, 1000);
			LK.showGameOver();
			return;
		}
	}
	// Spawn fuel pickups occasionally
	if (LK.ticks % 300 === 0) {
		// Every 5 seconds
		var fuelPickup = new Fuel();
		fuelPickup.x = Math.random() * (2048 - 100) + 50;
		fuelPickup.y = -50;
		fuelPickups.push(fuelPickup);
		game.addChild(fuelPickup);
	}
	// Spawn coins regularly
	if (LK.ticks % 180 === 0) {
		// Every 3 seconds
		var coin = new Coin();
		coin.x = Math.random() * (2048 - 100) + 50;
		coin.y = -50;
		coins.push(coin);
		game.addChild(coin);
	}
	// Update fuel pickups and check collisions
	for (var f = fuelPickups.length - 1; f >= 0; f--) {
		var fuelPickup = fuelPickups[f];
		// Track last position for cleanup
		if (fuelPickup.lastY === undefined) fuelPickup.lastY = fuelPickup.y;
		// Remove fuel pickups that are off screen
		if (fuelPickup.lastY < 2800 && fuelPickup.y >= 2800) {
			fuelPickup.destroy();
			fuelPickups.splice(f, 1);
			continue;
		}
		// Check collision with spaceship
		if (fuelPickup.intersects(spaceship)) {
			// Completely refill fuel
			currentFuel = maxFuel;
			LK.getSound('fuel_pickup').play();
			fuelPickup.destroy();
			fuelPickups.splice(f, 1);
			continue;
		}
		fuelPickup.lastY = fuelPickup.y;
	}
	// Update coins and check collisions
	for (var c = coins.length - 1; c >= 0; c--) {
		var coin = coins[c];
		// Track last position for cleanup
		if (coin.lastY === undefined) coin.lastY = coin.y;
		// Remove coins that are off screen
		if (coin.lastY < 2800 && coin.y >= 2800) {
			coin.destroy();
			coins.splice(c, 1);
			continue;
		}
		// Check collision with spaceship
		if (coin.intersects(spaceship)) {
			// Increase score when collecting coin
			LK.setScore(LK.getScore() + 1);
			LK.getSound('coin_collect').play();
			coin.destroy();
			coins.splice(c, 1);
			continue;
		}
		coin.lastY = coin.y;
	}
	// Update obstacles and check collisions
	for (var i = obstacles.length - 1; i >= 0; i--) {
		var obstacle = obstacles[i];
		// Track last position for cleanup
		if (obstacle.lastY === undefined) obstacle.lastY = obstacle.y;
		// Remove obstacles that are off screen
		if (obstacle.lastY < 2800 && obstacle.y >= 2800) {
			obstacle.destroy();
			obstacles.splice(i, 1);
			continue;
		}
		// Check collision with spaceship
		if (obstacle.intersects(spaceship)) {
			// Only deal damage if it's an asteroid (not small debris or stars)
			if (obstacle instanceof Asteroid) {
				// Reduce health instead of immediate game over
				currentHealth -= 20;
				// Update health bar
				var healthPercent = currentHealth / maxHealth;
				healthBarFill.scaleX = healthPercent;
				healthBarFill.x = 1024 - 148 + 296 * healthPercent * 0.5;
				// Flash screen red briefly
				LK.effects.flashScreen(0xff0000, 300);
				LK.getSound('explosion').play();
				// Check if health is depleted
				if (currentHealth <= 0) {
					LK.effects.flashScreen(0xff0000, 1000);
					LK.showGameOver();
					return;
				}
				// Remove only asteroids that hit us
				obstacle.destroy();
				obstacles.splice(i, 1);
				continue;
			}
		}
		obstacle.lastY = obstacle.y;
	}
	// Spawn beautiful twinkling stars
	if (LK.ticks % 15 === 0) {
		var star = new Star();
		star.x = Math.random() * 2048;
		star.y = -10;
		stars.push(star);
		game.addChild(star);
		// Move star behind spaceship bar
