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/*
 * App Core Class
 * Creates URL & loads core controller
 * URL FORMAT - /controller/method/params
 */
class App {
  protected $currentController = 'Pages';
  protected $currentMethod = 'index';
  protected $params = [];

  public function __construct(){
    $url = $this->getUrl();

    // Look in controllers for first value using APPROOT absolute path
    if(isset($url[0]) && file_exists(APPROOT . '/controllers/' . ucwords($url[0]). '.php')){
      // If exists, set as controller
      $this->currentController = ucwords($url[0]);
      // Unset 0 Index
      unset($url[0]);
    }

    // Require the controller using APPROOT absolute path
    require_once APPROOT . '/controllers/'. $this->currentController . '.php';

    // Instantiate controller class
    $this->currentController = new $this->currentController;

    // Check for second part of url
    if(isset($url[1])){
      // Check to see if method exists in controller
      if(method_exists($this->currentController, $url[1])){
        $this->currentMethod = $url[1];
        // Unset 1 index
        unset($url[1]);
      }
    }

    // Get params
    $this->params = $url ? array_values($url) : [];

    // Call a callback with array of params
    call_user_func_array([$this->currentController, $this->currentMethod], $this->params);
  }

  public function getUrl(){
    if(isset($_GET['url'])){
      $url = rtrim($_GET['url'], '/');
      $url = filter_var($url, FILTER_SANITIZE_URL);
      $url = explode('/', $url);
      return $url;
    }
    return [];
  }
}