/**** 
* Classes
****/ 
var BalrogEnemy = Container.expand(function () {
	var self = Container.call(this);
	var balrogGraphics = self.attachAsset('balrogSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	balrogGraphics.scale.set(2.5);
	self.hitpoints = balrogHitpoints;
	balrogHitpoints *= 2;
	self._move_migrated = function (towers) {
		var minDist = Infinity;
		var closestTower = null;
		if (!self.game.towers) {
			self.game.towers = [];
		}
		for (var i = 0; i < self.game.towers.length; i++) {
			var dx = self.game.towers[i].x - self.x;
			var dy = self.game.towers[i].y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestTower = self.game.towers[i];
			}
		}
		if (closestTower && minDist < closestTower.width / 2 + this.width / 2) {
			closestTower.health -= 4;
			if (closestTower.health <= 0) {
				var towerIndex = self.game.towers.indexOf(closestTower);
				if (towerIndex > -1) {
					self.game.towers.splice(towerIndex, 1);
				}
				closestTower.destroy();
			}
		} else if (closestTower && minDist < 100) {
			var avoidanceForce = 8;
			var ax = this.x - closestTower.x;
			var ay = this.y - closestTower.y;
			var len = Math.sqrt(ax * ax + ay * ay);
			ax = ax / len * avoidanceForce;
			ay = ay / len * avoidanceForce;
			this.x += ax;
			this.y += ay;
		} else {
			this.zigzagCounter = this.zigzagCounter || 0;
			this.zigzagDirection = this.zigzagDirection || 1;
			if (this.zigzagCounter++ % self.zigzagTension === 0) {
				this.zigzagDirection *= -1;
			}
			this.x += 4 * this.zigzagDirection;
			this.y += 2;
			if (Math.random() < 0.01) {
				this.zigzagTension = Math.floor(Math.random() * 40) + 10;
			}
			if (this.x > 2048) {
				this.zigzagDirection = -1;
			}
			if (this.x < 0) {
				this.zigzagDirection = 1;
			}
			var scaleIncrement = (1 - 0.1) / 200;
			this.scale.x += scaleIncrement;
			this.scale.y += scaleIncrement;
			this.scale.x = Math.min(this.scale.x, 1);
			this.scale.y = Math.min(this.scale.y, 1);
			if (this.zigzagCounter % 10 == 0) {
				this.rotation = (0.5 - Math.random()) * (Math.PI * 2 / 100);
			}
		}
	};
	self.die = function () {
		playerGold += 500;
		playerScore += 10000;
		this.game.updateScoreLabel();
		this.game.updateGoldLabel();
		for (var i = 0; i < 100; i++) {
			var t = new GoldCoin(this.x, this.y, 820, 2500, i * 2);
			this.game.addChild(t);
			this.game.goldCoins.push(t);
		}
		var index = this.game.enemies.indexOf(this);
		if (index > -1) {
			this.game.enemies.splice(index, 1);
		}
		this.destroy();
	};
});
var Bullet = Container.expand(function (upgradeLevel) {
	var self = Container.call(this);
	self.game = null;
	self.upgradeLevel = upgradeLevel;
	self.damage = towerDamage[self.upgradeLevel];
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics.scale.set(0.2);
	var bulletGraphics1 = self.attachAsset('bulletSprite1', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics2 = self.attachAsset('bulletSprite2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics3 = self.attachAsset('bulletSprite3', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics4 = self.attachAsset('bulletSprite4', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics5 = self.attachAsset('bulletSprite5', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics6 = self.attachAsset('bulletSprite6', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics7 = self.attachAsset('bulletSprite7', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var bulletGraphics8 = self.attachAsset('bulletSprite8', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	bulletGraphics1.scale.set(.2);