		game.setChildIndex(star, 0);
	}
	// Update stars and remove off-screen ones
	for (var s = stars.length - 1; s >= 0; s--) {
		var star = stars[s];
		// Track last position for cleanup
		if (star.lastY === undefined) star.lastY = star.y;
		// Remove stars that are off screen
		if (star.lastY < 2800 && star.y >= 2800) {
			star.destroy();
			stars.splice(s, 1);
			continue;
		}
		star.lastY = star.y;
	}
	// Spawn fire sparks from spaceship thrusters
	if (LK.ticks % 3 === 0) {
		// Create 2-3 sparks every few frames
		var sparkCount = 2 + Math.floor(Math.random() * 2);
		for (var sp = 0; sp < sparkCount; sp++) {
			var spark = new Spark();
			// Position sparks at bottom of spaceship with some spread
			spark.x = spaceship.x + (Math.random() - 0.5) * 60;
			spark.y = spaceship.y + 60; // Bottom of spaceship
			sparks.push(spark);
			game.addChild(spark);
		}
	}
	// Move spaceship elements to front every frame to stay above obstacles
	game.setChildIndex(spaceshipBar, game.children.length - 1);
	game.setChildIndex(spaceship, game.children.length - 1);
	// Move all sparks to front to stay above obstacles
	for (var sp = 0; sp < sparks.length; sp++) {
		var spark = sparks[sp];
		if (spark.parent === game) {
			game.setChildIndex(spark, game.children.length - 1);
		}
	}
	// Update sparks and remove dead ones
	for (var k = sparks.length - 1; k >= 0; k--) {
		var spark = sparks[k];
		// Remove sparks that are dead or off screen
		if (spark.life <= 0 || spark.y > 2800) {
			spark.destroy();
			sparks.splice(k, 1);
			continue;
		}
	}
};
// Pause functionality is handled automatically by LK engine
function createStartScreen() {
	// Create semi-transparent background
	startScreen = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 137.0
	});
	startScreen.x = 1024;
	startScreen.y = 1366;
	startScreen.alpha = 0.8;
	startScreen.tint = 0x000033;
	game.addChild(startScreen);
	// Create background for text content
	var textBackground = LK.getAsset('startScreenBg', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.28,
		scaleY: 2.732
	});
	textBackground.x = 1024;
	textBackground.y = 1366;
	textBackground.alpha = 1.0;
	game.addChild(textBackground);
	// Create title text
	var titleText = new Text2('SPACE NAVIGATOR', {
		size: 120,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	titleText.anchor.set(0.5, 0.5);
	titleText.x = 1024;
	titleText.y = 150;
	game.addChild(titleText);
	// Create start button
	startButton = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.45,
		scaleY: 12.0
	});
	startButton.x = 1024;
	startButton.y = 1000;
	startButton.tint = 0x00AA00;
	game.addChild(startButton);
	// Start pulsing animation for start button
	function startButtonPulse() {
		tween(startButton, {
			scaleX: 0.4,
			scaleY: 11.5,
			tint: 0x00FF00
		}, {
			duration: 600,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(startButton, {
					scaleX: 0.45,
					scaleY: 12.0,
					tint: 0x00AA00
				}, {
					duration: 600,
					easing: tween.easeInOut,
					onFinish: startButtonPulse
				});
			}
		});
	}
	startButtonPulse();
	// Create button text
	var buttonText = new Text2('START GAME', {
		size: 80,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	buttonText.anchor.set(0.5, 0.5);
	buttonText.x = 1024;
	buttonText.y = 1000;
	game.addChild(buttonText);
