import { S } from './state.js';
import { esc, toast } from './utils.js';

// ─── HTTP HELPERS ───
// API calls are routed through the NovaSonic backend proxy to avoid CORS restrictions.
// Audio streaming uses <audio src> directly (HTML media elements bypass CORS).
async function absRequest(method, path, body) {
  const backend = S.cfg.backendUrl;
  let url, headers;

  if (backend) {
    // Proxy through NovaSonic backend — no CORS issue
    url = `${backend}/api/abs-proxy${path}`;
    headers = {
      'Content-Type':  'application/json',
      'X-ABS-URL':     S.abs.url,
      'X-ABS-Token':   S.abs.token || '',
    };
  } else {
    // Direct — requires CORS to be configured on the ABS server
    url = `${S.abs.url}${path}`;
    headers = { 'Content-Type': 'application/json' };
    if (S.abs.token) headers['Authorization'] = `Bearer ${S.abs.token}`;
  }

  const opts = { method, headers };
  if (body !== undefined) opts.body = JSON.stringify(body);
  const res = await fetch(url, opts);
  if (!res.ok) {
    const txt = await res.text().catch(() => '');
    throw new Error(`ABS ${method} ${path}: HTTP ${res.status} ${txt.slice(0, 120)}`);
  }
  const txt = await res.text();
  return txt ? JSON.parse(txt) : {};
}
const absGet   = p       => absRequest('GET',   p);
const absPost  = (p, b)  => absRequest('POST',  p, b);
const absPatch = (p, b)  => absRequest('PATCH', p, b);

// ─── AUTH ───
export async function absVerifyApiKey(url, apiKey) {
  S.abs.url   = url.replace(/\/$/, '');
  S.abs.token = apiKey;
  // Verify by fetching current user — throws if token is invalid
  const me = await absGet('/api/me');
  S.abs.userId = me.id || null;
  return me;
}

// ─── LIBRARIES ───
export async function absGetLibraries() {
  const d = await absGet('/api/libraries');
  return d.libraries || [];
}

export async function absGetItems(libId, { page = 0, limit = 100, search = '' } = {}) {
  if (search) {
    const d = await absGet(`/api/libraries/${libId}/search?q=${encodeURIComponent(search)}&limit=40`);
    const items = (d.book || d.podcast || []).map(r => r.libraryItem || r);
    return { items, total: items.length };
  }
  const d = await absGet(
    `/api/libraries/${libId}/items?expanded=1&limit=${limit}&page=${page}` +
    `&sort=media.metadata.title&asc=1&include=progress`
  );
  return { items: d.results || [], total: d.total || 0 };
}

export async function absGetItem(itemId) {
  return absGet(`/api/items/${itemId}?expanded=1`);
}

export function absCoverUrl(itemId) {
  if (!S.abs.token || !S.abs.url || !itemId) return null;
  return `${S.abs.url}/api/items/${itemId}/cover?token=${encodeURIComponent(S.abs.token)}`;
}

// ─── PROGRESS ───
export async function absGetProgress(itemId) {
  try { return await absGet(`/api/me/progress/${itemId}`); } catch { return null; }
}

async function absSaveProgress(itemId, currentTime, duration) {
  if (!itemId || !S.abs.token) return;
  try {
    const progress = duration > 0 ? Math.min(1, currentTime / duration) : 0;
    await absPatch(`/api/me/progress/${itemId}`, {
      currentTime, duration, progress,
      isFinished: progress >= 0.99,
      lastUpdate: Date.now(),
    });
  } catch (e) { console.warn('ABS progress sync failed:', e.message); }
}

// ─── PLAYBACK SESSION ───
async function absStartSession(itemId) {
  return absPost(`/api/items/${itemId}/play`, {
    deviceInfo: { clientName: 'NovaSonic', clientVersion: '1.0' },
    supportedMimeTypes: ['audio/mpeg', 'audio/mp4', 'audio/aac', 'audio/ogg', 'audio/flac', 'audio/m4b'],
    mediaPlayer: 'html5',
    forceDirectPlay: true,
    forceTranscode: false,
  });
}

async function absCloseSession(sessionId) {
  try { await absPost(`/api/session/${sessionId}/close`, {}); } catch {}
}