	bulletGraphics2.scale.set(.2);
	bulletGraphics3.scale.set(.2);
	bulletGraphics4.scale.set(.2);
	bulletGraphics5.scale.set(.2);
	bulletGraphics6.scale.set(.2);
	bulletGraphics7.scale.set(.2);
	bulletGraphics8.scale.set(.2);
	bulletGraphics1.alpha = 0;
	bulletGraphics2.alpha = 0;
	bulletGraphics3.alpha = 0;
	bulletGraphics4.alpha = 0;
	bulletGraphics5.alpha = 0;
	bulletGraphics6.alpha = 0;
	bulletGraphics7.alpha = 0;
	bulletGraphics8.alpha = 0;
	var a = [bulletGraphics1, bulletGraphics2, bulletGraphics3, bulletGraphics4, bulletGraphics5, bulletGraphics6, bulletGraphics7, bulletGraphics8];
	if (self.upgradeLevel > 0) {
		bulletGraphics.alpha = 0;
		for (var i = 0; i < 8; i++) {
			if (i + 1 == self.upgradeLevel) {
				a[i].alpha = 1;
			} else {
				a[i].setAlpha = 0;
			}
		}
	}
	self.vx = 0;
	self.vy = 0;
	self._move_migrated = function () {
		if (this.target) {
			var tx = this.target.x - this.x;
			var ty = this.target.y - this.y;
			var dist = Math.sqrt(tx * tx + ty * ty);
			if (dist > 0) {
				this.x += this.vx * 10;
				this.y += this.vy * 10;
			}
			if (dist < this.width / 2 + this.target.width / 2) {
				this.hit();
			} else if (this.x < 0 || this.x > 2048 || this.y < 0 || this.y > 2732) {
				this.destroy();
			}
		}
	};
	self.hit = function () {
		this.target.hitpoints -= this.damage;
		if (this.target.hitpoints <= 0 && !this.target.dead) {
			this.target.dead = true;
			this.target.die();
		}
		this.destroy();
	};
});
var CityWall = Container.expand(function () {
	var self = Container.call(this);
	var wallGraphics = self.attachAsset('cityWallSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(wallGraphics);
});
var DeathKnightEnemy = Container.expand(function () {
	var self = Container.call(this);
	var dKnightGraphics = self.attachAsset('deathKnightSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	dKnightGraphics.scale.set(2.5);
	self.hitpoints = 100;
	self._move_migrated = function (towers) {
		var minDist = Infinity;
		var closestTower = null;
		if (!self.game.towers) {
			self.game.towers = [];
		}
		for (var i = 0; i < self.game.towers.length; i++) {
			var dx = self.game.towers[i].x - self.x;
			var dy = self.game.towers[i].y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestTower = self.game.towers[i];
			}
		}
		if (closestTower && minDist < closestTower.width / 2 + this.width / 2) {
			closestTower.health -= 1;
			if (closestTower.health <= 0) {
				var towerIndex = self.game.towers.indexOf(closestTower);
				if (towerIndex > -1) {
					self.game.towers.splice(towerIndex, 1);
				}
				closestTower.destroy();
			}
		} else if (closestTower && minDist < 100) {
			var avoidanceForce = 8;
			var ax = this.x - closestTower.x;
			var ay = this.y - closestTower.y;
			var len = Math.sqrt(ax * ax + ay * ay);
			ax = ax / len * avoidanceForce;
			ay = ay / len * avoidanceForce;
			this.x += ax;
			this.y += ay;
		} else {
			this.zigzagCounter = this.zigzagCounter || 0;
			this.zigzagDirection = this.zigzagDirection || 1;
			if (this.zigzagCounter++ % self.zigzagTension === 0) {
				this.zigzagDirection *= -1;
			}
			this.x += 4 * this.zigzagDirection;
			this.y += 2;
			if (Math.random() < 0.01) {
				this.zigzagTension = Math.floor(Math.random() * 40) + 10;
			}
			if (this.x > 2048) {
				this.zigzagDirection = -1;
			}
			if (this.x < 0) {
				this.zigzagDirection = 1;
			}
