export function formatDate(
  date: string | Date,
  style: 'short' | 'long' | 'relative' = 'short'
): string {
  const d = typeof date === 'string' ? new Date(date) : date;

  if (style === 'short') {
    return d.toLocaleDateString('en-US', {
      month: 'short',
      day: 'numeric',
      year: 'numeric',
    });
  }

  if (style === 'long') {
    return d.toLocaleDateString('en-US', {
      weekday: 'long',
      month: 'long',
      day: 'numeric',
      year: 'numeric',
    });
  }

  // relative
  const diff = Date.now() - d.getTime();
  const seconds = Math.floor(diff / 1000);
  if (seconds < 60) return 'just now';
  const minutes = Math.floor(seconds / 60);
  if (minutes < 60) return `${minutes}m ago`;
  const hours = Math.floor(minutes / 60);
  if (hours < 24) return `${hours}h ago`;
  const days = Math.floor(hours / 24);
  return `${days}d ago`;
}