const PLAYLIST_LIST_API = '/api/zen_box/playlists';
const PLAYLIST_STORAGE_KEY = 'zen_box_selected_playlist';
const RESUME_PLAYBACK_STORAGE_KEY = 'zen_box_resume_playback_enabled';
const PLAYBACK_POSITION_KEY_PREFIX = 'zen_box_playback_position';

let PLAYLIST = [];
let playlistFiles = [];
let currentPlaylistFile = 'playlist.json';
let cachedTrackUrls = new Set();
let currentIdx = 0;
let isPlaying = false;
let isSeeking = false;
let repeatMode = 0;
let shuffleOn = false;
let shuffleOrder = [];
let sheetOpen = false;
let settingsOpen = false;
let volumeVisible = false;
let resumePlaybackEnabled = true;
let lastSavedPositionSeconds = 0;

const audio = document.getElementById('audio');

async function init() {
  resumePlaybackEnabled = getResumePlaybackEnabled();
  bindSettingsEvents();
  registerSW();
  await loadPlaylistFiles();
  await restorePlaylistSelection();
  setupMediaSession();
  window.addEventListener('resize', refreshMarqueeState);
}

async function loadPlaylistFiles() {
  try {
    const response = await fetch(PLAYLIST_LIST_API, { cache: 'no-store' });
    const data = await response.json();
    if (data && data.ok && Array.isArray(data.playlists) && data.playlists.length) {
      playlistFiles = data.playlists.map(item => String(item || '')).filter(Boolean);
    } else {
      playlistFiles = ['playlist.json'];
    }
  } catch (error) {
    console.warn('Failed to load playlist files:', error);
    playlistFiles = ['playlist.json'];
  }
  if (!playlistFiles.includes('playlist.json')) playlistFiles.unshift('playlist.json');
}

async function restorePlaylistSelection() {
  const saved = getSavedPlaylistFile();
  const target = playlistFiles.includes(saved) ? saved : 'playlist.json';
  await switchPlaylist(target, { silent: true });
}

function getSavedPlaylistFile() {
  try {
    return String(localStorage.getItem(PLAYLIST_STORAGE_KEY) || 'playlist.json') || 'playlist.json';
  } catch {
    return 'playlist.json';
  }
}

function savePlaylistFile(fileName) {
  try {
    localStorage.setItem(PLAYLIST_STORAGE_KEY, fileName);
  } catch {}
}

function getResumePlaybackEnabled() {
  try {
    const value = localStorage.getItem(RESUME_PLAYBACK_STORAGE_KEY);
    if (value === null) return true;
    return value === '1';
  } catch {
    return true;
  }
}

function saveResumePlaybackEnabled(enabled) {
  resumePlaybackEnabled = !!enabled;
  try {
    localStorage.setItem(RESUME_PLAYBACK_STORAGE_KEY, enabled ? '1' : '0');
  } catch {}
}

function getPlaybackPositionKey(trackSrc) {
  return `${PLAYBACK_POSITION_KEY_PREFIX}:${currentPlaylistFile}::${normalizeTrackSrc(trackSrc)}`;
}

function getSavedPlaybackPosition(trackSrc) {
  try {
    const value = localStorage.getItem(getPlaybackPositionKey(trackSrc));
    const seconds = Number(value || 0);
    return Number.isFinite(seconds) && seconds > 0 ? seconds : 0;
  } catch {
    return 0;
  }
}

function clearSavedPlaybackPosition(trackSrc) {
  try {
    localStorage.removeItem(getPlaybackPositionKey(trackSrc));
  } catch {}
}

function saveCurrentPlaybackPosition({ force = false, explicitPosition = null, explicitDuration = null } = {}) {
  if (!resumePlaybackEnabled) return;
  const track = PLAYLIST[currentIdx];
  if (!track || !track.src) return;

  const currentTime = explicitPosition === null ? audio.currentTime : explicitPosition;
  const duration = explicitDuration === null ? audio.duration : explicitDuration;
  const safeSeconds = Math.max(0, Math.floor(Number(currentTime) || 0));
  const safeDuration = Math.max(0, Math.floor(Number(duration) || 0));
  const nearEnd = safeDuration > 0 && safeDuration - safeSeconds <= 30;

  if (safeSeconds < 5 || nearEnd) {
    clearSavedPlaybackPosition(track.src);
    lastSavedPositionSeconds = 0;
    return;
  }

