// ── Book → multi-speaker audiobook ──────────────────────────────────────────
//
// Bridges the Read Aloud reader and the Script Rehearser: an LLM scans the
// document (in the current scope — selection / page range / whole book),
// attributes every segment to a speaker ("Narrator" or a character) with an
// emotion, then hands the result to the Script Rehearser as a cast-able script
// so each character gets its own voice. The rehearser is the editable preview:
// you fix any mis-attribution, cast voices, and synthesise there.
//
// Reuses: /api/attribute-dialogue (LLM), readerState + readerScopeIndices()
// (reader.js), parseScript / detectCharacters / rehState / rehDefaultLlmUrl
// (rehearser.js), splitTextIntoChunks (generation.js), $ / toast (utils.js).

const AUDIOBOOK_CHUNK_CHARS = 3000;   // passage size per LLM attribution call
const _audiobook = { running: false, cancel: false };

// Opening/closing quote glyphs across book conventions: English "..."/“...”,
// German »...«/„...“, French «...», single ‘...’/›...‹, CJK 「...」『...』, em-dash speech.
const AB_DIALOGUE_RE = /[«»„“”"‟‚‘’›‹『「<]|(?:^|\n)\s*[—–]\s/;
function audiobookHasDialogue(t) { return AB_DIALOGUE_RE.test(t || ''); }

// Join words hyphenated across a PDF line break ("Schwer- tes" → "Schwertes")
// so the audiobook reads cleanly and speaker tags aren't split.
function audiobookDehyphenate(t) { return (t || '').replace(/([a-zäöüß])-\s+(?=[a-zäöüßA-ZÄÖÜ])/g, '$1'); }

// Speech-tag heuristic so the book still casts with REAL names when the LLM is down.
const AB_SPEECH_VERBS = '(?:sagte|fragte|rief|antwortete|erwiderte|entgegnete|meinte|flüsterte|wisperte|raunte|murmelte|brummte|knurrte|brüllte|schrie|stammelte|fauchte|zischte|seufzte|lachte|kicherte|befahl|wiederholte|fuhr\\s+fort|said|asked|replied|answered|whispered|murmured|muttered|shouted|cried|called|exclaimed|added|continued)';
const AB_NOTNAME = new Set([
  'Der', 'Die', 'Das', 'Den', 'Dem', 'Ein', 'Eine', 'Einen', 'Er', 'Sie', 'Es', 'Ich', 'Du', 'Wir', 'Ihr', 'Man',
  'Und', 'Aber', 'Da', 'Dann', 'Doch', 'So', 'Nun', 'Jetzt', 'The', 'He', 'She', 'It', 'They', 'A', 'An', 'And', 'But', 'Then', 'Now',
  // common sentence-initial adverbs / interjections / abstractions that are NOT characters
  'Sofort', 'Plötzlich', 'Endlich', 'Schließlich', 'Stille', 'Schweigen', 'Stimme', 'Stimmen', 'Frage', 'Antwort',
  'Gelächter', 'Wieder', 'Gleich', 'Sogleich', 'Langsam', 'Leise', 'Laut', 'Kaum', 'Vielleicht', 'Natürlich', 'Wirklich',
  'Ja', 'Nein', 'Komm', 'Warte', 'Halt', 'Geh', 'Hier', 'Dort', 'Oben', 'Unten', 'Schon', 'Noch', 'Auch', 'Nur', 'Immer', 'Nie']);
const _AB_NAME = "([A-ZÄÖÜ][A-Za-zäöüß'\\-]+)";
function audiobookGuessSpeaker(after, before) {
  let m;
  const ok = n => (n && !AB_NOTNAME.has(n)) ? n : null;
  // NOTE: no 'i' flag — names must be genuinely capitalized; German speech verbs
  // after a quote are lowercase, so this rejects pronouns like "sagte er".
  // after the quote: ", sagte Riskan" / "sagte Riskan" (verb → name)
  if ((m = new RegExp('^[\\s,;–-]*' + AB_SPEECH_VERBS + '\\s+(?:der|die|das|ein|eine)?\\s*' + _AB_NAME).exec(after || ''))) { const r = ok(m[1]); if (r) return r; }
  // after the quote: ", Riskan sagte" (name → verb)
  if ((m = new RegExp('^[\\s,;–-]*' + _AB_NAME + '\\s+' + AB_SPEECH_VERBS).exec(after || ''))) { const r = ok(m[1]); if (r) return r; }
  // before the quote: "Riskan sagte:" / "Riskan fragte"
  if ((m = new RegExp(_AB_NAME + '\\s+' + AB_SPEECH_VERBS + '[\\s:,–-]*$').exec(before || ''))) { const r = ok(m[1]); if (r) return r; }
  return null;
}

// Deterministic fallback: split a passage into narration + dialogue by quotation
// spans and attribute speakers from the surrounding speech tags. Used when the LLM
// is unavailable so dialogue — and as many speakers as possible — are never lost.
const AB_QUOTE_SPAN = /»([^«]+)«|«([^»]+)»|„([^“”]+)[“”]|“([^”]+)”|"([^"]+)"|「([^」]+)」|『([^』]+)』/g;
function audiobookSplitByQuotes(text) {
  const spans = []; let m;
  AB_QUOTE_SPAN.lastIndex = 0;
  while ((m = AB_QUOTE_SPAN.exec(text))) {
    spans.push({ start: m.index, end: AB_QUOTE_SPAN.lastIndex, quote: (m[1] || m[2] || m[3] || m[4] || m[5] || m[6] || m[7] || '').trim() });
  }
  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];
    const 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);
      const speaker = audiobookGuessSpeaker(after, pre) || 'Unknown';
      out.push({ speaker, type: 'dialogue', text: sp.quote, emotion: '' });
    }
    last = sp.end;
  }
  const tail = text.slice(last).trimEnd();
  if (tail) {
    // If the tail starts with an unclosed opening quote (PDF line-break cut it off),
    // treat the quoted portion as dialogue rather than narrator.
    const unclosed = tail.match(/^([\s\S]*?)(»)([\s\S]+)$/);
    if (unclosed && !tail.includes('«')) {
      if (unclosed[1].trim()) out.push({ speaker: 'Narrator', type: 'narration', text: unclosed[1].trim(), emotion: '' });
      const speaker = audiobookGuessSpeaker('', unclosed[1]) || 'Unknown';
      out.push({ speaker, type: 'dialogue', text: unclosed[3].trim(), emotion: '' });
    } else if (tail.trim()) {
      out.push({ speaker: 'Narrator', type: 'narration', text: tail.trim(), emotion: '' });
    }
  }
  return audiobookTurnTaking(out);
}

// Fill 'Unknown' dialogue speakers by two-person alternation — but only once TWO
// distinct named speakers are established nearby (conservative: won't guess in a
// monologue, so it rarely invents a wrong name).
function audiobookTurnTaking(segs) {
  let a = null, b = null;   // two most recent distinct named speakers (b = latest)
  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;                 // the other of the two → alternate
      const t = a; a = b; b = t;     // rotate so the next Unknown alternates back
    }
  }
  return segs;
}

function audiobookLlmUrl()   { return $('reh-llm-url')?.value.trim() || (typeof rehDefaultLlmUrl === 'function' ? rehDefaultLlmUrl() : ''); }
function audiobookLlmModel() { return $('reh-llm-model')?.value || ''; }
function audiobookLang()     { return $('reh-design-lang')?.value || ''; }

// Gather the plain text of the current reader scope (selection > page range > all).
// Also records PDF page boundaries as character offsets in the returned text
// (_audiobook.pageMarks) so saving to the Rehearser can reconstruct page breaks.
function audiobookScopeText() {
  _audiobook.pageMarks = [];
  if (typeof readerScopeIndices !== 'function' || !readerState?.sentences?.length) return '';
  const idxs = readerScopeIndices();
  const anchors = [];                 // {page, anchor} — first sentence of each new page
  let lastPage = null;
  for (const i of idxs) {
    const u = readerState.sentences[i];
    const pg = u?.words?.[0]?.page;
    if (pg != null && pg !== lastPage) {
      anchors.push({ page: pg, anchor: (u.text || '').trim().slice(0, 40) });
      lastPage = pg;
    }
  }
  const raw = idxs.map(i => readerState.sentences[i].text).join(' ').replace(/\s+/g, ' ').trim();
  const text = audiobookDehyphenate(raw);   // mend PDF line-break hyphenation for clean speech + tag matching
  // Locate each page anchor in the final text → page-break offsets.
  let from = 0;
  for (const a of anchors) {
    const probe = audiobookDehyphenate(a.anchor).slice(0, 24);
    if (!probe) continue;
    const pos = text.indexOf(probe, from);
    if (pos >= 0) { _audiobook.pageMarks.push({ offset: pos, page: a.page }); from = pos; }
  }
  return text;
}

// ── Progress overlay ─────────────────────────────────────────────────────────

function audiobookProgress(total) {
  let ov = document.getElementById('audiobook-overlay');
  if (!ov) {
    ov = document.createElement('div');
    ov.id = 'audiobook-overlay';
    ov.className = 'audiobook-overlay';
    ov.innerHTML = `<div class="audiobook-box">
      <div class="audiobook-title"><span class="mdi mdi-drama-masks"></span> Casting audiobook</div>
      <div class="audiobook-msg" id="audiobook-msg">Analysing…</div>
      <div class="reader-synth-track"><div class="reader-synth-fill" id="audiobook-fill"></div></div>
      <div class="audiobook-actions"><button class="btn-secondary btn-sm" id="audiobook-cancel">Cancel</button></div>
    </div>`;
    document.body.appendChild(ov);
    ov.querySelector('#audiobook-cancel').addEventListener('click', () => { _audiobook.cancel = true; });
  }
  ov.hidden = false;
  const fill = ov.querySelector('#audiobook-fill');
  const msg = ov.querySelector('#audiobook-msg');
  return {
    update(done, label) { if (fill) fill.style.width = (done / total * 100) + '%'; if (msg && label) msg.textContent = label; },
    done() { ov.hidden = true; },
  };
}

const _AB_PALETTE = ['#3b82f6', '#10b981', '#8b5cf6', '#f59e0b', '#ef4444', '#ec4899', '#06b6d4', '#84cc16', '#f97316', '#14b8a6', '#6366f1', '#d946ef'];

// Escape a segment's text and underline any known character names. Module-level
// so the review/preview overlay (audiobookShowPreview) can use it too — the cast
// view (audiobookCastView) defines its own roster-coloured version that shadows
// this inside its closure. Names default to the current run's roster.
function highlightText(text, names) {
  if (!text) return '';
  let html = escHtml(text);
  const list = (names || (_audiobook && _audiobook.roster) || [])
    .filter(n => n && n.toLowerCase() !== 'narrator' && !/^Unknown|Unbekannt/i.test(n))
    .sort((a, b) => b.length - a.length);
  list.forEach((name, idx) => {
    if (name.length < 2) return;
    const safe = name.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
    const color = _AB_PALETTE[idx % _AB_PALETTE.length];
    html = html.replace(new RegExp(`\\b(${safe})\\b`, 'gi'),
      m => `<span style="border-bottom: 2px solid ${color}; font-weight: 600;">${m}</span>`);
  });
  return html;
}

