async function register({ registerHook, peertubeHelpers }) {
  try {
    function saveReturnUrlBeforeLogin() {
      try {
        var currentPath = window.location.pathname + window.location.search + window.location.hash;
        if (currentPath && !window.location.pathname.includes('/login')) {
          localStorage.setItem('yaktube_return_url', currentPath);
          localStorage.setItem('yaktube_return_url_time', String(Date.now()));
          sessionStorage.setItem('yaktube_return_url', currentPath);
          sessionStorage.setItem('redirect-url-after-login', currentPath);
        }
      } catch (e) {}
    }

    function checkPendingPostLoginRedirect() {
      try {
        if (window.location.pathname.includes('/login')) return;
        var token = localStorage.getItem('access_token');
        if (!token) return;
        var savedUrl =
          localStorage.getItem('yaktube_return_url') ||
          sessionStorage.getItem('yaktube_return_url') ||
          sessionStorage.getItem('redirect-url-after-login');
        if (!savedUrl) return;
        var savedTime = parseInt(localStorage.getItem('yaktube_return_url_time') || '0', 10);
        localStorage.removeItem('yaktube_return_url');
        localStorage.removeItem('yaktube_return_url_time');
        sessionStorage.removeItem('yaktube_return_url');
        sessionStorage.removeItem('redirect-url-after-login');
        if (savedTime && Date.now() - savedTime > 15 * 60 * 1000) return;
        var currentFull = window.location.pathname + window.location.search + window.location.hash;
        if (
          typeof savedUrl === 'string' &&
          savedUrl.startsWith('/') &&
          !savedUrl.startsWith('//') &&
          !savedUrl.startsWith('/login') &&
          savedUrl !== currentFull
        ) {
          window.location.replace(savedUrl);
        }
      } catch (e) {}
    }

    checkPendingPostLoginRedirect();
    window.addEventListener('popstate', checkPendingPostLoginRedirect);
    setInterval(checkPendingPostLoginRedirect, 800);

    fetch('/plugins/auth-yaknet/router/status')
      .then(function (r) {
        return r.json();
      })
      .then(function (status) {
        if (!status || status.autoRedirectLogin === false) {
          return; // Auto redirect is disabled by administrator
        }

        var isLoginUrl = window.location.pathname.includes('/login');
        var isLocal = window.location.search.includes('local=true');
        var isError = window.location.search.includes('externalAuthError');
        var isExternalToken = window.location.search.includes('externalAuthToken');

        // CRITICAL: Never intercept /login when PeerTube is completing the externalAuthToken handshake!
        if (isLoginUrl && !isLocal && !isError && !isExternalToken) {
          window.location.replace('/plugins/auth-yaknet/router/auth');
          return;
        }

        // Intercept clicks on login links/buttons
        document.addEventListener(
          'click',
          function (e) {
            var el = e.target;
            if (el && el.closest) {
              var isLoginBtn = el.closest(
                'my-login-link, .login-button, a[href*="/login"]:not(#yaktube-show-admin-login), a[aria-label*="Giriş"], a[title*="Giriş"], a[title*="login"], a[aria-label*="login"]'
              );
              if (
                isLoginBtn &&
                !window.location.search.includes('local=true') &&
                !window.location.search.includes('externalAuthToken')
              ) {
                e.preventDefault();
                e.stopPropagation();
                saveReturnUrlBeforeLogin();
                window.location.href = '/plugins/auth-yaknet/router/auth';
              }
            }
          },
          true
        );
      })
      .catch(function () {});

    // Alt+A shortcut for local admin login bypass
    document.addEventListener('keydown', function (e) {
      if (e.altKey && (e.key === 'a' || e.key === 'A')) {
        if (!window.location.pathname.includes('/login')) {
          window.location.href = '/login?local=true';
        }
      }
    });
  } catch (err) {
    console.warn('[YakNet SSO] Client init error:', err);
  }
}

export { register, register as registerClient };
export default register;