const { app, BrowserWindow, WebContentsView, ipcMain, session } = require('electron');
const path = require('path');
const fs = require('fs');
const os = require('os');
const cheerio = require('cheerio');
const { ElectronBlocker, adsAndTrackingLists } = require('@cliqz/adblocker-electron');
const { autoUpdater } = require('electron-updater');

// Disable Trusted Types CSP enforcement engine-wide.
// YouTube sends `Content-Security-Policy: require-trusted-types-for 'script'`,
// which blocks the cliqz adblocker's scriptlet injection (it uses plain
// `script.text = ...`) → 52+ console errors and broken anti-adblock neutralizers.
// Stripping the CSP header via webRequest doesn't work — the adblocker's own
// onHeadersReceived hook overwrites ours (Electron allows only one listener
// per session). Disabling the Blink feature is the cleanest fix; safe in a
// kiosk single-user context.
app.commandLine.appendSwitch('disable-blink-features', 'TrustedDOMTypes');

const CONFIG_PATH = path.join(os.homedir(), '.ESH-Media.json');
const BLOCKER_CACHE_PATH = path.join(os.homedir(), '.ESH-Media-adblock-v3.bin');
const DEFAULT_TRUSTED_DOMAINS = [
  // Google ecosystem (OAuth)
  'google.com', 'accounts.google.com', 'googleapis.com', 'googleusercontent.com',
  'gstatic.com', 'youtube.com', 'ytimg.com', 'googlevideo.com',
  // Yandex
  'yandex.ru', 'yandex.com', 'passport.yandex.ru', 'passport.yandex.com', 'yastatic.net',
  // GitHub
  'github.com', 'github.io', 'githubassets.com', 'githubusercontent.com',
  // VK / Mail.ru
  'vk.com', 'vk.ru', 'vkuser.net', 'mail.ru', 'my.mail.ru',
  // Microsoft (login.live.com etc., некоторые сайты через них)
  'live.com', 'microsoft.com', 'microsoftonline.com', 'office.com',
  // Apple
  'apple.com', 'icloud.com',
  // Facebook (для соцлогина)
  'facebook.com', 'fb.com',
];
const DEFAULT_CONFIG = { apps: [], proxy: { host: '127.0.0.1', port: '7890' }, trustedDomains: DEFAULT_TRUSTED_DOMAINS };

let blockerPromise = null;
let cachedTrustedDomains = DEFAULT_TRUSTED_DOMAINS;

function loadTrustedDomainsFromDisk() {
  try {
    if (fs.existsSync(CONFIG_PATH)) {
      const cfg = JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8'));
      if (Array.isArray(cfg.trustedDomains) && cfg.trustedDomains.length) {
        cachedTrustedDomains = cfg.trustedDomains;
      }
    }
  } catch (_) {}
}

function isTrustedDomain(hostname) {
  if (!hostname) return false;
  const h = hostname.toLowerCase();
  return cachedTrustedDomains.some(d => {
    const dom = d.toLowerCase().replace(/^\./, '');
    return h === dom || h.endsWith('.' + dom);
  });
}

function getBlocker() {
  if (blockerPromise) return blockerPromise;
  blockerPromise = (async () => {
    // Load from cache first (avoids re-downloading on every startup)
    if (fs.existsSync(BLOCKER_CACHE_PATH)) {
      try {
        const data = fs.readFileSync(BLOCKER_CACHE_PATH);
        const b = ElectronBlocker.deserialize(new Uint8Array(data));
        console.log('[adblock] loaded from cache');
        return b;
      } catch (e) {
        console.warn('[adblock] cache invalid, re-downloading:', e.message);
      }
    }
    // Download filter lists (EasyList + EasyPrivacy + uBlock Origin + Russian ad networks)
    console.log('[adblock] downloading filter lists...');
    const fetchFn = (url, opts) => getProxySession().fetch(url, opts);
    const russianLists = [
      'https://filters.adtidy.org/extension/ublock/filters/1.txt',      // AdGuard Russian
      'https://easylist-downloads.adblockplus.org/ruadlist+easylist.txt', // RuAdList
    ];
    const b = await ElectronBlocker.fromLists(fetchFn, [...adsAndTrackingLists, ...russianLists]);
    // Whitelist domains that need ALL requests passed through unfiltered.
    // Tracking-list false positives on these break critical functionality:
    //   • Google: OAuth/login integrity checks fail without gstatic + analytics endpoints
    //     → "Возможно, этот браузер или приложение небезопасны" error
    //   • Yandex/Mail/Microsoft/Apple: same OAuth-style integrity flows
    //   • TMDB: movie search API and poster CDN
    const whitelist = [
      '@@||api.themoviedb.org^', '@@||image.tmdb.org^', '@@||themoviedb.org^',
      '@@||google.com^', '@@||googleapis.com^', '@@||googleusercontent.com^',
      '@@||gstatic.com^', '@@||youtube.com^', '@@||ytimg.com^', '@@||googlevideo.com^',
      '@@||google-analytics.com^', '@@||googletagmanager.com^',
      '@@||yandex.ru^', '@@||yandex.com^', '@@||yastatic.net^', '@@||mc.yandex.ru^',
      '@@||github.com^', '@@||githubassets.com^', '@@||githubusercontent.com^',
      '@@||vk.com^', '@@||vk.ru^', '@@||vkuser.net^',
      '@@||mail.ru^', '@@||my.mail.ru^', '@@||imgsmail.ru^',
      '@@||microsoft.com^', '@@||microsoftonline.com^', '@@||live.com^', '@@||office.com^',
      '@@||apple.com^', '@@||icloud.com^',
      '@@||facebook.com^', '@@||fbcdn.net^',
    ];
    b.updateFromDiff({ added: whitelist });
    fs.writeFileSync(BLOCKER_CACHE_PATH, Buffer.from(b.serialize()));
    console.log('[adblock] filter lists downloaded and cached');
    return b;
  })();
  return blockerPromise;
}

function enableBlockingInSession(sess) {
  getBlocker()
    .then(b => {
      b.enableBlockingInSession(sess);
      // Remove the cliqz preload script that the blocker just registered on this
      // session. The preload injects inline <script> elements (via createTextNode +
      // appendChild) to neutralize anti-adblock scripts, but:
      //   • Strict-CSP sites (kinogo via Cloudflare, etc.) reject inline scripts
      //     without a matching nonce → "Refused to execute inline script".
      //   • Trusted-Types sites (YouTube, Gmail) reject `script.appendChild(text)`
      //     → "HTMLScriptElement was directly modified" (52 errors).
      // We keep the adblocker's network blocking and CSP filtering (via the still-
      // attached webRequest hooks), losing only the niche scriptlet/cosmetic-DOM
      // injection layer that breaks more sites than it helps.
      const before = sess.getPreloads();
      const after = before.filter(p => !/adblocker-electron-preload/i.test(p));
      if (after.length !== before.length) {
        sess.setPreloads(after);
        console.log('[adblock] enabled for session (preload script disabled)');
      } else {
        console.log('[adblock] enabled for session');
      }
    })
    .catch(e => console.warn('[adblock] failed to enable:', e.message));
}