  if (!force && Math.abs(safeSeconds - lastSavedPositionSeconds) < 15) {
    return;
  }

  try {
    localStorage.setItem(getPlaybackPositionKey(track.src), String(safeSeconds));
    lastSavedPositionSeconds = safeSeconds;
  } catch {}
}

function getPlaylistRequestPath(fileName) {
  return encodeURIComponent(String(fileName || 'playlist.json'));
}

async function fetchPlaylistData(fileName) {
  const response = await fetch(getPlaylistRequestPath(fileName), { cache: 'no-store' });
  if (!response.ok) throw new Error(`playlist_http_${response.status}`);
  const data = await response.json();
  return Array.isArray(data) ? data : [];
}

async function switchPlaylist(fileName, { silent = false } = {}) {
  const target = String(fileName || 'playlist.json');
  const fallback = playlistFiles.includes(target) ? target : 'playlist.json';
  const previousFile = currentPlaylistFile;
  const previousSrc = PLAYLIST[currentIdx] ? normalizeTrackSrc(PLAYLIST[currentIdx].src) : '';
  const wasPlaying = isPlaying;
  const playlistSelect = document.getElementById('playlistSelect');
  if (playlistSelect) playlistSelect.disabled = true;
  saveCurrentPlaybackPosition({ force: true });
  pauseAudio();
  try {
    const nextPlaylist = await fetchPlaylistData(fallback);
    currentPlaylistFile = fallback;
    savePlaylistFile(fallback);
    PLAYLIST = nextPlaylist.map(track => ({ ...track, isCached: false }));
    await refreshCacheState();
    const matchedIdx = previousSrc ? PLAYLIST.findIndex(track => normalizeTrackSrc(track.src) === previousSrc) : -1;
    currentIdx = matchedIdx >= 0 ? matchedIdx : 0;
    updateTrackCount();
    buildShuffleOrder();
    renderSettings();
    renderPlaylist();
    if (PLAYLIST.length > 0) {
      loadTrack(currentIdx, false);
      if (wasPlaying && matchedIdx >= 0) playAudio();
    } else {
      resetTrackInfo();
    }
    closeSheet();
    if (!silent) showToast(`已切换歌单：${fallback}`);
  } catch (error) {
    currentPlaylistFile = previousFile || 'playlist.json';
    renderSettings();
    console.warn('Failed to switch playlist:', error);
    if (!silent) showToast('歌单切换失败');
  } finally {
    if (playlistSelect) playlistSelect.disabled = false;
  }
}

async function refreshCacheState() {
  cachedTrackUrls = await collectCachedTrackUrls();
  PLAYLIST = PLAYLIST.map(track => ({
    ...track,
    isCached: cachedTrackUrls.has(normalizeTrackSrc(track.src))
  }));
  updateCacheSummary();
}

async function collectCachedTrackUrls() {
  const result = new Set();
  if (!('caches' in window)) return result;
  try {
    const cacheNames = await caches.keys();
    for (const cacheName of cacheNames) {
      const cache = await caches.open(cacheName);
      const requests = await cache.keys();
      requests.forEach(request => {
        const url = normalizeTrackSrc(request && request.url ? request.url : '');
        if (isAudioCacheUrl(url)) result.add(url);
      });
    }
  } catch (error) {
    console.warn('Failed to inspect cache storage:', error);
  }
  return result;
}

function isAudioCacheUrl(url) {
  return !!url && (url.includes('.mp3') || url.includes('oss'));
}

function normalizeTrackSrc(src) {
  try {
    const url = new URL(String(src || ''), window.location.href);
    url.hash = '';
    return url.href;
  } catch {
    return String(src || '').trim();
  }
}

function updateTrackCount() {
  const countText = `${PLAYLIST.length} 首`;
  document.getElementById('trackCount').textContent = countText;
}

function setMarqueeText(host, text) {
  if (!host) return;
  const content = String(text || '');
  const primary = host.querySelector('.marquee-copy-primary');
  const duplicate = host.querySelector('.marquee-copy-duplicate');
  if (primary) primary.textContent = content;
  if (duplicate) duplicate.textContent = content;
}

