/****
* Classes
****/
// PowerUp class to represent power-ups in the game
var PowerUp = Container.expand(function () {
  var self = Container.call(this);
  var powerUpGraphics = self.attachAsset('powerUp', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  // Randomly position the power-up within the game area
  self.randomizePosition = function () {
    self.x = Math.random() * 2048;
    self.y = Math.random() * 2732;
  };
});
//<Assets used in the game will automatically appear here>
// Snake class to represent the snake in the game
var Snake = Container.expand(function () {
  var self = Container.call(this);
  self.segments = [];
  self.direction = {
    x: 0,
    y: -1
  }; // Initial direction: moving up
  self.speed = 5; // Speed of the snake
  // Initialize the snake with a given length
  self.init = function (length) {
    for (var i = 0; i < length; i++) {
      var segment = self.attachAsset('snakeSegment', {
        anchorX: 0.5,
        anchorY: 0.5
      });
      segment.x = 1024; // Center horizontally
      segment.y = 1366 + i * 20; // Stack segments vertically
      self.segments.push(segment);
    }
  };
  // Update the snake's position
  self.update = function () {
    // Move each segment to the position of the previous one
    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;
    }
    // Move the head in the current direction
    self.segments[0].x += self.direction.x * self.speed;
    self.segments[0].y += self.direction.y * self.speed;
  };
  // Change the direction of the snake
  self.changeDirection = function (newDirection) {
    self.direction = newDirection;
  };
  // Grow the snake by adding a new segment
  self.grow = function () {
    var lastSegment = self.segments[self.segments.length - 1];
    var newSegment = self.attachAsset('snakeSegment', {
      anchorX: 0.5,
      anchorY: 0.5
    });
    newSegment.x = lastSegment.x;
    newSegment.y = lastSegment.y;
    self.segments.push(newSegment);
  };
});

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

/****
* Game Code
****/
// Initialize game variables
var snake = new Snake();
var powerUp = new PowerUp();
var score = 0;
var scoreTxt = new Text2('Score: 0', {
  size: 100,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Initialize the snake and power-up
game.addChild(snake);
snake.init(5); // Start with 5 segments
game.addChild(powerUp);
powerUp.randomizePosition();
// Handle touch events to change snake direction
game.down = function (x, y, obj) {
  var game_position = game.toLocal(obj.global);
  if (game_position.x < snake.segments[0].x) {
    snake.changeDirection({
      x: -1,
      y: 0
    }); // Move left
  } else if (game_position.x > snake.segments[0].x) {
    snake.changeDirection({
      x: 1,
      y: 0
    }); // Move right
  } else if (game_position.y < snake.segments[0].y) {
    snake.changeDirection({
      x: 0,
      y: -1
    }); // Move up
  } else {
    snake.changeDirection({
      x: 0,
      y: 1
    }); // Move down
  }
};
// Update game logic
game.update = function () {
  snake.update();
  // Check for collision with power-up
  if (snake.segments[0].intersects(powerUp)) {
    snake.grow();
    powerUp.randomizePosition();
    score += 10;
    scoreTxt.setText('Score: ' + score);
  }
  // Check for collision with walls
  var head = snake.segments[0];
  if (head.x < 0 || head.x > 2048 || head.y < 0 || head.y > 2732) {
    LK.effects.flashScreen(0xff0000, 1000);
    LK.showGameOver();
  }
  // Check for collision with itself
  for (var i = 1; i < snake.segments.length; i++) {
    if (head.intersects(snake.segments[i])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
};