/**** 
* Plugins
****/ 
var tween = LK.import("@upit/tween.v1");
var storage = LK.import("@upit/storage.v1", {
	highscore: 0,
	weaponLevel: 1
});

/**** 
* Classes
****/ 
var Bullet = Container.expand(function (startX, startY, targetX, targetY, damage) {
	var self = Container.call(this);
	var bulletGraphic = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 15;
	self.damage = damage || 10;
	// Calculate direction vector
	var dx = targetX - startX;
	var dy = targetY - startY;
	var distance = Math.sqrt(dx * dx + dy * dy);
	self.vx = dx / distance * self.speed;
	self.vy = dy / distance * self.speed;
	self.x = startX;
	self.y = startY;
	self.update = function () {
		self.x += self.vx;
		self.y += self.vy;
		// Check if bullet is out of bounds
		if (self.x < 0 || self.x > 2048 || self.y < 0 || self.y > 2732) {
			return true; // Remove bullet
		}
		return false;
	};
	return self;
});
var Obstacle = Container.expand(function (x, y, type) {
	var self = Container.call(this);
	var obstacleGraphic = self.attachAsset(type, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.x = x;
	self.y = y;
	return self;
});
var Pickup = Container.expand(function (x, y, type) {
	var self = Container.call(this);
	var pickupGraphic = self.attachAsset(type === 'health' ? 'healthPack' : 'ammoBox', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.type = type; // 'health' or 'ammo'
	self.x = x;
	self.y = y;
	self.lifespan = 10000; // milliseconds until pickup disappears
	self.creationTime = Date.now();
	self.update = function () {
		// Make pickup pulse
		var age = Date.now() - self.creationTime;
		var pulse = Math.sin(age / 200) * 0.2 + 1;
		self.scale.set(pulse, pulse);
		// Check if pickup should expire
		if (age > self.lifespan) {
			return true; // Remove pickup
		}
		return false;
	};
	self.collect = function (player) {
		LK.getSound('pickup').play();
		if (self.type === 'health') {
			player.heal(25);
		} else if (self.type === 'ammo') {
			player.ammo = player.maxAmmo;
		}
	};
	return self;
});
var Player = Container.expand(function () {
	var self = Container.call(this);
	var playerGraphic = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 100;
	self.maxHealth = 100;
	self.ammo = 30;
	self.maxAmmo = 30;
	self.reloadTime = 1000; // milliseconds
	self.isReloading = false;
	self.speed = 7;
	self.weaponLevel = storage.weaponLevel || 1;
	self.bulletDamage = 10 * self.weaponLevel;
	self.lastShotTime = 0;
	self.shootDelay = 300; // milliseconds between shots
	self.moveTowards = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > self.speed) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		} else {
			self.x = targetX;
			self.y = targetY;
		}
		// Keep player within bounds
		self.x = Math.max(50, Math.min(2048 - 50, self.x));
		self.y = Math.max(50, Math.min(2732 - 50, self.y));
	};
	self.shoot = function (targetX, targetY) {
		var currentTime = Date.now();
		if (self.ammo <= 0) {
			self.reload();
			return null;
		}
		if (self.isReloading) {
			return null;
		}
		if (currentTime - self.lastShotTime < self.shootDelay) {
			return null;
		}
		self.lastShotTime = currentTime;
		self.ammo--;
		LK.getSound('shoot').play();
		var bullet = new Bullet(self.x, self.y, targetX, targetY, self.bulletDamage);
		return bullet;
	};
	self.reload = function () {
		if (!self.isReloading && self.ammo < self.maxAmmo) {
			self.isReloading = true;
			LK.setTimeout(function () {
