Refactored json storage

lib/repositories/json/json_repository.dart

@@ -0,0 +1,32 @@
+import 'dart:convert';
+
+import 'package:tunas/clients/storage/storage_client.dart';
+import 'package:tunas/repositories/json/models/json.dart';
+
+class JsonRepository {
+  String accountFile = 'tunas_main_account.json';
+
+  final StorageClient _storageClient;
+
+  JsonRepository({
+    required storageClient,
+  }) : _storageClient = storageClient;
+
+  saveJson(Json json) async {
+    await _storageClient.save(json.getJsonFileName(), jsonEncode(json.toJson()));
+  }
+
+  Future<T> loadJson<T extends Json>(Json json, JsonFactory<T> jsonFactory) async {
+    String jsonString = await _storageClient.load(json.getJsonFileName());
+
+    if (jsonString.isEmpty) {
+      return jsonFactory.fromJson({});
+    } else {
+      return jsonFactory.fromJson(jsonDecode(jsonString));
+    }
+  }
+
+  deleteJson(Json json) async {
+    await _storageClient.delete(json.getJsonFileName());
+  }
+}