const HOSTERS = ['doodstream.com', 'voe.sx', 'vidmoly.me', 'byse.sx', 'clouddrop.cc'];

// Dropdown options for "Add Account" modal: value -> label
const HOSTER_ADD_OPTIONS = [
  { value: 'doodstream.com', label: 'Doodstream (Web Login)', hoster: 'doodstream.com', authType: 'login' },
  { value: 'doodstream.com:api', label: 'Doodstream (API)', hoster: 'doodstream.com', authType: 'api' },
  { value: 'voe.sx', label: 'Voe (Web Login)', hoster: 'voe.sx', authType: 'login' },
  { value: 'voe.sx:api', label: 'Voe (API)', hoster: 'voe.sx', authType: 'api' },
  { value: 'vidmoly.me', label: 'Vidmoly (Web Login)', hoster: 'vidmoly.me', authType: 'login' },
  { value: 'byse.sx', label: 'Byse (API)', hoster: 'byse.sx', authType: 'api' },
  { value: 'clouddrop.cc', label: 'Clouddrop (API)', hoster: 'clouddrop.cc', authType: 'api' }
];

// --- State ---
let selectedFiles = []; // { path, name, size }
let selectedUploadHosters = [];
let config = { hosters: {}, hosterSettings: {}, globalSettings: {} };
let hosterSettings = {};
let uploading = false;
let healthCheckRunning = false;
let accountStatuses = {}; // { accountId: { status: 'ok'|'warn'|'error'|'checking'|'unchecked', message: '' } }
let editingAccountId = null; // null = adding, string = editing account by ID
let autoHealthCheckEnabled = true;
let queuePersistTimer = null;
let settingsSaveTimer = null;
let lastUploadStats = { state: 'idle', globalSpeedKbs: 0, totalBytes: 0, elapsed: 0, activeJobs: 0 };
const AUTO_CHECK_PREF_KEY = 'autoHealthCheckBeforeUpload';
const QUEUE_COL_WIDTHS_KEY = 'queueColumnWidthsPx';
const STARTABLE_QUEUE_STATUSES = new Set(['preview', 'queued', 'error', 'aborted', 'skipped']);

function isStartableQueueStatus(status) {
  return STARTABLE_QUEUE_STATUSES.has(status);
}

function isStartableQueueJob(job) {
  return !!job && isStartableQueueStatus(job.status);
}

// Queue state
let queueJobs = []; // { id, file, fileName, hoster, status, bytesUploaded, bytesTotal, speedKbs, elapsed, remaining, error, result, attempt, maxAttempts, link }
const _jobIndexById = new Map(); // id -> job (O(1) lookup)
const _jobIndexByUploadId = new Map(); // uploadId -> job
const selectedJobIds = new Set();
let _sessionTotalBytes = 0; // Total bytes ever added to queue this session
let _sessionUploadedBytes = 0; // Bytes fully uploaded this session (done jobs)
const _sessionTrackedJobs = new Set(); // Job IDs already counted for totalBytes
const _sessionDoneJobs = new Set(); // Job IDs already counted for uploadedBytes
const _completedUploadKeys = new Set(); // 'filepath|hoster' keys for done uploads (survives removeFromQueueOnDone)
const _deletedJobIds = new Set(); // IDs of jobs explicitly deleted by user (prevents re-creation from stale progress callbacks)
// Coalesce removeFromQueueOnDone removals into one filter pass per microtask
// to avoid O(N²) behaviour when a burst of jobs finish at once. Logic now
// lives in lib/coalesced-set.js so it can be unit-tested with a manual
// scheduler. Optional-chained so the renderer still works if the script
// failed to load — falls back to immediate per-event filter (legacy slow
// path), better than crashing.
const _doneRemovalCoalescer = window.CoalescedSet
  ? window.CoalescedSet.makeCoalescedSet({
      apply: (drop) => { queueJobs = queueJobs.filter(j => !drop.has(j.id)); }
    })
  : null;
const queueSortState = { key: 'filename', direction: 'asc' };

// History state
let historyRowsData = [];
let historySortState = { key: 'date', direction: 'desc' };
let _historySortClicked = false;

// Session-specific files for the "Files" panel (resets each session)
let sessionFilesData = [];
const recentSortState = { key: 'date', direction: 'desc' };
let _recentSortClicked = false;
const selectedRecentIds = new Set();
// Maintained incrementally — avoids O(n) filter() scans every 250ms in the status bar.
let _sessionDoneCount = 0;
let _sessionErrorCount = 0;
// O(1) dedup for maybeAddSessionFile (was O(n) sessionFilesData.some).
// Huge with thousands of rows × thousands of incoming results.
const _sessionFileKeys = new Set();

window.addEventListener('error', (e) => {
  try {
    const msg = `RENDERER ERROR: ${e.message} at ${e.filename}:${e.lineno}:${e.colno}${e.error && e.error.stack ? '\n' + e.error.stack : ''}`;
    if (window.api && window.api.debugLog) window.api.debugLog(msg);
  } catch {}
});
window.addEventListener('unhandledrejection', (e) => {
  try {
    const reason = e.reason && e.reason.stack ? e.reason.stack : (e.reason && e.reason.message) || String(e.reason);
    if (window.api && window.api.debugLog) window.api.debugLog(`RENDERER UNHANDLED REJECTION: ${reason}`);
  } catch {}
});

// --- Init ---
async function init() {
  config = await window.api.getConfig();
  hosterSettings = config.hosterSettings || {};
  autoHealthCheckEnabled = loadAutoCheckPreference();
  ensureAccountStatusEntries();
  syncSelectedUploadHosters();
  restoreQueueStateFromConfig();
  await _autoDeduplicateFromLog();
  renderHosterSummary();
  renderHosterModal();
  renderSettings();
  renderAccounts();
  setupListeners();
  setupDragDrop();
  restoreQueueColumnWidths();
  loadHistory();
  _refreshSessionFailedSnapshot();
  renderRecentUploadsPanel();
  updateUploadView();
  updateStatusBar();

  // Version display
  try {
    const version = await window.api.getVersion();
    const versionLabel = document.getElementById('versionLabel');
    if (versionLabel) versionLabel.textContent = `v${version}`;
  } catch {}

  // Update listeners
  window.api.onUpdateAvailable(showUpdateBanner);
  window.api.onUpdateProgress(handleUpdateProgress);

  window.api.onUploadProgress((data) => {
    handleProgress(data);
  });
  if (window.api.onUploadProgressBatch) {
    window.api.onUploadProgressBatch((batch) => {
      if (!Array.isArray(batch)) return;
      for (let i = 0; i < batch.length; i++) handleProgress(batch[i]);
    });
  }
  window.api.onUploadBatchDone((data) => {
    handleBatchDone(data);
  });
  window.api.onUploadStats((data) => {
    handleStats(data);
  });
  window.api.onShutdownCountdown(handleShutdownCountdown);
  window.api.onUploadLogFallback((data) => {
    const path = data && data.fallbackPath ? data.fallbackPath : '(Fallback)';
    showCopyToast(`Log-Pfad nicht beschreibbar — schreibe nach: ${path}`, 8000);
  });
  window.api.onLogPathAutoUpdated((data) => {
    if (!data || !data.logFilePath) return;
    // Keep the in-memory config and the visible Settings input in sync so
    // the user sees the path that's actually being written to, and the
    // next save from the UI doesn't revert it.
    if (config && config.globalSettings) config.globalSettings.logFilePath = data.logFilePath;
    const input = document.getElementById('logFilePathInput');
    if (input) input.value = data.logFilePath;
    showCopyToast(`Log-Pfad automatisch auf funktionierenden Ordner gesetzt`, 5000);
  });
  window.api.onAccountRotationLog((entry) => {
    // Surface only the user-visible rotation events as toasts; full detail
    // goes to account-rotation.log. Keep it quiet otherwise.
    if (!entry || !entry.event) return;
    const hosterLabel = entry.hoster ? getHosterLabel(entry.hoster) : '';
    if (entry.event === 'rotate') {
      showCopyToast(`${hosterLabel}: Account-Wechsel → Fallback`);
    } else if (entry.event === 'rotation-end') {
      showCopyToast(`${hosterLabel}: Keine weiteren Fallback-Accounts verfügbar`);
    } else if (entry.event === 'final-error') {
      showCopyToast(`${hosterLabel}: Alle Accounts ausgeschöpft`);
    }
  });

  // Folder monitor: auto-queue new files
  window.api.onFolderMonitorNewFiles((files) => {
    window.api.debugLog('folder-monitor: received ' + files.length + ' file(s)');
    const fm = config.globalSettings && config.globalSettings.folderMonitor;
    const fmHosters = fm && Array.isArray(fm.hosters) && fm.hosters.length > 0 ? fm.hosters : [];

    if (fmHosters.length > 0) {
      // Pre-selected hosters: set them as active selection and add directly to queue
      selectedUploadHosters = fmHosters.slice();
      const existing = new Set();
      for (const f of selectedFiles) existing.add(f.path);
      for (const f of _pendingFiles) existing.add(f.path);
      const newFiles = [];
      for (const p of files) {
        if (existing.has(p)) continue;
        existing.add(p);
        const name = p.split('\\').pop().split('/').pop();
        newFiles.push({ path: p, name, size: null });
      }
      if (newFiles.length > 0) {
        const newPaths = new Set(newFiles.map(f => f.path));
        selectedFiles.push(...newFiles);
        buildQueuePreview();
        updateUploadView();
        if (fm.autoStart && !uploading && !healthCheckRunning) {
          startUpload();
        } else if (uploading) {
          // Inject new preview jobs into the running batch
          const newJobs = queueJobs.filter(j => j.status === 'preview' && newPaths.has(j.file));
          if (newJobs.length > 0) {
            newJobs.forEach(j => { j.status = 'queued'; });
            renderQueueTable();
            window.api.addJobsToBatch({
              jobs: newJobs.map(j => ({ id: j.id, file: j.file, fileName: j.fileName, hoster: j.hoster }))
            }).then(result => { _markSkippedJobs(result); }).catch(() => {});
            persistQueueStateSoon(true);
          }
        }
      }
    } else {
      // No pre-selected hosters: open modal
      addPathsToQueue(files);
    }
  });

  // Account switched notification
  window.api.onAccountSwitched((data) => {
    window.api.debugLog(`account-switched: ${data.hoster} ${data.fromAccountId} -> ${data.toAccountId}`);
  });

  // Drop target window: files dropped on the small floating window
  window.api.onDropTargetFiles((paths) => {
    addPathsToQueue(paths);
  });

  // Remote client count updates (registered once, not per renderSettings call)
  window.api.onRemoteClientCount(() => {
    const el = document.getElementById('remoteConnectionStatus');
    if (el && el.style.color === 'rgb(16, 185, 129)') {
      window.api.remoteStatus().then(status => {
        if (status.running) {
          el.textContent = `Aktiv auf Port ${status.port} — ${status.clientCount} Client(s) verbunden`;
        }
      }).catch(() => {});
    }
  });

  window.api.debugLog('init complete, all listeners registered');

  // Restore always-on-top state
  try {
    const onTop = await window.api.getAlwaysOnTop();
    alwaysOnTopState = !!onTop;
  } catch {}

  scheduleStartupAccountCheck();
}

// --- Tab switching ---
let _historyDirty = false;
function _isHistoryTabActive() {
  const tab = document.querySelector('.tab.active');
  return !!(tab && tab.dataset.view === 'history');
}
// Cache the tab/view collections once and use event delegation on the parent
// so tab switches don't trigger three querySelectorAll walks per click.
(() => {
  const tabs = Array.from(document.querySelectorAll('.tab'));
  const views = Array.from(document.querySelectorAll('.view'));
  const tabsByView = {};
  const viewsById = {};
  for (const t of tabs) tabsByView[t.dataset.view] = t;
  for (const v of views) viewsById[v.id] = v;
  let activeTab = tabs.find(t => t.classList.contains('active')) || tabs[0];

  const handle = (target) => {
    const tab = target.closest('.tab');
    if (!tab || tab === activeTab) return;
    if (activeTab) {
      activeTab.classList.remove('active');
      const prevView = viewsById[`${activeTab.dataset.view}-view`];
      if (prevView) prevView.classList.remove('active');
    }
    tab.classList.add('active');
    const nextView = viewsById[`${tab.dataset.view}-view`];
    if (nextView) nextView.classList.add('active');
    activeTab = tab;
    if (tab.dataset.view === 'history') {
      _historyDirty = false;
      loadHistory();
    }
  };

  const tabBar = tabs[0] && tabs[0].parentElement;
  if (tabBar) {
    tabBar.addEventListener('click', (e) => handle(e.target));
  } else {
    // Fallback: bind per-tab if somehow no common parent
    tabs.forEach(t => t.addEventListener('click', () => handle(t)));
  }
})();

// --- Hoster selection ---
function accountHasCreds(name, account) {
  if (!account) return false;
  if (account.authType === 'api') return !!account.apiKey;
  if (account.authType === 'login') return !!(account.username && account.password);
  // Fallback
  if (name === 'vidmoly.me') return !!(account.username && account.password);
  if (name === 'voe.sx' || name === 'doodstream.com') return !!(account.username && account.password) || !!account.apiKey;
  return !!account.apiKey;
}

// Returns hosters that have at least one enabled account with credentials
function getAvailableHosters() {
  const result = [];
  for (const name of HOSTERS) {
    const accounts = config.hosters[name];
    if (!Array.isArray(accounts)) continue;
    const hasEnabledAccount = accounts.some(a => a.enabled !== false && accountHasCreds(name, a));
    if (hasEnabledAccount) result.push({ name });
  }
  return result;
}

function syncSelectedUploadHosters() {
  const available = new Set(getAvailableHosters().map(item => item.name));
  selectedUploadHosters = selectedUploadHosters.filter(name => available.has(name));
  if (selectedUploadHosters.length === 0) {
    selectedUploadHosters = HOSTERS.filter(name => {
      const accounts = config.hosters[name];
      return Array.isArray(accounts) && accounts.some(a => a.enabled !== false && accountHasCreds(name, a));
    });
  }
}

function getSelectedHosters() {
  return selectedUploadHosters.slice();
}

function getHosterLabel(name) {
  const labels = {
    'doodstream.com': 'Doodstream',
    'voe.sx': 'VOE',
    'vidmoly.me': 'Vidmoly',
    'byse.sx': 'Byse',
    'clouddrop.cc': 'Clouddrop'
  };
  return labels[name] || name;
}

function getAccountAuthLabel(account) {
  if (!account) return '';
  if (account.authType === 'api') return 'API';
  if (account.authType === 'login') return 'Web Login';
  return '';
}

function getAccountDisplayName(name, account) {
  const authLabel = getAccountAuthLabel(account);
  return authLabel
    ? `${getHosterLabel(name)} (${authLabel})`
    : getHosterLabel(name);
}

function maskCredential(value, keep = 4) {
  const text = String(value || '').trim();
  if (!text) return '';
  if (text.length <= keep) return text;
  return `${text.slice(0, keep)}…${text.slice(-2)}`;
}

function ensureAccountStatusEntries() {
  const nextStatuses = {};
  for (const { account } of getAllAccountsFlat()) {
    if (account.id) {
      nextStatuses[account.id] = accountStatuses[account.id] || { status: 'unchecked', message: '' };
    }
  }
  accountStatuses = nextStatuses;
}

// Returns flat array of all accounts: [{ name, account, index }]
function getAllAccountsFlat() {
  const result = [];
  for (const name of HOSTERS) {
    const accounts = config.hosters[name];
    if (!Array.isArray(accounts)) continue;
    accounts.forEach((account, index) => result.push({ name, account, index }));
  }
  return result;
}

// Returns flat array of accounts with credentials
function getAccountsWithCredsFlat() {
  return getAllAccountsFlat().filter(({ name, account }) => accountHasCreds(name, account));
}

// Find account by ID across all hosters
function findAccountById(accountId) {
  for (const name of HOSTERS) {
    const accounts = config.hosters[name];
    if (!Array.isArray(accounts)) continue;
    const account = accounts.find(a => a.id === accountId);
    if (account) return { name, account };
  }
  return null;
}

function scheduleStartupAccountCheck() {
  const accounts = getAccountsWithCredsFlat();
  if (!accounts.length) return;
  setTimeout(() => {
    runHealthCheck('startup').catch(() => {});
  }, 500);
}

function renderHosterSummary() {
  const summary = document.getElementById('hosterSummary');
  if (!summary) return;
  const hosters = getSelectedHosters();
  if (hosters.length === 0) {
    summary.textContent = 'Keine Upload-Ziele ausgewählt';
  } else if (hosters.length === 1) {
    summary.textContent = `Aktives Ziel: ${getHosterLabel(hosters[0])}`;
  } else {
    summary.textContent = `${hosters.length} Ziele aktiv: ${hosters.map((name) => getHosterLabel(name)).join(', ')}`;
  }
}

function renderHosterModal() {
  const list = document.getElementById('hosterModalList');
  const hint = document.getElementById('hosterModalHint');
  if (!list || !hint) return;

  const available = getAvailableHosters();
  if (available.length === 0) {
    list.innerHTML = '';
    hint.textContent = 'Keine Hoster mit Zugangsdaten vorhanden. Bitte zuerst in den Accounts einen Login oder API-Key hinterlegen.';
    return;
  }

  list.innerHTML = available.map(item => {
    const checked = selectedUploadHosters.includes(item.name);
    // Get first enabled account's status for subtitle
    const accounts = config.hosters[item.name] || [];
    const enabledAccounts = accounts.filter(a => a.enabled !== false && accountHasCreds(item.name, a));
    const accountCount = enabledAccounts.length;
    let subtitle = `${accountCount} Account${accountCount !== 1 ? 's' : ''}`;
    // Check if any account has ok status
    const hasOk = enabledAccounts.some(a => accountStatuses[a.id] && accountStatuses[a.id].status === 'ok');
    const hasError = enabledAccounts.some(a => accountStatuses[a.id] && accountStatuses[a.id].status === 'error');
    if (hasOk) subtitle += ' • Bereit';
    else if (hasError) subtitle += ' • Fehler';
    return `
      <label class="hoster-option${checked ? ' selected' : ''}" data-hoster-option="${item.name}">
        <input type="checkbox" data-hoster-modal="${item.name}" ${checked ? 'checked' : ''}>
        <div class="hoster-option-main">
          <div class="hoster-option-title">${escapeHtml(getHosterLabel(item.name))}</div>
          <div class="hoster-option-subtitle">${subtitle}</div>
        </div>
      </label>
    `;
  }).join('');

  hint.textContent = 'Die Auswahl wird für neue Queue-Einträge verwendet.';

  list.querySelectorAll('input[data-hoster-modal]').forEach(input => {
    input.addEventListener('change', () => {
      input.closest('.hoster-option')?.classList.toggle('selected', input.checked);
    });
  });
}

function openHosterModal() {
  syncSelectedUploadHosters();
  renderHosterModal();
  document.getElementById('hosterModal').style.display = 'flex';
}

function closeHosterModal() {
  const modal = document.getElementById('hosterModal');
  if (modal) modal.style.display = 'none';
}

function applyHosterSelection() {
  selectedUploadHosters = Array.from(document.querySelectorAll('input[data-hoster-modal]:checked'))
    .map(input => input.dataset.hosterModal);
  // Move pending files to selectedFiles on confirm
  const pendingPaths = new Set(_pendingFiles.map(f => f.path));
  if (_pendingFiles.length > 0) {
    selectedFiles.push(..._pendingFiles);
    _pendingFiles = [];
  }
  renderHosterSummary();

  // During an active upload, build preview jobs for the new files and inject
  // them into the running batch immediately (otherwise they'd be lost on
  // handleBatchDone via syncSelectedFilesFromQueue)
  if (uploading && pendingPaths.size > 0) {
    buildQueuePreview(); // creates 'preview' jobs for new files
    const newJobs = queueJobs.filter(j => j.status === 'preview' && pendingPaths.has(j.file));
    if (newJobs.length > 0) {
      newJobs.forEach(j => { j.status = 'queued'; });
      renderQueueTable();
      window.api.addJobsToBatch({
        jobs: newJobs.map(j => ({ id: j.id, file: j.file, fileName: j.fileName, hoster: j.hoster }))
      }).then(result => { _markSkippedJobs(result); }).catch(() => {});
      persistQueueStateSoon(true);
    }
  }

  updateUploadView();
  persistQueueStateSoon(true); // immediate persist after adding files
  document.getElementById('hosterModal').style.display = 'none';
}

function cancelHosterModal() {
  _pendingFiles = [];
  closeHosterModal();
}

function normalizeRestoredJobStatus(status) {
  if (status === 'done' || status === 'error' || status === 'skipped' || status === 'preview' || status === 'aborted') return status;
  return 'queued';
}

function restoreQueueStateFromConfig() {
  if (config?.globalSettings?.resumeQueueOnLaunch === false) return;
  const pending = config?.globalSettings?.pendingQueue;
  if (!pending || typeof pending !== 'object') return;

  selectedUploadHosters = Array.isArray(pending.selectedUploadHosters)
    ? pending.selectedUploadHosters.filter(Boolean)
    : selectedUploadHosters;

  selectedFiles = Array.isArray(pending.selectedFiles)
    ? pending.selectedFiles
      .filter(file => file && file.path)
      .map(file => ({ path: file.path, name: file.name || file.path.split(/[\\/]/).pop(), size: file.size || 0 }))
    : [];

  const rawJobs = Array.isArray(pending.queueJobs)
    ? pending.queueJobs
      .filter(job => job && job.fileName && job.hoster)
      .map(job => ({
        id: job.id || `restored-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
        uploadId: null,
        file: job.file || '',
        fileName: job.fileName,
        hoster: job.hoster,
        status: normalizeRestoredJobStatus(job.status),
        bytesUploaded: job.status === 'done' ? (job.bytesTotal || 0) : 0,
        bytesTotal: job.bytesTotal || 0,
        speedKbs: 0,
        elapsed: 0,
        remaining: 0,
        error: job.error || null,
        result: job.result || null,
        attempt: 0,
        maxAttempts: job.maxAttempts || 0,
        link: '',
        progress: job.status === 'done' ? 1 : 0
      }))
    : [];

  // Deduplicate: keep the job with the best status for each file+hoster pair
  const seen = new Map();
  const statusPriority = { done: 0, uploading: 1, queued: 2, preview: 3, error: 4, aborted: 5, skipped: 6 };
  for (const job of rawJobs) {
    const key = `${job.file}|${job.hoster}`;
    const existing = seen.get(key);
    if (!existing || (statusPriority[job.status] ?? 9) < (statusPriority[existing.status] ?? 9)) {
      seen.set(key, job);
    }
  }
  queueJobs = Array.from(seen.values());
  rebuildJobIndex();
}

function buildPersistedQueueState() {
  const persistableJobs = queueJobs.filter(job => !['done', 'skipped'].includes(job.status));
  const selectedFileMap = new Map(selectedFiles.map(file => [file.path, file]));

  for (const job of persistableJobs) {
    if (job.file && !selectedFileMap.has(job.file)) {
      selectedFileMap.set(job.file, {
        path: job.file,
        name: job.fileName,
        size: job.bytesTotal || 0
      });
    }
  }

  if (selectedFileMap.size === 0 && queueJobs.every(job => ['done', 'skipped'].includes(job.status))) {
    return null;
  }

  // After a restart no upload manager is running, so any in-flight state
  // (queued / getting-server / uploading / retrying / aborted) is
  // meaningless. Collapse them all to 'preview' so the queue shows a
  // consistent "Bereit" for everything that didn't actually terminate.
  // Only true terminal states (done / error / skipped) survive as-is.
  const TERMINAL = new Set(['done', 'error', 'skipped']);
  return {
    selectedUploadHosters: getSelectedHosters(),
    selectedFiles: Array.from(selectedFileMap.values()),
    queueJobs: queueJobs.map(job => {
      const isTerminal = TERMINAL.has(job.status);
      return {
        id: job.id,
        file: job.file,
        fileName: job.fileName,
        hoster: job.hoster,
        status: isTerminal ? job.status : 'preview',
        bytesTotal: job.bytesTotal || 0,
        error: isTerminal ? (job.error || null) : null,
        result: isTerminal ? (job.result || null) : null,
        maxAttempts: job.maxAttempts || 0
      };
    })
  };
}

async function persistQueueStateNow() {
  const globalSettings = {
    ...(config.globalSettings || {}),
    pendingQueue: buildPersistedQueueState()
  };
  config.globalSettings = globalSettings;
  await window.api.saveGlobalSettings(globalSettings);
}

function persistQueueStateSoon(immediate) {
  clearTimeout(queuePersistTimer);
  if (immediate) {
    persistQueueStateNow().catch(() => {});
    return;
  }
  // Use longer debounce during uploads to reduce disk I/O
  const delay = uploading ? 10000 : 500;
  queuePersistTimer = setTimeout(() => {
    persistQueueStateNow().catch(() => {});
  }, delay);
}

function clearPersistedQueueStateSoon() {
  clearTimeout(queuePersistTimer);
  queuePersistTimer = setTimeout(() => {
    const globalSettings = {
      ...(config.globalSettings || {}),
      pendingQueue: null
    };
    config.globalSettings = globalSettings;
    window.api.saveGlobalSettings(globalSettings).catch(() => {});
  }, 0);
}