	// Create second button
	secondButton = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.45,
		scaleY: 12.0
	});
	secondButton.x = 1024;
	secondButton.y = 1300;
	secondButton.tint = 0xD2B48C;
	game.addChild(secondButton);
	// Start pulsing animation for second button
	function secondButtonPulse() {
		tween(secondButton, {
			scaleX: 0.4,
			scaleY: 11.5,
			tint: 0xF5DEB3
		}, {
			duration: 600,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(secondButton, {
					scaleX: 0.45,
					scaleY: 12.0,
					tint: 0xD2B48C
				}, {
					duration: 600,
					easing: tween.easeInOut,
					onFinish: secondButtonPulse
				});
			}
		});
	}
	secondButtonPulse();
	// Create second button text
	secondButtonText = new Text2('INVENTORY', {
		size: 80,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	secondButtonText.anchor.set(0.5, 0.5);
	secondButtonText.x = 1024;
	secondButtonText.y = 1300;
	game.addChild(secondButtonText);
	// Create shop button
	var shopButton = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.45,
		scaleY: 12.0
	});
	shopButton.x = 1024;
	shopButton.y = 1600;
	shopButton.tint = 0x00BFFF;
	game.addChild(shopButton);
	// Start pulsing animation for shop button
	function shopButtonPulse() {
		tween(shopButton, {
			scaleX: 0.4,
			scaleY: 11.5,
			tint: 0x00BFFF
		}, {
			duration: 600,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(shopButton, {
					scaleX: 0.45,
					scaleY: 12.0,
					tint: 0x00BFFF
				}, {
					duration: 600,
					easing: tween.easeInOut,
					onFinish: shopButtonPulse
				});
			}
		});
	}
	shopButtonPulse();
	// Create shop button text
	var shopButtonText = new Text2('SHOP', {
		size: 80,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	shopButtonText.anchor.set(0.5, 0.5);
	shopButtonText.x = 1024;
	shopButtonText.y = 1600;
	game.addChild(shopButtonText);
	// Hide main menu button when start screen is shown
	mainMenuButton.visible = false;
	// Store references for cleanup
	startScreen.titleText = titleText;
	startScreen.buttonText = buttonText;
	startScreen.textBackground = textBackground;
	startScreen.secondButton = secondButton;
	startScreen.secondButtonText = secondButtonText;
	startScreen.shopButton = shopButton;
	startScreen.shopButtonText = shopButtonText;
}
function removeStartScreen() {
	if (startScreen) {
		// Stop any ongoing tween animations on the start button
		if (startButton) {
			tween.stop(startButton);
		}
		// Stop any ongoing tween animations on the second button
		if (secondButton) {
			tween.stop(secondButton);
		}
		// Stop any ongoing tween animations on the shop button
		if (shopButton) {
			tween.stop(shopButton);
		}
		// Show main menu button when game starts
		mainMenuButton.visible = true;
		// Show altitude and score text when game starts
		scoreText.visible = true;
		altitudeText.visible = true;
		startScreen.destroy();
		startScreen.titleText.destroy();
		startScreen.buttonText.destroy();
		startScreen.textBackground.destroy();
		startButton.destroy();
		secondButton.destroy();
		secondButtonText.destroy();
		shopButton.destroy();
		shopButtonText.destroy();
		startScreen = null;
		startButton = null;
		secondButton = null;
		secondButtonText = null;
		shopButton = null;
		shopButtonText = null;
	}
}
// Create main menu button next to pause button
