export function formatRial(amount: number): string {
  return new Intl.NumberFormat('fa-IR').format(amount) + ' تومان';
}

export function formatNumber(n: number): string {
  return new Intl.NumberFormat('fa-IR').format(n);
}

export function formatDate(dateStr: string | null | undefined): string {
  if (!dateStr) return '—';
  try {
    return new Intl.DateTimeFormat('fa-IR', {
      year: 'numeric',
      month: '2-digit',
      day: '2-digit',
    }).format(new Date(dateStr));
  } catch {
    return dateStr;
  }
}

export function formatDateTime(dateStr: string | null | undefined): string {
  if (!dateStr) return '—';
  try {
    return new Intl.DateTimeFormat('fa-IR', {
      year: 'numeric',
      month: '2-digit',
      day: '2-digit',
      hour: '2-digit',
      minute: '2-digit',
    }).format(new Date(dateStr));
  } catch {
    return dateStr;
  }
}

export function maskMobile(mobile: string): string {
  if (mobile.length < 7) return mobile;
  return mobile.slice(0, 4) + '***' + mobile.slice(-3);
}

export function cn(...classes: (string | undefined | null | false)[]): string {
  return classes.filter(Boolean).join(' ');
}