/****
* Classes
****/
//<Assets used in the game will automatically appear here>
//<Write imports for supported plugins here>
// Bird class to handle the bird's behavior
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.lift = -10;
  self.update = function () {
    self.velocity += self.gravity;
    self.y += self.velocity;
    // Prevent bird from going off the top of the screen
    if (self.y < 0) {
      self.y = 0;
      self.velocity = 0;
    }
  };
  self.flap = function () {
    self.velocity = self.lift;
  };
});
// Pipe class to handle the pipes
var Pipe = Container.expand(function () {
  var self = Container.call(this);
  var pipeGraphics = self.attachAsset('pipe', {
    anchorX: 0.5,
    anchorY: 0.5
  });
  self.speed = -5;
  self.update = function () {
    self.x += self.speed;
  };
  self.isOffScreen = function () {
    return self.x < -pipeGraphics.width;
  };
});

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

/****
* Game Code
****/
// Initialize game variables
var bird = game.addChild(new Bird());
bird.x = 2048 / 4;
bird.y = 2732 / 2;
var pipes = [];
var pipeSpacing = 600;
var pipeGap = 400;
var score = 0;
var scoreTxt = new Text2('0', {
  size: 150,
  fill: 0xFFFFFF
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Function to create a new set of pipes
function createPipes() {
  var pipeHeight = Math.random() * (2732 - pipeGap - 200) + 100;
  var topPipe = new Pipe();
  topPipe.y = pipeHeight - 2732;
  topPipe.x = 2048;
  pipes.push(topPipe);
  game.addChild(topPipe);
  var bottomPipe = new Pipe();
  bottomPipe.y = pipeHeight + pipeGap;
  bottomPipe.x = 2048;
  pipes.push(bottomPipe);
  game.addChild(bottomPipe);
}
// Handle screen tap to make the bird flap
game.down = function (x, y, obj) {
  bird.flap();
};
// Update game logic
game.update = function () {
  bird.update();
  // Create new pipes at intervals
  if (LK.ticks % 90 === 0) {
    createPipes();
  }
  // Update pipes and check for collisions
  for (var i = pipes.length - 1; i >= 0; i--) {
    pipes[i].update();
    // Check for collision with bird
    if (bird.intersects(pipes[i])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
      return;
    }
    // Remove pipes that are off screen and update score
    if (pipes[i].isOffScreen()) {
      pipes[i].destroy();
      pipes.splice(i, 1);
      score++;
      scoreTxt.setText(score);
    }
  }
  // Check if bird hits the ground
  if (bird.y > 2732) {
    LK.effects.flashScreen(0xff0000, 1000);
    LK.showGameOver();
  }
};