export function formatTRY(amount: number): string {
  return new Intl.NumberFormat("tr-TR", {
    style: "currency",
    currency: "TRY",
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  }).format(amount);
}

export function formatCurrency(amount: number, currency = "TRY"): string {
  return new Intl.NumberFormat("tr-TR", {
    style: "currency",
    currency,
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  }).format(amount);
}

export function formatDate(iso: string | undefined | null): string {
  if (!iso) return "—";
  return new Date(iso).toLocaleDateString("tr-TR", {
    day: "2-digit",
    month: "short",
    year: "numeric",
  });
}

export function formatDateTime(iso: string | undefined | null): string {
  if (!iso) return "—";
  return new Date(iso).toLocaleString("tr-TR", {
    day: "2-digit",
    month: "short",
    year: "numeric",
    hour: "2-digit",
    minute: "2-digit",
  });
}

export const BILLING_PERIOD_LABEL: Record<string, string> = {
  monthly: "Aylık",
  yearly: "Yıllık",
  onetime: "Tek seferlik",
};