/****
* Classes
****/
// Food class
var Food = Container.expand(function () {
  var self = Container.call(this);
  var foodGraphic = self.attachAsset('food', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.respawn = function () {
    self.x = Math.random() * 2048;
    self.y = Math.random() * 2732;
  };
  self.respawn();
});
//<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 = 5;
  self.grow = false;
  self.init = function () {
    for (var i = 0; i < 5; i++) {
      var segment = self.attachAsset('snakeSegment', {
        anchorX: 0.5,
        anchorY: 0.5
      });
      segment.x = 1024 - i * 20;
      segment.y = 1366;
      self.segments.push(segment);
    }
  };
  self.update = function () {
    var head = self.segments[0];
    var newX = head.x + self.direction.x * self.speed;
    var newY = head.y + self.direction.y * self.speed;
    if (self.grow) {
      var newSegment = self.attachAsset('snakeSegment', {
        anchorX: 0.5,
        anchorY: 0.5
      });
      self.segments.push(newSegment);
      self.grow = false;
    }
    for (var i = self.segments.length - 1; i > 0; i--) {
      self.segments[i].x = self.segments[i - 1].x;
      self.segments[i].y = self.segments[i - 1].y;
    }
    head.x = newX;
    head.y = newY;
  };
  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].intersects(food)) {
    food.respawn();
    snake.grow = true;
    score += 1;
    scoreTxt.setText(score);
  }
  // Check for collision with self or boundaries
  var head = snake.segments[0];
  if (head.x < 0 || head.x > 2048 || head.y < 0 || head.y > 2732) {
    LK.showGameOver();
  }
  for (var i = 1; i < snake.segments.length; i++) {
    if (head.intersects(snake.segments[i])) {
      LK.showGameOver();
    }
  }
};
game.down = function (x, y, obj) {
  var game_position = game.toLocal(obj.global);
  var head = snake.segments[0];
  if (Math.abs(game_position.x - head.x) > Math.abs(game_position.y - head.y)) {
    if (game_position.x > head.x) {
      snake.changeDirection({
        x: 1,
        y: 0
      });
    } else {
      snake.changeDirection({
        x: -1,
        y: 0
      });
    }
  } else {
    if (game_position.y > head.y) {
      snake.changeDirection({
        x: 0,
        y: 1
      });
    } else {
      snake.changeDirection({
        x: 0,
        y: -1
      });
    }
  }
};