tts-voice-creator-clone-and-design-2/static/loader.js

(async function () {
  'use strict';

  // Hard safety net: never show skeleton longer than 8 s regardless of what
  // fails below. A partial UI beats an indefinite spinner.
  var _skTimeout = setTimeout(function () {
    var sk = document.getElementById('app-skeleton');
    if (sk) {
      sk.classList.add('sk-hidden');
      // Fully remove from DOM — otherwise the (display:none) skeleton still sits
      // in the document and earlier reveal logic would skip removal.
      setTimeout(function () { if (sk.parentNode) sk.parentNode.removeChild(sk); }, 300);
      document.querySelectorAll('.page-section').forEach(function (s) { s.style.display = ''; });
    }
  }, 8000);

  const SECTIONS = [
    's-voices', 's-clone', 's-design', 's-studio', 's-tryout', 's-rehearser',
    's-reader', 's-caststudio', 's-performance', 's-routing', 's-connect', 's-settings',
    's-llms', 's-conversation', 's-library', 's-magazine',
  ];

  function _storedSection() {
    try { return localStorage.getItem('ttsvc_section') || ''; } catch (_) { return ''; }
  }
  function _hashSection() {
    var raw = String(location.hash || '').replace(/^#/, '').trim();
    if (!raw) return '';
    if (raw.indexOf('section=') === 0) raw = raw.slice(8);
    raw = decodeURIComponent(raw).replace(/^\/?/, '');
    return SECTIONS.indexOf(raw) !== -1 ? raw : '';
  }

  // Determine which section to show first (same logic as nav.js): hash > stored > My Voices.
  var _savedSection = _storedSection();
  var _activeSection = _hashSection() || ((_savedSection && SECTIONS.indexOf(_savedSection) !== -1) ? _savedSection : 's-voices');

  // ── App version for cache-busting ────────────────────────────────────────
  // Read from the already-loaded style.css href — no extra network round trip.
  // Falls back to fetching /api/version only if the tag isn't found.
  var _appVersion = 'dev';
  var _styleHref = (document.querySelector('link[href*="style.css"]') || {}).getAttribute ? document.querySelector('link[href*="style.css"]').getAttribute('href') : '';
  var _styleMatch = _styleHref && _styleHref.match(/[?&]v=([^&]+)/);
  if (_styleMatch) {
    _appVersion = _styleMatch[1];
  } else {
    // Fallback: fetch from API (only on first ever load before style tag exists)
    try {
      var _vr = await fetch('/api/version');
      var _vd = await _vr.json();
      _appVersion = _vd.version || _appVersion;
    } catch (_) {}
  }

  // Session timestamp used ONLY for section HTML files (never cached by SW anyway).
  // JS/CSS use the version string so the service worker cache stays valid across reloads.
  var _ts = Date.now();

  function _inject(id, html) {
    var el = document.getElementById(id);
    if (el) el.innerHTML = html;
  }

  // ── 1. Load ONLY the active section before anything else ─────────────────
  // Feature modules set up DOM event listeners — the active section's elements
  // must exist when JS runs. Other sections are loaded in step 2.
  try {
    var _ar = await fetch('/static/sections/' + _activeSection + '.html?v=' + _ts);
    if (!_ar.ok) throw new Error(_ar.status + ' ' + _ar.statusText);
    _inject(_activeSection, await _ar.text());
  } catch (e) {
    var _ael = document.getElementById(_activeSection);
    if (_ael) _ael.innerHTML =
      '<p style="color:var(--red);padding:24px">Failed to load section <b>' +
      _activeSection + '</b>: ' + e.message + '</p>';
  }

