sidebar menu improvement

Reviewed-on: http://git.enode/deployer3000/trust-module-frontend/pulls/44
Reviewed-by: Vladislav Drozdov <ya2@ya.ru>

src/Components/Layout/SidebarMenuWrapper.jsx

@@ -5,16 +5,54 @@ import axios from 'axios';
 
 const SidebarMenuWrapper = ({ isDarkMode, setIsDarkMode, onMenuSelect }) => {
     const [menuData, setMenuData] = useState(null);
+    const [lastModified, setLastModified] = useState(null);
     const [loading, setLoading] = useState(true);
     const [error, setError] = useState(null);
     const [editingItem, setEditingItem] = useState(null);
     const [editModalOpen, setEditModalOpen] = useState(false);
+    const [backgroundLoading, setBackgroundLoading] = useState(false);
 
+    // Загружаем меню из localStorage при инициализации
+    useEffect(() => {
+        const loadCachedMenu = () => {
+            try {
+                const cached = localStorage.getItem('menuCache');
+                if (cached) {
+                    const { data, timestamp } = JSON.parse(cached);
+                    setMenuData(data);
+                    setLastModified(timestamp);
+                }
+            } catch (e) {
+                console.warn('Failed to load menu from cache', e);
+            }
+        };
+
+        loadCachedMenu();
+    }, []);
+
+    // Основная загрузка меню
     useEffect(() => {
         const fetchMenuData = async () => {
             try {
-                const response = await axios.get(`${import.meta.env.VITE_BACK_URL}/api/menu/full`);
-                setMenuData(response.data); // axios хранит данные в response.data
+                setLoading(true);
+                const headers = lastModified ? { 'If-Modified-Since': lastModified } : {};
+
+                const response = await axios.get(`${import.meta.env.VITE_BACK_URL}/api/menu/full`, {
+                    headers,
+                    validateStatus: status => status === 200 || status === 304
+                });
+
+                if (response.status === 200) {
+                    const newLastModified = response.headers['last-modified'];
+                    setMenuData(response.data);
+                    setLastModified(newLastModified);
+
+                    // Сохраняем в кэш
+                    localStorage.setItem('menuCache', JSON.stringify({
+                        data: response.data,
+                        timestamp: newLastModified
+                    }));
+                }
             } catch (err) {
                 console.error('Error fetching menu data:', err);
                 setError(err.message || 'Failed to fetch menu data');
@@ -26,6 +64,40 @@ const SidebarMenuWrapper = ({ isDarkMode, setIsDarkMode, onMenuSelect }) => {
         fetchMenuData();
     }, []);
 
+    // Фоновая проверка обновлений
+    useEffect(() => {
+        if (!lastModified) return;
+
+        const checkForUpdates = async () => {
+            try {
+                setBackgroundLoading(true);
+                const response = await axios.get(`${import.meta.env.VITE_BACK_URL}/api/menu/check-updates`, {
+                    headers: { 'If-Modified-Since': lastModified }
+                });
+
+                if (response.data.hasUpdates) {
+                    // Если есть обновления, загружаем их в фоне
+                    const updateResponse = await axios.get(`${import.meta.env.VITE_BACK_URL}/api/menu/full`);
+                    setMenuData(updateResponse.data);
+                    setLastModified(updateResponse.headers['last-modified']);
+
+                    localStorage.setItem('menuCache', JSON.stringify({
+                        data: updateResponse.data,
+                        timestamp: updateResponse.headers['last-modified']
+                    }));
+                }
+            } catch (err) {
+                console.warn('Background update check failed', err);
+            } finally {
+                setBackgroundLoading(false);
+            }
+        };
+
+        // Проверяем обновления каждые 5 минут
+        const interval = setInterval(checkForUpdates, 5 * 60 * 1000);
+        return () => clearInterval(interval);
+    }, [lastModified]);
+
     const handleSaveChanges = async (updatedItem) => {
         try {
             const response = await axios.put(