function refreshMarqueeHost(host, enabled) {
  if (!host) return;
  const primary = host.querySelector('.marquee-copy-primary');
  const duplicate = host.querySelector('.marquee-copy-duplicate');
  if (!primary || !duplicate) return;
  const overflow = primary.scrollWidth > host.clientWidth + 6;
  if (!enabled || !overflow) {
    host.classList.remove('marquee-active');
    host.style.removeProperty('--marquee-distance');
    host.style.removeProperty('--marquee-duration');
    return;
  }
  const distance = Math.ceil(primary.scrollWidth + 42);
  const duration = Math.max(10, Math.round(distance / 24));
  host.style.setProperty('--marquee-distance', `${distance}px`);
  host.style.setProperty('--marquee-duration', `${duration}s`);
  host.classList.add('marquee-active');
}

function refreshCurrentTrackMarquee() {
  const host = document.getElementById('trackTitleHost');
  refreshMarqueeHost(host, !!PLAYLIST[currentIdx]);
}

function refreshPlaylistMarquee() {
  document.querySelectorAll('.playlist-item .marquee-host').forEach(host => {
    const item = host.closest('.playlist-item');
    refreshMarqueeHost(host, !!(item && item.classList.contains('active')));
  });
}

function refreshMarqueeState() {
  refreshCurrentTrackMarquee();
  refreshPlaylistMarquee();
}

function resetTrackInfo() {
  audio.removeAttribute('src');
  audio.load();
  setMarqueeText(document.getElementById('trackTitleHost'), '尚未选择曲目');
  document.getElementById('trackArtist').textContent = currentPlaylistFile || '—';
  document.getElementById('timeCurrent').textContent = '0:00';
  document.getElementById('timeTotal').textContent = '0:00';
  document.getElementById('progressBar').value = 0;
  updateSliderFill(document.getElementById('progressBar'), 0);
  updatePlaylistHighlight();
  refreshCurrentTrackMarquee();
}

function renderSettings() {
  const select = document.getElementById('playlistSelect');
  if (select) {
    select.innerHTML = '';
    playlistFiles.forEach(file => {
      const option = document.createElement('option');
      option.value = file;
      option.textContent = file;
      if (file === currentPlaylistFile) option.selected = true;
      select.appendChild(option);
    });
    select.value = currentPlaylistFile;
  }
  const resumeToggle = document.getElementById('resumePlaybackToggle');
  if (resumeToggle) {
    resumeToggle.checked = !!resumePlaybackEnabled;
  }
  updateCacheSummary();
}

function updateCacheSummary() {
  const summary = document.getElementById('cacheSummary');
  if (!summary) return;
  const cachedCount = PLAYLIST.filter(track => !!track.isCached).length;
  summary.textContent = PLAYLIST.length
    ? `已缓存 ${cachedCount} / ${PLAYLIST.length} 首`
    : '当前歌单暂无曲目';
}

function bindSettingsEvents() {
  const panel = document.getElementById('settingsPanel');
  if (panel) {
    panel.addEventListener('click', event => event.stopPropagation());
  }
  const select = document.getElementById('playlistSelect');
  if (select) {
    select.addEventListener('change', async event => {
      const nextFile = String(event.target && event.target.value || 'playlist.json');
      await switchPlaylist(nextFile);
    });
  }
  const resumeToggle = document.getElementById('resumePlaybackToggle');
  if (resumeToggle) {
    resumeToggle.addEventListener('change', event => {
      const enabled = !!(event.target && event.target.checked);
      saveResumePlaybackEnabled(enabled);
      renderSettings();
      showToast(enabled ? '已开启断点续播' : '已关闭断点续播');
    });
  }
}

function openSettings() {
  settingsOpen = true;
  renderSettings();
  document.getElementById('settingsOverlay').classList.add('open');
  document.getElementById('settingsPanel').classList.add('open');
}

function closeSettings() {
  settingsOpen = false;
  document.getElementById('settingsOverlay').classList.remove('open');
  document.getElementById('settingsPanel').classList.remove('open');
}