// --- File selection ---
function setupDragDrop() {
  const dropZone = document.getElementById('dropZone');
  // Allow drop on the entire upload view
  const uploadView = document.getElementById('upload-view');
  let _dragCounter = 0;
  dropZone.addEventListener('dragover', (e) => { e.preventDefault(); e.stopPropagation(); });
  dropZone.addEventListener('dragenter', (e) => { e.preventDefault(); _dragCounter++; dropZone.classList.add('drag-over'); });
  dropZone.addEventListener('dragleave', (e) => { e.preventDefault(); _dragCounter--; if (_dragCounter <= 0) { _dragCounter = 0; dropZone.classList.remove('drag-over'); } });
  dropZone.addEventListener('drop', (e) => {
    e.preventDefault(); e.stopPropagation(); _dragCounter = 0; dropZone.classList.remove('drag-over');
    addDroppedFiles(e.dataTransfer.files).catch(console.error);
  });
  dropZone.addEventListener('click', () => pickFiles());

  // Also handle drops on queue container
  uploadView.addEventListener('dragover', (e) => { e.preventDefault(); });
  uploadView.addEventListener('drop', (e) => {
    e.preventDefault();
    if (e.target.closest('.drop-zone')) return; // handled above
    addDroppedFiles(e.dataTransfer.files).catch(console.error);
  });
}

let _pendingFiles = []; // Files waiting for hoster modal confirmation

let _addingDropped = false;

async function addDroppedFiles(fileList) {
  if (_addingDropped) return;
  _addingDropped = true;
  try {
    const files = Array.from(fileList);
    const existingPaths = new Set([
      ...selectedFiles.map(f => f.path),
      ..._pendingFiles.map(f => f.path)
    ]);
    const newFiles = [];

    for (const file of files) {
      let filePath = '';
      try { filePath = window.api.getPathForFile(file); } catch { filePath = file.path || ''; }
      if (!filePath) continue;

      // Detect folders: directories report size 0 and empty type in Electron drag-and-drop
      if (file.type === '' && file.size === 0) {
        try {
          const folderFiles = await window.api.resolveFolderFiles(filePath);
          if (folderFiles && folderFiles.length > 0) {
            for (const fp of folderFiles) {
              if (!existingPaths.has(fp)) {
                const name = fp.split('\\').pop().split('/').pop();
                newFiles.push({ path: fp, name, size: null });
                existingPaths.add(fp);
              }
            }
            continue;
          }
        } catch {}
      }

      // Regular file
      const fileName = file.name || '';
      if (!existingPaths.has(filePath)) {
        newFiles.push({ path: filePath, name: fileName, size: file.size });
        existingPaths.add(filePath);
      }
    }

    if (newFiles.length > 0) {
      _pendingFiles.push(...newFiles);
      openHosterModal();
    }
  } finally {
    _addingDropped = false;
  }
}

async function pickFiles() {
  const paths = await window.api.selectFiles();
  if (!paths) return;
  addPathsToQueue(paths);
}

async function pickFolder() {
  const paths = await window.api.selectFolder();
  if (!paths) return;
  addPathsToQueue(paths);
}

function addPathsToQueue(paths) {
  // Build path-Set once so dedup is O(1) per candidate instead of O(n+m).
  // Matters when the user picks a folder with thousands of files.
  const existing = new Set();
  for (const f of selectedFiles) existing.add(f.path);
  for (const f of _pendingFiles) existing.add(f.path);

  const newFiles = [];
  for (const p of paths) {
    if (existing.has(p)) continue;
    existing.add(p);
    const name = p.split('\\').pop().split('/').pop();
    newFiles.push({ path: p, name, size: null });
  }
  if (newFiles.length > 0) {
    _pendingFiles.push(...newFiles);
    openHosterModal();
  }
}

function updateUploadView() {
  const dropZone = document.getElementById('dropZone');
  const queueShell = document.getElementById('queueShell');
  const queueActions = document.getElementById('queueActions');

  if (selectedFiles.length === 0 && queueJobs.length === 0) {
    dropZone.style.display = 'flex';
    queueShell.style.display = 'none';
    queueActions.style.display = 'none';
  } else {
    dropZone.style.display = 'none';
    queueShell.style.display = 'flex';
    queueActions.style.display = 'flex';
    if (!uploading && selectedFiles.length > 0) {
      buildQueuePreview();
    }
  }
  updateQueueActionButtons();
}

function updateStartButton() {
  const btn = document.getElementById('startUploadBtn');
  const hosters = getSelectedHosters();
  const hasQueuedJobs = queueJobs.some(isStartableQueueJob);
  const canBuildQueueFromSelection = selectedFiles.length > 0 && hosters.length > 0;
  btn.disabled = uploading || !(hasQueuedJobs || canBuildQueueFromSelection);
}

const _UPLOAD_SELECTION_STATUSES = new Set(['done', 'error', 'aborted', 'skipped']);
const _ABORT_SELECTION_STATUSES = new Set(['preview', 'queued', 'getting-server', 'uploading', 'retrying']);

function updateQueueActionButtons() {
  updateStartButton();

  const hasSelection = selectedJobIds.size > 0;
  // Single pass over the (usually small) selection set instead of three O(n)
  // scans over the entire queue. For 1000 jobs × 3 scans this drops the
  // selection-change cost from ~3000 checks to |selection|.
  let hasUploadSelection = false, hasAbortSelection = false, hasStartableSelection = false;
  for (const id of selectedJobIds) {
    const job = _jobIndexById.get(id);
    if (!job) continue;
    const s = job.status;
    if (!hasUploadSelection && _UPLOAD_SELECTION_STATUSES.has(s)) hasUploadSelection = true;
    if (!hasAbortSelection && _ABORT_SELECTION_STATUSES.has(s)) hasAbortSelection = true;
    if (!hasStartableSelection && isStartableQueueStatus(s)) hasStartableSelection = true;
    if (hasUploadSelection && hasAbortSelection && hasStartableSelection) break;
  }
  const hasMovableSelection = hasSelection && !uploading;

  const startSelectedBtn = document.getElementById('startSelectedBtn');
  const reuploadBtn = document.getElementById('reuploadSelectedBtn');
  const abortSelectedBtn = document.getElementById('abortSelectedBtn');
  const finishStopBtn = document.getElementById('finishStopBtn');
  const abortAllBtn = document.getElementById('abortAllBtn');
  const moveTopBtn = document.getElementById('moveTopBtn');
  const moveUpBtn = document.getElementById('moveUpBtn');
  const moveDownBtn = document.getElementById('moveDownBtn');
  const moveBottomBtn = document.getElementById('moveBottomBtn');

  if (startSelectedBtn) startSelectedBtn.disabled = uploading || !hasStartableSelection;
  if (reuploadBtn) reuploadBtn.disabled = !hasUploadSelection;
  if (abortSelectedBtn) abortSelectedBtn.disabled = !hasAbortSelection;
  if (finishStopBtn) finishStopBtn.disabled = !uploading;
  if (abortAllBtn) abortAllBtn.disabled = !uploading;
  if (moveTopBtn) moveTopBtn.disabled = !hasMovableSelection;
  if (moveUpBtn) moveUpBtn.disabled = !hasMovableSelection;
  if (moveDownBtn) moveDownBtn.disabled = !hasMovableSelection;
  if (moveBottomBtn) moveBottomBtn.disabled = !hasMovableSelection;
}

// Build preview jobs from selected files x selected hosters (before upload starts)
function buildQueuePreview() {
  const hosters = getSelectedHosters();
  if (hosters.length === 0) {
    queueJobs = queueJobs.filter(j => j.status !== 'preview');
    rebuildJobIndex();
    renderQueueTable();
    persistQueueStateSoon();
    return;
  }
  // Remove old preview jobs
  queueJobs = queueJobs.filter(j => j.status !== 'preview');

  // Build a Set for fast existence checks
  const existingKeys = new Set();
  for (const j of queueJobs) {
    if (j.status !== 'error') existingKeys.add(`${j.file}|${j.hoster}`);
  }

  for (const file of selectedFiles) {
    for (const hoster of hosters) {
      const key = `${file.path}|${hoster}`;
      if (!existingKeys.has(key) && !_completedUploadKeys.has(key)) {
        const job = {
          id: `preview-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
          file: file.path, fileName: file.name, hoster,
          status: 'preview', bytesUploaded: 0, bytesTotal: file.size || 0,
          speedKbs: 0, elapsed: 0, remaining: 0,
          error: null, result: null, attempt: 0, maxAttempts: 0, link: ''
        };
        queueJobs.push(job);
        existingKeys.add(key);
      }
    }
  }
  rebuildJobIndex();
  renderQueueTable();
  persistQueueStateSoon();
}

// --- Job Index Management ---
function rebuildJobIndex() {
  _jobIndexById.clear();
  _jobIndexByUploadId.clear();
  for (const job of queueJobs) {
    _jobIndexById.set(job.id, job);
    if (job.uploadId) _jobIndexByUploadId.set(job.uploadId, job);
  }
}

function indexJob(job) {
  _jobIndexById.set(job.id, job);
  if (job.uploadId) _jobIndexByUploadId.set(job.uploadId, job);
}

function removeJobFromIndex(job) {
  _jobIndexById.delete(job.id);
  if (job.uploadId) _jobIndexByUploadId.delete(job.uploadId);
  // Track deletion so handleProgress() won't re-create this job from stale callbacks
  _deletedJobIds.add(job.id);
  if (job.uploadId) _deletedJobIds.add(job.uploadId);
  // Allow re-uploading same file+hoster after deletion
  if (job.file && job.hoster) _completedUploadKeys.delete(`${job.file}|${job.hoster}`);
}

// --- Queue Table Rendering (debounced with virtual scrolling) ---
let _renderQueued = false;
let _sortedJobsCache = [];
const VIRTUAL_ROW_HEIGHT = 28;
const VIRTUAL_OVERSCAN = 10;
let _lastVisibleRange = { start: -1, end: -1 };
let _queueListenersBound = false;

// Throttled UI update scheduling – max one render per 200ms during uploads
let _uiUpdateTimer = null;
const UI_UPDATE_INTERVAL = 200; // ms

function scheduleQueueRender() {
  if (_renderQueued) return;
  _renderQueued = true;
  requestAnimationFrame(() => { _renderQueued = false; renderQueueTable(); });
}

let _recentRenderQueued = false;
function scheduleRecentRender() {
  if (_recentRenderQueued) return;
  _recentRenderQueued = true;
  requestAnimationFrame(() => { _recentRenderQueued = false; renderRecentUploadsPanel(); });
}

// Toggle the .selected class on existing rows without rebuilding the table.
// Used on click/selection changes — O(rendered rows) instead of O(total rows × sort).
// Uses getElementsByClassName for the live HTMLCollection (DOM-cached after the
// first call, auto-tracks insertions/removals on tbody) instead of running a
// fresh querySelectorAll on every click. At 200 visible rows that's the
// difference between paying for a tree walk per click vs reading a memoized
// list that the engine already maintains.
function applyQueueSelectionClasses() {
  const tbody = document.getElementById('queueBody');
  if (!tbody) return;
  const rows = tbody.getElementsByClassName('queue-row');
  for (let i = 0; i < rows.length; i++) {
    const tr = rows[i];
    tr.classList.toggle('selected', selectedJobIds.has(tr.dataset.jobId));
  }
}

function applyRecentSelectionClasses() {
  const tbody = document.getElementById('recentFilesBody');
  if (!tbody) return;
  const rows = tbody.getElementsByClassName('recent-file-row');
  for (let i = 0; i < rows.length; i++) {
    const tr = rows[i];
    const order = parseInt(tr.dataset.order, 10);
    tr.classList.toggle('selected', selectedRecentIds.has(order));
  }
}

function scheduleThrottledUIUpdate() {
  if (_uiUpdateTimer) return;
  _uiUpdateTimer = setTimeout(() => {
    _uiUpdateTimer = null;
    scheduleQueueRender();
    updateQueueActionButtons();
    updateStatusBar();
    updateStatsPanel();
  }, UI_UPDATE_INTERVAL);
}

// Coalesces status-change updates (done/error/retrying/queued/…) into one
// frame. Without this, a batch of 500 jobs flipping queued→getting-server
// →uploading synchronously fires 1500+ updateStatusBar/Buttons/Stats calls
// and janks the renderer. rAF caps it to ~60 Hz.
let _statusChangeUpdateQueued = false;
function scheduleStatusChangeUpdate() {
  if (_statusChangeUpdateQueued) return;
  _statusChangeUpdateQueued = true;
  requestAnimationFrame(() => {
    _statusChangeUpdateQueued = false;
    renderQueueTable();
    updateQueueActionButtons();
    updateStatusBar();
    updateStatsPanel();
  });
}

function buildRowHtml(job) {
  const statusClass = `status-${job.status}`;
  const rowClass = `queue-row ${statusClass}${selectedJobIds.has(job.id) ? ' selected' : ''}`;
  const uploadedSize = job.status === 'preview'
    ? (job.bytesTotal > 0 ? formatSize(job.bytesTotal) : '...')
    : `${formatSize(job.bytesUploaded)} / ${formatSize(job.bytesTotal)}`;
  const statusText = getStatusText(job);
  const elapsed = formatTime(job.elapsed);
  const remaining = formatTime(job.remaining);
  const speed = job.speedKbs > 0 ? `${formatSpeed(job.speedKbs)}` : '';
  const pct = Math.min(100, Math.round((job.progress || 0) * 100));
  const link = job.result ? (job.result.download_url || job.result.embed_url || '') : '';

  return `<tr class="${rowClass}" data-job-id="${job.id}" data-link="${escapeAttr(link)}" style="height:${VIRTUAL_ROW_HEIGHT}px">
    <td class="col-filename" title="${escapeAttr(job.fileName)}">${escapeHtml(job.fileName)}</td>
    <td class="col-size">${uploadedSize}</td>
    <td class="col-host">${escapeHtml(job.hoster)}</td>
    <td class="col-status"><span class="status-badge ${statusClass}">${escapeHtml(statusText)}</span></td>
    <td class="col-elapsed">${elapsed}</td>
    <td class="col-remaining">${remaining}</td>
    <td class="col-speed">${speed}</td>
    <td class="col-progress">
      <div class="progress-cell">
        <div class="progress-bar-bg">
          <div class="progress-bar-fill ${statusClass}" style="width:${pct}%"></div>
        </div>
        <span class="progress-pct">${job.status === 'preview' ? '' : pct + '%'}</span>
      </div>
    </td>
  </tr>`;
}

// In-place update of a single row's cells (avoids full innerHTML rebuild)
function _updateRowInPlace(tr, job) {
  const statusClass = `status-${job.status}`;
  const uploadedSize = job.status === 'preview'
    ? (job.bytesTotal > 0 ? formatSize(job.bytesTotal) : '...')
    : `${formatSize(job.bytesUploaded)} / ${formatSize(job.bytesTotal)}`;
  const statusText = getStatusText(job);
  const elapsed = formatTime(job.elapsed);
  const remaining = formatTime(job.remaining);
  const speed = job.speedKbs > 0 ? `${formatSpeed(job.speedKbs)}` : '';
  const pct = Math.min(100, Math.round((job.progress || 0) * 100));
  const link = job.result ? (job.result.download_url || job.result.embed_url || '') : '';

  // Write DOM only when the target value actually changes — a no-op progress
  // tick (same pct, same speed) then performs zero DOM work. Massive saver
  // when most of the visible jobs are idle/queued/done and only a few are
  // actively uploading.
  const newClass = `queue-row ${statusClass}${selectedJobIds.has(job.id) ? ' selected' : ''}`;
  if (tr.className !== newClass) tr.className = newClass;
  if (tr.dataset.link !== link) tr.dataset.link = link;

  const cells = tr.children;
  if (cells.length < 8) return false; // structure mismatch, needs full rebuild

  if (cells[1].textContent !== uploadedSize) cells[1].textContent = uploadedSize;
  // cells[0] (filename) and cells[2] (hoster) don't change during upload
  const badge = cells[3].querySelector('.status-badge');
  if (badge) {
    const badgeClass = `status-badge ${statusClass}`;
    if (badge.className !== badgeClass) badge.className = badgeClass;
    if (badge.textContent !== statusText) badge.textContent = statusText;
  }
  if (cells[4].textContent !== elapsed) cells[4].textContent = elapsed;
  if (cells[5].textContent !== remaining) cells[5].textContent = remaining;
  if (cells[6].textContent !== speed) cells[6].textContent = speed;

  const fill = cells[7].querySelector('.progress-bar-fill');
  if (fill) {
    const pctStr = pct + '%';
    if (fill.style.width !== pctStr) fill.style.width = pctStr;
    const fillClass = `progress-bar-fill ${statusClass}`;
    if (fill.className !== fillClass) fill.className = fillClass;
  }
  const pctSpan = cells[7].querySelector('.progress-pct');
  if (pctSpan) {
    const pctText = job.status === 'preview' ? '' : pct + '%';
    if (pctSpan.textContent !== pctText) pctSpan.textContent = pctText;
  }

  return true;
}

function renderQueueTable() {
  const tbody = document.getElementById('queueBody');
  if (!tbody) return;

  _sortedJobsCache = sortQueueJobs(queueJobs);
  const totalRows = _sortedJobsCache.length;

  if (totalRows < 200) {
    // Try in-place update if row count matches (fast path)
    const existingRows = tbody.querySelectorAll('.queue-row');
    if (existingRows.length === totalRows && totalRows > 0) {
      // In-place update – no DOM destruction
      for (let i = 0; i < totalRows; i++) {
        const tr = existingRows[i];
        const job = _sortedJobsCache[i];
        // If row identity changed (different job), fall back to full rebuild
        if (tr.dataset.jobId !== job.id) {
          tbody.innerHTML = _sortedJobsCache.map(buildRowHtml).join('');
          _lastVisibleRange = { start: -1, end: -1 };
          break;
        }
        _updateRowInPlace(tr, job);
      }
    } else {
      // Full rebuild needed (row count changed)
      tbody.innerHTML = _sortedJobsCache.map(buildRowHtml).join('');
      _lastVisibleRange = { start: -1, end: -1 };
    }
  } else {
    // Virtual scrolling for large queues — in-place update when range unchanged
    _renderVirtualRows(tbody);
  }

  // Bind event delegation once
  if (!_queueListenersBound) {
    _queueListenersBound = true;
    tbody.addEventListener('click', (e) => {
      const row = e.target.closest('.queue-row');
      if (row) handleRowClick(e, row);
    });
    tbody.addEventListener('contextmenu', (e) => {
      const row = e.target.closest('.queue-row');
      if (row) handleRowContextMenu(e, row);
    });
  }

  // Update retry button visibility
  const hasFailedJobs = queueJobs.some(j => j.status === 'error');
  document.getElementById('retryFailedBtn').style.display = hasFailedJobs ? 'inline-block' : 'none';
  updateQueueActionButtons();
}

function _renderVirtualRows(tbody) {
  const scrollContainer = document.getElementById('queueContainer');
  if (!scrollContainer) return;

  const totalRows = _sortedJobsCache.length;
  const scrollTop = scrollContainer.scrollTop;
  // Use a minimum viewport height to avoid rendering nothing when container is being laid out
  const viewportHeight = Math.max(scrollContainer.clientHeight, 200);

  const startIdx = Math.max(0, Math.floor(scrollTop / VIRTUAL_ROW_HEIGHT) - VIRTUAL_OVERSCAN);
  const endIdx = Math.min(totalRows, Math.ceil((scrollTop + viewportHeight) / VIRTUAL_ROW_HEIGHT) + VIRTUAL_OVERSCAN);

  // Same range — try in-place update to avoid hover flicker
  if (startIdx === _lastVisibleRange.start && endIdx === _lastVisibleRange.end) {
    const rows = tbody.querySelectorAll('.queue-row');
    if (rows.length === endIdx - startIdx) {
      let allMatch = true;
      for (let i = 0; i < rows.length; i++) {
        const job = _sortedJobsCache[startIdx + i];
        if (rows[i].dataset.jobId !== job.id) { allMatch = false; break; }
        _updateRowInPlace(rows[i], job);
      }
      if (allMatch) return; // all rows updated in-place, no rebuild needed
    }
  }
  _lastVisibleRange = { start: startIdx, end: endIdx };

  const topPad = startIdx * VIRTUAL_ROW_HEIGHT;
  const bottomPad = Math.max(0, (totalRows - endIdx) * VIRTUAL_ROW_HEIGHT);

  let html = '';
  if (topPad > 0) html += `<tr class="virtual-spacer" style="height:${topPad}px"><td colspan="8"></td></tr>`;
  for (let i = startIdx; i < endIdx; i++) {
    html += buildRowHtml(_sortedJobsCache[i]);
  }
  if (bottomPad > 0) html += `<tr class="virtual-spacer" style="height:${bottomPad}px"><td colspan="8"></td></tr>`;

  tbody.innerHTML = html;
}

// Coalesce rapid scroll events (a fast trackpad fling fires dozens) into one
// render per frame. rAF keeps the scroll thread cheap.
let _queueScrollQueued = false;
function _onQueueScroll() {
  if (_queueScrollQueued) return;
  if (_sortedJobsCache.length < 200) return;
  _queueScrollQueued = true;
  requestAnimationFrame(() => {
    _queueScrollQueued = false;
    const tbody = document.getElementById('queueBody');
    if (tbody) _renderVirtualRows(tbody);
  });
}

const _collatorDE = new Intl.Collator('de', { sensitivity: 'base', numeric: true });
const _collatorSimple = new Intl.Collator('de');

// Queue sort memoization. Keys that don't change after a job enters the queue
// (filename, host) reuse the cached result across progress-driven re-renders.
// Dynamic keys (status/speed/progress) AND size (which goes 0 → actual when
// previews resolve / upload starts) are recomputed each call — otherwise a
// queue sorted by size during previews would be stuck in all-zeros order.
//
// CRITICAL: the cache also tracks jobsRef (identity of the queueJobs array) so
// that a full replacement (e.g. backup import, queue restore) invalidates the
// cache. Length alone can match across a replace and would otherwise pin the
// renderer to stale job references — the UI freezes showing old statuses even
// though queueJobs itself has fresh objects. Observed as "upload runs in
// status bar but all rows stay 'Bereit'" after importing a backup.
let _queueSortCache = { sig: '', result: [], jobsRef: null };
const _STATIC_SORT_KEYS = new Set(['filename', 'host']);

// Dynamic-key sort throttle: status/speed/progress/size change on every
// progress tick, so a strict per-call sort is O(N log N) per render. Within
// one UI_UPDATE_INTERVAL window (200ms), reuse the previous sort even if it's
// slightly out of order — the user can't perceive sub-200ms reorder lag, and
// at 5000 queued jobs this is the difference between smooth and stuttering.
// Uses lib/throttled-cache.js (see tests/throttled-cache.test.js).
const DYNAMIC_SORT_REFRESH_MS = 200;
const _dynamicSortCache = window.ThrottledCache
  ? window.ThrottledCache.makeThrottledCache(DYNAMIC_SORT_REFRESH_MS)
  : { get: () => undefined, set: (s, i, v) => v, clear: () => {} };

function sortQueueJobs(jobs) {
  const { key, direction } = queueSortState;
  const factor = direction === 'asc' ? 1 : -1;
  const canCache = _STATIC_SORT_KEYS.has(key);
  const sig = canCache ? `${key}|${direction}|${jobs.length}` : '';
  if (sig && _queueSortCache.sig === sig && _queueSortCache.jobsRef === jobs) {
    return _queueSortCache.result;
  }
  // Dynamic-key throttle: same key+direction+array, sorted within the last
  // 200ms → reuse. The cache is keyed by `key|direction` and uses the jobs
  // array identity as the input ref, so a fresh queueJobs (e.g. after
  // backup import) misses correctly.
  if (!canCache) {
    const dynSig = `${key}|${direction}`;
    const cached = _dynamicSortCache.get(dynSig, jobs);
    if (cached) return cached;
  }

  const sorted = jobs.slice().sort((a, b) => {
    let cmp = 0;
    if (key === 'filename') cmp = _collatorDE.compare(a.fileName, b.fileName);
    else if (key === 'size') cmp = (a.bytesTotal || 0) - (b.bytesTotal || 0);
    else if (key === 'host') cmp = _collatorSimple.compare(a.hoster, b.hoster);
    else if (key === 'status') cmp = getStatusOrder(a.status) - getStatusOrder(b.status);
    else if (key === 'speed') cmp = (a.speedKbs || 0) - (b.speedKbs || 0);
    else if (key === 'progress') cmp = (a.progress || 0) - (b.progress || 0);
    return cmp * factor;
  });
  if (sig) _queueSortCache = { sig, result: sorted, jobsRef: jobs };
  else _dynamicSortCache.set(`${key}|${direction}`, jobs, sorted);
  return sorted;
}

function getStatusOrder(status) {
  const order = { uploading: 0, 'getting-server': 1, retrying: 2, queued: 3, preview: 4, done: 5, aborted: 6, error: 7, skipped: 8 };
  return order[status] ?? 4;
}

