/****
* Classes
****/
// The assets will be automatically created and loaded by the LK engine based on their usage in the code.
// For this game, we will use a bird and pole shapes, and a background image for the forest.
// Bird class to represent the player-controlled bird
var Bird = Container.expand(function () {
  var self = Container.call(this);
  var birdGraphics = self.attachAsset('bird', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.velocity = 0;
  self.gravity = 0.5;
  self.flapStrength = -8;
  // Update function to apply gravity and move the bird
  self.update = function () {
    self.velocity += self.gravity;
    self.y += self.velocity;
  };
  // Function to make the bird flap
  self.flap = function () {
    self.velocity = self.flapStrength;
  };
});
// Pole class to represent the obstacles
var Pole = Container.expand(function () {
  var self = Container.call(this);
  var poleGraphics = self.attachAsset('pole', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -5;
  // Update function to move the pole
  self.update = function () {
    self.x += self.speed;
  };
});

/****
* Initialize Game
****/
var game = new LK.Game({
  backgroundColor: 0x87CEEB // Set a sky blue background color
});

/****
* Game Code
****/
// Initialize game variables
var bird = game.addChild(new Bird());
bird.x = 2048 / 4;
bird.y = 2732 / 2;
var poles = [];
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Function to create a new pair of poles
function createPoles() {
  var gap = 400;
  var poleHeight = Math.random() * 800 + 400;
  var topPole = new Pole();
  topPole.x = 2048;
  topPole.y = poleHeight - 2732;
  poles.push(topPole);
  game.addChild(topPole);
  var bottomPole = new Pole();
  bottomPole.x = 2048;
  bottomPole.y = poleHeight + gap;
  poles.push(bottomPole);
  game.addChild(bottomPole);
}
// Handle screen tap to make the bird flap
game.down = function (x, y, obj) {
  bird.flap();
};
// Update game logic
game.update = function () {
  bird.update();
  // Check for collision with ground or ceiling
  if (bird.y > 2732 || bird.y < 0) {
    LK.showGameOver();
  }
  // Update poles and check for collisions
  for (var i = poles.length - 1; i >= 0; i--) {
    poles[i].update();
    // Check for collision with bird
    if (bird.intersects(poles[i])) {
      LK.showGameOver();
    }
    // Remove poles that have moved off screen
    if (poles[i].x < -100) {
      poles[i].destroy();
      poles.splice(i, 1);
      score++;
      scoreTxt.setText(score);
    }
  }
  // Create new poles periodically
  if (LK.ticks % 120 == 0) {
    createPoles();
  }
};