From fda45437753c6da970a3420fbdfbcf6d8142e17c Mon Sep 17 00:00:00 2001
From: MarcWieland <marc@wieland.de>
Date: Tue, 18 Nov 2025 10:19:15 +0100
Subject: [PATCH] QR Scanner final fertig

---
 FilterCair.Client/Pages/FilterForm.razor      | 17 ++-----
 FilterCair.Client/Pages/Stations.razor        | 45 ++++++++++++++---
 .../Services/API/FilterService.cs             | 48 +++++++++++++++++++
 3 files changed, 92 insertions(+), 18 deletions(-)

diff --git a/FilterCair.Client/Pages/FilterForm.razor b/FilterCair.Client/Pages/FilterForm.razor
index af8a825..db8f2a5 100644
--- a/FilterCair.Client/Pages/FilterForm.razor
+++ b/FilterCair.Client/Pages/FilterForm.razor
@@ -105,33 +105,26 @@
     }
 
 
-    protected override void OnInitialized()
-    {
-        var uri = NavManager.ToAbsoluteUri(NavManager.Uri);
-        var query = System.Web.HttpUtility.ParseQueryString(uri.Query);
-        var stationIdStr = query.Get("stationId");
-        if (int.TryParse(stationIdStr, out int stationId))
-        {
-            filter.StationId = stationId;
-        }
-    }
-
     protected override async Task OnInitializedAsync()
     {
         var uri = NavManager.ToAbsoluteUri(NavManager.Uri);
         var query = System.Web.HttpUtility.ParseQueryString(uri.Query);
 
+        // Standardwerte setzen
         if (int.TryParse(query.Get("customerId"), out int customerId))
             filter.CustomerId = customerId;
 
         if (int.TryParse(query.Get("stationId"), out int stationId))
             filter.StationId = stationId;
 
-        if (int.TryParse(query.Get("filterId"), out int filterId))
+        if (int.TryParse(query.Get("filterId"), out int filterId) && filterId > 0)
         {
             var existing = await FilterService.GetFilterByIdAsync(filterId);
             if (existing != null)
+            {
                 filter = existing;
+                StateHasChanged();
+            }
         }
     }
 
diff --git a/FilterCair.Client/Pages/Stations.razor b/FilterCair.Client/Pages/Stations.razor
index 5ee7753..b268cf5 100644
--- a/FilterCair.Client/Pages/Stations.razor
+++ b/FilterCair.Client/Pages/Stations.razor
@@ -115,12 +115,45 @@
     private async Task StartScan() => await JS.InvokeVoidAsync("QRScanner.start");
     private async Task StopScan() => await JS.InvokeVoidAsync("QRScanner.stop");
 
-    [JSInvokable]
-    public void OnQrDetected(string code)
+[JSInvokable]
+public async Task OnQrDetected(string code)
+{
+    scanResult = code;
+    StateHasChanged();
+
+    // QR-Code bereinigen (falls Leerzeichen oder Zeilenumbrüche drin sind)
+    string qrCode = code.Trim();
+
+    if (string.IsNullOrEmpty(qrCode))
     {
-        scanResult = code;
-        // TODO: später Filter anhand QR-Code öffnen
-        // Nav.NavigateTo($"/stations/{customerId}/filterdetail/{code}");
-        StateHasChanged();
+        await JS.InvokeVoidAsync("showToast", "Ungültiger QR-Code", "error");
+        return;
+    }
+
+    try
+    {
+        // Suche in Offline-DB nach Filter mit diesem QR-Code
+        var filter = await FilterService.GetFilterByQrCodeAsync(qrCode);
+
+        if (filter != null)
+        {
+            await JS.InvokeVoidAsync("showToast", $"Filter gefunden: {filter.Bezeichnung}", "success");
+
+            // Stoppe Kamera sofort
+            await StopScan();
+
+            // Navigiere direkt zur Bearbeitung – mit allen nötigen IDs
+            Nav.NavigateTo($"/filterform?filterId={filter.Id}&customerId={filter.CustomerId}&stationId={filter.StationId}");
+        }
+        else
+        {
+            await JS.InvokeVoidAsync("showToast", $"QR-Code '{qrCode}' nicht in Offline-Daten gefunden", "warning");
+        }
+    }
+    catch (Exception ex)
+    {
+        await JS.InvokeVoidAsync("showToast", "Fehler beim Suchen des Filters", "error");
+        Console.WriteLine(ex);
     }
 }
+}
diff --git a/FilterCair.Client/Services/API/FilterService.cs b/FilterCair.Client/Services/API/FilterService.cs
index beed510..dc8ab32 100644
--- a/FilterCair.Client/Services/API/FilterService.cs
+++ b/FilterCair.Client/Services/API/FilterService.cs
@@ -105,6 +105,54 @@ namespace FilterCair.Client.Services.API
                 return localFilters.FirstOrDefault(f => f.Id == id);
             }
         }
+
+        // Füge diese Methode einfach in deine FilterService-Klasse ein:
+        public async Task<FilterModel?> GetFilterByQrCodeAsync(string qrCode)
+        {
+            if (string.IsNullOrWhiteSpace(qrCode))
+                return null;
+
+            qrCode = qrCode.Trim();
+
+            // Immer zuerst offline suchen – das wollen wir beim QR-Scan ja genau!
+            // Wir laden ALLE Filter aus der IndexedDB (stationId = 0 bedeutet "alle")
+            var allFilters = await _local.GetFiltersAsync(0);
+
+            var found = allFilters.FirstOrDefault(f =>
+                !string.IsNullOrEmpty(f.QRCode) &&
+                f.QRCode.Trim().Equals(qrCode, StringComparison.OrdinalIgnoreCase));
+
+            if (found != null)
+            {
+                Console.WriteLine($"QR-Code '{qrCode}' gefunden → Filter ID {found.Id} ({found.Bezeichnung})");
+                return found;
+            }
+
+            // Optional: Falls online und nicht gefunden → nochmal beim Server nachfragen?
+            // (Für den Techniker vor Ort meist nicht nötig – aber kann man später einbauen)
+            bool isOnline = await IsOnlineAsync();
+            if (isOnline)
+            {
+                try
+                {
+                    var fromServer = await _http.GetFromJsonAsync<FilterModel>($"{BaseUrl}/byQr/{qrCode}");
+                    if (fromServer != null)
+                    {
+                        await _local.SaveFiltersAsync(fromServer.StationId, new[] { fromServer }.ToList());
+                        return fromServer;
+                    }
+                }
+                catch
+                {
+                    // Ignorieren – war nur ein Bonus-Versuch
+                }
+            }
+
+            Console.WriteLine($"QR-Code '{qrCode}' nicht gefunden");
+            return null;
+        }
+
+
     }