/****
* Classes
****/
//<Assets used in the game will automatically appear here>
// 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;
  };
});
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.attachAsset('hero', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.shoot = function () {
    var newBullet = new Bullet();
    newBullet.x = self.x;
    newBullet.y = self.y;
    bullets.push(newBullet);
    game.addChild(newBullet);
  };
});
// Monster class
var Monster = Container.expand(function () {
  var self = Container.call(this);
  var monsterGraphics = self.attachAsset('monster', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 2;
  self.update = function () {
    var dx = hero.x - self.x;
    var dy = hero.y - self.y;
    var dist = Math.sqrt(dx * dx + dy * dy);
    self.x += dx / dist * self.speed;
    self.y += dy / dist * self.speed;
  };
});

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

/****
* Game Code
****/
// Initialize variables
var hero = new Hero();
hero.x = 2048 / 2;
hero.y = 2732 - 200;
game.addChild(hero);
var bullets = [];
var monsters = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Spawn monsters at intervals
var spawnMonster = LK.setInterval(function () {
  var newMonster = new Monster();
  newMonster.x = Math.random() * 2048;
  newMonster.y = 0;
  monsters.push(newMonster);
  game.addChild(newMonster);
}, 2000);
// Handle game updates
game.update = function () {
  for (var i = bullets.length - 1; i >= 0; i--) {
    bullets[i].update();
    if (bullets[i].y < -50) {
      bullets[i].destroy();
      bullets.splice(i, 1);
    }
  }
  for (var j = monsters.length - 1; j >= 0; j--) {
    monsters[j].update();
    if (monsters[j].intersects(hero)) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
    for (var k = bullets.length - 1; k >= 0; k--) {
      if (monsters[j].intersects(bullets[k])) {
        monsters[j].destroy();
        bullets[k].destroy();
        monsters.splice(j, 1);
        bullets.splice(k, 1);
        score++;
        scoreTxt.setText(score);
        break;
      }
    }
  }
};
// Handle touch events
game.down = function (x, y, obj) {
  hero.shoot();
};
game.move = function (x, y, obj) {
  hero.x = x;
  hero.y = y;
};
game.up = function (x, y, obj) {
  // No action needed on touch up
};