let currentEntries = [];
let seenEntryIds = new Set();
let highlightNewIds = new Set();
let highlightClearTimer = null;
let editId = null;
let editGroups = [];
let groupsLoaded = false;
let studentsLoaded = false;
const PAGE_SIZE = 20;
let page = 1;
let totalEntries = 0;
let searchTimer = null;
let view = localStorage.getItem('journalView') === 'cards' ? 'cards' : 'list';
let aiCorrecting = false;
let editDeletePhoto = false;
let linkSettings = null;

async function loadLinkSettings() {
  if (!linkSettings) {
    const res = await fetch(`${API}/api/settings`, { headers: hdr() });
    linkSettings = await res.json().catch(() => ({}));
  }
  return linkSettings;
}

function isImageFile(name) {
  return /\.(jpe?g|jfif|png|gif|webp|bmp|avif|svg|ico)$/i.test(name || '');
}

function mainPhotoPath(e) {
  if (e.photo_path) return e.photo_path;
  if (e.photos && e.photos.length) return e.photos[0].photo_path;
  return null;
}

function filesHTML(files) {
  if (!files || !files.length) return '';
  return `<div class="entry-files">${files.map(f => {
    const link = isImageFile(f.name)
      ? `<a class="f-link" href="#" data-img="${API}/api/files/${f.token}" title="Открыть">${esc(f.name)}</a>`
      : `<a class="f-link" href="${API}/api/files/${f.token}" download title="Скачать">${esc(f.name)}</a>`;
    return `<span class="f-item">${link}<button class="f-detach" data-detach="${f.id}" title="Открепить файл">✕</button></span>`;
  }).join('')}</div>`;
}

const AI_STATUS_LABELS = {
  pending: 'ИИ: в очереди',
  processing: 'ИИ: проверяет…',
  done: 'ИИ: проверено',
  skipped: 'ИИ: пропущено',
  error: 'ИИ: ошибка',
  reverted: 'ИИ: возвращён оригинал',
};

const AI_STATUS_ICONS = {
  pending: 'clock',
  processing: 'loader',
  done: 'circle-check',
  skipped: 'skip-forward',
  error: 'circle-alert',
  reverted: 'undo',
};

function aiBadge(e) {
  if (!e || !e.ai_status) return '';
  const st = e.ai_status;
  const label = AI_STATUS_LABELS[st] || `ИИ: ${st}`;
  const icon = AI_STATUS_ICONS[st] || 'sparkles';
  return `<span class="ai-badge ai-badge-ic ai-badge-${esc(st)}" data-ai-badge="${e.id}" title="${esc(label)}" role="img" aria-label="${esc(label)}"><i data-lucide="${icon}"></i></span>`;
}

function findFile(id) {
  for (const e of currentEntries) {
    const f = (e.files || []).find(x => x.id === id);
    if (f) return f;
  }
  return null;
}

async function detachFile(id) {
  const f = findFile(id);
  if (!f) return;
  if (!confirm(`Открепить файл «${f.name}» от записи? Он переместится в «Файлы → Откреплённые».`)) return;
  const res = await fetch(`${API}/api/files/${id}/detach`, { method: 'POST', headers: hdr() });
  if (res.ok) {
    showToast('Файл откреплён');
    if (f.entry_id) refreshEntryCard(f.entry_id);
    else loadEntries();
  } else {
    const err = await res.json().catch(() => ({}));
    alert(err.error || 'Ошибка');
  }
}

function gridEntryHTML(e) {
  const mp = mainPhotoPath(e);
  return `
    <div class="card${highlightNewIds.has(e.id) ? ' entry-appear' : ' entry-enter'}">
      ${mp ? `<img src="${thumbSrc(mp)}" data-img="${API}${mp}" loading="lazy" decoding="async" alt="">` : ''}
        <div class="info">
        <div class="name">${esc(e.student_name)}</div>
        <div class="group">${esc(e.group_name)}</div>
        <div class="desc">${esc(e.description)}${aiBadge(e)}</div>
        ${filesHTML(e.files)}
        <div class="time">${new Date(e.created_at).toLocaleString('ru')}</div>
      </div>
      <button class="edit" data-edit="${e.id}" title="Редактировать">✎</button>
      ${mp ? `<button class="edit" data-enhance="${e.id}" title="Улучшить фото">✦</button>` : ''}
      <button class="del" data-del="${e.id}" title="Удалить">&times;</button>
    </div>
  `;
}

function cardEntryHTML(e) {
  const mp = mainPhotoPath(e);
  return `
    <div class="journal-card${highlightNewIds.has(e.id) ? ' entry-appear' : ' entry-enter'}">
      ${mp
        ? `<img src="${thumbSrc(mp)}" data-img="${API}${mp}" loading="lazy" decoding="async" alt="">`
        : `<div class="no-photo"><svg viewBox="0 0 240 160" preserveAspectRatio="xMidYMid meet" aria-hidden="true"><circle cx="105" cy="48" r="15"/><path d="M74 140 C74 106 88 92 105 92 C122 92 136 106 136 140 Z"/><circle cx="145" cy="58" r="18"/><path d="M108 144 C108 104 124 88 145 88 C166 88 182 104 182 144 Z"/></svg></div>`}
      ${e.group_name ? `<span class="group-badge" title="${esc(e.group_name)}">${esc(e.group_name)}</span>` : ''}
      <div class="body">
        <div class="name">${esc(e.student_name)}</div>
        <div class="desc">${esc(e.description)}${aiBadge(e)}</div>
        ${filesHTML(e.files)}
      </div>
      <div class="foot">
        <span>${new Date(e.created_at).toLocaleString('ru')}</span>
        <span>
          <button class="edit" data-edit="${e.id}" title="Редактировать">✎</button>
          ${mp ? `<button class="edit" data-enhance="${e.id}" title="Улучшить фото">✦</button>` : ''}
          <button class="del" data-del="${e.id}" title="Удалить">&times;</button>
        </span>
      </div>
    </div>
  `;
}

