Compass app (#2446)

compass_app/app/lib/data/repositories/destination/destination_repository.dart

@@ -0,0 +1,12 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../../../domain/models/destination/destination.dart';
+import '../../../utils/result.dart';
+
+/// Data source with all possible destinations
+abstract class DestinationRepository {
+  /// Get complete list of destinations
+  Future<Result<List<Destination>>> getDestinations();
+}

compass_app/app/lib/data/repositories/destination/destination_repository_local.dart

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+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../../../domain/models/destination/destination.dart';
+import '../../../utils/result.dart';
+import '../../services/local/local_data_service.dart';
+import 'destination_repository.dart';
+
+/// Local implementation of DestinationRepository
+/// Uses data from assets folder
+class DestinationRepositoryLocal implements DestinationRepository {
+  DestinationRepositoryLocal({
+    required LocalDataService localDataService,
+  }) : _localDataService = localDataService;
+
+  final LocalDataService _localDataService;
+
+  /// Obtain list of destinations from local assets
+  @override
+  Future<Result<List<Destination>>> getDestinations() async {
+    try {
+      return Result.ok(await _localDataService.getDestinations());
+    } on Exception catch (error) {
+      return Result.error(error);
+    }
+  }
+}

compass_app/app/lib/data/repositories/destination/destination_repository_remote.dart

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+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import '../../../domain/models/destination/destination.dart';
+import '../../../utils/result.dart';
+import '../../services/api/api_client.dart';
+import 'destination_repository.dart';
+
+/// Remote data source for [Destination].
+/// Implements basic local caching.
+/// See: https://docs.flutter.dev/get-started/fwe/local-caching
+class DestinationRepositoryRemote implements DestinationRepository {
+  DestinationRepositoryRemote({
+    required ApiClient apiClient,
+  }) : _apiClient = apiClient;
+
+  final ApiClient _apiClient;
+
+  List<Destination>? _cachedData;
+
+  @override
+  Future<Result<List<Destination>>> getDestinations() async {
+    if (_cachedData == null) {
+      // No cached data, request destinations
+      final result = await _apiClient.getDestinations();
+      if (result is Ok) {
+        // Store value if result Ok
+        _cachedData = result.asOk.value;
+      }
+      return result;
+    } else {
+      // Return cached data if available
+      return Result.ok(_cachedData!);
+    }
+  }
+}