			var scaleIncrement = (1 - 0.1) / 200;
			this.scale.x += scaleIncrement;
			this.scale.y += scaleIncrement;
			this.scale.x = Math.min(this.scale.x, 1);
			this.scale.y = Math.min(this.scale.y, 1);
			if (this.zigzagCounter % 10 == 0) {
				this.rotation = (0.5 - Math.random()) * (Math.PI * 2 / 100);
			}
		}
	};
	self.die = function () {
		playerGold += 50;
		playerScore += 2222;
		this.game.updateScoreLabel();
		this.game.updateGoldLabel();
		for (var i = 0; i < 40; i++) {
			var t = new GoldCoin(this.x, this.y, 820, 2500, i * 2);
			this.game.addChild(t);
			this.game.goldCoins.push(t);
		}
		var index = this.game.enemies.indexOf(this);
		if (index > -1) {
			this.game.enemies.splice(index, 1);
		}
		this.destroy();
	};
});
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemySprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyGraphics.scale.set(0.8);
	self.hitpoints = 3;
	self.zigzagTension = Math.floor(Math.random() * 40) + 10;
	self._move_migrated = function (towers) {
		var minDist = Infinity;
		var closestTower = null;
		if (!self.game.towers) {
			self.game.towers = [];
		}
		for (var i = 0; i < self.game.towers.length; i++) {
			var dx = self.game.towers[i].x - self.x;
			var dy = self.game.towers[i].y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestTower = self.game.towers[i];
			}
		}
		if (closestTower && minDist < closestTower.width / 2 + this.width / 2) {
			closestTower.health -= 0.5;
			if (closestTower.health <= 0) {
				var towerIndex = self.game.towers.indexOf(closestTower);
				if (towerIndex > -1) {
					self.game.towers.splice(towerIndex, 1);
				}
				closestTower.destroy();
			}
		} else if (closestTower && minDist < 100) {
			var avoidanceForce = 8;
			var ax = this.x - closestTower.x;
			var ay = this.y - closestTower.y;
			var len = Math.sqrt(ax * ax + ay * ay);
			ax = ax / len * avoidanceForce;
			ay = ay / len * avoidanceForce;
			this.x += ax;
			this.y += ay;
		} else {
			this.zigzagCounter = this.zigzagCounter || 0;
			this.zigzagDirection = this.zigzagDirection || 1;
			if (this.zigzagCounter++ % self.zigzagTension === 0) {
				this.zigzagDirection *= -1;
			}
			this.x += 4 * this.zigzagDirection;
			this.y += 2;
			if (Math.random() < 0.01) {
				this.zigzagTension = Math.floor(Math.random() * 40) + 10;
			}
			if (this.x > 2048) {
				this.zigzagDirection = -1;
			}
			if (this.x < 0) {
				this.zigzagDirection = 1;
			}
			var scaleIncrement = (1 - 0.1) / 200;
			this.scale.x += scaleIncrement;
			this.scale.y += scaleIncrement;
			this.scale.x = Math.min(this.scale.x, 1);
			this.scale.y = Math.min(this.scale.y, 1);
			this.rotation = (0.5 - Math.random()) * (Math.PI * 2 / 50);
		}
	};
	self.die = function () {
		playerGold += 5;
		playerScore += 100;
		this.game.updateScoreLabel();
		this.game.updateGoldLabel();
		for (var i = 0; i < 5; i++) {
			var t = new GoldCoin(this.x, this.y, 820, 2500, i * 2);
			this.game.addChild(t);
			this.game.goldCoins.push(t);
		}
		var index = this.game.enemies.indexOf(this);
		if (index > -1) {
			this.game.enemies.splice(index, 1);
		}
		this.destroy();
	};
});
var GoldCoin = Container.expand(function (startX, startY, endX, endY, delay) {
	var self = Container.call(this);
	GoldCoin.delayIncrement = 0;
	self.game = this;
	var coinTypes = ['bulletSprite1', 'bulletSprite2', 'bulletSprite3', 'bulletSprite4', 'bulletSprite5', 'bulletSprite6', 'bulletSprite7', 'bulletSprite8'];
	var sel = coinTypes[Math.floor(Math.random() * coinTypes.length)];
