const DIRTY_FIELDS = ['systemName', 'spamInterval', 'footerLeft', 'footerRight', 'aiPrompt', 'aiAutoCheck', 'shareShowMessage', 'shareShowDate', 'shareShowNames', 'shareShowPhotos', 'cookieNoticeText', 'photoResolution', 'photoQuality', 'photoEngine', 'camEnabled', 'trashPurgeDays'];
const SECTION_IDS = ['sec-system', 'sec-brand', 'sec-antispam', 'sec-share', 'sec-ai', 'sec-backup', 'sec-trash', 'sec-form', 'sec-bans'];
const SPAM_MAX = 10080;
const BAN_REASONS = {
  'honeypot': 'Антиспам-поле',
  'login-bruteforce': 'Подбор пароля входа',
  'share-password-bruteforce': 'Подбор пароля ссылки',
  'manual': 'Вручную',
};

let currentLogo = '';
let logoOriginal = '';

function renderLogoPreview() {
  const img = document.getElementById('logoPreviewImg');
  const fb = document.getElementById('logoPreviewFallback');
  const rm = document.getElementById('logoRemoveBtn');
  if (!img || !fb || !rm) return;
  const hasLogo = !!currentLogo;
  img.style.display = hasLogo ? 'block' : 'none';
  fb.style.display = hasLogo ? 'none' : '';
  if (hasLogo) img.src = currentLogo;
  rm.hidden = !hasLogo;
}

function fieldValue(el) {
  return el.type === 'checkbox' ? String(el.checked) : el.value;
}

function setBtnLoading(btn, on, spinnerClass) {
  if (on) {
    btn.dataset.label = btn.innerHTML;
    btn.disabled = true;
    const cls = spinnerClass || (btn.classList.contains('ghost') ? 'dark' : '');
    btn.innerHTML = `<span class="spinner ${cls}"></span> ${btn.dataset.loadingText || 'Обработка...'}`;
  } else {
    btn.disabled = false;
    btn.innerHTML = btn.dataset.label || btn.innerHTML;
  }
}

function showError(msg) {
  const t = document.getElementById('toast');
  if (!t) return;
  t.textContent = msg;
  t.classList.add('show', 'error');
  clearTimeout(t._errTimer);
  t._errTimer = setTimeout(() => t.classList.remove('error'), 3400);
}

function showFieldError(id, msg) {
  const el = document.getElementById(id);
  const err = document.getElementById(`${id}Error`);
  if (el) el.classList.add('invalid');
  if (err) { err.textContent = msg; err.hidden = false; }
}

function clearFieldError(id) {
  const el = document.getElementById(id);
  const err = document.getElementById(`${id}Error`);
  if (el) el.classList.remove('invalid');
  if (err) err.hidden = true;
}

function plural(n, one, few, many) {
  const a = n % 10, b = n % 100;
  if (a === 1 && b !== 11) return one;
  if (a >= 2 && a <= 4 && (b < 12 || b > 14)) return few;
  return many;
}

function humanizeMinutes(min) {
  const n = Number(min);
  if (!Number.isFinite(n) || n < 1) return '';
  if (n === 1440) return 'сутки';
  if (n > 1440 && n % 1440 === 0) {
    const d = n / 1440;
    return `${d} ${plural(d, 'сутки', 'суток', 'суток')}`;
  }
  const h = Math.floor(n / 60);
  const m = n % 60;
  const parts = [];
  if (h) parts.push(`${h} ${plural(h, 'час', 'часа', 'часов')}`);
  if (m) parts.push(`${m} ${plural(m, 'минута', 'минуты', 'минут')}`);
  if (!parts.length) parts.push(`${n} ${plural(n, 'минута', 'минуты', 'минут')}`);
  return parts.join(' ');
}

function updateDirty() {
  const dirtyCount = DIRTY_FIELDS.filter(id => {
    const el = document.getElementById(id);
    return String(el.dataset.original ?? '') !== fieldValue(el);
  }).length;
  document.getElementById('saveBar').classList.toggle('show', dirtyCount > 0);
}

function bindDirty() {
  DIRTY_FIELDS.forEach(id => {
    const el = document.getElementById(id);
    el.addEventListener('input', updateDirty);
    el.addEventListener('change', updateDirty);
  });
}

function snapshotDirty() {
  DIRTY_FIELDS.forEach(id => {
    document.getElementById(id).dataset.original = fieldValue(document.getElementById(id));
  });
  updateDirty();
}

