<?php
namespace admin;

class Site
{
  // define APP_SECRET_KEY
  const APP_SECRET_KEY = 'c3cb2537d25c0efc9e573d059d79c3b8';

  static public function finalize_admin_login( array $user, string $domain, string $cookie_name, bool $remember = false ) {

    \S::set_session( 'user', $user );
    \S::delete_session( 'twofa_pending' );

    if ( $remember ) {
      $payloadArr = [
        'login' => $user['login'],
        'ts'    => time()
      ];

      $json = json_encode($payloadArr, JSON_UNESCAPED_SLASHES);
      $sig  = hash_hmac('sha256', $json, self::APP_SECRET_KEY);
      $payload = base64_encode($json . '.' . $sig);

      setcookie( $cookie_name, $payload, [
        'expires'  => time() + (86400 * 14),
        'path'     => '/',
        'domain'   => $domain,
        'secure'   => true,
        'httponly' => true,
        'samesite' => 'Lax',
      ]);
    }
  }

  public static function special_actions()
  {
    $sa = \S::get('s-action');
    $domain = preg_replace('/^www\./', '', $_SERVER['SERVER_NAME']);
    $cookie_name = 'admin_remember_' . str_replace( '.', '-', $domain );

    switch ($sa)
    {
      case 'user-logon':
      {
        $login = \S::get('login');
        $pass  = \S::get('password');

        $result = \admin\factory\Users::logon($login, $pass);

        if ( $result == 1 )
        {
          $user = \admin\factory\Users::details($login);

          if ( $user['twofa_enabled'] == 1 )
          {
            \S::set_session( 'twofa_pending', [
              'uid'      => (int)$user['id'],
              'login'    => $login,
              'remember' => (bool)\S::get('remember'),
              'started'  => time(),
            ] );

            if ( !\admin\factory\Users::send_twofa_code( (int)$user['id'] ) )
            {
              \S::alert('Nie udało się wysłać kodu 2FA. Spróbuj ponownie.');
              \S::delete_session('twofa_pending');
              header('Location: /admin/');
              exit;
            }

            header('Location: /admin/user/twofa/');
            exit;
          }
          else
          {
            $user = \admin\factory\Users::details($login);

            self::finalize_admin_login(
              $user,
              $domain,
              $cookie_name,
              (bool)\S::get('remember')
            );

            header('Location: /admin/articles/view_list/');
            exit;
          }
        }
        else
        {
          if ($result == -1)
          {
            \S::alert('Z powodu 5 nieudanych prób Twoje konto zostało zablokowane.');
          }
          else
          {
            \S::alert('Podane hasło jest nieprawidłowe lub użytkownik nie istnieje.');
          }
          header('Location: /admin/');
          exit;
        }
      }
      break;

      case 'user-2fa-verify':
      {
        $pending = \S::get_session('twofa_pending');
        if ( !$pending || empty( $pending['uid'] ) ) {
          \S::alert('Sesja 2FA wygasła. Zaloguj się ponownie.');
          header('Location: /admin/');
          exit;
        }

        $code = trim((string)\S::get('twofa'));
        if (!preg_match('/^\d{6}$/', $code))
        {
          \S::alert('Nieprawidłowy format kodu.');
          header('Location: /admin/user/twofa/');
          exit;
        }

        $ok = \admin\factory\Users::verify_twofa_code((int)$pending['uid'], $code);
        if (!$ok)
        {
          \S::alert('Błędny lub wygasły kod.');
          header('Location: /admin/user/twofa/');
          exit;
        }

        // 2FA OK — finalna sesja
        $user = \admin\factory\Users::details($pending['login']);

        self::finalize_admin_login(
          $user,
          $domain,
          $cookie_name,
          $pending['remember'] ? true : false
        );

        header('Location: /admin/articles/view_list/');
        exit;
      }
      break;

      case 'user-2fa-resend':
      {
        $pending = \S::get_session('twofa_pending');
        if (!$pending || empty($pending['uid']))
        {
          \S::alert('Sesja 2FA wygasła. Zaloguj się ponownie.');
          header('Location: /admin/');
          exit;
        }

        if (!\admin\factory\Users::send_twofa_code((int)$pending['uid'], true))
        {
          \S::alert('Kod można wysłać ponownie po krótkiej przerwie.');
        }
        else
        {
          \S::alert('Nowy kod został wysłany.');
        }
        header('Location: /admin/user/twofa/');
        exit;
      }
      break;

      case 'user-logout':
      {
        setcookie($cookie_name, "", [
          'expires'  => time() - 86400,
          'path'     => '/',
          'domain'   => $domain,
          'secure'   => true,
          'httponly' => true,
          'samesite' => 'Lax',
        ]);
        \S::delete_session('twofa_pending');
        session_destroy();
        header('Location: /admin/');
        exit;
      }
      break;
    }
  }

  public static function route()
  {
    $_SESSION['admin'] = true;

		if ( \S::get( 'p' ) )
			\S::set_session( 'p' , \S::get( 'p' ) );

		$page = \S::get_session( 'p' );

    $class = '\admin\controls\\';

    $results = explode( '_', \S::get( 'module' ) );
    if ( is_array( $results ) ) foreach ( $results as $row )
      $class .= ucfirst( $row );

    $action = \S::get( 'action' );

    if ( class_exists( $class ) and method_exists( new $class, $action ) )
      return call_user_func_array( array( $class, $action ), array() );
    else
    {
      \S::alert( 'Nieprawidłowy adres url.' );
      return false;
    }
  }

  static public function update()
  {
    global $mdb;

    if ( $results = $mdb -> select( 'pp_updates', [ 'name' ], [ 'done' => 0 ] ) )
    {
      foreach ( $results as $row )
      {
        $class = '\admin\factory\Update';
        $method = $row['name'];

        if ( class_exists( $class ) and method_exists( new $class, $method ) )
          call_user_func_array( array( $class, $method ), array() );
      }
    }
  }
}