let currentEntries = [];
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';

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

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>`;
}

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');
    loadEntries();
  } else {
    const err = await res.json().catch(() => ({}));
    alert(err.error || 'Ошибка');
  }
}

function gridEntryHTML(e) {
  return `
    <div class="card">
      ${e.photo_path ? `<img src="${API}${e.photo_path}" data-img="${API}${e.photo_path}" alt="">` : ''}
      <div class="info">
        <div class="name">${esc(e.student_name)}</div>
        <div class="group">${esc(e.group_name)}</div>
        <div class="desc">${esc(e.description)}</div>
        ${filesHTML(e.files)}
        <div class="time">${new Date(e.created_at).toLocaleString('ru')}</div>
      </div>
      <button class="edit" data-edit="${e.id}" title="Редактировать">✎</button>
      <button class="del" data-del="${e.id}" title="Удалить">&times;</button>
    </div>
  `;
}

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

function renderGrid() {
  const grid = document.getElementById('grid');
  if (!currentEntries.length) {
    grid.className = 'grid';
    grid.innerHTML = '<div class="empty">Ничего не найдено</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('');
  }
}

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();
  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();
}

async function openEdit(id) {
  const e = currentEntries.find(x => x.id === id);
  if (!e) return;
  editId = id;
  fillAutocomplete();
  document.getElementById('editName').value = e.student_name;
  document.getElementById('editDesc').value = e.description;
  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;
  document.getElementById('editModal').classList.add('open');
}

function closeEdit() {
  document.getElementById('editModal').classList.remove('open');
  document.getElementById('editFiles').value = '';
  document.getElementById('editFilesPreview').innerHTML = '';
  editId = null;
}

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 res = await fetch(`${API}/api/entries/${editId}`, {
    method: 'PUT',
    headers: hdrJson(),
    body: JSON.stringify({ student_name: name, group_id, description })
  });
  if (!res.ok) { const err = await res.json(); alert(err.error); return; }

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

  closeEdit();
  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);
  });
});

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('linkAnonymizeNames').checked = false;
  document.getElementById('linkPassword').value = '';
  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 anonymize_names = document.getElementById('linkAnonymizeNames').checked;
  const access_password = document.getElementById('linkPassword').value;
  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(`${API}/api/links`, {
    method: 'POST',
    headers: hdrJson(),
    body: JSON.stringify({ name, group_id, student_name: student_name || null, date_from: date_from || null, date_to: date_to || null, anonymize_names, expires_at, access_password: access_password || null })
  });
  if (!res.ok) { const err = await res.json(); alert(err.error || 'Ошибка'); return; }
  const link = await res.json();
  createdLinkUrl = `${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 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('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();
  }
})();