// ── Audiobook quote segmentation ────────────────────────────────────────────
// Quote-boundary segmentation and conservative turn-taking are kept separate
// from the live LLM casting workflow. Their shared quote/heuristic helpers are
// resolved when a passage is processed, preserving the legacy global API.
(function (root) {

function _abImplausibleDialoguePiece(text) {
  const t = String(text || '').trim();
  if (!t) return true;
  const words = t.split(/\s+/).filter(Boolean);
  return words.length === 1 && !/[.!?…]["'’”»]?$/.test(t);
}

function audiobookSplitByQuotes(text) {
  const spans = [];
  let next = 0;
  while (next < text.length) {
    const i = next++;
    const open = text[i], close = AB_QUOTE_PAIRS[open];
    if (!close) continue;
    const minStart = spans.length ? spans[spans.length - 1].end : 0;
    const orphan = _abOrphanClosingQuoteSpan(text, i, minStart);
    if (orphan) { spans.push(orphan); next = orphan.end; continue; }
    if ((open === '«' || open === '»') && i > 0 && !/[\s([{—–-]/.test(text[i - 1])) continue;
    const raw = text.slice(i + 1);
    const closeIdx = raw.indexOf(close);
    const endInRaw = _abUnclosedQuoteEnd(raw, closeIdx);
    const quote = raw.slice(0, endInRaw).trim();
    if (!quote) continue;
    const consumedClose = closeIdx >= 0 && endInRaw === closeIdx;
    spans.push({ start: i, end: i + 1 + endInRaw + (consumedClose ? 1 : 0), quote });
    next = spans[spans.length - 1].end;
  }
  if (!spans.length) return [{ speaker: 'Narrator', type: 'narration', text, emotion: '' }];
  const out = []; let last = 0;
  for (let k = 0; k < spans.length; k++) {
    const sp = spans[k], pre = text.slice(last, sp.start);
    if (pre.trim()) out.push({ speaker: 'Narrator', type: 'narration', text: pre.trim(), emotion: '' });
    if (sp.quote) {
      const after = text.slice(sp.end, k + 1 < spans.length ? spans[k + 1].start : text.length);
      out.push({ speaker: audiobookGuessSpeaker(after, pre) || 'Unknown', type: 'dialogue', text: sp.quote, emotion: '' });
    }
    last = sp.end;
  }
  const tail = text.slice(last).trimEnd();
  if (tail.trim()) out.push({ speaker: 'Narrator', type: 'narration', text: tail.trim(), emotion: '' });
  return audiobookTurnTaking(out);
}

function audiobookTurnTaking(segs) {
  let a = null, b = null;
  for (const s of segs) {
    if (s.type !== 'dialogue') continue;
    if (s.speaker && !/^Unknown|Unbekannt/i.test(s.speaker)) {
      if (s.speaker !== b) { a = b; b = s.speaker; }
    } else if (a && b && a !== b) {
      s.speaker = a;
      const t = a; a = b; b = t;
    }
  }
  return segs;
}

  root._abImplausibleDialoguePiece = _abImplausibleDialoguePiece;
  root.audiobookSplitByQuotes = audiobookSplitByQuotes;
  root.audiobookTurnTaking = audiobookTurnTaking;
  root.TTVC = root.TTVC || {};
  root.TTVC.audiobook = root.TTVC.audiobook || {};
  root.TTVC.audiobook.segmentation = { splitByQuotes: audiobookSplitByQuotes, turnTaking: audiobookTurnTaking };
})(window);