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

/**** 
* Classes
****/ 
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 15;
	self.velocityX = 0;
	self.velocityY = 0;
	self.damage = 20;
	self.lifespan = 60; // Frames until bullet is destroyed
	self.update = function () {
		self.x += self.velocityX;
		self.y += self.velocityY;
		self.lifespan--;
		if (self.lifespan <= 0) {
			self.destroy();
			var index = game.bullets.indexOf(self);
			if (index !== -1) {
				game.bullets.splice(index, 1);
			}
			return;
		}
		// Check collision with zombies
		for (var i = 0; i < game.zombies.length; i++) {
			var zombie = game.zombies[i];
			if (zombie.isAlive && self.intersects(zombie)) {
				zombie.takeDamage(self.damage);
				LK.getSound('zombieHit').play();
				// Remove bullet
				self.destroy();
				var bulletIndex = game.bullets.indexOf(self);
				if (bulletIndex !== -1) {
					game.bullets.splice(bulletIndex, 1);
				}
				return;
			}
		}
		// Check collision with walls
		for (var j = 0; j < game.walls.length; j++) {
			var wall = game.walls[j];
			if (self.intersects(wall)) {
				// Remove bullet
				self.destroy();
				var bulletWallIndex = game.bullets.indexOf(self);
				if (bulletWallIndex !== -1) {
					game.bullets.splice(bulletWallIndex, 1);
				}
				return;
			}
		}
	};
	return self;
});
var Entity = Container.expand(function () {
	var self = Container.call(this);
	self.speed = 0;
	self.health = 100;
	self.maxHealth = 100;
	self.angle = 0;
	self.isAlive = true;
	// Create health bar background
	var healthBarBg = self.attachAsset('healthBarBg', {
		anchorX: 0.5,
		anchorY: 0,
		y: -40
	});
	// Create health bar
	var healthBar = self.attachAsset('healthBar', {
		anchorX: 0.5,
		anchorY: 0,
		y: -40
	});
	self.updateHealthBar = function () {
		var healthPercentage = self.health / self.maxHealth;
		healthBar.scale.x = healthPercentage;
		if (healthPercentage > 0.6) {
			healthBar.tint = 0x00ff00; // Green
		} else if (healthPercentage > 0.3) {
			healthBar.tint = 0xffff00; // Yellow
		} else {
			healthBar.tint = 0xff0000; // Red
		}
	};
	self.takeDamage = function (amount) {
		if (!self.isAlive) {
			return;
		}
		self.health -= amount;
		if (self.health <= 0) {
			self.health = 0;
			self.die();
		}
		self.updateHealthBar();
		LK.effects.flashObject(self, 0xff0000, 200);
	};
	self.die = function () {
		self.isAlive = false;
		self.visible = false;
		self.healthBar = null;
		self.healthBarBg = null;
	};
	self.updateHealthBar();
	return self;
});
var Zombie = Entity.expand(function () {
	var self = Entity.call(this);
	var zombieGraphics = self.attachAsset('zombie', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.damage = 10;
	self.attackCooldown = 0;
	self.attackDelay = 30;
	self.scoreValue = 10;
	self.update = function () {
		if (!self.isAlive) {
			return;
		}
		// Get the player position
		var player = game.player;
		if (!player.isAlive) {
			return;
		}
		// Calculate direction to player
		var dx = player.x - self.x;
		var dy = player.y - self.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		// Check for walls and try to navigate around them
		var canMoveDirectly = true;
		for (var i = 0; i < game.walls.length; i++) {
			var wall = game.walls[i];
			// Simple collision avoidance by checking if the wall is between zombie and player
			var wallToPLayerDist = Math.sqrt(Math.pow(player.x - wall.x, 2) + Math.pow(player.y - wall.y, 2));
			var zombieToWallDist = Math.sqrt(Math.pow(self.x - wall.x, 2) + Math.pow(self.y - wall.y, 2));
			if (zombieToWallDist < 80 && zombieToWallDist < wallToPLayerDist) {
				// Wall is between zombie and player, try to move around it
				canMoveDirectly = false;
				// Simple avoidance by moving perpendicular to the wall
				var perpX = -(player.y - self.y);
				var perpY = player.x - self.x;
				var perpMag = Math.sqrt(perpX * perpX + perpY * perpY);
				if (perpMag > 0) {
					var moveX = perpX / perpMag * self.speed;
					var moveY = perpY / perpMag * self.speed;
					self.x += moveX;
					self.y += moveY;
				}
				break;
			}
		}
		if (canMoveDirectly && distance > 0) {
			// Move towards player