// "Primär" / "Fallback #1" / "Fallback #2"… derived from the job's current
// accountId position in the configured hoster account list. Returns '' if we
// can't resolve it (e.g. account was removed mid-session).
function getAccountLabel(job) {
  if (!job || !job.accountId || !job.hoster) return '';
  const accounts = config && config.hosters && config.hosters[job.hoster];
  if (!Array.isArray(accounts)) return '';
  const idx = accounts.findIndex(a => a && a.id === job.accountId);
  if (idx < 0) return '';
  return idx === 0 ? 'Primär' : `Fallback #${idx}`;
}

function getStatusText(job) {
  const shortErr = job.error ? String(job.error).replace(/\s+/g, ' ').slice(0, 100) : '';
  const acc = getAccountLabel(job);
  const accSuffix = acc ? ` · ${acc}` : '';
  switch (job.status) {
    case 'preview': return 'Bereit';
    case 'queued': return 'Wartet';
    case 'getting-server': return `Server...${accSuffix}`;
    case 'uploading': return `Upload${accSuffix}`;
    case 'retrying': {
      const base = `Retry ${job.attempt}/${job.maxAttempts}${accSuffix}`;
      return shortErr ? `${base}: ${shortErr}` : base;
    }
    case 'done': return 'Fertig';
    case 'aborted': return 'Abgebrochen';
    case 'error': return shortErr ? `Fehlgeschlagen: ${shortErr}` : 'Fehlgeschlagen';
    case 'skipped': return shortErr ? `Übersprungen: ${shortErr}` : 'Übersprungen';
    default: return job.status;
  }
}

// --- Queue interactions ---
function handleRowClick(e, row) {
  const jobId = row.dataset.jobId;
  // Clear recent panel selection when clicking in queue — class-toggle only.
  if (selectedRecentIds.size > 0) { selectedRecentIds.clear(); applyRecentSelectionClasses(); }

  if (e.ctrlKey || e.metaKey) {
    if (selectedJobIds.has(jobId)) selectedJobIds.delete(jobId);
    else selectedJobIds.add(jobId);
  } else if (e.shiftKey && selectedJobIds.size > 0) {
    // Use sorted jobs cache for correct shift-click with virtual scrolling
    const sortedIds = _sortedJobsCache.map(j => j.id);
    const lastIdx = sortedIds.findIndex(id => selectedJobIds.has(id));
    const curIdx = sortedIds.indexOf(jobId);
    if (lastIdx >= 0 && curIdx >= 0) {
      const from = Math.min(lastIdx, curIdx);
      const to = Math.max(lastIdx, curIdx);
      for (let i = from; i <= to; i++) selectedJobIds.add(sortedIds[i]);
    }
  } else {
    selectedJobIds.clear();
    selectedJobIds.add(jobId);
    // Single click on done job -> copy link
    const job = _jobIndexById.get(jobId);
    if (job && job.status === 'done' && job.result) {
      const link = job.result.download_url || job.result.embed_url || '';
      if (link) {
        window.api.copyToClipboard(link);
        showCopyToast('Link kopiert');
      }
    }
  }
  // Selection changes don't change sort order / row content — just toggle classes.
  applyQueueSelectionClasses();
  updateQueueActionButtons();
}

// --- Context menu ---
let alwaysOnTopState = false;

// Cache hoster-counts for the context menu. Invalidated on structural changes
// to queueJobs (the length-based signature is good enough — a job's hoster
// never changes after it's created).
let _hosterCountsCache = { sig: '', result: new Map() };
function _getHosterCounts() {
  const sig = `${queueJobs.length}`;
  if (_hosterCountsCache.sig === sig) return _hosterCountsCache.result;
  const m = new Map();
  for (let i = 0; i < queueJobs.length; i++) {
    const h = queueJobs[i].hoster;
    m.set(h, (m.get(h) || 0) + 1);
  }
  _hosterCountsCache = { sig, result: m };
  return m;
}

function handleRowContextMenu(e, row) {
  e.preventDefault();
  const jobId = row.dataset.jobId;
  if (!selectedJobIds.has(jobId)) {
    selectedJobIds.clear();
    selectedJobIds.add(jobId);
    applyQueueSelectionClasses();
    updateQueueActionButtons();
  }
  showContextMenu(e.clientX, e.clientY);
}

function showContextMenu(x, y) {
  const menu = document.getElementById('contextMenu');
  // Update "Always on top" text
  const aotItem = menu.querySelector('[data-action="always-on-top"]');
  if (aotItem) aotItem.textContent = alwaysOnTopState ? 'Immer im Vordergrund ✓' : 'Immer im Vordergrund';
  // Update labels with selection count
  const n = selectedJobIds.size;
  const delItem = menu.querySelector('[data-action="delete-selected"]');
  if (delItem) delItem.textContent = n > 1 ? `Entfernen (${n})` : 'Entfernen';
  const copyItem = menu.querySelector('[data-action="copy-links"]');
  if (copyItem) copyItem.textContent = n > 1 ? `Links kopieren (${n})` : 'Link kopieren';
  menu.querySelectorAll('[data-action="retry-selected"]').forEach(el => {
    el.textContent = n > 1 ? `Erneut versuchen (${n})` : 'Erneut versuchen';
  });
  const startItem = menu.querySelector('[data-action="start-selected"]');
  if (startItem) startItem.textContent = n > 1 ? `Ausgewählte starten (${n})` : 'Ausgewählte starten';

  // Dynamic "delete by hoster" submenu — cached count keyed by queue length
  // so a right-click on a 5000-job queue doesn't rescan everything.
  const deleteHosterSubmenu = menu.querySelector('.ctx-hoster-delete-submenu');
  const deleteHosterContainer = menu.querySelector('.ctx-hoster-delete-items');
  const hosterCounts = _getHosterCounts();
  deleteHosterContainer.innerHTML = '';
  if (hosterCounts.size > 0) {
    deleteHosterSubmenu.style.display = '';
    hosterCounts.forEach((count, hoster) => {
      const item = document.createElement('div');
      item.className = 'ctx-item ctx-item-danger';
      item.dataset.action = `delete-hoster:${hoster}`;
      item.textContent = `${getHosterLabel(hoster)} (${count})`;
      deleteHosterContainer.appendChild(item);
    });
  } else {
    deleteHosterSubmenu.style.display = 'none';
  }

  menu.style.display = 'block';
  const menuX = Math.min(x, window.innerWidth - menu.offsetWidth - 5);
  menu.style.left = menuX + 'px';
  menu.style.top = Math.min(y, window.innerHeight - menu.offsetHeight - 5) + 'px';

  // Flip submenus if they would overflow the viewport right edge
  menu.querySelectorAll('.ctx-submenu-items').forEach(sub => {
    // Temporarily show to measure actual width (display:none → offsetWidth=0)
    sub.style.visibility = 'hidden';
    sub.style.display = 'block';
    sub.classList.toggle('flip-left', menuX + menu.offsetWidth + sub.offsetWidth > window.innerWidth);
    sub.style.display = '';
    sub.style.visibility = '';
  });
}

function hideContextMenu() {
  document.getElementById('contextMenu').style.display = 'none';
  document.getElementById('recentContextMenu').style.display = 'none';
}

function deleteSelectedRecentFiles() {
  if (selectedRecentIds.size === 0) return;
  let removedDone = 0, removedErr = 0;
  sessionFilesData = sessionFilesData.filter(r => {
    if (!selectedRecentIds.has(r.order)) return true;
    if (r.isError) removedErr++; else removedDone++;
    _sessionFileKeys.delete(`${r.link}\u0001${r.filename}\u0001${r.host}`);
    return false;
  });
  _sessionDoneCount = Math.max(0, _sessionDoneCount - removedDone);
  _sessionErrorCount = Math.max(0, _sessionErrorCount - removedErr);
  selectedRecentIds.clear();
  renderRecentUploadsPanel();
}

function clearAllRecentFiles() {
  if (sessionFilesData.length === 0) return;
  if (!confirm(`Wirklich alle ${sessionFilesData.length} Links aus diesem Panel entfernen?`)) return;
  sessionFilesData = [];
  _sessionFileKeys.clear();
  _sessionDoneCount = 0;
  _sessionErrorCount = 0;
  selectedRecentIds.clear();
  renderRecentUploadsPanel();
}

async function exportAllRecentFiles() {
  if (sessionFilesData.length === 0) {
    alert('Keine Einträge zum Exportieren.');
    return;
  }
  const rows = sortRecentFiles(sessionFilesData);
  const header = 'timestamp|hoster|link|filename|status';
  const lines = rows.map(r => {
    const ts = r.timestamp || r.time || '';
    const host = r.host || r.hoster || '';
    const link = r.link || '';
    const name = r.filename || '';
    const status = r.isError ? 'error' : 'ok';
    return [ts, host, link, name, status].map(v => String(v).replace(/[\r\n|]/g, ' ')).join('|');
  });
  const content = [header, ...lines].join('\n') + '\n';
  const defaultName = `uploads-${new Date().toISOString().slice(0, 10)}.log`;
  try {
    const result = await window.api.saveTextFile(defaultName, content, [
      { name: 'Log-Datei', extensions: ['log', 'txt', 'csv'] }
    ]);
    if (result && result.ok) showCopyToast(`${rows.length} Einträge exportiert`);
  } catch (err) {
    alert('Export fehlgeschlagen: ' + (err.message || err));
  }
}

function copySelectedRecentLinks() {
  const links = sessionFilesData
    .filter(r => selectedRecentIds.has(r.order) && !r.isError)
    .map(r => r.link)
    .filter(Boolean);
  if (links.length) { window.api.copyToClipboard(links.join('\n')); showCopyToast(`${links.length} Links kopiert`); }
}

// --- Backup export / import ---
async function doBackupExport() {
  try {
    const result = await window.api.exportBackup();
    if (result && result.ok) showCopyToast('Backup exportiert');
  } catch (err) {
    alert('Export fehlgeschlagen: ' + (err.message || err));
  }
}

function askLegacyBackupPassword(hint) {
  return new Promise((resolve) => {
    const overlay = document.createElement('div');
    overlay.className = 'modal-overlay';
    overlay.style.display = 'flex';

    const card = document.createElement('div');
    card.className = 'modal-card';
    card.style.width = 'min(380px,100%)';

    const header = document.createElement('div');
    header.className = 'modal-header';
    const h3 = document.createElement('h3');
    h3.textContent = 'Backup nicht entschlüsselbar';
    header.appendChild(h3);

    const body = document.createElement('div');
    body.className = 'modal-body';
    const p = document.createElement('p');
    p.style.margin = '0 0 10px';
    p.style.fontSize = '13px';
    p.textContent = 'Wenn das Backup mit der alten Passwort-Option (vor v3.0) erstellt wurde, hier eingeben.';
    if (hint) {
      const p2 = document.createElement('p');
      p2.style.margin = '0 0 10px';
      p2.style.fontSize = '12px';
      p2.style.color = 'var(--text-dim)';
      p2.textContent = hint;
      body.appendChild(p2);
    }
    const input = document.createElement('input');
    input.type = 'password';
    input.className = 'key-input';
    input.placeholder = 'Passwort';
    input.autocomplete = 'off';
    input.style.width = '100%';
    body.appendChild(p);
    body.appendChild(input);

    const footer = document.createElement('div');
    footer.className = 'modal-footer';
    const cancelBtn = document.createElement('button');
    cancelBtn.className = 'btn btn-secondary';
    cancelBtn.textContent = 'Abbrechen';
    const okBtn = document.createElement('button');
    okBtn.className = 'btn btn-primary';
    okBtn.textContent = 'Importieren';
    footer.appendChild(cancelBtn);
    footer.appendChild(okBtn);

    card.appendChild(header);
    card.appendChild(body);
    card.appendChild(footer);
    overlay.appendChild(card);
    document.body.appendChild(overlay);

    const done = (val) => { overlay.remove(); resolve(val); };
    okBtn.onclick = () => done(input.value || null);
    cancelBtn.onclick = () => done(null);
    input.addEventListener('keydown', (e) => {
      if (e.key === 'Enter') done(input.value || null);
      if (e.key === 'Escape') done(null);
    });
    input.focus();
  });
}

async function doBackupImport(legacyPassword) {
  const pw = typeof legacyPassword === 'string' ? legacyPassword : undefined;
  try {
    const result = await window.api.importBackup(pw);
    if (!result || result.canceled) return;
    if (result.needsPassword) {
      const entered = await askLegacyBackupPassword(result.hint);
      if (entered) doBackupImport(entered);
      return;
    }
    if (result.ok) {
      config = result.config;
      hosterSettings = config.hosterSettings || {};
      alwaysOnTopState = !!(config.globalSettings && config.globalSettings.alwaysOnTop);
      window.api.setAlwaysOnTop(alwaysOnTopState);
      renderSettings();
      renderAccounts();
      renderHosterSummary();
      renderHosterModal();
      loadHistory();
      showCopyToast('Backup importiert');
    } else if (result.error) {
      alert('Import fehlgeschlagen: ' + result.error);
    }
  } catch (err) {
    alert('Import fehlgeschlagen: ' + (err.message || err));
  }
}

document.addEventListener('click', (e) => {
  if (!e.target.closest('.context-menu')) hideContextMenu();
});
document.addEventListener('keydown', (e) => {
  if (e.key === 'Escape') {
    hideContextMenu();
    cancelHosterModal();
  }
  if (e.target.closest('input, textarea, select')) return;
  const activeView = document.querySelector('.view.active');
  // Ctrl+A
  if ((e.ctrlKey || e.metaKey) && e.key === 'a') {
    if (activeView && activeView.id === 'upload-view') {
      e.preventDefault();
      // Select recent files only if user's last interaction was in the recent panel
      if (selectedRecentIds.size > 0 && selectedJobIds.size === 0) {
        sessionFilesData.forEach(r => selectedRecentIds.add(r.order));
        renderRecentUploadsPanel();
      } else if (queueJobs.length > 0) {
        queueJobs.forEach(j => selectedJobIds.add(j.id));
        renderQueueTable();
      }
    }
  }
  // Delete
  if (e.key === 'Delete') {
    if (activeView && activeView.id === 'upload-view') {
      e.preventDefault();
      if (selectedRecentIds.size > 0) {
        deleteSelectedRecentFiles();
      } else if (selectedJobIds.size > 0) {
        const deletedIds = [...selectedJobIds];
        // Cancel active uploads for deleted jobs
        const activeIds = deletedIds.filter(id => {
          const j = _jobIndexById.get(id);
          return j && (j.status === 'uploading' || j.status === 'queued' || j.status === 'retrying' || j.status === 'getting-server');
        });
        if (activeIds.length > 0) window.api.cancelSelectedJobs(activeIds);
        queueJobs = queueJobs.filter(j => {
          if (selectedJobIds.has(j.id)) { removeJobFromIndex(j); return false; }
          return true;
        });
        selectedJobIds.clear();
        syncSelectedFilesFromQueue();
        renderQueueTable();
        if (queueJobs.length === 0) { selectedFiles = []; updateUploadView(); }
        updateStatusBar();
        persistQueueStateSoon(true);
      }
    }
  }
});

document.getElementById('contextMenu').addEventListener('click', (e) => {
  const item = e.target.closest('.ctx-item');
  if (!item) return;
  const action = item.dataset.action;
  if (!action) return;
  hideContextMenu();
  handleContextAction(action);
});

async function handleContextAction(action) {
  if (action === 'start-selected') {
    startSelectedUpload();
  } else if (action === 'copy-links') {
    const links = getSelectedJobLinks();
    if (links.length) { window.api.copyToClipboard(links.join('\n')); showCopyToast(`${links.length} Links kopiert`); }
  } else if (action === 'retry-selected') {
    retrySelectedJobs();
  } else if (action === 'show-log') {
    showJobLogModal();
  } else if (action === 'delete-selected') {
    // Cancel active uploads for deleted jobs
    const activeIds = [...selectedJobIds].filter(id => {
      const j = _jobIndexById.get(id);
      return j && (j.status === 'uploading' || j.status === 'queued' || j.status === 'retrying' || j.status === 'getting-server');
    });
    if (activeIds.length > 0) window.api.cancelSelectedJobs(activeIds);
    queueJobs = queueJobs.filter(j => {
      if (selectedJobIds.has(j.id)) {
        removeJobFromIndex(j);
        return false;
      }
      return true;
    });
    selectedJobIds.clear();
    syncSelectedFilesFromQueue();
    renderQueueTable();
    if (queueJobs.length === 0) { selectedFiles = []; updateUploadView(); }
    updateStatusBar();
    persistQueueStateSoon(true);
  } else if (action === 'copy-all-links') {
    copyAllLinks();
  } else if (action === 'delete-all') {
    // Cancel all active uploads
    const activeIds = queueJobs
      .filter(j => j.status === 'uploading' || j.status === 'queued' || j.status === 'retrying' || j.status === 'getting-server')
      .map(j => j.id);
    if (activeIds.length > 0) window.api.cancelSelectedJobs(activeIds);
    queueJobs.forEach(j => removeJobFromIndex(j));
    queueJobs = [];
    selectedJobIds.clear();
    selectedFiles = [];
    syncSelectedFilesFromQueue();
    renderQueueTable();
    updateUploadView();
    updateStatusBar();
    persistQueueStateSoon(true);
  } else if (action === 'always-on-top') {
    alwaysOnTopState = !alwaysOnTopState;
    await window.api.setAlwaysOnTop(alwaysOnTopState);
  } else if (action.startsWith('delete-hoster:')) {
    const hoster = action.replace('delete-hoster:', '');
    // Cancel active uploads for this hoster
    const activeIds = queueJobs
      .filter(j => j.hoster === hoster && (j.status === 'uploading' || j.status === 'queued' || j.status === 'retrying' || j.status === 'getting-server' || j.status === 'preview'))
      .map(j => j.id);
    if (activeIds.length > 0) await window.api.cancelSelectedJobs(activeIds);
    // Remove ALL jobs for this hoster
    queueJobs = queueJobs.filter(j => {
      if (j.hoster === hoster) { removeJobFromIndex(j); return false; }
      return true;
    });
    selectedJobIds.clear();
    syncSelectedFilesFromQueue();
    renderQueueTable();
    if (queueJobs.length === 0) { selectedFiles = []; updateUploadView(); }
    updateStatusBar();
    updateQueueActionButtons();
    persistQueueStateSoon(true);
  } else if (action.startsWith('shutdown-')) {
    const mode = action.replace('shutdown-', '');
    await window.api.setShutdownAfterFinish(mode);
  }
}

function getSelectedJobLinks() {
  return queueJobs
    .filter(j => selectedJobIds.has(j.id) && j.status === 'done' && j.result)
    .map(j => j.result.download_url || j.result.embed_url || '')
    .filter(Boolean);
}

// --- Upload ---
async function startUpload() {
  if (uploading) return;
  uploading = true; // set immediately to prevent double-click race
  updateQueueActionButtons();

  const hosters = getSelectedHosters();
  if (queueJobs.length === 0 && selectedFiles.length > 0) {
    if (hosters.length === 0) {
      alert('Bitte mindestens einen Hoster auswählen.');
      uploading = false;
      updateQueueActionButtons();
      return;
    }
    buildQueuePreview();
  }

  const jobsToStart = queueJobs.filter((job) => isStartableQueueStatus(job.status));
  if (jobsToStart.length === 0) { uploading = false; updateQueueActionButtons(); return; }

  try {
    jobsToStart.forEach(j => {
      j.status = 'queued';
      j.error = null;
      j.result = null;
      j.bytesUploaded = 0;
      j.speedKbs = 0;
      j.elapsed = 0;
      j.remaining = 0;
      j.progress = 0;
      j.uploadId = null;
    });
    updateQueueActionButtons();
    renderQueueTable();
    updateStatusBar();

    const uploadPayload = {
      hosters,
      jobs: jobsToStart.map((job) => ({
        id: job.id,
        file: job.file,
        fileName: job.fileName,
        hoster: job.hoster
      }))
    };
    const result = await window.api.startUpload(uploadPayload);
    _markSkippedJobs(result);
    persistQueueStateSoon();

    if (result && result.error) {
      alert(result.error);
      uploading = false;
      updateQueueActionButtons();
      updateStatusBar();
    }
  } catch (err) {
    uploading = false;
    updateQueueActionButtons();
    updateStatusBar();
    alert(`Upload-Start fehlgeschlagen: ${err.message}`);
  }
}

function _markSkippedJobs(result) {
  if (!result || !Array.isArray(result.skippedJobs) || result.skippedJobs.length === 0) return;
  for (const skipped of result.skippedJobs) {
    const job = _jobIndexById.get(skipped.jobId);
    if (job) {
      job.status = 'error';
      job.error = skipped.reason || 'Kein gültiger Account';
    }
  }
  renderQueueTable();
}

async function startSelectedUpload() {
  if (uploading) {
    // Batch already running — add selected jobs (queued/error/aborted/skipped) to running batch
    // Upload-manager has duplicate protection (skips jobs already tracked)
    const addable = queueJobs.filter(j => selectedJobIds.has(j.id) && ['queued', 'error', 'aborted', 'skipped'].includes(j.status));
    if (addable.length > 0) {
      addable.forEach(j => {
        j.status = 'queued'; j.error = null; j.result = null;
        j.bytesUploaded = 0; j.speedKbs = 0; j.progress = 0; j.uploadId = null;
      });
      renderQueueTable();
      let result = null;
      try {
        result = await window.api.addJobsToBatch({
          jobs: addable.map(j => ({ id: j.id, file: j.file, fileName: j.fileName, hoster: j.hoster }))
        });
      } catch (err) {
        showCopyToast(`Jobs konnten nicht hinzugefuegt werden: ${err.message}`);
        return;
      }

      // If the batch ended between UI-state and IPC call, start a fresh batch immediately
      if (result && result.error === 'Kein Upload aktiv') {
        uploading = false;
        updateQueueActionButtons();
        updateStatusBar();
        await startSelectedUpload();
        return;
      }
      _markSkippedJobs(result);
      persistQueueStateSoon();
      const added = Number(result && result.added) || 0;
      // Use ASCII-only toast text here to avoid encoding artifacts on some systems.
      const skipped = Array.isArray(result && result.skippedJobs) ? result.skippedJobs.length : 0;
      const alreadyInBatch = Array.isArray(result && result.alreadyInBatchJobIds)
        ? result.alreadyInBatchJobIds.length
        : Math.max(0, addable.length - added - skipped);
      const toastParts = [];
      if (added > 0) toastParts.push(`${added} hinzugefuegt`);
      if (alreadyInBatch > 0) toastParts.push(`${alreadyInBatch} bereits im Batch`);
      if (skipped > 0) toastParts.push(`${skipped} ohne gueltigen Account`);
      if (result && result.error) {
        showCopyToast(`Jobs konnten nicht hinzugefuegt werden: ${result.error}`);
      } else if (toastParts.length > 0) {
        showCopyToast(`Jobs: ${toastParts.join(', ')}`);
      } else {
        showCopyToast('Keine Jobs hinzugefuegt');
      }
      return;
    }
    return;
  }
  uploading = true; // set immediately to prevent double-click race
  updateQueueActionButtons();

  const hosters = getSelectedHosters();
  const jobsToStart = queueJobs.filter((job) => selectedJobIds.has(job.id) && isStartableQueueStatus(job.status));
  if (jobsToStart.length === 0) { uploading = false; updateQueueActionButtons(); return; }

  try {
    jobsToStart.forEach(j => {
      j.status = 'queued';
      j.error = null;
      j.result = null;
      j.bytesUploaded = 0;
      j.speedKbs = 0;
      j.progress = 0;
      j.uploadId = null;
    });
    updateQueueActionButtons();
    renderQueueTable();
    updateStatusBar();

    const uploadPayload = {
      hosters,
      jobs: jobsToStart.map((job) => ({
      id: job.id,
      file: job.file,
      fileName: job.fileName,
      hoster: job.hoster
    }))
  };
    const result = await window.api.startUpload(uploadPayload);
    _markSkippedJobs(result);
    persistQueueStateSoon();

    if (result && result.error) {
      alert(result.error);
      uploading = false;
      updateQueueActionButtons();
      updateStatusBar();
    }
  } catch (err) {
    uploading = false;
    updateQueueActionButtons();
    updateStatusBar();
    alert(`Upload-Start fehlgeschlagen: ${err.message}`);
  }
}

async function cancelUpload() {
  await window.api.cancelUpload();
  uploading = false;
  // Reset all non-finished jobs back to queued state
  for (const job of queueJobs) {
    if (!['done', 'error', 'skipped'].includes(job.status)) {
      job.status = 'queued';
      job.progress = 0;
      job.bytesUploaded = 0;
      job.speedKbs = 0;
      job.elapsed = 0;
      job.remaining = 0;
      job.error = null;
    }
  }
  renderQueueTable();
  updateQueueActionButtons();
  updateStatusBar();
  persistQueueStateSoon();
}

// --- Progress handling ---
function handleProgress(data) {
  let job = data.jobId ? _jobIndexById.get(data.jobId) : null;
  if (!job && data.uploadId) job = _jobIndexByUploadId.get(data.uploadId);
  if (!job) {
    job = queueJobs.find(j =>
      j.fileName === data.fileName && j.hoster === data.hoster && j.status === 'queued'
    ) || queueJobs.find(j =>
      j.fileName === data.fileName && j.hoster === data.hoster && j.status === 'preview'
    );
    if (job && data.uploadId) {
      job.uploadId = data.uploadId;
      _jobIndexByUploadId.set(data.uploadId, job);
    }
  }
  if (!job) {
    // Don't re-create jobs that were explicitly deleted by the user
    if ((data.jobId && _deletedJobIds.has(data.jobId)) || (data.uploadId && _deletedJobIds.has(data.uploadId))) {
      return;
    }
    job = {
      id: data.jobId || data.uploadId || `job-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`,
      uploadId: data.uploadId,
      file: '', fileName: data.fileName, hoster: data.hoster,
      status: data.status, bytesUploaded: 0, bytesTotal: data.bytesTotal || 0,
      speedKbs: 0, elapsed: 0, remaining: 0,
      error: null, result: null, attempt: 0, maxAttempts: 0, link: ''
    };
    queueJobs.push(job);
    indexJob(job);
  }