// ─── PLAYER INTERNALS ───
let _audio = null;
let _syncTimer = null;
let _sleepTimer = null;
let _sleepEndTime = null;
let _sleepTick = null;

function _getAudio() {
  if (!_audio) {
    _audio = document.getElementById('abs-audio');
    _audio.addEventListener('timeupdate', _onTimeUpdate);
    _audio.addEventListener('ended',      _onTrackEnded);
    _audio.addEventListener('play',  () => { S.absPlayer.playing = true;  _renderControls(); _startSync(); });
    _audio.addEventListener('pause', () => { S.absPlayer.playing = false; _renderControls(); _doSync(); });
  }
  return _audio;
}

function _globalTime() {
  const ap = S.absPlayer;
  const track = ap.audioTracks[ap.trackIdx];
  return (track?.startOffset ?? 0) + (_audio?.currentTime ?? 0);
}

function _onTimeUpdate() {
  const ap = S.absPlayer;
  ap.currentTime = _globalTime();
  _updateChapter();
  _renderProgress();
}

function _onTrackEnded() {
  const ap = S.absPlayer;
  if (ap.trackIdx < ap.audioTracks.length - 1) {
    ap.trackIdx++;
    _loadTrack(ap.trackIdx, 0);
    _audio.play().catch(() => {});
  } else {
    ap.playing = false;
    _doSync(true);
    _renderControls();
    toast('📚 Hörbuch beendet');
  }
}

function _loadTrack(idx, localOffset = 0) {
  const ap = S.absPlayer;
  const track = ap.audioTracks[idx];
  if (!track) return;
  ap.trackIdx = idx;
  const sep = track.contentUrl.includes('?') ? '&' : '?';
  _audio.src = `${S.abs.url}${track.contentUrl}${sep}token=${encodeURIComponent(S.abs.token)}`;
  _audio.playbackRate = ap.speed;
  _audio.currentTime = Math.max(0, localOffset);
}

function _findTrack(globalTime) {
  const tracks = S.absPlayer.audioTracks;
  if (!tracks.length) return { idx: 0, local: globalTime };
  let idx = 0;
  for (let i = 0; i < tracks.length; i++) {
    if (globalTime >= tracks[i].startOffset) idx = i;
  }
  return { idx, local: Math.max(0, globalTime - (tracks[idx].startOffset ?? 0)) };
}

function _updateChapter() {
  const ap = S.absPlayer;
  if (!ap.chapters.length) return;
  const t = ap.currentTime;
  let idx = 0;
  for (let i = 0; i < ap.chapters.length; i++) {
    if (ap.chapters[i].start <= t) idx = i;
  }
  if (idx !== ap.chapterIdx) {
    ap.chapterIdx = idx;
    _renderChapterName();
    _renderChapterList();
    if (_playlistMode) {
      const cl = document.getElementById('abs-chapter-list');
      setTimeout(() => cl?.querySelector('.abs-ch-item.active')?.scrollIntoView({ block: 'nearest', behavior: 'smooth' }), 30);
    }
  }
}

function _startSync() {
  if (_syncTimer) return;
  _syncTimer = setInterval(() => _doSync(), 30_000);
}
function _stopSync() { if (_syncTimer) { clearInterval(_syncTimer); _syncTimer = null; } }
function _doSync(finished = false) {
  const ap = S.absPlayer;
  if (ap.item) absSaveProgress(ap.item.id, ap.currentTime, ap.duration);
}

// ─── PUBLIC PLAYER ───
export async function absPlayItem(item) {
  const ap = S.absPlayer;
  const audio = _getAudio();

  if (!S.audio.paused) S.audio.pause(); // stop music if playing
  if (ap._sessionId) { absCloseSession(ap._sessionId); ap._sessionId = null; }
  _stopSync();
  audio.pause();

  toast('⏳ Lade Hörbuch…');
  let session;
  try {
    session = await absStartSession(item.id);
  } catch (e) {
    toast(`❌ ${e.message}`);
    return;
  }

  const tracks   = session.audioTracks || [];
  const chapters = session.chapters || item.media?.chapters || [];
  const duration = tracks.reduce((s, t) => s + (t.duration ?? 0), 0) || (item.media?.duration ?? 0);

