/****
* Classes
****/
// Gold class
var Gold = Container.expand(function () {
  var self = Container.call(this);
  var goldGraphics = self.attachAsset('gold', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.update = function () {
    self.y += 2;
  };
});
// Obstacle class
var Obstacle = Container.expand(function () {
  var self = Container.call(this);
  var obstacleGraphics = self.attachAsset('obstacle', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.update = function () {
    self.y += 3;
  };
});
//<Assets used in the game will automatically appear here>
// Train class
var Train = Container.expand(function () {
  var self = Container.call(this);
  var trainGraphics = self.attachAsset('train', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.update = function () {
    self.y -= self.speed;
  };
});

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

/****
* Game Code
****/
// Initialize arrays and variables
var train;
var golds = [];
var obstacles = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Initialize train
train = game.addChild(new Train());
train.x = 2048 / 2;
train.y = 2732 - 200;
// Function to handle game over
function gameOver() {
  LK.effects.flashScreen(0xff0000, 1000);
  LK.showGameOver();
}
// Function to handle move events
function handleMove(x, y, obj) {
  train.x = x;
  train.y = y;
}
// Mouse or touch move on game object
game.move = handleMove;
// Mouse or touch down on game object
game.down = function (x, y, obj) {
  handleMove(x, y, obj);
};
// Mouse or touch up on game object
game.up = function (x, y, obj) {
  // No action needed on up event
};
// Game update function
game.update = function () {
  // Update train position
  train.update();
  // Update golds and check for collisions
  for (var i = golds.length - 1; i >= 0; i--) {
    golds[i].update();
    if (train.intersects(golds[i])) {
      score += 10;
      scoreTxt.setText(score);
      golds[i].destroy();
      golds.splice(i, 1);
    } else if (golds[i].y > 2732) {
      golds[i].destroy();
      golds.splice(i, 1);
    }
  }
  // Update obstacles and check for collisions
  for (var j = obstacles.length - 1; j >= 0; j--) {
    obstacles[j].update();
    if (train.intersects(obstacles[j])) {
      gameOver();
      return;
    } else if (obstacles[j].y > 2732) {
      obstacles[j].destroy();
      obstacles.splice(j, 1);
    }
  }
  // Spawn golds and obstacles
  if (LK.ticks % 60 == 0) {
    var newGold = new Gold();
    newGold.x = Math.random() * 2048;
    newGold.y = -50;
    golds.push(newGold);
    game.addChild(newGold);
  }
  if (LK.ticks % 90 == 0) {
    var newObstacle = new Obstacle();
    newObstacle.x = Math.random() * 2048;
    newObstacle.y = -50;
    obstacles.push(newObstacle);
    game.addChild(newObstacle);
  }
};