function revertChanges() {
  DIRTY_FIELDS.forEach(id => {
    const el = document.getElementById(id);
    const original = el.dataset.original ?? '';
    if (el.type === 'checkbox') el.checked = original === 'true';
    else el.value = original;
  });
  currentLogo = logoOriginal;
  renderLogoPreview();
  clearFieldError('spamInterval');
  updateSpamUi();
  updateDirty();
  showToast('Изменения отменены');
}

function initSectionNav() {
  const nav = document.getElementById('settingsNav');
  if (!nav) return;
  const links = [...nav.querySelectorAll('a')];
  const smooth = window.matchMedia('(prefers-reduced-motion: reduce)').matches ? 'auto' : 'smooth';
  let ticking = false;
  const setActive = () => {
    ticking = false;
    let current = SECTION_IDS[0];
    for (const id of SECTION_IDS) {
      const el = document.getElementById(id);
      if (el && el.getBoundingClientRect().top <= 170) current = id;
    }
    links.forEach(a => a.classList.toggle('active', a.getAttribute('href') === `#${current}`));
  };
  window.addEventListener('scroll', () => {
    if (!ticking) { ticking = true; requestAnimationFrame(setActive); }
  }, { passive: true });
  setActive();
  nav.addEventListener('click', e => {
    const a = e.target.closest('a');
    if (!a) return;
    e.preventDefault();
    const target = document.getElementById(a.getAttribute('href').slice(1));
    if (target) target.scrollIntoView({ behavior: smooth, block: 'start' });
    history.replaceState(null, '', a.getAttribute('href'));
  });
}

async function loadSettings() {
  const [sRes, stRes] = await Promise.all([
    fetch(`${API}/api/settings`, { headers: hdr() }),
    fetch(`${API}/api/stats`, { headers: hdr() }),
  ]);
  if (!sRes.ok) { showError('Не удалось загрузить настройки'); return; }
  const s = await sRes.json();
  document.getElementById('systemName').value = s.system_name !== undefined ? s.system_name : 'WhatIDo';
  currentLogo = s.system_logo || '';
  logoOriginal = currentLogo;
  renderLogoPreview();
  if (s.spam_interval_min !== undefined) document.getElementById('spamInterval').value = s.spam_interval_min;
  document.getElementById('trashPurgeDays').value = s.trash_purge_days !== undefined ? s.trash_purge_days : '30';
  document.getElementById('footerLeft').value = s.footer_left || '';
  document.getElementById('footerRight').value = s.footer_right || '';
  document.getElementById('aiPrompt').value = s.ai_prompt || '';
  document.getElementById('aiAutoCheck').checked = s.ai_autocheck_enabled !== 'false';
  document.getElementById('shareShowMessage').checked = s.share_show_student_message === 'true';
  document.getElementById('shareShowDate').checked = s.share_show_entry_date === 'true';
  document.getElementById('shareShowNames').checked = s.share_show_student_names !== 'false';
  document.getElementById('shareShowPhotos').checked = s.share_show_group_photos !== 'false';
  document.getElementById('cookieNoticeText').value = s.cookie_notice_text || '';
  const pr = document.getElementById('photoResolution');
  if (s.photo_capture_resolution) pr.value = s.photo_capture_resolution;
  if (!pr.value) pr.value = '640x480';
  document.getElementById('photoQuality').value = s.photo_capture_quality !== undefined && s.photo_capture_quality !== '' ? s.photo_capture_quality : '0.92';
  const pe = document.getElementById('photoEngine');
  pe.value = ['auto', 'server', 'client'].includes(s.photo_enhance_engine) ? s.photo_enhance_engine : 'auto';
  if (!pe.value) pe.value = 'auto';
  document.getElementById('camEnabled').checked = s.camera_enabled !== 'false';
  snapshotDirty();
  updateSpamUi();
  loadAiQueue();
  loadAiProfiles();
  renderStats(stRes);
  loadSystemInfo();
}

async function renderStats(res) {
  const el = document.getElementById('dataStats');
  if (!el) return;
  if (!res || !res.ok) { el.innerHTML = '<span class="chip">Статистика недоступна</span>'; return; }
  const st = await res.json();
  el.innerHTML = `
    <span class="chip">Записей: <b>${st.entries}</b></span>
    <span class="chip">Учеников: <b>${st.students}</b></span>
    <span class="chip">Групп: <b>${st.groups}</b></span>
    <span class="chip">Сегодня: <b>${st.today}</b></span>
    ${st.trash ? `<span class="chip">В корзине: <b>${st.trash}</b> <a href="trash.html">→</a></span>` : ''}
  `;
}