			self.x += dx / distance * self.speed;
			self.y += dy / distance * self.speed;
		}
		// Attack cooldown
		if (self.attackCooldown > 0) {
			self.attackCooldown--;
		}
		// Check if close enough to attack player
		if (distance < 70 && self.attackCooldown === 0) {
			self.attack(player);
		}
	};
	self.attack = function (target) {
		target.takeDamage(self.damage);
		self.attackCooldown = self.attackDelay;
		LK.getSound('playerHit').play();
	};
	self.die = function () {
		if (typeof Entity.prototype.die === 'function') {
			Entity.prototype.die.call(this);
		} else {
			console.error("Entity.prototype.die is not defined");
		}
		// Drop resource with 30% chance
		if (Math.random() < 0.3) {
			var resource = new Resource();
			resource.x = self.x;
			resource.y = self.y;
			resource.value = Math.floor(Math.random() * 3) + 1;
			game.resources.push(resource);
			game.addChild(resource);
		}
		// Increase score
		game.increaseScore(self.scoreValue);
		// Remove from zombies array
		var index = game.zombies.indexOf(self);
		if (index !== -1) {
			game.zombies.splice(index, 1);
		}
	};
	return self;
});
var Wall = Entity.expand(function () {
	var self = Entity.call(this);
	var wallGraphics = self.attachAsset('wall', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.health = 150;
	self.maxHealth = 150;
	self.updateHealthBar();
	return self;
});
var Player = Entity.expand(function () {
	var self = Entity.call(this);
	var playerGraphics = self.attachAsset('player', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 5;
	self.shootCooldown = 0;
	self.shootDelay = 10;
	self.resources = 0;
	self.damage = 20;
	self.targetX = 0;
	self.targetY = 0;
	self.isMoving = false;
	self.update = function () {
		if (!self.isAlive) {
			return;
		}
		// Movement
		if (self.isMoving) {
			var dx = self.targetX - self.x;
			var dy = self.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 = self.targetX;
				self.y = self.targetY;
				self.isMoving = false;
			}
		}
		// Shooting cooldown
		if (self.shootCooldown > 0) {
			self.shootCooldown--;
		}
	};
	self.shoot = function (targetX, targetY) {
		if (!self.isAlive || self.shootCooldown > 0) {
			return;
		}
		var bullet = new Bullet();
		bullet.x = self.x;
		bullet.y = self.y;
		// Calculate direction
		var dx = targetX - self.x;
		var dy = targetY - self.y;
		var magnitude = Math.sqrt(dx * dx + dy * dy);
		bullet.velocityX = dx / magnitude * bullet.speed;
		bullet.velocityY = dy / magnitude * bullet.speed;
		bullet.rotation = Math.atan2(dy, dx);
		bullet.damage = self.damage;
		game.bullets.push(bullet);
		game.addChild(bullet);
		self.shootCooldown = self.shootDelay;
		LK.getSound('shoot').play();
	};
	self.collectResource = function (resource) {
		self.resources += resource.value;
		game.updateResourceText();
		LK.getSound('collect').play();
	};
	self.buildWall = function () {
		if (self.resources >= 10) {
			var wall = new Wall();
			wall.x = self.x;
			wall.y = self.y;
			// Check if wall overlaps with player or other walls
			var canBuild = true;
			if (wall.intersects(self)) {
				canBuild = false;
			}
			for (var i = 0; i < game.walls.length; i++) {
				if (wall.intersects(game.walls[i])) {
					canBuild = false;
					break;
				}
			}
			if (canBuild) {
				game.walls.push(wall);
				game.addChild(wall);
				self.resources -= 10;
				game.updateResourceText();
				LK.getSound('build').play();
			} else {
				wall.destroy();
			}
		}
	};
	return self;
});
var Resource = Container.expand(function () {
	var self = Container.call(this);
	var resourceGraphics = self.attachAsset('resource', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.value = 1;
	self.pulse = function () {
		tween(self, {
			scaleX: 1.2,
			scaleY: 1.2
		}, {
			duration: 500,
			easing: tween.easeInOut,
			onFinish: function onFinish() {
				tween(self, {
					scaleX: 1,
					scaleY: 1
				}, {
					duration: 500,
					easing: tween.easeInOut,
					onFinish: self.pulse
				});
			}
		});
	};
	self.pulse();
	return self;
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x2e2e2e
});

/**** 
* Game Code
****/ 
// Game state variables