var mainMenuButton = new Text2('MENU', {
	size: 55,
	fill: 0xFFFFFF
});
mainMenuButton.anchor.set(0, 0);
mainMenuButton.x = 160; // Position to the right of pause button area
mainMenuButton.y = 50;
LK.gui.addChild(mainMenuButton);
// Add touch handler for main menu button
mainMenuButton.down = function (x, y, obj) {
	// Reset game state and show start screen
	gameStarted = false;
	inventoryScreenShown = false;
	// Hide altitude and score text when returning to main menu
	scoreText.visible = false;
	altitudeText.visible = false;
	// Clear all game objects
	for (var i = obstacles.length - 1; i >= 0; i--) {
		obstacles[i].destroy();
	}
	obstacles = [];
	for (var s = stars.length - 1; s >= 0; s--) {
		stars[s].destroy();
	}
	stars = [];
	for (var sp = sparks.length - 1; sp >= 0; sp--) {
		sparks[sp].destroy();
	}
	sparks = [];
	for (var f = fuelPickups.length - 1; f >= 0; f--) {
		fuelPickups[f].destroy();
	}
	fuelPickups = [];
	for (var c = coins.length - 1; c >= 0; c--) {
		coins[c].destroy();
	}
	coins = [];
	// Reset game variables
	altitude = 0;
	scrollSpeed = 6;
	spawnTimer = 0;
	spawnRate = 120;
	gameSpeed = 1;
	currentHealth = 100;
	currentFuel = 100;
	LK.setScore(0);
	// Reset spaceship position
	spaceship.x = 1024;
	spaceship.y = 2400;
	spaceship.targetX = 1024;
	// Reset health bar
	var healthPercent = currentHealth / maxHealth;
	healthBarFill.scaleX = healthPercent;
	healthBarFill.x = 1024 - 148 + 296 * healthPercent * 0.5;
	// Reset fuel bar
	var fuelPercent = currentFuel / maxFuel;
	fuelBarFill.scaleY = fuelPercent;
	fuelBarFill.y = 302 + 1596 * (1 - fuelPercent);
	// Show start screen
	createStartScreen();
};
function createInventoryScreen() {
	// Create semi-transparent background
	inventoryScreen = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.0,
		scaleY: 137.0
	});
	inventoryScreen.x = 1024;
	inventoryScreen.y = 1366;
	inventoryScreen.alpha = 0.8;
	inventoryScreen.tint = 0x000033;
	game.addChild(inventoryScreen);
	// Create background for content
	var inventoryBackground = LK.getAsset('startScreenBg', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 1.28,
		scaleY: 2.732
	});
	inventoryBackground.x = 1024;
	inventoryBackground.y = 1366;
	inventoryBackground.alpha = 1.0;
	game.addChild(inventoryBackground);
	// Create title text
	var inventoryTitleText = new Text2('INVENTORY', {
		size: 120,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	inventoryTitleText.anchor.set(0.5, 0.5);
	inventoryTitleText.x = 1024;
	inventoryTitleText.y = 300;
	game.addChild(inventoryTitleText);
	// Create back button
	inventoryBackButton = LK.getAsset('spaceshipBar', {
		anchorX: 0.5,
		anchorY: 0.5,
		scaleX: 0.45,
		scaleY: 12.0
	});
	inventoryBackButton.x = 1024;
	inventoryBackButton.y = 2200;
	inventoryBackButton.tint = 0x666666;
	game.addChild(inventoryBackButton);
	// Start pulsing animation for back button
	function inventoryBackButtonPulse() {
		tween(inventoryBackButton, {
			scaleX: 0.4,
			scaleY: 11.5,
			tint: 0x888888
		}, {
			duration: 600,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(inventoryBackButton, {
					scaleX: 0.45,
					scaleY: 12.0,
					tint: 0x666666
				}, {
					duration: 600,
					easing: tween.easeInOut,
					onFinish: inventoryBackButtonPulse
				});
			}
		});
	}
	inventoryBackButtonPulse();