	if (false) {
		var coinGraphics = self.attachAsset('goldCoinSprite', {
			anchorX: 0.5,
			anchorY: 0.5
		});
	}
	var coinGraphics = self.createAsset(sel, {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var tx = 80 / coinGraphics.width;
	coinGraphics.width = 80;
	coinGraphics.height = coinGraphics.height * tx;
	self.addChild(coinGraphics);
	self.x = startX;
	self.y = startY;
	var distance = Math.sqrt(Math.pow(endX - startX, 2) + Math.pow(endY - startY, 2));
	self.delayCounter = delay * 2;
	var duration = 60 + delay;
	var vx = (endX - startX) / duration;
	var vy = (endY - startY) / duration;
	self.alpha = 0;
	self.path = createQuadraticBezierArcPoints(startX, startY, endX, startY - 100, endX, endY, 60);
	self._move_migrated = function () {
		if (self.delayCounter > 0) {
			self.delayCounter--;
		} else {
			self.alpha = 1;
			if (self.path[duration]) {
				self.x = self.path[duration - self.delayCounter][0];
				self.y = self.path[duration - self.delayCounter][1];
			}
		}
		if (--duration <= 0) {
			self.destroy();
		}
	};
});
var OrcEnemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('orcEnemySprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	enemyGraphics.scale.set(0.8);
	self.hitpoints = 6;
	self.zigzagTension = Math.floor(Math.random() * 20) + 10;
	self._move_migrated = function (towers) {
		var minDist = Infinity;
		var closestTower = null;
		if (!self.game.towers) {
			self.game.towers = [];
		}
		for (var i = 0; i < self.game.towers.length; i++) {
			var dx = self.game.towers[i].x - self.x;
			var dy = self.game.towers[i].y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestTower = self.game.towers[i];
			}
		}
		if (closestTower && minDist < closestTower.width / 2 + this.width / 2) {
			closestTower.health -= 0.8;
			if (closestTower.health <= 0) {
				var towerIndex = self.game.towers.indexOf(closestTower);
				if (towerIndex > -1) {
					self.game.towers.splice(towerIndex, 1);
				}
				closestTower.destroy();
			}
		} else if (closestTower && minDist < 100) {
			var avoidanceForce = 8;
			var ax = this.x - closestTower.x;
			var ay = this.y - closestTower.y;
			var len = Math.sqrt(ax * ax + ay * ay);
			ax = ax / len * avoidanceForce;
			ay = ay / len * avoidanceForce;
			this.x += ax;
			this.y += ay;
		} else {
			this.zigzagCounter = this.zigzagCounter || 0;
			this.zigzagDirection = this.zigzagDirection || 1;
			if (this.zigzagCounter++ % self.zigzagTension === 0) {
				this.zigzagDirection *= -1;
			}
			this.x += 4 * this.zigzagDirection;
			this.y += 2;
			if (Math.random() < 0.01) {
				this.zigzagTension = Math.floor(Math.random() * 40) + 10;
			}
			if (this.x > 2048) {
				this.zigzagDirection = -1;
			}
			if (this.x < 0) {
				this.zigzagDirection = 1;
			}
			var scaleIncrement = (1 - 0.1) / 200;
			this.scale.x += scaleIncrement;
			this.scale.y += scaleIncrement;
			this.scale.x = Math.min(this.scale.x, 1);
			this.scale.y = Math.min(this.scale.y, 1);
			if (this.zigzagCounter % 5 == 0) {
				this.rotation = (0.5 - Math.random()) * (Math.PI * 2 / 100);
			}
		}
	};
	self.die = function () {
		playerGold += 10;
		playerScore += 150;
		this.game.updateScoreLabel();
		this.game.updateGoldLabel();
		for (var i = 0; i < 8; i++) {
			var t = new GoldCoin(this.x, this.y, 820, 2500, i * 2);
			this.game.addChild(t);
			this.game.goldCoins.push(t);
		}
		var index = this.game.enemies.indexOf(this);
		if (index > -1) {
			this.game.enemies.splice(index, 1);
		}
		this.destroy();