  // ── 2. Fetch remaining sections in background (parallel with JS loading) ──
  // These run concurrently with utils + settings below. Because section HTML
  // files are much smaller than JS, they finish before the feature-module batch
  // needs them.
  var _bgSections = Promise.all(
    SECTIONS.filter(function (id) { return id !== _activeSection; })
      .map(async function (id) {
        try {
          var res = await fetch('/static/sections/' + id + '.html?v=' + _ts);
          if (!res.ok) throw new Error(res.status + ' ' + res.statusText);
          _inject(id, await res.text());
        } catch (e) {
          var el = document.getElementById(id);
          if (el) el.innerHTML =
            '<p style="color:var(--red);padding:24px">Failed to load section <b>' +
            id + '</b>: ' + e.message + '</p>';
        }
      })
  );

  // ── 3. Load JS in parallel batches ────────────────────────────────────────
  // Scripts with async=false are FETCHED in parallel but EXECUTED in DOM
  // insertion order — safe for modules that share a global scope.
  //
  // Each script gets up to 3 attempts before this rejects. Without a retry,
  // one dropped request on a flaky mobile connection left the rest of the
  // batch executing anyway (a script's own failure never blocked its
  // siblings) — a function or variable from the missing module stayed
  // undefined while everything downstream of it kept running, surfacing as
  // confusing symptoms nowhere near the real cause (confirmed live: a core
  // module failing to load left a later one throwing "fmtDbfs is not
  // defined", and a save button reachable at all reporting "No audio
  // ready" instead of the page ever explaining a script hadn't loaded).
  function _load(src, attemptsLeft) {
    attemptsLeft = attemptsLeft == null ? 3 : attemptsLeft;
    return new Promise(function (resolve, reject) {
      var s = document.createElement('script');
      s.src = src + '?v=' + _appVersion;
      s.async = false;   // fetch in parallel, execute in DOM order
      s.onload = resolve;
      s.onerror = function () {
        if (s.parentNode) s.parentNode.removeChild(s);
        if (attemptsLeft > 1) {
          setTimeout(function () {
            _load(src, attemptsLeft - 1).then(resolve, reject);
          }, 350 * (4 - attemptsLeft));   // 350ms, then 700ms before the last try
        } else {
          reject(new Error('Failed to load ' + src));
        }
      };
      document.body.appendChild(s);
    });
  }

  function _loadBatch(srcs) {
    return Promise.all(srcs.map(function (src) { return _load(src); }));
  }

  // Retries above absorb a transient drop; this is what the user sees when
  // a module still would not load after 3 tries — reloading is the only
  // real fix (nothing downstream of a missing module can be trusted), so
  // say so plainly rather than leaving a partially-working page to explain
  // itself through whatever error a missing function happens to throw.
  function _notifyLoadFailure() {
    console.error('One or more app modules failed to load after retries.');
    try {
      if (typeof window.toast === 'function') {
        window.toast('Some parts of the app failed to load. Please reload the page.', 'error', 20000);
        return;
      }
    } catch (_) {}
    // utils.js itself failed to load, or toast() errored -- fall back to
    // a plain banner rather than a silent console-only failure.
    var banner = document.createElement('div');
    banner.textContent = 'Some parts of the app failed to load. Please reload the page.';
    banner.style.cssText = 'position:fixed;top:0;left:0;right:0;z-index:6000;'
      + 'background:#b91c1c;color:#fff;padding:10px 16px;font:600 14px system-ui,sans-serif;text-align:center;';
    document.body.appendChild(banner);
  }

  // A — foundation (sequential: each must finish before the next batch starts)
  await _load('/static/js/utils.js');
  await _load('/static/js/i18n.js');     // defines window.t / applyI18n before features run
  await _load('/static/js/settings.js');

  // Wait for background sections BEFORE feature modules run.
  // Feature modules set up event listeners on DOM elements; all section HTML
  // must already be injected. On a local server the sections finish well before
  // settings.js completes, so this await is typically instant.
  await _bgSections;