				self.ammo = self.maxAmmo;
				self.isReloading = false;
			}, self.reloadTime);
		}
	};
	self.takeDamage = function (damage) {
		LK.getSound('playerHit').play();
		LK.effects.flashObject(self, 0xff0000, 300);
		self.health -= damage;
		if (self.health <= 0) {
			self.health = 0;
			return true; // player died
		}
		return false; // player still alive
	};
	self.heal = function (amount) {
		self.health = Math.min(self.maxHealth, self.health + amount);
	};
	self.upgradeWeapon = function () {
		self.weaponLevel++;
		self.bulletDamage = 10 * self.weaponLevel;
		storage.weaponLevel = self.weaponLevel;
	};
	return self;
});
var Zombie = Container.expand(function (x, y, health, speed, damage) {
	var self = Container.call(this);
	var zombieGraphic = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = health || 30;
	self.maxHealth = self.health;
	self.speed = speed || 2;
	self.damage = damage || 10;
	self.attackCooldown = 1000; // milliseconds
	self.lastAttackTime = 0;
	self.x = x;
	self.y = y;
	self.moveTowards = function (targetX, targetY) {
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance > 0) {
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
	};
	self.attack = function (player) {
		var currentTime = Date.now();
		if (currentTime - self.lastAttackTime >= self.attackCooldown) {
			self.lastAttackTime = currentTime;
			return player.takeDamage(self.damage);
		}
		return false;
	};
	self.takeDamage = function (damage) {
		self.health -= damage;
		// Flash zombie when hit
		LK.effects.flashObject(self, 0xff0000, 200);
		LK.getSound('zombieHit').play();
		// Change color based on health percentage
		var healthPercentage = self.health / self.maxHealth;
		var green = Math.floor(204 * healthPercentage);
		zombieGraphic.tint = 0 << 16 | green << 8 | 0;
		if (self.health <= 0) {
			return true; // zombie died
		}
		return false; // zombie still alive
	};
	return self;
});
var BossZombie = Zombie.expand(function (x, y, waveNumber) {
	var self = Zombie.call(this, x, y, bossHealth, bossSpeed, bossDamage);
	// Calculate boss stats based on wave number
	var bossHealth = 100 + waveNumber * 50;
	var bossSpeed = 1.5 + waveNumber * 0.1;
	var bossDamage = 20 + waveNumber * 5;
	// Replace the zombie graphic with a boss graphic
	self.removeChild(self.getChildAt(0)); // Remove the zombie graphic
	var bossGraphic = self.attachAsset('bossZombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.scoreValue = 100; // More points for killing a boss
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x111111
});

/**** 
* Game Code
****/ 
// Game state variables
var player;
var obstacles = [];
var bullets = [];
var zombies = [];
var pickups = [];
var wave = 1;
var zombiesKilled = 0;
var score = 0;
var gameStartTime;
var waveStartTime;
var isWaveActive = false;
var targetPosition = {
	x: 0,
	y: 0
};
var isGameOver = false;
// UI elements
var scoreText;
var waveText;
var healthBar;
var healthBarBg;
var ammoBar;
var ammoBarBg;
var gameStatusText;
function initGame() {
	// Reset game state
	wave = 1;
	zombiesKilled = 0;
	score = 0;
	bullets = [];
	zombies = [];
	pickups = [];
	isWaveActive = false;
	isGameOver = false;
	gameStartTime = Date.now();
	// Set background
	game.setBackgroundColor(0x111111);
	// Play background music
	LK.playMusic('gameMusic', {
		fade: {
			start: 0,
			end: 0.3,
			duration: 1000
		}
	});
	// Create player at center of screen