  // Don't regress from terminal states (stale callbacks can arrive after completion)
  if (job.status === 'done' || job.status === 'skipped') return;

  // Update job state
  job.status = data.status;
  job.bytesUploaded = data.bytesUploaded || 0;
  job.bytesTotal = data.bytesTotal || job.bytesTotal;
  // Track session total bytes (survives removeFromQueueOnDone)
  if (job.bytesTotal > 0 && !_sessionTrackedJobs.has(job.id)) {
    _sessionTotalBytes += job.bytesTotal;
    _sessionTrackedJobs.add(job.id);
  }
  job.speedKbs = data.speedKbs || 0;
  job.elapsed = data.elapsed || 0;
  job.remaining = data.remaining || 0;
  job.error = data.error || null;
  job.result = data.result || job.result;
  job.attempt = data.attempt || 0;
  job.maxAttempts = data.maxAttempts || 0;
  job.progress = data.progress || 0;
  // Track which account the backend is currently using so the status cell
  // can display "Primär" vs "Fallback #N" during rotation.
  if (data.accountId) job.accountId = data.accountId;
  if (data.uploadId) {
    job.uploadId = data.uploadId;
    _jobIndexByUploadId.set(data.uploadId, job);
  }

  maybeAddSessionFile(job);

  // Track session uploaded bytes (survives removeFromQueueOnDone)
  if (job.status === 'done' && !_sessionDoneJobs.has(job.id)) {
    _sessionUploadedBytes += job.bytesTotal || 0;
    _sessionDoneJobs.add(job.id);
  }

  // Track completed uploads so they don't get re-queued after removal
  if (job.status === 'done') {
    _completedUploadKeys.add(`${job.file}|${job.hoster}`);
  }

  // Remove finished jobs from queue if setting is enabled. Coalesce the
  // actual array filter into one microtask: a burst of 500 done events
  // would otherwise fire 500 individual O(N) filters = O(N²) work, visible
  // as a brief UI freeze when a big batch finishes. Index/selection are
  // updated synchronously so subsequent lookups see the right state — only
  // the array rewrite is deferred.
  if (job.status === 'done' && config.globalSettings && config.globalSettings.removeFromQueueOnDone) {
    removeJobFromIndex(job);
    selectedJobIds.delete(job.id);
    if (_doneRemovalCoalescer) {
      _doneRemovalCoalescer.add(job.id);
    } else {
      // Legacy slow path: immediate filter when the lib script didn't load.
      queueJobs = queueJobs.filter(j => j !== job);
    }
  }

  // Status changes (done/error/etc) get one coalesced update per frame so a
  // burst of 500 parallel jobs flipping state doesn't fire 2000 sync DOM
  // updates. Ongoing uploading progress is throttled at 200ms.
  if (data.status === 'uploading') {
    scheduleThrottledUIUpdate();
  } else {
    scheduleStatusChangeUpdate();
  }
  persistQueueStateSoon();
}

function handleBatchDone(summary) {
  uploading = false;
  applySummaryResults(summary);
  _deletedJobIds.clear(); // Free memory — stale IDs no longer needed after batch completes
  // Prune session-stats sets to current queue contents. Without this, IDs
  // of jobs that were removed from queueJobs (via removeFromQueueOnDone
  // or the cap-prune below) live forever in these sets — small leak per
  // entry, real over weeks of use. _completedUploadKeys is intentionally
  // kept (it's the dedup against re-queueing the same file).
  if (_sessionTrackedJobs.size > 0 || _sessionDoneJobs.size > 0) {
    const aliveIds = new Set();
    for (const j of queueJobs) aliveIds.add(j.id);
    for (const id of _sessionTrackedJobs) if (!aliveIds.has(id)) _sessionTrackedJobs.delete(id);
    for (const id of _sessionDoneJobs) if (!aliveIds.has(id)) _sessionDoneJobs.delete(id);
  }

  // Reset aborted jobs back to queued so they can be restarted
  for (const job of queueJobs) {
    if (job.status === 'aborted') {
      job.status = 'queued';
      job.progress = 0;
      job.bytesUploaded = 0;
      job.speedKbs = 0;
      job.elapsed = 0;
      job.remaining = 0;
      job.error = null;
    }
  }

  syncSelectedFilesFromQueue();
  updateQueueActionButtons();
  renderQueueTable();
  renderRecentUploadsPanel();
  // History is only visible on the Verlauf tab. Mark it dirty and refresh when
  // the user actually switches to it — skips an IPC + full table rebuild per
  // batch-done when the user is watching the upload view.
  _historyDirty = true;
  if (_isHistoryTabActive()) loadHistory();

  const removeOnDone = config.globalSettings && config.globalSettings.removeFromQueueOnDone;
  if (removeOnDone) {
    // Single pass: build the keep-list and clean up the index for removed jobs.
    const nextJobs = [];
    for (const job of queueJobs) {
      if (job.status === 'done') {
        removeJobFromIndex(job);
        selectedJobIds.delete(job.id);
      } else {
        nextJobs.push(job);
      }
    }
    queueJobs = nextJobs;
    renderQueueTable();
  } else {
    // Auto-prune for the default (removeOnDone=false) too: cap terminal
    // jobs (done/skipped/error/aborted) at the most recent N so the queue
    // can't grow unbounded across long sessions. The algorithm lives in
    // lib/queue-prune.js (same impl Node-tested, see tests/queue-prune.test.js)
    // and the result tells us which jobs to drop so we can clean up the
    // index + selection in one pass.
    const TERMINAL_KEEP_LIMIT = 500;
    // Optional-chain so the renderer still works if the prune script fails
    // to load (e.g. file:// path issues during dev) — falls back to no-prune
    // rather than crashing on every batch-done.
    const result = window.QueuePrune?.pruneOldestTerminalJobs(queueJobs, TERMINAL_KEEP_LIMIT);
    if (result) {
      for (const j of result.dropped) {
        removeJobFromIndex(j);
        selectedJobIds.delete(j.id);
      }
      queueJobs = result.kept;
      renderQueueTable();
    }
  }

  if (queueJobs.some((job) => !['done', 'skipped'].includes(job.status))) persistQueueStateSoon(true);
  else clearPersistedQueueStateSoon();

  lastUploadStats = { state: 'idle', globalSpeedKbs: 0, totalBytes: lastUploadStats.totalBytes, elapsed: lastUploadStats.elapsed, activeJobs: 0 };
  updateStatusBar();
  _maybeShowBatchSummary(summary);
  _refreshSessionFailedSnapshot();
}

let _sessionFailedKeys = new Set();
async function _refreshSessionFailedSnapshot() {
  if (!window.api || !window.api.getSessionFailedAccounts) return;
  try {
    const keys = await window.api.getSessionFailedAccounts();
    _sessionFailedKeys = new Set(Array.isArray(keys) ? keys : []);
    renderAccounts();
  } catch { /* ignore */ }
}

function _maybeShowBatchSummary(summary) {
  if (!window.Stats || !summary) return;
  const buckets = window.Stats.summarizeBatchErrors(summary);
  const total = Object.values(buckets).reduce((n, arr) => n + arr.length, 0);
  if (total === 0) return;

  const modal = document.getElementById('batchSummaryModal');
  if (!modal) return;
  const list = modal.querySelector('#batchSummaryList');
  const retryAllBtn = modal.querySelector('#batchSummaryRetryAll');
  const retryTransientBtn = modal.querySelector('#batchSummaryRetryTransient');
  const closeBtn = modal.querySelector('#batchSummaryClose');

  const order = ['hoster-transient', 'network', 'unknown', 'file-rejected', 'account-error', 'aborted'];
  list.innerHTML = order
    .filter(cat => buckets[cat].length > 0)
    .map(cat => {
      const items = buckets[cat];
      const sample = items.slice(0, 3).map(i => `<li>${escapeHtml(i.fileName)} → ${escapeHtml(i.hoster)}: <em>${escapeHtml(i.error)}</em></li>`).join('');
      const more = items.length > 3 ? `<li><em>… +${items.length - 3} weitere</em></li>` : '';
      const retryable = window.Stats.isRetryableCategory(cat);
      const tag = retryable ? '<span class="batch-cat-tag retryable">erneut versuchbar</span>' : '<span class="batch-cat-tag">manuell</span>';
      return `<div class="batch-cat" data-category="${escapeAttr(cat)}">
        <div class="batch-cat-head"><strong>${escapeHtml(window.Stats.CATEGORY_LABELS[cat] || cat)}</strong> <span class="batch-cat-count">${items.length}</span> ${tag}</div>
        <ul class="batch-cat-list">${sample}${more}</ul>
      </div>`;
    }).join('');

  const transientCount = ['hoster-transient', 'network', 'unknown'].reduce((n, c) => n + buckets[c].length, 0);
  retryTransientBtn.textContent = transientCount > 0 ? `Transiente erneut hochladen (${transientCount})` : 'Keine transienten Fehler';
  retryTransientBtn.disabled = transientCount === 0;
  const allRetryable = total - buckets['aborted'].length;
  retryAllBtn.textContent = `Alle Fehler erneut versuchen (${allRetryable})`;
  retryAllBtn.disabled = allRetryable === 0;

  const close = () => { modal.style.display = 'none'; };
  closeBtn.onclick = close;
  retryAllBtn.onclick = () => { _retryFailedFromBuckets(buckets, false); close(); };
  retryTransientBtn.onclick = () => { _retryFailedFromBuckets(buckets, true); close(); };
  modal.style.display = 'flex';
}

function _retryFailedFromBuckets(buckets, transientOnly) {
  const cats = transientOnly ? ['hoster-transient', 'network', 'unknown'] : ['hoster-transient', 'network', 'unknown', 'file-rejected', 'account-error'];
  const toRetry = [];
  for (const cat of cats) {
    for (const item of (buckets[cat] || [])) toRetry.push(item);
  }
  if (toRetry.length === 0) return;
  const jobsToRetry = [];
  for (const item of toRetry) {
    const job = queueJobs.find(j => (j.fileName === item.fileName) && (j.hoster === item.hoster) && (j.status === 'error' || j.status === 'skipped'));
    if (job) {
      job.status = 'queued';
      job.progress = 0;
      job.bytesUploaded = 0;
      job.error = null;
      job.result = null;
      jobsToRetry.push(job);
    }
  }
  if (jobsToRetry.length === 0) { showCopyToast('Keine passenden Jobs für Retry gefunden.'); return; }
  renderQueueTable();
  showCopyToast(`${jobsToRetry.length} Job(s) zum erneuten Upload zurückgesetzt`);
  if (typeof startUpload === 'function') startUpload();
}

function handleStats(data) {
  lastUploadStats = {
    state: data.state || 'idle',
    globalSpeedKbs: data.globalSpeedKbs || 0,
    totalBytes: data.totalBytes || 0,
    elapsed: data.elapsed || 0,
    activeJobs: data.activeJobs || 0
  };
  updateStatusBar();
  updateStatsPanel();

  // Track run time
  if (data.state === 'uploading' || data.state === 'stopping') {
    if (!statsStartTime) {
      statsStartTime = Date.now();
      statsRunTimer = setInterval(() => {
        const el = document.getElementById('statRunTime');
        if (el) el.textContent = formatDuration(Math.round((Date.now() - statsStartTime) / 1000));
      }, 1000);
    }
  } else if (data.state === 'idle' && statsRunTimer) {
    clearInterval(statsRunTimer);
    statsRunTimer = null;
  }
}

// --- Per-job log modal ---
async function showJobLogModal() {
  if (selectedJobIds.size === 0) return;
  // Use the first selected job — log view is per-file, multi-select doesn't
  // make sense here.
  const jobId = [...selectedJobIds][0];
  const job = _jobIndexById.get(jobId);
  const modal = document.getElementById('jobLogModal');
  const titleEl = document.getElementById('jobLogTitle');
  const bodyEl = document.getElementById('jobLogBody');
  if (!modal || !titleEl || !bodyEl) return;

  titleEl.textContent = job && job.fileName ? `Log · ${job.fileName}` : 'Upload-Log';
  bodyEl.textContent = 'Lade…';
  modal.style.display = 'flex';

  let entries = [];
  try { entries = await window.api.getJobLog(jobId); } catch {}

  if (!Array.isArray(entries) || entries.length === 0) {
    bodyEl.textContent = 'Keine Log-Einträge für diesen Job (entweder noch nichts passiert oder aus vorherigem Batch und schon geräumt).';
    return;
  }

  const fmt = (e) => {
    const t = new Date(e.ts || Date.now()).toLocaleTimeString('de-DE', { hour12: false }) + '.' +
      String((e.ts || 0) % 1000).padStart(3, '0');
    if (e.kind === 'progress') {
      const attempt = e.attempt ? ` (${e.attempt}/${e.maxAttempts || '?'})` : '';
      const acc = e.accountId ? ` acc=${e.accountId.slice(0, 32)}` : '';
      const err = e.error ? `\n    → ${e.error}` : '';
      return `[${t}] status=${e.status}${attempt}${acc}${err}`;
    }
    // rot-log
    const rest = Object.entries(e)
      .filter(([k]) => !['ts', 'kind', 'event', 'jobId'].includes(k))
      .map(([k, v]) => `${k}=${typeof v === 'string' ? v : JSON.stringify(v)}`)
      .join(' ');
    return `[${t}] [${e.event}] ${rest}`;
  };
  bodyEl.textContent = entries.map(fmt).join('\n');
}

function hideJobLogModal() {
  const m = document.getElementById('jobLogModal');
  if (m) m.style.display = 'none';
}

async function copyJobLogToClipboard() {
  const body = document.getElementById('jobLogBody');
  if (!body || !body.textContent) return;
  try { await window.api.copyToClipboard(body.textContent); showCopyToast('Log in Zwischenablage'); } catch {}
}

// --- Retry ---
async function retrySelectedJobs() {
  const retryJobs = [];
  // Build a Set for O(1) selectedFiles dedup below.
  const existingFilePaths = new Set();
  for (const f of selectedFiles) existingFilePaths.add(f.path);

  queueJobs.forEach(j => {
    if (selectedJobIds.has(j.id) && ['error', 'done', 'aborted', 'skipped'].includes(j.status)) {
      // Invalidate the old uploadId: retire the index entry and mark it so
      // any late progress event from the previous (cancelled/completed)
      // upload can't overwrite the freshly-reset state.
      if (j.uploadId) {
        _jobIndexByUploadId.delete(j.uploadId);
        _deletedJobIds.add(j.uploadId);
      }
      j.status = uploading ? 'queued' : 'preview';
      j.error = null;
      j.result = null;
      j.bytesUploaded = 0;
      j.speedKbs = 0;
      j.elapsed = 0;
      j.remaining = 0;
      j.progress = 0;
      j.uploadId = null;
      retryJobs.push(j);
      if (!existingFilePaths.has(j.file)) {
        selectedFiles.push({ path: j.file, name: j.fileName, size: j.bytesTotal });
        existingFilePaths.add(j.file);
      }
    }
  });
  if (retryJobs.length === 0) return;

  // Select the retry jobs and start them immediately.
  // No renderQueueTable / updateQueueActionButtons / updateStatusBar here:
  // startSelectedUpload() runs the exact same trio right after, and at 500+
  // jobs the double render freezes the UI for multiple seconds.
  selectedJobIds.clear();
  retryJobs.forEach(j => selectedJobIds.add(j.id));
  persistQueueStateSoon();
  await startSelectedUpload();
}

async function abortSelectedJobs() {
  const activeJobIds = [];

  queueJobs.forEach((job) => {
    if (!selectedJobIds.has(job.id)) return;

    if (['preview', 'queued'].includes(job.status)) {
      job.status = 'aborted';
      job.error = 'Abgebrochen';
      job.progress = 0;
      job.uploadId = null;
    } else if (['getting-server', 'uploading', 'retrying'].includes(job.status)) {
      activeJobIds.push(job.id);
    }
  });

  if (activeJobIds.length > 0) {
    await window.api.cancelSelectedJobs(activeJobIds);
  }

  selectedJobIds.clear();
  syncSelectedFilesFromQueue();
  renderQueueTable();
  updateQueueActionButtons();
  updateStatusBar();
  persistQueueStateSoon(true);
}

async function finishUploadsInProgress() {
  if (!uploading) return;
  await window.api.finishAfterActive();
  lastUploadStats.state = 'stopping';
  updateStatusBar();
}

async function abortAllUploads() {
  await cancelUpload();
}

function moveSelectedJobs(direction) {
  if (uploading || selectedJobIds.size === 0) return;

  const jobs = queueJobs.slice();

  if (direction === 'top') {
    queueJobs = jobs.filter((job) => selectedJobIds.has(job.id)).concat(jobs.filter((job) => !selectedJobIds.has(job.id)));
  } else if (direction === 'bottom') {
    queueJobs = jobs.filter((job) => !selectedJobIds.has(job.id)).concat(jobs.filter((job) => selectedJobIds.has(job.id)));
  } else if (direction === 'up') {
    for (let i = 1; i < jobs.length; i++) {
      if (selectedJobIds.has(jobs[i].id) && !selectedJobIds.has(jobs[i - 1].id)) {
        [jobs[i - 1], jobs[i]] = [jobs[i], jobs[i - 1]];
      }
    }
    queueJobs = jobs;
  } else if (direction === 'down') {
    for (let i = jobs.length - 2; i >= 0; i--) {
      if (selectedJobIds.has(jobs[i].id) && !selectedJobIds.has(jobs[i + 1].id)) {
        [jobs[i], jobs[i + 1]] = [jobs[i + 1], jobs[i]];
      }
    }
    queueJobs = jobs;
  }

  rebuildJobIndex();
  renderQueueTable();
  updateStatusBar();
  persistQueueStateSoon(true);
}

function syncSelectedFilesFromQueue() {
  const fileMap = new Map();
  queueJobs
    .filter((job) => !['done', 'skipped', 'aborted'].includes(job.status))
    .forEach((job) => {
      if (!job.file || fileMap.has(job.file)) return;
      fileMap.set(job.file, {
        path: job.file,
        name: job.fileName,
        size: job.bytesTotal || 0
      });
    });
  selectedFiles = Array.from(fileMap.values());
}

// Cap recent-files panel growth so a multi-thousand-job session doesn't
// turn every renderRecentUploadsPanel call into a multi-MB innerHTML write.
const SESSION_FILES_CAP = 2000;

function maybeAddSessionFile(job) {
  if (!job) return;

  const dt = formatDateTime(new Date());
  if (job.status === 'done' && job.result) {
    const link = job.result.download_url || job.result.embed_url || '';
    if (!link) return;
    const dedupKey = `${link}\u0001${job.fileName}\u0001${job.hoster}`;
    if (!_sessionFileKeys.has(dedupKey)) {
      _sessionFileKeys.add(dedupKey);
      sessionFilesData.push({
        date: dt.text,
        dateTs: dt.ts,
        filename: job.fileName || '',
        host: job.hoster || '',
        link,
        isError: false,
        order: sessionFilesData.length
      });
      _sessionDoneCount++;
      // Drop oldest entries past the cap to keep render cost bounded.
      // Without this, sessionFilesData grows unbounded across the session
      // and every renderRecentUploadsPanel call becomes a megabyte-sized
      // innerHTML write — visible as scroll/click lag in the lower panel.
      if (sessionFilesData.length > SESSION_FILES_CAP) {
        const drop = sessionFilesData.length - SESSION_FILES_CAP;
        for (let i = 0; i < drop; i++) {
          const r = sessionFilesData[i];
          _sessionFileKeys.delete(`${r.link}
${r.filename}
${r.host}`);
        }
        sessionFilesData = sessionFilesData.slice(drop);
      }
      // Coalesce rapid successive adds into one render per frame.
      scheduleRecentRender();
    }
  }

}

function applySummaryResults(summary) {
  const files = Array.isArray(summary?.files) ? summary.files : [];
  // Build a (fileName + hoster) → job map once so the per-result lookup is O(1)
  // instead of O(|queueJobs|). Big batches (hundreds of files × multiple hosters)
  // otherwise become O(n²).
  const jobByKey = new Map();
  for (const j of queueJobs) {
    jobByKey.set(`${j.fileName}\u0001${j.hoster}`, j);
  }
  for (const file of files) {
    for (const result of file.results || []) {
      const job = jobByKey.get(`${file.name}\u0001${result.hoster}`);
      if (!job) continue;
      if (result.status === 'done') {
        job.status = 'done';
        job.result = {
          download_url: result.download_url || null,
          embed_url: result.embed_url || null,
          file_code: result.file_code || null
        };
        job.error = null;
        job.progress = 1;
        job.bytesUploaded = job.bytesTotal || file.size || 0;
      } else if (result.status === 'aborted') {
        job.status = 'aborted';
        job.error = result.error || 'Abgebrochen';
      } else if (result.status === 'error') {
        job.status = 'error';
        job.error = result.error || 'Fehlgeschlagen';
      }
      maybeAddSessionFile(job);
    }
  }
}

// Single-pass queue stats computation (shared by status bar + stats panel).
// Also tracks inProgressBytes so the status bar doesn't need a second scan.
//
// Memoized within a single tick: back-to-back calls (updateStatusBar +
// updateStatsPanel fire together 4×/sec during upload) share one scan. The
// cache is cleared on microtask so the next tick picks up fresh state.
let _queueStatsCache = null;
function _computeQueueStats() {
  if (_queueStatsCache) return _queueStatsCache;

  let remaining = 0, inProgress = 0, done = 0, errors = 0;
  let bytesRemaining = 0, totalSize = 0, remainingSize = 0, inProgressBytes = 0;
  const total = queueJobs.length;

  for (let i = 0; i < total; i++) {
    const job = queueJobs[i];
    const s = job.status;
    const bt = job.bytesTotal || 0;
    const bu = job.bytesUploaded || 0;
    totalSize += bt;

    if (s === 'uploading' || s === 'getting-server' || s === 'retrying') {
      inProgress++;
      remaining++;
      inProgressBytes += bu;
      bytesRemaining += Math.max(0, bt - bu);
      remainingSize += Math.max(0, bt - bu);
    } else if (s === 'preview' || s === 'queued') {
      remaining++;
      bytesRemaining += Math.max(0, bt - bu);
      remainingSize += Math.max(0, bt - bu);
    } else if (s === 'done') {
      done++;
    } else if (s === 'error') {
      errors++;
    } else if (s !== 'skipped') {
      remainingSize += Math.max(0, bt - bu);
    }
  }

  _queueStatsCache = { total, remaining, inProgress, done, errors, bytesRemaining, totalSize, remainingSize, inProgressBytes };
  queueMicrotask(() => { _queueStatsCache = null; });
  return _queueStatsCache;
}

function updateStatusBar() {
  const stats = _computeQueueStats();

  const etaSeconds = lastUploadStats.globalSpeedKbs > 0
    ? Math.round(stats.bytesRemaining / (lastUploadStats.globalSpeedKbs * 1024))
    : 0;

  const stateText = lastUploadStats.state === 'uploading'
    ? 'Upload läuft...'
    : lastUploadStats.state === 'stopping'
      ? 'Stoppt nach aktiven Uploads...'
      : uploading
        ? 'Upload vorbereitet...'
        : 'Bereit';

  document.getElementById('sbState').textContent = stateText;
  document.getElementById('sbSpeed').textContent = formatSpeed(lastUploadStats.globalSpeedKbs || 0);
  const uploadedSize = _sessionUploadedBytes + stats.inProgressBytes;
  const totalSize = Math.max(stats.totalSize, _sessionTotalBytes);
  document.getElementById('sbTotal').textContent = `${formatSize(uploadedSize)} / ${formatSize(totalSize)}`;
  document.getElementById('sbEta').textContent = `ETA ${etaSeconds > 0 ? formatTime(etaSeconds) : '--:--'}`;
  document.getElementById('sbConnections').textContent = `Connections: ${lastUploadStats.activeJobs || 0}`;
  document.getElementById('sbQueueCount').textContent = `Total: ${stats.total}`;
  document.getElementById('sbRemainingCount').textContent = `Remaining: ${stats.remaining}`;
  document.getElementById('sbInProgressCount').textContent = `In Progress: ${stats.inProgress}`;
  document.getElementById('sbDoneCount').textContent = `Done: ${_sessionDoneCount}`;
  document.getElementById('sbErrorCount').textContent = `Error: ${_sessionErrorCount}`;
}

// --- Health Check ---

function renderHealthCheckResults(_results) {
  const container = document.getElementById('healthCheckResults');
  if (container) container.innerHTML = '';
}

async function executeHealthCheck(hosters, _mode) {
  renderHealthCheckResults([]);
  const result = await window.api.runHealthCheck({ hosters });
  const rows = result && Array.isArray(result.results) ? result.results : [];
  rows.forEach((row) => {
    if (!row) return;
    const key = row.accountId || row.hoster;
    if (key) {
      accountStatuses[key] = {
        status: row.status || 'unchecked',
        message: row.message || ''
      };
    }
  });
  renderHealthCheckResults(rows);
  renderAccounts();
  renderHosterModal();
  return rows;
}

async function runHealthCheck(mode = 'manual', requestedHosters = null) {
  if (healthCheckRunning) {
    if (mode === 'manual') showCopyToast('Account-Check läuft bereits.');
    return [];
  }
  let hosters;
  if (Array.isArray(requestedHosters) && requestedHosters.length > 0) {
    hosters = requestedHosters;
  } else {
    hosters = getAccountsWithCredsFlat()
      .filter(({ account }) => account.enabled !== false)
      .map(({ name, account }) => ({ hoster: name, accountId: account.id }));
  }
  if (hosters.length === 0) {
    if (mode === 'manual') alert('Keine Hoster mit Zugangsdaten für einen Check.');
    return [];
  }
  healthCheckRunning = true;
  // Mark all accounts as checking
  for (const h of hosters) {
    const key = typeof h === 'string' ? h : (h.accountId || h.hoster);
    accountStatuses[key] = { status: 'checking', message: '' };
  }
  renderAccounts();
  try {
    return await executeHealthCheck(hosters, mode);
  } catch (err) {
    renderHealthCheckResults([{ hoster: 'System', status: 'error', message: err.message }]);
    return [];
  } finally {
    healthCheckRunning = false;
    renderAccounts();
  }
}