const isDev = !app.isPackaged;
const RENDERER_URL = 'http://localhost:5173';
const PRELOAD_PATH = path.join(__dirname, 'preload.js');
const EXTENSIONS_PATH = path.join(__dirname, 'extensions');

const HEADER_H = 50;
const SIDEBAR_COLLAPSED_W = 75;


let mainWindow = null;
let currentView = null;
let loaderView = null;
let openedApps = [];
const errorViews = [];
const confirmViews = [];
let proxySession = null;
let directSession = null;
let pendingNavigate = null; // { view, url } — cross-domain redirect awaiting confirmation

// --- Sessions ---

function getProxySession() {
  if (!proxySession) {
    proxySession = session.fromPartition('persist:proxy');
    proxySession.setUserAgent(app.userAgentFallback);
    enableBlockingInSession(proxySession);
  }
  return proxySession;
}

function getDirectSession() {
  if (!directSession) {
    directSession = session.fromPartition('persist:direct');
    directSession.setUserAgent(app.userAgentFallback);
    directSession.setProxy({ proxyRules: 'direct://' });
    enableBlockingInSession(directSession);
  }
  return directSession;
}

async function applyProxy(host, port) {
  const proxyRules = `http=${host}:${port};https=${host}:${port};socks=socks5://${host}:${port}`;
  await getProxySession().setProxy({ proxyRules });
  await session.defaultSession.setProxy({ proxyRules });
}

// --- Extensions ---

async function loadExtensions() {
  if (!fs.existsSync(EXTENSIONS_PATH)) return;
  const entries = fs.readdirSync(EXTENSIONS_PATH, { withFileTypes: true });
  for (const entry of entries) {
    if (!entry.isDirectory()) continue;
    const extPath = path.join(EXTENSIONS_PATH, entry.name);
    // Fix Windows-style backslash paths in declarative_net_request manifest entries
    const manifestPath = path.join(extPath, 'manifest.json');
    if (fs.existsSync(manifestPath)) {
      try {
        const manifest = JSON.parse(fs.readFileSync(manifestPath, 'utf8'));
        let changed = false;
        // Remove rule_resources entries whose files don't exist on disk
        if (manifest.declarative_net_request?.rule_resources) {
          const valid = manifest.declarative_net_request.rule_resources.filter(r => {
            const rPath = r.path.replace(/^\//, '').split('/').join(path.sep);
            return fs.existsSync(path.join(extPath, rPath));
          });
          if (valid.length !== manifest.declarative_net_request.rule_resources.length) {
            manifest.declarative_net_request.rule_resources = valid;
            changed = true;
            console.log(`Removed ${manifest.declarative_net_request.rule_resources.length === 0 ? 'all' : 'missing'} DNR rule_resources for: ${entry.name}`);
          }
        }
        // Remove service_worker — Electron doesn't support MV3 service workers for extensions
        if (manifest.background?.service_worker) {
          delete manifest.background.service_worker;
          if (!Object.keys(manifest.background).length) delete manifest.background;
          changed = true;
        }
        // Remove permissions unsupported by Electron to suppress warnings
        const UNSUPPORTED_PERMS = new Set(['contextMenus', 'notifications', 'webNavigation', 'management']);
        if (manifest.permissions) {
          const filtered = manifest.permissions.filter(p => !UNSUPPORTED_PERMS.has(p));
          if (filtered.length !== manifest.permissions.length) {
            manifest.permissions = filtered;
            changed = true;
          }
        }
        if (changed) fs.writeFileSync(manifestPath, JSON.stringify(manifest, null, 2), 'utf8');
      } catch (e) {
        console.warn('Failed to patch manifest for', entry.name, e.message);
      }
    }
    // Load into all sessions so content scripts run in WebContentsViews too
    const sessionsToLoad = [
      session.defaultSession,
      session.fromPartition('persist:proxy'),
      session.fromPartition('persist:direct'),
    ];
    for (const sess of sessionsToLoad) {
      try {
        await sess.loadExtension(extPath, { allowFileAccess: true });
      } catch (e) {
        // only log once (defaultSession gives the meaningful error)
        if (sess === session.defaultSession)
          console.warn('Failed to load extension', entry.name, e.message);
      }
    }
    console.log('Loaded extension:', entry.name);
  }
}

// --- Updates ---

function compareSemver(a, b) {
  // Returns 1 if a > b, -1 if a < b, 0 if equal. Numeric per-segment, missing → 0.
  const pa = a.split('.').map(n => parseInt(n, 10) || 0);
  const pb = b.split('.').map(n => parseInt(n, 10) || 0);
  for (let i = 0; i < Math.max(pa.length, pb.length); i++) {
    const x = pa[i] || 0, y = pb[i] || 0;
    if (x > y) return 1;
    if (x < y) return -1;
  }
  return 0;
}

// --- Auto-update (electron-updater + Gitea API discovery) ---
//
// Gitea 1.24.7 doesn't expose /releases/latest/download/ as a stable URL shortcut,
// so we use the API to find the latest release at runtime, then point setFeedURL
// at THAT release's download directory. electron-updater fetches latest.yml from
// there and uses .blockmap files for differential downloads (saves ~70 MB per
// minor patch since most of the 80 MB installer is unchanged Electron runtime).

