Neue Version

FilterCair.Client/Pages/Stations.razor

@@ -12,6 +12,17 @@
         <i class="bi bi-geo-alt me-2"></i> Stationen der Fabrik
     </h4>
 
+    @if (isPreloadingFilters)
+    {
+        <div class="alert alert-info d-flex align-items-center mt-3">
+            <div class="spinner-border spinner-border-sm me-3" role="status"></div>
+            <div>
+                <strong>Offline-Modus wird vorbereitet…</strong><br>
+                <small>Lade alle Filter dieses Kunden (@preloadedCount von @totalStations Stationen)</small>
+            </div>
+        </div>
+    }
+
     <!-- QR Scanner -->
     <div class="text-center mb-4">
         <video id="video" autoplay playsinline class="border rounded shadow-sm"
@@ -77,9 +88,13 @@
     private string? scanResult;
     private bool isLoading = true;
 
+    private bool isPreloadingFilters = false;   
+    private int preloadedCount = 0;             
+    private int totalStations = 0;
+
     protected override async Task OnInitializedAsync()
     {
-        await LoadStations();
+        await LoadStationsAndPreloadAllFilters();
     }
 
     protected override async Task OnAfterRenderAsync(bool firstRender)
@@ -90,23 +105,64 @@
         }
     }
 
-    private async Task LoadStations()
+    private async Task LoadStationsAndPreloadAllFilters()
     {
+        isLoading = true;
+        StateHasChanged();
+
         try
         {
-            isLoading = true;
+            // 1. Stationen laden
             stations = await StationService.GetStationsByCustomerAsync(customerId);
+            totalStations = stations.Count;
+
+            if (stations.Count == 0)
+            {
+                isLoading = false;
+                StateHasChanged();
+                return;
+            }
+
+            // 2. Sofort alle Filter aller Stationen vorladen (parallel!)
+            isPreloadingFilters = true;
+            preloadedCount = 0;
+            StateHasChanged();
+
+            var preloadTasks = stations.Select(async station =>
+            {
+                try
+                {
+                    // Lädt Filter + speichert automatisch im IndexedDB (durch deinen Cache-Mechanismus)
+                    await FilterService.GetFiltersByStationAsync(station.Id);
+                    preloadedCount++;
+                    StateHasChanged(); // Live-Update des Fortschritts
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine($"Preload Fehler für Station {station.Id}: {ex.Message}");
+                }
+            });
+
+            await Task.WhenAll(preloadTasks);
+
+            await JS.InvokeVoidAsync("showToast", 
+                $"✅ {preloadedCount} Stationen + alle Filter offline verfügbar!", 
+                "success");
         }
         catch (Exception ex)
         {
-            Console.WriteLine($"❌ Fehler beim Laden der Stationen: {ex.Message}");
+            await JS.InvokeVoidAsync("showToast", "Teilweise offline verfügbar", "warning");
+            Console.WriteLine(ex);
         }
         finally
         {
             isLoading = false;
+            isPreloadingFilters = false;
+            StateHasChanged();
         }
     }
 
+
     private void SelectStation(StationModel s)
     {
         Nav.NavigateTo($"/stations/{customerId}/filters/{s.Id}");

FilterCair.Shared/FilterCair.Shared.csproj

@@ -6,4 +6,8 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+  </ItemGroup>
+
 </Project>