// --- Settings ---
async function _renderLogPathsList(el) {
  if (!el || !window.api || !window.api.getLogPaths) return;
  try {
    const paths = await window.api.getLogPaths();
    if (!paths || typeof paths !== 'object') { el.innerHTML = '<span class="hint">Pfade nicht verfügbar.</span>'; return; }
    const entries = [
      ['fileuploader', 'fileuploader.log'],
      ['debug', 'debug.log'],
      ['accountRotation', 'account-rotation.log'],
      ['doodstreamDebug', 'doodstream-debug.log']
    ];
    el.innerHTML = entries.map(([key, label]) => {
      const p = paths[key] || '';
      return `<div style="display:flex;gap:6px;align-items:center;font-size:11px">
        <span style="min-width:160px;color:var(--text-dim)">${escapeHtml(label)}</span>
        <code style="flex:1;font-size:10px;opacity:0.85;overflow:hidden;text-overflow:ellipsis;white-space:nowrap" title="${escapeAttr(p)}">${escapeHtml(p) || '<nicht gesetzt>'}</code>
        <button class="btn btn-xs btn-secondary" data-reveal-log="${escapeAttr(key)}" title="Im Explorer zeigen">Zeigen</button>
      </div>`;
    }).join('');
    el.querySelectorAll('[data-reveal-log]').forEach(btn => {
      btn.addEventListener('click', () => {
        const target = btn.getAttribute('data-reveal-log');
        if (window.api && window.api.revealLogFile) window.api.revealLogFile(target).catch(() => {});
      });
    });
  } catch (err) {
    el.innerHTML = `<span class="hint">Fehler: ${escapeHtml(err.message || String(err))}</span>`;
  }
}

function renderSettings() {
  const container = document.getElementById('settingsHosters');
  container.innerHTML = '';

  const globalSettings = config.globalSettings || {};
  const configuredAccounts = getAvailableHosters();
  const generalPanel = document.createElement('div');
  generalPanel.className = 'hoster-settings-panel';
  generalPanel.innerHTML = `
    <div class="hoster-panel-header" data-hoster="global">
      <span class="panel-arrow">&#9660;</span>
      <span class="panel-title">Allgemein</span>
      <span class="panel-status active">System</span>
    </div>
    <div class="hoster-panel-body" data-panel="global" style="display:block">
      <div class="settings-section-label">Uploads</div>
        <div class="settings-row">
          <label style="min-width:185px">Globale parallele Uploads</label>
          <input type="number" class="hs-input settings-autosave" id="parallelUploadCountInput" value="${globalSettings.parallelUploadCount ?? 0}" min="0" max="100" style="width:80px">
          <span class="hint">0 = nur pro Hoster</span>
        </div>
        <div class="settings-row">
          <label style="min-width:185px">Globales Speed-Limit (MB/s)</label>
          <input type="number" class="hs-input settings-autosave" id="globalMaxSpeedMbsInput" value="${globalSettings.globalMaxSpeedKbs > 0 ? (globalSettings.globalMaxSpeedKbs / 1024).toFixed(2).replace(/\\.00$/, '') : '0'}" min="0" step="0.1" style="width:80px">
          <span class="hint">0 = unbegrenzt</span>
        </div>
      <div class="settings-section-label">Verhalten</div>
      <div class="settings-grid-mini">
        <div class="settings-row checkbox-row">
          <label>Immer im Vordergrund</label>
          <input type="checkbox" class="settings-autosave" id="alwaysOnTopInput" ${alwaysOnTopState ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Hoster-Limits hochskalieren</label>
          <input type="checkbox" class="settings-autosave" id="scaleParallelUploadsInput" ${globalSettings.scaleParallelUploads ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Aus Queue entfernen bei Abschluss</label>
          <input type="checkbox" class="settings-autosave" id="removeFromQueueOnDoneInput" ${globalSettings.removeFromQueueOnDone ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Queue beim Start wiederherstellen</label>
          <input type="checkbox" class="settings-autosave" id="resumeQueueOnLaunchInput" ${globalSettings.resumeQueueOnLaunch === false ? '' : 'checked'}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Drop-Target anzeigen</label>
          <input type="checkbox" class="settings-autosave" id="showDropTargetInput" ${globalSettings.showDropTarget ? 'checked' : ''}>
        </div>
      </div>
      <div class="settings-section-label">Updates</div>
      <div class="settings-row">
        <label>Manuell prüfen</label>
        <button class="btn btn-xs btn-secondary" id="manualUpdateCheckBtn">Nach Updates suchen</button>
      </div>
      <div class="settings-section-label">Log</div>
      <div class="settings-row">
        <label>FileUploader Log</label>
        <input type="text" class="key-input settings-autosave" id="logFilePathInput" value="${escapeAttr(globalSettings.logFilePath || '')}" placeholder="Standardpfad verwenden">
        <button class="btn btn-xs btn-secondary" id="chooseLogFilePathBtn">Ordner wählen</button>
        <button class="btn btn-xs btn-secondary" id="openLogFolderBtn" title="Log-Ordner im Explorer öffnen">Öffnen</button>
      </div>
      <div class="settings-row">
        <label>Log-Datei-Modus</label>
        <select class="hs-input settings-autosave" id="logModeInput">
          <option value="single" ${(window.LogMode ? window.LogMode.normalizeLogMode(globalSettings) : (globalSettings.logMode || 'single')) === 'single' ? 'selected' : ''}>Eine Datei</option>
          <option value="daily" ${(window.LogMode ? window.LogMode.normalizeLogMode(globalSettings) : (globalSettings.logMode || 'single')) === 'daily' ? 'selected' : ''}>Pro Tag</option>
          <option value="session" ${(window.LogMode ? window.LogMode.normalizeLogMode(globalSettings) : (globalSettings.logMode || 'single')) === 'session' ? 'selected' : ''}>Pro Session</option>
        </select>
        <span class="hint">Pro Session = neue Datei bei jedem App-Start; nach komplettem Schließen + erneutem Öffnen beginnt eine neue Session.</span>
      </div>
      <div class="settings-row">
        <label>Verbose Logging</label>
        <label class="checkbox-row" style="margin:0">
          <input type="checkbox" class="settings-autosave" id="logVerboseInput" ${globalSettings.logVerbose ? 'checked' : ''}>
          <span>DEBUG-Einträge in debug.log schreiben (Performance ↓, Diagnostik ↑)</span>
        </label>
      </div>
      <div class="settings-section-label">Diagnose</div>
      <div class="settings-row" id="logPathsBlock">
        <label>Log-Dateien</label>
        <div class="log-paths-list" id="logPathsList" style="flex:1;display:flex;flex-direction:column;gap:4px">
          <span class="hint">Wird geladen…</span>
        </div>
      </div>
      <div class="settings-row">
        <label>Support-Paket</label>
        <button class="btn btn-xs btn-secondary" id="createSupportBundleBtn" title="Sammelt alle Logs + sanitierte Config (Credentials maskiert) + App-Versionen in eine einzelne .txt-Datei zum Teilen.">Diagnose-Paket exportieren</button>
        <span class="hint" id="supportBundleHint">Eine .txt mit Logs + sanitierter Config; Passwörter/API-Keys werden vor dem Speichern maskiert.</span>
      </div>
    </div>
  `;
  container.appendChild(generalPanel);
  _renderLogPathsList(generalPanel.querySelector('#logPathsList'));
  const verboseInput = generalPanel.querySelector('#logVerboseInput');
  if (verboseInput) {
    verboseInput.addEventListener('change', () => {
      if (window.api && window.api.setLogVerbose) window.api.setLogVerbose(verboseInput.checked).catch(() => {});
    });
  }
  const sbBtn = generalPanel.querySelector('#createSupportBundleBtn');
  if (sbBtn) {
    sbBtn.addEventListener('click', async () => {
      const hint = generalPanel.querySelector('#supportBundleHint');
      sbBtn.disabled = true;
      const prevText = sbBtn.textContent;
      sbBtn.textContent = 'Exportiere…';
      try {
        const res = await window.api.createSupportBundle();
        if (res && res.ok) {
          if (hint) hint.textContent = `Gespeichert: ${res.path} (${(res.bytes/1024).toFixed(1)} KB)`;
        } else if (res && res.canceled) {
          if (hint) hint.textContent = 'Abgebrochen.';
        } else {
          if (hint) hint.textContent = `Fehler: ${(res && res.error) || 'unbekannt'}`;
        }
      } catch (err) {
        if (hint) hint.textContent = `Fehler: ${err.message || err}`;
      } finally {
        sbBtn.disabled = false;
        sbBtn.textContent = prevText;
      }
    });
  }

  // Toggle general panel
  generalPanel.querySelector('.hoster-panel-header').addEventListener('click', () => {
    const body = generalPanel.querySelector('.hoster-panel-body');
    const arrow = generalPanel.querySelector('.panel-arrow');
    const isOpen = body.style.display !== 'none';
    body.style.display = isOpen ? 'none' : 'block';
    arrow.innerHTML = isOpen ? '&#9654;' : '&#9660;';
  });

  // --- Folder Monitor Panel ---
  const fm = globalSettings.folderMonitor || {};
  const folderMonitorPanel = document.createElement('div');
  folderMonitorPanel.className = 'hoster-settings-panel';
  folderMonitorPanel.innerHTML = `
    <div class="hoster-panel-header" data-hoster="folderMonitor">
      <span class="panel-arrow">&#9654;</span>
      <span class="panel-title">Ordnerüberwachung</span>
      <span class="panel-status${fm.enabled && fm.folderPath ? ' active' : ''}" id="folderMonitorStatusBadge">${fm.enabled && fm.folderPath ? 'Aktiv' : 'Inaktiv'}</span>
    </div>
    <div class="hoster-panel-body" data-panel="folderMonitor" style="display:none">
      <div class="settings-section-label">Ordner</div>
      <div class="settings-row">
        <label>Ordnerpfad</label>
        <input type="text" class="key-input settings-autosave" id="fmFolderPathInput" value="${escapeAttr(fm.folderPath || '')}" placeholder="Ordner wählen..." style="flex:1">
        <button class="btn btn-xs btn-secondary" id="fmChooseFolderBtn">Wählen</button>
      </div>
      <div class="settings-row">
        <label>Dateierweiterungen</label>
        <select class="hs-input settings-autosave" id="fmFilterModeInput" style="width:auto;margin-right:6px">
          <option value="include" ${fm.filterMode === 'include' ? 'selected' : ''}>Nur diese</option>
          <option value="exclude" ${fm.filterMode === 'exclude' ? 'selected' : ''}>Alle außer</option>
        </select>
        <input type="text" class="key-input settings-autosave" id="fmExtensionsInput" value="${escapeAttr(fm.extensions || '')}" placeholder="mp4,mkv,avi" style="flex:1">
      </div>
      <div class="settings-row">
        <label>Verzögerung (Sekunden)</label>
        <input type="number" class="hs-input settings-autosave" id="fmDelaySecInput" value="${fm.delaySec ?? 3}" min="1" max="300" style="width:80px">
        <span class="hint">Warten bis Datei fertig geschrieben</span>
      </div>
      <div class="settings-section-label">Verhalten</div>
      <div class="settings-grid-mini">
        <div class="settings-row checkbox-row">
          <label>Aktiviert</label>
          <input type="checkbox" class="settings-autosave" id="fmEnabledInput" ${fm.enabled ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Unterordner einbeziehen</label>
          <input type="checkbox" class="settings-autosave" id="fmRecursiveInput" ${fm.recursive ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Duplikate überspringen</label>
          <input type="checkbox" class="settings-autosave" id="fmSkipDuplicatesInput" ${fm.skipDuplicates !== false ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Auto-Upload starten</label>
          <input type="checkbox" class="settings-autosave" id="fmAutoStartInput" ${fm.autoStart !== false ? 'checked' : ''}>
        </div>
      </div>
      <div class="settings-section-label">Hoster-Vorauswahl</div>
      <div class="settings-grid-mini">
        ${configuredAccounts.map(({ name }) => `
        <div class="settings-row checkbox-row">
          <label>${escapeHtml(name)}</label>
          <input type="checkbox" class="settings-autosave fm-hoster-checkbox" data-fm-hoster="${name}" ${(fm.hosters || []).includes(name) ? 'checked' : ''}>
        </div>`).join('')}
      </div>
      ${configuredAccounts.length === 0 ? '<p class="hint" style="margin:0">Erst Accounts anlegen, dann hier auswählen.</p>' : '<p class="hint" style="margin:2px 0 0">Keine Auswahl = Hoster-Modal bei jeder Datei.</p>'}
    </div>
  `;
  container.appendChild(folderMonitorPanel);

  // Toggle folder monitor panel
  folderMonitorPanel.querySelector('.hoster-panel-header').addEventListener('click', () => {
    const body = folderMonitorPanel.querySelector('.hoster-panel-body');
    const arrow = folderMonitorPanel.querySelector('.panel-arrow');
    const isOpen = body.style.display !== 'none';
    body.style.display = isOpen ? 'none' : 'block';
    arrow.innerHTML = isOpen ? '&#9654;' : '&#9660;';
  });

  // Update badge immediately on checkbox/path change
  const updateFmBadge = () => {
    const b = document.getElementById('folderMonitorStatusBadge');
    if (!b) return;
    const enabled = document.getElementById('fmEnabledInput')?.checked;
    const hasPath = (document.getElementById('fmFolderPathInput')?.value || '').trim();
    if (enabled && hasPath) { b.textContent = 'Aktiv'; b.className = 'panel-status active'; }
    else { b.textContent = 'Inaktiv'; b.className = 'panel-status'; }
  };
  document.getElementById('fmEnabledInput')?.addEventListener('change', updateFmBadge);
  document.getElementById('fmFolderPathInput')?.addEventListener('input', updateFmBadge);

  document.getElementById('fmChooseFolderBtn')?.addEventListener('click', async () => {
    const folder = await window.api.folderMonitorSelectFolder();
    if (folder) {
      document.getElementById('fmFolderPathInput').value = folder;
      updateFmBadge();
      scheduleSettingsSave();
    }
  });

  // --- Remote Control Panel ---
  const remoteSettings = globalSettings.remote || {};
  const remotePanel = document.createElement('div');
  remotePanel.className = 'hoster-settings-panel';
  remotePanel.innerHTML = `
    <div class="hoster-panel-header" data-hoster="remote">
      <span class="panel-arrow">&#9654;</span>
      <span class="panel-title">Fernsteuerung</span>
      <span class="panel-status${remoteSettings.enabled ? ' active' : ''}" id="remoteStatusBadge">${remoteSettings.enabled ? 'Aktiv' : 'Inaktiv'}</span>
    </div>
    <div class="hoster-panel-body" data-panel="remote" style="display:none">
      <div class="settings-section-label">Server</div>
      <div class="settings-grid-mini">
        <div class="settings-row checkbox-row">
          <label>Aktiviert</label>
          <input type="checkbox" class="settings-autosave" id="remoteEnabledInput" ${remoteSettings.enabled ? 'checked' : ''}>
        </div>
        <div class="settings-row checkbox-row">
          <label>Input erlauben</label>
          <input type="checkbox" class="settings-autosave" id="remoteAllowInputInput" ${remoteSettings.allowInput !== false ? 'checked' : ''}>
        </div>
      </div>
      <div class="settings-row">
        <label>Port</label>
        <input type="number" class="hs-input settings-autosave" id="remotePortInput" value="${remoteSettings.port || 9100}" min="1024" max="65535" style="width:100px">
      </div>
      <div class="settings-row">
        <label>API-Token</label>
        <input type="text" class="key-input" id="remoteTokenInput" value="${escapeAttr(remoteSettings.token || '')}" readonly style="flex:1">
        <button class="btn btn-xs btn-secondary" id="remoteCopyTokenBtn" title="Kopieren">Kopieren</button>
        <button class="btn btn-xs btn-secondary" id="remoteRegenerateTokenBtn" title="Neu generieren">Neu</button>
      </div>
      <div class="settings-section-label">Status</div>
      <div class="settings-row">
        <span id="remoteConnectionStatus" style="color:#94a3b8">Prüfe...</span>
      </div>
    </div>
  `;
  container.appendChild(remotePanel);

  // Toggle remote panel
  remotePanel.querySelector('.hoster-panel-header').addEventListener('click', () => {
    const body = remotePanel.querySelector('.hoster-panel-body');
    const arrow = remotePanel.querySelector('.panel-arrow');
    const isOpen = body.style.display !== 'none';
    body.style.display = isOpen ? 'none' : 'block';
    arrow.innerHTML = isOpen ? '&#9654;' : '&#9660;';
  });

  // Copy token
  document.getElementById('remoteCopyTokenBtn').addEventListener('click', async () => {
    const token = document.getElementById('remoteTokenInput').value;
    if (token) {
      await window.api.copyToClipboard(token);
      document.getElementById('remoteCopyTokenBtn').textContent = 'Kopiert!';
      setTimeout(() => { document.getElementById('remoteCopyTokenBtn').textContent = 'Kopieren'; }, 1500);
    }
  });

  // Regenerate token
  document.getElementById('remoteRegenerateTokenBtn').addEventListener('click', async () => {
    const newToken = await window.api.remoteGenerateToken();
    document.getElementById('remoteTokenInput').value = newToken;
    scheduleSettingsSave();
  });

  // Update status
  window.api.remoteStatus().then(status => {
    const el = document.getElementById('remoteConnectionStatus');
    if (!el) return;
    if (status.running) {
      el.textContent = `Aktiv auf Port ${status.port} — ${status.clientCount} Client(s) verbunden`;
      el.style.color = '#10b981';
    } else {
      el.textContent = 'Nicht aktiv';
      el.style.color = '#94a3b8';
    }
  }).catch(() => {});

  // Live client count updates (listener registered once in init, not here)

  // --- Backup Panel ---
  const backupPanel = document.createElement('div');
  backupPanel.className = 'hoster-settings-panel';
  backupPanel.innerHTML = `
    <div class="hoster-panel-header" data-hoster="backup">
      <span class="panel-arrow">&#9654;</span>
      <span class="panel-title">Backup</span>
      <span class="panel-status active">System</span>
    </div>
    <div class="hoster-panel-body" data-panel="backup" style="display:none">
      <p class="hint" style="margin:0 0 10px">Alle Accounts, Einstellungen und den Upload-Verlauf verschlüsselt exportieren oder importieren.</p>
      <div style="display:flex;gap:8px">
        <button class="btn btn-secondary" id="exportBackupBtn">Backup exportieren</button>
        <button class="btn btn-secondary" id="importBackupBtn">Backup importieren</button>
      </div>
    </div>
  `;
  container.appendChild(backupPanel);

  backupPanel.querySelector('.hoster-panel-header').addEventListener('click', () => {
    const body = backupPanel.querySelector('.hoster-panel-body');
    const arrow = backupPanel.querySelector('.panel-arrow');
    const isOpen = body.style.display !== 'none';
    body.style.display = isOpen ? 'none' : 'block';
    arrow.innerHTML = isOpen ? '&#9654;' : '&#9660;';
  });

  document.getElementById('exportBackupBtn').addEventListener('click', () => doBackupExport());
  document.getElementById('importBackupBtn').addEventListener('click', () => doBackupImport());

  // --- Separator before hoster panels ---
  const separator = document.createElement('div');
  separator.style.cssText = 'height:16px';
  container.appendChild(separator);

  if (configuredAccounts.length === 0) {
    const empty = document.createElement('div');
    empty.className = 'settings-empty';
    empty.innerHTML = '<p>Noch keine Account-Einstellungen vorhanden.</p><span class="hint">Sobald du einen Account anlegst, erscheinen hier die passenden Upload-Einstellungen.</span>';
    container.appendChild(empty);
  }

  for (const { name } of configuredAccounts) {
    const hs = hosterSettings[name] || {};
    const maxSpeedMbs = hs.maxSpeedKbs > 0 ? (hs.maxSpeedKbs / 1024).toFixed(2).replace(/\.00$/, '') : '0';

    const panel = document.createElement('div');
    panel.className = 'hoster-settings-panel';

    panel.innerHTML = `
      <div class="hoster-panel-header" data-hoster="${name}">
        <span class="panel-arrow">&#9654;</span>
        <span class="panel-title">${escapeHtml(getHosterLabel(name))}</span>
        <span class="panel-status active">Aktiv</span>
      </div>
      <div class="hoster-panel-body" data-panel="${name}" style="display:none">
        <h4>Upload-Einstellungen</h4>
        <div class="settings-grid-mini">
          <div class="settings-row">
            <label>Retries</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="retries" value="${hs.retries ?? 3}" min="0" max="500">
          </div>
          <div class="settings-row">
            <label>Max Speed (MB/s)</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="maxSpeedMbs" value="${maxSpeedMbs}" min="0" step="0.1">
            <span class="hint">0 = unbegrenzt</span>
          </div>
          <div class="settings-row">
            <label>Parallele Uploads</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="parallelCount" value="${hs.parallelCount ?? 2}" min="1" max="100">
          </div>
          <div class="settings-row">
            <label>Restart unter (kB/s)</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="restartBelowKbs" value="${hs.restartBelowKbs ?? 0}" min="0">
            <span class="hint">0 = aus</span>
          </div>
          <div class="settings-row">
            <label>Intervall (s)</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="timeIntervalSec" value="${hs.timeIntervalSec ?? 0}" min="0">
          </div>
          <div class="settings-row">
            <label>Max Size (MB)</label>
            <input type="number" class="hs-input settings-autosave" data-hoster="${name}" data-hs="maxSizeMb" value="${hs.maxSizeMb ?? 0}" min="0">
            <span class="hint">0 = unbegrenzt</span>
          </div>
          <div class="settings-row">
            <label>Links in Log schreiben</label>
            <input type="checkbox" class="hs-input settings-autosave" data-hoster="${name}" data-hs="logToFile" ${hs.logToFile !== false ? 'checked' : ''}>
            <span class="hint">Erfolgreiche Links in fileuploader.log. Aus = auch kein Doppel-Upload-Schutz beim Neustart für diesen Hoster.</span>
          </div>
        </div>
      </div>
    `;

    container.appendChild(panel);

    // Toggle panel
    panel.querySelector('.hoster-panel-header').addEventListener('click', () => {
      const body = panel.querySelector('.hoster-panel-body');
      const arrow = panel.querySelector('.panel-arrow');
      const isOpen = body.style.display !== 'none';
      body.style.display = isOpen ? 'none' : 'block';
      arrow.innerHTML = isOpen ? '&#9654;' : '&#9660;';
    });
  }

  document.getElementById('chooseLogFilePathBtn')?.addEventListener('click', chooseLogFilePath);
  document.getElementById('openLogFolderBtn')?.addEventListener('click', () => window.api.openLogFolder());
  document.getElementById('manualUpdateCheckBtn')?.addEventListener('click', async (e) => {
    const btn = e.target;
    btn.disabled = true;
    btn.textContent = 'Prüfe...';
    try {
      const result = await window.api.checkForUpdate();
      if (result && result.available) {
        showUpdateBanner(result);
        btn.textContent = 'Update gefunden!';
      } else {
        btn.textContent = 'Kein Update verfügbar';
      }
    } catch {
      btn.textContent = 'Fehler beim Prüfen';
    }
    setTimeout(() => { btn.disabled = false; btn.textContent = 'Nach Updates suchen'; }, 3000);
  });
  container.querySelectorAll('.settings-autosave').forEach((input) => {
    const eventName = input.type === 'checkbox' ? 'change' : 'input';
    input.addEventListener(eventName, scheduleSettingsSave);
  });
}

async function chooseLogFilePath() {
  const folders = await window.api.selectFolder();
  if (!folders || !folders[0]) return;
  const normalized = folders[0].replace(/[\\\/]+$/, '');
  document.getElementById('logFilePathInput').value = `${normalized}\\fileuploader.log`;
  scheduleSettingsSave();
}

function scheduleSettingsSave() {
  const feedback = document.getElementById('saveFeedback');
  if (feedback) feedback.textContent = 'Speichert...';
  clearTimeout(settingsSaveTimer);
  settingsSaveTimer = setTimeout(() => {
    saveSettings({ feedbackText: 'Automatisch gespeichert' }).catch((err) => {
      if (feedback) feedback.textContent = `Speichern fehlgeschlagen: ${err.message}`;
    });
  }, 350);
}

async function saveSettings(options = {}) {
  const { feedbackText = 'Gespeichert!' } = options;
  const newHosterSettings = { ...(config.hosterSettings || {}) };
  const globalSettings = {
    ...(config.globalSettings || {}),
    logFilePath: (document.getElementById('logFilePathInput')?.value || '').trim(),
    logMode: (() => {
      const v = document.getElementById('logModeInput')?.value;
      return (v === 'single' || v === 'daily' || v === 'session') ? v : 'single';
    })(),
    resumeQueueOnLaunch: !!document.getElementById('resumeQueueOnLaunchInput')?.checked,
    parallelUploadCount: Math.max(0, Math.min(100, parseInt(document.getElementById('parallelUploadCountInput')?.value || '0', 10) || 0)),
    scaleParallelUploads: !!document.getElementById('scaleParallelUploadsInput')?.checked,
    removeFromQueueOnDone: !!document.getElementById('removeFromQueueOnDoneInput')?.checked,
    showDropTarget: !!document.getElementById('showDropTargetInput')?.checked,
    globalMaxSpeedKbs: Math.max(0, Math.round((parseFloat(document.getElementById('globalMaxSpeedMbsInput')?.value || '0') || 0) * 1024)),
    folderMonitor: {
      enabled: !!document.getElementById('fmEnabledInput')?.checked,
      folderPath: (document.getElementById('fmFolderPathInput')?.value || '').trim(),
      recursive: !!document.getElementById('fmRecursiveInput')?.checked,
      filterMode: document.getElementById('fmFilterModeInput')?.value || 'include',
      extensions: (document.getElementById('fmExtensionsInput')?.value || '').trim(),
      skipDuplicates: !!document.getElementById('fmSkipDuplicatesInput')?.checked,
      delaySec: Math.max(1, parseInt(document.getElementById('fmDelaySecInput')?.value || '3', 10) || 3),
      autoStart: !!document.getElementById('fmAutoStartInput')?.checked,
      hosters: Array.from(document.querySelectorAll('.fm-hoster-checkbox:checked')).map(el => el.dataset.fmHoster)
    },
    remote: {
      enabled: !!document.getElementById('remoteEnabledInput')?.checked,
      port: Math.max(1024, Math.min(65535, parseInt(document.getElementById('remotePortInput')?.value || '9100', 10) || 9100)),
      token: (document.getElementById('remoteTokenInput')?.value || '').trim(),
      allowInput: !!document.getElementById('remoteAllowInputInput')?.checked
    }
  };