  // C — feature modules: always try the bundle first (one request instead of 23).
  // Falls back to individual files if the bundle is missing or fails to load.
  var _featureFiles = [];
  var _lazyFeatureGroups = {};
  try {
    var _manifestResponse = await fetch('/static/module-manifest.json?v=' + _appVersion, { cache: 'no-store' });
    if (!_manifestResponse.ok) throw new Error('module manifest ' + _manifestResponse.status);
    var _manifest = await _manifestResponse.json();
    if (!Array.isArray(_manifest.core) || !_manifest.core.length) throw new Error('empty core module manifest');
    _featureFiles = _manifest.core.map(function (name) { return '/static/js/' + name + '.js'; });
    _lazyFeatureGroups = _manifest.lazy && typeof _manifest.lazy === 'object' ? _manifest.lazy : {};
  } catch (_) {
    console.error('Unable to load the feature module manifest');
  }
  var _bundleOk = false;
  try { await _load('/static/dist/main.min.js'); _bundleOk = true; }
  catch (_) { _bundleOk = false; }
  var _loadedFeatureModules = new Set();
  if (_bundleOk) _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
  if (!_bundleOk) {
    try {
      await _loadBatch(_featureFiles);
      _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
    } catch (error) {
      // A module that still failed after 3 retries each is not a blip --
      // the app cannot be trusted to work correctly from here. Mark
      // whatever DID load so ensureFeatureModules doesn't re-fetch it, and
      // say so plainly rather than silently revealing a partial app.
      _featureFiles.forEach(function (src) { _loadedFeatureModules.add(src); });
      console.error('Core feature modules failed to load', error);
      _notifyLoadFailure();
    }
  }

  // Public section loader used by nav.js. Modules are loaded in manifest order,
  // exactly once, and a failed group leaves the existing section visible rather
  // than turning navigation into a blank screen.
  window.ensureFeatureModules = function (sectionId) {
    var names = Array.isArray(_lazyFeatureGroups[sectionId]) ? _lazyFeatureGroups[sectionId] : [];
    var pending = names.map(function (name) { return '/static/js/' + name + '.js'; })
      .filter(function (src) { return !_loadedFeatureModules.has(src); });
    if (!pending.length) return Promise.resolve();
    pending.forEach(function (src) { _loadedFeatureModules.add(src); });
    return _loadBatch(pending).catch(function (error) {
      pending.forEach(function (src) { _loadedFeatureModules.delete(src); });
      console.error('Unable to load section modules for ' + sectionId, error);
      _notifyLoadFailure();
      throw error;
    });
  };

  // D — navigation (must run before init/reveal so routing is interactive before
  // async settings or voice-library refreshes can occupy the backend).
  try { await _load('/static/nav.js'); } catch (_) {}

  // A deep link or restored section must have its feature code before init and
  // before the first visible section is activated.
  try { if (window.ensureFeatureModules) await window.ensureFeatureModules(_activeSection); } catch (_) {}

  // E — init (needs feature modules and nav globals to be defined)
  try { await _load('/static/js/init.js'); } catch (_) {}

  // ── Remove skeleton, reveal sections ────────────────────────────────────
  // Always runs — even if a script above failed to load, showing a partial UI
  // is far better than leaving the skeleton on screen indefinitely.
  _revealApp();

  function _revealApp() {
    clearTimeout(_skTimeout);
    var sk = document.getElementById('app-skeleton');
    // Always remove the skeleton if it's still in the DOM — never gate on
    // sk-hidden (the 8s fallback may have added that class without removing it).
    if (sk) {
      sk.classList.add('sk-hidden');
      setTimeout(function () { if (sk.parentNode) sk.parentNode.removeChild(sk); }, 300);
    }
    document.querySelectorAll('.page-section').forEach(function (s) {
      s.style.display = '';
    });
  }

  // ── i18n: add the language picker and translate the (now fully-rendered) UI ──
  if (window.initLangPicker) window.initLangPicker();
  if (window.applyI18n) window.applyI18n(document);
  if (window.initAccessibilityEnhancements) window.initAccessibilityEnhancements();

  // E — post-init modules load in background AFTER the UI is already visible.
  // Engines, AI backends, and conversation load while the user browses other tabs.
  _loadBatch([
    '/static/js/engines.js',
    '/static/js/ai-backends.js',
    '/static/js/conversation.js',
  ]);
})();