// An editing timecode: to the tenth of a second, the precision a cut is marked at (the editor's
// segment fields, the clip panel's In / Out). Hours appear only when the item reaches an hour, so a
// short's "0:12.4" stays short and a film reads "1:02:03.4". `formatDuration` is the whole-second
// clock for a card or a player bar; this one is for a field someone types a cut into.

/** `s` as `m:ss.d`, or `h:mm:ss.d` when `hours` (pass `duration >= 3600` so one item's fields agree). */
export function formatTimecode(s: number, hours = false): string {
  if (!isFinite(s) || s < 0) s = 0;
  const tenths = Math.round(s * 10);
  const h = Math.floor(tenths / 36000);
  const m = Math.floor((tenths % 36000) / 600);
  const sec = ((tenths % 600) / 10).toFixed(1).padStart(4, "0");
  return hours || h > 0 ? `${h}:${String(m).padStart(2, "0")}:${sec}` : `${m}:${sec}`;
}

/** A typed timecode back to seconds: `h:mm:ss.d`, `m:ss.d` or bare seconds, its decimal a point or
 *  a comma (how a Hungarian hand writes one). Null when it is not one. */
export function parseTimecode(v: string): number | null {
  const parts = v
    .trim()
    .replace(/,(\d*)$/, ".$1")
    .split(":");
  if (parts.length > 3 || parts.some((p) => p.trim() === "")) return null;
  let total = 0;
  for (const p of parts) {
    const n = Number(p);
    if (!isFinite(n) || n < 0) return null;
    total = total * 60 + n;
  }
  return total;
}