fix(app): unlimited loading screen when backend is not reachable (#364)

* Initial plan

* Add error handling for unlimited loading screen bug

Co-authored-by: antontranelis <31516529+antontranelis@users.noreply.github.com>

* Complete fix for unlimited loading screen bug with proper state management

Co-authored-by: antontranelis <31516529+antontranelis@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: antontranelis <31516529+antontranelis@users.noreply.github.com>

app/src/App.tsx

@@ -71,6 +71,15 @@ function App() {
   const [layers, setLayers] = useState<any>()
   const [layerPageRoutes, setLayerPageRoutes] = useState<any>()
   const [loading, setLoading] = useState<boolean>(true)
+  const [error, setError] = useState<string | null>(null)
+
+  const retryConnection = () => {
+    setError(null)
+    setLoading(true)
+    if (mapApiInstance) {
+      getMap()
+    }
+  }
 
   const [embedded, setEmbedded] = useState<boolean>(true)
 
@@ -94,12 +103,27 @@ function App() {
   }, [mapApiInstance])
 
   const getMap = async () => {
+    try {
       const map = await mapApiInstance?.getItems()
       map && setMap(map)
       map && map != 'null' && setLayersApiInstance(new layersApi(map.id))
       map && map != 'null' && map.own_tag_space
         ? setTagsApi(new itemsApi<Tag>('tags', undefined, map.id))
         : setTagsApi(new itemsApi<Tag>('tags'))
+      // eslint-disable-next-line no-catch-all/no-catch-all
+    } catch (error: any) {
+      // eslint-disable-next-line no-console
+      console.error('Failed to load map:', error)
+      setError(
+        typeof error === 'string'
+          ? error
+          : error?.errors?.[0]?.message ||
+              error?.message ||
+              'Failed to connect to the server. Please check your connection and try again.',
+      )
+      setLoading(false)
+      // Don't rethrow since we're handling the error by setting error state
+    }
   }
 
   useEffect(() => {
@@ -107,6 +131,7 @@ function App() {
   }, [layersApiInstance])
 
   const getLayers = async () => {
+    try {
       const layers = await layersApiInstance?.getItems()
       layers && setLayers(layers)
       setLayerPageRoutes(
@@ -126,6 +151,20 @@ function App() {
             name: l.name, // name that appear in Sidebar
           })),
       )
+      // eslint-disable-next-line no-catch-all/no-catch-all
+    } catch (error: any) {
+      // eslint-disable-next-line no-console
+      console.error('Failed to load layers:', error)
+      setError(
+        typeof error === 'string'
+          ? error
+          : error?.errors?.[0]?.message ||
+              error?.message ||
+              'Failed to load map layers. Please check your permissions and try again.',
+      )
+      setLoading(false)
+      // Don't rethrow since we're handling the error by setting error state
+    }
   }
 
   useEffect(() => {
@@ -140,8 +179,11 @@ function App() {
       link.href = map?.logo && config.apiUrl + 'assets/' + map.logo // Specify the path to your favicon
     }
 
+    // Only set loading to false when both map and layers are successfully loaded
+    if (map && layers) {
       setLoading(false)
-  }, [map])
+    }
+  }, [map, layers])
 
   const currentUrl = window.location.href
   const bottomRoutes = getBottomRoutes(currentUrl)
@@ -253,6 +295,35 @@ function App() {
         </div>
       </div>
     )
+  else if (error)
+    return (
+      <div className='tw:flex tw:items-center tw:justify-center tw:h-screen tw:bg-base-100'>
+        <div className='tw:max-w-md tw:mx-auto tw:p-6 tw:text-center'>
+          <div className='tw:mb-4'>
+            <svg
+              className='tw:w-16 tw:h-16 tw:mx-auto tw:text-error tw:mb-4'
+              fill='none'
+              stroke='currentColor'
+              viewBox='0 0 24 24'
+            >
+              <path
+                strokeLinecap='round'
+                strokeLinejoin='round'
+                strokeWidth={2}
+                d='M12 9v2m0 4h.01m-6.938 4h13.856c1.54 0 2.502-1.667 1.732-2.5L13.732 4c-.77-.833-1.732-.833-2.5 0L4.314 16.5c-.77.833.192 2.5 1.732 2.5z'
+              />
+            </svg>
+          </div>
+          <h2 className='tw:text-xl tw:font-semibold tw:text-base-content tw:mb-2'>
+            Connection Error
+          </h2>
+          <p className='tw:text-base-content/70 tw:mb-6'>{error}</p>
+          <button onClick={retryConnection} className='tw:btn tw:btn-primary'>
+            Try Again
+          </button>
+        </div>
+      </div>
+    )
   else
     return (
       <div className='outer'>