	// Create coins display
	var coinsText = new Text2('Coins: ' + LK.getScore(), {
		size: 80,
		fill: 0xFFD700,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	coinsText.anchor.set(0.5, 0.5);
	coinsText.x = 1024;
	coinsText.y = 500;
	game.addChild(coinsText);
	// Create fuel tank upgrade section
	var fuelUpgradeText = new Text2('Fuel Tank Upgrade', {
		size: 70,
		fill: 0x00AAFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	fuelUpgradeText.anchor.set(0.5, 0.5);
	fuelUpgradeText.x = 1024;
	fuelUpgradeText.y = 800;
	game.addChild(fuelUpgradeText);
	var fuelUpgradeDesc = new Text2('Increase fuel capacity by 25%', {
		size: 50,
		fill: 0xCCCCCC,
		font: "'Arial', sans-serif"
	});
	fuelUpgradeDesc.anchor.set(0.5, 0.5);
	fuelUpgradeDesc.x = 1024;
	fuelUpgradeDesc.y = 880;
	game.addChild(fuelUpgradeDesc);
	var fuelUpgradeCost = new Text2('Cost: 50 coins', {
		size: 60,
		fill: 0xFFD700,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	fuelUpgradeCost.anchor.set(0.5, 0.5);
	fuelUpgradeCost.x = 1024;
	fuelUpgradeCost.y = 940;
	game.addChild(fuelUpgradeCost);
	// Create ship speed upgrade section
	var speedUpgradeText = new Text2('Ship Speed Upgrade', {
		size: 70,
		fill: 0xFF6600,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	speedUpgradeText.anchor.set(0.5, 0.5);
	speedUpgradeText.x = 1024;
	speedUpgradeText.y = 1200;
	game.addChild(speedUpgradeText);
	var speedUpgradeDesc = new Text2('Increase ship maneuverability', {
		size: 50,
		fill: 0xCCCCCC,
		font: "'Arial', sans-serif"
	});
	speedUpgradeDesc.anchor.set(0.5, 0.5);
	speedUpgradeDesc.x = 1024;
	speedUpgradeDesc.y = 1280;
	game.addChild(speedUpgradeDesc);
	var speedUpgradeCost = new Text2('Cost: 30 coins', {
		size: 60,
		fill: 0xFFD700,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	speedUpgradeCost.anchor.set(0.5, 0.5);
	speedUpgradeCost.x = 1024;
	speedUpgradeCost.y = 1340;
	game.addChild(speedUpgradeCost);
	// Create armor upgrade section
	var armorUpgradeText = new Text2('Armor Plating', {
		size: 70,
		fill: 0x888888,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	armorUpgradeText.anchor.set(0.5, 0.5);
	armorUpgradeText.x = 1024;
	armorUpgradeText.y = 1600;
	game.addChild(armorUpgradeText);
	var armorUpgradeDesc = new Text2('Reduce damage taken by 25%', {
		size: 50,
		fill: 0xCCCCCC,
		font: "'Arial', sans-serif"
	});
	armorUpgradeDesc.anchor.set(0.5, 0.5);
	armorUpgradeDesc.x = 1024;
	armorUpgradeDesc.y = 1680;
	game.addChild(armorUpgradeDesc);
	var armorUpgradeCost = new Text2('Cost: 75 coins', {
		size: 60,
		fill: 0xFFD700,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	armorUpgradeCost.anchor.set(0.5, 0.5);
	armorUpgradeCost.x = 1024;
	armorUpgradeCost.y = 1740;
	game.addChild(armorUpgradeCost);
	// Create back button text
	inventoryBackButtonText = new Text2('BACK', {
		size: 80,
		fill: 0xFFFFFF,
		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
	});
	inventoryBackButtonText.anchor.set(0.5, 0.5);
	inventoryBackButtonText.x = 1024;
	inventoryBackButtonText.y = 2200;
	game.addChild(inventoryBackButtonText);
	// Hide main menu button when inventory screen is shown
	mainMenuButton.visible = false;
	// Store references for cleanup
	inventoryScreen.inventoryTitleText = inventoryTitleText;
	inventoryScreen.inventoryBackground = inventoryBackground;