autoUpdater.autoDownload = true;   // download in background as soon as we detect an update
autoUpdater.autoInstallOnAppQuit = false; // we'll manually trigger install — kiosk shouldn't surprise-restart mid-video
autoUpdater.allowDowngrade = false;
autoUpdater.logger = {
  info: (m) => console.log('[updater]', m),
  warn: (m) => console.warn('[updater]', m),
  error: (m) => console.error('[updater]', m),
  debug: () => {},
};

function sendUpdateStatus(payload) {
  if (mainWindow && !mainWindow.webContents.isDestroyed()) {
    mainWindow.webContents.send('update-status', payload);
  }
}

autoUpdater.on('update-available', (info) => {
  sendUpdateStatus({ state: 'available', version: info.version, currentVersion: app.getVersion() });
});
autoUpdater.on('download-progress', (p) => {
  sendUpdateStatus({ state: 'downloading', percent: Math.round(p.percent), transferred: p.transferred, total: p.total, bytesPerSecond: p.bytesPerSecond });
});
autoUpdater.on('update-downloaded', (info) => {
  sendUpdateStatus({ state: 'ready', version: info.version, currentVersion: app.getVersion() });
});
autoUpdater.on('error', (err) => {
  console.warn('[updater] error:', err?.message || err);
  sendUpdateStatus({ state: 'error', message: err?.message || String(err) });
});

let updateCheckInFlight = false;
async function checkForUpdates() {
  if (updateCheckInFlight) return;
  if (!app.isPackaged) {
    console.log('[updater] dev mode, skipping');
    return;
  }
  updateCheckInFlight = true;
  try {
    // Discover latest release via Gitea API (no auth, public endpoint)
    const res = await getDirectSession().fetch(
      'https://gitea.esh-service.ru/api/v1/repos/public/ESH-Media/releases/latest'
    );
    if (!res.ok) return;
    const data = await res.json();
    const latestTag = (data.tag_name || '').replace(/^v/, '');
    const current = app.getVersion();
    if (!latestTag || compareSemver(latestTag, current) <= 0) {
      console.log(`[updater] up to date (current=${current}, latest=${latestTag || 'none'})`);
      return;
    }
    // Verify latest.yml is present in this release's assets — without it autoUpdater can't proceed.
    const hasYml = (data.assets || []).some(a => a.name === 'latest.yml');
    if (!hasYml) {
      console.warn(`[updater] release v${latestTag} has no latest.yml — falling back to manual download link`);
      const installer = (data.assets || []).find(a => a.name.toLowerCase().endsWith('.exe'));
      sendUpdateStatus({
        state: 'manual',
        version: latestTag,
        currentVersion: current,
        installerUrl: installer?.browser_download_url || data.html_url,
        installerName: installer?.name || '',
      });
      return;
    }
    // Point feedURL at this release's download directory
    const feedUrl = `https://gitea.esh-service.ru/public/ESH-Media/releases/download/v${latestTag}/`;
    console.log(`[updater] setFeedURL ${feedUrl}`);
    autoUpdater.setFeedURL({ provider: 'generic', url: feedUrl });
    await autoUpdater.checkForUpdates();
  } catch (e) {
    console.warn('[updater] check failed:', e?.message || e);
  } finally {
    updateCheckInFlight = false;
  }
}

ipcMain.handle('install-update', () => {
  // Quits the app and runs the downloaded installer with NSIS /S silent flag.
  // Installer waits for the running process to exit, replaces files, then relaunches.
  try {
    setImmediate(() => autoUpdater.quitAndInstall(true, true));
    return true;
  } catch (e) {
    console.warn('[updater] quitAndInstall failed:', e?.message);
    return false;
  }
});

ipcMain.handle('check-update-now', async () => {
  await checkForUpdates();
  return true;
});

// --- Window ---

function attachDevToolsShortcut(webContents) {
  // Ctrl+Shift+I / F12 open DevTools on this webContents.
  // Always available so a kiosk machine can be debugged without un-kiosking.
  webContents.on('before-input-event', (_e, input) => {
    if (input.type !== 'keyDown') return;
    const isDevToolsCombo =
      (input.control && input.shift && (input.key === 'I' || input.key === 'i')) ||
      input.key === 'F12';
    if (isDevToolsCombo) {
      try { webContents.openDevTools({ mode: 'detach' }); } catch (_) {}
    }
  });
}

async function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1280,
    height: 800,
    kiosk: true,
    autoHideMenuBar: true,
    webPreferences: {
      preload: PRELOAD_PATH,
      contextIsolation: true,
      nodeIntegration: false,
    },
  });

  attachDevToolsShortcut(mainWindow.webContents);

  if (isDev) {
    mainWindow.loadURL(RENDERER_URL);
  } else {
    mainWindow.loadFile(path.join(__dirname, 'dist', 'index.html'));
  }
}

// --- View helpers ---

function getViewBounds(sidebarWidth) {
  const w = sidebarWidth !== undefined ? sidebarWidth : SIDEBAR_COLLAPSED_W;
  const { width, height } = mainWindow.getBounds();
  return { x: w, y: HEADER_H, width: width - w, height: height - HEADER_H };
}

function addChild(view) {
  mainWindow.contentView.addChildView(view);
}

function removeChild(view) {
  try { mainWindow.contentView.removeChildView(view); } catch (_) {}
}

function bringOverlaysToTop() {
  confirmViews.forEach(c => { removeChild(c.view); addChild(c.view); });
  errorViews.forEach(v => { removeChild(v); addChild(v); });
}

function sendOpenedApps(activeName) {
  mainWindow.webContents.send(
    'update-opened-apps',
    openedApps.map(a => ({ name: a.name, url: a.url, imageUrl: a.imageUrl })),
    activeName
  );
}

// --- Loader ---

function setLoader() {
  if (loaderView) return;
  const { width, height } = mainWindow.getBounds();
  loaderView = new WebContentsView({ webPreferences: { contextIsolation: true, nodeIntegration: false } });
  addChild(loaderView);
  loaderView.setBounds({ x: 0, y: HEADER_H, width, height: height - HEADER_H });
  if (isDev) {
    loaderView.webContents.loadURL(`${RENDERER_URL}/loader.html`);
  } else {
    loaderView.webContents.loadFile(path.join(__dirname, 'dist', 'loader.html'));
  }
}

function removeLoader() {
  if (!loaderView) return;
  const lv = loaderView;
  loaderView = null;
  lv.webContents.executeJavaScript(`document.body.style.opacity='0'`).catch(() => {});
  setTimeout(() => { try { removeChild(lv); lv.webContents.destroy(); } catch (_) {} }, 260);
}