function renderGrid() {
  const grid = document.getElementById('grid');
  if (!currentEntries.length) {
    const fmt = d => d ? d.split('-').reverse().join('.') : '';
    const from = fmt(document.getElementById('dateFrom').value);
    const to = fmt(document.getElementById('dateTo').value);
    let range = '';
    if (from && to) range = ` за ${from} – ${to}`;
    else if (from) range = ` с ${from}`;
    else if (to) range = ` по ${to}`;
    grid.className = 'grid';
    grid.innerHTML = `<div class="empty">Ничего не найдено${range}</div>`;
    return;
  }
  if (view === 'cards') {
    grid.className = 'journal-cards';
    grid.innerHTML = currentEntries.map(cardEntryHTML).join('');
  } else {
    grid.className = 'grid';
    grid.innerHTML = currentEntries.map(gridEntryHTML).join('');
  }
  const items = Array.from(grid.children);
  items.forEach((el, i) => {
    el.style.animationDelay = `${Math.min(i * 45, 500)}ms`;
  });
  renderIcons();
}

function refreshEntryCardDom(e) {
  const btn = document.querySelector(`[data-edit="${e.id}"]`);
  const card = btn ? btn.closest('.card, .journal-card') : null;
  if (!card) return;
  const tmp = document.createElement('div');
  tmp.innerHTML = (view === 'cards' ? cardEntryHTML(e) : gridEntryHTML(e)).trim();
  const fresh = tmp.firstElementChild;
  fresh.classList.remove('entry-enter', 'entry-appear');
  fresh.style.animationDelay = '';
  card.replaceWith(fresh);
  renderIcons();
}

async function refreshEntryCard(id) {
  const res = await fetch(`${API}/api/entries/${id}`, { headers: hdr() });
  if (!res.ok) return false;
  const e = await res.json();
  const idx = currentEntries.findIndex(x => x.id === e.id);
  if (idx !== -1) currentEntries[idx] = e;
  refreshEntryCardDom(e);
  return true;
}

function setView(v) {
  view = v === 'cards' ? 'cards' : 'list';
  localStorage.setItem('journalView', view);
  document.querySelectorAll('#viewToggle button').forEach(b => {
    b.classList.toggle('active', b.dataset.view === view);
  });
  renderGrid();
}

function setDefaultDates() {
  const today = new Date().toISOString().slice(0, 10);
  document.getElementById('dateFrom').value = today;
  document.getElementById('dateTo').value = today;
}

async function loadGroupOptions() {
  if (groupsLoaded) return;
  const sel = document.getElementById('groupFilter');
  while (sel.options.length > 1) sel.remove(1);
  const res = await fetch(`${API}/api/groups`, { headers: hdr() });
  const groups = await res.json();
  groups.forEach(g => {
    const o = document.createElement('option');
    o.value = g.id; o.textContent = g.name;
    sel.appendChild(o);
  });
  groupsLoaded = true;
}

async function loadStudentOptions() {
  if (studentsLoaded) return;
  const dl = document.getElementById('studentFilterList');
  const res = await fetch(`${API}/api/students/names`, { headers: hdr() });
  const names = await res.json();
  dl.innerHTML = names.map(n => `<option value="${esc(n)}">`).join('');
  studentsLoaded = true;
}

async function loadEntries() {
  const p = new URLSearchParams();
  const q = document.getElementById('searchInput').value;
  const sn = document.getElementById('studentFilter').value;
  const gid = document.getElementById('groupFilter').value;
  const df = document.getElementById('dateFrom').value;
  const dt = document.getElementById('dateTo').value;
  if (q) p.set('search', q);
  if (sn) p.set('student_name', sn);
  if (gid) p.set('group_id', gid);
  if (df) p.set('date_from', df);
  if (dt) p.set('date_to', dt);
  p.set('limit', PAGE_SIZE);
  p.set('offset', (page - 1) * PAGE_SIZE);
  const res = await fetch(`${API}/api/entries?${p}`, { headers: hdr() });
  const data = await res.json();
  const firstLoad = seenEntryIds.size === 0;
  const newIds = firstLoad ? [] : data.entries.filter(e => !seenEntryIds.has(e.id)).map(e => e.id);
  if (newIds.length) {
    highlightNewIds = new Set([...highlightNewIds, ...newIds]);
    if (highlightClearTimer) clearTimeout(highlightClearTimer);
    highlightClearTimer = setTimeout(() => { highlightNewIds = new Set(); }, 8000);
  }
  data.entries.forEach(e => seenEntryIds.add(e.id));
  currentEntries = data.entries;
  totalEntries = data.total;
  renderGrid();
  renderPager(document.getElementById('pager'), page, Math.max(1, Math.ceil(totalEntries / PAGE_SIZE)), goPage);
}

function goPage(p) {
  page = p;
  loadEntries();
}

let liveSource = null;
let liveReconnectTimer = null;
let entriesRefreshTimer = null;
function applyAiUpdate(update) {
  const e = currentEntries.find(x => x.id === update.id);
  if (!e) return;
  e.ai_status = update.ai_status;
  e.ai_error = update.ai_error || null;
  if (update.description !== null && update.description !== undefined) e.description = update.description;
  if (update.description_ai !== null && update.description_ai !== undefined) e.description_ai = update.description_ai;
  if (update.description_original !== null && update.description_original !== undefined) e.description_original = update.description_original;
  if (update.ai_status === 'done' || update.ai_status === 'reverted') e.ai_checked_at = new Date().toISOString();
  document.querySelectorAll(`[data-ai-badge="${update.id}"]`).forEach(badgeEl => {
    const desc = badgeEl.closest('.desc');
    if (desc && update.description !== null && update.description !== undefined) {
      desc.textContent = e.description;
      desc.insertAdjacentHTML('beforeend', aiBadge(e));
    } else {
      badgeEl.outerHTML = aiBadge(e);
    }
  });
  renderIcons();
  const editBadge = document.getElementById('editAiStatus');
  if (editId === update.id && editBadge && editBadge.style.display !== 'none') {
    renderEditAiStatus(e);
  }
  if (editId === update.id) {
    const ta = document.getElementById('editDesc');
    if (ta && document.activeElement !== ta && update.description !== null && update.description !== undefined) {
      ta.value = e.description;
    }
  }
}
function connectLiveUpdates() {
  if (liveSource) { liveSource.close(); liveSource = null; }
  const connect = () => {
    const t = sessionStorage.getItem('authToken');
    if (!t) return;
    liveSource = new EventSource(`${API}/api/events?token=${encodeURIComponent(t)}`);
    liveSource.addEventListener('entries_changed', () => {
      if (entriesRefreshTimer) return;
      entriesRefreshTimer = setTimeout(() => {
        entriesRefreshTimer = null;
        showToast('Поступила новая запись — список обновлён');
        page = 1;
        loadEntries();
      }, 300);
    });
    liveSource.addEventListener('ai_status', ev => {
      try { applyAiUpdate(JSON.parse(ev.data)); } catch (err) {}
    });
    liveSource.onerror = () => {
      if (liveSource) { liveSource.close(); liveSource = null; }
      if (liveReconnectTimer) clearTimeout(liveReconnectTimer);
      liveReconnectTimer = setTimeout(connect, 5000);
    };
  };
  connect();
  window.addEventListener('beforeunload', () => { if (liveSource) liveSource.close(); });
}

