/****
* Classes
****/
// AlienShip class
var AlienShip = Container.expand(function () {
  var self = Container.call(this);
  var alienShipGraphics = self.attachAsset('alienShip', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 3;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732) {
      self.destroy();
    }
  };
});
// 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;
    if (self.y < 0) {
      self.destroy();
    }
  };
});
// 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 = 5;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732) {
      self.destroy();
    }
  };
});
//<Assets used in the game will automatically appear here>
// 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 = 10;
  self.update = function () {
    // Spaceship update logic
  };
  self.move = function (x, y) {
    self.x = x;
    self.y = y;
  };
});

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

/****
* Game Code
****/
// Initialize variables
var spaceship;
var meteors = [];
var alienShips = [];
var bullets = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Create spaceship
spaceship = game.addChild(new Spaceship());
spaceship.x = 2048 / 2;
spaceship.y = 2732 - 200;
// Handle touch events
game.down = function (x, y, obj) {
  spaceship.move(x, y);
};
game.move = function (x, y, obj) {
  spaceship.move(x, y);
};
// Update game state
game.update = function () {
  // Update spaceship
  spaceship.update();
  // Update meteors
  for (var i = meteors.length - 1; i >= 0; i--) {
    meteors[i].update();
    if (meteors[i].intersects(spaceship)) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
  // Update alien ships
  for (var i = alienShips.length - 1; i >= 0; i--) {
    alienShips[i].update();
    if (alienShips[i].intersects(spaceship)) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
  // Update bullets
  for (var i = bullets.length - 1; i >= 0; i--) {
    bullets[i].update();
    for (var j = meteors.length - 1; j >= 0; j--) {
      if (bullets[i].intersects(meteors[j])) {
        meteors[j].destroy();
        bullets[i].destroy();
        meteors.splice(j, 1);
        bullets.splice(i, 1);
        score++;
        scoreTxt.setText(score);
        break;
      }
    }
    for (var k = alienShips.length - 1; k >= 0; k--) {
      if (bullets[i].intersects(alienShips[k])) {
        alienShips[k].destroy();
        bullets[i].destroy();
        alienShips.splice(k, 1);
        bullets.splice(i, 1);
        score++;
        scoreTxt.setText(score);
        break;
      }
    }
  }
  // Spawn meteors
  if (LK.ticks % 60 == 0) {
    var newMeteor = new Meteor();
    newMeteor.x = Math.random() * 2048;
    newMeteor.y = -50;
    meteors.push(newMeteor);
    game.addChild(newMeteor);
  }
  // Spawn alien ships
  if (LK.ticks % 120 == 0) {
    var newAlienShip = new AlienShip();
    newAlienShip.x = Math.random() * 2048;
    newAlienShip.y = -50;
    alienShips.push(newAlienShip);
    game.addChild(newAlienShip);
  }
  // Fire bullets
  if (LK.ticks % 15 == 0) {
    var newBullet = new Bullet();
    newBullet.x = spaceship.x;
    newBullet.y = spaceship.y;
    bullets.push(newBullet);
    game.addChild(newBullet);
  }
};