// Live casting view: a scrolling feed of attributed lines + a character roster
// that fills up as speakers are discovered. Far clearer than a bare bar.
function audiobookCastView(total, llmUrl, defaultModel, isIdle = false) {
  const panel = document.getElementById('reader-audiobook-panel');
  if (!panel) return;
  
  if (typeof window.navReaderView === 'function') window.navReaderView('cast');
  else if (typeof window.showReaderView === 'function') window.showReaderView('cast');
  else {
    const mainView = document.getElementById('reader-main-view');
    if (mainView) mainView.hidden = true;
    panel.hidden = false;
  }

  panel.className = 'ab-castpanel-inline card';
  panel.style.display = 'flex';
  panel.style.flexDirection = 'column';
  panel.style.minHeight = '500px';

  panel.innerHTML = `
    <div class="ab-castpanel-head" id="ab-cv-head">
      <span class="mdi mdi-drama-masks"></span>
      <span class="ab-castpanel-title">Casting audiobook</span>
      <span class="ab-castpanel-count" id="ab-cv-count">passage 0 / ${total}</span>
      <button class="ab-castpanel-btn" id="ab-cv-settings-toggle" title="Show / hide casting settings" style="width:auto; padding:2px 6px; margin-left:6px;"><span class="mdi mdi-chevron-up" id="ab-cv-settings-chevron"></span></button>
      <span style="flex:1"></span>
      <span id="ab-cv-settings" style="display:flex; align-items:center; gap:4px;">
      <label for="ab-cv-llm-url" style="font-size:12px; font-weight:600; color:var(--subtext); margin-right:4px;">LLM Engine</label>
      <select id="ab-cv-llm-url" style="width:260px; margin-right:4px; padding:2px 6px; font-size:12px; border:1px solid var(--border); border-radius:4px; background:var(--surface); color:var(--text); outline:none; appearance:auto; cursor:pointer;" aria-label="LLM API URL">
        <option value="${escHtml(llmUrl)}">${escHtml(llmUrl || '— Select an endpoint —')}</option>
      </select>
      <button class="ab-castpanel-btn" id="ab-cv-llm-refresh" style="margin-right:4px;" title="Fetch models"><span class="mdi mdi-refresh"></span></button>
      <select id="ab-cv-llm-select" style="width:220px; padding:2px 6px; font-size:12px; border:1px solid var(--border); border-radius:4px; background:var(--surface); color:var(--text); outline:none;" aria-label="LLM Model" title="Change LLM model for character extraction">
        <option value="${escHtml(defaultModel)}">${escHtml(defaultModel || '— fetch models —')}</option>
      </select>
      <span style="margin-right:8px;"></span>
      <button class="ab-castpanel-btn" id="ab-cv-prompt-btn" title="Edit Casting Prompt" style="display:flex; align-items:center; gap:4px; padding:4px 8px; font-weight:600; font-size:12px; width:auto; height:auto; min-height:28px;"><span class="mdi mdi-text-box-edit-outline"></span> Prompt <span class="mdi mdi-chevron-down" id="ab-cv-prompt-chevron"></span></button>
      </span>
    </div>
    <div class="ab-castpanel-prompt" id="ab-cv-prompt-panel" hidden style="padding:10px 12px; background:var(--panel); border-bottom:1px solid var(--border);">
      <textarea id="ab-cv-prompt-text" rows="8" style="width:100%; font-family:monospace; font-size:13px; font-weight:500; padding:10px; line-height:1.5; border:1px solid var(--border); border-radius:6px; background:var(--surface); color:var(--text); resize:vertical;" placeholder="LLM casting instructions..."></textarea>
      <div style="display:flex; justify-content:flex-end; margin-top:8px; gap:8px; align-items:center;">
        <select id="ab-cv-prompt-lib" class="btn-secondary btn-sm" style="max-width:200px; outline:none; border:1px solid var(--border); border-radius:4px; padding:4px 8px; font-size:12px; background:var(--surface);" aria-label="Load a saved prompt">
          <option value="">— Load saved prompt —</option>
        </select>
        <button class="btn-secondary btn-sm" id="ab-cv-prompt-del" title="Delete selected prompt" style="display:none; color:var(--error);"><span class="mdi mdi-delete-outline"></span></button>
        <input type="text" id="ab-cv-prompt-name" style="width:140px; padding:4px 8px; font-size:12px; border:1px solid var(--border); border-radius:4px; background:var(--surface); color:var(--text); outline:none;" placeholder="Preset name...">
        <button class="btn-primary btn-sm" id="ab-cv-prompt-save" title="Save current prompt as a preset"><span class="mdi mdi-content-save"></span> Save preset</button>
      </div>
    </div>
    <div class="reader-synth-track ab-castpanel-bar" style="position:relative; height:18px;">
      <div class="reader-synth-fill" id="ab-cv-fill" style="height:100%;"></div>
      <div id="ab-cv-fill-text" style="position:absolute; inset:0; display:flex; align-items:center; justify-content:center; font-size:11px; font-weight:600; color:var(--text); text-shadow: 0px 1px 2px var(--bg), 0px -1px 2px var(--bg); pointer-events:none;">0%</div>
    </div>
    <div class="ab-cv-body">
      <div class="ab-cv-feed-wrap">
        <div class="ab-cv-feed" id="ab-cv-feed"></div>
        <button class="ab-cv-jump-btn" id="ab-cv-jump-btn" hidden title="Jump to latest"><span class="mdi mdi-chevron-double-down"></span> Live</button>
      </div>
      <div class="ab-cv-side">
        <div class="ab-cv-side-head">Characters found</div>
        <div class="ab-cv-chars" id="ab-cv-chars"><span class="ab-cv-empty">reading…</span></div>
      </div>
    </div>
    </div>
    <div class="ab-castpanel-foot" id="ab-cv-foot" style="border-top:1px solid var(--border); padding:10px 12px; display:flex; justify-content:flex-end; align-items:center;">
      <span class="ab-cv-status" id="ab-cv-status-msg" style="color:var(--subtext); font-size:12px; flex:1; display:none;">Ready to cast.</span>
      <button class="btn-secondary btn-sm" id="ab-cv-cancel" style="color:var(--red); margin-right:8px;"><span class="mdi mdi-close"></span> Cancel</button>
      <button class="btn-secondary btn-sm" id="ab-cv-start-recast-unk" style="display:none; margin-right:8px; color:var(--error);" title="Re-run only Unknown segments"><span class="mdi mdi-account-question-outline"></span> Recast unknown</button>
      <button class="btn-secondary btn-sm" id="ab-cv-start-recast" style="display:none; margin-right:8px;" title="Re-run entire document"><span class="mdi mdi-refresh"></span> Recast all</button>
      <button class="btn-primary btn-sm" id="ab-cv-start-cast" style="display:none;"><span class="mdi mdi-play"></span> Cast now</button>
    </div>`;
    
  const AB_DEFAULT_PROMPT = `Du bist ein erfahrener Drehbuchautor und Hörbuch-Regisseur. Deine Aufgabe ist es, einen Auszug aus einem deutschen Roman zu analysieren und ihn perfekt in einzelne Segmente für Erzähler und Dialoge (wörtliche Rede) zu unterteilen.

WICHTIGE DEFINITION VON DIALOG:
Text ist NUR dann 'dialogue', wenn er explizit in Anführungszeichen steht (z.B. »...«, „...“, "...", «...», <<...>>) oder mit einem Gedankenstrich (—) beginnt. ALLES ANDERE, einschließlich Handlungsbeschreibungen (Inquit-Formeln), inneren Gedanken und Beschreibungen, MUSS als 'narration' (Erzähler) deklariert werden.
Markiere Text NIEMALS als Dialog, nur weil der Name eines Charakters erwähnt wird! (z.B. "Karyla rannte zur Tür." ist Narration, KEIN Dialog).

ANALYSE-REGELN FÜR DIE ZUORDNUNG DES SPRECHERS (Sei deduktiv):
1. Direkte Zuordnung: Achte auf Wörter wie "sagte [Name]", "fragte er", "rief sie". Löse Pronomen (er/sie) zum tatsächlichen Namen auf.
2. Handlungs-Hinweise (Action Beats): Wenn ein Charakter eine Handlung ausführt und direkt davor/danach wörtliche Rede steht, spricht meist dieser Charakter (z.B. "Thomas trat ans Fenster. »Es regnet.«").
3. Das Ping-Pong-Prinzip: Wenn zwei Personen sprechen, wechseln sie sich ab. Verfolge diese Kette lückenlos zurück zur letzten eindeutigen Nennung.
4. Gruppen-Dialoge (3+ Personen): An wen richtet sich die Aussage? Passt die Aussage zum Wissen oder Tonfall eines bestimmten Charakters?
5. Wiederverwendung: Nutze EXAKT die Namen aus der Liste der bekannten Charaktere, FALLS der Name dort aufgeführt ist. Wenn ein neuer Charakter spricht, extrahiere seinen Namen direkt aus dem Text (z.B. 'Karyla', 'Uriens').
6. Unbekannte Sprecher: Nur wenn eine Zuordnung durch Kontext absolut nicht möglich ist, verwende 'Unknown'. Rate nicht blind, aber bevorzuge immer einen namentlich genannten Charakter gegenüber 'Unknown'.

FÜR JEDES SEGMENT GIBST DU FOLGENDES AUS:
- speaker: 'Narrator' für Narration/Erzählertext, oder den EXAKTEN Namen des Charakters für gesprochene Dialoge.
- type: 'narration' oder 'dialogue'
- text: Der EXAKTE, wortwörtliche Text aus dem Auszug. Bei 'dialogue' ENTFERNST du die umschließenden Anführungszeichen.
- emotion: Bei Dialogen 1-2 deutsche Wörter, die den Tonfall beschreiben (z.B. wütend, flüsternd, ängstlich). Bei Narration leer lassen ('').