// --- Dialogs (WebContentsView overlays) ---

function dialogFadeOut(view, cb) {
  view.webContents.executeJavaScript(
    `document.body.classList.remove('visible');document.body.classList.add('hiding')`
  ).catch(() => {});
  setTimeout(cb, 230);
}

function makeDialogView() {
  const { width, height } = mainWindow.getBounds();
  const view = new WebContentsView({
    webPreferences: { contextIsolation: true, nodeIntegration: false, preload: PRELOAD_PATH },
  });
  view.setBackgroundColor('#00000000');
  view.setBounds({ x: 0, y: 0, width, height });
  return view;
}

function setError(title, text) {
  const view = makeDialogView();
  errorViews.push(view);
  const query = new URLSearchParams({ title: title || '', text: text || '' }).toString();
  view.webContents.once('did-finish-load', () => { addChild(view); });
  if (isDev) {
    view.webContents.loadURL(`${RENDERER_URL}/dialog-error.html?${query}`);
  } else {
    view.webContents.loadFile(path.join(__dirname, 'dist', 'dialog-error.html'), { query: { title: title || '', text: text || '' } });
  }
}

function removeError() {
  if (!errorViews.length) return;
  const view = errorViews.pop();
  dialogFadeOut(view, () => { try { removeChild(view); view.webContents.destroy(); } catch (_) {} });
}

function setConfirm(text, actionOnYes) {
  const view = makeDialogView();
  confirmViews.push({ view, actionOnYes });
  const query = new URLSearchParams({ text: text || '' }).toString();
  view.webContents.once('did-finish-load', () => { addChild(view); });
  if (isDev) {
    view.webContents.loadURL(`${RENDERER_URL}/dialog-confirm.html?${query}`);
  } else {
    view.webContents.loadFile(path.join(__dirname, 'dist', 'dialog-confirm.html'), { query: { text: text || '' } });
  }
}

function removeConfirm() {
  if (!confirmViews.length) return;
  const { view } = confirmViews.pop();
  dialogFadeOut(view, () => { try { removeChild(view); view.webContents.destroy(); } catch (_) {} });
}


function removeView(name) {
  const idx = openedApps.findIndex(a => a.name === name);
  if (idx === -1) return;
  const [app] = openedApps.splice(idx, 1);
  removeChild(app.view);
  app.view.webContents.destroy();
  if (currentView && currentView.name === name) currentView = null;
  sendOpenedApps('home');
  scheduleSessionSave();
}

// --- Session persistence (preserves opened tabs across restart, incl. auto-update relaunch) ---

let sessionSaveTimer = null;
function scheduleSessionSave() {
  if (sessionSaveTimer) clearTimeout(sessionSaveTimer);
  sessionSaveTimer = setTimeout(saveSessionNow, 500);
}

function saveSessionNow() {
  sessionSaveTimer = null;
  try {
    const tabs = openedApps.map(a => ({
      name: a.name,
      url: a.history[a.historyPosition] || a.url, // latest URL the user was on, not the initial one
      imageUrl: a.imageUrl || '',
      useProxy: !!a.useProxy,
    }));
    const activeName = currentView?.name || 'home';
    const cfg = fs.existsSync(CONFIG_PATH) ? JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8')) : {};
    cfg.openedSession = { tabs, activeName, savedAt: Date.now() };
    fs.writeFileSync(CONFIG_PATH, JSON.stringify(cfg, null, 2), 'utf8');
  } catch (e) {
    console.warn('[session] save failed:', e.message);
  }
}

async function restoreSession() {
  try {
    if (!fs.existsSync(CONFIG_PATH)) return;
    const cfg = JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8'));
    const sess = cfg.openedSession;
    if (!sess || !Array.isArray(sess.tabs) || !sess.tabs.length) return;
    console.log(`[session] restoring ${sess.tabs.length} tab(s), active=${sess.activeName}`);
    // Spawn each saved tab by replaying create-view, sequentially with a small delay.
    // Concurrent create-view calls in v1.0.3 caused races: multiple setLoader/addChild
    // interleaved → some views ended up unmounted (white screen). Spacing them out
    // gives each view time to mount before the next steals currentView.
    const fakeEvent = { sender: mainWindow.webContents };
    for (const tab of sess.tabs) {
      if (!tab?.name || !tab?.url) continue;
      ipcMain.emit('create-view', fakeEvent, tab.name, tab.url, tab.imageUrl || '', 1.0, !!tab.useProxy);
      await new Promise(r => setTimeout(r, 150));
    }
    // Switch to saved active if it isn't already the last-spawned (currentView).
    if (sess.activeName === 'home') {
      ipcMain.emit('hide-view', fakeEvent);
      sendOpenedApps('home');
    } else if (sess.activeName && sess.activeName !== currentView?.name) {
      ipcMain.emit('show-view', fakeEvent, sess.activeName);
    }
  } catch (e) {
    console.warn('[session] restore failed:', e.message);
  }
}

// --- IPC ---

ipcMain.on('create-view', async (_event, name, url, imageUrl, _zoom, useProxy) => {
  if (!url || !name) return;

  const existing = openedApps.find(a => a.name === name);
  if (existing) {
    if (currentView && currentView.view) removeChild(currentView.view);
    addChild(existing.view);
    bringOverlaysToTop();
    currentView = existing;
    currentView.view.setBounds(getViewBounds());
    sendOpenedApps(name);
    mainWindow.webContents.send('updateWebButtons', { history: existing.history, historyPosition: existing.historyPosition });
    return;
  }

  if (currentView && currentView.view) removeChild(currentView.view);
  setLoader();

  const view = new WebContentsView({
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: false,
      session: useProxy ? getProxySession() : getDirectSession(),
    },
  });

  const appEntry = { name, url, imageUrl, useProxy: !!useProxy, view, history: [url], historyPosition: 0 };
  openedApps.push(appEntry);
  currentView = appEntry;
  view.setBounds(getViewBounds());
  attachDevToolsShortcut(view.webContents);

  view.webContents.on('did-finish-load', () => {
    removeLoader();
    addChild(view);
    bringOverlaysToTop();
    // Inject fade-in overlay so the page appears smoothly instead of blinking
    view.webContents.executeJavaScript(`
      (function(){
        if(document.__nfFade)return; document.__nfFade=true;
        const o=document.createElement('div');
        o.style.cssText='position:fixed;inset:0;background:#111;z-index:2147483647;pointer-events:none;transition:opacity 0.35s ease;';
        document.documentElement.appendChild(o);
        requestAnimationFrame(()=>requestAnimationFrame(()=>{
          o.style.opacity='0';
          setTimeout(()=>o.remove(),370);
        }));
      })()
    `).catch(()=>{});
  });

  const trackNavigation = (navigatingUrl) => {
    const app = openedApps.find(a => a.name === name);
    if (!app) return;
    if (navigatingUrl === app.history[app.historyPosition]) {
      mainWindow.webContents.send('updateWebButtons', { history: app.history, historyPosition: app.historyPosition });
      return;
    }
    if (app.historyPosition < app.history.length - 1) {
      app.history = app.history.slice(0, app.historyPosition + 1);
    }
    app.history.push(navigatingUrl);
    app.historyPosition = app.history.length - 1;
    mainWindow.webContents.send('updateWebButtons', { history: app.history, historyPosition: app.historyPosition });
    scheduleSessionSave();
  };

  let origHostname = '';
  try { origHostname = new URL(url).hostname; } catch (_) {}

  view.webContents.on('will-navigate', (e, newUrl) => {
    if (newUrl.startsWith('data:')) { trackNavigation(newUrl); return; }
    let newHostname = '';
    try { newHostname = new URL(newUrl).hostname; } catch (_) { trackNavigation(newUrl); return; }
    if (origHostname && newHostname && newHostname !== origHostname && !isTrustedDomain(newHostname)) {
      e.preventDefault();
      pendingNavigate = { view, url: newUrl };
      setConfirm(`Перейти на "${newHostname}"?`, 'navigate-confirmed');
      return;
    }
    trackNavigation(newUrl);
  });
  view.webContents.on('will-redirect', (_e, u) => trackNavigation(u));
  view.webContents.setWindowOpenHandler(({ url: newUrl, frameName, features }) => {
    let newHostname = '';
    try { newHostname = new URL(newUrl).hostname; } catch (_) {}

