/****
* Classes
****/
// Enemy class
var Enemy = Container.expand(function () {
  var self = Container.call(this);
  var enemyGraphics = self.createAsset('enemy', 'Enemy Ship', 0.5, 0.5);
  self.speed = 2;
  self.move = function () {
    self.y += self.speed;
  };
  self.isOffScreen = function () {
    return self.y > 2732 + self.height;
  };
});
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.createAsset('hero', 'Hero Ship', 0.5, 0.5);
  self.x = 2048 / 2;
  self.y = 2732 - 200;
});
// Bullet class
var Bullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.createAsset('bullet', 'Bullet', 0.5, 0.5);
  self.speed = -10;
  self.move = function () {
    self.y += self.speed;
  };
  self.isOffScreen = function () {
    return self.y < -self.height;
  };
});

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

/****
* Game Code
****/
// Initialize hero
var hero = game.addChild(new Hero());
// Initialize enemy and bullet arrays
var enemies = [];
var heroBullets = [];
// Game state
var isGameOver = false;
// Touch event handling
var dragNode = null;
function handleMove(obj) {
  var event = obj.event;
  var pos = event.getLocalPosition(game);
  if (dragNode) {
    dragNode.x = pos.x;
    dragNode.y = pos.y;
  }
}
game.on('down', function (obj) {
  dragNode = hero;
  handleMove(obj);
});
game.on('move', handleMove);
game.on('up', function (obj) {
  dragNode = null;
});
// Game tick event
LK.on('tick', function () {
  if (isGameOver) {
    LK.effects.flashScreen(0xff0000, 1000);
    LK.showGameOver();
    return;
  }
  // Move hero bullets
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    heroBullets[i].move();
    if (heroBullets[i].isOffScreen()) {
      heroBullets[i].destroy();
      heroBullets.splice(i, 1);
    }
  }
  // Move enemies
  for (var j = enemies.length - 1; j >= 0; j--) {
    enemies[j].move();
    if (enemies[j].isOffScreen()) {
      enemies[j].destroy();
      enemies.splice(j, 1);
    }
  }
  // Check for collisions
  for (var k = heroBullets.length - 1; k >= 0; k--) {
    for (var l = enemies.length - 1; l >= 0; l--) {
      if (heroBullets[k].intersects(enemies[l])) {
        heroBullets[k].destroy();
        heroBullets.splice(k, 1);
        enemies[l].destroy();
        enemies.splice(l, 1);
        break;
      }
    }
  }
  // Fire bullets
  if (LK.ticks % 15 == 0) {
    var bullet = new Bullet();
    bullet.x = hero.x;
    bullet.y = hero.y;
    heroBullets.push(bullet);
    game.addChild(bullet);
  }
  // Spawn enemies
  if (LK.ticks % 120 == 0) {
    var enemy = new Enemy();
    enemy.x = Math.random() * (2048 - enemy.width) + enemy.width / 2;
    enemy.y = -enemy.height;
    enemies.push(enemy);
    game.addChild(enemy);
  }
});