  const saved = await absGetProgress(item.id);
  const startTime = (saved?.currentTime && saved.currentTime > 10) ? saved.currentTime : 0;

  ap.item       = item;
  ap._sessionId = session.id;
  ap.audioTracks = tracks;
  ap.chapters   = chapters;
  ap.duration   = duration;
  ap.currentTime = startTime;
  ap.chapterIdx = -1;
  ap.speed      = ap.speed || 1.0;

  if (tracks.length) {
    const { idx, local } = _findTrack(startTime);
    _loadTrack(idx, local);
  } else if (item.media?.audioFiles?.[0]) {
    const f = item.media.audioFiles[0];
    _audio.src = `${S.abs.url}/api/items/${item.id}/file/${f.index ?? 0}?token=${encodeURIComponent(S.abs.token)}`;
    _audio.playbackRate = ap.speed;
    _audio.currentTime = startTime;
    ap.duration = item.media.duration || 0;
  }

  _updateChapter();
  absOpenPlayer();
  _renderPlayer();

  try { await audio.play(); } catch (e) { toast('Wiedergabe: ' + e.message); }
}

export function absTogglePlay() {
  const audio = _getAudio();
  S.absPlayer.playing ? audio.pause() : audio.play().catch(() => {});
}

export function absInterrupt() {
  if (!S.absPlayer.item || !S.absPlayer.playing) return;
  _getAudio().pause(); // triggers the pause listener which calls _doSync()
}

export function absSeek(globalTime) {
  const ap = S.absPlayer;
  globalTime = Math.max(0, Math.min(globalTime, ap.duration || Infinity));
  ap.currentTime = globalTime;
  if (ap.audioTracks.length) {
    const { idx, local } = _findTrack(globalTime);
    if (idx !== ap.trackIdx) {
      _loadTrack(idx, local);
      if (ap.playing) _audio.play().catch(() => {});
    } else {
      _audio.currentTime = local;
    }
  } else {
    _getAudio().currentTime = globalTime;
  }
  _renderProgress();
}

export function absSkipSecs(secs) { absSeek(S.absPlayer.currentTime + secs); }

export function absNextChapter() {
  const ap = S.absPlayer;
  const next = ap.chapters[ap.chapterIdx + 1];
  if (next) absSeek(next.start);
}

export function absPrevChapter() {
  const ap = S.absPlayer;
  const cur = ap.chapters[ap.chapterIdx];
  if (cur && ap.currentTime - cur.start > 5) { absSeek(cur.start); return; }
  const prev = ap.chapters[ap.chapterIdx - 1];
  if (prev) absSeek(prev.start);
}

export function absSetSpeed(speed) {
  S.absPlayer.speed = speed;
  if (_audio) _audio.playbackRate = speed;
  document.querySelectorAll('#abs-speed-picker button').forEach(b =>
    b.classList.toggle('active', parseFloat(b.dataset.speed) === speed));
  const lbl = document.getElementById('abs-speed-val');
  if (lbl) lbl.textContent = `${speed}×`;
  document.getElementById('abs-speed-picker')?.classList.remove('open');
}

export function absSleepIn(minutes) {
  clearTimeout(_sleepTimer); clearInterval(_sleepTick);
  _sleepTimer = null; _sleepTick = null; _sleepEndTime = null;
  document.getElementById('abs-sleep-picker')?.classList.remove('open');
  if (!minutes) { S.absPlayer.sleepRemaining = null; _renderSleepBtn(); return; }
  _sleepEndTime = Date.now() + minutes * 60_000;
  _updateSleepTick();
  _sleepTimer = setTimeout(() => {
    _getAudio().pause();
    S.absPlayer.sleepRemaining = null; _sleepEndTime = null;
    clearInterval(_sleepTick); _sleepTick = null;
    _renderSleepBtn();
    toast('😴 Sleep Timer: Pause');
  }, minutes * 60_000);
  _sleepTick = setInterval(_updateSleepTick, 1000);
  _renderSleepBtn();
}

function _updateSleepTick() {
  if (!_sleepEndTime) return;
  S.absPlayer.sleepRemaining = Math.max(0, Math.round((_sleepEndTime - Date.now()) / 1000));
  _renderSleepBtn();
}

