let items = [];
let filteredItems = [];
let currentFilter = { status: '', search: '', requireCheck: false };
let sortField = 'name';
let sortAsc = true;
let currentUser = null;
let token = null;

const $ = (id) => document.getElementById(id);

// Токен и пользователь из localStorage
token = localStorage.getItem('token');
currentUser = JSON.parse(localStorage.getItem('user') || 'null');

async function checkAuth() {
  if (!token || !currentUser) {
    window.location.href = 'login.html';
    return;
  }
  $('userInfo').textContent = currentUser.login + (currentUser.role === 'admin' ? ' (Админ)' : '');
  $('usersBtn').style.display = currentUser.role === 'admin' ? 'inline-block' : 'none';
}

async function apiRequest(url, method = 'GET') {
  const res = await fetch(url);
  return res.json();
}

async function loadItems() {
  const data = await apiRequest('/api/items');
  if (data) {
    items = data;
    applyFilters();
  }
}

async function loadStats() {
  const stats = await apiRequest('/api/stats');
  if (!stats) return;
  $('statTotal').textContent = stats.total;
  $('statExploitation').textContent = stats.byStatus['в эксплуатации'] || 0;
  $('statWarehouse').textContent = stats.byStatus['на складе'] || 0;
  $('statRepair').textContent = stats.byStatus['в ремонте'] || 0;
  $('statWrittenOff').textContent = stats.byStatus['списано'] || 0;
  $('statRequireCheck').textContent = stats.requireCheck || 0;
  $('statOverdue').textContent = stats.overdue || 0;
}

function applyFilters() {
  filteredItems = items.filter(item => {
    if (currentFilter.status === 'require') {
      const in30Days = new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString().slice(0, 10);
      return item.nextCheckDate && item.nextCheckDate <= in30Days;
    }
    if (currentFilter.status && item.status !== currentFilter.status) return false;
    if (currentFilter.search) {
      const s = currentFilter.search.toLowerCase();
      const text = (item.name + ' ' + (item.serialNumber||'') + ' ' + item.inventoryNumber + ' ' + item.responsible + ' ' + item.location).toLowerCase();
      if (!text.includes(s)) return false;
    }
    return true;
  });
  sortItems();
  renderTable();
}

function sortItems() {
  filteredItems.sort((a, b) => {
    const aVal = a[sortField] || '';
    const bVal = b[sortField] || '';
    const cmp = aVal.localeCompare(bVal, 'ru');
    return sortAsc ? cmp : -cmp;
  });
}

function renderTable() {
  const tbody = $('tableBody');
  const today = new Date().toISOString().slice(0, 10);
  const in30Days = new Date(Date.now() + 30 * 24 * 60 * 60 * 1000).toISOString().slice(0, 10);
  const canEdit = currentUser && currentUser.role === 'admin';

  tbody.innerHTML = filteredItems.map(item => {
    let dateClass = 'check-date-ok';
    if (item.nextCheckDate && item.nextCheckDate < today) dateClass = 'check-date-overdue';
    else if (item.nextCheckDate && item.nextCheckDate <= in30Days) dateClass = 'check-date-warning';

    return `<tr>
      <td>${escapeHtml(item.name)}</td>
      <td>${escapeHtml(item.type)}</td>
      <td>${escapeHtml(item.inventoryNumber)}</td>
      <td>${escapeHtml(item.responsible)}</td>
      <td>${escapeHtml(item.location)}</td>
      <td><span class="status-badge status-${item.status}">${escapeHtml(item.status)}</span></td>
      <td class="${dateClass}">${formatDate(item.nextCheckDate)}</td>
      <td>
        ${canEdit ? `<button class="action-btn edit" onclick="editItem(${item.id})">✏️</button>` : ''}
        ${canEdit ? `<button class="action-btn delete" onclick="deleteItem(${item.id})">🗑️</button>` : ''}
        ${!canEdit ? '<span style="font-size:12px;color:var(--text-secondary);">Только просмотр</span>' : ''}
      </td>
    </tr>`;
  }).join('');
}