	player = new Player();
	player.x = 2048 / 2;
	player.y = 2732 / 2;
	if (player) {
		player.lastX = player.x; // Initialize lastX for tracking
		player.lastY = player.y; // Initialize lastY for tracking
	}
	game.addChild(player);
	// Add obstacles
	var obstacles = [];
	obstacles.push(new Obstacle(50, 50, 'crate')); // Top-left corner
	obstacles.push(new Obstacle(1998, 50, 'crate')); // Top-right corner
	obstacles.push(new Obstacle(50, 2682, 'crate')); // Bottom-left corner
	obstacles.push(new Obstacle(1998, 2682, 'crate')); // Bottom-right corner
	// Add decorative elements to the corners
	obstacles.push(new Obstacle(150, 150, 'bush')); // Near top-left corner
	obstacles.push(new Obstacle(1898, 150, 'bush')); // Near top-right corner
	obstacles.push(new Obstacle(150, 2582, 'bush')); // Near bottom-left corner
	obstacles.push(new Obstacle(1898, 2582, 'bush')); // Near bottom-right corner
	obstacles.push(new Obstacle(500, 500, 'bush'));
	obstacles.forEach(function (obstacle) {
		game.addChild(obstacle);
	});
	// Initialize UI
	createUI();
	// Start first wave
	startWave();
}
function createUI() {
	// Score text
	scoreText = new Text2('Score: 0', {
		size: 60,
		fill: 0xFFFFFF
	});
	scoreText.anchor.set(0, 0);
	LK.gui.topRight.addChild(scoreText);
	scoreText.x = -scoreText.width - 20;
	scoreText.y = 20;
	// Wave text
	waveText = new Text2('Wave: 1', {
		size: 60,
		fill: 0xFFFFFF
	});
	waveText.anchor.set(0.5, 0);
	LK.gui.top.addChild(waveText);
	waveText.y = 20;
	// Health bar background
	healthBarBg = LK.getAsset('healthBarBg', {
		anchorX: 0,
		anchorY: 0.5
	});
	LK.gui.bottomLeft.addChild(healthBarBg);
	healthBarBg.x = 20;
	healthBarBg.y = -50;
	// Health bar
	healthBar = LK.getAsset('healthBar', {
		anchorX: 0,
		anchorY: 0.5
	});
	LK.gui.bottomLeft.addChild(healthBar);
	healthBar.x = 20;
	healthBar.y = -50;
	// Ammo bar background
	ammoBarBg = LK.getAsset('ammoBarBg', {
		anchorX: 0,
		anchorY: 0.5
	});
	LK.gui.bottomLeft.addChild(ammoBarBg);
	ammoBarBg.x = 20;
	ammoBarBg.y = -100;
	// Ammo bar
	ammoBar = LK.getAsset('ammoBar', {
		anchorX: 0,
		anchorY: 0.5
	});
	LK.gui.bottomLeft.addChild(ammoBar);
	ammoBar.x = 20;
	ammoBar.y = -100;
	// Game status text (wave start, game over, etc.)
	gameStatusText = new Text2('', {
		size: 100,
		fill: 0xFFFFFF
	});
	gameStatusText.anchor.set(0.5, 0.5);
	LK.gui.center.addChild(gameStatusText);
	gameStatusText.alpha = 0;
}
function updateUI() {
	// Update score
	scoreText.setText('Score: ' + score);
	// Update wave
	waveText.setText('Wave: ' + wave);
	// Update health bar
	var healthPercent = player.health / player.maxHealth;
	healthBar.scale.x = healthPercent;
	// Update ammo bar
	var ammoPercent = player.ammo / player.maxAmmo;
	ammoBar.scale.x = ammoPercent;
	// Change ammo bar color when reloading
	if (player.isReloading) {
		ammoBar.tint = 0xff6600;
	} else {
		ammoBar.tint = 0xcc9900;
	}
}
function startWave() {
	waveStartTime = Date.now();
	isWaveActive = true;
	// Display wave start message
	gameStatusText.setText('WAVE ' + wave);
	gameStatusText.alpha = 1;
	tween(gameStatusText, {
		alpha: 0
	}, {
		duration: 1500,
		easing: tween.easeIn
	});
	LK.getSound('newWave').play();
	// Spawn zombies based on wave number
	var zombieCount = 5 + wave * 2;
	var zombieHealth = 30 + wave * 5;
	var zombieSpeed = 2 + wave * 0.1;
	var zombieDamage = 10 + wave * 2;
	// Schedule zombie spawns over time
