export function formatUptime(sec: string | null | undefined): string {
  if (!sec) return "—";
  const seconds = Number(sec);
  const days = Math.floor(seconds / 86400);
  const hours = Math.floor((seconds % 86400) / 3600);
  const minutes = Math.floor((seconds % 3600) / 60);
  if (days > 0) return `${days}d ${hours}h`;
  if (hours > 0) return `${hours}h ${minutes}m`;
  return `${minutes}m`;
}

export function formatBytes(bytes: string | null | undefined): string {
  if (!bytes) return "—";
  const value = Number(bytes);
  if (value >= 1e9) return `${(value / 1e9).toFixed(1)} GB`;
  if (value >= 1e6) return `${(value / 1e6).toFixed(0)} MB`;
  return `${(value / 1e3).toFixed(0)} KB`;
}

export function formatLastUpdated(value: string | null | undefined): string {
  if (!value) return "—";

  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return "—";

  const diffSeconds = Math.max(
    0,
    Math.floor((Date.now() - date.getTime()) / 1000),
  );
  if (diffSeconds < 60) return `${diffSeconds}s ago`;
  if (diffSeconds < 3600) return `${Math.floor(diffSeconds / 60)}m ago`;
  if (diffSeconds < 86400) return `${Math.floor(diffSeconds / 3600)}h ago`;
  return date.toLocaleString();
}

export function formatDateTime(value: string | null | undefined): string {
  if (!value) return "—";

  const date = new Date(value);
  if (Number.isNaN(date.getTime())) return value;

  return date.toLocaleString();
}