async function openEdit(id) {
  const e = currentEntries.find(x => x.id === id);
  if (!e) return;
  editId = id;
  editDeletePhoto = false;
  fillAutocomplete();
  document.getElementById('editName').value = e.student_name;
  document.getElementById('editDesc').value = e.description;
  renderEditAiStatus(e);
  const sel = document.getElementById('editGroup');
  if (!editGroups.length) {
    const res = await fetch(`${API}/api/groups`, { headers: hdr() });
    editGroups = await res.json();
    sel.innerHTML = editGroups.map(g => `<option value="${g.id}">${esc(g.name)}</option>`).join('');
  }
  sel.value = e.group_id;
  renderEditPhotos(e.photos || [], e.photo_path);
  document.getElementById('editModal').classList.add('open');
}

function renderEditPhotos(photos, mainPath) {
  const preview = document.getElementById('editPhotoPreview');
  preview.innerHTML = '';
  if (!photos.length) return;
  photos.forEach((p) => {
    const isMain = p.photo_path === mainPath;
    const div = document.createElement('div');
    div.className = 'file-preview-item';
    div.style.cssText = 'display:flex;align-items:center;gap:8px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);border-radius:6px;font-size:.8rem';
    div.dataset.photoId = p.id;
    const applyStyle = isMain
      ? 'background:#16a34a;border:none;color:#fff;border-radius:6px;padding:4px 10px;font-size:.75rem;cursor:default;white-space:nowrap'
      : 'background:var(--card);border:1px solid var(--border);color:var(--text);border-radius:6px;padding:4px 10px;font-size:.75rem;cursor:pointer;white-space:nowrap';
    div.innerHTML = `<img src="${thumbSrc(p.photo_path)}" style="width:48px;height:48px;object-fit:cover;border-radius:4px"> <span style="flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap">${esc(p.photo_path.split('/').pop())}</span> <button type="button" class="apply-photo-btn" style="${applyStyle}" title="${isMain ? 'Главное фото записи' : 'Сделать главным фото записи'}" ${isMain ? 'disabled' : ''}>${isMain ? 'Применено ✓' : 'Применить'}</button> <button type="button" class="delete-entry-photo" style="background:none;border:none;color:#ef4444;cursor:pointer;font-size:1.1rem;line-height:1" title="Удалить фото">✕</button>`;
    preview.appendChild(div);
    const thumb = div.querySelector('img');
    const showMissing = () => {
      const ph = document.createElement('span');
      ph.textContent = 'нет файла';
      ph.style.cssText = 'width:48px;height:48px;display:flex;align-items:center;justify-content:center;background:var(--bg);border:1px dashed var(--border);border-radius:4px;font-size:.6rem;color:var(--muted);text-align:center;line-height:1.1;flex:0 0 auto';
      thumb.replaceWith(ph);
    };
    thumb.addEventListener('error', showMissing);
    if (thumb.complete && thumb.naturalWidth === 0) showMissing();
    div.querySelector('.delete-entry-photo').addEventListener('click', async () => {
      if (!confirm('Удалить это фото?')) return;
      const res = await fetch(`${API}/api/entries/${editId}/photos/${p.id}`, { method: 'DELETE', headers: hdr() });
      if (res.ok) {
        div.remove();
        showToast('Фото удалено');
        refreshEntryCard(editId);
      } else {
        alert('Ошибка удаления');
      }
    });
  });
}

async function applyMainPhoto(btn) {
  const div = btn.closest('.file-preview-item');
  const photoId = div?.dataset.photoId;
  if (!photoId) return;
  btn.disabled = true;
  const res = await fetch(`${API}/api/entries/${editId}/photos/${photoId}/main`, { method: 'PUT', headers: hdr() });
  if (!res.ok) {
    btn.disabled = false;
    const err = await res.json().catch(() => ({}));
    alert(err.error || 'Ошибка');
    return;
  }
  document.querySelectorAll('#editPhotoPreview .apply-photo-btn').forEach(b => {
    b.disabled = false;
    b.textContent = 'Применить';
    b.title = 'Сделать главным фото записи';
    b.style.background = 'var(--card)';
    b.style.color = 'var(--text)';
  });
  btn.disabled = true;
  btn.textContent = 'Применено ✓';
  btn.title = 'Главное фото записи';
  btn.style.background = '#16a34a';
  btn.style.color = '#fff';
  showToast('Главное фото обновлено');
  refreshEntryCard(editId);
}

function closeEdit() {
  document.getElementById('editModal').classList.remove('open');
  document.getElementById('editFiles').value = '';
  document.getElementById('editFilesPreview').innerHTML = '';
  document.getElementById('editPhoto').value = '';
  document.getElementById('editPhotoPreview').innerHTML = '';
  document.getElementById('editAiStatus').style.display = 'none';
  editId = null;
  editDeletePhoto = false;
}

