/****
* 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.update = function () {
    self.y += self.speed;
  };
});
// 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.update = function () {
    // Enemy movement logic goes here
  };
});
// The assets will be automatically created and loaded by the LK engine
// Player class
var Player = Container.expand(function () {
  var self = Container.call(this);
  var playerGraphics = self.attachAsset('player', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.update = function () {
    // Player movement logic goes here
  };
});

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

/****
* Game Code
****/
// Initialize player, bullets and enemies
var player = game.addChild(new Player());
player.x = 2048 / 2;
player.y = 2732 - 100;
var bullets = [];
var enemies = [];
// Game update function
game.update = function () {
  // Player movement logic
  if (LK.keys['ArrowLeft']) {
    player.x -= player.speed;
  }
  if (LK.keys['ArrowRight']) {
    player.x += player.speed;
  }
  // Shooting logic
  if (LK.keys['Space']) {
    var bullet = new Bullet();
    bullet.x = player.x;
    bullet.y = player.y;
    bullets.push(bullet);
    game.addChild(bullet);
  }
  // Enemy spawning logic
  if (LK.ticks % 120 == 0) {
    var enemy = new Enemy();
    enemy.x = Math.random() * 2048;
    enemy.y = 0;
    enemies.push(enemy);
    game.addChild(enemy);
  }
  // Bullet and enemy update logic
  for (var i = bullets.length - 1; i >= 0; i--) {
    bullets[i].update();
    if (bullets[i].y < 0) {
      game.removeChild(bullets[i]);
      bullets.splice(i, 1);
    }
  }
  for (var i = enemies.length - 1; i >= 0; i--) {
    enemies[i].update();
    if (enemies[i].y > 2732) {
      game.removeChild(enemies[i]);
      enemies.splice(i, 1);
    }
  }
  // Collision detection
  for (var i = bullets.length - 1; i >= 0; i--) {
    for (var j = enemies.length - 1; j >= 0; j--) {
      if (bullets[i].intersects(enemies[j])) {
        game.removeChild(bullets[i]);
        bullets.splice(i, 1);
        game.removeChild(enemies[j]);
        enemies.splice(j, 1);
        break;
      }
    }
  }
};