	inventoryScreen.inventoryBackButton = inventoryBackButton;
	inventoryScreen.inventoryBackButtonText = inventoryBackButtonText;
	inventoryScreen.coinsText = coinsText;
	inventoryScreen.fuelUpgradeText = fuelUpgradeText;
	inventoryScreen.fuelUpgradeDesc = fuelUpgradeDesc;
	inventoryScreen.fuelUpgradeCost = fuelUpgradeCost;
	inventoryScreen.speedUpgradeText = speedUpgradeText;
	inventoryScreen.speedUpgradeDesc = speedUpgradeDesc;
	inventoryScreen.speedUpgradeCost = speedUpgradeCost;
	inventoryScreen.armorUpgradeText = armorUpgradeText;
	inventoryScreen.armorUpgradeDesc = armorUpgradeDesc;
	inventoryScreen.armorUpgradeCost = armorUpgradeCost;
}
function removeInventoryScreen() {
	if (inventoryScreen) {
		// Stop any ongoing tween animations on the back button
		if (inventoryBackButton) {
			tween.stop(inventoryBackButton);
		}
		// Show main menu button when returning to start screen
		mainMenuButton.visible = true;
		inventoryScreen.destroy();
		inventoryScreen.inventoryTitleText.destroy();
		inventoryScreen.inventoryBackground.destroy();
		inventoryScreen.coinsText.destroy();
		inventoryScreen.fuelUpgradeText.destroy();
		inventoryScreen.fuelUpgradeDesc.destroy();
		inventoryScreen.fuelUpgradeCost.destroy();
		inventoryScreen.speedUpgradeText.destroy();
		inventoryScreen.speedUpgradeDesc.destroy();
		inventoryScreen.speedUpgradeCost.destroy();
		inventoryScreen.armorUpgradeText.destroy();
		inventoryScreen.armorUpgradeDesc.destroy();
		inventoryScreen.armorUpgradeCost.destroy();
		inventoryBackButton.destroy();
		inventoryBackButtonText.destroy();
		inventoryScreen = null;
		inventoryBackButton = null;
		inventoryBackButtonText = null;
	}
}
// Initialize start screen
createStartScreen();
// Start background music
LK.playMusic('space_music');
;

===================================================================
--- original.js
+++ change.js
@@ -987,8 +987,102 @@
 			}
 		});
 	}
 	inventoryBackButtonPulse();
+	// Create coins display
+	var coinsText = new Text2('Coins: ' + LK.getScore(), {
+		size: 80,
+		fill: 0xFFD700,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	coinsText.anchor.set(0.5, 0.5);
+	coinsText.x = 1024;
+	coinsText.y = 500;
+	game.addChild(coinsText);
+	// Create fuel tank upgrade section
+	var fuelUpgradeText = new Text2('Fuel Tank Upgrade', {
+		size: 70,
+		fill: 0x00AAFF,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	fuelUpgradeText.anchor.set(0.5, 0.5);
+	fuelUpgradeText.x = 1024;
+	fuelUpgradeText.y = 800;
+	game.addChild(fuelUpgradeText);
+	var fuelUpgradeDesc = new Text2('Increase fuel capacity by 25%', {
+		size: 50,
+		fill: 0xCCCCCC,
+		font: "'Arial', sans-serif"
+	});
+	fuelUpgradeDesc.anchor.set(0.5, 0.5);
+	fuelUpgradeDesc.x = 1024;
+	fuelUpgradeDesc.y = 880;
+	game.addChild(fuelUpgradeDesc);
+	var fuelUpgradeCost = new Text2('Cost: 50 coins', {
+		size: 60,
+		fill: 0xFFD700,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	fuelUpgradeCost.anchor.set(0.5, 0.5);
+	fuelUpgradeCost.x = 1024;
+	fuelUpgradeCost.y = 940;
+	game.addChild(fuelUpgradeCost);
+	// Create ship speed upgrade section
+	var speedUpgradeText = new Text2('Ship Speed Upgrade', {
+		size: 70,
+		fill: 0xFF6600,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	speedUpgradeText.anchor.set(0.5, 0.5);
+	speedUpgradeText.x = 1024;
