export interface LrcLine {
  time: number;
  text: string;
}

const STAMP = /\[(\d+):(\d{1,2}(?:\.\d+)?)\]/g;

/** Parses LRC timed lyrics: metadata tags and untimed lines are skipped, output is sorted by time. */
export function parseLrc(text: string): LrcLine[] {
  const lines: LrcLine[] = [];
  for (const raw of text.split(/\r?\n/)) {
    const stamps = [...raw.matchAll(STAMP)];
    if (stamps.length === 0) continue;
    const lyric = raw.replace(STAMP, "").trim();
    for (const [, min, sec] of stamps) {
      lines.push({ time: Math.round((Number(min) * 60 + Number(sec)) * 1000) / 1000, text: lyric });
    }
  }
  return lines.sort((a, b) => a.time - b.time);
}