// ─── OVERLAY ───
export function absOpenPlayer() {
  S.absPlayer.open = true;
  document.getElementById('abs-player')?.classList.add('open');
}
export function absClosePlayer() {
  S.absPlayer.open = false;
  document.getElementById('abs-player')?.classList.remove('open');
}

export function absToggleChapters() {
  if (_playlistMode) return;
  document.getElementById('abs-chapter-list')?.classList.toggle('open');
  _renderChapterList();
}

export function absToggleSpeedPicker() {
  document.getElementById('abs-sleep-picker')?.classList.remove('open');
  document.getElementById('abs-speed-picker')?.classList.toggle('open');
}

export function absToggleSleepPicker() {
  document.getElementById('abs-speed-picker')?.classList.remove('open');
  document.getElementById('abs-sleep-picker')?.classList.toggle('open');
}

export function absSeekToChapter(idx) {
  const ch = S.absPlayer.chapters[idx];
  if (ch) absSeek(ch.start);
}

// ─── PLAYLIST MODE ───
let _playlistMode = localStorage.getItem('ns_abs_pl_mode') === '1';

export function absTogglePlaylistMode() {
  _playlistMode = !_playlistMode;
  localStorage.setItem('ns_abs_pl_mode', _playlistMode ? '1' : '0');
  _applyPlaylistMode();
}

function _applyPlaylistMode() {
  const overlay = document.getElementById('abs-player');
  overlay?.classList.toggle('playlist-mode', _playlistMode);
  document.getElementById('abs-playlist-btn')?.classList.toggle('active', _playlistMode);
  const cl = document.getElementById('abs-chapter-list');
  if (!cl) return;
  if (_playlistMode) {
    cl.classList.add('open');
    _renderChapterList();
    setTimeout(() => cl.querySelector('.abs-ch-item.active')?.scrollIntoView({ block: 'nearest', behavior: 'smooth' }), 50);
  } else {
    cl.classList.remove('open');
  }
}

// ─── PROGRESS SCRUB ───
let _scrubbing = false;
export function absProgDown(e) { _scrubbing = true; _scrub(e); }
export function absProgMove(e) { if (_scrubbing) _scrub(e); }
export function absProgUp(e) { if (_scrubbing) { _scrubbing = false; _scrub(e); } }
function _scrub(e) {
  const bar = document.getElementById('abs-prog-bar');
  if (!bar) return;
  const rect = bar.getBoundingClientRect();
  const x = (e.touches?.[0]?.clientX ?? e.clientX) - rect.left;
  absSeek((Math.max(0, Math.min(1, x / rect.width))) * S.absPlayer.duration);
}

// ─── RENDER HELPERS ───
function _renderMiniBar() {
  const ap = S.absPlayer;
  const bar = document.getElementById('abs-mini-bar');
  if (!bar) return;
  if (!ap.item) { bar.classList.remove('visible'); return; }
  bar.classList.add('visible');
  const meta = ap.item?.media?.metadata || {};
  const cover = absCoverUrl(ap.item?.id);
  const coverEl = document.getElementById('abs-mini-cover');
  if (coverEl) {
    coverEl.innerHTML = cover
      ? `<img src="${cover}" alt="" style="width:100%;height:100%;object-fit:cover;border-radius:6px" onerror="this.style.display='none'">`
      : '📚';
  }
  const titleEl = document.getElementById('abs-mini-title');
  if (titleEl) titleEl.textContent = meta.title || 'Unbekannt';
  const ch = ap.chapters[ap.chapterIdx];
  const chEl = document.getElementById('abs-mini-chapter');
  if (chEl) chEl.textContent = ch?.title || meta.authorName || '';
  const playBtn = document.getElementById('abs-mini-play');
  if (playBtn) {
    playBtn.innerHTML = ap.playing
      ? `<svg width="22" height="22" viewBox="0 0 24 24" fill="currentColor"><rect x="6" y="4" width="4" height="16" rx="1"/><rect x="14" y="4" width="4" height="16" rx="1"/></svg>`
      : `<svg width="22" height="22" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>`;
  }
}

