/****
* Classes
****/
// Food class
var Food = Container.expand(function () {
  var self = Container.call(this);
  var food = self.attachAsset('food', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.randomizePosition = function () {
    self.x = Math.floor(Math.random() * 2048);
    self.y = Math.floor(Math.random() * 2732);
  };
  self.randomizePosition();
});
//<Assets used in the game will automatically appear here>
// Snake class
var Snake = Container.expand(function () {
  var self = Container.call(this);
  self.segments = [];
  self.direction = {
    x: 1,
    y: 0
  };
  self.speed = 10;
  self.grow = false;
  self.init = function () {
    for (var i = 0; i < 5; i++) {
      var segment = self.addSegment(1024 - i * 20, 1366);
      self.segments.push(segment);
    }
  };
  self.addSegment = function (x, y) {
    var segment = self.attachAsset('snakeSegment', {
      anchorX: 0.5,
      anchorY: 0.5,
      x: x,
      y: y
    });
    return segment;
  };
  self.update = function () {
    var newHeadX = self.segments[0].x + self.direction.x * self.speed;
    var newHeadY = self.segments[0].y + self.direction.y * self.speed;
    if (self.grow) {
      var newSegment = self.addSegment(newHeadX, newHeadY);
      self.segments.unshift(newSegment);
      self.grow = false;
    } else {
      var tail = self.segments.pop();
      tail.x = newHeadX;
      tail.y = newHeadY;
      self.segments.unshift(tail);
    }
    // Check for collisions with walls
    if (newHeadX < 0 || newHeadX > 2048 || newHeadY < 0 || newHeadY > 2732) {
      LK.showGameOver();
    }
    // Check for collisions with itself
    for (var i = 1; i < self.segments.length; i++) {
      if (self.segments[0].x === self.segments[i].x && self.segments[0].y === self.segments[i].y) {
        LK.showGameOver();
      }
    }
  };
  self.changeDirection = function (newDirection) {
    if ((newDirection.x !== -self.direction.x || newDirection.y !== -self.direction.y) && (newDirection.x !== self.direction.x || newDirection.y !== self.direction.y)) {
      self.direction = newDirection;
    }
  };
  self.init();
});

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

/****
* Game Code
****/
var snake = game.addChild(new Snake());
var food = game.addChild(new Food());
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
game.update = function () {
  snake.update();
  // Check for collision with food
  if (snake.segments[0].x === food.x && snake.segments[0].y === food.y) {
    snake.grow = true;
    food.randomizePosition();
    score += 1;
    scoreTxt.setText(score);
  }
};
game.down = function (x, y, obj) {
  var head = snake.segments[0];
  var direction = {
    x: 0,
    y: 0
  };
  if (Math.abs(x - head.x) > Math.abs(y - head.y)) {
    direction.x = x > head.x ? 1 : -1;
  } else {
    direction.y = y > head.y ? 1 : -1;
  }
  snake.changeDirection(direction);
};