/****
* Classes
****/
// Define the Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.createAsset('soccerPlayer', 'Hero character', 0.5, 0.5);
  self.speed = 5;
  self.shootInterval = 30;
  self.shootTick = 0;
  self.moveLeft = function () {
    self.x = Math.max(self.width / 2, self.x - self.speed);
  };
  self.moveRight = function () {
    self.x = Math.min(2048 - self.width / 2, self.x + self.speed);
  };
  self.shoot = function () {
    if (self.shootTick <= 0) {
      var bullet = new HeroBullet();
      bullet.x = self.x;
      bullet.y = self.y - self.height / 2;
      game.addChild(bullet);
      heroBullets.push(bullet);
      self.shootTick = self.shootInterval;
    }
  };
  self.update = function () {
    if (self.shootTick > 0) {
      self.shootTick--;
    }
  };
});
// Define the HeroBullet class
var HeroBullet = Container.expand(function () {
  var self = Container.call(this);
  var bulletGraphics = self.createAsset('heroBullet', 'Hero Bullet', 0.5, 1);
  self.speed = -10;
  self.move = function () {
    self.y += self.speed;
  };
});
// Define the Zombie class
var Zombie = Container.expand(function () {
  var self = Container.call(this);
  var zombieGraphics = self.createAsset('zombie', 'Zombie enemy', 0.5, 0.5);
  self.speed = 2;
  self.move = function () {
    self.y += self.speed;
  };
});

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

/****
* Game Code
****/
var hero = game.addChild(new Hero());
hero.x = 2048 / 2;
hero.y = 2732 - 100;
var heroBullets = [];
var zombies = [];
// Handle touch events for hero movement and shooting
game.on('down', function (obj) {
  var touchPos = obj.event.getLocalPosition(game);
  if (touchPos.x < 2048 / 2) {
    hero.moveLeft();
  } else {
    hero.moveRight();
  }
  hero.shoot();
});
// Main game loop
LK.on('tick', function () {
  // Update hero
  hero.update();
  // Move hero bullets
  for (var i = heroBullets.length - 1; i >= 0; i--) {
    heroBullets[i].move();
    if (heroBullets[i].y < -50) {
      heroBullets[i].destroy();
      heroBullets.splice(i, 1);
    }
  }
  // Spawn zombies
  if (LK.ticks % 120 == 0) {
    var zombie = new Zombie();
    zombie.x = Math.random() * (2048 - zombie.width) + zombie.width / 2;
    zombie.y = -zombie.height / 2;
    zombies.push(zombie);
    game.addChild(zombie);
  }
  // Move zombies
  for (var j = zombies.length - 1; j >= 0; j--) {
    zombies[j].move();
    if (zombies[j].y > 2732 + 50) {
      zombies[j].destroy();
      zombies.splice(j, 1);
    }
  }
  // Check for bullet-zombie collisions
  for (var k = heroBullets.length - 1; k >= 0; k--) {
    for (var l = zombies.length - 1; l >= 0; l--) {
      if (heroBullets[k].intersects(zombies[l])) {
        heroBullets[k].destroy();
        heroBullets.splice(k, 1);
        zombies[l].destroy();
        zombies.splice(l, 1);
        break;
      }
    }
  }
});