STRIKTE FORMAT- UND TEXTREGELN:
- Mische NIEMALS Narration und Dialog im selben Segment! Trenne sie strikt. Wenn ein Zitat durch eine Handlungsanweisung unterbrochen wird (»Nein«, sagte sie, »halt.«), erstelle 3 Segmente: dialogue ("Nein"), narration (", sagte sie, "), dialogue ("halt.").
- »Text?« und »Text!« sind vollständige Dialoge — das ?« bzw. !« schließt das Zitat ab, auch wenn es ungewohnt aussieht.
- Wenn ein Auszug mit einem offenen »-Zitat endet (kein schließendes «), behandle den Text ab » bis Textende als 'dialogue'.
- Lasse NIEMALS Wörter aus, fasse nicht zusammen, dupliziere nichts und erfinde keinen Text. Der kombinierte Text all deiner Segmente MUSS den Originaltext exakt und lückenlos Wort für Wort rekonstruieren!`;

  const globalPrompt = (typeof _appSettings !== 'undefined' && _appSettings.audiobook_prompt) ? _appSettings.audiobook_prompt : AB_DEFAULT_PROMPT;
  panel.querySelector('#ab-cv-prompt-text').value = globalPrompt;
  
  const closePanel = () => {
    panel.hidden = true;
    panel.innerHTML = '';
    if (typeof window.setNavCastingBadge === 'function') window.setNavCastingBadge(false);
    if (typeof window.navReaderView === 'function') window.navReaderView('main');
    else if (typeof window.showReaderView === 'function') window.showReaderView('main');
    else {
      const mv = document.getElementById('reader-main-view');
      if (mv) mv.hidden = false;
    }
  };

  panel.querySelector('#ab-cv-cancel').addEventListener('click', () => { 
    if (_audiobook.running) { 
      _audiobook.cancel = true; 
      if (typeof _audiobook.abort === 'function') _audiobook.abort();
    }
    closePanel();
  });
  
  panel.querySelector('#ab-cv-prompt-btn').addEventListener('click', () => {
    const p = panel.querySelector('#ab-cv-prompt-panel');
    p.hidden = !p.hidden;
    const chevron = panel.querySelector('#ab-cv-prompt-chevron');
    if (chevron) {
      chevron.className = p.hidden ? 'mdi mdi-chevron-down' : 'mdi mdi-chevron-up';
    }
  });

  // Collapse the whole settings block (LLM engine + prompt) to free vertical space.
  (function () {
    const tBtn = panel.querySelector('#ab-cv-settings-toggle');
    const sBox = panel.querySelector('#ab-cv-settings');
    const chev = panel.querySelector('#ab-cv-settings-chevron');
    function apply(collapsed) {
      if (sBox) sBox.style.display = collapsed ? 'none' : 'flex';
      if (collapsed) { const p = panel.querySelector('#ab-cv-prompt-panel'); if (p) p.hidden = true; }
      if (chev) chev.className = 'mdi ' + (collapsed ? 'mdi-chevron-down' : 'mdi-chevron-up');
    }
    let collapsed = false;
    try { collapsed = localStorage.getItem('ttsvc_ab_settings_collapsed') === '1'; } catch (_) {}
    apply(collapsed);
    if (tBtn) tBtn.addEventListener('click', () => {
      collapsed = !collapsed;
      try { localStorage.setItem('ttsvc_ab_settings_collapsed', collapsed ? '1' : '0'); } catch (_) {}
      apply(collapsed);
    });
  })();

  // Prompt Library logic
  let savedPrompts = [];
  try { savedPrompts = JSON.parse(localStorage.getItem('ttsvc_ab_prompts') || '[]'); } catch (_) { savedPrompts = []; }
  const libSelect = panel.querySelector('#ab-cv-prompt-lib');
  const delBtn = panel.querySelector('#ab-cv-prompt-del');
  const promptText = panel.querySelector('#ab-cv-prompt-text');

  const renderPromptLib = (selectedIdx = -1) => {
    libSelect.innerHTML = '<option value="">— Load saved prompt —</option>' + 
      savedPrompts.map((p, i) => `<option value="${i}">${escHtml(p.name)}</option>`).join('');
    if (selectedIdx >= 0) {
      libSelect.value = selectedIdx;
      delBtn.style.display = 'block';
    } else {
      libSelect.value = '';
      delBtn.style.display = 'none';
    }
  };
  renderPromptLib();

  libSelect.addEventListener('change', () => {
    const idx = parseInt(libSelect.value);
    const nameInput = panel.querySelector('#ab-cv-prompt-name');
    if (!isNaN(idx) && savedPrompts[idx]) {
      promptText.value = savedPrompts[idx].prompt;
      if (nameInput) nameInput.value = savedPrompts[idx].name;
      delBtn.style.display = 'block';
    } else {
      if (nameInput) nameInput.value = '';
      delBtn.style.display = 'none';
    }
  });

  delBtn.addEventListener('click', () => {
    const idx = parseInt(libSelect.value);
    if (isNaN(idx)) return;
    if (confirm('Delete this saved prompt preset?')) {
      savedPrompts.splice(idx, 1);
      localStorage.setItem('ttsvc_ab_prompts', JSON.stringify(savedPrompts));
      renderPromptLib();
      toast('Prompt deleted', 'success');
    }
  });

  panel.querySelector('#ab-cv-prompt-save').addEventListener('click', async () => {
    const val = promptText.value.trim();
    if (!val) { toast('Prompt is empty', 'error'); return; }
    const nameInput = panel.querySelector('#ab-cv-prompt-name');
    const name = nameInput.value.trim() || 'Custom Prompt ' + (savedPrompts.length + 1);
    
    let targetIdx = parseInt(libSelect.value);
    if (!isNaN(targetIdx) && savedPrompts[targetIdx] && savedPrompts[targetIdx].name === name) {
      savedPrompts[targetIdx].prompt = val;
    } else {
      savedPrompts.push({ name, prompt: val });
      targetIdx = savedPrompts.length - 1;
    }
    
    localStorage.setItem('ttsvc_ab_prompts', JSON.stringify(savedPrompts));
    renderPromptLib(targetIdx);
    toast('Prompt preset saved', 'success');
    
    // Also save as global default for next time
    if (typeof _appSettings !== 'undefined') _appSettings.audiobook_prompt = val;
    try { await fetch('/api/settings', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ audiobook_prompt: val }) }); } catch (e) {}
  });

  // Sync the LLM engine dropdown with global options
  const syncEngineSelect = () => {
    const localSel = panel.querySelector('#ab-cv-llm-url');
    const globalSel = document.getElementById('llm-active-url');
    if (globalSel && localSel) {
      const currentVal = localSel.value;
      localSel.innerHTML = globalSel.innerHTML;
      localSel.value = currentVal || globalSel.value || '';
    }
  };
  syncEngineSelect();

  // Fetch available models and populate the select drop-down
  const loadModels = () => {
    const urlInput = panel.querySelector('#ab-cv-llm-url');
    const sel = panel.querySelector('#ab-cv-llm-select');
    if (!sel || !urlInput) return;
    const currentUrl = urlInput.value.trim();
    const oldVal = sel.value;
    sel.innerHTML = '<option value="">loading...</option>';
    fetch('/api/conversation/llm-models' + (currentUrl ? '?url=' + encodeURIComponent(currentUrl) : ''))
      .then(r => r.json())
      .then(d => {
        if (d.models && d.models.length) {
          sel.innerHTML = d.models.map(m => `<option value="${escHtml(m)}">${escHtml(m)}</option>`).join('');
          if (oldVal && d.models.includes(oldVal)) sel.value = oldVal;
          else if (d.models.includes(defaultModel)) sel.value = defaultModel;
        } else {
          sel.innerHTML = `<option value="${escHtml(defaultModel)}">${escHtml(defaultModel || '— fetch models —')}</option>`;
        }
      }).catch(() => {
        sel.innerHTML = `<option value="${escHtml(defaultModel)}">${escHtml(defaultModel || '— fetch models —')}</option>`;
      });
  };
  loadModels();
  panel.querySelector('#ab-cv-llm-refresh').addEventListener('click', loadModels);
  const urlInput = panel.querySelector('#ab-cv-llm-url');
  if (urlInput) urlInput.addEventListener('change', loadModels);

  const applyPromptAndRun = (callback) => {
    const newPrompt = panel.querySelector('#ab-cv-prompt-text').value;
    const currentUrl = panel.querySelector('#ab-cv-llm-url')?.value.trim();
    const currentModel = panel.querySelector('#ab-cv-llm-select')?.value;
    if (typeof _appSettings !== 'undefined') _appSettings.audiobook_prompt = newPrompt;
    fetch('/api/settings', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ audiobook_prompt: newPrompt }) })
      .finally(() => {
         if (callback) callback(currentUrl, currentModel);
      });
  };

  if (isIdle) {
    const hasSegs = _audiobook.segments && _audiobook.segments.length > 0;
    panel.querySelector('#ab-cv-status-msg').style.display = 'inline-block';
    
    if (hasSegs) {
      const recastUnkBtn = panel.querySelector('#ab-cv-start-recast-unk');
      const recastBtn = panel.querySelector('#ab-cv-start-recast');
      recastUnkBtn.style.display = 'inline-block';
      recastBtn.style.display = 'inline-block';
      recastUnkBtn.addEventListener('click', () => applyPromptAndRun(audiobookRecastUnknown));
      recastBtn.addEventListener('click', () => applyPromptAndRun(audiobookCast));
      panel.querySelector('#ab-cv-status-msg').textContent = 'Ready to recast.';
    } else {
      const castBtn = panel.querySelector('#ab-cv-start-cast');
      castBtn.style.display = 'inline-block';
      castBtn.addEventListener('click', () => applyPromptAndRun(audiobookCast));
    }
  } else {
    panel.querySelector('#ab-cv-cancel').innerHTML = '<span class="mdi mdi-stop"></span> Stop Casting';
  }

  const fill = panel.querySelector('#ab-cv-fill'), count = panel.querySelector('#ab-cv-count');
  const feed = panel.querySelector('#ab-cv-feed'), chars = panel.querySelector('#ab-cv-chars');
  const roster = new Map(); // name -> { count, color }
  const colorFor = name => {
    if (!roster.has(name)) roster.set(name, { count: 0, color: _AB_PALETTE[roster.size % _AB_PALETTE.length] });
    return roster.get(name).color;
  };
  const highlightText = (text) => {
    if (!text) return '';
    let html = escHtml(text);
    const names = [...roster.keys()]
      .filter(n => n.toLowerCase() !== 'narrator' && !/^Unknown|Unbekannt/i.test(n))
      .sort((a, b) => b.length - a.length);
    for (const name of names) {
      if (name.length < 2) continue;
      const safeName = name.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
      const regex = new RegExp(`\\b(${safeName})\\b`, 'gi');
      html = html.replace(regex, (match) => {
        return `<span style="border-bottom: 2px solid ${colorFor(name)}; font-weight: 600;">${match}</span>`;
      });
    }
    return html;
  };
  const renderRoster = () => {
    const items = [...roster.entries()].filter(([, info]) => info.count > 0).sort((a, b) => b[1].count - a[1].count);
    chars.innerHTML = items.length
      ? items.map(([n, info]) => `<span class="ab-chip" style="--c:${info.color}"><span class="ab-chip-dot"></span>${escHtml(n)}<b>${info.count}</b></span>`).join('')
      : '<span class="ab-cv-empty">reading…</span>';
  };
  const MAXROWS = 600;  // keep most of the book visible; only trim when user is at bottom
  // Whether the user has scrolled up to review/edit earlier content.
  // While true: auto-scroll and trim are suppressed so their position is preserved.
  let _userScrolled = false;
  const jumpBtn = panel.querySelector('#ab-cv-jump-btn');
  feed.addEventListener('scroll', () => {
    const atBottom = feed.scrollTop + feed.clientHeight >= feed.scrollHeight - 80;
    _userScrolled = !atBottom;
    if (jumpBtn) jumpBtn.hidden = atBottom;
  }, { passive: true });
  const _scrollToBottom = () => { feed.scrollTop = feed.scrollHeight; };
  if (jumpBtn) {
    jumpBtn.addEventListener('click', () => {
      _userScrolled = false;
      jumpBtn.hidden = true;
      _scrollToBottom();
    });
  }
  const trim = () => {
    if (_userScrolled) return;  // don't touch the feed while user is reading/editing
    while (feed.childElementCount > MAXROWS) feed.removeChild(feed.firstChild);
    _scrollToBottom();
  };

