const form = document.getElementById('register-form');
const formError = document.getElementById('form-error');
const successBlock = document.getElementById('success');
const closedBanner = document.getElementById('closed-banner');
const submitBtn = document.getElementById('submit-btn');

let config = {};

async function loadConfig() {
  const res = await fetch('/api/config');
  config = await res.json();

  document.getElementById('footer-login').href = config.nextcloudUrl;
  document.getElementById('login-link').href = config.nextcloudUrl;

  if (config.allowedEmailDomains?.length) {
    document.getElementById('email-hint').textContent =
      `Только: ${config.allowedEmailDomains.join(', ')}`;
  }

  if (!config.enabled) {
    closedBanner.classList.remove('hidden');
    form.classList.add('hidden');
    submitBtn.disabled = true;
  }
}

form.addEventListener('submit', async (e) => {
  e.preventDefault();
  formError.classList.add('hidden');

  const username = document.getElementById('username').value.trim();
  const password = document.getElementById('password').value;
  const password2 = document.getElementById('password2').value;
  const email = document.getElementById('email').value.trim();
  const displayName = document.getElementById('displayName').value.trim();

  if (password !== password2) {
    formError.textContent = 'Пароли не совпадают';
    formError.classList.remove('hidden');
    return;
  }

  submitBtn.disabled = true;
  submitBtn.textContent = 'Создание…';

  try {
    const res = await fetch('/api/register', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ username, password, email, displayName }),
    });
    const data = await res.json();
    if (!res.ok) throw new Error(data.error || 'Ошибка');

    form.classList.add('hidden');
    successBlock.classList.remove('hidden');
    document.getElementById('success-user').textContent = username;
    document.getElementById('login-link').href = data.loginUrl || config.nextcloudUrl;
  } catch (err) {
    formError.textContent = err.message;
    formError.classList.remove('hidden');
    submitBtn.disabled = false;
    submitBtn.textContent = 'Зарегистрироваться';
  }
});

loadConfig().catch(() => {
  formError.textContent = 'Не удалось загрузить настройки';
  formError.classList.remove('hidden');
});