Improve product not found dialog

lib/l10n/app_en.arb

@@ -1128,5 +1128,13 @@
   "themeMode": "Theme mode",
   "darkMode": "Always dark mode",
   "lightMode": "Always light mode",
-  "systemMode": "System settings"
+  "systemMode": "System settings",
+  "productNotFoundOpenFoodFacts": "You can add this product to Open Food Facts to help the community!",
+  "@productNotFoundOpenFoodFacts": {
+  "description": "Label shown when product is not found to encourage users to go on Open Food Facts and add it themselves"
+  },
+  "addToOpenFoodFacts": "Add to Open Food Facts",
+  "@addToOpenFoodFacts": {
+    "description": "Label shown as the clickable link to go on Open Food Facts"
+   }
 }

lib/widgets/nutrition/ingredient_dialogs.dart

@@ -194,10 +194,20 @@ class IngredientScanResultDialog extends StatelessWidget {
               if (snapshot.connectionState == ConnectionState.done && ingredient == null)
                 Padding(
                   padding: const EdgeInsets.only(bottom: 8.0),
-                  child: Text(
-                    AppLocalizations.of(context).productNotFoundDescription(barcode),
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    children: [
+                      Text(
+                        AppLocalizations.of(context).productNotFoundDescription(barcode),
+                      ),
+                      const SizedBox(height: 8),
+                      Text(
+                        AppLocalizations.of(context).productNotFoundOpenFoodFacts,
+                      ),
+                    ],
                   ),
                 ),
+
               if (ingredient != null)
                 Padding(
                   padding: const EdgeInsets.only(bottom: 8.0),
@@ -241,6 +251,17 @@ class IngredientScanResultDialog extends StatelessWidget {
               Navigator.of(context).pop();
             },
           ),
+        // if didn't find a result after scanning
+        if (snapshot.connectionState == ConnectionState.done && ingredient == null)
+          TextButton.icon(
+            key: const Key('ingredient-scan-result-dialog-open-food-facts-button'),
+            icon: const Icon(Icons.add_circle_outline),
+            label: Text(AppLocalizations.of(context).addToOpenFoodFacts),
+            onPressed: () {
+              launchURL('https://world.openfoodfacts.org/cgi/product.pl', context);
+              Navigator.of(context).pop();
+            },
+          ),
         // if didn't match, or we're still waiting
         TextButton(
           key: const Key('ingredient-scan-result-dialog-close-button'),

test/widgets/nutrition/ingredient_dialogs_test.dart

@@ -0,0 +1,136 @@
+/*
+ * This file is part of wger Workout Manager <https://github.com/wger-project>.
+ * Copyright (c) 2026 wger Team
+ *
+ * wger Workout Manager is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:wger/l10n/generated/app_localizations.dart';
+import 'package:wger/models/nutrition/ingredient.dart';
+import 'package:wger/widgets/nutrition/ingredient_dialogs.dart';
+
+Future<void> pumpIngredientScanDialog(
+  WidgetTester tester, {
+  required AsyncSnapshot<Ingredient?> snapshot,
+  required String barcode,
+}) async {
+  await tester.pumpWidget(
+    MaterialApp(
+      locale: const Locale('en'),
+      localizationsDelegates: AppLocalizations.localizationsDelegates,
+      supportedLocales: AppLocalizations.supportedLocales,
+      home: Scaffold(
+        body: Builder(
+          builder: (context) => ElevatedButton(
+            onPressed: () {
+              showDialog(
+                context: context,
+                builder: (_) => IngredientScanResultDialog(
+                  snapshot,
+                  barcode,
+                  (int id, String name, num? amount) {}, // Mock callback
+                ),
+              );
+            },
+            child: const Text('Show Dialog'),
+          ),
+        ),
+      ),
+    ),
+  );
+}
+
+void main() {
+  group('IngredientScanResultDialog tests', () {
+    const testBarcode = '1234567890123';
+
+    testWidgets(
+      'shows Open Food Facts button when product not found',
+      (WidgetTester tester) async {
+        // Arrange
+        const snapshot = AsyncSnapshot<Ingredient?>.withData(
+          ConnectionState.done,
+          null, // null = product not found
+        );
+
+        // Act
+        await pumpIngredientScanDialog(
+          tester,
+          snapshot: snapshot,
+          barcode: testBarcode,
+        );
+
+        // Open dialog
+        await tester.tap(find.text('Show Dialog'));
+        await tester.pumpAndSettle();
+
+        // Assert
+        expect(find.byType(AlertDialog), findsOneWidget);
+
+        // Verify the Open Food Facts button exists
+        expect(
+          find.byKey(const Key('ingredient-scan-result-dialog-open-food-facts-button')),
+          findsOneWidget,
+        );
+
+        // Verify the close button exists
+        expect(
+          find.byKey(const Key('ingredient-scan-result-dialog-close-button')),
+          findsOneWidget,
+        );
+
+        // Verify the continue button does not exist
+        expect(
+          find.byKey(const Key('ingredient-scan-result-dialog-confirm-button')),
+          findsNothing,
+        );
+      },
+    );
+
+    testWidgets(
+      'tapping Open Food Facts button closes the dialog',
+      (WidgetTester tester) async {
+        // Arrange
+        const snapshot = AsyncSnapshot<Ingredient?>.withData(
+          ConnectionState.done,
+          null,
+        );
+
+        await pumpIngredientScanDialog(
+          tester,
+          snapshot: snapshot,
+          barcode: testBarcode,
+        );
+
+        // Open dialog
+        await tester.tap(find.text('Show Dialog'));
+        await tester.pumpAndSettle();
+
+        // Verify dialog is open
+        expect(find.byType(AlertDialog), findsOneWidget);
+
+        // Act: Tap the Open Food Facts button
+        await tester.tap(
+          find.byKey(const Key('ingredient-scan-result-dialog-open-food-facts-button')),
+        );
+        await tester.pumpAndSettle();
+
+        // Assert: Dialog should be closed
+        expect(find.byType(AlertDialog), findsNothing);
+      },
+    );
+  });
+}