  // Manual character assignment logic
  let assignModeSeg = null;
  let assignModeRow = null;

  let assignPopup = document.getElementById('ab-cv-assign-popup');
  if (!assignPopup) {
    assignPopup = document.createElement('div');
    assignPopup.id = 'ab-cv-assign-popup';
    assignPopup.style.cssText = 'position:fixed; z-index:2001; display:none; background:var(--surface); border:1px solid var(--border); border-radius:8px; box-shadow:0 10px 25px rgba(0,0,0,0.4); padding:10px; width:220px; max-height:320px; flex-direction:column; gap:8px;';
    
    const header = document.createElement('div');
    header.style.cssText = 'display:flex; justify-content:space-between; align-items:center; margin-bottom:-4px; margin-top:-4px;';
    header.innerHTML = '<span style="font-size:11px; font-weight:600; color:var(--subtext); text-transform:uppercase;">Assign to</span><span class="mdi mdi-close" style="cursor:pointer; font-size:16px; color:var(--subtext); padding:4px;" title="Close (Esc)"></span>';
    assignPopup.appendChild(header);

    const inp = document.createElement('input');
    inp.type = 'text'; inp.placeholder = 'Search or add character...';
    inp.style.cssText = 'width:100%; padding:6px; font-size:13px; border:1px solid var(--border); border-radius:4px; background:var(--bg); color:var(--text);';
    assignPopup.appendChild(inp);
    const list = document.createElement('div');
    list.className = 'ab-cv-popup-list';
    list.style.cssText = 'display:flex; flex-direction:column; gap:2px; overflow-y:auto; max-height:220px; margin-right:-4px; padding-right:4px;';
    assignPopup.appendChild(list);
    document.body.appendChild(assignPopup);
    
    header.querySelector('.mdi-close').addEventListener('click', closeAssignPopup);
    
    document.addEventListener('mousedown', e => {
      if (assignPopup.style.display !== 'none' && !assignPopup.contains(e.target) && !e.target.closest('.ab-cv-spk')) {
        closeAssignPopup();
      }
    });
    document.addEventListener('keydown', e => {
      if (e.key === 'Escape' && assignPopup.style.display !== 'none') {
        closeAssignPopup();
      }
    });
    inp.addEventListener('keydown', e => {
      if (e.key === 'Enter') {
        const addBtn = assignPopup.querySelector('.ab-cv-popup-add-btn');
        const visibleBtns = Array.from(assignPopup.querySelectorAll('.ab-cv-popup-list > div[data-name]')).filter(b => b.style.display !== 'none');
        if (addBtn && addBtn.style.display !== 'none') {
           addBtn.click();
        } else if (visibleBtns.length === 1) {
           visibleBtns[0].click();
        } else {
           const val = inp.value.trim();
           if (val) assignName(val);
        }
      } else if (e.key === 'Escape') {
        closeAssignPopup();
      }
    });
    inp.addEventListener('input', () => {
      const val = inp.value.trim().toLowerCase();
      const listItems = assignPopup.querySelectorAll('.ab-cv-popup-list > div[data-name]');
      let exactMatch = false;
      listItems.forEach(item => {
        const name = item.dataset.name.toLowerCase();
        if (name === val) exactMatch = true;
        if (name.includes(val)) item.style.display = 'flex';
        else item.style.display = 'none';
      });
      let addBtn = assignPopup.querySelector('.ab-cv-popup-add-btn');
      if (val && !exactMatch && val !== 'narrator') {
        if (!addBtn) {
          addBtn = document.createElement('div');
          addBtn.className = 'ab-cv-popup-add-btn';
          addBtn.style.cssText = 'padding:6px 8px; font-size:12px; cursor:pointer; border-radius:4px; display:flex; align-items:center; gap:6px; transition:background 0.1s; font-weight:600; color:var(--primary); border-top:1px solid var(--border); margin-top:4px; padding-top:8px;';
          addBtn.onmouseover = () => addBtn.style.background = 'var(--panel)';
          addBtn.onmouseout = () => addBtn.style.background = 'transparent';
        }
        addBtn.innerHTML = `<span style="font-size:14px; font-weight:bold;">+</span> Add "${escHtml(inp.value.trim())}"`;
        addBtn.onclick = () => assignName(inp.value.trim());
        addBtn.style.display = 'flex';
        assignPopup.querySelector('.ab-cv-popup-list').appendChild(addBtn); // keep at bottom
      } else if (addBtn) {
        addBtn.style.display = 'none';
      }
    });
  }

  function closeAssignPopup() {
    assignPopup.style.display = 'none';
    if (assignModeRow) assignModeRow.classList.remove('is-assigning');
    assignModeSeg = null;
    assignModeRow = null;
  }

  function assignName(name) {
    if (!assignModeSeg) return;
    const isNarrator = name.toLowerCase() === 'narrator';
    // Decrement old speaker's count before reassigning
    const _oldSpk = assignModeSeg.speaker;
    if (_oldSpk && roster.has(_oldSpk)) {
      const _old = roster.get(_oldSpk);
      if (_old.count > 0) _old.count--;
    }
    assignModeSeg.speaker = isNarrator ? 'Narrator' : name;
    assignModeSeg.type = isNarrator ? 'narration' : 'dialogue';
    if (isNarrator) assignModeSeg.emotion = '';
    assignModeRow.classList.remove('is-assigning');
    
    const speakerName = isNarrator ? 'Narrator' : name;
    const c = colorFor(speakerName);
    if (!roster.has(speakerName)) roster.set(speakerName, { count: 0, color: c });
    roster.get(speakerName).count++;
    
    assignModeRow.className = 'ab-cv-row' + (isNarrator ? ' is-narr' : '');
    assignModeRow.querySelector('.ab-cv-spk').innerHTML = `${escHtml(speakerName)}${assignModeSeg.emotion ? ' <span style="text-transform:lowercase; font-weight:normal; opacity:0.8">(' + escHtml(assignModeSeg.emotion) + ')</span>' : ''}`;
    assignModeRow.querySelector('.ab-cv-spk').style.color = c;
    assignModeRow.querySelector('.ab-cv-spk').title = 'Click to assign character';
    renderRoster();
    toast(`Assigned to ${isNarrator ? 'Narrator' : name}`, 'success');
    closeAssignPopup();
  }

  feed.addEventListener('click', e => {
    const spk = e.target.closest('.ab-cv-spk');
    if (spk) {
      const row = spk.closest('.ab-cv-row');
      if (row && row.__seg && !row.classList.contains('is-processing')) {
        if (assignModeRow) assignModeRow.classList.remove('is-assigning');
        assignModeSeg = row.__seg;
        assignModeRow = row;
        row.classList.add('is-assigning');
        window.getSelection().removeAllRanges();
        
        assignPopup.style.display = 'flex';
        const rect = spk.getBoundingClientRect();
        // ensure popup doesn't go off bottom of screen
        const top = Math.min(rect.bottom + 4, window.innerHeight - 300);
        assignPopup.style.top = top + 'px';
        assignPopup.style.left = rect.left + 'px';
        
        const list = assignPopup.querySelector('.ab-cv-popup-list');
        list.innerHTML = '';
        
        // Always show Narrator as the first option
        const narrBtn = document.createElement('div');
        narrBtn.dataset.name = 'Narrator';
        narrBtn.style.cssText = 'padding:6px 8px; font-size:12px; cursor:pointer; border-radius:4px; display:flex; align-items:center; gap:6px; transition:background 0.1s; font-weight:600; color:var(--subtext); border-bottom:1px solid var(--border); margin-bottom:4px; padding-bottom:8px;';
        narrBtn.innerHTML = `<span style="font-size:13px;">📖</span> Narrator`;
        narrBtn.onmouseover = () => narrBtn.style.background = 'var(--panel)';
        narrBtn.onmouseout = () => narrBtn.style.background = 'transparent';
        narrBtn.onclick = () => assignName('Narrator');
        list.appendChild(narrBtn);
        
        const items = [...roster.entries()].sort((a, b) => b[1].count - a[1].count);
        for (const [n, info] of items) {
          const btn = document.createElement('div');
          btn.dataset.name = n;
          btn.style.cssText = 'padding:6px 8px; font-size:12px; cursor:pointer; border-radius:4px; display:flex; align-items:center; gap:6px; transition:background 0.1s; font-weight:600; color:var(--text);';
          btn.innerHTML = `<span style="width:8px;height:8px;border-radius:50%;background:${info.color};"></span> ${escHtml(n)}`;
          btn.onmouseover = () => btn.style.background = 'var(--panel)';
          btn.onmouseout = () => btn.style.background = 'transparent';
          btn.onclick = () => assignName(n);
          list.appendChild(btn);
        }
        
        const inp = assignPopup.querySelector('input');
        inp.value = '';
        setTimeout(() => inp.focus(), 50);
      }
    }
  });

  let splitBtn = document.getElementById('ab-cv-split-btn');
  if (!splitBtn) {
    splitBtn = document.createElement('button');
    splitBtn.id = 'ab-cv-split-btn';
    splitBtn.className = 'btn-secondary btn-sm';
    splitBtn.innerHTML = '<span class="mdi mdi-call-split"></span> Split text to Unknown Speaker';
    splitBtn.style.cssText = 'position:fixed; z-index:2000; display:none; background:var(--accent); color:#fff; border:none; box-shadow:0 4px 12px rgba(0,0,0,0.3);';
    document.body.appendChild(splitBtn);
  }
  let currentSplitState = null;

  document.addEventListener('selectionchange', () => {
    if (!feed) return; // Panel closed
    const sel = window.getSelection();
    if (sel.isCollapsed || !feed.contains(sel.anchorNode)) {
      if (splitBtn) splitBtn.style.display = 'none';
      currentSplitState = null;
      return;
    }
    const txtSpan = sel.anchorNode.nodeType === 3 ? sel.anchorNode.parentNode.closest('.ab-cv-txt') : sel.anchorNode.closest('.ab-cv-txt');
    if (!txtSpan) { splitBtn.style.display = 'none'; return; }
    
    const row = txtSpan.closest('.ab-cv-row');
    if (!row || !row.__seg) return;
    
    const text = sel.toString().trim();
    if (text.length > 0) {
      // If we are in assign mode and they selected a short text, it's for assigning a name. Don't show split.
      if (assignModeSeg && text.length < 40 && !text.includes('\n')) {
        splitBtn.style.display = 'none';
        return;
      }
      
      const rect = sel.getRangeAt(0).getBoundingClientRect();
      splitBtn.style.display = 'block';
      splitBtn.style.top = (rect.bottom + 8) + 'px';
      splitBtn.style.left = Math.max(10, rect.left + (rect.width / 2) - 100) + 'px';
      currentSplitState = { row, text, seg: row.__seg };
    } else {
      splitBtn.style.display = 'none';
      currentSplitState = null;
    }
  });

  splitBtn.addEventListener('click', () => {
    if (!currentSplitState) return;
    const { row, text, seg } = currentSplitState;
    const fullText = seg.text || '';
    const idx = fullText.indexOf(text);
    if (idx === -1) return;
    
    const before = fullText.substring(0, idx).trim();
    const after = fullText.substring(idx + text.length).trim();
    