async function refreshStats() {
  const el = document.getElementById('dataStats');
  if (!el) return;
  el.innerHTML = '<span class="chip">Обновление…</span>';
  try {
    await renderStats(await fetch(`${API}/api/stats`, { headers: hdr() }));
  } catch {
    el.innerHTML = '<span class="chip">Ошибка сети</span>';
  }
}

async function loadSystemInfo() {
  const el = document.getElementById('systemInfo');
  if (!el) return;
  try {
    const res = await fetch(`${API}/api/system-info`, { headers: hdr() });
    if (res.ok) {
      renderSystemInfo(await res.json());
      const live = document.getElementById('systemLive');
      if (live) live.textContent = 'обновлено ' + new Date().toLocaleTimeString('ru', { hour: '2-digit', minute: '2-digit' });
      return;
    }
    el.innerHTML = '<div class="sys-card err">Ошибка загрузки</div>';
  } catch {
    el.innerHTML = '<div class="sys-card err">Ошибка сети</div>';
  }
}

function renderSystemInfo(si) {
  const db = si.database || {};
  const photos = si.photos || {};
  const files = si.files || {};
  const uploads = si.uploads || {};
  const disk = si.disk;

  let tablesHtml = '';
  if (db.tables && db.tables.length) {
    tablesHtml = '<details class="sys-details"><summary>Таблицы БД</summary><div class="sys-table-list">' +
      db.tables.map(t => `<div class="sys-table-row"><span>${esc(t.name)}</span><span>${esc(t.size)}</span></div>`).join('') +
      '</div></details>';
  }

  let diskHtml = '';
  if (disk) {
    const pct = disk.used_pct;
    const color = pct > 90 ? '#ef4444' : pct > 70 ? '#f59e0b' : '#16a34a';
    const cardCls = pct > 90 ? ' danger' : pct > 70 ? ' warn' : '';
    diskHtml = `
    <div class="sys-card${cardCls}">
      <div class="sys-title">Диск</div>
      <div class="sys-item"><span class="sys-label">Заполнено</span><span class="sys-value">${pct}%</span></div>
      <div class="sys-item"><span class="sys-label">Использовано</span><span class="sys-value">${esc(disk.used)} / ${esc(disk.total)}</span></div>
      <div class="sys-bar-wrap"><div class="sys-bar" style="width:${pct}%; background:${color}"></div></div>
      <div class="sys-meta">Свободно: ${esc(disk.free)} (${100 - pct}%)</div>
    </div>`;
  }

  document.getElementById('systemInfo').innerHTML = `
    <div class="sys-card">
      <div class="sys-title">База данных</div>
      <div class="sys-item"><span class="sys-label">Размер</span><span class="sys-value">${esc(db.size || '—')}</span></div>
      ${tablesHtml}
    </div>
    <div class="sys-card">
      <div class="sys-title">Фото</div>
      <div class="sys-item"><span class="sys-label">Фото групп</span><span class="sys-value">${photos.group_photos?.count || 0} · ${esc(photos.group_photos?.size || '0 B')}</span></div>
      <div class="sys-item"><span class="sys-label">Фото в записях</span><span class="sys-value">${photos.entry_photos?.count || 0} · ${esc(photos.entry_photos?.size || '0 B')}</span></div>
      <div class="sys-item"><span class="sys-label">Всего</span><span class="sys-value"><b>${photos.total_count || 0}</b> · <b>${esc(photos.total_size || '0 B')}</b></span></div>
    </div>
    <div class="sys-card">
      <div class="sys-title">Файлы</div>
      <div class="sys-item"><span class="sys-label">Проектные файлы</span><span class="sys-value">${files.project_files?.count || 0}</span></div>
    </div>
    <div class="sys-card">
      <div class="sys-title">Загрузки</div>
      <div class="sys-item"><span class="sys-label">Файлов</span><span class="sys-value">${uploads.count || 0}</span></div>
      <div class="sys-item"><span class="sys-label">Размер</span><span class="sys-value">${esc(uploads.size || '0 B')}</span></div>
    </div>
    ${diskHtml || '<div class="sys-card"><div class="sys-title">Диск</div><div class="sys-meta">Недоступно</div></div>'}
  `;
}