let enhanceEntryId = null;
let enhanceSourceImg = null;
let enhanceTimer = null;
let enhanceSaving = false;
let enhanceEngine = 'auto';
let enhanceEngineLoaded = false;

async function loadEnhanceEngine() {
  if (enhanceEngineLoaded) return;
  enhanceEngineLoaded = true;
  try {
    const r = await fetch(`${API}/api/public-settings`);
    const f = await r.json();
    if (['auto', 'server', 'client'].includes(f.photo_enhance_engine)) enhanceEngine = f.photo_enhance_engine;
  } catch (e) {}
}

function openEnhance(id) {
  const e = currentEntries.find(x => x.id === id);
  if (!e) return;
  const mp = mainPhotoPath(e);
  if (!mp) { showToast('У записи нет фото'); return; }
  enhanceEntryId = id;
  enhanceSourceImg = null;
  ['Brightness', 'Contrast', 'Saturate'].forEach(k => {
    const el = document.getElementById('enhance' + k);
    el.value = 100;
    document.getElementById('enhance' + k + 'Val').textContent = '100%';
  });
  const sharp = document.getElementById('enhanceSharp');
  sharp.value = 0;
  document.getElementById('enhanceSharpVal').textContent = '0%';
  const orig = document.getElementById('enhanceOrig');
  orig.src = `${API}${mp}`;
  const canvas = document.getElementById('enhanceCanvas');
  canvas.style.display = 'none';
  const loading = document.getElementById('enhanceLoading');
  loading.style.display = '';
  loading.textContent = 'Загрузка...';
  const img = new Image();
  img.onload = () => {
    enhanceSourceImg = img;
    renderEnhancePreview();
  };
  img.onerror = () => {
    loading.textContent = 'Не удалось загрузить фото';
  };
  img.src = `${API}${mp}`;
  document.getElementById('enhanceModal').classList.add('open');
}

function closeEnhance() {
  document.getElementById('enhanceModal').classList.remove('open');
  enhanceEntryId = null;
  enhanceSourceImg = null;
}

function medianFilterPass(ctx, w, h) {
  const data = ctx.getImageData(0, 0, w, h);
  const src = data.data;
  const out = new Uint8ClampedArray(src);
  const row = w * 4;
  const win = new Array(9);
  for (let y = 1; y < h - 1; y++) {
    for (let x = 1; x < w - 1; x++) {
      const i = y * row + x * 4;
      for (let ch = 0; ch < 3; ch++) {
        win[0] = src[i - row - 4 + ch]; win[1] = src[i - row + ch]; win[2] = src[i - row + 4 + ch];
        win[3] = src[i - 4 + ch]; win[4] = src[i + ch]; win[5] = src[i + 4 + ch];
        win[6] = src[i + row - 4 + ch]; win[7] = src[i + row + ch]; win[8] = src[i + row + 4 + ch];
        win.sort((a, b) => a - b);
        out[i + ch] = win[4];
      }
    }
  }
  data.data.set(out);
  ctx.putImageData(data, 0, 0);
}

function sharpenPass(ctx, w, h, sharp) {
  const data = ctx.getImageData(0, 0, w, h);
  const src = data.data;
  const out = new Uint8ClampedArray(src);
  const row = w * 4;
  const a = (sharp / 100) * 1.5;
  for (let y = 1; y < h - 1; y++) {
    for (let x = 1; x < w - 1; x++) {
      const i = y * row + x * 4;
      for (let ch = 0; ch < 3; ch++) {
        const v = (1 + 4 * a) * src[i + ch]
          - a * src[i - 4 + ch] - a * src[i + 4 + ch]
          - a * src[i - row + ch] - a * src[i + row + ch];
        out[i + ch] = v;
      }
    }
  }
  data.data.set(out);
  ctx.putImageData(data, 0, 0);
}

function drawEnhanced(ctx, img, w, h) {
  const b = document.getElementById('enhanceBrightness').value;
  const c = document.getElementById('enhanceContrast').value;
  const s = document.getElementById('enhanceSaturate').value;
  const dn = parseInt(document.getElementById('enhanceDenoise').value, 10);
  const sp = parseInt(document.getElementById('enhanceSharp').value, 10);
  ctx.filter = `brightness(${b}%) contrast(${c}%) saturate(${s}%)`;
  ctx.drawImage(img, 0, 0, w, h);
  ctx.filter = 'none';
  if (dn > 0) {
    medianFilterPass(ctx, w, h);
    if (dn > 70) medianFilterPass(ctx, w, h);
  }
  if (sp > 0) sharpenPass(ctx, w, h, sp);
}

function renderEnhancePreview() {
  if (!enhanceSourceImg) return;
  const img = enhanceSourceImg;
  const scale = Math.min(1, 1600 / img.naturalWidth);
  const w = Math.max(1, Math.round(img.naturalWidth * scale));
  const h = Math.max(1, Math.round(img.naturalHeight * scale));
  const canvas = document.getElementById('enhanceCanvas');
  canvas.width = w;
  canvas.height = h;
  const ctx = canvas.getContext('2d');
  drawEnhanced(ctx, img, w, h);
  canvas.style.display = 'block';
  document.getElementById('enhanceLoading').style.display = 'none';
}

function scheduleEnhancePreview() {
  document.getElementById('enhanceBrightnessVal').textContent = document.getElementById('enhanceBrightness').value + '%';
  document.getElementById('enhanceContrastVal').textContent = document.getElementById('enhanceContrast').value + '%';
  document.getElementById('enhanceSaturateVal').textContent = document.getElementById('enhanceSaturate').value + '%';
  document.getElementById('enhanceDenoiseVal').textContent = document.getElementById('enhanceDenoise').value + '%';
  document.getElementById('enhanceSharpVal').textContent = document.getElementById('enhanceSharp').value + '%';
  if (enhanceTimer) clearTimeout(enhanceTimer);
  enhanceTimer = setTimeout(renderEnhancePreview, 120);
}