	};
});
var Tower = Container.expand(function (gameInstance) {
	var self = Container.call(this);
	self.game = gameInstance;
	self.upgradeLevel = upgradeLevel;
	var towerGraphics = self.attachAsset('towerSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics1 = self.attachAsset('towerSprite1', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics2 = self.attachAsset('towerSprite2', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics3 = self.attachAsset('towerSprite3', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics4 = self.attachAsset('towerSprite4', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics5 = self.attachAsset('towerSprite5', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics6 = self.attachAsset('towerSprite6', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics7 = self.attachAsset('towerSprite7', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	var towerGraphics8 = self.attachAsset('towerSprite8', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	towerGraphics.scale.set(2);
	towerGraphics1.scale.set(2);
	towerGraphics2.scale.set(2);
	towerGraphics3.scale.set(2);
	towerGraphics4.scale.set(2);
	towerGraphics5.scale.set(2);
	towerGraphics6.scale.set(2);
	towerGraphics7.scale.set(2);
	towerGraphics8.scale.set(2);
	towerGraphics1.alpha = 0;
	towerGraphics2.alpha = 0;
	towerGraphics3.alpha = 0;
	towerGraphics4.alpha = 0;
	towerGraphics5.alpha = 0;
	towerGraphics6.alpha = 0;
	towerGraphics7.alpha = 0;
	towerGraphics8.alpha = 0;
	var a = [towerGraphics1, towerGraphics2, towerGraphics3, towerGraphics4, towerGraphics5, towerGraphics6, towerGraphics7, towerGraphics8];
	if (upgradeLevel > 0) {
		towerGraphics.alpha = 0;
		for (var i = 0; i < 8; i++) {
			if (i + 1 == upgradeLevel) {
				a[i].alpha = 1;
			} else {
				a[i].alpha = 0;
			}
		}
	}
	self.shoot = function (enemies) {
		if (self.shootCounter++ % towerShotDelay[self.upgradeLevel] === 0) {
			for (var i = 0; i < enemies.length; i++) {
				var enemy = enemies[i];
				var dx = enemy.x - self.x;
				var dy = enemy.y - self.y;
				var distance = Math.sqrt(dx * dx + dy * dy);
				if (distance <= 300) {
					console.log('shot');
					var bullet = new Bullet(self.upgradeLevel);
					bullet.x = self.x;
					bullet.y = self.y;
					bullet.target = enemy;
					var tx = bullet.target.x - bullet.x;
					var ty = bullet.target.y - bullet.y;
					var rad = Math.atan2(ty, tx);
					bullet.rotation = rad + Math.PI / 2;
					bullet.vx = Math.cos(rad);
					bullet.vy = Math.sin(rad);
					self.game.addBullet(bullet);
					break;
				}
			}
		}
	};
	self.upgrade = function () {};
	self.shootCounter = 0;
	self.health = 200;
});
var TreasureChest = Container.expand(function () {
	var self = Container.call(this);
	var chestGraphics = self.attachAsset('treasureChestSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(chestGraphics);
});
var TrollEnemy = Container.expand(function () {
	var self = Container.call(this);
	var trollGraphics = self.attachAsset('trollSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	trollGraphics.scale.set(2);
	self.hitpoints = 30;
	self._move_migrated = function (towers) {
		var minDist = Infinity;
		var closestTower = null;
		if (!self.game.towers) {
			self.game.towers = [];
		}
		for (var i = 0; i < self.game.towers.length; i++) {
			var dx = self.game.towers[i].x - self.x;
			var dy = self.game.towers[i].y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < minDist) {
				minDist = dist;