+	speedUpgradeText.y = 1200;
+	game.addChild(speedUpgradeText);
+	var speedUpgradeDesc = new Text2('Increase ship maneuverability', {
+		size: 50,
+		fill: 0xCCCCCC,
+		font: "'Arial', sans-serif"
+	});
+	speedUpgradeDesc.anchor.set(0.5, 0.5);
+	speedUpgradeDesc.x = 1024;
+	speedUpgradeDesc.y = 1280;
+	game.addChild(speedUpgradeDesc);
+	var speedUpgradeCost = new Text2('Cost: 30 coins', {
+		size: 60,
+		fill: 0xFFD700,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	speedUpgradeCost.anchor.set(0.5, 0.5);
+	speedUpgradeCost.x = 1024;
+	speedUpgradeCost.y = 1340;
+	game.addChild(speedUpgradeCost);
+	// Create armor upgrade section
+	var armorUpgradeText = new Text2('Armor Plating', {
+		size: 70,
+		fill: 0x888888,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	armorUpgradeText.anchor.set(0.5, 0.5);
+	armorUpgradeText.x = 1024;
+	armorUpgradeText.y = 1600;
+	game.addChild(armorUpgradeText);
+	var armorUpgradeDesc = new Text2('Reduce damage taken by 25%', {
+		size: 50,
+		fill: 0xCCCCCC,
+		font: "'Arial', sans-serif"
+	});
+	armorUpgradeDesc.anchor.set(0.5, 0.5);
+	armorUpgradeDesc.x = 1024;
+	armorUpgradeDesc.y = 1680;
+	game.addChild(armorUpgradeDesc);
+	var armorUpgradeCost = new Text2('Cost: 75 coins', {
+		size: 60,
+		fill: 0xFFD700,
+		font: "'Arial Black', 'Impact', 'Helvetica Bold', sans-serif"
+	});
+	armorUpgradeCost.anchor.set(0.5, 0.5);
+	armorUpgradeCost.x = 1024;
+	armorUpgradeCost.y = 1740;
+	game.addChild(armorUpgradeCost);
 	// Create back button text
 	inventoryBackButtonText = new Text2('BACK', {
 		size: 80,
 		fill: 0xFFFFFF,
@@ -1004,8 +1098,18 @@
 	inventoryScreen.inventoryTitleText = inventoryTitleText;
 	inventoryScreen.inventoryBackground = inventoryBackground;
 	inventoryScreen.inventoryBackButton = inventoryBackButton;
 	inventoryScreen.inventoryBackButtonText = inventoryBackButtonText;
+	inventoryScreen.coinsText = coinsText;
+	inventoryScreen.fuelUpgradeText = fuelUpgradeText;
+	inventoryScreen.fuelUpgradeDesc = fuelUpgradeDesc;
+	inventoryScreen.fuelUpgradeCost = fuelUpgradeCost;
+	inventoryScreen.speedUpgradeText = speedUpgradeText;
+	inventoryScreen.speedUpgradeDesc = speedUpgradeDesc;
+	inventoryScreen.speedUpgradeCost = speedUpgradeCost;
+	inventoryScreen.armorUpgradeText = armorUpgradeText;
+	inventoryScreen.armorUpgradeDesc = armorUpgradeDesc;
+	inventoryScreen.armorUpgradeCost = armorUpgradeCost;
 }
 function removeInventoryScreen() {
 	if (inventoryScreen) {
 		// Stop any ongoing tween animations on the back button
@@ -1016,8 +1120,18 @@
 		mainMenuButton.visible = true;
 		inventoryScreen.destroy();
 		inventoryScreen.inventoryTitleText.destroy();
 		inventoryScreen.inventoryBackground.destroy();
+		inventoryScreen.coinsText.destroy();
+		inventoryScreen.fuelUpgradeText.destroy();
+		inventoryScreen.fuelUpgradeDesc.destroy();
+		inventoryScreen.fuelUpgradeCost.destroy();
+		inventoryScreen.speedUpgradeText.destroy();
+		inventoryScreen.speedUpgradeDesc.destroy();
+		inventoryScreen.speedUpgradeCost.destroy();
+		inventoryScreen.armorUpgradeText.destroy();
+		inventoryScreen.armorUpgradeDesc.destroy();
+		inventoryScreen.armorUpgradeCost.destroy();
 		inventoryBackButton.destroy();
 		inventoryBackButtonText.destroy();
 		inventoryScreen = null;
 		inventoryBackButton = null;