const AUDIT_DATE_PATTERN = /\b\d{1,2}\/\d{1,2}(\/\d{2,4})?\b/;

/**
 * Every entry, manual or system, shows a complete timestamp — `09/15/2026 · 7:42 PM`.
 * Pre-formatted API strings are kept only when they already carry a calendar date.
 */
export function formatAuditTimestamp(value: string): string {
  if (!value) return "";
  if (AUDIT_DATE_PATTERN.test(value) && /\b(AM|PM)\b/i.test(value)) return value;

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

  const datePart = date.toLocaleDateString("en-US", {
    month: "2-digit",
    day: "2-digit",
    year: "numeric",
  });
  const timePart = date.toLocaleTimeString("en-US", {
    hour: "numeric",
    minute: "2-digit",
  });
  return `${datePart} · ${timePart}`;
}