/****
* Classes
****/
// Define the Hero class
var Hero = Container.expand(function () {
  var self = Container.call(this);
  var heroGraphics = self.createAsset('hero', 'Hero character', 0.5, 0.5);
  self.speedY = 0;
  self.gravity = 0.5;
  self.lift = -10;
  // Update the hero's position
  self.update = function () {
    self.speedY += self.gravity;
    self.y += self.speedY;
    // Prevent the hero from moving off-screen
    if (self.y > game.height - heroGraphics.height / 2) {
      self.y = game.height - heroGraphics.height / 2;
      self.speedY = 0;
    } else if (self.y < heroGraphics.height / 2) {
      self.y = heroGraphics.height / 2;
      self.speedY = 0;
    }
  };
  // Make the hero jump
  self.jump = function () {
    self.speedY = self.lift;
  };
});
// Define the Obstacle class
var Obstacle = Container.expand(function (x, y, color) {
  var self = Container.call(this);
  var obstacleGraphics = self.createAsset('obstacle', 'Obstacle', 0.5, 0.5);
  obstacleGraphics.tint = color;
  self.x = x;
  self.y = y;
  // Move the obstacle
  self.move = function () {
    self.x -= 5;
  };
  // Check if the obstacle is off-screen
  self.isOffScreen = function () {
    return self.x < -obstacleGraphics.width;
  };
});

/****
* Initialize Game
****/
var game = new LK.Game({
  backgroundColor: 0x000000 // Init game with black background
});

/****
* Game Code
****/
// Initialize important asset arrays and game variables
var hero;
var obstacles = [];
var colors = [0xFF0000, 0x00FF00, 0x0000FF]; // Red, Green, Blue
var score = 0;
var scoreTxt;
var obstacleTimer = 0;
var gameOver = false;
// Create the hero
hero = game.addChild(new Hero());
hero.x = game.width / 4;
hero.y = game.height / 2;
// Create the score text
scoreTxt = new Text2('0', {
  size: 150,
  fill: "#ffffff"
});
scoreTxt.anchor.set(0.5, 0);
LK.gui.top.addChild(scoreTxt);
// Handle the tap event to make the hero jump
game.on('down', function (obj) {
  if (!gameOver) {
    hero.jump();
  }
});
// Game tick event
LK.on('tick', function () {
  if (!gameOver) {
    // Update the hero
    hero.update();
    // Add a new obstacle every 120 frames (2 seconds)
    obstacleTimer++;
    if (obstacleTimer === 120) {
      obstacleTimer = 0;
      var color = colors[Math.floor(Math.random() * colors.length)];
      var obstacle = new Obstacle(game.width, Math.random() * game.height, color);
      obstacles.push(obstacle);
      game.addChild(obstacle);
    }
    // Update obstacles
    for (var i = obstacles.length - 1; i >= 0; i--) {
      obstacles[i].move();
      // Check for collision
      if (hero.intersects(obstacles[i])) {
        gameOver = true;
        LK.effects.flashScreen(0xff0000, 1000);
        LK.showGameOver();
      }
      // Remove off-screen obstacles
      if (obstacles[i].isOffScreen()) {
        obstacles[i].destroy();
        obstacles.splice(i, 1);
        // Increment score when obstacles go off-screen
        score++;
        scoreTxt.setText(score.toString());
      }
    }
  }
});