import type { Quiz } from "@/lib/api";

export const KIND_LABEL: Record<Quiz["target_kind"], string> = {
  chapter: "Book chapter",
  lecture: "Lecture",
  conversation: "Conversation",
  standalone: "Stand-alone",
};

/**
 * "8.4s" / "1m 12s" / "3h 20m" / "2d 4h" — response times read better than
 * raw milliseconds. Hours past 23h 59m roll up into days. Mirrors fmtMs in
 * the app's quiz-result-view.tsx.
 */
export function fmtMs(ms: number | null | undefined): string {
  if (ms == null) return "—";
  // Below 59.95s: one decimal place (anything higher would print "60.0s").
  if (ms < 59_950) return `${(ms / 1000).toFixed(1)}s`;
  // Whole seconds from here, so rounding can't print "1m 60s".
  const total = Math.round(ms / 1000);
  const d = Math.floor(total / 86_400);
  const h = Math.floor((total % 86_400) / 3600);
  const m = Math.floor((total % 3600) / 60);
  const s = total % 60;
  // The two largest units: 2d 4h · 3h 20m · 12m 5s.
  if (d > 0) return `${d}d ${h}h`;
  if (h > 0) return `${h}h ${m}m`;
  return `${m}m ${s}s`;
}