function escapeHtml(text) {
  const div = document.createElement('div');
  div.textContent = text || '';
  return div.innerHTML;
}

function formatDate(dateStr) {
  if (!dateStr) return '';
  const d = new Date(dateStr + 'T00:00:00');
  return d.toLocaleDateString('ru-RU', { day: '2-digit', month: '2-digit', year: 'numeric' });
}

function openModal(item = null) {
  $('itemModal').classList.add('on');
  $('modalTitle').textContent = item ? 'Редактировать запись' : 'Добавить запись';
  if (item) {
    $('itemId').value = item.id;
    $('name').value = item.name;
    $('type').value = item.type;
    $('serialNumber').value = item.serialNumber || '';
    $('inventoryNumber').value = item.inventoryNumber;
    $('location').value = item.location;
    $('responsible').value = item.responsible;
    $('status').value = item.status;
    $('checkIntervalMonths').value = item.checkIntervalMonths || 12;
    $('lastCheckDate').value = item.lastCheckDate || '';
    $('nextCheckDate').value = item.nextCheckDate;
    $('note').value = item.note || '';
  } else {
    $('itemForm').reset();
    $('itemId').value = '';
    $('checkIntervalMonths').value = 12;
    const next = new Date(Date.now() + 365 * 24 * 60 * 60 * 1000).toISOString().slice(0, 10);
    $('nextCheckDate').value = next;
  }
}

function closeModal() { $('itemModal').classList.remove('on'); }
function openLogModal() { $('logModal').classList.add('on'); loadLog(); }
function closeLogModal() { $('logModal').classList.remove('on'); }
function openUsersModal() { $('usersModal').classList.add('on'); loadUsers(); }
function closeUsersModal() { $('usersModal').classList.remove('on'); }

async function loadLog() {
  const log = await apiRequest('/api/log');
  if (!log) return;
  $('logBody').innerHTML = log.map(entry => `
    <tr>
      <td>${new Date(entry.timestamp).toLocaleString('ru-RU')}</td>
      <td>${entry.action}</td>
      <td>${escapeHtml(entry.itemName)}</td>
      <td>${escapeHtml(entry.user)}</td>
      <td>${Object.entries(entry.changes||{}).map(([k,v])=>`${k}: ${v}`).join('; ')||'—'}</td>
    </tr>
  `).join('');
}

async function loadUsers() {
  const users = await apiRequest('/api/users');
  if (!users) return;
  $('usersBody').innerHTML = users.map(u => `
    <tr>
      <td>${escapeHtml(u.login)}</td>
      <td>${u.role==='admin'?'Админ':'Пользователь'}</td>
      <td>${new Date(u.createdAt).toLocaleDateString('ru-RU')}</td>
      <td>${u.login!==currentUser.login?`<button class="action-btn delete" onclick="deleteUser('${u.login}')">🗑️</button>`:''}</td>
    </tr>
  `).join('');
}

async function saveItem(e) {
  e.preventDefault();
  const id = $('itemId').value;
  const item = {
    name: $('name').value, type: $('type').value,
    serialNumber: $('serialNumber').value, inventoryNumber: $('inventoryNumber').value,
    location: $('location').value, responsible: $('responsible').value,
    status: $('status').value, checkIntervalMonths: parseInt($('checkIntervalMonths').value) || 12,
    lastCheckDate: $('lastCheckDate').value, nextCheckDate: $('nextCheckDate').value,
    note: $('note').value
  };
  const res = await fetch('/api/items', {
    method: id ? 'PUT' : 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ id: id ? parseInt(id) : null, ...item })
  });
  const data = await res.json();
  if (data.ok) { closeModal(); await loadItems(); await loadStats(); }
  else alert('Ошибка: ' + (data.error || 'сохранения'));
}

async function deleteItem(id) {
  if (!confirm('Удалить запись?')) return;
  const res = await fetch('/api/items/' + id, { method: 'DELETE' });
  const data = await res.json();
  if (data.ok) { await loadItems(); await loadStats(); }
  else alert('Ошибка: ' + (data.error || 'удаления'));
}

