type BusinessOption = {
  id: string;
  isDefault?: boolean | null;
};

export function pickDefaultBusinessId(businesses: BusinessOption[] | undefined): string {
  if (!businesses?.length) return "";
  return businesses.find((business) => business.isDefault)?.id ?? businesses[0]!.id;
}

export function resolveInvoiceBusinessId(
  explicitId: string | null | undefined,
  businesses: BusinessOption[] | undefined,
): string {
  if (explicitId?.trim()) return explicitId.trim();
  return pickDefaultBusinessId(businesses);
}