async function loadAiProfiles() {
  const listEl = document.getElementById('aiProfilesList');
  const select = document.getElementById('aiActiveProfile');
  if (!listEl) return;
  try {
    const res = await fetch(`${API}/api/ai/profiles`, { headers: hdr() });
    if (!res.ok) { listEl.innerHTML = '<span class="chip">Не удалось загрузить профили</span>'; return; }
    const data = await res.json();
    const profiles = data.profiles || [];
    if (select) {
      select.innerHTML = `<option value="native">Нативная — ${esc(data.native.model)}</option>` +
        profiles.map(p => `<option value="${esc(p.id)}">${esc(p.name)} — ${esc(p.model)}</option>`).join('');
      select.value = data.active;
    }
    const items = [{ id: 'native', name: 'Нативная (llama.cpp в Docker)', base_url: data.native.base_url, model: data.native.model, native: true }].concat(profiles);
    listEl.innerHTML = items.map(p => `
      <div class="ai-profile-item${data.active === p.id ? ' active' : ''}">
        <div class="pi-info">
          <div class="pi-name">${esc(p.name)}${data.active === p.id ? ' <span class="pi-badge">по умолчанию</span>' : ''}</div>
          <div class="pi-meta">${esc(p.model)} · ${esc(p.base_url)}${p.max_tokens ? ` · max_tokens: ${esc(p.max_tokens)}` : ''}</div>
        </div>
        <div class="pi-actions">
          ${p.native ? '' : `<button type="button" class="pi-btn" data-edit-profile="${esc(p.id)}">Изменить</button>`}
          ${p.native ? '' : `<button type="button" class="pi-btn danger" data-del-profile="${esc(p.id)}" data-del-name="${esc(p.name)}">Удалить</button>`}
        </div>
      </div>
    `).join('');
  } catch { listEl.innerHTML = '<span class="chip">Ошибка загрузки</span>'; }
}

let aiProfileEditingId = null;

function openAiProfileForm(profile) {
  aiProfileEditingId = profile ? profile.id : null;
  document.getElementById('aiProfileModalTitle').textContent = profile ? 'Изменить профиль ИИ' : 'Добавить профиль ИИ';
  document.getElementById('aiProfileModal').classList.add('open');
  document.getElementById('aiProfileName').value = profile ? profile.name : '';
  document.getElementById('aiProfileModel').value = profile ? profile.model : '';
  document.getElementById('aiProfileBaseUrl').value = profile ? profile.base_url : '';
  document.getElementById('aiProfileApiKey').value = '';
  document.getElementById('aiProfileMaxTokens').value = profile && profile.max_tokens ? profile.max_tokens : '';
  document.getElementById('aiProfileTestStatus').textContent = '';
  document.getElementById('aiProfileName').focus();
}

function closeAiProfileForm() {
  aiProfileEditingId = null;
  document.getElementById('aiProfileModal').classList.remove('open');
}

function aiProfileFormData() {
  return {
    name: document.getElementById('aiProfileName').value,
    model: document.getElementById('aiProfileModel').value,
    base_url: document.getElementById('aiProfileBaseUrl').value,
    api_key: document.getElementById('aiProfileApiKey').value,
    max_tokens: document.getElementById('aiProfileMaxTokens').value.trim() === '' ? null : document.getElementById('aiProfileMaxTokens').value,
  };
}

async function loadAiQueue() {
  const el = document.getElementById('aiQueueInfo');
  if (!el) return;
  try {
    const res = await fetch(`${API}/api/ai/queue`, { headers: hdr() });
    if (!res.ok) { el.textContent = ''; return; }
    const q = await res.json();
    const c = q.counts || {};
    el.innerHTML = `
      <span class="chip">Автопроверка: <b>${q.enabled ? 'включена' : 'выключена'}</b></span>
      <span class="chip">Модель: <b>${esc(q.model || '—')}</b></span>
      <span class="chip">В очереди: <b>${c.pending || 0}</b></span>
      <span class="chip">Проверено: <b>${c.done || 0}</b></span>
      <span class="chip">Ошибок: <b>${c.error || 0}</b></span>
      <span class="chip">Пропущено: <b>${c.skipped || 0}</b></span>
      <a class="queue-link" href="worker.html">Монитор воркера →</a>`;
  } catch { el.textContent = ''; }
}