    // Trusted domain → open as real popup BrowserWindow with same session.
    // This is what OAuth flows need: window.opener.postMessage() works,
    // popup can close itself when done, parent stays on the original page.
    if (newHostname && isTrustedDomain(newHostname)) {
      return {
        action: 'allow',
        overrideBrowserWindowOptions: {
          width: 520, height: 640,
          parent: mainWindow,
          autoHideMenuBar: true,
          webPreferences: {
            session: view.webContents.session,
            contextIsolation: true,
            nodeIntegration: false,
          },
        },
      };
    }

    // Untrusted cross-domain → ask the user (original behavior).
    if (origHostname && newHostname && newHostname !== origHostname) {
      pendingNavigate = { view, url: newUrl };
      setConfirm(`Перейти на "${newHostname}"?`, 'navigate-confirmed');
      return { action: 'deny' };
    }

    // Same-origin popup → just navigate the current view.
    trackNavigation(newUrl);
    view.webContents.loadURL(newUrl);
    return { action: 'deny' };
  });

  sendOpenedApps(name);
  mainWindow.webContents.send('updateWebButtons', { history: appEntry.history, historyPosition: appEntry.historyPosition });
  scheduleSessionSave();

  view.webContents.loadURL(url).catch(() => {
    removeView(name);
    removeLoader();
    setError('Ошибка', `Не удалось загрузить: ${name}`);
  });
});

ipcMain.on('remove-view', (_event, name) => removeView(name || (currentView && currentView.name)));

ipcMain.on('hide-view', () => {
  if (currentView && currentView.view) removeChild(currentView.view);
  currentView = null;
  scheduleSessionSave();
});

ipcMain.on('show-view', (_event, name) => {
  const app = openedApps.find(a => a.name === name);
  if (!app) return;
  if (currentView && currentView.view) removeChild(currentView.view);
  currentView = app;
  addChild(app.view);
  bringOverlaysToTop();
  mainWindow.webContents.send('updateWebButtons', { history: app.history, historyPosition: app.historyPosition });
  scheduleSessionSave();
});

let sidebarAnim = null;
const SIDEBAR_ANIM_MS = 250;

function animateSidebarResize(targetX) {
  if (!currentView || !currentView.view) return;
  if (sidebarAnim) { clearInterval(sidebarAnim); sidebarAnim = null; }

  const fromX = currentView.view.getBounds().x;
  if (fromX === targetX) return;

  const startTime = Date.now();
  // easeInOut
  const ease = t => t < 0.5 ? 2 * t * t : 1 - Math.pow(-2 * t + 2, 2) / 2;

  sidebarAnim = setInterval(() => {
    const t = Math.min((Date.now() - startTime) / SIDEBAR_ANIM_MS, 1);
    const x = Math.round(fromX + (targetX - fromX) * ease(t));
    if (currentView && currentView.view) {
      const { width, height } = mainWindow.getBounds();
      currentView.view.setBounds({ x, y: HEADER_H, width: width - x, height: height - HEADER_H });
    }
    if (t >= 1) { clearInterval(sidebarAnim); sidebarAnim = null; }
  }, 16);
}

ipcMain.on('adjust-view', (_event, expanded) => {
  animateSidebarResize(expanded ? 200 : SIDEBAR_COLLAPSED_W);
});

ipcMain.on('backwardPage', () => {
  const app = openedApps.find(a => a.name === (currentView && currentView.name));
  if (!app || app.historyPosition <= 0) return;
  app.historyPosition--;
  currentView.view.webContents.loadURL(app.history[app.historyPosition])
    .catch(() => setError('Ошибка', 'Страница не найдена'));
  mainWindow.webContents.send('updateWebButtons', { history: app.history, historyPosition: app.historyPosition });
});

ipcMain.on('forwardPage', () => {
  const app = openedApps.find(a => a.name === (currentView && currentView.name));
  if (!app || app.historyPosition >= app.history.length - 1) return;
  app.historyPosition++;
  currentView.view.webContents.loadURL(app.history[app.historyPosition])
    .catch(() => setError('Ошибка', 'Страница не найдена'));
  mainWindow.webContents.send('updateWebButtons', { history: app.history, historyPosition: app.historyPosition });
});

ipcMain.on('refreshPage', () => {
  const app = openedApps.find(a => a.name === (currentView && currentView.name));
  if (!app) return;
  currentView.view.webContents.loadURL(app.history[app.historyPosition])
    .catch(() => setError('Ошибка', 'Страница не найдена'));
});

ipcMain.on('collapseWithHeader', () => {
  if (!currentView || !currentView.view) return;
  const { width, height } = mainWindow.getBounds();
  currentView.view.setBounds({ x: 0, y: 1, width, height: height - 1 });
});

ipcMain.on('expandWithHeader', () => {
  if (!currentView || !currentView.view) return;
  currentView.view.setBounds(getViewBounds());
});

ipcMain.on('set-proxy', async (_event, host, port) => applyProxy(host, port));

