export function formatDate(iso: string | null | undefined): string {
  if (!iso) return "—";
  return new Date(iso).toLocaleDateString("en-MY", {
    day: "2-digit",
    month: "short",
    year: "numeric",
  });
}

export function formatDateTime(iso: string | null | undefined): string {
  if (!iso) return "—";
  return new Date(iso).toLocaleString("en-MY", {
    day: "2-digit",
    month: "short",
    year: "numeric",
    hour: "2-digit",
    minute: "2-digit",
  });
}

// value for <input type="datetime-local">
export function toLocalInput(iso: string | null | undefined): string {
  if (!iso) return "";
  const d = new Date(iso);
  const pad = (n: number) => String(n).padStart(2, "0");
  return `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}T${pad(
    d.getHours()
  )}:${pad(d.getMinutes())}`;
}

export function timeAgo(iso: string): string {
  const diff = Date.now() - new Date(iso).getTime();
  const mins = Math.floor(diff / 60000);
  if (mins < 1) return "just now";
  if (mins < 60) return `${mins}m ago`;
  const hrs = Math.floor(mins / 60);
  if (hrs < 24) return `${hrs}h ago`;
  const days = Math.floor(hrs / 24);
  if (days < 30) return `${days}d ago`;
  return formatDate(iso);
}