async function saveAiProfile() {
  const body = aiProfileFormData();
  const st = document.getElementById('aiProfileTestStatus');
  st.innerHTML = '<span class="spinner dark"></span> Сохранение...';
  const res = await fetch(aiProfileEditingId ? `${API}/api/ai/profiles/${aiProfileEditingId}` : `${API}/api/ai/profiles`, {
    method: aiProfileEditingId ? 'PUT' : 'POST',
    headers: hdrJson(),
    body: JSON.stringify(body),
  });
  if (res.ok) {
    st.textContent = '';
    showToast(aiProfileEditingId ? 'Профиль обновлён' : 'Профиль добавлен');
    closeAiProfileForm();
    loadAiProfiles();
  } else {
    const err = await res.json().catch(() => ({}));
    st.innerHTML = `<span class="fail">${esc(err.error || 'Ошибка сохранения')}</span>`;
  }
}

async function testAiProfile() {
  const st = document.getElementById('aiProfileTestStatus');
  st.textContent = 'Проверка…';
  const res = await fetch(`${API}/api/ai/profiles/test`, { method: 'POST', headers: hdrJson(), body: JSON.stringify(aiProfileFormData()) });
  const d = await res.json().catch(() => ({ ok: false, error: 'Ошибка' }));
  st.innerHTML = d.ok
    ? `<span class="ok">✓ Работает (${d.latency_ms} мс)${d.sample ? ` — «${esc(d.sample)}»` : ''}</span>`
    : `<span class="fail">✗ ${esc(d.error || 'Не удалось подключиться')}</span>`;
}

async function activateAiProfile(id) {
  const res = await fetch(`${API}/api/ai/profiles/activate`, { method: 'POST', headers: hdrJson(), body: JSON.stringify({ id }) });
  if (res.ok) {
    showToast('Модель по умолчанию обновлена');
    loadAiProfiles();
    loadAiQueue();
  } else {
    const err = await res.json().catch(() => ({}));
    showError(err.error || 'Ошибка');
  }
}

async function deleteAiProfile(id, name, btn) {
  if (btn && !btn.dataset.confirming) {
    btn.dataset.confirming = '1';
    btn.classList.add('confirming');
    btn.textContent = 'Точно?';
    setTimeout(() => {
      if (btn.isConnected) {
        delete btn.dataset.confirming;
        btn.classList.remove('confirming');
        btn.textContent = 'Удалить';
      }
    }, 3000);
    return;
  }
  const res = await fetch(`${API}/api/ai/profiles/${id}`, { method: 'DELETE', headers: hdr() });
  if (res.ok) {
    showToast('Профиль удалён');
    loadAiProfiles();
  } else {
    const err = await res.json().catch(() => ({}));
    showError(err.error || 'Ошибка удаления');
  }
}

const spamInput = document.getElementById('spamInterval');

function updateSpamUi() {
  const raw = spamInput.value;
  const n = Math.round(Number(raw));
  const valid = raw !== '' && Number.isFinite(n) && n >= 1;
  const hint = document.getElementById('spamIntervalHint');
  if (hint) hint.textContent = valid ? `Следующая отправка будет доступна через ${humanizeMinutes(n)}` : 'Минимальное значение — 1 минута';
  document.querySelectorAll('#spamPresets .preset-btn').forEach(b => b.classList.toggle('active', valid && Number(b.dataset.min) === n));
}

function clampSpam(v) {
  let n = Math.round(Number(v));
  if (!Number.isFinite(n) || n < 1) n = 1;
  if (n > SPAM_MAX) n = SPAM_MAX;
  return n;
}

spamInput.addEventListener('change', () => {
  const n = Math.round(Number(spamInput.value));
  if (spamInput.value === '' || !Number.isFinite(n) || n < 1) {
    spamInput.value = clampSpam(spamInput.dataset.original ?? 30);
    updateDirty();
  }
  updateSpamUi();
});
spamInput.addEventListener('input', updateSpamUi);

document.getElementById('spamPresets').addEventListener('click', e => {
  const btn = e.target.closest('[data-min]');
  if (!btn) return;
  spamInput.value = btn.dataset.min;
  spamInput.dispatchEvent(new Event('input', { bubbles: true }));
  spamInput.dispatchEvent(new Event('change', { bubbles: true }));
});