    // Try committed segments first, then live array (during active casting)
    let arr = _audiobook.segments || [];
    let globalIdx = arr.indexOf(seg);
    if (globalIdx === -1 && Array.isArray(_audiobook.liveSegments)) {
      arr = _audiobook.liveSegments;
      globalIdx = arr.indexOf(seg);
    }
    const newSegs = [];
    if (before) newSegs.push({ speaker: seg.speaker, type: seg.type, emotion: seg.emotion, text: before });
    newSegs.push({ speaker: 'Unknown', type: 'dialogue', emotion: '', text: text });
    if (after) newSegs.push({ speaker: seg.speaker, type: seg.type, emotion: seg.emotion, text: after });

    if (globalIdx !== -1) {
      arr.splice(globalIdx, 1, ...newSegs);
    } else {
      // DOM-only split — will be reconciled once casting finishes
      console.warn('[audiobook] split during casting: DOM-only, segment not yet in array');
    }
    
    const frag = document.createDocumentFragment();
    for (const s of newSegs) {
      const isNarrator = s.type !== 'dialogue' || !s.speaker || s.speaker.toLowerCase() === 'narrator';
      const speakerName = isNarrator ? 'Narrator' : s.speaker;
      const c = colorFor(speakerName);
      const newRow = document.createElement('div');
      newRow.className = 'ab-cv-row' + (isNarrator ? ' is-narr' : '');
      newRow.__seg = s;
      newRow.innerHTML = `<span class="ab-cv-spk" style="color:${c}" title="Click to assign character">${escHtml(speakerName)}${s.emotion ? ' <span style="text-transform:lowercase; font-weight:normal; opacity:0.8">(' + escHtml(s.emotion) + ')</span>' : ''}</span><span class="ab-cv-txt">${highlightText(s.text || '')}</span>`;
      frag.appendChild(newRow);
    }
    row.parentNode.insertBefore(frag, row);
    row.remove();
    
    splitBtn.style.display = 'none';
    window.getSelection().removeAllRanges();
    toast('Segment split! You can now assign a character to the Unknown block.', 'success');
  });

  feed.addEventListener('mouseup', () => {
    if (!assignModeSeg) return;
    const sel = window.getSelection();
    if (!sel.isCollapsed && feed.contains(sel.anchorNode)) {
      const text = sel.toString().trim();
      if (text && text.length < 40 && !text.includes('\n')) {
        assignName(text);
        sel.removeAllRanges();
      }
    }
  });

  chars.addEventListener('click', e => {
    const chip = e.target.closest('.ab-chip');
    if (chip) {
      let name = '';
      for (const n of chip.childNodes) if (n.nodeType === 3) name += n.nodeValue;
      name = name.trim();
      
      if (assignModeSeg) {
        if (name) assignName(name);
      } else if (name) {
        // Scroll to the next occurrence of this character in the feed
        const rows = Array.from(feed.querySelectorAll('.ab-cv-row')).filter(r => r.__seg && r.__seg.speaker === name);
        if (!rows.length) return;
        
        const currentY = feed.scrollTop;
        let target = rows.find(r => (r.offsetTop - feed.offsetTop) > currentY + 10);
        if (!target) target = rows[0]; // loop around to the top
        
        target.scrollIntoView({ behavior: 'smooth', block: 'center' });
        
        // Highlight briefly
        target.style.transition = 'background 0.3s';
        target.style.background = 'var(--accent-hover, rgba(100, 150, 255, 0.2))';
        setTimeout(() => {
          if (target.parentNode) target.style.background = '';
        }, 1000);
      }
    }
  });

  return {
    update(done) { 
      const pct = Math.round((done / total) * 100);
      if (fill) fill.style.width = pct + '%'; 
      if (count) count.textContent = `passage ${done} / ${total}`; 
      const fillText = panel.querySelector('#ab-cv-fill-text');
      if (fillText) fillText.textContent = `${pct}% (Passage ${done} of ${total})`;
    },
    processing(text) {
      if (this._procRow) this._procRow.remove();
      this._procRow = document.createElement('div');
      this._procRow.className = 'ab-cv-row is-processing ab-cv-llm-row';
      const isLong = text.length > 160;
      const preview = escHtml(text.slice(0, 160)) + (isLong ? '…' : '');
      this._procRow.innerHTML = `
        <div class="ab-cv-llm-head">
          <span class="ab-cv-spk" style="color:var(--blue)"><span class="mdi mdi-loading mdi-spin"></span> LLM Reading…</span>
          ${isLong ? '<button class="ab-cv-expand-btn" title="Show full passage"><span class="mdi mdi-chevron-down"></span></button>' : ''}
        </div>
        <div class="ab-cv-llm-preview">${preview}</div>
        ${isLong ? `<div class="ab-cv-llm-full" hidden><pre class="ab-cv-llm-pre">${escHtml(text)}</pre></div>` : ''}
      `;
      if (isLong) {
        this._procRow.querySelector('.ab-cv-expand-btn').addEventListener('click', function () {
          const full = this.closest('.ab-cv-llm-row').querySelector('.ab-cv-llm-full');
          full.hidden = !full.hidden;
          const icon = this.querySelector('span');
          if (icon) icon.className = full.hidden ? 'mdi mdi-chevron-down' : 'mdi mdi-chevron-up';
        });
      }
      feed.appendChild(this._procRow);
      trim();
    },
    clearProcessing() {
      if (this._procRow) { this._procRow.remove(); this._procRow = null; }
    },
    addSegments(segs) {
      this.clearProcessing();
      const frag = document.createDocumentFragment();
      for (const s of segs) {
        const isNarrator = s.type !== 'dialogue' || !s.speaker || s.speaker.toLowerCase() === 'narrator';
        const speakerName = isNarrator ? 'Narrator' : s.speaker;
        const c = colorFor(speakerName);
        roster.get(speakerName).count++;
        const row = document.createElement('div');
        row.className = 'ab-cv-row' + (isNarrator ? ' is-narr' : '');
        row.__seg = s;
        row.innerHTML = `<span class="ab-cv-spk" style="color:${c}" title="Click to assign character">${escHtml(speakerName)}${s.emotion ? ' <span style="text-transform:lowercase; font-weight:normal; opacity:0.8">(' + escHtml(s.emotion) + ')</span>' : ''}</span><span class="ab-cv-txt">${highlightText(s.text || '')}</span>`;
        frag.appendChild(row);
      }
      feed.appendChild(frag); trim(); renderRoster();
    },
    note(text) { const r = document.createElement('div'); r.className = 'ab-cv-note'; r.textContent = text; feed.appendChild(r); trim(); },
    // Visual gap marking that the passages before/after are not contiguous.
    // prevIdx / nextIdx are indices into _audiobook.segments for the gap boundaries.
    // Click expands the divider to show all segments in the gap inline.
    divider(prevIdx, nextIdx) {
      this.clearProcessing();
      const r = document.createElement('div');
      r.className = 'ab-cv-divider ab-cv-divider-expand';
      const gapFrom = Math.max(0, (prevIdx >= 0 ? prevIdx + 1 : 0));
      const segsAll = _audiobook.segments || [];
      const gapTo = Math.min(segsAll.length - 1, (nextIdx >= 0 ? nextIdx - 1 : segsAll.length - 1));
      const gapCount = Math.max(0, gapTo - gapFrom + 1);
      r.innerHTML = `⋯ <span class="ab-cv-divider-hint">${gapCount > 0 ? gapCount + ' line' + (gapCount !== 1 ? 's' : '') + ' hidden — ' : ''}click to expand</span>`;
      r.title = 'Click to reveal the text between these passages';
      r.addEventListener('click', () => {
        const gap = segsAll.slice(gapFrom, gapTo + 1);
        if (!gap.length) { r.remove(); return; }
        const frag = document.createDocumentFragment();
        for (const s of gap) {
          const isNarr = s.type !== 'dialogue' || !s.speaker || s.speaker.toLowerCase() === 'narrator';
          const spk = isNarr ? 'Narrator' : s.speaker;
          const c = colorFor(spk);
          const row = document.createElement('div');
          row.className = 'ab-cv-row ab-cv-ctx-row' + (isNarr ? ' is-narr' : '');
          row.__seg = s;
          row.innerHTML = `<span class="ab-cv-spk" style="color:${c}" title="Click to assign character">${escHtml(spk)}${s.emotion ? ' <span style="text-transform:lowercase;font-weight:normal;opacity:.8">(${escHtml(s.emotion)})</span>' : ''}</span><span class="ab-cv-txt">${highlightText(s.text || '')}</span>`;
          frag.appendChild(row);
        }
        r.replaceWith(frag);
      });
      feed.appendChild(r); trim();
    },
    // Page-break marker in the casting feed (from source PDF page boundaries).
    pagemark(pageNum) {
      const r = document.createElement('div');
      r.className = 'ab-cv-pagemark';
      r.innerHTML = `<span class="mdi mdi-book-open-page-variant"></span> Page ${pageNum}`;
      feed.appendChild(r); trim();
    },
    // Park the panel in a "done" state with a Review button instead of auto-popping
    // the preview — so it waits for you if you wandered off to do something else.
    complete(summary, onOpen, onRecast, onRecastUnknown) {
      if (count) count.textContent = 'done';
      if (fill) fill.style.width = '100%';
      if (typeof allSegments !== 'undefined' && allSegments.length) {
        feed.innerHTML = '';
        const frag = document.createDocumentFragment();
        for (const s of allSegments) {
          const isNarrator = s.type !== 'dialogue' || !s.speaker || s.speaker.toLowerCase() === 'narrator';
          const speakerName = isNarrator ? 'Narrator' : s.speaker;
          const c = colorFor(speakerName);
          const row = document.createElement('div');
          row.className = 'ab-cv-row' + (isNarrator ? ' is-narr' : '');
          row.__seg = s;
          row.innerHTML = `<span class="ab-cv-spk" style="color:${c}" title="Click to assign character">${escHtml(speakerName)}${s.emotion ? ' <span style="text-transform:lowercase; font-weight:normal; opacity:0.8">(' + escHtml(s.emotion) + ')</span>' : ''}</span><span class="ab-cv-txt">${highlightText(s.text || '')}</span>`;
          frag.appendChild(row);
        }
        feed.appendChild(frag);
      }
      const fillText = panel.querySelector('#ab-cv-fill-text');
      if (fillText) fillText.textContent = '100% - Ready for review';
      const cancelBtn = panel.querySelector('#ab-cv-cancel');
      if (cancelBtn) cancelBtn.hidden = true;
      const foot = panel.querySelector('#ab-cv-foot');
      foot.hidden = false;
      foot.innerHTML = `<span class="ab-cv-done"><span class="mdi mdi-check-circle-outline"></span> ${escHtml(summary)}</span><span style="flex:1"></span><button class="btn-secondary btn-sm" id="ab-cv-save-script" style="margin-right:8px;" title="Save to Script Rehearsals without leaving this page"><span class="mdi mdi-content-save-outline"></span> Save script</button><button class="btn-secondary btn-sm" id="ab-cv-recast-unk" style="margin-right:8px; color:var(--error);" title="Re-run only the Unknown segments with the current prompt"><span class="mdi mdi-account-question-outline"></span> Recast unknown</button><button class="btn-secondary btn-sm" id="ab-cv-recast" style="margin-right:8px;" title="Re-run the entire document to apply new settings or prompt tweaks"><span class="mdi mdi-refresh"></span> Recast all</button><button class="btn-primary btn-sm" id="ab-cv-review"><span class="mdi mdi-account-music-outline"></span> Review &amp; cast</button><button class="btn-secondary btn-sm" id="ab-cv-verify" style="margin-left:8px; border-color:var(--accent); color:var(--accent); font-weight:600;" title="2nd Quality increase run — re-checks every speaker assignment against context and resolves all Unknowns"><span class="mdi mdi-shield-check-outline"></span> 2nd Quality Run — Verify</button>`;

      const runVerificationPass = () => {
        const verificationPrompt = `Du bist ein Qualitätsprüfer für die Analyse eines deutschen Hörbuchs. Eine erste KI hat den Textauszug bereits in Segmente unterteilt und jedem Segment einen Sprecher zugewiesen. Deine Aufgabe ist es JEDEN Sprecher-Zuweisung kritisch zu überprüfen und zu korrigieren.