function enhanceParams() {
  return {
    brightness: parseInt(document.getElementById('enhanceBrightness').value, 10),
    contrast: parseInt(document.getElementById('enhanceContrast').value, 10),
    saturate: parseInt(document.getElementById('enhanceSaturate').value, 10),
    denoise: parseInt(document.getElementById('enhanceDenoise').value, 10),
    sharp: parseInt(document.getElementById('enhanceSharp').value, 10),
  };
}

function estimateNoise(img) {
  const aw = 160;
  const ah = Math.max(1, Math.round(img.naturalHeight * aw / img.naturalWidth));
  const ac = document.createElement('canvas');
  ac.width = aw;
  ac.height = ah;
  const actx = ac.getContext('2d');
  actx.drawImage(img, 0, 0, aw, ah);
  const d = actx.getImageData(0, 0, aw, ah).data;
  let sum = 0;
  let n = 0;
  for (let y = 0; y < ah - 1; y++) {
    for (let x = 0; x < aw - 1; x++) {
      const i = (y * aw + x) * 4;
      const l = 0.299 * d[i] + 0.587 * d[i + 1] + 0.114 * d[i + 2];
      const lr = 0.299 * d[i + 4] + 0.587 * d[i + 5] + 0.114 * d[i + 6];
      const lb = 0.299 * d[i + aw * 4] + 0.587 * d[i + aw * 4 + 1] + 0.114 * d[i + aw * 4 + 2];
      sum += Math.abs(l - lr) + Math.abs(l - lb);
      n += 2;
    }
  }
  return n ? sum / n : 0;
}

function autoEnhance() {
  if (!enhanceSourceImg) return;
  const img = enhanceSourceImg;
  const aw = 160;
  const ah = Math.max(1, Math.round(img.naturalHeight * aw / img.naturalWidth));
  const ac = document.createElement('canvas');
  ac.width = aw;
  ac.height = ah;
  const actx = ac.getContext('2d');
  actx.drawImage(img, 0, 0, aw, ah);
  const d = actx.getImageData(0, 0, aw, ah).data;
  const hist = new Array(256).fill(0);
  let total = 0;
  for (let i = 0; i < d.length; i += 4) {
    if (d[i + 3] < 16) continue;
    hist[Math.round(0.299 * d[i] + 0.587 * d[i + 1] + 0.114 * d[i + 2])]++;
    total++;
  }
  const pct = p => {
    let acc = 0;
    const target = total * p;
    for (let v = 0; v < 256; v++) {
      acc += hist[v];
      if (acc >= target) return v;
    }
    return 255;
  };
  let lo = pct(0.005);
  let hi = pct(0.995);
  if (hi - lo < 30) {
    lo = Math.max(0, lo - 15);
    hi = Math.min(255, hi + 15);
  }
  const contrast = Math.round(Math.min(150, Math.max(100, 25500 / (hi - lo))));
  const brightness = Math.round(Math.min(120, Math.max(85, 12800 / Math.max(1, (lo + hi) / 2))));
  const noise = estimateNoise(img);
  let denoise = 0;
  let sharp = 30;
  if (noise > 6) {
    denoise = Math.min(50, Math.round(noise * 6));
    sharp = 15;
  }
  const saturate = 106;
  document.getElementById('enhanceBrightness').value = brightness;
  document.getElementById('enhanceContrast').value = contrast;
  document.getElementById('enhanceSaturate').value = saturate;
  document.getElementById('enhanceDenoise').value = denoise;
  document.getElementById('enhanceSharp').value = sharp;
  scheduleEnhancePreview();
}

async function saveEnhance() {
  if (!enhanceEntryId || !enhanceSourceImg || enhanceSaving) return;
  await loadEnhanceEngine();
  const btn = document.getElementById('enhanceSaveBtn');
  enhanceSaving = true;
  btn.disabled = true;
  btn.textContent = 'Сохранение...';
  const entryId = enhanceEntryId;
  try {
    let done = false;
    let engineLabel = 'клиент';
    if (enhanceEngine !== 'client') {
      try {
        const ctrl = new AbortController();
        const timer = setTimeout(() => ctrl.abort(), 8000);
        const res = await fetch(`${API}/api/entries/${entryId}/photo/enhance`, {
          method: 'PUT',
          headers: hdrJson(),
          body: JSON.stringify({ params: enhanceParams() }),
          signal: ctrl.signal,
        });
        clearTimeout(timer);
        if (!res.ok) {
          const err = await res.json().catch(() => ({}));
          throw new Error(err.error || 'Ошибка сервера');
        }
        engineLabel = 'сервер';
        done = true;
      } catch (e) {
        if (enhanceEngine === 'server') throw e;
      }
    }
    if (!done) {
      const img = enhanceSourceImg;
      const canvas = document.createElement('canvas');
      canvas.width = img.naturalWidth;
      canvas.height = img.naturalHeight;
      const ctx = canvas.getContext('2d');
      drawEnhanced(ctx, img, canvas.width, canvas.height);
      const blob = await new Promise((resolve, reject) => canvas.toBlob(b => b ? resolve(b) : reject(new Error('toBlob failed')), 'image/jpeg', 0.92));
      const fd = new FormData();
      fd.append('photo', blob, 'enhanced.jpg');
      const res = await fetch(`${API}/api/entries/${entryId}/photo/enhance`, { method: 'PUT', headers: hdr(), body: fd });
      if (!res.ok) {
        const err = await res.json().catch(() => ({}));
        throw new Error(err.error || 'Ошибка сохранения');
      }
    }
    showToast(`Фото улучшено (${engineLabel}) и сохранено`);
    closeEnhance();
    refreshEntryCard(entryId);
  } catch (e) {
    alert(e.message);
  } finally {
    enhanceSaving = false;
    btn.disabled = false;
    btn.textContent = 'Применить';
  }
}