function loadTrack(idx, autoplay) {
  if (PLAYLIST[currentIdx] && audio.src) {
    saveCurrentPlaybackPosition({ force: true });
  }
  currentIdx = idx;
  const track = PLAYLIST[idx];
  if (!track) return;
  const savedPosition = resumePlaybackEnabled ? getSavedPlaybackPosition(track.src) : 0;
  audio.src = track.src;
  audio.dataset.resumePosition = savedPosition > 5 ? String(savedPosition) : '0';
  audio.load();
  setMarqueeText(document.getElementById('trackTitleHost'), track.title || '未知曲目');
  document.getElementById('trackArtist').textContent = track.artist || '未知歌手';
  document.getElementById('timeCurrent').textContent = '0:00';
  document.getElementById('timeTotal').textContent = '0:00';
  document.getElementById('progressBar').value = 0;
  updateSliderFill(document.getElementById('progressBar'), 0);
  updatePlaylistHighlight();
  updateMediaSessionMetadata();
  refreshCurrentTrackMarquee();
  lastSavedPositionSeconds = savedPosition > 5 ? Math.floor(savedPosition) : 0;
  if (autoplay) playAudio();
}

function togglePlay() {
  if (!PLAYLIST.length) {
    showToast('播放列表为空');
    return;
  }
  if (!audio.src || audio.src === location.href) {
    loadTrack(0, true);
    return;
  }
  isPlaying ? pauseAudio() : playAudio();
}

function playAudio() {
  audio.play().then(() => {
    isPlaying = true;
    updatePlayUI(true);
  }).catch(error => {
    console.warn('Play failed', error);
    showToast('播放失败，请检查音频地址');
  });
}

function pauseAudio() {
  audio.pause();
  isPlaying = false;
  updatePlayUI(false);
}

function updatePlayUI(playing) {
  document.getElementById('iconPlay').style.display = playing ? 'none' : 'block';
  document.getElementById('iconPause').style.display = playing ? 'block' : 'none';
  const glow = document.getElementById('zenGlow');
  glow.classList.toggle('active', playing);
  for (let i = 0; i < 3; i += 1) {
    document.getElementById(`zenWave${i}`).classList.toggle('active', playing);
  }
  if ('mediaSession' in navigator) {
    navigator.mediaSession.playbackState = playing ? 'playing' : 'paused';
  }
  updatePlaylistHighlight();
}

function nextTrack() {
  if (!PLAYLIST.length) return;
  if (repeatMode === 1) {
    audio.currentTime = 0;
    if (isPlaying) playAudio();
    return;
  }
  let next;
  if (shuffleOn) {
    const pos = shuffleOrder.indexOf(currentIdx);
    next = shuffleOrder[(pos + 1) % shuffleOrder.length];
  } else {
    next = (currentIdx + 1) % PLAYLIST.length;
  }
  loadTrack(next, isPlaying);
}

function prevTrack() {
  if (!PLAYLIST.length) return;
  if (audio.currentTime > 3) {
    audio.currentTime = 0;
    return;
  }
  let prev;
  if (shuffleOn) {
    const pos = shuffleOrder.indexOf(currentIdx);
    prev = shuffleOrder[(pos - 1 + shuffleOrder.length) % shuffleOrder.length];
  } else {
    prev = (currentIdx - 1 + PLAYLIST.length) % PLAYLIST.length;
  }
  loadTrack(prev, isPlaying);
}

function buildShuffleOrder() {
  shuffleOrder = [...Array(PLAYLIST.length).keys()];
  for (let i = shuffleOrder.length - 1; i > 0; i -= 1) {
    const j = Math.floor(Math.random() * (i + 1));
    [shuffleOrder[i], shuffleOrder[j]] = [shuffleOrder[j], shuffleOrder[i]];
  }
}

function toggleShuffle() {
  shuffleOn = !shuffleOn;
  if (shuffleOn) buildShuffleOrder();
  document.getElementById('btnShuffle').classList.toggle('active-mode', shuffleOn);
  showToast(shuffleOn ? '随机播放 开' : '随机播放 关');
}

const repeatLabels = ['顺序播放', '单曲循环', '列表循环'];
function cycleRepeat() {
  repeatMode = (repeatMode + 1) % 3;
  const btn = document.getElementById('btnRepeat');
  btn.classList.toggle('active-mode', repeatMode > 0);
  btn.innerHTML = repeatMode === 1
    ? '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="17 1 21 5 17 9"/><path d="M3 11V9a4 4 0 0 1 4-4h14"/><polyline points="7 23 3 19 7 15"/><path d="M21 13v2a4 4 0 0 1-4 4H3"/><text x="11" y="14" font-size="6" fill="currentColor" stroke="none" text-anchor="middle">1</text></svg>'
    : '<svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="17 1 21 5 17 9"/><path d="M3 11V9a4 4 0 0 1 4-4h14"/><polyline points="7 23 3 19 7 15"/><path d="M21 13v2a4 4 0 0 1-4 4H3"/></svg>';
  showToast(repeatLabels[repeatMode]);
}

