// ── Audiobook cast serialization ────────────────────────────────────────────
// Live casting remains in audiobook.js; these deterministic export/migration
// helpers have no casting-state side effects and can be loaded independently.

function _abCastMarkdown(data) {
  const payload = data || {};
  const segments = Array.isArray(payload.segments) ? payload.segments : [];
  const speakers = [...new Set(segments.filter(s => s?.type === 'dialogue' && s.speaker).map(s => String(s.speaker)))].sort();
  const lines = [`# ${payload.title || 'Cast Script'}`, ''];
  const metaBits = [];
  if (payload.savedAt) metaBits.push('exported ' + new Date(payload.savedAt).toISOString().slice(0, 16).replace('T', ' '));
  metaBits.push(`${speakers.length} character${speakers.length !== 1 ? 's' : ''}`);
  metaBits.push(`${segments.length} segment${segments.length !== 1 ? 's' : ''}`);
  lines.push(`*${metaBits.join(' · ')}*`, '');
  if (speakers.length) lines.push(`**Characters:** ${speakers.join(', ')}`, '');
  let lastPage = null;
  for (const seg of segments) {
    const text = String(seg?.text || '').trim();
    if (!text) continue;
    if (seg.page != null && seg.page !== lastPage) {
      lines.push('---', '', `## Page ${seg.page}`, '');
      lastPage = seg.page;
    }
    if (seg.type === 'dialogue') {
      const speaker = String(seg.speaker || 'Narrator');
      const tag = seg.emotion ? ` *(${seg.emotion})*` : '';
      lines.push(`**${speaker.toUpperCase()}**${tag}: "${text}"`);
    } else lines.push(text);
    lines.push('');
  }
  return lines.join('\n');
}

function _abStampSegmentPages(segs, pageMarks, text) {
  if (!Array.isArray(segs) || !segs.length || segs.some(s => s && s.page != null)) return;
  const marks = (pageMarks || []).slice().sort((a, b) => (a.offset || 0) - (b.offset || 0));
  const src = text || '';
  if (!marks.length || !src) return;
  let markIdx = 0, searchPos = 0, cur = null;
  if (marks[0].offset <= 2) { cur = marks[0].page + 1; markIdx = 1; }
  for (const s of segs) {
    const probe = String(s.text || '').trim().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) {
      cur = marks[markIdx].page + 1;
      markIdx++;
    }
    if (cur != null) s.page = cur;
  }
}

// Merge adjacent segments assigned to the same speaker without crossing a
// page boundary. Kept separate from the live casting orchestration because it
// is a deterministic post-cast normalization pass.
function _audiobookMergeAdjacentSameSpeaker(segments) {
  const out = [];
  for (const s of segments) {
    const last = out[out.length - 1];
    if (last && last.type === s.type && last.page === s.page) {
      const lastSpeaker = (last.speaker || 'Narrator').trim().toLowerCase();
      const curSpeaker = (s.speaker || 'Narrator').trim().toLowerCase();
      // Dialogue keeps its emotion tag distinct so one mood is not silently
      // discarded when two adjacent rows are combined.
      const sameEmotion = s.type !== 'dialogue' || (last.emotion || '').toLowerCase() === (s.emotion || '').toLowerCase();
      const unknownSpeaker = !lastSpeaker || lastSpeaker === 'unknown' || lastSpeaker === 'unbekannt';
      if (lastSpeaker === curSpeaker && sameEmotion && !(s.type === 'dialogue' && unknownSpeaker)) {
        const lastText = last.text.trimEnd(), curText = s.text.trimStart();
        last.text = /[.!?…»«”"’']$/.test(lastText) ? lastText + '\n\n' + curText : lastText + ' ' + curText;
        continue;
      }
    }
    out.push(Object.assign({}, s));
  }
  return out;
}

// Merge consecutive segments spoken by the same named character. This is a
// dialogue-only normalization pass; narration is intentionally left alone.
function _audiobookMergeAdjacentDialogue(segments) {
  const out = [];
  let merged = 0;
  for (const s of segments) {
    if (out.length) {
      const last = out[out.length - 1];
      const spk = String(s.speaker || '').trim().toLowerCase();
      const known = spk && !/^(unknown|unbekannt|narrator)$/i.test(spk);
      if (last.type === 'dialogue' && s.type === 'dialogue' && known
          && String(last.speaker || '').trim().toLowerCase() === spk) {
        const a = String(last.text || '').trimEnd(), b = String(s.text || '').trimStart();
        last.text = a + (/[.!?…»«"']$/.test(a) ? '\n\n' : ' ') + b;
        if (!String(last.emotion || '').trim() && String(s.emotion || '').trim()) last.emotion = s.emotion;
        merged++;
        continue;
      }
    }
    out.push(s);
  }
  return { segments: out, merged };
}

function _audiobookMergeSplitSentences(segments) {
  const out = [];
  let merged = 0;
  for (const s of segments) {
    const prev = out[out.length - 1];
    const cur = String(s?.text || '').trim();
    if (prev && prev.type === 'narration' && s?.type === 'narration' && cur) {
      const prevText = String(prev.text || '').trimEnd();
      const endsOpen = prevText && !/[.!?:;…»"'\)\]]$/.test(prevText);
      const startsLower = /^[a-zäöüß]/.test(cur);
      const prevIsInquit = new RegExp(_AB_INQUIT_VERBS + "[^.!?]{0,40},\\s*$", 'i').test(prevText);
      if (endsOpen && startsLower && !prevIsInquit) {
        prev.text = prevText + ' ' + cur;
        merged++;
        continue;
      }
    }
    out.push(s);
  }
  return { segments: out, merged };
}

