export function formatBytes(bytes: number): string {
  if (bytes === 0) return '0 B';
  const units = ['B', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.floor(Math.log(bytes) / Math.log(1024));
  const val = bytes / Math.pow(1024, i);
  return `${val.toFixed(i === 0 ? 0 : 1)} ${units[i]}`;
}

export function formatNumber(n: number): string {
  return n.toLocaleString();
}

export function timeAgo(dateStr: string): string {
  const seconds = Math.floor((Date.now() - new Date(dateStr).getTime()) / 1000);
  if (seconds < 60) return `${seconds}s ago`;
  const minutes = Math.floor(seconds / 60);
  if (minutes < 60) return `${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`;
}

export function truncateHash(hash: string, len = 12): string {
  if (hash.startsWith('sha256:')) {
    return hash.slice(0, 7 + len);
  }
  return hash.slice(0, len);
}