/****
* 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.update = function () {
    self.y += self.speed;
    if (self.y < -50) {
      self.destroy();
    }
  };
});
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Tower class
var Tower = Container.expand(function () {
  var self = Container.call(this);
  var towerGraphics = self.attachAsset('tower', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.health = 100;
  self.upgradeLevel = 1;
  self.upgrade = function () {
    if (self.upgradeLevel < 5) {
      self.upgradeLevel++;
      // Increase tower capabilities
    }
  };
  self.takeDamage = function (damage) {
    self.health -= damage;
    if (self.health <= 0) {
      LK.showGameOver();
    }
  };
});
// Zombie class
var Zombie = Container.expand(function () {
  var self = Container.call(this);
  var zombieGraphics = self.attachAsset('zombie', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 2;
  self.health = 20;
  self.update = function () {
    self.y += self.speed;
    if (self.y > 2732) {
      tower.takeDamage(10);
      self.destroy();
    }
  };
  self.takeDamage = function (damage) {
    self.health -= damage;
    if (self.health <= 0) {
      self.destroy();
    }
  };
});

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

/****
* Game Code
****/
var tower = game.addChild(new Tower());
tower.x = 2048 / 2;
tower.y = 2732 - 200;
var bullets = [];
var zombies = [];
var lastZombieSpawn = 0;
game.update = function () {
  // Update bullets
  for (var i = bullets.length - 1; i >= 0; i--) {
    var bullet = bullets[i];
    bullet.update();
    for (var j = zombies.length - 1; j >= 0; j--) {
      var zombie = zombies[j];
      if (bullet.intersects(zombie)) {
        zombie.takeDamage(10);
        bullet.destroy();
        bullets.splice(i, 1);
        break;
      }
    }
  }
  // Update zombies
  for (var i = zombies.length - 1; i >= 0; i--) {
    var zombie = zombies[i];
    zombie.update();
  }
  // Spawn new zombies
  if (LK.ticks - lastZombieSpawn > 60) {
    var newZombie = new Zombie();
    newZombie.x = Math.random() * 2048;
    newZombie.y = -50;
    zombies.push(newZombie);
    game.addChild(newZombie);
    lastZombieSpawn = LK.ticks;
  }
};
game.down = function (x, y, obj) {
  var newBullet = new Bullet();
  newBullet.x = tower.x;
  newBullet.y = tower.y;
  bullets.push(newBullet);
  game.addChild(newBullet);
};