function _fmt(secs) {
  if (!isFinite(secs) || secs < 0) secs = 0;
  const h = Math.floor(secs / 3600);
  const m = Math.floor((secs % 3600) / 60);
  const s = Math.floor(secs % 60);
  return h > 0
    ? `${h}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`
    : `${m}:${String(s).padStart(2, '0')}`;
}

function _renderPlayer() {
  const ap = S.absPlayer;
  const meta = ap.item?.media?.metadata || {};
  const cover = absCoverUrl(ap.item?.id);
  const el = document.getElementById('abs-player');
  if (!el) return;
  const img = el.querySelector('#abs-cover');
  if (img) { img.src = cover || ''; img.style.display = cover ? '' : 'none'; }
  const pl = el.querySelector('#abs-cover-placeholder');
  if (pl) pl.style.display = cover ? 'none' : 'flex';
  el.querySelector('#abs-title').textContent  = meta.title      || 'Unbekannt';
  el.querySelector('#abs-author').textContent = meta.authorName || '';
  _renderProgress();
  _renderControls();
  _renderChapterName();
  _renderSleepBtn();
  _renderMiniBar();
  _applyPlaylistMode();
}

function _renderProgress() {
  const ap = S.absPlayer;
  const pct = ap.duration > 0 ? (ap.currentTime / ap.duration) * 100 : 0;
  const fill = document.getElementById('abs-prog-fill');
  const thumb = document.getElementById('abs-prog-thumb');
  if (fill)  fill.style.width  = `${Math.min(100, pct)}%`;
  if (thumb) thumb.style.left  = `${Math.min(100, pct)}%`;
  const cur = document.getElementById('abs-time-cur');
  const rem = document.getElementById('abs-time-rem');
  if (cur) cur.textContent = _fmt(ap.currentTime);
  if (rem) rem.textContent = `-${_fmt(ap.duration - ap.currentTime)}`;
}

function _renderControls() {
  const ap = S.absPlayer;
  const btn = document.getElementById('abs-playpause-btn');
  if (!btn) return;
  btn.innerHTML = ap.playing
    ? `<svg width="28" height="28" viewBox="0 0 24 24" fill="currentColor"><rect x="6" y="4" width="4" height="16" rx="1"/><rect x="14" y="4" width="4" height="16" rx="1"/></svg>`
    : `<svg width="28" height="28" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>`;
  const sv = document.getElementById('abs-speed-val');
  if (sv) sv.textContent = `${ap.speed}×`;
  _renderMiniBar();
}

function _renderChapterName() {
  const ch = S.absPlayer.chapters[S.absPlayer.chapterIdx];
  const el = document.getElementById('abs-chapter-name');
  if (el) el.textContent = ch?.title || '';
  _renderMiniBar();
}

function _renderChapterList() {
  const ap = S.absPlayer;
  const el = document.getElementById('abs-chapter-list');
  if (!el || !el.classList.contains('open')) return;
  el.innerHTML = ap.chapters.map((ch, i) => `
    <div class="abs-ch-item${i === ap.chapterIdx ? ' active' : ''}" onclick="absSeekToChapter(${i})">
      <span class="abs-ch-num">${i + 1}</span>
      <span class="abs-ch-title">${esc(ch.title || `Kapitel ${i + 1}`)}</span>
      <span class="abs-ch-start">${_fmt(ch.start)}</span>
    </div>`).join('');
}

function _renderSleepBtn() {
  const btn = document.getElementById('abs-sleep-btn');
  if (!btn) return;
  const rem = S.absPlayer.sleepRemaining;
  const moonSvg = `<svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2"><path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z"/></svg>`;
  if (rem != null) {
    const m = Math.floor(rem / 60), s = String(rem % 60).padStart(2, '0');
    btn.innerHTML = `${moonSvg}<span>${m}:${s}</span>`;
    btn.classList.add('active');
  } else {
    btn.innerHTML = moonSvg;
    btn.classList.remove('active');
  }
}

