/****
* Classes
****/
// Define the Player class
var Player = Container.expand(function () {
  var self = Container.call(this);
  var playerGraphics = self.createAsset('playerCar', 'Player car', 0.5, 0.5);
  self.speed = 5;
  self.moveLeft = function () {
    self.x = Math.max(self.width / 2, self.x - self.speed);
  };
  self.moveRight = function () {
    self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
  };
});
// Define the Enemy class
var Enemy = Container.expand(function () {
  var self = Container.call(this);
  var enemyGraphics = self.createAsset('enemyCar', 'Enemy car', 0.5, 0.5);
  self.speed = 3;
  self.update = function () {
    self.y += self.speed;
  };
});
// Define the Bullet class
var Bullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.createAsset('bullet', 'Bullet', 0.5, 1);
  self.speed = -10;
  self.move = function () {
    self.y += self.speed;
  };
});

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

/****
* Game Code
****/
// Initialize important asset arrays
var enemies = [];
var bullets = [];
var player;
// Initialize the player
player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - player.height;
// Handle touch events for player movement
function handleTouch(obj) {
  var touchPos = obj.event.getLocalPosition(game);
  if (touchPos.x < 2048 / 2) {
    player.moveLeft();
  } else {
    player.moveRight();
  }
}
game.on('down', handleTouch);
// Game tick event
LK.on('tick', function () {
  // Update player
  player.update();
  // Update enemies
  for (var i = enemies.length - 1; i >= 0; i--) {
    enemies[i].update();
    if (enemies[i].y > 2732) {
      enemies[i].destroy();
      enemies.splice(i, 1);
    }
  }
  // Update bullets
  for (var j = bullets.length - 1; j >= 0; j--) {
    bullets[j].move();
    if (bullets[j].y < 0) {
      bullets[j].destroy();
      bullets.splice(j, 1);
    }
  }
  // Check for collisions between bullets and enemies
  for (var k = bullets.length - 1; k >= 0; k--) {
    for (var l = enemies.length - 1; l >= 0; l--) {
      if (bullets[k].intersects(enemies[l])) {
        bullets[k].destroy();
        bullets.splice(k, 1);
        enemies[l].destroy();
        enemies.splice(l, 1);
        break;
      }
    }
  }
  // Spawn enemies
  if (LK.ticks % 120 == 0) {
    var newEnemy = new Enemy();
    newEnemy.x = Math.random() * (2048 - newEnemy.width) + newEnemy.width / 2;
    newEnemy.y = -newEnemy.height;
    enemies.push(newEnemy);
    game.addChild(newEnemy);
  }
  // Fire bullets
  if (LK.ticks % 30 == 0) {
    var newBullet = new Bullet();
    newBullet.x = player.x;
    newBullet.y = player.y - player.height / 2;
    bullets.push(newBullet);
    game.addChild(newBullet);
  }
});