  // Always on top setting
  const aotCheckbox = document.getElementById('alwaysOnTopInput');
  if (aotCheckbox) {
    const newAot = !!aotCheckbox.checked;
    if (newAot !== alwaysOnTopState) {
      alwaysOnTopState = newAot;
      await window.api.setAlwaysOnTop(alwaysOnTopState);
    }
  }

  // Drop target window
  const dtCheckbox = document.getElementById('showDropTargetInput');
  if (dtCheckbox) {
    if (dtCheckbox.checked) await window.api.showDropTarget();
    else await window.api.hideDropTarget();
  }

  for (const name of HOSTERS) {
    const hs = { ...(hosterSettings[name] || {}) };
    document.querySelectorAll(`.hs-input[data-hoster="${name}"]`).forEach(input => {
      const field = input.dataset.hs;
      if (input.type === 'checkbox') hs[field] = input.checked;
      else if (field === 'maxSpeedMbs') hs.maxSpeedKbs = Math.max(0, Math.round((parseFloat(input.value) || 0) * 1024));
      else hs[field] = parseInt(input.value, 10) || 0;
    });
    newHosterSettings[name] = hs;
  }

  // Fire both saves in parallel instead of serializing the two IPC round-trips.
  // Skip the getConfig refetch — we just wrote it, we know the new state, and
  // the round-trip added 100–200ms of UI stall per keystroke (autosave fires
  // on every input change).
  await Promise.all([
    window.api.saveHosterSettings(newHosterSettings),
    window.api.saveGlobalSettings(globalSettings)
  ]);
  config.hosterSettings = newHosterSettings;
  config.globalSettings = globalSettings;
  hosterSettings = newHosterSettings;
  clearTimeout(settingsSaveTimer);

  // Start/stop folder monitor based on settings
  const fmSettings = globalSettings.folderMonitor;
  const badge = document.getElementById('folderMonitorStatusBadge');
  if (fmSettings && fmSettings.enabled && fmSettings.folderPath) {
    try {
      await window.api.folderMonitorStart(fmSettings);
      if (badge) { badge.textContent = 'Aktiv'; badge.className = 'panel-status active'; }
    } catch {
      if (badge) { badge.textContent = 'Fehler'; badge.className = 'panel-status'; }
    }
  } else {
    await window.api.folderMonitorStop();
    if (badge) { badge.textContent = 'Inaktiv'; badge.className = 'panel-status'; }
  }

  // Start/stop remote server based on settings
  const remoteSettings = globalSettings.remote;
  const remoteBadge = document.getElementById('remoteStatusBadge');
  if (remoteSettings) {
    try {
      await window.api.remoteSaveSettings(remoteSettings);
      if (remoteBadge) {
        remoteBadge.textContent = remoteSettings.enabled ? 'Aktiv' : 'Inaktiv';
        remoteBadge.className = `panel-status${remoteSettings.enabled ? ' active' : ''}`;
      }
      // Update status display
      const status = await window.api.remoteStatus();
      const statusEl = document.getElementById('remoteConnectionStatus');
      if (statusEl) {
        if (status.running) {
          statusEl.textContent = `Aktiv auf Port ${status.port} — ${status.clientCount} Client(s) verbunden`;
          statusEl.style.color = '#10b981';
        } else {
          statusEl.textContent = 'Nicht aktiv';
          statusEl.style.color = '#94a3b8';
        }
      }
    } catch {}
  }

  const feedback = document.getElementById('saveFeedback');
  feedback.textContent = feedbackText;
  setTimeout(() => {
    if (feedback.textContent === feedbackText) {
      feedback.textContent = 'Änderungen werden automatisch gespeichert.';
    }
  }, 1800);
}

// --- Accounts ---
function getCredentialLabel(name, account) {
  if (!account) return 'Keine Zugangsdaten';
  if (account.authType === 'api') return `API: ${maskCredential(account.apiKey) || 'nicht gesetzt'}`;
  if (account.authType === 'login') return `Login: ${account.username || 'nicht gesetzt'}`;
  // Fallback
  if (account.username && account.password) return `Login: ${account.username}`;
  if (account.apiKey) return `API: ${maskCredential(account.apiKey)}`;
  return 'Keine Zugangsdaten';
}

const _STATUS_LABELS = { ok: 'Bereit', warn: 'Warnung', checking: 'Prüfe...', error: 'Fehler', unchecked: 'Nicht geprüft' };

function _buildAccountCardHtml(name, account, idx) {
  const isDisabled = account.enabled === false;
  const st = accountStatuses[account.id] || { status: 'unchecked', message: '' };
  const statusLabel = isDisabled ? 'Deaktiviert' : (_STATUS_LABELS[st.status] || 'Nicht geprüft');
  const statusClass = isDisabled ? 'disabled' : st.status;
  const credLabel = getCredentialLabel(name, account);
  const userLabel = account.label && String(account.label).trim();
  // Subtitle: "Label: XYZ • API: ABC… • <status>" — the user-set label is the
  // disambiguator for accounts that otherwise look identical (e.g. two byse
  // API-key accounts where you can't tell what's what from the masked key).
  const subtitleText = (userLabel ? `Label: ${userLabel} • ` : '') + credLabel;
  const toggleLabel = isDisabled ? 'Aktivieren' : 'Deaktivieren';
  const priorityLabel = idx === 0 ? 'Primär' : `Fallback #${idx}`;

  const isSessionPaused = _sessionFailedKeys.has(`${name}:${account.id}`);
  const sessionPausedBadge = isSessionPaused
    ? `<span class="account-session-paused" title="Account wurde diese Session als fehlerhaft markiert. Klick = Wieder als aktiv markieren.">Pausiert (Session) <button class="account-session-reactivate" data-account-reactivate="${account.id}" data-account-reactivate-hoster="${name}" title="Wieder aktivieren">↻</button></span>`
    : '';

  return `
    <div class="account-card${isDisabled ? ' account-disabled' : ''}${isSessionPaused ? ' account-session-paused-card' : ''}" data-account-id="${account.id}" data-account-hoster="${name}" draggable="true">
      <div class="account-card-drag-handle" title="Ziehen zum Sortieren">&#9776;</div>
      <div class="account-card-info">
        <div class="account-card-title">${escapeHtml(getAccountDisplayName(name, account))} <span class="account-priority-badge">${priorityLabel}</span> ${sessionPausedBadge}</div>
        <div class="account-card-subtitle" title="${escapeAttr(subtitleText)}">${escapeHtml(subtitleText)}${st.message && !isDisabled ? ` • ${escapeHtml(st.message)}` : ''}</div>
      </div>
      <span class="account-status status-${statusClass}">
        <span class="account-status-dot"></span>
        ${statusLabel}
      </span>
      <div class="account-card-actions">
        <button class="btn btn-xs btn-secondary" data-account-toggle="${account.id}">${toggleLabel}</button>
        <button class="btn btn-xs btn-secondary" data-account-check="${account.id}" ${isDisabled ? 'disabled' : ''}>Prüfen</button>
        <button class="btn btn-xs btn-secondary" data-account-edit="${account.id}">Bearbeiten</button>
        <button class="btn btn-xs btn-danger" data-account-delete="${account.id}">Löschen</button>
      </div>
    </div>`;
}

// Replace only the one card for `accountId` instead of re-rendering the whole
// container. Runs on enable/disable, single health check, priority-badge bumps
// after a reorder — anywhere we only change one card's state.
function updateAccountCard(accountId) {
  const container = document.getElementById('accountsList');
  if (!container) return;
  const found = findAccountById(accountId);
  if (!found) return;
  const card = container.querySelector(`.account-card[data-account-id="${accountId}"]`);
  if (!card) return;
  const accounts = config.hosters[found.name] || [];
  const idx = accounts.findIndex(a => a.id === accountId);
  if (idx < 0) return;
  const tmp = document.createElement('div');
  tmp.innerHTML = _buildAccountCardHtml(found.name, found.account, idx);
  card.replaceWith(tmp.firstElementChild);
  _refreshHosterGroupHeader(found.name);
}

function _refreshHosterGroupHeader(name) {
  const container = document.getElementById('accountsList');
  if (!container) return;
  const group = container.querySelector(`.account-hoster-group[data-hoster-group="${name}"]`);
  if (!group) return;
  const accounts = config.hosters[name] || [];
  const summary = _summarizeHosterGroup(accounts);
  let dot = 'unchecked';
  if (summary.error > 0) dot = 'error';
  else if (summary.checking > 0) dot = 'checking';
  else if (summary.ok > 0 && summary.unchecked === 0) dot = 'ok';
  const dotEl = group.querySelector('.account-hoster-group-header .account-status-dot');
  if (dotEl) dotEl.className = `account-status-dot status-${dot}`;
  const countEl = group.querySelector('.account-hoster-group-count');
  if (countEl) countEl.textContent = `${summary.ok}/${summary.total}`;
  group.querySelectorAll('.account-hoster-group-meta').forEach(el => el.remove());
  const header = group.querySelector('.account-hoster-group-header');
  if (header) {
    if (summary.disabled) {
      const meta = document.createElement('span');
      meta.className = 'account-hoster-group-meta';
      meta.textContent = `${summary.disabled} deaktiviert`;
      header.appendChild(meta);
    }
    if (summary.error) {
      const meta = document.createElement('span');
      meta.className = 'account-hoster-group-meta error';
      meta.textContent = `${summary.error} Fehler`;
      header.appendChild(meta);
    }
  }
}

let _accountListenersBound = false;

function renderAccounts() {
  const container = document.getElementById('accountsList');
  if (!container) return;
  ensureAccountStatusEntries();

  const allAccounts = getAllAccountsFlat();
  const runCheckBtn = document.getElementById('accountsRunHealthCheckBtn');
  if (runCheckBtn) runCheckBtn.disabled = healthCheckRunning;

  if (allAccounts.length === 0) {
    container.innerHTML = `
      <div class="accounts-empty">
        <p>Keine Accounts vorhanden</p>
        <span class="hint">Klicke auf "Account hinzufügen", um einen Hoster einzurichten.</span>
      </div>`;
    if (!_accountListenersBound) bindAccountListeners(container);
    return;
  }

  const byHoster = {};
  for (const { name, account } of allAccounts) {
    if (!byHoster[name]) byHoster[name] = [];
    byHoster[name].push(account);
  }

  let html = '';
  for (const name of HOSTERS) {
    const accounts = byHoster[name];
    if (!accounts || accounts.length === 0) continue;
    html += _buildAccountHosterGroupHtml(name, accounts);
  }
  container.innerHTML = html;

  if (!_accountListenersBound) bindAccountListeners(container);
}

function _summarizeHosterGroup(accounts) {
  let ok = 0, error = 0, checking = 0, unchecked = 0, disabled = 0;
  for (const a of accounts) {
    if (a.enabled === false) { disabled++; continue; }
    const s = (accountStatuses[a.id] && accountStatuses[a.id].status) || 'unchecked';
    if (s === 'ok' || s === 'warn') ok++;
    else if (s === 'error') error++;
    else if (s === 'checking') checking++;
    else unchecked++;
  }
  return { ok, error, checking, unchecked, disabled, total: accounts.length };
}

function _hosterGroupOpenState(name, summary) {
  const prev = _hosterGroupOpenMemory.get(name);
  if (prev && typeof prev === 'object') {
    if (summary.error > (prev.errorsAtClose || 0)) {
      _hosterGroupOpenMemory.delete(name);
      return true;
    }
    return prev.state === 'open';
  }
  return summary.error > 0;
}

const _hosterGroupOpenMemory = new Map();

function _buildAccountHosterGroupHtml(name, accounts) {
  const summary = _summarizeHosterGroup(accounts);
  const isOpen = _hosterGroupOpenState(name, summary);
  let dot = 'unchecked';
  if (summary.error > 0) dot = 'error';
  else if (summary.checking > 0) dot = 'checking';
  else if (summary.ok > 0 && summary.unchecked === 0) dot = 'ok';
  const countLabel = `${summary.ok}/${summary.total}`;
  const arrow = isOpen ? '&#9660;' : '&#9654;';
  let cardsHtml = '';
  accounts.forEach((account, idx) => { cardsHtml += _buildAccountCardHtml(name, account, idx); });
  const bodyStyle = isOpen ? '' : 'style="display:none"';
  const lifeStat = _hosterLifetimeStat(name);
  const lifeMeta = lifeStat && lifeStat.total > 0
    ? `<span class="account-hoster-group-meta" title="Erfolgsrate aus den letzten ${lifeStat.total} Uploads dieses Hosters">${Math.round(lifeStat.rate * 100)}% ok (${lifeStat.total})</span>`
    : '';
  return `<div class="account-hoster-group" data-hoster-group="${name}">
    <div class="account-hoster-group-header" data-hoster-toggle="${name}">
      <span class="panel-arrow">${arrow}</span>
      <span class="account-status-dot status-${dot}"></span>
      <span class="account-hoster-group-title">${escapeHtml(getHosterLabel(name))}</span>
      <span class="account-hoster-group-count">${countLabel}</span>
      ${summary.disabled ? `<span class="account-hoster-group-meta">${summary.disabled} deaktiviert</span>` : ''}
      ${summary.error ? `<span class="account-hoster-group-meta error">${summary.error} Fehler</span>` : ''}
      ${lifeMeta}
    </div>
    <div class="account-hoster-group-body" ${bodyStyle}>${cardsHtml}</div>
  </div>`;
}

let _hosterLifetimeCache = null;
function _hosterLifetimeStat(name) {
  if (!_hosterLifetimeCache && window.Stats && Array.isArray(window._historyForStats)) {
    _hosterLifetimeCache = window.Stats.summarizePerHoster(window._historyForStats, { lastNBatches: 50 });
  }
  return _hosterLifetimeCache ? _hosterLifetimeCache[name] : null;
}
function _invalidateHosterLifetimeCache() { _hosterLifetimeCache = null; }

// Single set of delegated listeners on the accounts container. Bound once on
// the first render and reused for every subsequent in-place update / card
// swap. Previously we rebound 4 × N button listeners + 5 × N drag listeners
// per render — with 20 accounts that's 180 listener create/destroy cycles on
// every enable/disable click.
function bindAccountListeners(container) {
  _accountListenersBound = true;
  container.addEventListener('click', (e) => {
    const header = e.target.closest('[data-hoster-toggle]');
    if (header && !e.target.closest('button')) {
      const name = header.dataset.hosterToggle;
      const group = header.closest('.account-hoster-group');
      const body = group && group.querySelector('.account-hoster-group-body');
      const arrow = header.querySelector('.panel-arrow');
      if (body) {
        const willOpen = body.style.display === 'none';
        body.style.display = willOpen ? '' : 'none';
        if (arrow) arrow.innerHTML = willOpen ? '&#9660;' : '&#9654;';
        const summary = _summarizeHosterGroup(config.hosters[name] || []);
        _hosterGroupOpenMemory.set(name, { state: willOpen ? 'open' : 'closed', errorsAtClose: summary.error });
      }
      return;
    }
    const btn = e.target.closest('button');
    if (!btn) return;
    if (btn.dataset.accountToggle) return toggleAccount(btn.dataset.accountToggle);
    if (btn.dataset.accountEdit) return openAccountModal(btn.dataset.accountEdit);
    if (btn.dataset.accountDelete) return openDeleteAccountModal(btn.dataset.accountDelete);
    if (btn.dataset.accountCheck) return checkSingleAccount(btn.dataset.accountCheck);
    if (btn.dataset.accountReactivate) {
      const accountId = btn.dataset.accountReactivate;
      const hoster = btn.dataset.accountReactivateHoster;
      if (!hoster || !accountId) return;
      e.stopPropagation();
      window.api.resetSessionFailedAccount({ hoster, accountId }).then(() => {
        _sessionFailedKeys.delete(`${hoster}:${accountId}`);
        renderAccounts();
        showCopyToast(`${getHosterLabel(hoster)} Account wieder aktiv — nächste Batch verwendet ihn`);
      }).catch(() => {});
      return;
    }
  });

  let draggedCard = null;
  container.addEventListener('dragstart', (e) => {
    const card = e.target.closest('.account-card[draggable]');
    if (!card) return;
    draggedCard = card;
    card.classList.add('dragging');
    if (e.dataTransfer) e.dataTransfer.effectAllowed = 'move';
  });
  container.addEventListener('dragend', () => {
    if (draggedCard) draggedCard.classList.remove('dragging');
    draggedCard = null;
    container.querySelectorAll('.drag-over-above, .drag-over-below').forEach(c => c.classList.remove('drag-over-above', 'drag-over-below'));
  });
  container.addEventListener('dragover', (e) => {
    const card = e.target.closest('.account-card[draggable]');
    if (!card || !draggedCard || draggedCard === card) return;
    if (draggedCard.dataset.accountHoster !== card.dataset.accountHoster) return;
    e.preventDefault();
    if (e.dataTransfer) e.dataTransfer.dropEffect = 'move';
    const rect = card.getBoundingClientRect();
    const midY = rect.top + rect.height / 2;
    card.classList.toggle('drag-over-above', e.clientY < midY);
    card.classList.toggle('drag-over-below', e.clientY >= midY);
  });
  container.addEventListener('dragleave', (e) => {
    const card = e.target.closest('.account-card[draggable]');
    if (card) card.classList.remove('drag-over-above', 'drag-over-below');
  });
  container.addEventListener('drop', (e) => {
    const card = e.target.closest('.account-card[draggable]');
    if (!card || !draggedCard || draggedCard === card) return;
    e.preventDefault();
    card.classList.remove('drag-over-above', 'drag-over-below');
    const hosterName = card.dataset.accountHoster;
    if (draggedCard.dataset.accountHoster !== hosterName) return;

    const draggedId = draggedCard.dataset.accountId;
    const targetId = card.dataset.accountId;
    const accounts = config.hosters[hosterName];
    if (!Array.isArray(accounts)) return;

    const fromIdx = accounts.findIndex(a => a.id === draggedId);
    if (fromIdx < 0) return;
    const [moved] = accounts.splice(fromIdx, 1);
    const rect = card.getBoundingClientRect();
    const insertBefore = e.clientY < rect.top + rect.height / 2;
    const newToIdx = accounts.findIndex(a => a.id === targetId);
    accounts.splice(insertBefore ? newToIdx : newToIdx + 1, 0, moved);

    // Move the DOM node in place — no full re-render.
    if (insertBefore) card.before(draggedCard); else card.after(draggedCard);

    // The Primär / Fallback #N badges just changed for the whole group.
    for (let i = 0; i < accounts.length; i++) updateAccountCard(accounts[i].id);

    // Persist in the background. saveConfig is idempotent; we don't need to
    // await here or re-fetch — our in-memory config is already the truth.
    window.api.saveConfig({ hosters: config.hosters }).catch(() => {});
  });
}

async function toggleAccount(accountId) {
  const found = findAccountById(accountId);
  if (!found) return;
  found.account.enabled = !found.account.enabled;
  syncSelectedUploadHosters();
  // In-place: swap only the one affected card. No full re-render, no IPC
  // refetch, no flicker. Rapid click-toggles now feel instant even with 50
  // accounts in the list.
  updateAccountCard(accountId);
  renderHosterSummary();
  window.api.saveConfig({ hosters: config.hosters }).catch(() => {});
}

async function checkSingleAccount(accountId) {
  if (!accountId || healthCheckRunning) return;
  const found = findAccountById(accountId);
  if (!found) return;
  healthCheckRunning = true;
  accountStatuses[accountId] = { status: 'checking', message: '' };
  updateAccountCard(accountId);
  try {
    const result = await window.api.runHealthCheck({ hosters: [{ hoster: found.name, accountId }] });
    const rows = result && Array.isArray(result.results) ? result.results : [];
    const row = rows.find(r => r.accountId === accountId);
    if (row) accountStatuses[accountId] = { status: row.status || 'error', message: row.message || '' };
  } catch (err) {
    accountStatuses[accountId] = { status: 'error', message: err.message || 'Prüfung fehlgeschlagen' };
  } finally {
    healthCheckRunning = false;
  }
  updateAccountCard(accountId);
}

// Per-hoster overrides for the login form. VOE only accepts emails — the
// generic "Username / E-Mail" label sent users down a confusing rabbit hole
// (login fails → upload fetches login redirect → "CSRF token nicht gefunden").
// Other hosters that genuinely accept either keep the generic wording.
const LOGIN_FIELD_LABELS = {
  'voe.sx': { label: 'E-Mail', placeholder: 'E-Mail-Adresse', inputType: 'email' }
};

function getCredsFieldsHtml(authType, account, hoster) {
  account = account || {};
  if (authType === 'login') {
    const fld = (hoster && LOGIN_FIELD_LABELS[hoster]) || {
      label: 'Username / E-Mail', placeholder: 'Username oder E-Mail', inputType: 'text'
    };
    return `
      <div class="settings-row">
        <label>${escapeHtml(fld.label)}</label>
        <input type="${fld.inputType}" class="key-input" id="accField_username" value="${escapeAttr(account.username || '')}" placeholder="${escapeAttr(fld.placeholder)}">
      </div>
      <div class="settings-row">
        <label>Passwort</label>
        <input type="password" class="key-input" id="accField_password" value="${escapeAttr(account.password || '')}" placeholder="Passwort">
        <button class="toggle-vis" type="button" title="Anzeigen">&#128065;</button>
      </div>`;
  }
  // API key
  return `
    <div class="settings-row">
      <label>API Key</label>
      <input type="password" class="key-input" id="accField_apiKey" value="${escapeAttr(account.apiKey || '')}" placeholder="API Key">
      <button class="toggle-vis" type="button" title="Anzeigen">&#128065;</button>
    </div>`;
}

function openAccountModal(editAccountId) {
  editingAccountId = editAccountId || null;
  // Reset the two-step state — any previously validated snapshot from a prior
  // modal session is stale and must not allow a no-recheck commit.
  _resetAccountModalState();
  const modal = document.getElementById('accountModal');
  const title = document.getElementById('accountModalTitle');
  const subtitle = document.getElementById('accountModalSubtitle');
  const hosterRow = document.getElementById('accountHosterRow');
  const hosterSelect = document.getElementById('accountHosterSelect');
  const credsContainer = document.getElementById('accountCredsFields');
  const statusEl = document.getElementById('accountModalStatus');
  const saveBtn = document.getElementById('saveAccountBtn');
  const labelInput = document.getElementById('accField_label');

  statusEl.textContent = '';
  statusEl.className = 'account-modal-status';

  if (editingAccountId) {
    // Edit mode
    const found = findAccountById(editingAccountId);
    if (!found) return;
    title.textContent = 'Account bearbeiten';
    subtitle.textContent = `Zugangsdaten für ${getAccountDisplayName(found.name, found.account)} bearbeiten.`;
    hosterRow.style.display = 'none';
    saveBtn.textContent = 'Prüfen';
    if (labelInput) labelInput.value = found.account.label || '';
    credsContainer.innerHTML = getCredsFieldsHtml(found.account.authType || 'login', found.account, found.name);
  } else {
    // Add mode — always show all options (multiple accounts per hoster allowed)
    title.textContent = 'Account hinzufügen';
    subtitle.textContent = 'Wähle einen Hoster und gib deine Zugangsdaten ein. Erst „Prüfen" klicken; nach grünem Login wird daraus „Anlegen".';
    hosterRow.style.display = 'flex';
    saveBtn.textContent = 'Prüfen';
    hosterSelect.innerHTML = HOSTER_ADD_OPTIONS.map(opt =>
      `<option value="${opt.value}">${escapeHtml(opt.label)}</option>`
    ).join('');
    const firstOpt = HOSTER_ADD_OPTIONS[0];
    if (labelInput) labelInput.value = '';
    credsContainer.innerHTML = getCredsFieldsHtml(firstOpt.authType, {}, firstOpt.value);
  }