// ─── BOOKS VIEW ───
export async function loadAbsBooks(libId, search = '') {
  const grid = document.getElementById('abs-books-grid');
  if (!grid) return;
  grid.innerHTML = '<div class="abs-loading">Lade Bücher…</div>';
  try {
    const { items } = await absGetItems(libId, { search });
    if (!items.length) {
      grid.innerHTML = '<p class="abs-empty">Keine Bücher gefunden.</p>';
      return;
    }
    grid.innerHTML = items.map(item => {
      const meta = item.media?.metadata || {};
      const cover = absCoverUrl(item.id);
      const prog  = item.userMediaProgress;
      const pct   = prog ? Math.round((prog.progress ?? 0) * 100) : 0;
      return `
        <div class="abs-book-card" onclick="absOpenBook('${item.id}')">
          <div class="abs-book-cover-wrap">
            ${cover
              ? `<img src="${cover}" class="abs-book-cover" loading="lazy" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">`
              : ''}
            <div class="abs-book-cover-ph" style="display:${cover ? 'none' : 'flex'}">📚</div>
            ${pct > 0 && pct < 99 ? `<div class="abs-book-prog-wrap"><div class="abs-book-prog-fill" style="width:${pct}%"></div></div>` : ''}
            ${pct >= 99 ? '<div class="abs-book-done">✓</div>' : ''}
          </div>
          <div class="abs-book-title">${esc(meta.title || 'Unbekannt')}</div>
          <div class="abs-book-author">${esc(meta.authorName || '')}</div>
        </div>`;
    }).join('');
  } catch (e) {
    grid.innerHTML = `<p class="abs-error">Fehler: ${esc(e.message)}</p>`;
  }
}

export function absOpenBook(itemId) {
  const { navigate } = window;
  navigate('abs-book-detail', { id: itemId });
}

export async function loadAbsBookDetail(itemId) {
  const el = document.getElementById('abs-book-detail-content');
  if (!el) return;
  el.innerHTML = '<div class="abs-loading">Lade Buch…</div>';
  try {
    const [item, prog] = await Promise.all([absGetItem(itemId), absGetProgress(itemId)]);
    window._absCurrentItem = item;
    const meta     = item.media?.metadata || {};
    const cover    = absCoverUrl(item.id);
    const chapters = item.media?.chapters || [];
    const duration = item.media?.duration ?? 0;
    const curTime  = prog?.currentTime ?? 0;
    const pct      = duration > 0 ? Math.round((curTime / duration) * 100) : 0;

    el.innerHTML = `
      <div class="abs-detail-header">
        <div class="abs-detail-cover-wrap">
          ${cover
            ? `<img src="${cover}" class="abs-detail-cover" onerror="this.style.display='none';this.nextElementSibling.style.display='flex'">`
            : ''}
          <div class="abs-detail-cover-ph" style="display:${cover ? 'none' : 'flex'}">📚</div>
        </div>
        <div class="abs-detail-meta">
          <h2 class="abs-detail-title">${esc(meta.title || 'Unbekannt')}</h2>
          <div class="abs-detail-author">${esc(meta.authorName || '')}</div>
          ${meta.seriesName ? `<div class="abs-detail-series">${esc(meta.seriesName)}</div>` : ''}
          ${meta.publishedYear ? `<div class="abs-detail-year">${esc(String(meta.publishedYear))}</div>` : ''}
          ${duration ? `<div class="abs-detail-dur">${_fmt(duration)}</div>` : ''}
          ${pct > 0 ? `
            <div class="abs-detail-progress-wrap">
              <div class="abs-detail-progress-bar"><div style="width:${pct}%"></div></div>
              <span>${pct}% gehört</span>
            </div>` : ''}
          <button class="abs-play-btn" onclick="absPlayItem(window._absCurrentItem)">
            <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor"><polygon points="5 3 19 12 5 21 5 3"/></svg>
            ${curTime > 60 ? 'Weiterhören' : 'Abspielen'}
          </button>
        </div>
      </div>
      ${meta.description ? `<div class="abs-detail-desc">${esc(meta.description)}</div>` : ''}
      ${chapters.length ? `
        <div class="abs-detail-chapters">
          <h3 class="abs-detail-chapters-title">Kapitel <span class="abs-ch-count">${chapters.length}</span></h3>
          ${chapters.map((ch, i) => `
            <div class="abs-chapter-row" onclick="absPlayChapter(${ch.start})">
              <span class="abs-ch-num">${i + 1}</span>
              <span class="abs-ch-title">${esc(ch.title || `Kapitel ${i + 1}`)}</span>
              <span class="abs-ch-start">${_fmt(ch.start)}</span>
            </div>`).join('')}
        </div>` : ''}`;
  } catch (e) {
    el.innerHTML = `<p class="abs-error">Fehler: ${esc(e.message)}</p>`;
  }
}

export function absPlayChapter(startTime) {
  if (!window._absCurrentItem) return;
  absPlayItem(window._absCurrentItem).then(() => {
    // Give audio time to load then seek
    setTimeout(() => absSeek(startTime), 800);
  });
}