game.player = null;
game.zombies = [];
game.bullets = [];
game.resources = [];
game.walls = [];
game.wave = 1;
game.zombiesInWave = 5;
game.zombiesSpawned = 0;
game.waveActive = false;
game.spawnTimer = 0;
game.spawnDelay = 60;
game.score = 0;
game.gameStarted = false;
// Initialize game ground
var ground = LK.getAsset('ground', {
	anchorX: 0.5,
	anchorY: 0.5,
	x: 2048 / 2,
	y: 2732 / 2,
	alpha: 0.5
});
game.addChild(ground);
// Initialize UI elements
var scoreText = new Text2('Score: 0', {
	size: 50,
	fill: 0xFFFFFF
});
scoreText.anchor.set(0, 0);
LK.gui.topRight.addChild(scoreText);
scoreText.x = -200;
scoreText.y = 50;
var waveText = new Text2('Wave: 1', {
	size: 50,
	fill: 0xFFFFFF
});
waveText.anchor.set(0, 0);
LK.gui.topRight.addChild(waveText);
waveText.x = -200;
waveText.y = 110;
var resourceText = new Text2('Resources: 0', {
	size: 50,
	fill: 0xFFFFFF
});
resourceText.anchor.set(0, 0);
LK.gui.topRight.addChild(resourceText);
resourceText.x = -300;
resourceText.y = 170;
var healthText = new Text2('Health: 100', {
	size: 50,
	fill: 0xFFFFFF
});
healthText.anchor.set(0, 0);
LK.gui.topRight.addChild(healthText);
healthText.x = -250;
healthText.y = 230;
var startText = new Text2('Tap to Start', {
	size: 80,
	fill: 0xFFFFFF
});
startText.anchor.set(0.5, 0.5);
LK.gui.center.addChild(startText);
var buildWallText = new Text2('Build Wall (10 Resources)', {
	size: 40,
	fill: 0xFFFFFF
});
buildWallText.anchor.set(0.5, 0);
LK.gui.bottom.addChild(buildWallText);
buildWallText.y = -100;
buildWallText.visible = false;
// Helper functions for UI updates
game.updateScoreText = function () {
	scoreText.setText('Score: ' + game.score);
};
game.updateWaveText = function () {
	waveText.setText('Wave: ' + game.wave);
};
game.updateResourceText = function () {
	resourceText.setText('Resources: ' + game.player.resources);
};
game.updateHealthText = function () {
	healthText.setText('Health: ' + game.player.health);
};
game.increaseScore = function (amount) {
	game.score += amount;
	game.updateScoreText();
	// Update high score if needed
	if (game.score > storage.highScore) {
		storage.highScore = game.score;
	}
};
// Game initialization function
game.startGame = function () {
	if (game.gameStarted) {
		return;
	}
	game.gameStarted = true;
	startText.visible = false;
	buildWallText.visible = true;
	// Create player
	game.player = new Player();
	game.player.x = 2048 / 2;
	game.player.y = 2732 / 2;
	game.addChild(game.player);
	// Start first wave
	game.startWave();
	// Play background music
	LK.playMusic('bgmusic');
};
// Wave management
game.startWave = function () {
	game.waveActive = true;
	game.zombiesSpawned = 0;
	game.spawnTimer = 0;
	game.zombiesInWave = 5 + (game.wave - 1) * 3;
	game.updateWaveText();
	// Show wave number
	var waveAnnouncement = new Text2('Wave ' + game.wave, {
		size: 120,
		fill: 0xFF0000
	});
	waveAnnouncement.anchor.set(0.5, 0.5);
	LK.gui.center.addChild(waveAnnouncement);
	// Animate and remove after 2 seconds
	tween(waveAnnouncement, {
		alpha: 0
	}, {
		duration: 2000,
		onFinish: function onFinish() {
			waveAnnouncement.destroy();
		}
	});
};
game.waveCompleted = function () {
	game.waveActive = false;
	game.wave++;
	// Spawn resources as reward
	for (var i = 0; i < 3; i++) {
		var resource = new Resource();
		resource.x = Math.random() * 1800 + 124;
		resource.y = Math.random() * 2500 + 116;
		resource.value = Math.floor(Math.random() * 3) + 2;
		game.resources.push(resource);
		game.addChild(resource);
	}
	// Start next wave after delay
	LK.setTimeout(function () {
		game.startWave();
	}, 5000);
	// Show wave completed
	var completedText = new Text2('Wave Completed!', {
		size: 80,
		fill: 0x00FF00
	});
	completedText.anchor.set(0.5, 0.5);
	LK.gui.center.addChild(completedText);
	// Animate and remove after 2 seconds
	tween(completedText, {
		alpha: 0
	}, {
		duration: 2000,
		onFinish: function onFinish() {
			completedText.destroy();
		}
	});
};
// Spawn a zombie at a random edge position
game.spawnZombie = function () {
	var zombie = new Zombie();
	// Determine spawn position at the edge of the screen
	var side = Math.floor(Math.random() * 4);