AUFGABE (2. Qualitätslauf — Verifizierung):
1. ÜBERPRÜFE jede Sprecher-Zuweisung: Ist der angegebene Sprecher wirklich derjenige, der spricht? Nutze den Kontext (Inquit-Formeln wie "sagte X", "fragte sie", "rief er", Handlungsbeschreibungen, das Ping-Pong-Prinzip zwischen Sprechern, und den Gesamtkontext der Szene).
2. KORRIGIERE falsch zugewiesene Sprecher mit dem korrekten Namen direkt aus dem Text.
3. LÖSE alle 'Unknown'-Segmente auf: Nutze umgebenden Kontext, die Reihenfolge der Sprecher und textliche Hinweise. 'Unknown' ist NUR dann erlaubt, wenn der Sprecher absolut nicht bestimmbar ist.
4. BEHALTE alle korrekten Zuweisungen exakt unverändert bei.

DEFINITION VON DIALOG (KRITISCH):
Text ist NUR 'dialogue', wenn er in Anführungszeichen steht (»...«, „...", "...", «...», <<...>>) oder mit einem Gedankenstrich (—) beginnt. ALLES ANDERE ist 'narration' (speaker: 'Narrator').

FÜR JEDES SEGMENT AUSGABE:
- speaker: 'Narrator' für Narration, oder EXAKT der Name des Charakters.
- type: 'narration' oder 'dialogue'
- text: EXAKT der WORTWÖRTLICHE Originaltext — KEINE Änderungen, KEINE Auslassungen, KEINE Ergänzungen.
- emotion: Bei Dialogen 1-2 deutsche Wörter für den Tonfall. Bei Narration leer ('').

ABSOLUTE REGELN:
- Alle Segmente zusammen MÜSSEN den Originaltext exakt, lückenlos und wortgetreu rekonstruieren.
- Erfinde NIEMALS Text. Lasse NIEMALS Wörter weg. Füge NIEMALS etwas hinzu.
- Mische NIEMALS Narration und Dialog in einem Segment.`;
        panel.querySelector('#ab-cv-prompt-text').value = verificationPrompt;
        foot.querySelector('#ab-cv-recast-unk').click();
      };
      
      foot.querySelector('#ab-cv-review').addEventListener('click', () => { closePanel(); onOpen(); });
      foot.querySelector('#ab-cv-save-script').addEventListener('click', audiobookSaveAsRehearsal);
      foot.querySelector('#ab-cv-verify').addEventListener('click', runVerificationPass);
      
      const applyPromptAndRun = (callback) => {
        const newPrompt = panel.querySelector('#ab-cv-prompt-text').value;
        const currentUrl = panel.querySelector('#ab-cv-llm-url')?.value.trim();
        const currentModel = panel.querySelector('#ab-cv-llm-select')?.value;
        
        if (typeof _appSettings !== 'undefined') _appSettings.audiobook_prompt = newPrompt;
        fetch('/api/settings', { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ audiobook_prompt: newPrompt }) })
          .finally(() => {
             closePanel();
             if (callback) callback(currentUrl, currentModel);
          });
      };
      
      foot.querySelector('#ab-cv-recast').addEventListener('click', () => applyPromptAndRun(audiobookCast));
      foot.querySelector('#ab-cv-recast-unk').addEventListener('click', () => applyPromptAndRun(audiobookRecastUnknown));
      panel.classList.add('ab-castpanel-done');
      if (typeof window.setNavCastingBadge === 'function') window.setNavCastingBadge(false);
    },
    done() { closePanel(); },
  };
}

async function audiobookRecastUnknown(overrideUrl, overrideModel) {
  if (_audiobook.running) return;
  const segs = _audiobook.segments;
  if (!segs || !segs.length) return;

  const unknownIdxs = [];
  for (let i = 0; i < segs.length; i++) {
    if (segs[i].type === 'dialogue' && (!segs[i].speaker || /^Unknown|Unbekannt/i.test(segs[i].speaker))) {
      unknownIdxs.push(i);
    }
  }
  if (!unknownIdxs.length) { 
    toast('No Unknown speakers found', 'success'); 
    audiobookShowPreview();
    return; 
  }

  _audiobook.running = true; _audiobook.cancel = false;
  if (typeof window.setNavCastingBadge === 'function') window.setNavCastingBadge(true);
  const ac = new AbortController(); _audiobook.abort = () => ac.abort();

  if (overrideUrl && typeof overrideUrl !== 'string') overrideUrl = null;
  const llm_url = overrideUrl || audiobookLlmUrl(), language = audiobookLang();
  let model = overrideModel || audiobookLlmModel();

  const view = audiobookCastView(unknownIdxs.length, llm_url, model);
  
  view.processing('Waking up LLM model (this may take a few minutes if cold-booting)…');
  try {
    await fetch('/api/attribute-dialogue', {
      method: 'POST', headers: { 'Content-Type': 'application/json' }, signal: ac.signal,
      body: JSON.stringify({
        text: 'Wake up.', known_characters: [], recent: '', language,
        llm_url: document.getElementById('ab-cv-llm-url')?.value.trim() || llm_url,
        model: document.getElementById('ab-cv-llm-select')?.value || model
      })
    });
  } catch (err) {
    if (err.name === 'AbortError') { _audiobook.running = false; view.done(); return; }
  }

  let done = 0;
  let prevIdx = -2;
  try {
    for (let i of unknownIdxs) {
      if (_audiobook.cancel) break;
      const targetSeg = segs[i];

      // These Unknown lines come from scattered places in the document. Mark a
      // gap with "⋯" whenever this passage isn't directly after the previous one.
      if (i !== prevIdx + 1) view.divider(prevIdx, i);
      prevIdx = i;

      const start = Math.max(0, i - 12);
      const end = Math.min(segs.length, i + 6);
      const contextSegs = segs.slice(start, end);
      
      const passageText = contextSegs.map(s => {
        if (s.type === 'narration') return s.text;
        return `"${s.text}"`;
      }).join(' ');

      view.update(done++, `Attributing line ${done} / ${unknownIdxs.length}…`);
      view.processing(passageText.trim());
      
      let data = null;
      try {
        const r = await fetch('/api/attribute-dialogue', {
          method: 'POST', headers: { 'Content-Type': 'application/json' },
          signal: ac.signal,
          body: JSON.stringify({
            text: passageText.trim(),
            known_characters: _audiobook.roster.slice(-40),
            recent: '',
            language,
            llm_url: document.getElementById('ab-cv-llm-url')?.value.trim() || llm_url,
            model: document.getElementById('ab-cv-llm-select')?.value || model
          })
        });
        if (!r.ok) { const e = await r.json().catch(() => ({})); throw new Error(e.detail || e.error || r.statusText); }
        data = await r.json();
      } catch (err) {
        if (err.name === 'AbortError') break;
        view.note(`API Error: ${err.message}`);
        continue;
      }
      if (data && data.segments) {
        const match = data.segments.find(s => s.type === 'dialogue' && targetSeg.text.includes(s.text.slice(0, 15)));
        if (match && match.speaker && !/^Unknown|Unbekannt/i.test(match.speaker)) {
           targetSeg.speaker = match.speaker;
           if (match.emotion) targetSeg.emotion = match.emotion;
           if (!_audiobook.roster.includes(match.speaker)) _audiobook.roster.push(match.speaker);
        }
      }
      
      view.addSegments([targetSeg]);
    }
    view.update(unknownIdxs.length);
  } catch (e) {
    if (e.name !== 'AbortError') view.note('Error recasting unknown: ' + e.message);
  } finally {
    _audiobook.running = false;
  }
  
  if (_audiobook.cancel) { view.done(); toast('Recast cancelled', 'error'); return; }
  
  const speakers = new Set(segs.filter(s => s.type === 'dialogue' && s.speaker).map(s => s.speaker));
  const summary = `${speakers.size} character${speakers.size !== 1 ? 's' : ''} · ${segs.length} segments`;
  view.complete(summary, audiobookShowPreview, audiobookCast, audiobookRecastUnknown);
}

function audiobookOpenCastView() {
  if (_audiobook.running) return;
  const text = audiobookScopeText();
  if (!text) { toast('Import a document first', 'error'); return; }

  const llm_url = audiobookLlmUrl();
  const model = audiobookLlmModel();
  
  const chunks = (typeof splitTextIntoChunks === 'function')
    ? splitTextIntoChunks(text, AUDIOBOOK_CHUNK_CHARS)
    : [text];

  // If the user navigates away and back, restore the view instead of clearing their work
  if (_audiobook.segments && _audiobook.segments.length > 0 && _audiobook.lastText === text) {
    const view = audiobookCastView(chunks.length, llm_url, model, false);
    // we need to set the roster manually so color generation matches
    view.addSegments(_audiobook.segments);
    const speakers = new Set(_audiobook.segments.filter(s => s.type === 'dialogue' && s.speaker).map(s => s.speaker));
    const summary = `${speakers.size} character${speakers.size !== 1 ? 's' : ''} · ${_audiobook.segments.length} segments`;
    view.complete(summary, audiobookShowPreview, audiobookCast, audiobookRecastUnknown);
    view.update(chunks.length);
    return;
  }
    
  audiobookCastView(chunks.length, llm_url, model, true);
}

async function audiobookCast(overrideUrl, overrideModel) {
  if (_audiobook.running) return;
  const text = audiobookScopeText();
  if (!text) { toast('Import a document first', 'error'); return; }
  if (typeof parseScript !== 'function') { toast('Rehearser not loaded yet — try again in a moment', 'error'); return; }

  const chunks = (typeof splitTextIntoChunks === 'function')
    ? splitTextIntoChunks(text, AUDIOBOOK_CHUNK_CHARS)
    : [text];