document.getElementById('aiProfileAddBtn').addEventListener('click', () => openAiProfileForm(null));
document.getElementById('aiProfileSaveBtn').addEventListener('click', saveAiProfile);
document.getElementById('aiProfileTestBtn').addEventListener('click', testAiProfile);
document.getElementById('aiProfileCancelBtn').addEventListener('click', closeAiProfileForm);
document.getElementById('aiProfileModal').addEventListener('click', e => { if (e.target === e.currentTarget) closeAiProfileForm(); });
document.getElementById('aiActiveProfile').addEventListener('change', e => activateAiProfile(e.target.value));
document.getElementById('aiProfilesList').addEventListener('click', e => {
  const del = e.target.closest('[data-del-profile]');
  if (del) { deleteAiProfile(del.dataset.delProfile, del.dataset.delName, del); return; }
  const edit = e.target.closest('[data-edit-profile]');
  if (edit) {
    fetch(`${API}/api/ai/profiles`, { headers: hdr() })
      .then(r => r.json())
      .then(data => {
        const p = (data.profiles || []).find(x => x.id === edit.dataset.editProfile);
        if (p) openAiProfileForm(p);
      });
  }
});

document.addEventListener('keydown', e => {
  if (e.key === 'Escape' && document.getElementById('aiProfileModal').classList.contains('open')) closeAiProfileForm();
});

async function saveSettings() {
  const v = spamInput.value;
  const n = Number(v);
  if (v === '' || !Number.isFinite(n) || Math.round(n) < 1) {
    showFieldError('spamInterval', 'Укажите целое число минут (минимум 1)');
    spamInput.focus();
    showError('Проверьте поле «Интервал ожидания»');
    return;
  }
  clearFieldError('spamInterval');
  const trashValue = document.getElementById('trashPurgeDays').value;
  const trashDays = Math.round(Number(trashValue));
  if (trashValue === '' || !Number.isFinite(trashDays) || trashDays < 1 || trashDays > 365) {
    showError('Проверьте поле «Время до безвозвратного удаления» (от 1 до 365 дней)');
    return;
  }
  const btn = document.getElementById('saveBtn');
  btn.dataset.loadingText = 'Сохранение...';
  setBtnLoading(btn, true);
  try {
    const res = await fetch(`${API}/api/settings`, {
      method: 'PUT',
      headers: hdrJson(),
      body: JSON.stringify({ settings: {
        system_name: document.getElementById('systemName').value.trim(),
        spam_interval_min: String(Math.round(Number(v))),
        footer_left: document.getElementById('footerLeft').value.trim(),
        footer_right: document.getElementById('footerRight').value.trim(),
        ai_prompt: document.getElementById('aiPrompt').value.trim(),
        ai_autocheck_enabled: document.getElementById('aiAutoCheck').checked ? 'true' : 'false',
        share_show_student_message: document.getElementById('shareShowMessage').checked ? 'true' : 'false',
        share_show_entry_date: document.getElementById('shareShowDate').checked ? 'true' : 'false',
        share_show_student_names: document.getElementById('shareShowNames').checked ? 'true' : 'false',
        share_show_group_photos: document.getElementById('shareShowPhotos').checked ? 'true' : 'false',
        cookie_notice_text: document.getElementById('cookieNoticeText').value.trim(),
        photo_capture_resolution: document.getElementById('photoResolution').value,
        photo_capture_quality: String(document.getElementById('photoQuality').value),
        photo_enhance_engine: document.getElementById('photoEngine').value,
        camera_enabled: document.getElementById('camEnabled').checked ? 'true' : 'false',
        trash_purge_days: String(trashDays),
      } })
    });
    if (res.ok) {
      showToast('Настройки сохранены');
      logoOriginal = currentLogo;
      snapshotDirty();
      updateSpamUi();
    } else {
      const e = await res.json().catch(() => ({}));
      showError(e.error || 'Ошибка сохранения');
    }
  } catch {
    showError('Ошибка сети при сохранении');
  } finally {
    setBtnLoading(btn, false);
  }
}

function formatBackupSize(b) {
  if (!b || b < 0) return '';
  if (b >= 1073741824) return (b / 1073741824).toFixed(2) + ' ГБ';
  return (b / 1048576).toFixed(1) + ' МБ';
}