	var spawnInterval = LK.setInterval(function () {
		if (zombies.length < zombieCount) {
			spawnZombie(zombieHealth, zombieSpeed, zombieDamage);
		} else {
			LK.clearInterval(spawnInterval);
		}
	}, 1000);
	// Spawn a boss every 5 waves
	if (wave % 5 === 0) {
		LK.setTimeout(function () {
			spawnBossZombie();
		}, 5000);
	}
}
function spawnZombie(health, speed, damage) {
	var edge = Math.floor(Math.random() * 4); // 0: top, 1: right, 2: bottom, 3: left
	var x, y;
	switch (edge) {
		case 0:
			// top
			x = Math.random() * 2048;
			y = -100;
			break;
		case 1:
			// right
			x = 2048 + 100;
			y = Math.random() * 2732;
			break;
		case 2:
			// bottom
			x = Math.random() * 2048;
			y = 2732 + 100;
			break;
		case 3:
			// left
			x = -100;
			y = Math.random() * 2732;
			break;
	}
	var zombie = new Zombie(x, y, health, speed, damage);
	zombies.push(zombie);
	game.addChild(zombie);
}
function spawnBossZombie() {
	// Spawn boss at a random edge
	var edge = Math.floor(Math.random() * 4);
	var x, y;
	switch (edge) {
		case 0:
			// top
			x = Math.random() * 2048;
			y = -150;
			break;
		case 1:
			// right
			x = 2048 + 150;
			y = Math.random() * 2732;
			break;
		case 2:
			// bottom
			x = Math.random() * 2048;
			y = 2732 + 150;
			break;
		case 3:
			// left
			x = -150;
			y = Math.random() * 2732;
			break;
	}
	var boss = new BossZombie(x, y, wave);
	zombies.push(boss);
	game.addChild(boss);
	// Play boss appear sound
	LK.getSound('bossAppear').play();
	// Show boss alert
	gameStatusText.setText('BOSS ZOMBIE APPEARED!');
	gameStatusText.alpha = 1;
	tween(gameStatusText, {
		alpha: 0
	}, {
		duration: 2000,
		easing: tween.easeIn
	});
}
function spawnPickup(x, y) {
	// 30% chance for health, 70% for ammo
	var type = Math.random() < 0.3 ? 'health' : 'ammo';
	var pickup = new Pickup(x, y, type);
	pickups.push(pickup);
	game.addChild(pickup);
}
function checkWaveCompletion() {
	if (isWaveActive && zombies.length === 0) {
		isWaveActive = false;
		// Display wave complete message
		gameStatusText.setText('WAVE ' + wave + ' COMPLETE!');
		gameStatusText.alpha = 1;
		// Give player a weapon upgrade every 3 waves
		if (wave % 3 === 0) {
			player.upgradeWeapon();
			// Show upgrade message
			LK.setTimeout(function () {
				gameStatusText.setText('WEAPON UPGRADED!');
			}, 2000);
		}
		// Start next wave after a delay
		LK.setTimeout(function () {
			wave++;
			gameStatusText.alpha = 0;
			startWave();
		}, 4000);
	}
}
// Event handling
game.down = function (x, y) {
	if (isGameOver) {
		return;
	}
	targetPosition.x = x;
	targetPosition.y = y;
	// Player shoots at clicked position
	var bullet = player.shoot(x, y);
	if (bullet) {
		bullets.push(bullet);
		game.addChild(bullet);
	}
};
game.move = function (x, y) {
	targetPosition.x = x;
	targetPosition.y = y;
};
game.up = function () {
	// Not needed for this game
};
// Main game update loop
game.update = function () {
	if (isGameOver) {
		return;
	}
	// Check for player collision with obstacles
	obstacles.forEach(function (obstacle) {
		if (player.intersects(obstacle)) {
			// Prevent player from moving through the obstacle
			player.x = player.lastX;
			player.y = player.lastY;
		}
	});
	// Update player movement
	player.lastX = player.x; // Track lastX before moving
	player.lastY = player.y; // Track lastY before moving
	player.moveTowards(targetPosition.x, targetPosition.y);
	// Update bullets