  _audiobook.running = true; _audiobook.cancel = false;
  if (typeof window.setNavCastingBadge === 'function') window.setNavCastingBadge(true);
  const ac = new AbortController();
  _audiobook.abort = () => ac.abort();

  if (overrideUrl && typeof overrideUrl !== 'string') overrideUrl = null;
  const llm_url = overrideUrl || audiobookLlmUrl(), language = audiobookLang();
  let model = overrideModel || audiobookLlmModel();
  const view = audiobookCastView(chunks.length, llm_url, model);

  view.processing('Waking up LLM model (this may take a few minutes if cold-booting)…');
  try {
    await fetch('/api/attribute-dialogue', {
      method: 'POST', headers: { 'Content-Type': 'application/json' }, signal: ac.signal,
      body: JSON.stringify({
        text: 'Wake up.', known_characters: [], recent: '', language,
        llm_url: document.getElementById('ab-cv-llm-url')?.value.trim() || llm_url,
        model: document.getElementById('ab-cv-llm-select')?.value || model
      })
    });
  } catch (err) {
    if (err.name === 'AbortError') { _audiobook.running = false; view.done(); return; }
  }

  const allSegments = [];
  _audiobook.liveSegments = allSegments; // expose so split works during casting
  const roster = [];
  let narrationOnly = 0;   // passages with no quotes at all — legitimately all narration
  let degraded = 0;        // passages with dialogue the LLM couldn't analyse → quotes auto-extracted
  // Page-mark tracking for visual page-break rows in the casting feed.
  const _pgMarks = (_audiobook.pageMarks || []).slice();
  if (_pgMarks.length && _pgMarks[0].offset <= 2) _pgMarks.shift(); // skip page-1 mark at pos 0
  let _pgMarkIdx = 0, _pgCharPos = 0;
  try {
    for (let i = 0; i < chunks.length; i++) {
      if (_audiobook.cancel) break;
      view.update(i);
      // Insert page-break markers in the feed when the source PDF page changes.
      while (_pgMarkIdx < _pgMarks.length && _pgCharPos >= _pgMarks[_pgMarkIdx].offset) {
        view.pagemark(_pgMarks[_pgMarkIdx].page + 1);
        _pgMarkIdx++;
      }
      _pgCharPos += chunks[i].length + 1; // +1 for joining space between chunks
      // No quotation marks anywhere → pure narration; skip the LLM entirely (faster, not an error)
      if (!audiobookHasDialogue(chunks[i])) {
        const seg = { speaker: 'Narrator', type: 'narration', text: chunks[i], emotion: '' };
        allSegments.push(seg); narrationOnly++; view.addSegments([seg]);
        continue;
      }
      // recent attributed dialogue → lets the LLM continue turn-taking across the boundary
      const recent = allSegments.filter(s => s.type === 'dialogue' && s.speaker && !/^Unknown|Unbekannt/i.test(s.speaker))
        .slice(-6).map(s => `${s.speaker}: ${(s.text || '').slice(0, 80)}`).join('\n');
      
      view.processing(chunks[i]);
      // ── Helper: run one attribution call and return parsed segments (or null on error) ──
      const attributeChunk = async (chunkText, recentCtx) => {
        try {
          const r = await fetch('/api/attribute-dialogue', {
            method: 'POST', headers: { 'Content-Type': 'application/json' },
            signal: ac.signal,
            body: JSON.stringify({ text: chunkText, known_characters: roster.slice(-40), recent: recentCtx, language, llm_url: document.getElementById('ab-cv-llm-url')?.value.trim() || llm_url, model: document.getElementById('ab-cv-llm-select')?.value || model }),
          });
          if (!r.ok) { const e = await r.json().catch(() => ({})); throw new Error(e.detail || e.error || r.statusText); }
          const d = await r.json();
          return Array.isArray(d.segments) ? d.segments : null;
        } catch (err) {
          if (err.name === 'AbortError') throw err;  // propagate cancel
          return { error: err.message };
        }
      };

      // ── First attempt ──
      let result = await attributeChunk(chunks[i], recent);
      let data = null;

      if (result && !result.error) {
        data = result;
      } else if (result && result.error) {
        // ── Retry: split the failing chunk in half and run both halves ──
        view.note(`⚠️ Passage ${i + 1} timed out — retrying in two halves…`);
        const half = Math.floor(chunks[i].length / 2);
        const splitAt = chunks[i].lastIndexOf(' ', half) || half;
        const chunkA = chunks[i].slice(0, splitAt).trim();
        const chunkB = chunks[i].slice(splitAt).trim();
        const resA = await attributeChunk(chunkA, recent);
        const resB = await attributeChunk(chunkB, recent);

        const segsA = (resA && !resA.error) ? resA : null;
        const segsB = (resB && !resB.error) ? resB : null;

        if (segsA || segsB) {
          data = [...(segsA || audiobookSplitByQuotes(chunkA)), ...(segsB || audiobookSplitByQuotes(chunkB))];
          if (!segsA) { degraded++; view.note(`⚠️ Passage ${i + 1} (first half) — auto-detected (retry also failed)`); }
          if (!segsB) { degraded++; view.note(`⚠️ Passage ${i + 1} (second half) — auto-detected (retry also failed)`); }
        } else {
          // Both halves also failed
          view.note(`❌ Passage ${i + 1} — LLM error: ${result.error}`);
          data = null;
        }
      }

      let segs = Array.isArray(data) ? data : (data && Array.isArray(data.segments) ? data.segments : []);
      const hasDialogue = segs.some(s => s.type === 'dialogue');
      if (!segs.length || (!hasDialogue && audiobookHasDialogue(chunks[i]))) {
        // LLM completely unavailable — extract dialogue from quotes without speaker attribution
        segs = audiobookSplitByQuotes(chunks[i]);
        degraded++;
        const named = segs.filter(s => s.type === 'dialogue' && !/^Unknown|Unbekannt/i.test(s.speaker)).length;
        view.note(`Passage ${i + 1} — auto-detected dialogue${named ? ` (${named} speaker${named !== 1 ? 's' : ''} from tags)` : ' (set speakers in review)'}`);
      } else {
        // Clean up LLM hallucinations where it outputs the same text twice or leaves quotes in narration
        let cleanedSegs = [];
        for (let s of segs) {
          s.text = s.text || '';
          
          // Strict validation: if LLM claims it's dialogue, but the original text has NO quotes around it, it's a hallucination.
          if (s.type === 'dialogue' && s.text.trim().length > 10) {
            const tText = s.text.trim();
            // Try to find the text in the original chunk to check its surroundings
            const idx = chunks[i].indexOf(tText);
            if (idx !== -1) {
              const surround = chunks[i].slice(Math.max(0, idx - 8), idx) + chunks[i].slice(idx + tText.length, idx + tText.length + 8);
              if (!/[«»„“”"‟‚‘’›‹『「—–]/.test(surround)) {
                s.type = 'narration';
                s.speaker = 'Narrator';
                s.emotion = '';
              }
            }
          }

          if (cleanedSegs.length > 0) {
            let last = cleanedSegs[cleanedSegs.length - 1];
            if (s.text.trim() === last.text.trim()) {
              if (s.type === 'dialogue' && last.type !== 'dialogue') {
                cleanedSegs[cleanedSegs.length - 1] = s; continue;
              } else if (s.type !== 'dialogue' && last.type === 'dialogue') {
                continue;
              } else { continue; }
            }
            if (s.type === 'dialogue' && last.type === 'narration') {
              const tS = s.text.trim(), tL = last.text.trim();
              if (tL.endsWith(tS)) {
                 last.text = tL.slice(0, -tS.length).trim();
                 if (!last.text) cleanedSegs.pop();
              }
            }
          }
          if (s.text.trim()) cleanedSegs.push(s);
        }
        
        // Merge consecutive narration segments to preserve paragraph flow
        let mergedSegs = [];
        for (let s of cleanedSegs) {
          if (mergedSegs.length > 0) {
            let last = mergedSegs[mergedSegs.length - 1];
            if (s.type === 'narration' && last.type === 'narration' && (s.speaker || 'Narrator').toLowerCase() === 'narrator' && (last.speaker || 'Narrator').toLowerCase() === 'narrator') {
              // Only add a newline if they don't already flow perfectly (e.g. LLM split mid-sentence)
              // But usually we just join with double newline to preserve paragraphs, or single space if it's mid-sentence.
              // A safe heuristic: if it ends with punctuation, use double newline (paragraph break).
              if (/[.!?]$/.test(last.text.trim())) {
                last.text = last.text.trimEnd() + '\n\n' + s.text.trimStart();
              } else {
                last.text = last.text.trimEnd() + ' ' + s.text.trimStart();
              }
              continue;
            }
          }
          mergedSegs.push(s);
        }
        segs = mergedSegs;
      }
      // harvest speaker names (from LLM or tag heuristic) into the running roster
      segs.forEach(s => { const speakerName = (s.type !== 'dialogue' || !s.speaker || s.speaker.toLowerCase() === 'narrator') ? 'Narrator' : s.speaker; if (!/^Unknown|Unbekannt/i.test(speakerName) && !roster.includes(speakerName)) roster.push(speakerName); });
      segs.forEach(s => allSegments.push(s));
      view.addSegments(segs);
    }
    view.update(chunks.length);
  } finally {
    _audiobook.running = false;
  }

  if (!allSegments.length) { view.done(); toast('No segments produced', 'error'); return; }

  _audiobook.segments = allSegments;
  _audiobook.lastText = text;
  _audiobook.roster = roster;
  _audiobook.narratedPassages = narrationOnly;
  _audiobook.degraded = degraded;

  if (_audiobook.cancel) toast('Casting stopped early. Progress preserved.', 'info');

  // Park the panel with a "Review & cast" button (don't auto-pop, in case you wandered off)
  const speakers = new Set(allSegments.filter(s => s.type === 'dialogue' && s.speaker).map(s => s.speaker));
  const summary = `${speakers.size} character${speakers.size !== 1 ? 's' : ''} · ${allSegments.length} segments`;
  view.complete(summary, audiobookShowPreview, audiobookCast, audiobookRecastUnknown);
}

// ── Editable attribution preview ─────────────────────────────────────────────

function audiobookShowPreview() {
  const segs = _audiobook.segments || [];
  const roster = _audiobook.roster || [];
  document.getElementById('audiobook-preview')?.remove();
  const ov = document.createElement('div');
  ov.id = 'audiobook-preview';
  ov.className = 'audiobook-overlay';
  // datalist = Narrator + LLM roster + any speakers present in the segments (incl. Unknown)
  const speakerSet = [...new Set(['Narrator', ...roster, ...segs.filter(s => s.type === 'dialogue' && s.speaker).map(s => s.speaker)])];
  const charCount = speakerSet.filter(n => !/^Unknown|Unbekannt/i.test(n)).length;
  const opts = speakerSet.map(n => `<option value="${escHtml(n)}">`).join('');
  ov.innerHTML = `<div class="audiobook-box audiobook-preview-box">
    <div class="audiobook-title"><span class="mdi mdi-drama-masks"></span> Review cast &amp; lines
      <span class="audiobook-count">${segs.length} segments · ${charCount} character${charCount !== 1 ? 's' : ''}</span></div>
    <div class="audiobook-msg">Fix any wrong speaker or emotion, then open in the Script Rehearser to assign voices.${_audiobook.narratedPassages ? ` <span class="audiobook-narr-note">${_audiobook.narratedPassages} passage${_audiobook.narratedPassages !== 1 ? 's' : ''} had no dialogue (narrator).</span>` : ''}${_audiobook.degraded ? ` <span class="audiobook-narr-note">${_audiobook.degraded} passage${_audiobook.degraded !== 1 ? 's' : ''} used quick detection — set the “Unknown” speakers.</span>` : ''}</div>
    <datalist id="audiobook-roster">${opts}</datalist>
    <div class="audiobook-seglist" id="audiobook-seglist"></div>
    <div class="audiobook-actions">
      <button class="btn-secondary btn-sm" id="audiobook-preview-cancel">Cancel</button>
      <button class="btn-primary btn-sm" id="audiobook-preview-open"><span class="mdi mdi-account-music-outline"></span> Open in Rehearser</button>
    </div>
  </div>`;
  document.body.appendChild(ov);
  ov.querySelector('#audiobook-seglist').innerHTML = segs.map((s, i) => `<div class="audiobook-seg${s.type === 'dialogue' ? ' is-dialog' : ''}">
    <input class="audiobook-seg-sp" data-i="${i}" list="audiobook-roster" value="${escHtml(s.speaker || 'Narrator')}" aria-label="Speaker">
    <input class="audiobook-seg-emo" data-i="${i}" value="${escHtml(s.emotion || '')}" placeholder="emotion" aria-label="Emotion"${s.type === 'dialogue' ? '' : ' disabled'}>
    <div class="audiobook-seg-text">${highlightText(s.text || '')}</div>
  </div>`).join('');
  ov.querySelector('#audiobook-preview-cancel').addEventListener('click', () => ov.remove());
  ov.querySelector('#audiobook-preview-open').addEventListener('click', () => { audiobookApplyPreviewAndOpen(); ov.remove(); });
}

function audiobookApplyPreviewAndOpen() {
  const segs = _audiobook.segments;
  document.querySelectorAll('#audiobook-seglist .audiobook-seg-sp').forEach(inp => {
    const i = +inp.dataset.i; const v = inp.value.trim() || 'Narrator';
    segs[i].speaker = v;
    segs[i].type = (v.toLowerCase() === 'narrator') ? 'narration' : 'dialogue';
  });
  document.querySelectorAll('#audiobook-seglist .audiobook-seg-emo').forEach(inp => {
    const i = +inp.dataset.i; segs[i].emotion = inp.value.trim();
  });
  const { script, emotions } = audiobookBuildScript(segs);
  audiobookOpenInRehearser(script, (readerState.title || 'Audiobook'), emotions);
}

