/****
* Classes
****/
// Assets will be automatically created and loaded by the LK engine based on their usage in the code.
// Bird class to represent the player's character
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 = -10;
  self.update = function () {
    self.velocity += self.gravity;
    self.y += self.velocity;
  };
  self.flap = function () {
    self.velocity = self.flapStrength;
  };
});
// Column class to represent obstacles
var Column = Container.expand(function () {
  var self = Container.call(this);
  var columnGraphics = self.attachAsset('column', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -5;
  self.update = function () {
    self.x += self.speed;
  };
});

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

/****
* Game Code
****/
var bird;
var columns = [];
var columnSpacing = 600;
var columnWidth = 200;
var columnGap = 400;
var score = 0;
var scoreTxt;
// Initialize game elements
function initGame() {
  bird = game.addChild(new Bird());
  bird.x = 300;
  bird.y = 1366; // Center vertically
  scoreTxt = new Text2('0', {
    size: 150,
    fill: "#ffffff"
  });
  scoreTxt.anchor.set(0.5, 0);
  LK.gui.top.addChild(scoreTxt);
  // Create initial columns
  for (var i = 0; i < 3; i++) {
    createColumn(2048 + i * columnSpacing);
  }
}
// Create a new column pair
function createColumn(x) {
  var gapPosition = Math.random() * (2732 - columnGap - 200) + 100;
  var topColumn = game.addChild(new Column());
  topColumn.x = x;
  topColumn.y = gapPosition - columnGap / 2 - columnWidth / 2;
  columns.push(topColumn);
  var bottomColumn = game.addChild(new Column());
  bottomColumn.x = x;
  bottomColumn.y = gapPosition + columnGap / 2 + columnWidth / 2;
  columns.push(bottomColumn);
}
// Handle game updates
game.update = function () {
  bird.update();
  // Check for collisions and update columns
  for (var i = columns.length - 1; i >= 0; i--) {
    columns[i].update();
    // Check for collision with bird
    if (bird.intersects(columns[i])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
      return;
    }
    // Remove columns that are off-screen
    if (columns[i].x < -columnWidth) {
      columns[i].destroy();
      columns.splice(i, 1);
      // Increase score and create new column
      score++;
      scoreTxt.setText(score);
      createColumn(2048 + columnSpacing);
    }
  }
  // Check if bird is out of bounds
  if (bird.y < 0 || bird.y > 2732) {
    LK.effects.flashScreen(0xff0000, 1000);
    LK.showGameOver();
  }
};
// Handle tap to flap
game.down = function (x, y, obj) {
  bird.flap();
};
// Initialize the game
initGame();