/**** 
* Classes
****/ 
// Bullet class
var Bullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('bullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 10;
	self.target = null;
	self.update = function () {
		if (self.target) {
			var dx = self.target.x - self.x;
			var dy = self.target.y - self.y;
			var dist = Math.sqrt(dx * dx + dy * dy);
			if (dist < self.speed) {
				self.target.health -= 10;
				if (self.target.health <= 0) {
					self.target.destroy();
				}
				self.destroy();
			} else {
				self.x += dx / dist * self.speed;
				self.y += dy / dist * self.speed;
			}
		} else {
			self.destroy();
		}
	};
});
// Enemy class
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 2;
	self.health = 100;
	self.update = function () {
		self.y += self.speed;
		if (self.y > 2732) {
			self.destroy();
			missedEnemies.push(self);
			updateMissedEnemiesList();
			if (missedEnemies.length > 10) {
				gameOver();
			}
		}
	};
});
//<Assets used in the game will automatically appear here>
// Tower class
var Tower = Container.expand(function () {
	var self = Container.call(this);
	var towerGraphics = self.attachAsset('tower', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.range = 600 * 5;
	self.fireRate = 60;
	self.fireCooldown = 0;
	self.update = function () {
		if (self.fireCooldown > 0) {
			self.fireCooldown--;
		} else {
			var target = findClosestEnemy(self);
			if (target) {
				fireBullet(self, target);
				self.fireCooldown = self.fireRate;
			}
		}
	};
});

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

/**** 
* Game Code
****/ 
// Initialize arrays and variables
var towers = [];
var enemies = [];
var bullets = [];
var score = 0;
var baseHealth = 100;
var missedEnemies = [];
var missedEnemiesTxt = new Text2('Missed Enemies: 0', {
	size: 50,
	fill: 0xFFFFFF
});
missedEnemiesTxt.anchor.set(0.5, 0);
LK.gui.bottom.addChild(missedEnemiesTxt);
// Create score text
var scoreTxt = new Text2('Score: 0', {
	size: 50,
	fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create base health text
var healthTxt = new Text2('Base Health: 100', {
	size: 50,
	fill: 0xFFFFFF
});
healthTxt.anchor.set(0.5, 0);
LK.gui.topRight.addChild(healthTxt);
// Function to find the closest enemy to a tower
function findClosestEnemy(tower) {
	var closest = null;
	var closestDist = tower.range;
	for (var i = 0; i < enemies.length; i++) {
		var enemy = enemies[i];
		var dx = enemy.x - tower.x;
		var dy = enemy.y - tower.y;
		var dist = Math.sqrt(dx * dx + dy * dy);
		if (dist < closestDist) {
			closest = enemy;
			closestDist = dist;
		}
	}
	return closest;
}
// Function to fire a bullet from a tower to a target
function fireBullet(tower, target) {
	var bullet = new Bullet();
	bullet.x = tower.x;
	bullet.y = tower.y;
	bullet.target = target;
	bullets.push(bullet);
	game.addChild(bullet);
}
// Function to handle game over
function gameOver() {
	LK.effects.flashScreen(0xff0000, 1000);
	LK.showGameOver();
}
function updateMissedEnemiesList() {
	missedEnemiesTxt.setText('Missed Enemies: ' + missedEnemies.length);
}
// Function to spawn enemies
function spawnEnemy() {
	var enemy = new Enemy();
	enemy.x = Math.random() * 2048;
	enemy.y = -50;
	enemies.push(enemy);
	game.addChild(enemy);
}
// Game update function
game.update = function () {
	for (var i = 0; i < towers.length; i++) {
		towers[i].update();
	}
	for (var i = 0; i < enemies.length; i++) {
		enemies[i].update();
	}
	for (var i = 0; i < bullets.length; i++) {
		bullets[i].update();
	}
	if (LK.ticks % 120 == 0) {
		spawnEnemy();
	}
};
// Event listener for placing towers
game.down = function (x, y, obj) {
	var tower = new Tower();
	tower.x = x;
	tower.y = y;
	towers.push(tower);
	game.addChild(tower);
};