/****
* Classes
****/
// Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
  self.speed = 5;
  self.jumpPower = -15;
  self.gravity = 0.5;
  self.isJumping = false;
  self.velocityY = 0;
  self.update = function () {
    // Apply gravity
    if (self.isJumping) {
      self.velocityY += self.gravity;
      self.y += self.velocityY;
      if (self.y > game.height - heroGraphics.height / 2) {
        self.isJumping = false;
        self.y = game.height - heroGraphics.height / 2;
      }
    }
  };
  self.jump = function () {
    if (!self.isJumping) {
      self.isJumping = true;
      self.velocityY = self.jumpPower;
    }
  };
});
// Obstacle class
var Obstacle = Container.expand(function () {
  var self = Container.call(this);
  var obstacleGraphics = self.createAsset('obstacle', 'Obstacle', 0.5, 1);
  self.speed = -6;
  self.move = function () {
    self.x += self.speed;
  };
});
/****
* Initialize Game
****/
var game = new LK.Game({
  backgroundColor: 0x000000 // Init game with black background
});
/****
* Game Code
****/
// Initialize hero
var hero = game.addChild(new Hero());
hero.x = game.width / 4;
hero.y = game.height - hero.height / 2;

// Initialize obstacles array
var obstacles = [];

// Initialize score
var score = 0;
var scoreTxt = new Text2(score.toString(), {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);

// Game tick event
LK.on('tick', function () {
  // Update hero
  hero.update();

  // Move and check obstacles
  for (var i = obstacles.length - 1; i >= 0; i--) {
    obstacles[i].move();
    // Check for collision with hero
    if (hero.intersects(obstacles[i])) {
      LK.effects.flashScreen(0xff0000, 1000);
      LK.showGameOver();
      return;
    }
    // Remove off-screen obstacles
    if (obstacles[i].x < -obstacles[i].width) {
      obstacles[i].destroy();
      obstacles.splice(i, 1);
    }
  }

  // Increment score
  score++;
  scoreTxt.setText(score.toString());

  // Add new obstacles
  if (LK.ticks % 120 == 0) {
    var obstacle = new Obstacle();
    obstacle.x = game.width;
    obstacle.y = game.height;
    obstacles.push(obstacle);
    game.addChild(obstacle);
  }
});

// Touch event to make the hero jump
game.on('down', function (obj) {
  hero.jump();
});