				closestTower = self.game.towers[i];
			}
		}
		if (closestTower && minDist < closestTower.width / 2 + this.width / 2) {
			closestTower.health -= 0.5;
			if (closestTower.health <= 0) {
				var towerIndex = self.game.towers.indexOf(closestTower);
				if (towerIndex > -1) {
					self.game.towers.splice(towerIndex, 1);
				}
				closestTower.destroy();
			}
		} else if (closestTower && minDist < 100) {
			var avoidanceForce = 8;
			var ax = this.x - closestTower.x;
			var ay = this.y - closestTower.y;
			var len = Math.sqrt(ax * ax + ay * ay);
			ax = ax / len * avoidanceForce;
			ay = ay / len * avoidanceForce;
			this.x += ax;
			this.y += ay;
		} else {
			this.zigzagCounter = this.zigzagCounter || 0;
			this.zigzagDirection = this.zigzagDirection || 1;
			if (this.zigzagCounter++ % self.zigzagTension === 0) {
				this.zigzagDirection *= -1;
			}
			this.x += 4 * this.zigzagDirection;
			this.y += 2;
			if (Math.random() < 0.01) {
				this.zigzagTension = Math.floor(Math.random() * 40) + 10;
			}
			if (this.x > 2048) {
				this.zigzagDirection = -1;
			}
			if (this.x < 0) {
				this.zigzagDirection = 1;
			}
			var scaleIncrement = (1 - 0.1) / 200;
			this.scale.x += scaleIncrement;
			this.scale.y += scaleIncrement;
			this.scale.x = Math.min(this.scale.x, 1);
			this.scale.y = Math.min(this.scale.y, 1);
			if (this.zigzagCounter % 5 == 0) {
				this.rotation = (0.5 - Math.random()) * (Math.PI * 2 / 100);
			}
		}
	};
	self.die = function () {
		playerGold += 20;
		playerScore += 300;
		this.game.updateScoreLabel();
		this.game.updateGoldLabel();
		for (var i = 0; i < 20; i++) {
			var t = new GoldCoin(this.x, this.y, 820, 2500, i * 2);
			this.game.addChild(t);
			this.game.goldCoins.push(t);
		}
		var index = this.game.enemies.indexOf(this);
		if (index > -1) {
			this.game.enemies.splice(index, 1);
		}
		this.destroy();
	};
});
var UpgradeButton = Container.expand(function () {
	var self = Container.call(this);
	var upgradeButtonGraphics = self.attachAsset('buttonSprite', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.addChild(upgradeButtonGraphics);
});

/**** 
* Initialize Game
****/ 
var game = new LK.Game({
	backgroundColor: 0x000000
});

/**** 
* Game Code
****/ 
var playerGold = 30;
var playerScore = 0;
var enemySpawnDelay = 120;
var upgradeLevel = 0;
var upgradeCost = 100;
var towerDamage = [1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 8];
var towerShotDelay = [50, 45, 45, 40, 35, 30, 25, 20, 15];
var balrogHitpoints = 500;
var lerp = function lerp(start, end, t) {
	return start * (1 - t) + end * t;
};
var createQuadraticBezierArcPoints = function createQuadraticBezierArcPoints(p0x, p0y, p1x, p1y, p2x, p2y, numberOfSteps) {
	var points_along_axis = new Array(numberOfSteps).fill(null).map(function () {
		return [0, 0];
	});
	var stepping_constant = 1 / numberOfSteps;
	for (var i = 0; i < numberOfSteps; i++) {
		var i_p0_p1x = lerp(p0x, p1x, i * stepping_constant);
		var i_p0_p1y = lerp(p0y, p1y, i * stepping_constant);
		var i_p1_p2x = lerp(p1x, p2x, i * stepping_constant);
		var i_p1_p2y = lerp(p1y, p2y, i * stepping_constant);
		if (false) {
			points_along_axis.push(lerp(i_p0_p1x, i_p1_p2x, i * stepping_constant), lerp(i_p0_p1y, i_p1_p2y, i * stepping_constant));
		}
		points_along_axis[i][0] = lerp(i_p0_p1x, i_p1_p2x, i * stepping_constant);
		points_along_axis[i][1] = lerp(i_p0_p1y, i_p1_p2y, i * stepping_constant);
	}
	if (false) {
		console.log('path: ' + points_along_axis);
