/****
* Classes
****/
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Bird class to represent the player character
var Bird = Container.expand(function () {
  var self = Container.call(this);
  var birdGraphics = self.attachAsset('bird', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.velocityY = 0;
  self.gravity = 0.5;
  self.flapStrength = -10;
  self.update = function () {
    self.velocityY += self.gravity;
    self.y += self.velocityY;
    // Prevent bird from going off-screen
    if (self.y > 2732 - birdGraphics.height / 2) {
      self.y = 2732 - birdGraphics.height / 2;
      self.velocityY = 0;
    }
    if (self.y < birdGraphics.height / 2) {
      self.y = birdGraphics.height / 2;
      self.velocityY = 0;
    }
  };
  self.flap = function () {
    self.velocityY = self.flapStrength;
  };
});
// Obstacle class to represent the pipes
var Obstacle = Container.expand(function () {
  var self = Container.call(this);
  var topPipe = self.attachAsset('pipe', {
    anchorX: 0.5,
    anchorY: 1
  });
  var bottomPipe = self.attachAsset('pipe', {
    anchorX: 0.5,
    anchorY: 0
  });
  self.speed = -5;
  self.gap = 400;
  self.update = function () {
    self.x += self.speed;
    // Reset position if off-screen
    if (self.x < -topPipe.width) {
      self.x = 2048 + topPipe.width;
      self.setRandomGap();
    }
  };
  self.setRandomGap = function () {
    var centerY = Math.random() * (2732 - self.gap) + self.gap / 2;
    topPipe.y = centerY - self.gap / 2;
    bottomPipe.y = centerY + self.gap / 2;
  };
  self.setRandomGap();
});

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

/****
* Game Code
****/
// Initialize bird
var bird = game.addChild(new Bird());
bird.x = 2048 / 4;
bird.y = 2732 / 2;
// Initialize obstacles
var obstacles = [];
for (var i = 0; i < 3; i++) {
  var obstacle = game.addChild(new Obstacle());
  obstacle.x = 2048 + i * 800;
  obstacles.push(obstacle);
}
// Handle game tap to make the bird flap
game.down = function (x, y, obj) {
  bird.flap();
};
// Update game logic
game.update = function () {
  bird.update();
  for (var i = 0; i < obstacles.length; i++) {
    obstacles[i].update();
    // Check for collision
    if (bird.intersects(obstacles[i])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
    }
  }
};