// --- Movie Search ---

const MOVIE_PARSERS = {
  dle: {
    buildUrl: (domain, query) =>
      `https://${domain}/?do=search&subaction=search&story=${encodeURIComponent(query)}`,
    parse: (html, domain) => {
      const $ = cheerio.load(html);
      const results = [];
      const toAbs = (src) => {
        if (!src) return '';
        if (src.startsWith('http')) return src;
        return src.startsWith('/') ? `https://${domain}${src}` : `https://${domain}/${src}`;
      };
      $('.short, .movie-item, .th-item, .card, article.item, .shortstory, article.shortStory, .shortStory').each((_, el) => {
        const $el = $(el);
        const $link = $el.find('h2 a, .th-title a, .title a, .short-title a, .card-title a, .name a, .hTitle a').first();
        const title = $link.text().trim();
        let href = $link.attr('href') || '';
        if (href && !href.startsWith('http')) href = `https://${domain}${href}`;
        const rawSrc = $el.find('img[data-src]').first().attr('data-src') || $el.find('img[src]').first().attr('src') || '';
        const poster = rawSrc.startsWith('data:') ? '' : toAbs(rawSrc);
        const year = $el.text().match(/\b(19|20)\d{2}\b/)?.[0];
        if (title && href) results.push({ title, url: href, poster, year, source: domain });
      });
      return results;
    },
  },
  hdrezka: {
    buildUrl: (domain, query) =>
      `https://${domain}/?do=search&subaction=search&story=${encodeURIComponent(query)}`,
    parse: (html, domain) => {
      const $ = cheerio.load(html);
      const results = [];
      const toAbs = (src) => {
        if (!src) return '';
        if (src.startsWith('http')) return src;
        return src.startsWith('/') ? `https://${domain}${src}` : `https://${domain}/${src}`;
      };
      $('.b-content__inline_item').each((_, el) => {
        const $el = $(el);
        const $link = $el.find('.b-content__inline_item-link a').first();
        const title = $link.text().trim();
        const href = $link.attr('href') || '';
        const poster = toAbs($el.find('img').first().attr('src') || '');
        const year = $el.find('.b-content__inline_item-link div').text().match(/\b(19|20)\d{2}\b/)?.[0];
        if (title && href) results.push({ title, url: href, poster, year, source: domain });
      });
      return results;
    },
  },
  filmix: {
    buildUrl: (domain, query) =>
      `https://${domain}/search/${encodeURIComponent(query)}/`,
    parse: (html, domain) => {
      const $ = cheerio.load(html);
      const results = [];
      const toAbs = (src) => {
        if (!src) return '';
        if (src.startsWith('http')) return src;
        return src.startsWith('/') ? `https://${domain}${src}` : `https://${domain}/${src}`;
      };
      $('.post-item, .movie-item, .item').each((_, el) => {
        const $el = $(el);
        const $link = $el.find('a.title, h2 a, .name a').first();
        const title = $link.text().trim();
        let href = $link.attr('href') || '';
        if (href && !href.startsWith('http')) href = `https://${domain}${href}`;
        const poster = toAbs($el.find('img').first().attr('src') || '');
        const year = $el.text().match(/\b(19|20)\d{2}\b/)?.[0];
        if (title && href) results.push({ title, url: href, poster, year, source: domain });
      });
      return results;
    },
  },
};

const SEARCH_HEADERS = {
  'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'Accept-Language': 'ru-RU,ru;q=0.9,en;q=0.8',
};

async function searchHdrezkaAjax(site, query) {
  try {
    const url = `https://${site.domain}/engine/ajax/search.php`;
    console.log(`[search] ${site.domain} -> AJAX`);
    const resp = await getProxySession().fetch(url, {
      method: 'POST',
      body: `q=${encodeURIComponent(query)}`,
      headers: {
        ...SEARCH_HEADERS,
        'X-Requested-With': 'XMLHttpRequest',
        'Content-Type': 'application/x-www-form-urlencoded',
        'Referer': `https://${site.domain}/`,
      },
      signal: AbortSignal.timeout(10000),
    });
    if (!resp.ok) return [];
    const html = await resp.text();
    const $ = cheerio.load(html);
    const results = [];
    $('ul li a').each((_, el) => {
      const $el = $(el);
      const href = $el.attr('href') || '';
      const title = $el.find('.enty').text().trim();
      if (title && href) results.push({ title, url: href, poster: '', year: '', source: site.domain });
    });
    console.log(`[search] ${site.domain} AJAX found: ${results.length}`);
    return results;
  } catch (e) {
    console.warn(`[search] ${site.domain} AJAX error:`, e.message);
    return [];
  }
}

function searchWithView(site, query) {
  const parser = MOVIE_PARSERS[site.type];
  if (!parser) return Promise.resolve([]);
  const url = parser.buildUrl(site.domain, query);
  console.log(`[search] ${site.domain} -> ${url} (browser)`);

  return new Promise((resolve) => {
    const view = new WebContentsView({
      webPreferences: { contextIsolation: true, nodeIntegration: false, session: getProxySession() },
    });

    let extractTimer = null;
    const cleanup = (results) => {
      if (extractTimer) clearTimeout(extractTimer);
      try { view.webContents.destroy(); } catch (_) {}
      resolve(results);
    };

    const globalTimer = setTimeout(() => {
      console.warn(`[search] ${site.domain} timeout`);
      cleanup([]);
    }, 25000);

    const tryExtract = () => {
      if (extractTimer) clearTimeout(extractTimer);
      extractTimer = setTimeout(() => {
        clearTimeout(globalTimer);
        // Poll every 400ms until results found or 5s elapsed (handles AJAX-loaded content)
        const deadline = Date.now() + 5000;
        const poll = async () => {
          try {
            const html = await view.webContents.executeJavaScript('document.documentElement.outerHTML');
            const results = parser.parse(html, site.domain);
            if (results.length > 0 || Date.now() >= deadline) {
              console.log(`[search] ${site.domain} browser found: ${results.length}`);
              cleanup(results);
            } else {
              setTimeout(poll, 400);
            }
          } catch (e) {
            console.warn(`[search] ${site.domain} extract error:`, e.message);
            cleanup([]);
          }
        };
        poll();
      }, 800); // initial wait for JS redirects / challenge pages
    };

    view.webContents.on('did-finish-load', tryExtract);
    view.webContents.on('did-fail-load', (_e, code, desc) => {
      clearTimeout(globalTimer);
      console.warn(`[search] ${site.domain} load failed: ${code} ${desc}`);
      cleanup([]);
    });

    view.webContents.loadURL(url, { userAgent: SEARCH_HEADERS['User-Agent'] }).catch(e => {
      clearTimeout(globalTimer);
      console.warn(`[search] ${site.domain} loadURL error:`, e.message);
      cleanup([]);
    });
  });
}

async function searchOneSite(site, query) {
  if (site.type === 'hdrezka') return searchHdrezkaAjax(site, query);
  return searchWithView(site, query);
}

