/****
* Classes
****/
// Grizzly Bear class
var GrizzlyBear = Container.expand(function () {
  var self = Container.call(this);
  var bearGraphics = self.createAsset('grizzlyBear', 'Grizzly Bear running', 0.5, 1);
  self.speed = 5;
  self.move = function () {
    self.x += self.speed;
    if (self.x > 2048) {
      self.x = -bearGraphics.width;
    }
  };
});
// Lemming class
var Lemming = Container.expand(function () {
  var self = Container.call(this);
  var lemmingGraphics = self.createAsset('lemming', 'Lemming running away', 0.5, 1);
  self.speed = 3;
  self.move = function () {
    self.x += self.speed;
    if (self.x > 2048) {
      self.destroy();
    }
  };
});

/****
* Initialize Game
****/
var game = new LK.Game({
  backgroundColor: 0x87CEEB // Sky blue background
});

/****
* Game Code
****/
// Initialize important asset arrays
var lemmings = [];
var grizzlyBear;
// Create the Grizzly Bear
grizzlyBear = game.addChild(new GrizzlyBear());
grizzlyBear.x = 100;
grizzlyBear.y = 2732 - grizzlyBear.height;
// Game tick event
LK.on('tick', function () {
  // Move the Grizzly Bear
  grizzlyBear.move();
  // Move each Lemming
  for (var i = lemmings.length - 1; i >= 0; i--) {
    lemmings[i].move();
    // Check if Lemming is off screen and destroy it
    if (lemmings[i].x > 2048) {
      lemmings[i].destroy();
      lemmings.splice(i, 1);
    }
  }
  // Spawn Lemmings at intervals
  if (LK.ticks % 120 === 0) {
    var newLemming = new Lemming();
    newLemming.x = -newLemming.width;
    newLemming.y = 2732 - newLemming.height;
    lemmings.push(newLemming);
    game.addChild(newLemming);
  }
});