export function formatDate(date: string | Date): string {
  if (!date) return '';
  const d = typeof date === 'string' ? new Date(date) : date;

  const day = d.getDate();
  const month = d.toLocaleString('en-US', { month: 'long' });
  const year = d.getFullYear();
  const hours = d.getHours();
  const minutes = d.getMinutes().toString().padStart(2, '0');
  const ampm = hours >= 12 ? 'PM' : 'AM';
  const displayHours = hours % 12 || 12;

  const suffix = getOrdinalSuffix(day);

  return `${day}${suffix} ${month} ${year}, ${displayHours}:${minutes} ${ampm}`;
}

function getOrdinalSuffix(day: number): string {
  if (day > 3 && day < 21) return 'th';
  switch (day % 10) {
    case 1: return 'st';
    case 2: return 'nd';
    case 3: return 'rd';
    default: return 'th';
  }
}

export function formatDateTime(date: string | Date): string {
  return formatDate(date);
}

export function formatBytes(bytes: number): string {
  if (bytes === 0) return '0 Bytes';
  const k = 1024;
  const sizes = ['Bytes', 'KB', 'MB', 'GB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
}

export function getRelativeTime(date: string | Date | null): string {
  if (!date) return 'Never';

  const now = new Date();
  const past = new Date(date);
  const diffMs = now.getTime() - past.getTime();
  const diffMins = Math.floor(diffMs / 60000);
  const diffHours = Math.floor(diffMs / 3600000);
  const diffDays = Math.floor(diffMs / 86400000);

  if (diffMins < 1) return 'Just now';
  if (diffMins < 60) return `${diffMins}m ago`;
  if (diffHours < 24) return `${diffHours}h ago`;
  if (diffDays < 7) return `${diffDays}d ago`;
  return formatDate(date);
}