ipcMain.handle('search-tmdb', async (_event, query, apiKey) => {
  console.log(`[tmdb] searching: "${query}", key type: ${apiKey ? (apiKey.startsWith('eyJ') ? 'bearer' : 'api_key') : 'none'}`);
  try {
    const isBearer = apiKey.startsWith('eyJ');
    const url = isBearer
      ? `https://api.themoviedb.org/3/search/multi?query=${encodeURIComponent(query)}&language=ru-RU&include_adult=false`
      : `https://api.themoviedb.org/3/search/multi?api_key=${apiKey}&query=${encodeURIComponent(query)}&language=ru-RU&include_adult=false`;
    const headers = isBearer
      ? { 'Authorization': `Bearer ${apiKey}`, 'Content-Type': 'application/json' }
      : {};
    const resp = await getProxySession().fetch(url, { headers, signal: AbortSignal.timeout(8000) });
    console.log(`[tmdb] status: ${resp.status}`);
    if (!resp.ok) {
      const body = await resp.text().catch(() => '');
      console.warn(`[tmdb] error body:`, body.slice(0, 200));
      return { error: `TMDB error ${resp.status}`, results: [] };
    }
    const data = await resp.json();
    const results = (data.results || [])
      .filter(r => r.media_type === 'movie' || r.media_type === 'tv')
      .slice(0, 20)
      .map(r => ({
        id: r.id,
        mediaType: r.media_type,
        title: r.title || r.name || '',
        originalTitle: r.original_title || r.original_name || '',
        year: (r.release_date || r.first_air_date || '').slice(0, 4),
        poster: r.poster_path ? `https://image.tmdb.org/t/p/w300${r.poster_path}` : '',
        overview: r.overview || '',
        rating: r.vote_average ? r.vote_average.toFixed(1) : '',
      }));
    console.log(`[tmdb] results: ${results.length}`);
    return { results };
  } catch (e) {
    console.error(`[tmdb] exception:`, e.message);
    return { error: e.message, results: [] };
  }
});

ipcMain.handle('discover-tmdb', async (_event, { apiKey, mediaType, sortBy, genreIds, years, minRating, countries, page }) => {
  // Multi-filter semantics (per user request):
  //   genres   → AND  (movie must match ALL selected genres)         — TMDB comma-join in with_genres
  //   countries→ OR   (movie matches ANY selected country/lang)      — TMDB pipe-join
  //   years    → OR   (movie released in ANY selected year)          — fan-out: one request per year, merge
  //   rating   → min threshold (single)                              — vote_average.gte
  try {
    const isBearer = apiKey.startsWith('eyJ');
    const type = mediaType === 'tv' ? 'tv' : 'movie';
    const genreArr = Array.isArray(genreIds) ? genreIds.filter(Boolean) : [];
    const countryArr = Array.isArray(countries) ? countries.filter(Boolean) : [];
    const yearArr = Array.isArray(years) ? years.filter(Boolean) : [];

    const buildParams = (yearOverride) => {
      const params = new URLSearchParams({
        language: 'ru-RU',
        sort_by: sortBy || 'popularity.desc',
        page: String(page || 1),
        include_adult: 'false',
      });
      if (!isBearer) params.set('api_key', apiKey);
      if (genreArr.length) params.set('with_genres', genreArr.join(','));   // AND
      if (minRating) params.set('vote_average.gte', minRating);
      if (countryArr.length) {
        // Mix: codes that map to original_language go to with_original_language (pipe-OR),
        // raw country codes go to with_origin_country (pipe-OR). Both fields can coexist.
        const COUNTRY_LANG = {
          RU: 'ru', JP: 'ja', KR: 'ko', CN: 'zh', FR: 'fr',
          DE: 'de', IT: 'it', ES: 'es', SE: 'sv', DK: 'da', TR: 'tr', IN: 'hi',
        };
        const langs = [], origCountries = [];
        for (const c of countryArr) {
          if (COUNTRY_LANG[c]) langs.push(COUNTRY_LANG[c]);
          else origCountries.push(c);
        }
        if (langs.length) params.set('with_original_language', langs.join('|'));
        if (origCountries.length) params.set('with_origin_country', origCountries.join('|'));
      }
      if (yearOverride) {
        if (type === 'movie') params.set('primary_release_year', String(yearOverride));
        else params.set('first_air_date_year', String(yearOverride));
      }
      return params;
    };

    const fetchOnce = async (params) => {
      const url = `https://api.themoviedb.org/3/discover/${type}?${params}`;
      const headers = isBearer ? { 'Authorization': `Bearer ${apiKey}` } : {};
      const resp = await getProxySession().fetch(url, { headers, signal: AbortSignal.timeout(8000) });
      if (!resp.ok) return { results: [], totalPages: 0, status: resp.status };
      const data = await resp.json();
      return { results: data.results || [], totalPages: data.total_pages || 1, status: 200 };
    };

    let aggregated = [];
    let maxPages = 1;
    if (yearArr.length === 0) {
      const r = await fetchOnce(buildParams(null));
      if (r.status !== 200) return { error: `TMDB ${r.status}`, results: [], totalPages: 1 };
      aggregated = r.results;
      maxPages = r.totalPages;
    } else {
      // Fan out per year, merge by id (TMDB has no OR for discrete years)
      const settled = await Promise.allSettled(yearArr.map(y => fetchOnce(buildParams(y))));
      const seen = new Set();
      for (const s of settled) {
        if (s.status !== 'fulfilled' || s.value.status !== 200) continue;
        maxPages = Math.max(maxPages, s.value.totalPages);
        for (const r of s.value.results) {
          if (seen.has(r.id)) continue;
          seen.add(r.id);
          aggregated.push(r);
        }
      }
      // Re-sort merged set by popularity (since TMDB sorted within each year)
      aggregated.sort((a, b) => (b.popularity || 0) - (a.popularity || 0));
    }

    const results = aggregated.map(r => ({
      id: r.id,
      mediaType: type,
      title: (type === 'movie' ? r.title : r.name) || '',
      originalTitle: (type === 'movie' ? r.original_title : r.original_name) || '',
      year: ((type === 'movie' ? r.release_date : r.first_air_date) || '').slice(0, 4),
      poster: r.poster_path ? `https://image.tmdb.org/t/p/w300${r.poster_path}` : '',
      overview: r.overview || '',
      rating: r.vote_average ? r.vote_average.toFixed(1) : '',
    }));
    return { results, totalPages: Math.min(maxPages, 500) };
  } catch (e) {
    return { error: e.message, results: [], totalPages: 1 };
  }
});

ipcMain.handle('search-movies', async (_event, query, sites) => {
  const settled = await Promise.allSettled(sites.map(s => searchOneSite(s, query)));
  return settled.flatMap(r => r.status === 'fulfilled' ? r.value : []);
});

ipcMain.handle('get-current-page', () => {
  if (!currentView) return null;
  return {
    name: currentView.name,
    url: currentView.history[currentView.historyPosition],
    imageUrl: currentView.imageUrl || '',
  };
});