  // Toggle visibility buttons
  credsContainer.querySelectorAll('.toggle-vis').forEach(btn => {
    btn.addEventListener('click', () => {
      const input = btn.previousElementSibling;
      input.type = input.type === 'password' ? 'text' : 'password';
    });
  });

  // Wire field invalidation: any change to a cred field after a green check
  // drops the validated snapshot so the next click is a re-check, not a commit
  // of unverified creds. Re-wired here every open because credsContainer's HTML
  // was replaced.
  _wireCredFieldInvalidation();

  modal.style.display = 'flex';
}

function closeAccountModal() {
  document.getElementById('accountModal').style.display = 'none';
  _hideOtpField();
  editingAccountId = null;
  // Cancel any pending auto-close so a stale timer can't close a future modal
  // the user reopens within the auto-close window.
  if (_autoCloseTimer) { clearTimeout(_autoCloseTimer); _autoCloseTimer = null; }
  _validatedCreds = null;
  _accountModalBusy = false;
}

function openDeleteAccountModal(accountId) {
  const found = findAccountById(accountId);
  if (!found) return;
  const modal = document.getElementById('deleteAccountModal');
  const msg = document.getElementById('deleteAccountMessage');
  msg.textContent = `Account "${getAccountDisplayName(found.name, found.account)}" wirklich löschen?`;
  modal.dataset.accountId = accountId;
  modal.style.display = 'flex';
}

function closeDeleteModal() {
  document.getElementById('deleteAccountModal').style.display = 'none';
}

async function deleteAccount(accountId) {
  const found = findAccountById(accountId);
  if (!found) return;
  // Remove account from the array
  const accounts = config.hosters[found.name];
  if (Array.isArray(accounts)) {
    config.hosters[found.name] = accounts.filter(a => a.id !== accountId);
  }
  delete accountStatuses[accountId];
  // saveConfig is async — close the modal immediately so the UI feels
  // responsive instead of waiting for the atomic write + safeStorage encrypt.
  // The in-memory config already reflects the delete; the IPC just persists it.
  closeDeleteModal();
  ensureAccountStatusEntries();
  syncSelectedUploadHosters();
  if (getAllAccountsFlat().length === 0) renderHealthCheckResults([]);
  renderAccounts();
  renderHosterSummary();
  // Fire-and-forget the persist. The earlier `await getConfig()` round-trip
  // was redundant (we already have the truth in memory) and was the main
  // source of perceived lag on add/delete.
  window.api.saveConfig({ hosters: config.hosters }).catch(() => {});
}

function readAccountCredsFromModal(authType) {
  const label = (document.getElementById('accField_label')?.value || '').trim();
  if (authType === 'login') {
    const username = (document.getElementById('accField_username')?.value || '').trim();
    const password = (document.getElementById('accField_password')?.value || '').trim();
    return { enabled: !!(username && password), authType: 'login', username, password, label };
  }
  // API
  const apiKey = (document.getElementById('accField_apiKey')?.value || '').trim();
  return { enabled: !!apiKey, authType: 'api', apiKey, label };
}

// --- Two-step account-modal state machine ---
//
// Goal: never persist invalid/unverified credentials to config.hosters. The
// user clicks "Prüfen" → ephemeral validate-credentials IPC runs → on green
// the button label flips to "Anlegen" / "Speichern" → the next click commits
// to config. Editing any cred field between the two clicks drops the validated
// snapshot so the user can't sneak unverified creds through by editing
// post-green.
//
// Invariants enforced here:
//  1. Nothing reaches config.hosters until _validatedCreds matches a green
//     result for the currently-typed creds.
//  2. _accountModalBusy is set SYNCHRONOUSLY at the top of the click handler
//     before any await — guards against double-clicks producing duplicates.
//  3. OTP retry stays ephemeral: each retry re-runs validate-credentials with
//     the new OTP, no config writes until green.
//  4. Edit mode hits the same path → bad edits never overwrite known-good
//     creds on disk.
let _accountModalBusy = false;
let _validatedCreds = null; // { hosterName, authType, snapshot, status } when green
let _autoCloseTimer = null;
// Session token used to ignore stale validate-credentials responses: if the
// user closes the modal mid-flight and reopens it, the late .then must NOT
// stomp the new session's state. Bumped on every modal reset.
let _accountModalSession = 0;

function _resetAccountModalState() {
  _accountModalBusy = false;
  _validatedCreds = null;
  _accountModalSession++;
  if (_autoCloseTimer) { clearTimeout(_autoCloseTimer); _autoCloseTimer = null; }
}

function _credsSnapshotKey(authType, creds) {
  // Identity key for the typed creds — used to detect post-validation edits.
  // Label changes do NOT invalidate (label is metadata, not a credential).
  if (authType === 'login') return `login:${creds.username || ''}:${creds.password || ''}`;
  return `api:${creds.apiKey || ''}`;
}

function _wireCredFieldInvalidation() {
  // Any change to a cred IDENTITY field (username/password/apiKey) clears the
  // validated snapshot and reverts the button to "Prüfen". Label edits don't
  // invalidate (label is metadata, not a credential). OTP edits don't either:
  // OTP is an ephemeral auth challenge — once doodstream returned "ok" for
  // these username+password+OTP, the resulting trust is on the creds; the user
  // clearing or fixing the OTP field afterward shouldn't force a re-prompt.
  const ids = ['accField_username', 'accField_password', 'accField_apiKey'];
  for (const id of ids) {
    const el = document.getElementById(id);
    if (!el || el.dataset.invalidateBound === '1') continue;
    el.addEventListener('input', () => {
      if (_validatedCreds) {
        _validatedCreds = null;
        const saveBtn = document.getElementById('saveAccountBtn');
        if (saveBtn) saveBtn.textContent = 'Prüfen';
        const statusEl = document.getElementById('accountModalStatus');
        if (statusEl) { statusEl.textContent = ''; statusEl.className = 'account-modal-status'; }
      }
    });
    el.dataset.invalidateBound = '1';
  }
}

function _determineHosterContext() {
  if (editingAccountId) {
    const found = findAccountById(editingAccountId);
    if (!found) return null;
    return { hosterName: found.name, authType: found.account.authType || 'login', accountId: editingAccountId, isEdit: true };
  }
  const selectValue = document.getElementById('accountHosterSelect')?.value;
  if (!selectValue) return null;
  const opt = HOSTER_ADD_OPTIONS.find(o => o.value === selectValue);
  if (!opt) return null;
  return { hosterName: opt.hoster, authType: opt.authType, accountId: null, isEdit: false };
}

async function saveAccount() {
  // SYNCHRONOUS re-entry guard — must come before any await. Without this a
  // double-click before the first IPC returns triggers two saveAccount() calls
  // and (in the old code) two pushes/two IPCs. _accountModalBusy is checked
  // synchronously and set synchronously, so the second click no-ops cleanly.
  if (_accountModalBusy) return;

  const ctx = _determineHosterContext();
  if (!ctx) return;
  const creds = readAccountCredsFromModal(ctx.authType);
  const statusEl = document.getElementById('accountModalStatus');
  const saveBtn = document.getElementById('saveAccountBtn');
  if (!creds.enabled) {
    statusEl.textContent = 'Bitte Zugangsdaten eingeben.';
    statusEl.className = 'account-modal-status error';
    return;
  }

  // STEP 2: commit. Only fires if a previous "Prüfen" already validated the
  // EXACT same creds (label changes don't break this — label isn't part of the
  // credential identity).
  const snapshotKey = _credsSnapshotKey(ctx.authType, creds);
  if (_validatedCreds &&
      _validatedCreds.hosterName === ctx.hosterName &&
      _validatedCreds.authType === ctx.authType &&
      _validatedCreds.snapshot === snapshotKey) {
    // Set busy INSIDE the try so a sync throw on the saveBtn deref above can't
    // leak _accountModalBusy=true and lock the user out for the session.
    try {
      _accountModalBusy = true;
      saveBtn.disabled = true;
      saveBtn.textContent = ctx.isEdit ? 'Speichere…' : 'Lege an…';
      await _commitAccount(ctx, creds, _validatedCreds.status, _validatedCreds.message);
    } finally {
      _accountModalBusy = false;
      if (saveBtn) saveBtn.disabled = false;
    }
    return;
  }

  // STEP 1: validate ephemerally. NOTHING is written to config.hosters here.
  // Snapshot the session token so a stale late-arriving response from a
  // closed-and-reopened modal can't stomp the new session's state.
  const mySession = _accountModalSession;
  _accountModalBusy = true;
  saveBtn.disabled = true;
  statusEl.textContent = 'Prüfe Login…';
  statusEl.className = 'account-modal-status checking';

  const otpInput = document.getElementById('accField_otp');
  const otp = otpInput ? otpInput.value.trim() : '';
  const payload = {
    hoster: ctx.hosterName,
    authType: ctx.authType,
    username: creds.username || '',
    password: creds.password || '',
    apiKey: creds.apiKey || '',
    otp
  };

  let row;
  try {
    row = await window.api.validateCredentials(payload);
  } catch (err) {
    row = { status: 'error', message: err && err.message ? err.message : 'Prüfung fehlgeschlagen' };
  } finally {
    if (mySession === _accountModalSession) {
      _accountModalBusy = false;
      if (saveBtn) saveBtn.disabled = false;
    }
  }

  // Stale response — modal was closed/reopened while we awaited. Drop it.
  if (mySession !== _accountModalSession) return;

  if (row && row.status === 'otp_required') {
    statusEl.textContent = row.message || 'OTP wurde an deine E-Mail gesendet.';
    statusEl.className = 'account-modal-status error';
    _showOtpField();
    _wireCredFieldInvalidation(); // OTP input now exists — wire its listener too
    saveBtn.textContent = 'Mit OTP prüfen';
    return;
  }
  if (row && (row.status === 'ok' || row.status === 'warn')) {
    statusEl.textContent = row.status === 'warn' ? row.message || 'Prüfung mit Warnung abgeschlossen.' : 'Login erfolgreich! Klick „' + (ctx.isEdit ? 'Speichern' : 'Anlegen') + '" zum Übernehmen.';
    statusEl.className = 'account-modal-status ok';
    _hideOtpField();
    _validatedCreds = {
      hosterName: ctx.hosterName,
      authType: ctx.authType,
      snapshot: snapshotKey,
      status: row.status,
      message: row.message || ''
    };
    saveBtn.textContent = ctx.isEdit ? 'Speichern' : 'Anlegen';
    return;
  }
  // error
  const msg = (row && row.message) || 'Login fehlgeschlagen';
  statusEl.textContent = msg;
  statusEl.className = 'account-modal-status error';
}

async function _commitAccount(ctx, creds, validatedStatus, validatedMessage) {
  // Persist the validated creds to config.hosters and close the modal. By the
  // time we reach this function the validate-credentials IPC has already
  // returned ok/warn for these exact creds, so we skip a redundant re-check.
  let accountId;
  if (!Array.isArray(config.hosters[ctx.hosterName])) config.hosters[ctx.hosterName] = [];
  if (ctx.isEdit) {
    accountId = ctx.accountId;
    const idx = config.hosters[ctx.hosterName].findIndex(a => a.id === accountId);
    if (idx >= 0) {
      config.hosters[ctx.hosterName][idx] = { ...config.hosters[ctx.hosterName][idx], ...creds };
    }
  } else {
    accountId = `${ctx.hosterName}-${Date.now()}-${Math.random().toString(36).slice(2, 6)}`;
    config.hosters[ctx.hosterName].push({ id: accountId, ...creds });
  }
  await window.api.saveConfig({ hosters: config.hosters });
  // Skip the redundant await getConfig() — the in-memory state is the source
  // of truth for what we just wrote, decrypted creds didn't change, and the
  // round-trip was the main lag source on add/delete.
  accountStatuses[accountId] = { status: validatedStatus, message: validatedMessage || '' };
  ensureAccountStatusEntries();
  syncSelectedUploadHosters();
  // Targeted updates instead of the 4-panel cascade. For add we need a full
  // accounts-list re-render (new card) and the hoster summary count; for edit
  // we can update the single card. Settings panel only needs re-render if its
  // hoster-summary section is visible — that's covered by renderHosterSummary.
  if (ctx.isEdit) {
    updateAccountCard(accountId);
  } else {
    renderAccounts();
  }
  renderHosterSummary();
  // Auto-close after a short pause so the user sees the success state.
  if (_autoCloseTimer) clearTimeout(_autoCloseTimer);
  _autoCloseTimer = setTimeout(() => { closeAccountModal(); _autoCloseTimer = null; }, 600);
}

function _showOtpField() {
  if (document.getElementById('accField_otp')) return; // already visible
  const container = document.getElementById('accountCredsFields');
  const otpHtml = `
    <div class="settings-row" id="otpFieldRow">
      <label>OTP Code</label>
      <input type="text" class="key-input" id="accField_otp" placeholder="6-stelliger Code aus E-Mail" autocomplete="one-time-code" inputmode="numeric" maxlength="10">
    </div>`;
  container.insertAdjacentHTML('beforeend', otpHtml);
  // Auto-focus the OTP field
  setTimeout(() => document.getElementById('accField_otp')?.focus(), 50);
}

function _hideOtpField() {
  const row = document.getElementById('otpFieldRow');
  if (row) row.remove();
}

// --- History ---
async function loadHistory() {
  const history = await window.api.getHistory();
  window._historyForStats = history || [];
  _invalidateHosterLifetimeCache();
  const container = document.getElementById('historyContainer');

  if (!history || history.length === 0) {
    historyRowsData = [];
    container.innerHTML = '<p class="empty-state">Noch keine Uploads.</p>';
    return;
  }

  historySortState = { key: 'date', direction: 'desc' };
  historyRowsData = [];
  let order = 0;

  for (const batch of history) {
    const dt = formatDateTime(batch.timestamp || new Date());
    for (const file of (batch.files || [])) {
      for (const result of (file.results || [])) {
        if (result.status === 'aborted' || result.status === 'error') continue;
        historyRowsData.push({
          date: dt.text, dateTs: dt.ts,
          filename: file.name || '', host: result.hoster || '',
          link: result.download_url || result.embed_url || '',
          isError: false, order: order++
        });
      }
    }
  }

  renderHistoryTable(container);
}

async function exportHistory() {
  const history = await window.api.getHistory();
  if (!history || history.length === 0) {
    alert('Kein Verlauf zum Exportieren vorhanden.');
    return;
  }

  const asCsv = confirm('Verlauf als CSV exportieren?\n\nOK = CSV\nAbbrechen = JSON');
  const format = asCsv ? 'csv' : 'json';
  const result = await window.api.exportHistory(format);

  if (!result || result.canceled) return;
  if (!result.ok) {
    alert(result.error || 'Export fehlgeschlagen.');
    return;
  }

  showCopyToast(`Verlauf exportiert (${result.totalRows || 0} Zeilen)`);
}

// Memoize sort result: invalidated only when data length changes or sort state changes.
// Selection changes and re-renders reuse the cached sorted array — a big win when
// the panel has thousands of rows and the sort is stable.
let _recentSortCache = { sig: '', result: [] };

function sortRecentFiles(data) {
  const { key, direction } = recentSortState;
  const sig = `${key}|${direction}|${data.length}`;
  if (_recentSortCache.sig === sig) return _recentSortCache.result;

  const sorted = data.slice();
  const dir = direction === 'asc' ? 1 : -1;
  sorted.sort((a, b) => {
    if (key === 'date') return dir * ((a.dateTs - b.dateTs) || (a.order - b.order));
    if (key === 'filename') return dir * _collatorDE.compare(a.filename, b.filename);
    if (key === 'host') return dir * _collatorDE.compare(a.host, b.host);
    if (key === 'link') return dir * _collatorDE.compare(a.link, b.link);
    return 0;
  });
  _recentSortCache = { sig, result: sorted };
  return sorted;
}

function updateRecentSortHeaders() {
  const head = document.getElementById('recentFilesHead');
  if (!head) return;
  head.querySelectorAll('th[data-recent-sort]').forEach(th => {
    const key = th.dataset.recentSort;
    const active = recentSortState.key === key;
    const arrow = active ? (recentSortState.direction === 'asc' ? '▲' : '▼') : '↕';
    th.classList.toggle('active', active);
    const indicator = th.querySelector('.sort-indicator');
    if (indicator) indicator.textContent = arrow;
  });
}

let _recentListenersBound = false;

function _buildRecentRowHtml(row) {
  const cls = `recent-file-row${row.isError ? ' error' : ''}${selectedRecentIds.has(row.order) ? ' selected' : ''}`;
  return `<tr class="${cls}" data-order="${row.order}" data-link="${escapeAttr(row.link)}">`
    + `<td>${escapeHtml(row.date)}</td>`
    + `<td title="${escapeAttr(row.filename)}">${escapeHtml(row.filename)}</td>`
    + `<td>${escapeHtml(row.host)}</td>`
    + `<td title="${escapeAttr(row.link)}">${escapeHtml(row.link)}</td>`
    + `</tr>`;
}

// Tracks the last rendered dataset so we can append-only when the user is just
// accumulating new uploads (the default case: sort=date desc, rows only grow).
let _recentLastRenderedSig = '';
let _recentLastRenderedLen = 0;

function renderRecentUploadsPanel() {
  const tbody = document.getElementById('recentFilesBody');
  if (!tbody) return;
  if (!sessionFilesData.length) {
    tbody.innerHTML = '<tr><td colspan="4" class="empty-state">Noch keine Uploads in dieser Session.</td></tr>';
    _recentLastRenderedSig = '';
    _recentLastRenderedLen = 0;
    return;
  }

  const rows = sortRecentFiles(sessionFilesData);
  const sig = `${recentSortState.key}|${recentSortState.direction}`;
  const dateDescAppendOnly = sig === 'date|desc'
    && _recentLastRenderedSig === sig
    && rows.length > _recentLastRenderedLen
    && tbody.querySelectorAll('.recent-file-row').length === _recentLastRenderedLen;

  let wasAppendOnly = false;
  if (dateDescAppendOnly) {
    // Fast path: only new rows (date desc puts newest on top) — insert them
    // at the top without rebuilding the 5000-row tbody below.
    const added = rows.length - _recentLastRenderedLen;
    let html = '';
    for (let i = 0; i < added; i++) html += _buildRecentRowHtml(rows[i]);
    tbody.insertAdjacentHTML('afterbegin', html);
    wasAppendOnly = true;
  } else {
    tbody.innerHTML = rows.map(_buildRecentRowHtml).join('');
  }
  _recentLastRenderedSig = sig;
  _recentLastRenderedLen = rows.length;

  // Event delegation – bind once, not per-row
  if (!_recentListenersBound) {
    _recentListenersBound = true;
    tbody.addEventListener('click', (e) => {
      const tr = e.target.closest('.recent-file-row');
      if (!tr) return;
      // Clear queue selection when clicking in recent panel — class-toggle only.
      if (selectedJobIds.size > 0) { selectedJobIds.clear(); applyQueueSelectionClasses(); updateQueueActionButtons(); }
      const id = parseInt(tr.dataset.order, 10);
      if (e.ctrlKey || e.metaKey) {
        if (selectedRecentIds.has(id)) selectedRecentIds.delete(id);
        else selectedRecentIds.add(id);
      } else if (e.shiftKey && selectedRecentIds.size > 0) {
        // Reuse the already-sorted array from the sort cache instead of
        // querying every .recent-file-row in the DOM (O(visible) vs O(N)
        // on large panels).
        const sortedOrders = (_recentSortCache.result || sortRecentFiles(sessionFilesData))
          .map(r => r.order);
        const lastIdx = sortedOrders.findIndex(o => selectedRecentIds.has(o));
        const curIdx = sortedOrders.indexOf(id);
        if (lastIdx >= 0 && curIdx >= 0) {
          const from = Math.min(lastIdx, curIdx);
          const to = Math.max(lastIdx, curIdx);
          for (let i = from; i <= to; i++) selectedRecentIds.add(sortedOrders[i]);
        }
      } else {
        selectedRecentIds.clear();
        selectedRecentIds.add(id);
      }
      // Selection change — toggle classes, no tbody rebuild.
      applyRecentSelectionClasses();
    });

    tbody.addEventListener('dblclick', (e) => {
      const tr = e.target.closest('.recent-file-row');
      if (!tr || tr.classList.contains('error')) return;
      const link = tr.dataset.link;
      if (link) { window.api.copyToClipboard(link); showCopyToast('Link kopiert'); }
    });
  }

  // Sort headers only change when the sort state changes — skip on appends.
  if (!wasAppendOnly) updateRecentSortHeaders();
}

function renderHistoryTable(container) {
  if (!container || !historyRowsData.length) {
    if (container) container.innerHTML = '<p class="empty-state">Noch keine Uploads.</p>';
    return;
  }

  const rows = sortHistoryRows(historyRowsData);
  const headerCell = (key, label) => {
    const active = historySortState.key === key;
    const dir = active ? (historySortState.direction === 'asc' ? '▲' : '▼') : '↕';
    return `<th class="sortable${active ? ' active' : ''}" data-history-sort="${key}">${label}<span class="sort-indicator">${dir}</span></th>`;
  };

  let html = `<table class="results-table history-table"><thead><tr>
    ${headerCell('date', 'Date')}${headerCell('filename', 'Filename')}${headerCell('host', 'Host')}${headerCell('link', 'Link')}
  </tr></thead><tbody>`;

  const parts = [html];
  const len = rows.length;
  for (let i = 0; i < len; i++) {
    const row = rows[i];
    const link = row.link || '';
    const date = escapeHtml(row.date);
    const filename = escapeHtml(row.filename);
    const host = escapeHtml(row.host);
    const linkHtml = escapeHtml(link);
    const linkAttr = escapeAttr(link);
    parts.push('<tr class="history-row');
    if (row.isError) parts.push(' error');
    parts.push('" data-link="');
    parts.push(linkAttr);
    parts.push('"><td class="col-date">');
    parts.push(date);
    parts.push('</td><td class="col-filename">');
    parts.push(filename);
    parts.push('</td><td class="col-host">');
    parts.push(host);
    parts.push('</td><td class="col-link">');
    parts.push(linkHtml);
    parts.push('</td></tr>');
  }
  parts.push('</tbody></table>');
  container.innerHTML = parts.join('');

  // Delegated listeners: bind once per render-target instead of once per
  // row/header. With a 5000-row history the per-row bind path was a
  // 5000-iteration synchronous loop on every Verlauf-tab switch — the
  // dominant cause of "tab switching lags" in the user report.
  if (!container.dataset.historyListenersBound) {
    container.dataset.historyListenersBound = '1';
    container.addEventListener('click', (e) => {
      const th = e.target.closest('th.sortable');
      if (th && container.contains(th)) {
        const key = th.dataset.historySort;
        const defaultDir = key === 'date' ? 'desc' : 'asc';
        if (!_historySortClicked || historySortState.key !== key) {
          _historySortClicked = true;
          historySortState.key = key;
          historySortState.direction = defaultDir;
        } else {
          historySortState.direction = historySortState.direction === 'asc' ? 'desc' : 'asc';
        }
        renderHistoryTable(container);
        return;
      }
      const row = e.target.closest('.history-row');
      if (row && !row.classList.contains('error')) {
        const link = row.dataset.link;
        if (link) { window.api.copyToClipboard(link); showCopyToast('Link kopiert'); }
      }
    });
  }
}

function sortHistoryRows(rows) {
  const { key, direction } = historySortState;
  const factor = direction === 'asc' ? 1 : -1;
  return rows.slice().sort((a, b) => {
    const cmp = key === 'date' ? a.dateTs - b.dateTs : _collatorDE.compare(String(a[key] || ''), String(b[key] || ''));
    return (cmp || a.order - b.order) * factor;
  });
}

// Flush pending queue state on window close (sync IPC — blocks until save completes)
window.addEventListener('beforeunload', () => {
  // Flush pending settings save if user changed settings right before closing
  if (settingsSaveTimer) {
    clearTimeout(settingsSaveTimer);
    settingsSaveTimer = null;
    try { saveSettings(); } catch {}
  }
  clearTimeout(queuePersistTimer);
  queuePersistTimer = null;
  // Drain pending done-removals synchronously before persisting so jobs the
  // user expected to disappear (removeFromQueueOnDone=true) don't reappear
  // on next launch. Microtask wouldn't run before the sync IPC below.
  if (_doneRemovalCoalescer) _doneRemovalCoalescer.drainSync();
  const globalSettings = {
    ...(config.globalSettings || {}),
    pendingQueue: buildPersistedQueueState()
  };
  config.globalSettings = globalSettings;
  window.api.saveGlobalSettingsSync(globalSettings);
});

// --- Setup Listeners ---
function setupListeners() {
  document.getElementById('addFilesBtn').addEventListener('click', pickFiles);
  document.getElementById('addFolderBtn').addEventListener('click', pickFolder);
  document.getElementById('startUploadBtn').addEventListener('click', startUpload);
  document.getElementById('startSelectedBtn').addEventListener('click', startSelectedUpload);

