export function formatPrice(price: string | null | undefined, currency: string): string | null {
  if (!price) return null;
  const n = Number(price);
  if (Number.isNaN(n)) return `${price} ${currency}`;
  try {
    return new Intl.NumberFormat(undefined, {
      style: 'currency',
      currency,
      maximumFractionDigits: 2,
    }).format(n);
  } catch {
    return `${n.toLocaleString()} ${currency}`;
  }
}

export function formatDate(iso: string | Date): string {
  const d = typeof iso === 'string' ? new Date(iso) : iso;
  return d.toLocaleDateString(undefined, { day: 'numeric', month: 'short', year: 'numeric' });
}

export function daysLeftUntil(iso: string | Date, retentionDays: number): number {
  const d = typeof iso === 'string' ? new Date(iso) : iso;
  const expires = d.getTime() + retentionDays * 24 * 60 * 60 * 1000;
  return Math.max(0, Math.ceil((expires - Date.now()) / (24 * 60 * 60 * 1000)));
}