async function aiCorrect() {
  if (aiCorrecting) return;
  const textarea = document.getElementById('editDesc');
  const text = textarea.value.trim();
  if (!text) { showToast('Нет текста для исправления'); return; }
  const btn = document.getElementById('aiCorrectBtn');
  const modal = document.getElementById('aiCorrectModal');
  const suggestionEl = document.getElementById('aiSuggestion');
  aiCorrecting = true;
  btn.disabled = true;
  btn.textContent = '⏳';
  suggestionEl.textContent = 'Обработка...';
  modal.classList.add('open');
  try {
    const res = await fetch(`${API}/api/ai/correct`, {
      method: 'POST',
      headers: hdrJson(),
      body: JSON.stringify({ text })
    });
    if (!res.ok) {
      const err = await res.json();
      throw new Error(err.error || 'Ошибка ИИ');
    }
    const data = await res.json();
    suggestionEl.textContent = data.suggestion || text;
  } catch (e) {
    suggestionEl.textContent = 'Ошибка: ' + e.message;
    showToast('ИИ недоступен: ' + e.message);
  } finally {
    aiCorrecting = false;
    btn.disabled = false;
    btn.textContent = '✨';
  }
}

function closeAiCorrect() {
  document.getElementById('aiCorrectModal').classList.remove('open');
}

function acceptAiCorrect() {
  const suggestion = document.getElementById('aiSuggestion').textContent;
  if (suggestion && suggestion !== 'Обработка...' && !suggestion.startsWith('Ошибка:')) {
    document.getElementById('editDesc').value = suggestion;
  }
  closeAiCorrect();
}

function renderEditAiStatus(e) {
  const el = document.getElementById('editAiStatus');
  if (!e || !e.ai_status) { el.style.display = 'none'; el.innerHTML = ''; return; }
  el.style.display = 'block';
  const changed = e.description_ai && e.description_original && e.description_ai !== e.description_original;
  const parts = [AI_STATUS_LABELS[e.ai_status] || `ИИ: ${e.ai_status}`];
  if (e.ai_checked_at) parts.push(new Date(e.ai_checked_at).toLocaleString('ru'));
  let html = `<span>${esc(parts.join(' · '))}</span>`;
  if (changed) html += ` <button type="button" id="aiRevertBtn" class="ai-btn" style="font-size:.75rem" title="Вернуть исходный текст (до ИИ)">↩ Оригинал</button>`;
  html += ` <button type="button" id="aiRecheckBtn" class="ai-btn" style="font-size:.75rem" title="Проверить заново">⟳ Проверить</button>`;
  el.innerHTML = html;
  const rb = document.getElementById('aiRevertBtn');
  if (rb) rb.addEventListener('click', () => revertAi(e.id));
  const cb = document.getElementById('aiRecheckBtn');
  if (cb) cb.addEventListener('click', () => recheckAi(e.id));
}

async function revertAi(id) {
  if (!confirm('Вернуть исходный текст записи (до ИИ-проверки)?')) return;
  const res = await fetch(`${API}/api/entries/${id}/ai/revert`, { method: 'POST', headers: hdr() });
  if (!res.ok) { const err = await res.json().catch(() => ({})); alert(err.error || 'Ошибка'); return; }
  const e = currentEntries.find(x => x.id === id);
  if (e) {
    if (e.description_original) e.description = e.description_original;
    e.description_ai = null;
    e.ai_status = 'reverted';
    e.ai_error = null;
  }
  showToast('Оригинал восстановлен');
  closeEdit();
  refreshEntryCard(id);
}

async function recheckAi(id) {
  const res = await fetch(`${API}/api/entries/${id}/ai/recheck`, { method: 'POST', headers: hdr() });
  if (!res.ok) { const err = await res.json().catch(() => ({})); alert(err.error || 'Ошибка'); return; }
  const e = currentEntries.find(x => x.id === id);
  if (e) {
    e.ai_status = 'pending';
    e.ai_error = null;
  }
  showToast('Отправлено на ИИ-проверку');
  closeEdit();
  refreshEntryCard(id);
}

async function saveEdit() {
  if (!editId) return;
  const name = document.getElementById('editName').value.trim();
  const group_id = document.getElementById('editGroup').value;
  const description = document.getElementById('editDesc').value.trim();
  if (!name || !group_id || !description) { alert('Заполните все поля'); return; }

  const formData = new FormData();
  formData.append('student_name', name);
  formData.append('group_id', group_id);
  formData.append('description', description);

  const photoFiles = document.getElementById('editPhoto').files;
  for (const f of photoFiles) formData.append('photo', f);

  const res = await fetch(`${API}/api/entries/${editId}`, {
    method: 'PUT',
    headers: hdr(),
    body: formData
  });
  if (!res.ok) { const err = await res.json(); alert(err.error); return; }

  const files = document.getElementById('editFiles').files;
  if (files.length) {
    const filesFormData = new FormData();
    for (const f of files) filesFormData.append('files', f);
    const uploadRes = await fetch(`${API}/api/entries/${editId}/files`, {
      method: 'POST',
      headers: hdr(),
      body: filesFormData
    });
    if (!uploadRes.ok) {
      const err = await uploadRes.json().catch(() => ({}));
      alert(err.error || 'Ошибка загрузки файлов');
      return;
    }
  }

  const id = editId;
  closeEdit();
  const refreshed = await refreshEntryCard(id);
  if (!refreshed) loadEntries();
  showToast('Запись обновлена');
}

async function delEntry(id) {
  if (!confirm('Переместить запись в корзину? Файлы и фото сохранятся.')) return;
  await fetch(`${API}/api/entries/${id}`, { method: 'DELETE', headers: hdr() });
  showToast('Запись перемещена в корзину');
  loadEntries();
}

