/****
* Classes
****/
// Block class
var Block = Container.expand(function () {
  var self = Container.call(this);
  var blockGraphics = self.attachAsset('block', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = 5;
  self.move = function () {
    self.y += self.speed;
  };
});
// Character class
var Character = Container.expand(function () {
  var self = Container.call(this);
  var characterGraphics = self.attachAsset('character', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.moveLeft = function () {
    if (self.x > 50) {
      self.x -= 10;
    }
  };
  self.moveRight = function () {
    if (self.x < 1998) {
      self.x += 10;
    }
  };
});

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

/****
* Game Code
****/
// Initialize character
// Initialize assets used in this game.
var character = game.addChild(new Character());
character.x = 1024;
character.y = 2632;
// Initialize blocks array
var blocks = [];
// Initialize score
var score = 0;
var scoreTxt = new Text2(score.toString(), {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle touch events
var touchPosition = null;
game.on('down', function (obj) {
  touchPosition = obj.event.getLocalPosition(game);
});
game.on('up', function (obj) {
  touchPosition = null;
});
game.on('move', function (obj) {
  if (touchPosition) {
    touchPosition = obj.event.getLocalPosition(game);
  }
});
// Game tick event
LK.on('tick', function () {
  // Move character based on touch position
  if (touchPosition) {
    if (touchPosition.x < character.x) {
      character.moveLeft();
    } else if (touchPosition.x > character.x) {
      character.moveRight();
    }
  }
  // Move blocks
  for (var i = blocks.length - 1; i >= 0; i--) {
    blocks[i].move();
    // Check for collision with character
    if (blocks[i].intersects(character)) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
    // Remove off-screen blocks
    if (blocks[i].y > 2782) {
      blocks[i].destroy();
      blocks.splice(i, 1);
    }
  }
  // Add new blocks
  if (LK.ticks % 60 == 0) {
    var newBlock = new Block();
    newBlock.x = Math.random() * 2048;
    newBlock.y = -50;
    blocks.push(newBlock);
    game.addChild(newBlock);
  }
  // Update score
  score++;
  scoreTxt.setText(score.toString());
});