		console.log('path[2]: ' + points_along_axis[2]);
	}
	return points_along_axis.reverse();
};
var temp = createQuadraticBezierArcPoints(0, 0, 50, 50, 0, 50, 10);
game.updateGoldLabel = function () {
	goldLabel.setText('Presents: ' + playerGold);
};
game.updateScoreLabel = function () {
	scoreLabel.setText('Score: ' + playerScore);
};
game.updateCostLabel = function () {
	costLabel.setText('Cost: ' + upgradeCost);
};
game.playerGold = 0;
game.addBullet = function (bullet) {
	bullets.push(bullet);
	game.addChild(bullet);
};
game.sufficientDistanceToOtherTowers = function (position) {
	for (var i = 0; i < game.towers.length; i++) {
		var tower = game.towers[i];
		var dx = tower.x - position.x;
		var dy = tower.y - position.y;
		var distance = Math.sqrt(dx * dx + dy * dy);
		if (distance < 120) {
			return false;
		}
	}
	return true;
};
var background = game.attachAsset('background', {});
background.width = 2548;
background.height = 3732;
background.y = -400;
background.x = -300;
game.addChildAt(background, 0);
game.towers = []; // Initialize towers array to prevent undefined errors
game.enemies = [];
var bullets = [];
game.goldCoins = [];
var selectedTowerType = null;
var initialEnemy = new Enemy();
initialEnemy.__game = game;
initialEnemy.x = 300 + Math.random() * (1848 - 300);
initialEnemy.y = 200;
initialEnemy.scale.set(0.1);
game.enemies.push(initialEnemy);
game.addChild(initialEnemy);
LK.on('tick', function () {
	game.enemySpawnCounter = game.enemySpawnCounter || 0;
	game.totalEnemiesSpawned = game.totalEnemiesSpawned || 0;
	if (++game.enemySpawnCounter >= enemySpawnDelay) {
		var newEnemy;
		if (game.totalEnemiesSpawned > 200 && game.totalEnemiesSpawned % 199 == 0) {
			newEnemy = new BalrogEnemy();
		} else if (game.totalEnemiesSpawned > 3 && game.totalEnemiesSpawned % 50 == 0) {
			newEnemy = new DeathKnightEnemy();
		} else if (game.totalEnemiesSpawned > 3 && game.totalEnemiesSpawned % 10 == 0) {
			newEnemy = new TrollEnemy();
		} else {
			if (Math.random() < 0.2 + upgradeLevel * 0.06) {
				newEnemy = new OrcEnemy();
			} else {
				newEnemy = new Enemy();
			}
		}
		if (newEnemy) {
			newEnemy.__game = game;
			newEnemy.x = 300 + Math.random() * (1848 - 300);
			newEnemy.y = 200;
			newEnemy.scale.set(0.1);
			game.enemies.push(newEnemy);
			game.addChild(newEnemy);
		}
		game.totalEnemiesSpawned++;
		if (game.totalEnemiesSpawned > 0 && game.totalEnemiesSpawned % 20 == 0) {
			enemySpawnDelay -= 4;
			if (enemySpawnDelay < 20) {
				enemySpawnDelay = 20;
			}
		}
		game.enemySpawnCounter = 0;
	}
	for (var i = 0; i < game.enemies.length; i++) {
		game.enemies[i]._move_migrated();
		if (game.enemies[i].y >= 2332 - game.enemies[i].height / 2) {
			LK.showGameOver();
		}
	}
	for (var j = 0; j < game.towers.length; j++) {
		game.towers[j].shoot(game.enemies);
	}
	for (var k = bullets.length - 1; k >= 0; k--) {
		bullets[k]._move_migrated();
		if (!bullets[k].parent) {
			bullets.splice(k, 1);
		}
	}
	for (var l = game.goldCoins.length - 1; l >= 0; l--) {
		game.goldCoins[l]._move_migrated();
		if (!game.goldCoins[l].parent) {
			game.goldCoins.splice(l, 1);
		}
	}
});
game.on('down', function (x, y, obj) {
	var position = game.toLocal(obj.global);
	if (position.y >= 600 && position.y <= 2112) {
		if (playerGold >= 10) {
			if (game.sufficientDistanceToOtherTowers(position)) {
				playerGold -= 10;
				var newTower = game.addChild(new Tower(game));
				newTower.x = position.x;
				newTower.y = position.y;