	switch (side) {
		case 0:
			// Top
			zombie.x = Math.random() * 2048;
			zombie.y = -50;
			break;
		case 1:
			// Right
			zombie.x = 2048 + 50;
			zombie.y = Math.random() * 2732;
			break;
		case 2:
			// Bottom
			zombie.x = Math.random() * 2048;
			zombie.y = 2732 + 50;
			break;
		case 3:
			// Left
			zombie.x = -50;
			zombie.y = Math.random() * 2732;
			break;
	}
	// Add to game
	game.zombies.push(zombie);
	game.addChild(zombie);
	game.zombiesSpawned++;
};
// Input handling
game.down = function (x, y, obj) {
	if (!game.gameStarted) {
		game.startGame();
		return;
	}
	if (!game.player || !game.player.isAlive) {
		return;
	}
	// Check if the bottom button was clicked
	var localPos = buildWallText.toGlobal({
		x: 0,
		y: 0
	});
	var textBounds = {
		x: localPos.x - buildWallText.width / 2,
		y: localPos.y,
		width: buildWallText.width,
		height: buildWallText.height
	};
	if (x >= textBounds.x && x <= textBounds.x + textBounds.width && y >= textBounds.y && y <= textBounds.y + textBounds.height) {
		// Build wall button clicked
		game.player.buildWall();
		return;
	}
	// Move player to clicked position
	game.player.targetX = x;
	game.player.targetY = y;
	game.player.isMoving = true;
	// Also shoot towards that direction
	game.player.shoot(x, y);
};
// Auto shooting at nearest zombie when not moving
game.autoShoot = function () {
	if (!game.player || !game.player.isAlive || game.player.isMoving) {
		return;
	}
	// Find closest zombie
	var closestZombie = null;
	var closestDistance = Infinity;
	for (var i = 0; i < game.zombies.length; i++) {
		var zombie = game.zombies[i];
		if (!zombie.isAlive) {
			continue;
		}
		var distance = Math.sqrt(Math.pow(zombie.x - game.player.x, 2) + Math.pow(zombie.y - game.player.y, 2));
		if (distance < closestDistance) {
			closestDistance = distance;
			closestZombie = zombie;
		}
	}
	// Shoot at closest zombie if in range
	if (closestZombie && closestDistance < 800) {
		game.player.shoot(closestZombie.x, closestZombie.y);
	}
};
// Collision detection for resources
game.checkResourceCollection = function () {
	if (!game.player || !game.player.isAlive) {
		return;
	}
	for (var i = game.resources.length - 1; i >= 0; i--) {
		var resource = game.resources[i];
		if (game.player.intersects(resource)) {
			game.player.collectResource(resource);
			resource.destroy();
			game.resources.splice(i, 1);
		}
	}
};
// Game update function
game.update = function () {
	// Don't update if game hasn't started
	if (!game.gameStarted) {
		return;
	}
	// If player is dead, show game over
	if (game.player && !game.player.isAlive) {
		LK.showGameOver();
		return;
	}
	// Update health text
	if (game.player) {
		game.updateHealthText();
	}
	// Update all game entities
	if (game.player) {
		game.player.update();
	}
	// Update zombies
	for (var i = 0; i < game.zombies.length; i++) {
		if (game.zombies[i].isAlive) {
			game.zombies[i].update();
		}
	}
	// Update bullets
	for (var j = 0; j < game.bullets.length; j++) {
		game.bullets[j].update();
	}
	// Check for resource collection
	game.checkResourceCollection();
	// Auto shoot if not moving
	if (LK.ticks % 15 === 0) {
		game.autoShoot();
	}
	// Spawn zombies during active wave
	if (game.waveActive && game.zombiesSpawned < game.zombiesInWave) {
		game.spawnTimer++;
		if (game.spawnTimer >= game.spawnDelay) {
			game.spawnZombie();
			game.spawnTimer = 0;
		}
	}
	// Check if wave is complete
	if (game.waveActive && game.zombiesSpawned >= game.zombiesInWave && game.zombies.length === 0) {
		game.waveCompleted();
	}
};

===================================================================
--- original.js
+++ change.js
@@ -180,9 +180,13 @@
 		self.attackCooldown = self.attackDelay;
 		LK.getSound('playerHit').play();
 	};
 	self.die = function () {
-		Entity.prototype.die.call(this);
+		if (typeof Entity.prototype.die === 'function') {
+			Entity.prototype.die.call(this);
+		} else {
+			console.error("Entity.prototype.die is not defined");
+		}
 		// Drop resource with 30% chance
 		if (Math.random() < 0.3) {
 			var resource = new Resource();
 			resource.x = self.x;