/**** 
* Classes
****/ 
// Enemy class for targets
var Enemy = Container.expand(function () {
	var self = Container.call(this);
	var enemyGraphics = self.attachAsset('enemy', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = 4;
	self.move = function () {
		self.x += self.speed;
		self.rotation += 0.25; // Add rotation to the enemy
	};
});
// Assets are automatically created based on usage in the code.
// Bullet class for bullets fired by the player
var PlayerBullet = Container.expand(function () {
	var self = Container.call(this);
	var bulletGraphics = self.attachAsset('playerBullet', {
		anchorX: 0.5,
		anchorY: 0.5
	});
	self.speed = -20;
	self.move = function () {
		self.x += self.speed * Math.cos(this.direction);
		self.y += self.speed * Math.sin(this.direction);
	};
	self.distanceTo = function (other) {
		var dx = other.x - this.x;
		var dy = other.y - this.y;
		return Math.sqrt(dx * dx + dy * dy);
	};
});

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

/**** 
* Game Code
****/ 
// Create a background
var background = game.addChild(new Container());
var backgroundGraphics = background.attachAsset('background', {
	anchorX: 0.5,
	anchorY: 0.5
});
background.x = 1024; // Center horizontally
background.y = 1366; // Center vertically
var playerBullets = [];
var enemies = [];
var spawnEnemyInterval = 120; // Frames until next enemy spawns
var enemySpawnTimer = 0;
// Function to spawn enemies
function spawnEnemy() {
	var enemy = new Enemy();
	enemy.x = -100; // Start at the left
	enemy.y = Math.random() * (1366 - 100) + 100; // Random position from 100 to 1366
	enemies.push(enemy);
	game.addChild(enemy);
}
// Function to fire a bullet
function fireBullet() {
	var bullet = new PlayerBullet();
	bullet.x = 1024; // Center horizontally
	bullet.y = 2632; // Bottom of the screen
	playerBullets.push(bullet);
	game.addChild(bullet);
	return bullet;
}
// Touch event to fire bullets
var lastBulletTime = 0;
game.on('down', function (obj) {
	if (LK.ticks - lastBulletTime >= 60 || playerBullets.length === 0) {
		// 60 ticks = 1 second at 60FPS
		var bullet = fireBullet();
		var touchPos = obj.event.getLocalPosition(game);
		var angle = Math.atan2(2632 - touchPos.y, 1024 - touchPos.x);
		bullet.direction = angle; // Set direction to shoot towards the touch point
		lastBulletTime = LK.ticks;
	}
});
// Main game loop
LK.on('tick', function () {
	// Move bullets
	for (var i = playerBullets.length - 1; i >= 0; i--) {
		playerBullets[i].move();
		if (playerBullets[i].y < 0) {
			// Remove bullets that go off screen
			playerBullets[i].destroy();
			playerBullets.splice(i, 1);
		}
	}
	// Move enemies
	for (var j = enemies.length - 1; j >= 0; j--) {
		enemies[j].move();
		if (enemies[j].y > 2732) {
			// Remove enemies that go off screen
			enemies[j].destroy();
			enemies.splice(j, 1);
		}
	}
	// Check for collisions
	for (var b = playerBullets.length - 1; b >= 0; b--) {
		for (var e = enemies.length - 1; e >= 0; e--) {
			if (playerBullets[b] && enemies[e] && playerBullets[b].intersects(enemies[e]) && playerBullets[b].distanceTo(enemies[e]) <= 100) {
				// Destroy both bullet and enemy on collision
				playerBullets[b].destroy();
				playerBullets.splice(b, 1);
				enemies[e].destroy();
				enemies.splice(e, 1);
				break; // Exit loop after collision to avoid errors
			}
		}
	}
	// Spawn enemies
	if (enemySpawnTimer <= 0) {
		spawnEnemy();
		enemySpawnTimer = spawnEnemyInterval;
	} else {
		enemySpawnTimer--;
	}
});