/* One way of saying when something happened, shared by every pack component.
 * Relative while recent ("3h ago" is what a person wants about a note), a date
 * once old ("47d ago" is arithmetic nobody asked for). `fullTime` is for the
 * tooltip: a review is a record, and the record must be readable exactly. */

export function relTime(iso: string | null | undefined): string {
  if (!iso) return "";
  const then = new Date(iso).getTime();
  if (Number.isNaN(then)) return "";
  const mins = Math.max(0, Math.round((Date.now() - then) / 60000));
  if (mins < 1) return "just now";
  if (mins < 60) return `${mins}m ago`;
  const hrs = Math.round(mins / 60);
  if (hrs < 24) return `${hrs}h ago`;
  const days = Math.round(hrs / 24);
  if (days < 7) return `${days}d ago`;
  return new Date(then).toLocaleDateString(undefined, { day: "numeric", month: "short" });
}

export function fullTime(iso: string | null | undefined): string {
  if (!iso) return "";
  const d = new Date(iso);
  return Number.isNaN(d.getTime()) ? "" : d.toLocaleString();
}