async function downloadBackup() {
  const btn = document.getElementById('backupBtn');
  const st = document.getElementById('backupStatus');
  btn.dataset.loadingText = 'Формирование...';
  setBtnLoading(btn, true);
  if (st) { st.classList.remove('err'); st.textContent = 'Формирование архива на сервере…'; }
  try {
    const res = await fetch(`${API}/api/backup`, { method: 'POST', headers: hdr() });
    const data = await res.json().catch(() => ({}));
    if (!res.ok) {
      if (st) { st.classList.add('err'); st.textContent = 'Не удалось сформировать бэкап'; }
      showError('Ошибка формирования бэкапа: ' + (data.error || res.status));
      return;
    }
    const head = await fetch(data.url, { method: 'HEAD' }).catch(() => null);
    if (head && !head.ok) {
      if (st) { st.classList.add('err'); st.textContent = 'Ссылка на архив устарела, попробуйте ещё раз'; }
      showError('Ошибка скачивания бэкапа');
      return;
    }
    const a = document.createElement('a');
    a.href = data.url;
    a.download = data.filename || 'whatido-backup.tar.gz';
    document.body.appendChild(a);
    a.click();
    a.remove();
    const size = formatBackupSize(data.size);
    if (st) st.textContent = `Архив ${data.filename}${size ? ` (${size})` : ''} — скачивается браузером`;
    showToast('Бэкап сформирован' + (size ? ': ' + size : ''));
  } catch (err) {
    if (st) { st.classList.add('err'); st.textContent = 'Не удалось сформировать бэкап: ' + err.message; }
    showError('Ошибка сети при формировании бэкапа');
  } finally {
    setBtnLoading(btn, false);
  }
}

document.getElementById('restoreFile').addEventListener('change', async (e) => {
  const file = e.target.files[0];
  if (!file) return;
  if (!confirm('Восстановление заменит все текущие данные. Продолжить?')) { e.target.value = ''; return; }
  const st = document.getElementById('restoreStatus');
  const backupBtn = document.getElementById('backupBtn');
  const restoreBtn = document.getElementById('restoreBtn');
  st.classList.remove('err');
  st.innerHTML = '<span class="spinner dark"></span> Восстановление...';
  backupBtn.disabled = true;
  restoreBtn.disabled = true;
  const fd = new FormData();
  fd.append('backup', file);
  let res;
  try {
    res = await fetch(`${API}/api/restore`, { method: 'POST', headers: hdr(), body: fd });
  } catch (err) {
    st.textContent = '';
    showError('Ошибка сети: ' + err.message);
    e.target.value = '';
    return;
  } finally {
    backupBtn.disabled = false;
    restoreBtn.disabled = false;
  }
  if (res.ok) {
    showToast('Данные восстановлены');
    st.textContent = '';
    loadSettings();
  } else {
    st.classList.add('err');
    st.innerHTML = 'Ошибка восстановления';
    showError(await res.text());
  }
  e.target.value = '';
});

async function loadBans() {
  const el = document.getElementById('bansList');
  const res = await fetch(`${API}/api/bans`, { headers: hdr() });
  if (res.status === 403) { document.getElementById('sec-bans').style.display = 'none'; return; }
  if (!res.ok) { el.innerHTML = '<span class="chip">Не удалось загрузить</span>'; return; }
  const bans = await res.json();
  if (!bans.length) { el.innerHTML = '<span class="chip">Активных блокировок нет</span>'; return; }
  el.innerHTML = bans.map(b => `
    <span class="chip ban-chip" data-chip="${esc(b.ip)}">
      <b>${esc(b.ip)}</b>
      <span class="chip-sub">${esc(BAN_REASONS[b.reason] || b.reason || '—')} · до ${new Date(b.banned_until).toLocaleString('ru')}</span>
      <button type="button" class="unban-btn" data-unban="${esc(b.ip)}" title="Разблокировать" aria-label="Разблокировать ${esc(b.ip)}">✕</button>
    </span>`).join('');
}

async function doUnban(ip) {
  const res = await fetch(`${API}/api/bans/${encodeURIComponent(ip)}`, { method: 'DELETE', headers: hdr() });
  if (res.ok) { showToast('IP разблокирован: ' + ip); loadBans(); }
  else showError('Ошибка разблокировки');
}

document.getElementById('bansList').addEventListener('click', e => {
  const btn = e.target.closest('[data-unban]');
  if (!btn) return;
  const ip = btn.dataset.unban;
  const chip = btn.closest('[data-chip]');
  if (!chip || chip.dataset.confirming) return;
  chip.dataset.confirming = '1';
  chip.classList.add('confirming');
  btn.outerHTML = `
    <span class="chip-confirm">
      Разблокировать?
      <button type="button" class="chip-yes" data-unban-yes>Да</button>
      <button type="button" class="chip-no" data-unban-no>Нет</button>
    </span>`;
  chip.querySelector('[data-unban-yes]').addEventListener('click', () => doUnban(ip));
  chip.querySelector('[data-unban-no]').addEventListener('click', () => loadBans());
});

