export function formatAmount(amount: number, currency: string) {
  const abs = Math.abs(amount);
  if (currency === 'BTC') return abs.toFixed(8);
  if (currency === 'XMR') return abs.toFixed(4);
  if (currency === 'USD') {
    return `$${abs.toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
  }
  return `₡${abs.toLocaleString('es-CR', { minimumFractionDigits: 2, maximumFractionDigits: 2 })}`;
}

export function formatLocalDatetime(d: Date): string {
  const pad = (n: number) => n.toString().padStart(2, '0');
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

export function formatDate(dateStr: string) {
  return new Date(dateStr).toLocaleDateString('en-US', { month: 'short', day: 'numeric' });
}