/****
* Classes
****/
// Firework particle class
var FireworkParticle = Container.expand(function () {
  var self = Container.call(this);
  var particleGraphics = self.createAsset('fireworkParticle', 'Firework particle', 0.5, 0.5);
  self.speedX = 0;
  self.speedY = 0;
  self.alpha = 1;
  self.scaleX = 1;
  self.scaleY = 1;
  self.update = function () {
    self.x += self.speedX;
    self.y += self.speedY;
    self.alpha *= 0.95; // fade out
    self.scaleX *= 0.99;
    self.scaleY *= 0.99;
    if (self.alpha < 0.05) {
      self.destroy();
    }
  };
});
// Firework class
var Firework = Container.expand(function () {
  var self = Container.call(this);
  self.particles = [];
  self.explode = function (x, y) {
    for (var i = 0; i < 50; i++) {
      var particle = new FireworkParticle();
      var angle = Math.random() * Math.PI * 2;
      var speed = Math.random() * 5 + 2;
      particle.speedX = Math.cos(angle) * speed;
      particle.speedY = Math.sin(angle) * speed;
      particle.x = x;
      particle.y = y;
      self.particles.push(particle);
      game.addChild(particle);
    }
  };
  self.update = function () {
    for (var i = self.particles.length - 1; i >= 0; i--) {
      self.particles[i].update();
      if (self.particles[i].alpha < 0.05) {
        self.particles.splice(i, 1);
      }
    }
  };
});

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

/****
* Game Code
****/
// Initialize fireworks array
var fireworks = [];
// Event listener for mouse or touch down
game.on('down', function (obj) {
  var event = obj.event;
  var pos = event.getLocalPosition(game);
  var firework = new Firework();
  firework.explode(pos.x, pos.y);
  fireworks.push(firework);
});
// Update function for the game
LK.on('tick', function () {
  for (var i = fireworks.length - 1; i >= 0; i--) {
    fireworks[i].update();
    if (fireworks[i].particles.length === 0) {
      fireworks.splice(i, 1);
    }
  }
});