async function createUser(e) {
  e.preventDefault();
  const login = $('newLogin').value, password = $('newPassword').value, role = $('newRole').value;
  const res = await fetch('/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({ login, password, role })
  });
  const data = await res.json();
  if (data.ok) { $('userForm').reset(); await loadUsers(); }
  else alert('Ошибка: ' + data.error);
}

async function deleteUser(login) {
  if (!confirm(`Удалить ${login}?`)) return;
  const res = await fetch('/api/users/' + login, { method: 'DELETE' });
  const data = await res.json();
  if (data.ok) await loadUsers();
  else alert('Ошибка: ' + data.error);
}

function logout() {
  localStorage.removeItem('token');
  localStorage.removeItem('user');
  window.location.href = 'login.html';
}

function exportCsv() {
  const head = ['Наименование','Тип','Серийный номер','Инвентарный номер','Местоположение','Ответственный','Статус','Дата последней проверки','Дата следующей проверки','Интервал (мес)','Комментарий'];
  const body = filteredItems.map(i => [i.name,i.type,i.serialNumber||'',i.inventoryNumber,i.location,i.responsible,i.status,i.lastCheckDate||'',i.nextCheckDate,i.checkIntervalMonths||'',i.note||'']
    .map(v=>'"'+String(v??'').replace(/"/g,'""')+'"').join(';'));
  const csv = '\uFEFF'+[head.join(';'),...body].join('\n');
  const a = document.createElement('a');
  a.href = URL.createObjectURL(new Blob([csv],{type:'text/csv'}));
  a.download = 'vygruzka.csv'; a.click();
}

$('addBtn').addEventListener('click', ()=>openModal());
$('exportBtn').addEventListener('click', exportCsv);
$('logBtn').addEventListener('click', openLogModal);
$('usersBtn').addEventListener('click', openUsersModal);
$('logoutBtn').addEventListener('click', logout);
$('closeModal').addEventListener('click', closeModal);
$('cancelBtn').addEventListener('click', closeModal);
$('closeLogModal').addEventListener('click', closeLogModal);
$('closeUsersModal').addEventListener('click', closeUsersModal);
$('itemForm').addEventListener('submit', saveItem);
$('userForm').addEventListener('submit', createUser);
$('searchInput').addEventListener('input', e=>{currentFilter.search=e.target.value;applyFilters();});
document.querySelectorAll('.chip').forEach(chip=>{
  chip.addEventListener('click', ()=>{
    document.querySelectorAll('.chip').forEach(c=>c.classList.remove('active'));
    chip.classList.add('active');
    currentFilter.status=chip.dataset.status;
    currentFilter.requireCheck=chip.dataset.status==='require';
    applyFilters();
  });
});
document.querySelectorAll('th[data-sort]').forEach(th=>{
  th.addEventListener('click', ()=>{
    const f=th.dataset.sort;
    sortAsc=sortField===f?!sortAsc:true; sortField=f; sortItems(); renderTable();
  });
});
$('lastCheckDate').addEventListener('change', ()=>{
  const d=$('lastCheckDate').value,m=parseInt($('checkIntervalMonths').value)||12;
  if(d){const dt=new Date(d+'T00:00:00');dt.setMonth(dt.getMonth()+m);$('nextCheckDate').value=dt.toISOString().slice(0,10);}
});
$('checkIntervalMonths').addEventListener('change', ()=>{
  const d=$('lastCheckDate').value,m=parseInt($('checkIntervalMonths').value)||12;
  if(d){const dt=new Date(d+'T00:00:00');dt.setMonth(dt.getMonth()+m);$('nextCheckDate').value=dt.toISOString().slice(0,10);}
});
window.editItem=id=>{const item=items.find(i=>i.id===id);if(item)openModal(item);};
window.deleteItem=deleteItem;
window.deleteUser=deleteUser;

checkAuth();
loadItems();
loadStats();