document.getElementById('studentFilter').addEventListener('change', () => { page = 1; loadEntries(); });
document.getElementById('groupFilter').addEventListener('change', () => { page = 1; loadEntries(); });
document.getElementById('dateFrom').addEventListener('change', () => { page = 1; loadEntries(); });
document.getElementById('dateTo').addEventListener('change', () => { page = 1; loadEntries(); });
document.getElementById('searchInput').addEventListener('input', () => {
  clearTimeout(searchTimer);
  searchTimer = setTimeout(() => { page = 1; loadEntries(); }, 300);
});
document.getElementById('editForm').addEventListener('submit', (e) => {
  e.preventDefault();
  saveEdit();
});
document.getElementById('editFiles').addEventListener('change', (e) => {
  const preview = document.getElementById('editFilesPreview');
  preview.innerHTML = '';
  Array.from(e.target.files).forEach((f, i) => {
    const div = document.createElement('div');
    div.className = 'file-preview-item';
    div.style.cssText = 'display:flex;align-items:center;gap:8px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);border-radius:6px;font-size:.8rem';
    div.innerHTML = `<span>${esc(f.name)}</span> <span style="color:var(--muted)">${(f.size/1024).toFixed(1)} KB</span> <button type="button" data-remove-file="${i}" style="background:none;border:none;color:var(--muted);cursor:pointer;font-size:1.1rem;line-height:1">✕</button>`;
    preview.appendChild(div);
  });
});

document.getElementById('editPhoto').addEventListener('change', (e) => {
  const preview = document.getElementById('editPhotoPreview');
  Array.from(e.target.files).forEach(f => {
    const div = document.createElement('div');
    div.className = 'file-preview-item';
    div.style.cssText = 'display:flex;align-items:center;gap:8px;padding:6px 8px;background:var(--bg);border:1px solid var(--border);border-radius:6px;font-size:.8rem';
    const url = URL.createObjectURL(f);
    div.innerHTML = `<img src="${url}" style="width:48px;height:48px;object-fit:cover;border-radius:4px"> <span>${esc(f.name)}</span> <span style="color:var(--muted)">${(f.size/1024).toFixed(1)} KB</span> <button type="button" data-remove-new-photo="${f.name}" style="background:none;border:none;color:var(--muted);cursor:pointer;font-size:1.1rem;line-height:1">✕</button>`;
    preview.appendChild(div);
  });
});

function removeEditFile(index) {
  const input = document.getElementById('editFiles');
  const dt = new DataTransfer();
  Array.from(input.files).forEach((f, i) => { if (i !== index) dt.items.add(f); });
  input.files = dt.files;
  input.dispatchEvent(new Event('change'));
}

async function exportCSV() {
  const p = new URLSearchParams();
  const q = document.getElementById('searchInput').value;
  const sn = document.getElementById('studentFilter').value;
  const gid = document.getElementById('groupFilter').value;
  const df = document.getElementById('dateFrom').value;
  const dt = document.getElementById('dateTo').value;
  if (q) p.set('search', q);
  if (sn) p.set('student_name', sn);
  if (gid) p.set('group_id', gid);
  if (df) p.set('date_from', df);
  if (dt) p.set('date_to', dt);
  const res = await fetch(`${API}/api/entries?${p}`, { headers: hdr() });
  const entries = (await res.json()).entries;
  if (!entries.length) { alert('Нет данных для экспорта'); return; }
  const rows = [['Фамилия и имя', 'Группа', 'Описание', 'Дата', 'Фото']];
  entries.forEach(e => {
    rows.push([
      e.student_name,
      e.group_name,
      e.description.replace(/\n/g, ' '),
      new Date(e.created_at).toLocaleString('ru'),
      e.photo_path ? `${API}${e.photo_path}` : ''
    ]);
  });
  const csv = rows.map(r => r.map(c => `"${String(c).replace(/"/g, '""')}"`).join(';')).join('\n');
  const bom = '\uFEFF';
  const blob = new Blob([bom + csv], { type: 'text/csv;charset=utf-8' });
  const url = URL.createObjectURL(blob);
  const a = document.createElement('a');
  a.href = url;
  const dateLabel = df && dt ? `${df}_${dt}` : 'all';
  a.download = `journal_${dateLabel}.csv`;
  a.click();
  URL.revokeObjectURL(url);
}

let linkGroups = [];
let linkStudentsLoaded = false;
let createdLinkUrl = '';

function fmtD(d) { return d ? d.split('-').reverse().join('.') : 'весь период'; }

async function openLinkCreate() {
  const gid = document.getElementById('groupFilter').value;
  if (!gid) { alert('Сначала выберите группу в фильтре'); return; }
  const df = document.getElementById('dateFrom').value;
  const dt = document.getElementById('dateTo').value;
  if (!linkGroups.length) {
    const res = await fetch(`${API}/api/groups`, { headers: hdr() });
    linkGroups = await res.json();
  }
  if (!linkStudentsLoaded) {
    const res = await fetch(`${API}/api/students/names`, { headers: hdr() });
    const names = await res.json();
    const dl = document.getElementById('linkStudentList');
    dl.innerHTML = names.map(n => `<option value="${esc(n)}">`).join('');
    linkStudentsLoaded = true;
  }
  const currentStudent = document.getElementById('studentFilter').value;
  const g = linkGroups.find(x => String(x.id) === String(gid));
  document.getElementById('linkPreview').innerHTML =
    `Будут показаны записи: <b>${esc(g ? g.name : '')}</b><br>Период: <b>${fmtD(df)}</b> — <b>${fmtD(dt)}</b>`;
  document.getElementById('linkGroupPreview').value = g ? g.name : '';
  const dfl = df.split('-').reverse().join('.');
  document.getElementById('linkNameInput').value = `${g ? g.name : ''} ${dfl}`;
  document.getElementById('linkStudent').value = currentStudent;
  document.getElementById('linkExpiresDays').value = '7';
  document.getElementById('linkShowNames').checked = false;
  document.getElementById('linkPassword').value = '';
  document.getElementById('linkMessage').value = '';
  document.getElementById('linkUrl').value = '';
  const s = await loadLinkSettings();
  document.getElementById('linkShowNames').checked = s.share_show_student_names !== 'false';
  document.getElementById('linkShowMessage').checked = s.share_show_student_message === 'true';
  document.getElementById('linkShowDate').checked = s.share_show_entry_date === 'true';
  document.getElementById('linkShowPhotos').checked = s.share_show_group_photos !== 'false';
  document.getElementById('linkCreateView').style.display = '';
  document.getElementById('linkResultView').style.display = 'none';
  document.getElementById('linkModal').classList.add('open');
}

function closeLinkCreate() {
  document.getElementById('linkModal').classList.remove('open');
}