function toggleVolume() {
  volumeVisible = !volumeVisible;
  showToast(volumeVisible ? '请用 iPhone 侧面音量键调节' : '');
}

function onProgressInput(val) {
  isSeeking = true;
  updateSliderFill(document.getElementById('progressBar'), val);
}

function onProgressChange(val) {
  if (audio.duration) audio.currentTime = (val / 100) * audio.duration;
  isSeeking = false;
  saveCurrentPlaybackPosition({ force: true });
}

function updateSliderFill(el, pct) {
  el.style.background = `linear-gradient(to right, #e8b86d 0%, #e8b86d ${pct}%, rgba(255,255,255,0.10) ${pct}%, rgba(255,255,255,0.10) 100%)`;
}

function fmtTime(seconds) {
  if (isNaN(seconds) || seconds < 0) return '0:00';
  const minutes = Math.floor(seconds / 60);
  const remain = Math.floor(seconds % 60);
  return `${minutes}:${String(remain).padStart(2, '0')}`;
}

audio.addEventListener('timeupdate', () => {
  if (isSeeking) return;
  const pct = audio.duration ? (audio.currentTime / audio.duration) * 100 : 0;
  document.getElementById('progressBar').value = pct;
  updateSliderFill(document.getElementById('progressBar'), pct);
  document.getElementById('timeCurrent').textContent = fmtTime(audio.currentTime);
  if ('mediaSession' in navigator && audio.duration) {
    try {
      navigator.mediaSession.setPositionState({
        duration: audio.duration,
        playbackRate: audio.playbackRate,
        position: audio.currentTime
      });
    } catch {}
  }
  if (isPlaying) {
    saveCurrentPlaybackPosition();
  }
});

audio.addEventListener('loadedmetadata', () => {
  const resumeSeconds = Number(audio.dataset.resumePosition || '0');
  if (resumePlaybackEnabled && resumeSeconds > 5 && audio.duration && resumeSeconds < Math.max(audio.duration - 30, 5)) {
    audio.currentTime = resumeSeconds;
    lastSavedPositionSeconds = Math.floor(resumeSeconds);
  } else {
    lastSavedPositionSeconds = 0;
  }
  audio.dataset.resumePosition = '0';
  document.getElementById('timeTotal').textContent = fmtTime(audio.duration);
});

audio.addEventListener('ended', () => {
  const track = PLAYLIST[currentIdx];
  if (track && track.src) {
    clearSavedPlaybackPosition(track.src);
  }
  lastSavedPositionSeconds = 0;
  isPlaying = false;
  updatePlayUI(false);
  if (repeatMode === 1) {
    audio.currentTime = 0;
    playAudio();
  } else {
    const isLast = !shuffleOn && currentIdx === PLAYLIST.length - 1;
    if (isLast && repeatMode === 0) return;
    nextTrack();
    playAudio();
  }
});

audio.addEventListener('play', () => {
  isPlaying = true;
  updatePlayUI(true);
});

audio.addEventListener('pause', () => {
  isPlaying = false;
  updatePlayUI(false);
  saveCurrentPlaybackPosition({ force: true });
});

audio.addEventListener('error', () => {
  isPlaying = false;
  updatePlayUI(false);
  const err = audio.error;
  let msg = '音频加载失败';
  if (err) {
    switch (err.code) {
      case MediaError.MEDIA_ERR_ABORTED: msg = '播放被中止'; break;
      case MediaError.MEDIA_ERR_NETWORK: msg = '网络错误，无法加载音频'; break;
      case MediaError.MEDIA_ERR_DECODE: msg = '音频解码失败'; break;
      case MediaError.MEDIA_ERR_SRC_NOT_SUPPORTED: msg = '音频地址无效或格式不支持'; break;
      default: break;
    }
  }
  console.warn('Audio error:', err, audio.src);
  showToast(msg);
});

