/****
* Classes
****/
// 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 = 5;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732 + enemyGraphics.height) {
      self.destroy();
      enemies.splice(enemies.indexOf(self), 1);
    }
  };
});
//<Assets used in the game will automatically appear here>
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.attachAsset('hero', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 10;
  self.update = function () {
    // Hero update logic
  };
  self.shoot = function () {
    var bullet = new HeroBullet();
    bullet.x = self.x;
    bullet.y = self.y - heroGraphics.height / 2;
    game.addChild(bullet);
    heroBullets.push(bullet);
  };
});
// HeroBullet class
var HeroBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.attachAsset('heroBullet', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -15;
  self.update = function () {
    self.y += self.speed;
    if (self.y < -bulletGraphics.height) {
      self.destroy();
      heroBullets.splice(heroBullets.indexOf(self), 1);
    }
  };
});

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

/****
* Game Code
****/
// Initialize arrays and variables
var hero;
var heroBullets = [];
var enemies = [];
var score = 0;
var scoreTxt;
// Initialize game elements
function initGame() {
  // Create hero
  hero = new Hero();
  hero.x = 2048 / 2;
  hero.y = 2732 - 200;
  game.addChild(hero);
  // Create score text
  scoreTxt = new Text2('0', {
    size: 150,
    fill: "#ffffff"
  });
  scoreTxt.anchor.set(0.5, 0);
  LK.gui.top.addChild(scoreTxt);
  // Set up game update loop
  game.update = function () {
    // Update hero
    hero.update();
    // Update hero bullets
    for (var i = heroBullets.length - 1; i >= 0; i--) {
      heroBullets[i].update();
    }
    // Update enemies
    for (var j = enemies.length - 1; j >= 0; j--) {
      enemies[j].update();
    }
    // Check for collisions
    checkCollisions();
    // Spawn enemies
    if (LK.ticks % 60 == 0) {
      spawnEnemy();
    }
  };
  // Set up game controls
  game.down = function (x, y, obj) {
    hero.shoot();
  };
}
// Check for collisions between hero bullets and enemies
function checkCollisions() {
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    for (var j = enemies.length - 1; j >= 0; j--) {
      if (heroBullets[i].intersects(enemies[j])) {
        // Destroy enemy and bullet
        enemies[j].destroy();
        heroBullets[i].destroy();
        enemies.splice(j, 1);
        heroBullets.splice(i, 1);
        // Update score
        score += 10;
        scoreTxt.setText(score);
        break;
      }
    }
  }
}
// Spawn a new enemy
function spawnEnemy() {
  var enemy = new Enemy();
  enemy.x = Math.random() * 2048;
  enemy.y = -enemy.height;
  game.addChild(enemy);
  enemies.push(enemy);
}
// Initialize the game
initGame();