document.getElementById('backupBtn').addEventListener('click', downloadBackup);
document.getElementById('restoreBtn').addEventListener('click', () => document.getElementById('restoreFile').click());
document.getElementById('saveBtn').addEventListener('click', saveSettings);
document.getElementById('resetBtn').addEventListener('click', revertChanges);

const systemRefreshBtn = document.getElementById('systemRefreshBtn');
if (systemRefreshBtn) systemRefreshBtn.addEventListener('click', async () => {
  systemRefreshBtn.classList.add('spinning');
  await loadSystemInfo();
  systemRefreshBtn.classList.remove('spinning');
});

const statsRefreshBtn = document.getElementById('statsRefreshBtn');
if (statsRefreshBtn) statsRefreshBtn.addEventListener('click', async () => {
  statsRefreshBtn.classList.add('spinning');
  await refreshStats();
  statsRefreshBtn.classList.remove('spinning');
});

function logoStatusText(html) {
  const st = document.getElementById('logoUploadStatus');
  if (st) st.innerHTML = html;
}

document.getElementById('logoUploadBtn').addEventListener('click', () => document.getElementById('logoInput').click());

document.getElementById('logoInput').addEventListener('change', async (e) => {
  const file = e.target.files[0];
  if (!file) return;
  const btn = document.getElementById('logoUploadBtn');
  if (file.size > 1024 * 1024) {
    e.target.value = '';
    showError('Логотип не должен превышать 1 МБ');
    return;
  }
  btn.disabled = true;
  logoStatusText('<span class="spinner dark"></span> Загрузка...');
  try {
    const fd = new FormData();
    fd.append('logo', file);
    const res = await fetch(`${API}/api/settings/logo`, { method: 'POST', headers: hdr(), body: fd });
    const d = await res.json().catch(() => ({}));
    if (res.ok) {
      currentLogo = d.system_logo || '';
      renderLogoPreview();
      logoStatusText('');
      showToast('Логотип обновлён');
    } else {
      logoStatusText(`<span class="fail">${esc(d.error || 'Ошибка загрузки')}</span>`);
    }
  } catch {
    logoStatusText('<span class="fail">Ошибка сети</span>');
  } finally {
    btn.disabled = false;
    e.target.value = '';
  }
});

document.getElementById('logoRemoveBtn').addEventListener('click', async () => {
  if (!confirm('Удалить логотип? Название системы сохранится.')) return;
  logoStatusText('<span class="spinner dark"></span> Удаление...');
  try {
    const res = await fetch(`${API}/api/settings/logo`, { method: 'DELETE', headers: hdr() });
    if (res.ok) {
      currentLogo = '';
      logoOriginal = '';
      renderLogoPreview();
      logoStatusText('');
      showToast('Логотип удалён');
    } else {
      logoStatusText('<span class="fail">Ошибка удаления</span>');
    }
  } catch {
    logoStatusText('<span class="fail">Ошибка сети</span>');
  }
});

document.addEventListener('keydown', e => {
  if ((e.ctrlKey || e.metaKey) && e.key.toLowerCase() === 's') {
    e.preventDefault();
    const modal = document.getElementById('aiProfileModal');
    const saveBtn = document.getElementById('saveBtn');
    if (!modal.classList.contains('open') && document.getElementById('saveBar').classList.contains('show') && !saveBtn.disabled) saveSettings();
  }
});

window.addEventListener('beforeunload', e => {
  if (document.getElementById('saveBar').classList.contains('show')) {
    e.preventDefault();
    e.returnValue = '';
  }
});

(async () => {
  if (await requireAdminPage()) {
    buildSidebar(document.body.dataset.page);
    bindDirty();
    initSectionNav();
    updateSpamUi();
    const authStatus = document.getElementById('authStatus');
    try {
      await loadSettings();
      if (authStatus) authStatus.classList.add('loaded');
    } catch {
      if (authStatus) { authStatus.classList.remove('loaded'); authStatus.classList.add('err'); authStatus.textContent = 'Ошибка загрузки настроек'; }
    }
    loadBans();
  }
})();