export interface AdminSettings {
  cartExpiryHours: number;
  verifyTokenHours: number;
  passwordResetHours: number;
  greetingFormat: string;
  greetingFallback: string;
}

export async function fetchAdminSettings(): Promise<AdminSettings> {
  const res = await fetch('/api/admin/settings');
  if (!res.ok) throw new Error('Could not load settings');
  return res.json();
}

export async function updateAdminSettings(settings: AdminSettings): Promise<AdminSettings> {
  const res = await fetch('/api/admin/settings', {
    method: 'PUT',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(settings)
  });
  const body = await res.json();
  // The refusal names the field that was rejected, and it is the only useful
  // thing to say. Without this check a 400 was returned as though it were the
  // saved settings, and the form reported success for a save the server refused.
  if (!res.ok) throw new Error(body?.error || 'Could not save settings');
  return body;
}