// Mirrors the backend's own USt-IdNr. validation exactly (Orders.ts/
// Customers.ts/CompanySettings.ts in the Payload repo) — kept as a plain
// client+server-safe helper here since this repo's frontend needs the same
// check twice (checkout's instant client-side pattern + api/checkout's own
// server-side re-validation, same "never trust the client" reasoning as
// every other checkout field).
const VAT_ID_PATTERN = /^[A-Z]{2}[A-Z0-9]{2,12}$/;

export function normalizeVatId(value: string): string {
  return value.toUpperCase().trim();
}

export function isValidVatId(value: string): boolean {
  return VAT_ID_PATTERN.test(value);
}