  // Recent files sort headers
  document.getElementById('recentFilesHead').addEventListener('click', (e) => {
    const th = e.target.closest('th[data-recent-sort]');
    if (!th) return;
    const key = th.dataset.recentSort;
    const defaultDir = key === 'date' ? 'desc' : 'asc';
    if (!_recentSortClicked || recentSortState.key !== key) {
      _recentSortClicked = true;
      recentSortState.key = key;
      recentSortState.direction = defaultDir;
    } else {
      recentSortState.direction = recentSortState.direction === 'desc' ? 'asc' : 'desc';
    }
    renderRecentUploadsPanel();
  });

  // Recent files context menu
  document.getElementById('recentFilesBody').addEventListener('contextmenu', (e) => {
    const tr = e.target.closest('.recent-file-row');
    if (!tr) return;
    e.preventDefault();
    e.stopPropagation();
    const id = parseInt(tr.dataset.order, 10);
    if (!selectedRecentIds.has(id)) {
      selectedRecentIds.clear();
      selectedRecentIds.add(id);
      renderRecentUploadsPanel();
    }
    const menu = document.getElementById('recentContextMenu');
    menu.style.display = 'block';
    menu.style.left = Math.min(e.clientX, window.innerWidth - 180) + 'px';
    menu.style.top = Math.min(e.clientY, window.innerHeight - 80) + 'px';
  });

  document.getElementById('recentContextMenu').addEventListener('click', (e) => {
    const item = e.target.closest('.ctx-item');
    if (!item) return;
    hideContextMenu();
    const action = item.dataset.action;
    if (action === 'recent-copy-links') copySelectedRecentLinks();
    else if (action === 'recent-delete') deleteSelectedRecentFiles();
  });
  document.getElementById('reuploadSelectedBtn').addEventListener('click', retrySelectedJobs);
  document.getElementById('abortSelectedBtn').addEventListener('click', abortSelectedJobs);
  document.getElementById('finishStopBtn').addEventListener('click', finishUploadsInProgress);
  document.getElementById('abortAllBtn').addEventListener('click', abortAllUploads);
  document.getElementById('moveTopBtn').addEventListener('click', () => moveSelectedJobs('top'));
  document.getElementById('moveUpBtn').addEventListener('click', () => moveSelectedJobs('up'));
  document.getElementById('moveDownBtn').addEventListener('click', () => moveSelectedJobs('down'));
  document.getElementById('moveBottomBtn').addEventListener('click', () => moveSelectedJobs('bottom'));
  document.getElementById('accountsRunHealthCheckBtn').addEventListener('click', () => runHealthCheck('manual'));
  document.getElementById('copyAllLinksBtn').addEventListener('click', copyAllLinks);
  document.getElementById('clearRecentFilesBtn').addEventListener('click', clearAllRecentFiles);
  document.getElementById('exportRecentFilesBtn').addEventListener('click', exportAllRecentFiles);
  document.getElementById('retryFailedBtn').addEventListener('click', () => {
    queueJobs.forEach(j => { if (j.status === 'error') selectedJobIds.add(j.id); });
    retrySelectedJobs();
  });
  document.getElementById('importLogBtn').addEventListener('click', importUploadLog);
  document.getElementById('confirmHosterModalBtn').addEventListener('click', applyHosterSelection);
  document.getElementById('cancelHosterModalBtn').addEventListener('click', cancelHosterModal);
  document.getElementById('closeHosterModalBtn').addEventListener('click', cancelHosterModal);
  document.getElementById('selectAllHostersBtn').addEventListener('click', () => {
    document.querySelectorAll('input[data-hoster-modal]').forEach(input => {
      input.checked = true;
      input.closest('.hoster-option')?.classList.add('selected');
    });
  });
  document.getElementById('clearHostersBtn').addEventListener('click', () => {
    document.querySelectorAll('input[data-hoster-modal]').forEach(input => {
      input.checked = false;
      input.closest('.hoster-option')?.classList.remove('selected');
    });
  });
  document.getElementById('saveSettingsBtn').addEventListener('click', saveSettings);

  document.getElementById('clearHistoryBtn').addEventListener('click', async () => {
    if (!confirm('Verlauf wirklich löschen?')) return;
    await window.api.clearHistory();
    loadHistory();
  });
  document.getElementById('exportHistoryBtn').addEventListener('click', exportHistory);

  // Auto health check toggle
  const autoToggle = document.getElementById('autoHealthCheckToggle');
  if (autoToggle) {
    autoToggle.checked = autoHealthCheckEnabled;
    autoToggle.addEventListener('change', (e) => {
      autoHealthCheckEnabled = !!e.target.checked;
      try { localStorage.setItem(AUTO_CHECK_PREF_KEY, autoHealthCheckEnabled ? '1' : '0'); } catch {}
    });
  }

  // Virtual scroll for large queues
  const queueContainer = document.getElementById('queueContainer');
  if (queueContainer) queueContainer.addEventListener('scroll', _onQueueScroll, { passive: true });

  // Queue table sorting
  document.querySelectorAll('#queueTable th.sortable').forEach(th => {
    th.addEventListener('click', (e) => {
      // Don't sort if click was on the resizer handle
      if (e.target.classList.contains('col-resizer')) return;
      const key = th.dataset.sort;
      if (queueSortState.key === key) queueSortState.direction = queueSortState.direction === 'asc' ? 'desc' : 'asc';
      else { queueSortState.key = key; queueSortState.direction = 'asc'; }
      _lastVisibleRange = { start: -1, end: -1 }; // force full rebuild after re-sort
      renderQueueTable();
    });
  });

  // Queue table column resizing (JDownloader-style)
  setupColumnResizing();

  // Shutdown cancel
  document.getElementById('cancelShutdownBtn').addEventListener('click', async () => {
    await window.api.cancelShutdown();
    if (shutdownCountdownInterval) { clearInterval(shutdownCountdownInterval); shutdownCountdownInterval = null; }
    document.getElementById('shutdownOverlay').style.display = 'none';
  });

  // Click on empty area in queue → deselect all
  document.getElementById('upload-view').addEventListener('click', (e) => {
    if (!e.target.closest('.queue-row') && !e.target.closest('.btn') && !e.target.closest('.context-menu') && !e.target.closest('.recent-files-panel')) {
      if (selectedJobIds.size > 0) {
        selectedJobIds.clear();
        renderQueueTable();
        updateQueueActionButtons();
      }
    }
  });

  // Right-click on upload view background
  document.getElementById('upload-view').addEventListener('contextmenu', (e) => {
    if (e.target.closest('.queue-row')) return; // handled per row
    if (queueJobs.length === 0 && selectedFiles.length === 0) return; // nothing in queue
    e.preventDefault();
    showContextMenu(e.clientX, e.clientY);
  });

  document.getElementById('hosterModal').addEventListener('click', (e) => {
    if (e.target.id === 'hosterModal') cancelHosterModal();
  });

  // Account management
  document.getElementById('addAccountBtn').addEventListener('click', () => openAccountModal(null));
  document.getElementById('closeAccountModalBtn').addEventListener('click', closeAccountModal);
  document.getElementById('cancelAccountModalBtn').addEventListener('click', closeAccountModal);
  document.getElementById('saveAccountBtn').addEventListener('click', saveAccount);
  document.getElementById('accountModal').addEventListener('click', (e) => {
    if (e.target.id === 'accountModal') closeAccountModal();
  });

  // Account hoster select change → update credential fields
  document.getElementById('accountHosterSelect').addEventListener('change', (e) => {
    const opt = HOSTER_ADD_OPTIONS.find(o => o.value === e.target.value);
    const authType = opt ? opt.authType : 'login';
    const credsContainer = document.getElementById('accountCredsFields');
    credsContainer.innerHTML = getCredsFieldsHtml(authType, {}, e.target.value);
    credsContainer.querySelectorAll('.toggle-vis').forEach(btn => {
      btn.addEventListener('click', () => {
        const input = btn.previousElementSibling;
        input.type = input.type === 'password' ? 'text' : 'password';
      });
    });
    document.getElementById('accountModalStatus').textContent = '';
    document.getElementById('accountModalStatus').className = 'account-modal-status';
    // Hoster changed → any prior validation is stale by construction. Drop the
    // snapshot and revert the button so the user has to re-Prüfen.
    _validatedCreds = null;
    const sb = document.getElementById('saveAccountBtn');
    if (sb) sb.textContent = 'Prüfen';
    // The cred inputs were just replaced — rewire invalidation listeners on
    // the fresh elements so post-validation edits still revert the button.
    _wireCredFieldInvalidation();
  });

  // Delete account modal
  document.getElementById('closeDeleteModalBtn').addEventListener('click', closeDeleteModal);
  document.getElementById('cancelDeleteBtn').addEventListener('click', closeDeleteModal);
  document.getElementById('confirmDeleteBtn').addEventListener('click', () => {
    const modal = document.getElementById('deleteAccountModal');
    const accountId = modal.dataset.accountId;
    if (accountId) deleteAccount(accountId);
  });
  document.getElementById('deleteAccountModal').addEventListener('click', (e) => {
    if (e.target.id === 'deleteAccountModal') closeDeleteModal();
  });

  // Job log modal
  document.getElementById('closeJobLogBtn')?.addEventListener('click', hideJobLogModal);
  document.getElementById('closeJobLogBtn2')?.addEventListener('click', hideJobLogModal);
  document.getElementById('copyJobLogBtn')?.addEventListener('click', copyJobLogToClipboard);
  document.getElementById('jobLogModal')?.addEventListener('click', (e) => {
    if (e.target.id === 'jobLogModal') hideJobLogModal();
  });
}

// --- Update UI ---
function showUpdateBanner(info) {
  const banner = document.getElementById('updateBanner');
  const msg = document.getElementById('updateMessage');
  if (!banner || !msg) return;
  msg.textContent = `Update v${info.remoteVersion} verfügbar`;
  banner.style.display = 'flex';
  document.getElementById('installUpdateBtn').onclick = async () => {
    msg.textContent = 'Update wird heruntergeladen...';
    document.getElementById('installUpdateBtn').disabled = true;
    await persistQueueStateNow().catch(() => {}); // Save queue before update restart
    await window.api.installUpdate();
  };
  document.getElementById('dismissUpdateBtn').onclick = () => { banner.style.display = 'none'; };
}

function handleUpdateProgress(data) {
  const msg = document.getElementById('updateMessage');
  if (!msg) return;
  if (data.stage === 'downloading') msg.textContent = `Downloading... ${data.percent || 0}%`;
  else if (data.stage === 'verifying') msg.textContent = 'Verifiziere...';
  else if (data.stage === 'launching') msg.textContent = 'Setup wird gestartet...';
  else if (data.stage === 'done') msg.textContent = 'Update installiert. App wird neu gestartet...';
  else if (data.stage === 'error') {
    msg.textContent = `Update fehlgeschlagen: ${data.error}`;
    const btn = document.getElementById('installUpdateBtn');
    if (btn) { btn.disabled = false; btn.textContent = 'Erneut versuchen'; }
  }
}

// --- Shutdown ---
let shutdownCountdownInterval = null;
function handleShutdownCountdown(data) {
  const overlay = document.getElementById('shutdownOverlay');
  const msgEl = document.getElementById('shutdownMessage');
  const secEl = document.getElementById('shutdownSeconds');
  overlay.style.display = 'flex';

  const labels = { sleep: 'Ruhezustand', shutdown: 'Herunterfahren', restart: 'Neustart' };
  let remaining = data.seconds || 60;
  secEl.textContent = remaining;
  msgEl.textContent = `${labels[data.mode] || data.mode} in ${remaining}s...`;

  if (shutdownCountdownInterval) clearInterval(shutdownCountdownInterval);
  shutdownCountdownInterval = setInterval(() => {
    remaining--;
    secEl.textContent = remaining;
    msgEl.textContent = `${labels[data.mode] || data.mode} in ${remaining}s...`;
    if (remaining <= 0) { clearInterval(shutdownCountdownInterval); }
  }, 1000);
}

// --- Auto-deduplicate restored queue against own upload log on startup ---
async function _autoDeduplicateFromLog() {
  if (queueJobs.length === 0) return;
  try {
    const entries = await window.api.readOwnUploadLog();
    if (!entries || entries.length === 0) return;
    // Only 'done' jobs are dropped here (declutter completed uploads). Pending
    // and failed jobs survive even if their name+hoster is in the log — they're
    // intentional queued work. Decision lives in lib/queue-dedup.js (Node-tested,
    // see tests/queue-dedup.test.js) so it can't silently regress to nuking the
    // whole restored queue on restart/update.
    const { kept, removed } = window.QueueDedup.partitionRestoredJobsByLog(queueJobs, entries);
    if (removed.length > 0) {
      queueJobs = kept;
      for (const job of removed) {
        if (job.file && job.hoster) _completedUploadKeys.add(`${job.file}|${job.hoster}`);
      }
      rebuildJobIndex();
      syncSelectedFilesFromQueue();
      window.api.debugLog(`auto-dedup: removed ${removed.length} already-uploaded (done) jobs from restored queue (${entries.length} log entries)`);
    }
  } catch {}
}

// --- Log import: remove already-uploaded file+hoster combos from queue ---
async function importUploadLog() {
  const result = await window.api.importUploadLog();
  if (!result || result.canceled) return;
  const entries = result.entries || [];
  if (entries.length === 0) {
    showCopyToast('Keine Einträge im Log gefunden');
    return;
  }

  // Build lookup Set: "filename_lower|hoster"
  const logKeys = new Set();
  for (const entry of entries) {
    logKeys.add(`${entry.fileName.toLowerCase()}|${entry.hoster.toLowerCase()}`);
  }

  // Find queue jobs that match (already uploaded)
  let removed = 0;
  queueJobs = queueJobs.filter(job => {
    const key = `${job.fileName.toLowerCase()}|${job.hoster.toLowerCase()}`;
    if (logKeys.has(key) && job.status !== 'done') {
      removeJobFromIndex(job);
      // Mark as completed so buildQueuePreview won't re-create them
      if (job.file && job.hoster) _completedUploadKeys.add(`${job.file}|${job.hoster}`);
      removed++;
      return false;
    }
    return true;
  });

  if (removed > 0) {
    selectedJobIds.clear();
    syncSelectedFilesFromQueue();
    rebuildJobIndex();
    renderQueueTable();
    updateUploadView();
    updateStatusBar();
    persistQueueStateSoon(true);
  }

  showCopyToast(`${removed} bereits hochgeladene Jobs aus Queue entfernt (${entries.length} Log-Einträge gelesen)`);
}

// --- Link operations ---
function copyAllLinks() {
  const rows = queueJobs
    .filter(j => j.status === 'done' && j.result)
    .map(j => ({
      fileName: j.fileName || '',
      hoster: j.hoster || '',
      url: j.result.download_url || j.result.embed_url || ''
    }))
    .filter(r => r.url);
  if (rows.length === 0) return;
  const formatEl = document.getElementById('linkExportFormat');
  const fmt = (formatEl && formatEl.value) || 'plain';
  const text = window.Stats ? window.Stats.formatLinks(rows, fmt) : rows.map(r => r.url).join('\n');
  window.api.copyToClipboard(text);
  showCopyToast(`${rows.length} Link${rows.length === 1 ? '' : 's'} als ${fmt.toUpperCase()} kopiert`);
}

// --- Utilities ---
function formatSize(bytes) {
  if (!bytes || bytes <= 0) return '0 B';
  if (bytes < 1024) return bytes + ' B';
  if (bytes < 1024 * 1024) return (bytes / 1024).toFixed(1) + ' kB';
  if (bytes < 1024 * 1024 * 1024) return (bytes / (1024 * 1024)).toFixed(1) + ' MB';
  return (bytes / (1024 * 1024 * 1024)).toFixed(2) + ' GB';
}

function formatSpeed(kbs) {
  if (!kbs || kbs <= 0) return '0 kB/s';
  if (kbs >= 1024) return (kbs / 1024).toFixed(1) + ' MB/s';
  return Math.round(kbs) + ' kB/s';
}

function formatTime(seconds) {
  if (!seconds || seconds <= 0) return '00:00';
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = seconds % 60;
  if (h > 0) return `${pad(h)}:${pad(m)}:${pad(s)}`;
  return `${pad(m)}:${pad(s)}`;
}

function pad(n) { return String(Math.floor(n)).padStart(2, '0'); }

function formatDateTime(value) {
  const date = value instanceof Date ? value : new Date(value);
  const safeDate = Number.isNaN(date.getTime()) ? new Date() : date;
  return {
    ts: safeDate.getTime(),
    text: safeDate.toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric' })
      + ' ' + safeDate.toLocaleTimeString('de-DE', { hour: '2-digit', minute: '2-digit', second: '2-digit' })
  };
}

function loadAutoCheckPreference() {
  try { const r = localStorage.getItem(AUTO_CHECK_PREF_KEY); return r === null || r === '1'; }
  catch { return true; }
}

// --- Queue table column resizing (JDownloader-style) ---
// Two-tier widths: _idealColumnWidths is what the user set (persisted); the
// displayed widths are scaled proportionally if the window is too narrow to fit
// all ideals (fullscreen → windowed). We never overwrite ideals just because
// the window shrunk — only an explicit drag updates the ideal for that column.
const _idealColumnWidths = {};

function restoreQueueColumnWidths() {
  try {
    const raw = localStorage.getItem(QUEUE_COL_WIDTHS_KEY);
    if (raw) {
      const widths = JSON.parse(raw);
      if (widths && typeof widths === 'object') {
        for (const [col, px] of Object.entries(widths)) {
          if (typeof px === 'number' && px > 20) _idealColumnWidths[col] = px;
        }
      }
    }
    _applyFittedColumnWidths();
  } catch {}
}

function saveDraggedColumnWidth(col, width) {
  // Called from the resizer onUp: the dragged column's new width becomes its
  // new ideal. Other columns keep their saved ideals untouched (so a drag
  // while the window is small doesn't bake the scaled values in).
  if (!col || typeof width !== 'number' || width < 40) return;
  _idealColumnWidths[col] = width;
  try { localStorage.setItem(QUEUE_COL_WIDTHS_KEY, JSON.stringify(_idealColumnWidths)); } catch {}
  _applyFittedColumnWidths();
}

function _applyFittedColumnWidths() {
  const container = document.getElementById('queueContainer');
  if (!container) return;
  const ths = document.querySelectorAll('#queueTable th[data-col]');
  if (!ths.length) return;

  const entries = [];
  let total = 0;
  ths.forEach(th => {
    // Fall back to the column's currently-measured width if no ideal exists
    // yet (first render before the user ever dragged).
    const ideal = _idealColumnWidths[th.dataset.col] || th.getBoundingClientRect().width || 0;
    entries.push({ th, ideal });
    total += ideal;
  });
  if (total <= 0) return;

  const available = container.clientWidth;
  if (available <= 0) return;
  const MIN = 40;

  if (total <= available) {
    entries.forEach(({ th, ideal }) => { th.style.width = ideal + 'px'; });
    return;
  }
  // Scale all columns proportionally so they exactly fit the available width.
  const scale = available / total;
  entries.forEach(({ th, ideal }) => {
    th.style.width = Math.max(MIN, Math.round(ideal * scale)) + 'px';
  });
}

// Debounced window-resize refit. Fires on every window size change — fullscreen
// → windowed, dragging the window edge, monitor unplug — and reshapes columns
// to the new viewport so the user never has to drag the window wider just to
// see a hidden column.
let _columnRefitTimer = null;
window.addEventListener('resize', () => {
  clearTimeout(_columnRefitTimer);
  _columnRefitTimer = setTimeout(_applyFittedColumnWidths, 60);
});

function setupColumnResizing() {
  const headers = document.querySelectorAll('#queueTable th[data-col]');
  headers.forEach(th => {
    const resizer = th.querySelector('.col-resizer');
    if (!resizer) return;

    resizer.addEventListener('mousedown', (e) => {
      e.preventDefault();
      e.stopPropagation();

      const startX = e.clientX;
      const startWidth = th.getBoundingClientRect().width;
      resizer.classList.add('dragging');
      document.body.classList.add('col-resizing');

      const onMove = (ev) => {
        const delta = ev.clientX - startX;
        const newWidth = Math.max(40, startWidth + delta);
        th.style.width = newWidth + 'px';
      };

      const onUp = () => {
        document.removeEventListener('mousemove', onMove);
        document.removeEventListener('mouseup', onUp);
        resizer.classList.remove('dragging');
        document.body.classList.remove('col-resizing');
        // Only the dragged column's new width becomes its new ideal; other
        // columns keep their saved ideals (so dragging while the window is
        // narrow doesn't permanently shrink everything else).
        saveDraggedColumnWidth(th.dataset.col, th.getBoundingClientRect().width);
      };

      document.addEventListener('mousemove', onMove);
      document.addEventListener('mouseup', onUp);
    });
  });
}

// Single-pass escape instead of 4 chained .replace(/x/g, ...) calls.
// Hot path on large table rebuilds — every text cell runs through one of these.
const _HTML_ESC_MAP = { '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;' };
const _HTML_ESC_RE = /[&<>"]/g;
const _ATTR_ESC_MAP = { '&': '&amp;', '"': '&quot;', "'": '&#39;' };
const _ATTR_ESC_RE = /[&"']/g;

function escapeHtml(str) {
  if (!str) return '';
  return String(str).replace(_HTML_ESC_RE, (c) => _HTML_ESC_MAP[c]);
}

function escapeAttr(str) {
  if (!str) return '';
  return String(str).replace(_ATTR_ESC_RE, (c) => _ATTR_ESC_MAP[c]);
}

function showCopyToast(msg, durationMs) {
  const toast = document.getElementById('copyToast');
  toast.textContent = msg;
  toast.classList.add('show');
  clearTimeout(toast._timer);
  toast._timer = setTimeout(() => toast.classList.remove('show'), durationMs || 1500);
}

// --- Resize handle for recent-files panel ---
{
  const resizer = document.getElementById('recentFilesResizer');
  const panel = document.getElementById('recentFilesPanel');
  if (resizer && panel) {
    let startY = 0;
    let startH = 0;

    resizer.addEventListener('mousedown', (e) => {
      e.preventDefault();
      startY = e.clientY;
      startH = panel.getBoundingClientRect().height;
      resizer.classList.add('dragging');
      document.body.style.cursor = 'ns-resize';
      document.body.style.userSelect = 'none';

      const onMove = (e2) => {
        const delta = startY - e2.clientY;
        const newH = Math.max(60, Math.min(window.innerHeight * 0.7, startH + delta));
        panel.style.flex = `0 0 ${newH}px`;
      };

      const onUp = () => {
        document.removeEventListener('mousemove', onMove);
        document.removeEventListener('mouseup', onUp);
        resizer.classList.remove('dragging');
        document.body.style.cursor = '';
        document.body.style.userSelect = '';
      };

      document.addEventListener('mousemove', onMove);
      document.addEventListener('mouseup', onUp);
    });
  }
}

// --- Recent panel tabs ---
document.querySelectorAll('.recent-tab').forEach(tab => {
  tab.addEventListener('click', () => {
    document.querySelectorAll('.recent-tab').forEach(t => t.classList.remove('active'));
    document.querySelectorAll('.recent-tab-body').forEach(b => b.classList.remove('active'));
    tab.classList.add('active');
    const panel = document.getElementById(tab.dataset.panel);
    if (panel) panel.classList.add('active');
    const hint = document.getElementById('recentFilesHint');
    if (hint) hint.textContent = tab.dataset.panel === 'statsTab' ? 'Upload-Statistiken' : 'Zuletzt erzeugte Upload-Links';
  });
});

// --- Stats panel update ---
let statsStartTime = 0;
let statsRunTimer = null;

function formatBytes(bytes) {
  if (bytes <= 0) return '0 B';
  const units = ['B', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.min(Math.floor(Math.log(bytes) / Math.log(1024)), units.length - 1);
  return (bytes / Math.pow(1024, i)).toFixed(i > 0 ? 2 : 0) + ' ' + units[i];
}

function formatDuration(seconds) {
  const h = Math.floor(seconds / 3600);
  const m = Math.floor((seconds % 3600) / 60);
  const s = seconds % 60;
  return `${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`;
}

function updateStatsPanel() {
  const stats = _computeQueueStats();
  const remaining = stats.total - stats.done - stats.errors;

  const el = (id) => document.getElementById(id);
  if (el('statQueueTotal')) el('statQueueTotal').textContent = stats.total;
  if (el('statQueueDone')) el('statQueueDone').textContent = stats.done;
  if (el('statQueueRemaining')) el('statQueueRemaining').textContent = remaining;
  if (el('statQueueInProgress')) el('statQueueInProgress').textContent = stats.inProgress;
  if (el('statQueueError')) el('statQueueError').textContent = stats.errors;
  if (el('statSizeTotal')) el('statSizeTotal').textContent = formatBytes(stats.totalSize);
  if (el('statSizeRemaining')) el('statSizeRemaining').textContent = formatBytes(stats.remainingSize);

  const speed = lastUploadStats.globalSpeedKbs || 0;
  if (el('statSpeed')) el('statSpeed').textContent = speed > 0 ? formatBytes(speed * 1024) + '/s' : '0 B/s';
  if (el('statEta')) {
    if (speed > 0 && stats.remainingSize > 0) {
      el('statEta').textContent = formatDuration(Math.round(stats.remainingSize / (speed * 1024)));
    } else {
      el('statEta').textContent = '--:--';
    }
  }
  if (el('statSessionBytes')) el('statSessionBytes').textContent = formatBytes(lastUploadStats.totalBytes || 0);
}

// --- Start ---
init();