				game.towers.push(newTower);
				game.towers.sort(function (a, b) {
					return a.y - b.y;
				});
				game.towers.forEach(function (tower, index) {
					game.addChildAt(tower, 6 + index);
				});
				game.updateGoldLabel();
			}
		}
	}
});
game.on('move', function (x, y, obj) {});
game.on('up', function (x, y, obj) {});
var cityWall2 = game.addChild(new CityWall());
cityWall2.y = 2432;
cityWall2.x = 365;
cityWall2.scale.y = 0.3;
cityWall2.scale.x = 0.4;
var cityWall3 = game.addChild(new CityWall());
cityWall3.y = 2432;
cityWall3.x = 1700;
cityWall3.scale.y = 0.3;
cityWall3.scale.x = 0.4;
var cityWall = game.addChild(new CityWall());
cityWall.y = 2432;
cityWall.x = 1035;
cityWall.scale.y = 0.3;
cityWall.scale.x = 0.5;
var bottomBlackBox = game.attachAsset('blackBox', {
	anchorY: 1
});
bottomBlackBox.width = 2720;
bottomBlackBox.height = 500;
bottomBlackBox.y = 2802;
bottomBlackBox.x = -630;
game.addChild(bottomBlackBox);
var goldLabel = new Text2('Presents: 30', {
	size: 100,
	fill: '#ffd700',
	align: 'left',
	dropShadow: true
});
goldLabel.x = 120;
goldLabel.y = 2702 - bottomBlackBox.height + (bottomBlackBox.height - goldLabel.height) / 2;
game.addChild(goldLabel);
var scoreLabel = new Text2('Score: 0', {
	size: 100,
	fill: '#ccbbff',
	align: 'left',
	dropShadow: true
});
scoreLabel.x = 120;
scoreLabel.y = 2822 - bottomBlackBox.height + (bottomBlackBox.height - scoreLabel.height) / 2;
game.addChild(scoreLabel);
var instructionLabel = new Text2("Tap to build towers (cost 10 presents)\nDon't let enemies reach the wall!", {
	size: 58,
	fill: '#88aaee',
	align: 'left',
	dropShadow: true
});
instructionLabel.x = 920;
instructionLabel.y = 2700 - bottomBlackBox.height + (bottomBlackBox.height - instructionLabel.height) / 2;
game.addChild(instructionLabel);
var treasureChest = game.addChild(new TreasureChest());
treasureChest.scale.x = 1.6;
treasureChest.scale.y = 1.6;
treasureChest.x = 820;
treasureChest.y = goldLabel.y + 65;
var upgradeButton = game.addChild(new UpgradeButton());
upgradeButton.x = 1500;
upgradeButton.y = 2590;
upgradeButton.scale.x = 1.2;
upgradeButton.scale.y = 1.2;
game.upgradeLabel = new Text2("Upgrade Towers:", {
	size: 58,
	fill: '#dddddd',
	align: 'left',
	dropShadow: true
});
game.upgradeLabel.x = 920;
game.upgradeLabel.y = 2552;
game.addChild(game.upgradeLabel);
var costLabel = new Text2("Cost: 100", {
	size: 58,
	fill: '#dddd00',
	align: 'left',
	dropShadow: true
});
costLabel.x = 1600;
costLabel.y = 2552;
game.addChild(costLabel);
game.upgradeTowers = function () {
	if (playerGold >= upgradeCost) {
		playerGold -= upgradeCost;
		upgradeLevel += 1;
		upgradeCost = Math.floor(upgradeCost * 1.5);
		game.updateGoldLabel();
		game.updateCostLabel();
		if (upgradeLevel == 8) {
			game.upgradeLabel.setText('All upgraded - Go for the High Score!');
			if (upgradeButton) {
				upgradeButton.destroy();
				upgradeButton = null;
			}
			if (costLabel) {
				costLabel.destroy();
				costLabel = null;
			}
		}
	}
};
upgradeButton.on('down', function (x, y, obj) {
	obj.event = obj;
	game.upgradeTowers(obj);
});

===================================================================
--- original.js
+++ change.js
@@ -764,9 +764,9 @@
 background.height = 3732;
 background.y = -400;
 background.x = -300;
 game.addChildAt(background, 0);
-game.towers = [];
+game.towers = []; // Initialize towers array to prevent undefined errors
 game.enemies = [];
 var bullets = [];
 game.goldCoins = [];
 var selectedTowerType = null;