/****
* Classes
****/
// Paddle class for player and AI
var Paddle = Container.expand(function () {
  var self = Container.call(this);
  var paddleGraphics = self.createAsset('paddle', 'Paddle Graphics', 0.5, 0.5);
  self.speed = 10;
  self.moveUp = function () {
    if (self.y > 0) {
      self.y -= self.speed;
    }
  };
  self.moveDown = function () {
    if (self.y < game.height - paddleGraphics.height) {
      self.y += self.speed;
    }
  };
});
// Ball class
var Ball = Container.expand(function () {
  var self = Container.call(this);
  var ballGraphics = self.createAsset('ball', 'Ball Graphics', 0.5, 0.5);
  self.velocity = {
    x: 5,
    y: 5
  };
  self.move = function () {
    self.x += self.velocity.x;
    self.y += self.velocity.y;
  };
  self.reset = function () {
    self.x = game.width / 2;
    self.y = game.height / 2;
    self.velocity = {
      x: 5,
      y: 5
    };
  };
  self.bounce = function (axis) {
    if (axis === 'x') {
      self.velocity.x *= -1;
    } else if (axis === 'y') {
      self.velocity.y *= -1;
    }
  };
});

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

/****
* Game Code
****/
// Initialize paddles and ball
var playerPaddle = new Paddle();
var aiPaddle = new Paddle();
var ball = new Ball();
// Set initial positions
playerPaddle.x = 100;
playerPaddle.y = game.height / 2;
aiPaddle.x = game.width - 100;
aiPaddle.y = game.height / 2;
ball.reset();
// Add paddles and ball to the game
game.addChild(playerPaddle);
game.addChild(aiPaddle);
game.addChild(ball);
// AI logic
function aiMove() {
  if (ball.y < aiPaddle.y) {
    aiPaddle.moveUp();
  } else if (ball.y > aiPaddle.y) {
    aiPaddle.moveDown();
  }
}
// Game tick event
LK.on('tick', function () {
  // Move ball
  ball.move();
  // Ball collision with top and bottom
  if (ball.y <= 0 || ball.y >= game.height) {
    ball.bounce('y');
  }
  // Ball collision with paddles
  if (ball.intersects(playerPaddle) || ball.intersects(aiPaddle)) {
    ball.bounce('x');
  }
  // Ball out of bounds
  if (ball.x <= 0 || ball.x >= game.width) {
    ball.reset();
  }
  // AI movement
  aiMove();
  // Touch controls for player paddle
  game.on('down', function (obj) {
    var touchPos = obj.event.getLocalPosition(game);
    if (touchPos.y < game.height / 2) {
      playerPaddle.moveUp();
    } else {
      playerPaddle.moveDown();
    }
  });
});