function renderPlaylist() {
  const wrap = document.getElementById('sheetList');
  const empty = document.getElementById('emptyState');
  if (!PLAYLIST.length) {
    empty.style.display = 'block';
    wrap.querySelectorAll('.playlist-item').forEach(el => el.remove());
    return;
  }
  empty.style.display = 'none';
  wrap.querySelectorAll('.playlist-item').forEach(el => el.remove());
  PLAYLIST.forEach((track, index) => {
    const div = document.createElement('div');
    div.className = `playlist-item${index === currentIdx ? ' active' : ''}`;
    div.dataset.idx = index;
    div.innerHTML = `
      <div class="item-num" id="itemNum${index}">${index + 1}</div>
      <div class="item-info">
        <div class="item-title marquee-host">
          <div class="marquee-track">
            <span class="marquee-copy marquee-copy-primary">${escHtml(track.title || '未知曲目')}</span>
            <span class="marquee-gap" aria-hidden="true"></span>
            <span class="marquee-copy marquee-copy-duplicate" aria-hidden="true">${escHtml(track.title || '未知曲目')}</span>
          </div>
        </div>
        <div class="item-sub">${escHtml(track.artist || '未知歌手')}</div>
      </div>
      <div class="item-cache ${track.isCached ? 'cached' : 'pending'}">${track.isCached ? '已缓存' : '未缓存'}</div>
    `;
    div.addEventListener('click', () => {
      if (index === currentIdx) {
        togglePlay();
      } else {
        loadTrack(index, true);
        closeSheet();
      }
    });
    wrap.appendChild(div);
  });
  refreshPlaylistMarquee();
}

function updatePlaylistHighlight() {
  document.querySelectorAll('.playlist-item').forEach((el, index) => {
    el.classList.toggle('active', index === currentIdx);
    const num = document.getElementById(`itemNum${index}`);
    if (num) {
      num.textContent = (index === currentIdx && isPlaying) ? '▶' : (index + 1);
      num.className = `item-num${index === currentIdx ? ' playing-icon' : ''}`;
    }
  });
  refreshPlaylistMarquee();
}

function openSheet() {
  sheetOpen = true;
  document.getElementById('sheetOverlay').classList.add('open');
  const sheet = document.getElementById('sheet');
  sheet.classList.add('open');
  sheet.onclick = event => event.stopPropagation();
  updatePlaylistHighlight();
}

function closeSheet() {
  sheetOpen = false;
  document.getElementById('sheetOverlay').classList.remove('open');
  document.getElementById('sheet').classList.remove('open');
}

function setupMediaSession() {
  if (!('mediaSession' in navigator)) return;
  navigator.mediaSession.setActionHandler('play', () => playAudio());
  navigator.mediaSession.setActionHandler('pause', () => pauseAudio());
  navigator.mediaSession.setActionHandler('nexttrack', () => nextTrack());
  navigator.mediaSession.setActionHandler('previoustrack', () => prevTrack());
  navigator.mediaSession.setActionHandler('seekto', event => {
    if (event.seekTime !== undefined && audio.duration) {
      audio.currentTime = event.seekTime;
    }
  });
}

function updateMediaSessionMetadata() {
  if (!('mediaSession' in navigator)) return;
  const track = PLAYLIST[currentIdx];
  if (!track) return;
  navigator.mediaSession.metadata = new MediaMetadata({
    title: track.title || '未知曲目',
    artist: track.artist || '未知歌手',
    album: '八音盒',
    artwork: track.cover ? [{ src: track.cover, sizes: '512x512', type: 'image/jpeg' }] : []
  });
}

function registerSW() {
  if ('serviceWorker' in navigator) {
    navigator.serviceWorker.register('sw.js').catch(() => {});
  }
}

document.addEventListener('visibilitychange', () => {
  if (document.hidden) {
    saveCurrentPlaybackPosition({ force: true });
  }
});

window.addEventListener('beforeunload', () => {
  saveCurrentPlaybackPosition({ force: true });
});

function escHtml(s) {
  return String(s || '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
}

let toastTimer;
function showToast(msg) {
  const el = document.getElementById('toast');
  if (!msg) {
    el.classList.remove('show');
    el.textContent = '';
    return;
  }
  el.textContent = msg;
  el.classList.add('show');
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => el.classList.remove('show'), 1800);
}

init();
setTimeout(() => {
  updateSliderFill(document.getElementById('progressBar'), 0);
}, 50);