/****
* 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 = 2;
  self.update = function () {
    self.y += self.speed;
  };
});
// Player class
var Player = Container.expand(function () {
  var self = Container.call(this);
  var playerGraphics = self.attachAsset('player', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.shoot = function () {
    var bullet = new PlayerBullet();
    bullet.x = self.x;
    bullet.y = self.y - playerGraphics.height / 2;
    game.addChild(bullet);
    playerBullets.push(bullet);
  };
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Bullet class for player bullets
var PlayerBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.attachAsset('playerBullet', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -10;
  self.update = function () {
    self.y += self.speed;
  };
});

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

/****
* Game Code
****/
// Initialize player
var player = new Player();
player.x = 2048 / 2;
player.y = 2732 - 150;
game.addChild(player);
// Arrays to keep track of bullets and enemies
var playerBullets = [];
var enemies = [];
// Score display
var scoreTxt = new Text2('0', {
  size: 150,
  fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Game update function
game.update = function () {
  // Update player bullets
  for (var i = playerBullets.length - 1; i >= 0; i--) {
    playerBullets[i].update();
    if (playerBullets[i].y < -50) {
      playerBullets[i].destroy();
      playerBullets.splice(i, 1);
    }
  }
  // Update enemies
  for (var j = enemies.length - 1; j >= 0; j--) {
    enemies[j].update();
    if (enemies[j].y > 2732 + 50) {
      enemies[j].destroy();
      enemies.splice(j, 1);
    }
  }
  // Check for collisions
  for (var k = playerBullets.length - 1; k >= 0; k--) {
    for (var l = enemies.length - 1; l >= 0; l--) {
      if (playerBullets[k].intersects(enemies[l])) {
        playerBullets[k].destroy();
        enemies[l].destroy();
        playerBullets.splice(k, 1);
        enemies.splice(l, 1);
        LK.setScore(LK.getScore() + 1);
        scoreTxt.setText(LK.getScore());
        break;
      }
    }
  }
  // Spawn new enemies
  if (LK.ticks % 60 == 0) {
    var enemy = new Enemy();
    enemy.x = Math.random() * 2048;
    enemy.y = -50;
    game.addChild(enemy);
    enemies.push(enemy);
  }
};
// Player shooting
game.down = function (x, y, obj) {
  player.shoot();
};