/****
* 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.move = function () {
    self.y += self.speed;
  };
});
// Meteor class
var Meteor = Container.expand(function () {
  var self = Container.call(this);
  var meteorGraphics = self.attachAsset('meteor', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 2;
  self.move = function () {
    self.y += self.speed;
  };
});
// Assets are automatically created based on usage in the code.
// Spaceship class
var Spaceship = Container.expand(function () {
  var self = Container.call(this);
  var spaceshipGraphics = self.attachAsset('spaceship', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.moveLeft = function () {
    self.x -= self.speed;
  };
  self.moveRight = function () {
    self.x += self.speed;
  };
  self.shoot = function () {
    var bullet = new Bullet();
    bullet.x = self.x;
    bullet.y = self.y - 50; // Position bullet at the top of the spaceship
    game.addChild(bullet);
    bullets.push(bullet);
  };
});

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

/****
* Game Code
****/
var spaceship;
var bullets = [];
var meteors = [];
var score = 0;
var scoreTxt;
function setup() {
  spaceship = game.addChild(new Spaceship());
  spaceship.x = 1024; // Center horizontally
  spaceship.y = 2500; // Position near the bottom
  scoreTxt = new Text2(score.toString(), {
    size: 150,
    fill: "#ffffff"
  });
  LK.gui.top.addChild(scoreTxt);
  game.on('down', function (obj) {
    var pos = obj.event.getLocalPosition(game);
    if (pos.x < 1024) {
      spaceship.moveLeft();
    } else {
      spaceship.moveRight();
    }
  });
  game.on('up', function (obj) {
    spaceship.shoot();
  });
  LK.on('tick', function () {
    bullets.forEach(function (bullet, index) {
      bullet.move();
      if (bullet.y < 0) {
        bullet.destroy();
        bullets.splice(index, 1);
      }
    });
    meteors.forEach(function (meteor, index) {
      meteor.move();
      if (meteor.y > 2732) {
        meteor.destroy();
        meteors.splice(index, 1);
      }
      bullets.forEach(function (bullet, bulletIndex) {
        if (bullet.intersects(meteor)) {
          meteor.destroy();
          bullet.destroy();
          meteors.splice(index, 1);
          bullets.splice(bulletIndex, 1);
          score += 10;
          scoreTxt.setText(score.toString());
        }
      });
    });
    if (LK.ticks % 120 == 0) {
      // Spawn a meteor every 2 seconds
      var meteor = new Meteor();
      meteor.x = Math.random() * 2048;
      meteor.y = 0;
      game.addChild(meteor);
      meteors.push(meteor);
    }
  });
}
setup();