	for (var i = bullets.length - 1; i >= 0; i--) {
		var shouldRemove = bullets[i].update();
		if (shouldRemove) {
			bullets[i].destroy();
			bullets.splice(i, 1);
			continue;
		}
		// Check bullet collision with zombies
		for (var j = zombies.length - 1; j >= 0; j--) {
			if (bullets[i] && bullets[i].intersects(zombies[j])) {
				var zombieDied = zombies[j].takeDamage(bullets[i].damage);
				// Remove bullet after hit
				bullets[i].destroy();
				bullets.splice(i, 1);
				if (zombieDied) {
					// Increase score and zombie kill counter
					var scoreToAdd = zombies[j] instanceof BossZombie ? 100 : 10;
					score += scoreToAdd;
					zombiesKilled++;
					// Chance to drop pickup
					if (Math.random() < 0.3) {
						spawnPickup(zombies[j].x, zombies[j].y);
					}
					// Remove zombie
					zombies[j].destroy();
					zombies.splice(j, 1);
				}
				break;
			}
		}
	}
	// Update zombies
	for (var i = zombies.length - 1; i >= 0; i--) {
		// Move zombie towards player
		zombies[i].moveTowards(player.x, player.y);
		// Check if zombie reached player
		if (zombies[i].intersects(player)) {
			var playerDied = zombies[i].attack(player);
			if (playerDied) {
				handleGameOver();
			}
		}
	}
	// Update pickups
	for (var i = pickups.length - 1; i >= 0; i--) {
		var shouldRemove = pickups[i].update();
		if (shouldRemove) {
			pickups[i].destroy();
			pickups.splice(i, 1);
			continue;
		}
		// Check if player collects pickup
		if (player.intersects(pickups[i])) {
			pickups[i].collect(player);
			pickups[i].destroy();
			pickups.splice(i, 1);
		}
	}
	// Update UI
	updateUI();
	// Check if wave is complete
	checkWaveCompletion();
	// Auto-reload when empty and not already reloading
	if (player.ammo === 0 && !player.isReloading) {
		player.reload();
	}
};
function handleGameOver() {
	isGameOver = true;
	// Fade out background music
	LK.playMusic('gameMusic', {
		fade: {
			start: 0.3,
			end: 0,
			duration: 1000
		}
	});
	// Update high score if needed
	if (score > storage.highscore) {
		storage.highscore = score;
	}
	// Show score in game over dialog
	LK.setScore(score);
	// Show game over screen after a short delay
	LK.setTimeout(function () {
		LK.showGameOver();
	}, 1000);
}
// Pre-game screen setup
function showPreGameScreen() {
	var preGameText = new Text2('Tap to Start', {
		size: 100,
		fill: 0xFFFFFF
	});
	preGameText.anchor.set(0.5, 0.5);
	LK.gui.center.addChild(preGameText);
	// Wait for user interaction to start the game
	game.down = function () {
		LK.gui.center.removeChild(preGameText);
		game.down = originalGameDown; // Restore original game down function
		initGame(); // Start the game
	};
}
// Store the original game down function
var originalGameDown = game.down;
// Show the pre-game screen
showPreGameScreen();

===================================================================
--- original.js
+++ change.js
@@ -280,10 +280,12 @@
 	// Create player at center of screen
 	player = new Player();
 	player.x = 2048 / 2;
 	player.y = 2732 / 2;
-	player.lastX = player.x; // Initialize lastX for tracking
-	player.lastY = player.y; // Initialize lastY for tracking
+	if (player) {
+		player.lastX = player.x; // Initialize lastX for tracking
+		player.lastY = player.y; // Initialize lastY for tracking
+	}
 	game.addChild(player);
 	// Add obstacles
 	var obstacles = [];
 	obstacles.push(new Obstacle(50, 50, 'crate')); // Top-left corner