let settings = { publicBaseUrl: '', bookTitle: '' };

async function checkSession() {
  const res = await fetch('/api/session');
  const data = await res.json();
  if (data.role !== 'admin') {
    window.location.href = '/';
  }
}

async function loadSettings() {
  const res = await fetch('/api/settings');
  if (!res.ok) return;
  const data = await res.json();
  settings = data.settings || { publicBaseUrl: '', bookTitle: '' };
  document.getElementById('publicBaseUrl').value = settings.publicBaseUrl || '';
  document.getElementById('bookTitle').value = settings.bookTitle || '';
}

document.getElementById('saveSettingsBtn').addEventListener('click', async () => {
  const publicBaseUrl = document.getElementById('publicBaseUrl').value.trim();
  const bookTitle = document.getElementById('bookTitle').value.trim();
  const res = await fetch('/api/settings', {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ publicBaseUrl, bookTitle }),
  });
  const data = await res.json();
  if (res.ok) {
    settings = data.settings;
    const msg = document.getElementById('settingsSaved');
    msg.textContent = 'Gespeichert ✓';
    msg.classList.add('show');
    setTimeout(() => msg.classList.remove('show'), 1800);
  }
});

document.getElementById('logoutBtn').addEventListener('click', async () => {
  await fetch('/api/logout', { method: 'POST' });
  window.location.href = '/';
});

// --- Sichern & Wiederherstellen ---
function showTransferMsg(text, isError) {
  const box = document.getElementById('transferMsg');
  box.innerHTML = isError ? `<p class="error-msg">${text}</p>` : `<p class="saved-msg2 show">${text}</p>`;
}

document.getElementById('bookExportBtn').addEventListener('click', () => {
  window.location.href = '/api/book/export';
});

document.getElementById('bookImportBtn').addEventListener('click', async () => {
  const fileInput = document.getElementById('bookImportFile');
  const file = fileInput.files[0];
  if (!file) { showTransferMsg('Bitte zuerst eine ZIP-Datei auswählen.', true); return; }
  const replaceAll = document.getElementById('bookImportReplace').checked;
  if (replaceAll && !confirm('Wirklich ALLE bestehenden Freunde vor dem Import löschen?')) return;

  const fd = new FormData();
  fd.append('file', file);
  fd.append('replaceAll', replaceAll ? 'true' : 'false');
  showTransferMsg('Importiere...', false);
  const res = await fetch('/api/book/import', { method: 'POST', body: fd });
  const data = await res.json();
  if (res.ok) {
    showTransferMsg(`${data.imported.length} Freund(e) importiert: ${data.imported.join(', ') || '–'}`, false);
    fileInput.value = '';
  } else {
    showTransferMsg(data.error || 'Import fehlgeschlagen.', true);
  }
});

document.getElementById('friendImportBtn').addEventListener('click', async () => {
  const fileInput = document.getElementById('friendImportFile');
  const file = fileInput.files[0];
  if (!file) { showTransferMsg('Bitte zuerst eine ZIP-Datei auswählen.', true); return; }
  const fd = new FormData();
  fd.append('file', file);
  showTransferMsg('Importiere...', false);
  const res = await fetch('/api/friends/import', { method: 'POST', body: fd });
  const data = await res.json();
  if (res.ok) {
    showTransferMsg(`"${data.friend.name}" wurde importiert.`, false);
    fileInput.value = '';
  } else {
    showTransferMsg(data.error || 'Import fehlgeschlagen.', true);
  }
});

checkSession();
loadSettings();