function _audiobookDedupNearbyDuplicates(segments) {
  const QUOTE_CHARS = '»«„"‘’›‹';
  const stripRe = new RegExp(`(^[${QUOTE_CHARS}\\s]+)|([${QUOTE_CHARS}\\s]+$)`, 'g');
  const norm = (t) => String(t || '').replace(stripRe, '').toLowerCase().replace(/\s+/g, ' ').trim();
  const WINDOW = 30;
  const MIN_LEN = 20;
  const out = [];
  let removed = 0;
  for (const s of segments) {
    const nt = norm(s?.text);
    if (nt.length >= MIN_LEN) {
      let isDup = false;
      for (let k = out.length - 1; k >= 0 && out.length - k <= WINDOW; k--) {
        if (out[k].type === s.type && norm(out[k].text) === nt) { isDup = true; break; }
      }
      if (isDup) { removed++; continue; }
    }
    out.push(s);
  }
  return { segments: out, removed };
}

const _AB_TITLE_PREFIX = /^(?:der|die|das|den|dem|ein|eine|einer|herr|frau|oberst|obrist|graf|gräfin|ritter|hauptmann|kommandant|meister|bruder|schwester|prinz|prinzessin|könig|königin|alter|alte|junger|junge|blonder|blonde)\s+/i;
function _abIdentityTokens(name) {
  let n = String(name || '').trim().toLowerCase(), prev = null;
  while (prev !== n) { prev = n; n = n.replace(_AB_TITLE_PREFIX, ''); }
  return n.split(/[\s\-]+/).filter(Boolean);
}

const _AB_NOT_A_CHARACTER = new Set([
  'hinter','vor','neben','über','unter','zwischen','gegenüber','keiner','keine','niemand','jemand','alle','beide',
  'einige','viele','andere','anderen','jeder','jede','man','von','zu','bei','nach','aus','mit','ihm','ihr','ihnen',
  'dort','hier','draußen','drinnen','oben','unten','plötzlich','endlich','schließlich',
  'inneren','innere','herz','herzen','hand','hände','haenden','kopf','stimme','stimmen','wind','feuer','flamme','flammen',
  'dunkelheit','stille','schatten','licht','nacht','angst','schmerz','gedanke','gedanken','traum','träume','geliebten',
  'geliebter','geliebte','blondschopf','antwort','echo','ferne','nähe','naehe','tiefe','wasser','regen','donner','erde',
  'himmel','sonne','mond','tod','leben','seele','geist der','wahrheit','zweifel','hoffnung','erinnerung','vergangenheit'
]);
function _abIsImplausibleSpeaker(name) {
  const n = String(name || '').trim().toLowerCase().replace(/^(?:der|die|das|den|dem|ein|eine|einer|einem)\s+/, '');
  return Boolean(n) && _AB_NOT_A_CHARACTER.has(n);
}
function _audiobookDropPhantomSpeakers(segments) {
  let dropped = 0;
  const names = new Set();
  for (const s of segments) {
    if (s?.type !== 'dialogue') continue;
    if (_abIsImplausibleSpeaker(s.speaker)) { names.add(s.speaker); s.speaker = 'Unknown'; dropped++; }
  }
  return { dropped, names: [...names] };
}

function _audiobookConsolidateSpeakerAliases(segments) {
  const count = new Map();
  for (const s of segments) {
    if (s?.type !== 'dialogue') continue;
    const sp = String(s.speaker || '').trim();
    if (!sp || /^(unknown|unbekannt|narrator)/i.test(sp)) continue;
    count.set(sp, (count.get(sp) || 0) + 1);
  }
  const names = [...count.keys()];
  const tokens = new Map(names.map(n => [n, new Set(_abIdentityTokens(n))]));
  const mapping = new Map();
  for (const a of names) {
    const ta = tokens.get(a);
    if (!ta.size) continue;
    let best = null;
    for (const b of names) {
      if (a === b) continue;
      const tb = tokens.get(b);
      if (!tb.size || tb.size <= ta.size) continue;
      let subset = true;
      for (const t of ta) if (!tb.has(t)) { subset = false; break; }
      if (!subset) continue;
      if (!best || count.get(b) > count.get(best) || (count.get(b) === count.get(best) && b.length > best.length)) best = b;
    }
    if (best) mapping.set(a, best);
  }
  let moved = 0;
  for (const s of segments) {
    if (s?.type !== 'dialogue') continue;
    const to = mapping.get(String(s.speaker || '').trim());
    if (to) { s.speaker = to; moved++; }
  }
  return { merged: mapping.size, moved, mapping };
}

window.TTVC = window.TTVC || {};
window.TTVC.audiobook = window.TTVC.audiobook || {};
window.TTVC.audiobook.cast = {
  toMarkdown: _abCastMarkdown,
  stampPages: _abStampSegmentPages,
  mergeAdjacentSameSpeaker: _audiobookMergeAdjacentSameSpeaker,
  mergeAdjacentDialogue: _audiobookMergeAdjacentDialogue,
  mergeSplitSentences: _audiobookMergeSplitSentences,
  dedupNearbyDuplicates: _audiobookDedupNearbyDuplicates,
  dropPhantomSpeakers: _audiobookDropPhantomSpeakers,
  consolidateSpeakerAliases: _audiobookConsolidateSpeakerAliases,
};