// Build a rehearser script (CAPS speaker + line; narration as plain paragraphs)
// and a parallel list of per-dialogue-line emotions (same order as dialog lines).
// Inserts \f page-break markers at the segment boundary nearest each source PDF
// page start (so saved/opened scripts keep the book's pagination). Page positions
// are realigned per-segment against the source text to avoid cumulative drift.
function audiobookBuildScript(segments) {
  let script = '';
  const emotions = [];
  const marks = _audiobook.pageMarks || [];
  const src = _audiobook.lastText || '';
  let markIdx = 0, searchPos = 0;
  // The first page mark sits at the start of the document — no leading break.
  if (marks.length && marks[0].offset <= 2) markIdx = 1;

  for (const s of segments) {
    const t = (s.text || '').trim(); if (!t) continue;
    // Where does this segment sit in the source text? (verbatim narration matches
    // exactly; dialogue text — quotes stripped — still occurs in the source.)
    if (src && markIdx < marks.length) {
      const probe = t.slice(0, 24);
      const at = probe ? src.indexOf(probe, searchPos) : -1;
      const pos = at >= 0 ? at : searchPos;
      if (at >= 0) searchPos = at + probe.length;
      while (markIdx < marks.length && pos >= marks[markIdx].offset) {
        if (script.trim()) {
          script += `\n\f${marks[markIdx].page + 1}\n`;  // page break — 1-indexed page number
        }
        markIdx++;
      }
    }
    const isDialogue = s.type === 'dialogue' && s.speaker && s.speaker.toLowerCase() !== 'narrator';
    if (isDialogue) {
      script += '\n' + s.speaker.toUpperCase() + '\n' + t + '\n';
      emotions.push(s.emotion || '');
    } else {
      script += '\n' + t + '\n';   // narration → narrator reads these
    }
  }
  return { script: script.trim(), emotions };
}

async function audiobookOpenInRehearser(script, title, dialogueEmotions) {
  if ($('reh-script-text'))  $('reh-script-text').value = script;
  if ($('reh-script-title')) $('reh-script-title').value = title;
  if (typeof navTo === 'function') navTo('s-rehearser');
  // Reuse the rehearser's own parse flow (builds lines, cast, jumps to Cast phase)
  const btn = $('reh-parse-btn');
  if (btn) btn.click();
  else if (typeof parseScript === 'function') { rehState.lines = parseScript(script); }
  // Apply per-line emotions to dialog lines in order (Phase 3: emotion-aware narration)
  let speakers = 0, lines = 0;
  if (window.rehState && Array.isArray(rehState.lines)) {
    let k = 0;
    rehState.lines.forEach(l => { if (l.type === 'dialog') { const e = dialogueEmotions[k++]; if (e) l.emotion = e; lines++; } });
    speakers = Object.keys(rehState.cast || {}).filter(s => !String(s).includes('NARRATOR')).length;
  }
  // Persist as a reopenable rehearsal so the cast/lines aren't lost — find it under
  // Script Rehearser → Bibliothek (Library) and reopen anytime to edit & synthesise.
  let saved = false;
  if (typeof saveToLibrary === 'function') {
    try { rehState.savedId = null; await saveToLibrary(); saved = true; } catch (_) {}
  }
  toast(`Cast ${speakers} character${speakers !== 1 ? 's' : ''} · ${lines} lines` + (saved ? ' — saved to Rehearser → Bibliothek' : ''), 'success');
}

// ── Audiobook export (rehearser): synthesise every line → MP3 per chapter ────

function audiobookIsChapter(line) {
  if (line.type === 'act' || line.type === 'scene') return true;
  const t = (typeof stripMarkdown === 'function' ? stripMarkdown(line.text || '') : (line.text || '')).trim();
  if (!t || t.length > 60) return false;
  return /^(chapter|kapitel|chap\.?|part|book|prologue|epilogue|prolog|epilog|teil)\b/i.test(t);
}

function audiobookLineVoice(l) {
  if (l.type === 'dialog') {
    const c = rehState.cast[l.speaker] || {};
    return { voice: c.voice, instruct: (typeof _buildInstruct === 'function' ? _buildInstruct(c.instruct, l.emotion) : '') };
  }
  return { voice: rehState.narratorVoice, instruct: '' };
}

async function audiobookExport() {
  if (_audiobook.running) return;
  if (!window.rehState || !(rehState.lines || []).length) { toast('Open a script in the rehearser first', 'error'); return; }
  if (!rehState.backend) { toast('Select a TTS backend in the rehearser first', 'error'); return; }
  if (typeof _ensureNarrator === 'function') _ensureNarrator();

  const speakable = i => {
    const l = rehState.lines[i];
    if (!l || l.ignored || l.hidden) return false;
    if (l.type === 'dialog') { const c = rehState.cast[l.speaker]; return !!(c && c.voice && c.voice !== 'me'); }
    return !!(rehState.narratorVoice && (l.text || '').trim());
  };

  // Bucket speakable lines into chapters (by chapter headings / act / scene)
  const buckets = [];
  let cur = null;
  rehState.lines.forEach((l, i) => {
    if (audiobookIsChapter(l)) { cur = { title: (typeof stripMarkdown === 'function' ? stripMarkdown(l.text) : l.text).trim().slice(0, 50), idx: [] }; buckets.push(cur); }
    if (speakable(i)) { if (!cur) { cur = { title: '', idx: [] }; buckets.push(cur); } cur.idx.push(i); }
  });
  const allIdx = buckets.flatMap(b => b.idx);
  if (!allIdx.length) { toast('Nothing to synthesise — cast voices first', 'error'); return; }

  _audiobook.running = true; _audiobook.cancel = false;
  const prog = audiobookProgress(allIdx.length);
  const mp3 = new Map();
  let done = 0;
  const queue = allIdx.slice();
  const worker = async () => {
    while (queue.length && !_audiobook.cancel) {
      const i = queue.shift();
      const l = rehState.lines[i];
      const { voice, instruct } = audiobookLineVoice(l);
      const text = (typeof _rehInlineTone === 'function')
        ? _rehInlineTone(stripMarkdown(l.text), l.emotion)
        : (typeof stripMarkdown === 'function' ? stripMarkdown(l.text) : l.text);
      try { mp3.set(i, await fetchTtsPreviewBlob(voice, text, 'mp3', instruct, rehState.backend)); } catch (_) {}
      prog.update(++done, `Synthesising line ${done} / ${allIdx.length}…`);
    }
  };
  try { await Promise.all(Array.from({ length: Math.min(2, allIdx.length) }, worker)); }
  finally { prog.done(); _audiobook.running = false; }

  if (_audiobook.cancel) { toast('Export cancelled', 'error'); return; }
  const title = (typeof readerSafeName === 'function' ? readerSafeName($('reh-script-title')?.value || 'Audiobook') : ($('reh-script-title')?.value || 'Audiobook'));
  const realChapters = buckets.filter(b => b.title).length > 0;
  let files = 0;
  for (let c = 0; c < buckets.length; c++) {
    const blobs = buckets[c].idx.map(i => mp3.get(i)).filter(Boolean);
    if (!blobs.length) continue;
    const blob = new Blob(blobs, { type: 'audio/mpeg' });
    const ch = buckets[c].title ? ' ' + readerSafeName(buckets[c].title) : '';
    const name = (realChapters || buckets.length > 1)
      ? `${title} - ${String(c + 1).padStart(2, '0')}${ch}.mp3`
      : `${title}.mp3`;
    if (typeof readerDownload === 'function') readerDownload(blob, name);
    files++;
    await new Promise(r => setTimeout(r, 400));
  }
  toast('Exported audiobook · ' + files + (realChapters ? ' chapter MP3 file(s)' : ' MP3 file(s)'), 'success');
}

// ── Wiring ───────────────────────────────────────────────────────────────────

$('reader-audiobook-btn')?.addEventListener('click', audiobookOpenCastView);
$('reh-tb-audiobook')?.addEventListener('click', audiobookExport);

async function audiobookSaveAsRehearsal() {
  const segs = _audiobook.segments;
  if (!segs || !segs.length) { toast('No segments to save', 'error'); return; }
  
  const { script, emotions } = audiobookBuildScript(segs);
  const title = (typeof readerState !== 'undefined' && readerState.title) ? readerState.title : 'Audiobook';
  
  // Need to parse lines to get cast
  const lines = (typeof parseScript === 'function') ? parseScript(script) : [];
  if (emotions && emotions.length) {
    let eIdx = 0;
    lines.forEach(l => {
      if (l.type === 'dialog' && eIdx < emotions.length) {
        if (emotions[eIdx]) l.emotion = emotions[eIdx];
        eIdx++;
      }
    });
  }
  
  const cast = {};
  if (typeof detectCharacters === 'function') {
    const detected = detectCharacters(lines);
    Object.entries(detected).forEach(([sp, def]) => {
      cast[sp] = {
         voice: def.voice, color: def.color, instruct: '',
         lang: '', gender: '', tags: '', soul: '',
         ignored: false, hidden: false, voiceData: null,
      };
    });
  }
  
  const rec = {
    title: title,
    script: script,
    cast: cast,
    emotions: {},
    notes: {}, ignored: {}, hidden: {},
    backend: '', narratorVoice: '',
    lineIndex: 0, clips: [],
    created: new Date(),
    updated: new Date(),
  };
  
  // extract emotions for the record
  lines.forEach((l, i) => {
    if (l.type === 'dialog' && l.emotion) rec.emotions[i] = l.emotion;
  });

  if (typeof rehDbAdd === 'function') {
    try {
      await rehDbAdd(rec);
      toast('Saved as Script Rehearsal', 'success');
      if (typeof renderLibraryList === 'function') renderLibraryList();
    } catch (e) {
      toast('Failed to save rehearsal: ' + e.message, 'error');
    }
  } else {
    toast('Rehearser DB not available', 'error');
  }
}