/****
* Classes
****/
// Asteroid class
var Asteroid = Container.expand(function () {
  var self = Container.call(this);
  var asteroidGraphics = self.attachAsset('asteroid', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 3;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732 + asteroidGraphics.height) {
      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 = 5;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732 + enemyGraphics.height) {
      self.destroy();
    }
  };
});
//<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 () {
    // Update logic for hero
  };
  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();
    }
  };
});

/****
* 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 asteroids = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Initialize hero
hero = new Hero();
hero.x = 2048 / 2;
hero.y = 2732 - 200;
game.addChild(hero);
// Handle game events
game.down = function (x, y, obj) {
  hero.x = x;
  hero.y = y;
};
game.move = function (x, y, obj) {
  hero.x = x;
  hero.y = y;
};
game.up = function (x, y, obj) {
  // No action needed on up event
};
// Update game state
game.update = function () {
  // Update hero bullets
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    heroBullets[i].update();
    if (heroBullets[i].y < -heroBullets[i].height) {
      heroBullets[i].destroy();
      heroBullets.splice(i, 1);
    }
  }
  // Update enemies
  for (var i = enemies.length - 1; i >= 0; i--) {
    enemies[i].update();
    if (enemies[i].y > 2732 + enemies[i].height) {
      enemies[i].destroy();
      enemies.splice(i, 1);
    }
  }
  // Update asteroids
  for (var i = asteroids.length - 1; i >= 0; i--) {
    asteroids[i].update();
    if (asteroids[i].y > 2732 + asteroids[i].height) {
      asteroids[i].destroy();
      asteroids.splice(i, 1);
    }
  }
  // Check for collisions
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    for (var j = enemies.length - 1; j >= 0; j--) {
      if (heroBullets[i].intersects(enemies[j])) {
        heroBullets[i].destroy();
        enemies[j].destroy();
        heroBullets.splice(i, 1);
        enemies.splice(j, 1);
        score += 10;
        scoreTxt.setText(score);
        break;
      }
    }
  }
  // Spawn enemies
  if (LK.ticks % 60 == 0) {
    var enemy = new Enemy();
    enemy.x = Math.random() * 2048;
    enemy.y = -enemy.height;
    game.addChild(enemy);
    enemies.push(enemy);
  }
  // Spawn asteroids
  if (LK.ticks % 120 == 0) {
    var asteroid = new Asteroid();
    asteroid.x = Math.random() * 2048;
    asteroid.y = -asteroid.height;
    game.addChild(asteroid);
    asteroids.push(asteroid);
  }
};
// Shoot bullets
game.down = function (x, y, obj) {
  hero.shoot();
};
game.move = function (x, y, obj) {
  hero.x = x;
  hero.y = y;
};
game.up = function (x, y, obj) {
  // No action needed on up event
};