Prices: if the selected location has another currency, prompt the use…

…r to change (#6239)

packages/smooth_app/lib/l10n/app_en.arb

@@ -2235,6 +2235,37 @@
     "prices_privacy_warning_title": "Privacy warning",
     "prices_privacy_warning_message": "Prices will be public, along with the store they refer to.\nThat might allow people who know about your Open Food Facts pseudonym to:\n* infer in which area you live\n* know what you are buying\nIf you are uneasy with that, please change your pseudonym, or create a new Open Food Facts account and log into the app with it.",
     "prices_unknown_product": "Unknown product",
+    "prices_currency_change_proposal_title": "Change the currency?",
+    "prices_currency_change_proposal_message": "Your current currency is **{currency}**. Would you like to change it to **{newCurrency}**?",
+    "@prices_currency_change_proposal_message": {
+        "description": "Message to ask the user if they want to change the currency",
+        "placeholders": {
+            "currency": {
+                "type": "String"
+            },
+            "newCurrency": {
+                "type": "String"
+            }
+        }
+    },
+    "prices_currency_change_proposal_action_approve": "Yes, use {newCurrency}",
+    "@prices_currency_change_proposal_action_approve": {
+        "description": "Button to approve the currency change",
+        "placeholders": {
+            "newCurrency": {
+                "type": "String"
+            }
+        }
+    },
+    "prices_currency_change_proposal_action_cancel": "No, keep {currency}",
+    "@prices_currency_change_proposal_action_cancel": {
+        "description": "Button to cancel the currency change",
+        "placeholders": {
+            "currency": {
+                "type": "String"
+            }
+        }
+    },
     "@prices_unknown_product": {
         "description": "Very small text, in the context of prices, to say that the product is unknown"
     },

packages/smooth_app/lib/pages/prices/price_location_card.dart

@@ -15,13 +15,19 @@ import 'package:smooth_app/pages/search/search_page.dart';
 
 /// Card that displays the location for price adding.
 class PriceLocationCard extends StatelessWidget {
-  const PriceLocationCard();
+  const PriceLocationCard({
+    required this.onLocationChanged,
+  });
+
+  final Function(OsmLocation? oldLocation, OsmLocation location)
+      onLocationChanged;
 
   @override
   Widget build(BuildContext context) {
     final PriceModel model = context.watch<PriceModel>();
     final AppLocalizations appLocalizations = AppLocalizations.of(context);
     final OsmLocation? location = model.location;
+
     return SmoothCardWithRoundedHeader(
       title: appLocalizations.prices_location_subtitle,
       leading: const Icon(Icons.shopping_cart),
@@ -73,6 +79,8 @@ class PriceLocationCard extends StatelessWidget {
                 final List<OsmLocation> newOsmLocations =
                     await daoOsmLocation.getAll();
                 model.locations = newOsmLocations;
+
+                onLocationChanged.call(location, model.location!);
               },
       ),
     );

packages/smooth_app/lib/pages/prices/product_price_add_page.dart

@@ -6,6 +6,7 @@ import 'package:provider/provider.dart';
 import 'package:smooth_app/data_models/preferences/user_preferences.dart';
 import 'package:smooth_app/database/dao_osm_location.dart';
 import 'package:smooth_app/database/local_database.dart';
+import 'package:smooth_app/generic_lib/bottom_sheets/smooth_bottom_sheet.dart';
 import 'package:smooth_app/generic_lib/design_constants.dart';
 import 'package:smooth_app/generic_lib/dialogs/smooth_alert_dialog.dart';
 import 'package:smooth_app/generic_lib/widgets/smooth_back_button.dart';
@@ -27,6 +28,7 @@ import 'package:smooth_app/themes/theme_provider.dart';
 import 'package:smooth_app/widgets/smooth_app_bar.dart';
 import 'package:smooth_app/widgets/smooth_expandable_floating_action_button.dart';
 import 'package:smooth_app/widgets/smooth_scaffold.dart';
+import 'package:smooth_app/widgets/smooth_text.dart';
 import 'package:smooth_app/widgets/will_pop_scope.dart';
 
 /// Single page that displays all the elements of price adding.
@@ -134,7 +136,17 @@ class _ProductPriceAddPageState extends State<ProductPriceAddPage>
                     const SizedBox(height: LARGE_SPACE),
                     const PriceDateCard(),
                     const SizedBox(height: LARGE_SPACE),
-                    const PriceLocationCard(),
+                    PriceLocationCard(
+                      onLocationChanged: (
+                        OsmLocation? oldLocation,
+                        OsmLocation location,
+                      ) =>
+                          _updateCurrency(
+                        oldLocation,
+                        location,
+                        model,
+                      ),
+                    ),
                     const SizedBox(height: LARGE_SPACE),
                     const PriceCurrencyCard(),
                     const SizedBox(height: LARGE_SPACE),
@@ -176,6 +188,62 @@ class _ProductPriceAddPageState extends State<ProductPriceAddPage>
     );
   }
 
+  Future<void> _updateCurrency(
+    OsmLocation? oldLocation,
+    OsmLocation location,
+    PriceModel model,
+  ) async {
+    if (location.countryCode != null) {
+      final Currency? newCurrency =
+          OpenFoodFactsCountry.fromOffTag(location.countryCode)?.currency;
+
+      if (newCurrency != null && model.currency != newCurrency) {
+        final AppLocalizations appLocalizations = AppLocalizations.of(context);
+        final SmoothColorsThemeExtension extension =
+            context.extension<SmoothColorsThemeExtension>();
+
+        final Currency? currency =
+            await showSmoothListOfChoicesModalSheet<Currency?>(
+          context: context,
+          title: appLocalizations.prices_currency_change_proposal_title,
+          header: ColoredBox(
+            color: extension.primaryLight,
+            child: Padding(
+              padding: const EdgeInsetsDirectional.symmetric(
+                horizontal: LARGE_SPACE,
+                vertical: MEDIUM_SPACE,
+              ),
+              child: TextWithBoldParts(
+                text: appLocalizations.prices_currency_change_proposal_message(
+                    model.currency.name, newCurrency.name),
+                textStyle: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                      fontWeight: FontWeight.w500,
+                    ),
+              ),
+            ),
+          ),
+          labels: <String>[
+            appLocalizations.prices_currency_change_proposal_action_approve(
+              newCurrency.name,
+            ),
+            appLocalizations.prices_currency_change_proposal_action_cancel(
+              model.currency.name,
+            ),
+          ],
+          prefixIcons: <Widget>[
+            Icon(Icons.check_circle_rounded, color: extension.success),
+            Icon(Icons.cancel_rounded, color: extension.error),
+          ],
+          values: <Currency?>[newCurrency, null],
+        );
+
+        if (currency != null) {
+          model.currency = currency;
+        }
+      }
+    }
+  }
+
   Future<bool?> _doesAcceptWarning({required final bool justInfo}) async {
     final AppLocalizations appLocalizations = AppLocalizations.of(context);
     return showDialog<bool>(