feat: 5326 - add prices to proof from gallery (and thumbnails) (#5670)

* feat: 5326 - add prices to proof from gallery (and thumbnails)

New files:
* `background_task_add_other_price.dart`: Background task about adding prices to an existing proof.
* `background_task_price.dart`: Abstract background task about adding prices.

Impacted files:
* `background_task_add_price.dart`: refactored using new class `BackgroundTaskPrice`
* `get_prices_model.dart`: new web app root address
* `operation_type.dart`: added the new background task
* `osm_location.dart`: minor refactoring
* `price_currency_selector.dart`: additional case - proof instead of input; refactored using model
* `price_date_card.dart`: additional case - proof instead of input
* `price_location_card.dart`: additional case - proof instead of input
* `price_model.dart`: added specific constructor and background task for the "existing proof" case
* `price_product_widget.dart`: minor refactoring
* `price_proof_card.dart`: additional case - proof instead of input
* `price_proof_page.dart`: added a FAB to add price from an existing proof; now displaying the thumbnail and then the full proof
* `price_user_button.dart`: new web app root address
* `prices_proofs_page.dart`: proof thumnails; new web app root address
* `prices_users_page.dart`: new web app root address
* `product_price_add_page.dart`: now accepting a model as parameter, in order to deal with both old proofs and new prices
* `pubspec.lock`: wtf
* `pubspec.yaml`: upgraded to `openfoodfacts` `3.16.0`, for proof thumbnails
* `user_preferences_account.dart`: new web app root address

* More flexibility with potentially null data

Impacted files:
* `osm_location.dart`: more flexibility with potentially null data
* `price_model.dart`: more flexibility with potentially null data; better display of thumbnail image
* `price_proof_page.dart`: more flexibility with potentially null data

packages/smooth_app/lib/background/background_task_add_other_price.dart

@@ -0,0 +1,123 @@
+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:openfoodfacts/openfoodfacts.dart';
+import 'package:provider/provider.dart';
+import 'package:smooth_app/background/background_task.dart';
+import 'package:smooth_app/background/background_task_price.dart';
+import 'package:smooth_app/background/operation_type.dart';
+import 'package:smooth_app/database/local_database.dart';
+
+/// Background task about adding prices to an existing proof.
+class BackgroundTaskAddOtherPrice extends BackgroundTaskPrice {
+  BackgroundTaskAddOtherPrice._({
+    required super.processName,
+    required super.uniqueId,
+    required super.stamp,
+    // single
+    required this.proofId,
+    required super.date,
+    required super.currency,
+    required super.locationOSMId,
+    required super.locationOSMType,
+    // multi
+    required super.barcodes,
+    required super.pricesAreDiscounted,
+    required super.prices,
+    required super.pricesWithoutDiscount,
+  });
+
+  BackgroundTaskAddOtherPrice.fromJson(super.json)
+      : proofId = json[_jsonTagProofId] as int,
+        super.fromJson();
+
+  static const String _jsonTagProofId = 'proofId';
+
+  static const OperationType _operationType = OperationType.addOtherPrice;
+
+  final int proofId;
+
+  @override
+  Map<String, dynamic> toJson() {
+    final Map<String, dynamic> result = super.toJson();
+    result[_jsonTagProofId] = proofId;
+    return result;
+  }
+
+  /// Adds the background task about uploading a product image.
+  static Future<void> addTask({
+    required final BuildContext context,
+    required final int proofId,
+    required final DateTime date,
+    required final Currency currency,
+    required final int locationOSMId,
+    required final LocationOSMType locationOSMType,
+    required final List<String> barcodes,
+    required final List<bool> pricesAreDiscounted,
+    required final List<double> prices,
+    required final List<double?> pricesWithoutDiscount,
+  }) async {
+    final LocalDatabase localDatabase = context.read<LocalDatabase>();
+    final String uniqueId = await _operationType.getNewKey(localDatabase);
+    final BackgroundTask task = _getNewTask(
+      uniqueId: uniqueId,
+      proofId: proofId,
+      date: date,
+      currency: currency,
+      locationOSMId: locationOSMId,
+      locationOSMType: locationOSMType,
+      barcodes: barcodes,
+      pricesAreDiscounted: pricesAreDiscounted,
+      prices: prices,
+      pricesWithoutDiscount: pricesWithoutDiscount,
+    );
+    if (!context.mounted) {
+      return;
+    }
+    await task.addToManager(localDatabase, context: context);
+  }
+
+  /// Returns a new background task about changing a product.
+  static BackgroundTaskAddOtherPrice _getNewTask({
+    required final String uniqueId,
+    required final int proofId,
+    required final DateTime date,
+    required final Currency currency,
+    required final int locationOSMId,
+    required final LocationOSMType locationOSMType,
+    required final List<String> barcodes,
+    required final List<bool> pricesAreDiscounted,
+    required final List<double> prices,
+    required final List<double?> pricesWithoutDiscount,
+  }) =>
+      BackgroundTaskAddOtherPrice._(
+        uniqueId: uniqueId,
+        processName: _operationType.processName,
+        proofId: proofId,
+        date: date,
+        currency: currency,
+        locationOSMId: locationOSMId,
+        locationOSMType: locationOSMType,
+        barcodes: barcodes,
+        pricesAreDiscounted: pricesAreDiscounted,
+        prices: prices,
+        pricesWithoutDiscount: pricesWithoutDiscount,
+        stamp: BackgroundTaskPrice.getStamp(
+          date: date,
+          locationOSMId: locationOSMId,
+          locationOSMType: locationOSMType,
+        ),
+      );
+
+  @override
+  Future<void> execute(final LocalDatabase localDatabase) async {
+    final String bearerToken = await getBearerToken();
+
+    await addPrices(
+      bearerToken: bearerToken,
+      proofId: proofId,
+    );
+
+    await closeSession(bearerToken: bearerToken);
+  }
+}