public function index()
  {
    if(!empty($_GET['id']) && !empty(Auth::getInstance()->getUserById(htmlspecialchars(trim($_GET['id'])))))
    {
      $id = htmlspecialchars(trim($_GET['id']));
      $articles = $this->model->getArticleFromAuthor($id);
      if(isset($_POST['submit']) && $_SESSION['userID'] == $id)
      {
        if(
            !empty($_POST['firstname'])
            && !empty($_POST['lastname'])
            && !empty($_POST['username'])
            && !empty($_POST['email'])
          )
          {
            $firstname = htmlspecialchars($_POST['firstname']);
            $lastname= htmlspecialchars($_POST['lastname']);
            $username = htmlspecialchars($_POST['username']);
            $email = htmlspecialchars($_POST['email']);
            if(empty($_POST['currentPassword']) && empty($_POST['newPassword']) && empty($_POST['confirmPassword']))
            {
              $this->model->updateProfile($firstname, $lastname, $username, $email);
            }
            else
            {
              if(!empty($_POST['currentPassword']) && !empty($_POST['newPassword']) && !empty($_POST['confirmPassword']))
              {
                $currentPassword = htmlspecialchars($_POST['currentPassword']);
                $newPassword= htmlspecialchars($_POST['newPassword']);
                $confirmPassword = htmlspecialchars($_POST['confirmPassword']);
                $user = Auth::getInstance()->getUserById(htmlspecialchars(trim($_SESSION['userID'])), true);

                  if(password_verify($currentPassword, $user['password']))
                  {
                    if($newPassword == $confirmPassword)
                    {
                      $newPassword = password_hash($newPassword, PASSWORD_BCRYPT, ['cost' => 12]);
                      $this->model->updateProfile($firstname, $lastname, $username, $email, $newPassword);
                    }
                  }else
                  {
                      $error = 'Mot de passe incorrect';
                  }
              }else
              {
                $error = 'Veuillez remplir tous les champs du changement de votre mot de passe';
              }
            }
          }else
          {
              $error = 'Vous devez au minimum remplir tous les champs excepté le mot de passe';
          }

          if(empty($error))
          {
            $this->render('index',['user' => Auth::getInstance()->getUserById($id), 'articles' => $articles, 'success' => true]);
          }else
          {
            $this->render('index',['user' => Auth::getInstance()->getUserById($id), 'articles' => $articles, 'error' => $error]);
          }
      }else
      {
        $this->render('index',['user' => Auth::getInstance()->getUserById($id), 'articles' => $articles]);
      }
    }else
    {
      header('Location:dashboard');
    }
  }