ipcMain.handle('read-config', () => {
  try {
    if (fs.existsSync(CONFIG_PATH)) {
      return JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8'));
    }
  } catch (e) {
    console.warn('Failed to read config:', e.message);
  }
  return DEFAULT_CONFIG;
});

ipcMain.on('write-config', (_event, data) => {
  try {
    fs.writeFileSync(CONFIG_PATH, JSON.stringify(data, null, 2), 'utf8');
    if (Array.isArray(data?.trustedDomains)) cachedTrustedDomains = data.trustedDomains;
  } catch (e) {
    console.warn('Failed to write config:', e.message);
  }
});

ipcMain.handle('get-page-meta', async () => {
  if (!currentView || !currentView.view || currentView.view.webContents.isDestroyed()) return null;
  try {
    return await currentView.view.webContents.executeJavaScript(`
      (function() {
        const get = (sel, attr) => { const el = document.querySelector(sel); return el ? (el.getAttribute(attr) || '') : ''; };
        const abs = (u) => { try { return new URL(u, location.href).href } catch (_) { return u } };
        let poster = get('meta[property="og:image:secure_url"]', 'content')
                  || get('meta[property="og:image"]', 'content')
                  || get('meta[name="twitter:image"]', 'content')
                  || get('meta[name="twitter:image:src"]', 'content');
        // HDRezka has a higher-res poster in the sidebar
        if (!poster || /hdrezka|rezka/i.test(location.hostname)) {
          const side = document.querySelector('.b-sidecover img');
          if (side && side.src) poster = side.src;
        }
        // JSON-LD fallback
        if (!poster) {
          for (const s of document.querySelectorAll('script[type="application/ld+json"]')) {
            try {
              const d = JSON.parse(s.textContent || 'null');
              const arr = Array.isArray(d) ? d : [d];
              for (const it of arr) {
                if (!it) continue;
                const img = it.image || it.poster || (it.thumbnailUrl);
                if (img) { poster = Array.isArray(img) ? img[0] : (typeof img === 'string' ? img : img.url); if (poster) break; }
              }
              if (poster) break;
            } catch (_) {}
          }
        }
        const title = (get('meta[property="og:title"]', 'content') || document.title || '').trim();
        return { poster: poster ? abs(poster) : '', title, url: location.href };
      })()
    `);
  } catch (e) {
    return null;
  }
});

ipcMain.handle('is-kiosk', () => mainWindow.isKiosk());

ipcMain.handle('toggle-kiosk', () => {
  if (mainWindow.isKiosk()) {
    mainWindow.setKiosk(false);
    mainWindow.maximize();
    mainWindow.setMenuBarVisibility(false);
    return false;
  } else {
    mainWindow.setKiosk(true);
    return true;
  }
});

ipcMain.on('confirm',(_event, text, actionOnYes) => setConfirm(text, actionOnYes));

ipcMain.on('action', (_event, action) => {
  if (action === 'error') {
    removeError();
  } else if (action === 'confirmYes') {
    const last = confirmViews[confirmViews.length - 1];
    if (last) {
      if (last.actionOnYes === 'navigate-confirmed' && pendingNavigate) {
        const { view: pView, url: pUrl } = pendingNavigate;
        pendingNavigate = null;
        if (!pView.webContents.isDestroyed()) {
          pView.webContents.loadURL(pUrl).catch(() => setError('Ошибка', `Не удалось загрузить: ${pUrl}`));
        }
      } else {
        mainWindow.webContents.send(last.actionOnYes);
      }
    }
    removeConfirm();
  } else if (action === 'confirmNo') {
    if (confirmViews.length && confirmViews[confirmViews.length - 1].actionOnYes === 'navigate-confirmed') {
      pendingNavigate = null;
    }
    removeConfirm();
  }
});

// --- App lifecycle ---

app.whenReady().then(async () => {
  // Strip Electron/app tokens from User-Agent: Google blocks Electron's default UA
  // with "Поддержка JavaScript отключена" on accounts.google.com. We keep the Chrome
  // version Electron advertises (sufficient for modern features) but remove the
  // Electron/X.X.X and ESH-Media/X.X.X identifiers.
  const cleanUserAgent = app.userAgentFallback
    .replace(/Electron\/[\d.]+\s*/g, '')
    .replace(/ESH-Media\/[\d.]+\s*/g, '')
    .replace(/\s+/g, ' ')
    .trim();
  console.log('[ua]', cleanUserAgent);
  app.userAgentFallback = cleanUserAgent;
  session.defaultSession.setUserAgent(cleanUserAgent);

  // Add Referer to image requests so hotlink protection doesn't block them.
  // (Sec-CH-UA spoofing was tried in 1.0.4 and caused white pages — reverted.
  //  Google embedded-browser detection is now mitigated only via adblock whitelist
  //  of gstatic/google-analytics/etc., which previously was being eaten silently.)
  session.defaultSession.webRequest.onBeforeSendHeaders(
    { urls: ['https://*/*', 'http://*/*'] },
    (details, callback) => {
      const headers = details.requestHeaders;
      if (details.resourceType === 'image' && !headers['Referer'] && !headers['referer']) {
        try {
          const u = new URL(details.url);
          headers['Referer'] = `${u.protocol}//${u.hostname}/`;
        } catch (_) {}
      }
      callback({ requestHeaders: headers });
    }
  );

  // (Trusted Types now handled engine-wide via --disable-blink-features
  // command-line switch at file top. webRequest.onHeadersReceived strip
  // was tried in 1.0.6 but the cliqz adblocker overwrites the listener.)

  // Apply proxy from config before blocker tries to download filter lists
  loadTrustedDomainsFromDisk();
  try {
    if (fs.existsSync(CONFIG_PATH)) {
      const cfg = JSON.parse(fs.readFileSync(CONFIG_PATH, 'utf8'));
      if (cfg?.proxy?.host && cfg?.proxy?.port) await applyProxy(cfg.proxy.host, cfg.proxy.port);
    }
  } catch (_) {}

  enableBlockingInSession(session.defaultSession);
  getProxySession();
  getDirectSession();
  await loadExtensions();
  await createWindow();

  mainWindow.webContents.once('did-finish-load', async () => {
    await restoreSession();
    setTimeout(checkForUpdates, 4000);
    setInterval(checkForUpdates, 60 * 60 * 1000); // re-check hourly for long-running kiosk sessions
  });
});

app.on('before-quit', () => {
  // Final synchronous save (timer might be pending).
  if (sessionSaveTimer) { clearTimeout(sessionSaveTimer); sessionSaveTimer = null; }
  saveSessionNow();
});

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') app.quit();
});

app.on('activate', async () => {
  if (BrowserWindow.getAllWindows().length === 0) await createWindow();
});