// ─── SETTINGS ───
export function absInitFromStorage() {
  try {
    const d = JSON.parse(localStorage.getItem('ns_abs') || 'null');
    if (d?.url && d?.token) {
      S.abs.url    = d.url;
      S.abs.token  = d.token;
      S.abs.userId = d.userId || null;
      S.abs.currentLibraryId = d.libId || null;
    }
  } catch {}
}

function absSaveToStorage() {
  localStorage.setItem('ns_abs', JSON.stringify({
    url: S.abs.url, token: S.abs.token,
    userId: S.abs.userId, libId: S.abs.currentLibraryId,
  }));
}

function _showAbsNavItem(show) {
  document.getElementById('nav-abs-section')?.style && (document.getElementById('nav-abs-section').style.display = show ? '' : 'none');
  const bnav = document.getElementById('bnav-audiobooks');
  if (bnav) bnav.style.display = show ? '' : 'none';
}

export function absOpenSettings() {
  const urlEl = document.getElementById('abs-s-url');
  if (urlEl) urlEl.value = S.abs.url || '';
  // Never pre-fill the API key field for security — just show connection status
  const statusEl = document.getElementById('abs-s-status');
  if (statusEl) statusEl.textContent = S.abs.token ? '✅ Verbunden' : '';
}

export async function absConnectSettings() {
  const url    = document.getElementById('abs-s-url')?.value.trim().replace(/\/$/, '');
  const apiKey = document.getElementById('abs-s-apikey')?.value.trim();
  if (!url || !apiKey) { toast('❌ URL und API Key ausfüllen'); return; }
  const btn = document.getElementById('abs-s-connect-btn');
  if (btn) { btn.disabled = true; btn.textContent = 'Verbinde…'; }
  try {
    await absVerifyApiKey(url, apiKey);
    const libs = await absGetLibraries();
    if (!S.abs.currentLibraryId) S.abs.currentLibraryId = libs[0]?.id || null;
    absSaveToStorage();
    _renderLibPicker(libs);
    _showAbsNavItem(true);
    toast('✅ Audiobookshelf verbunden');
    const statusEl = document.getElementById('abs-s-status');
    if (statusEl) statusEl.textContent = '✅ Verbunden';
  } catch (e) {
    S.abs.token = null;
    toast(`❌ ABS Verbindung fehlgeschlagen: ${e.message}`);
  } finally {
    if (btn) { btn.disabled = false; btn.textContent = 'Verbinden'; }
  }
}

function _renderLibPicker(libs) {
  const wrap = document.getElementById('abs-lib-picker');
  if (!wrap) return;
  wrap.style.display = libs.length > 1 ? '' : 'none';
  const sel = wrap.querySelector('select');
  if (sel) {
    sel.innerHTML = libs.map(l =>
      `<option value="${esc(l.id)}"${l.id === S.abs.currentLibraryId ? ' selected' : ''}>${esc(l.name)}</option>`
    ).join('');
  }
}

export function absSetLibrary(libId) {
  S.abs.currentLibraryId = libId;
  absSaveToStorage();
}

export async function absLoadSettingsLibraries() {
  if (!S.abs.token) return;
  try {
    const libs = await absGetLibraries();
    _renderLibPicker(libs);
  } catch {}
}

export function absDisconnect() {
  S.abs.url = ''; S.abs.token = null;
  S.abs.userId = null; S.abs.currentLibraryId = null;
  localStorage.removeItem('ns_abs');
  _showAbsNavItem(false);
  toast('Audiobookshelf getrennt');
  const statusEl = document.getElementById('abs-s-status');
  if (statusEl) statusEl.textContent = '';
}