async function createLink() {
  const name = document.getElementById('linkNameInput').value.trim();
  const group_id = document.getElementById('groupFilter').value;
  const student_name = document.getElementById('linkStudent').value;
  const date_from = document.getElementById('dateFrom').value;
  const date_to = document.getElementById('dateTo').value;
  const expires_days = parseInt(document.getElementById('linkExpiresDays').value, 10);
  const show_student_names = document.getElementById('linkShowNames').checked;
  const access_password = document.getElementById('linkPassword').value;
  const message = document.getElementById('linkMessage').value.trim();
  const link_url = document.getElementById('linkUrl').value.trim();
  if (!name) { alert('Введите название'); return; }
  if (expires_days < 1 || expires_days > 365) { alert('Дней истечения: 1-365'); return; }
  const expires_at = new Date(Date.now() + expires_days * 24 * 60 * 60 * 1000).toISOString();
  const res = await fetch(`${API}/api/links`, {
    method: 'POST',
    headers: hdrJson(),
    body: JSON.stringify({ name, group_id, student_name: student_name || null, date_from: date_from || null, date_to: date_to || null, show_student_names, expires_at, access_password: access_password || null, message: message || null, link_url: link_url || null, show_student_message: document.getElementById('linkShowMessage').checked, show_entry_date: document.getElementById('linkShowDate').checked, show_group_photos: document.getElementById('linkShowPhotos').checked })
  });
  if (!res.ok) { const err = await res.json(); alert(err.error || 'Ошибка'); return; }
  const link = await res.json();
  createdLinkUrl = `${location.origin}/s/${link.token}`;
  document.getElementById('linkUrlResult').value = createdLinkUrl;
  document.getElementById('linkCreateView').style.display = 'none';
  document.getElementById('linkResultView').style.display = '';
  showToast('Ссылка создана');
}

function copyLink() { copyText(createdLinkUrl); }

document.getElementById('imgModal').addEventListener('click', e => e.currentTarget.classList.remove('open'));
document.getElementById('editModal').addEventListener('click', e => { if (e.target === e.currentTarget) closeEdit(); });
document.getElementById('linkModal').addEventListener('click', e => { if (e.target === e.currentTarget) closeLinkCreate(); });

document.getElementById('grid').addEventListener('click', e => {
  const det = e.target.closest('[data-detach]');
  if (det) { detachFile(parseInt(det.dataset.detach, 10)); return; }
  const ed = e.target.closest('[data-edit]');
  if (ed) { openEdit(parseInt(ed.dataset.edit, 10)); return; }
  const en = e.target.closest('[data-enhance]');
  if (en) { openEnhance(parseInt(en.dataset.enhance, 10)); return; }
  const dl = e.target.closest('[data-del]');
  if (dl) { delEntry(parseInt(dl.dataset.del, 10)); }
});

document.getElementById('editFilesPreview').addEventListener('click', e => {
  const btn = e.target.closest('[data-remove-file]');
  if (btn) removeEditFile(parseInt(btn.dataset.removeFile, 10));
});

document.getElementById('editPhotoPreview').addEventListener('click', e => {
  const removeBtn = e.target.closest('[data-remove-photo]');
  if (removeBtn) {
    document.getElementById('editPhoto').value = '';
    document.getElementById('editPhotoPreview').innerHTML = '';
    return;
  }
  const applyBtn = e.target.closest('.apply-photo-btn');
  if (applyBtn) { applyMainPhoto(applyBtn); return; }
  const removeNewBtn = e.target.closest('[data-remove-new-photo]');
  if (removeNewBtn) {
    const fileName = removeNewBtn.dataset.removeNewPhoto;
    const input = document.getElementById('editPhoto');
    const dt = new DataTransfer();
    Array.from(input.files).forEach(f => { if (f.name !== fileName) dt.items.add(f); });
    input.files = dt.files;
    removeNewBtn.closest('.file-preview-item').remove();
  }
});

document.getElementById('aiCorrectBtn').addEventListener('click', aiCorrect);
document.getElementById('enhanceCancelBtn').addEventListener('click', closeEnhance);
document.getElementById('enhanceAutoBtn').addEventListener('click', autoEnhance);
document.getElementById('enhanceSaveBtn').addEventListener('click', saveEnhance);
document.getElementById('enhanceModal').addEventListener('click', e => { if (e.target === e.currentTarget) closeEnhance(); });
document.getElementById('enhanceBrightness').addEventListener('input', scheduleEnhancePreview);
document.getElementById('enhanceContrast').addEventListener('input', scheduleEnhancePreview);
document.getElementById('enhanceSaturate').addEventListener('input', scheduleEnhancePreview);
document.getElementById('enhanceDenoise').addEventListener('input', scheduleEnhancePreview);
document.getElementById('enhanceSharp').addEventListener('input', scheduleEnhancePreview);
document.getElementById('aiAcceptBtn').addEventListener('click', acceptAiCorrect);
document.getElementById('aiRejectBtn').addEventListener('click', closeAiCorrect);
document.getElementById('aiCorrectModal').addEventListener('click', e => {
  if (e.target === e.currentTarget) closeAiCorrect();
});

document.getElementById('exportCsvBtn').addEventListener('click', exportCSV);
document.getElementById('createLinkBtn').addEventListener('click', openLinkCreate);
document.querySelectorAll('#viewToggle button').forEach(b => b.addEventListener('click', () => setView(b.dataset.view)));
document.getElementById('editCancelBtn').addEventListener('click', closeEdit);
document.getElementById('linkCreateCloseBtn').addEventListener('click', closeLinkCreate);
document.getElementById('linkCreateSaveBtn').addEventListener('click', createLink);
document.getElementById('linkCopyBtn').addEventListener('click', copyLink);

(async () => {
  if (await checkAuth()) {
    buildSidebar(document.body.dataset.page);
    document.querySelectorAll('#viewToggle button').forEach(b => {
      b.classList.toggle('active', b.dataset.view === view);
    });
    setDefaultDates();
    loadGroupOptions();
    loadStudentOptions();
    loadEntries();
    connectLiveUpdates();
  }
})();