Refactored json storage

lib/repositories/transactions/models/transaction.dart

@@ -0,0 +1,39 @@
+import 'package:uuid/uuid.dart';
+
+class Transaction {
+  String uuid;
+  DateTime date;
+  String category;
+  String description;
+  String account;
+  double value;
+
+  Transaction({
+    required this.uuid,
+    required this.date,
+    required this.category,
+    required this.description,
+    required this.account,
+    required this.value
+  });
+
+  factory Transaction.fromJson(Map<String, dynamic> json) {
+    return Transaction(
+      uuid: json['uuid'] ?? const Uuid().v8(),
+      date: DateTime.parse(json['date']),
+      category: json['category'],
+      description: json['description'],
+      account: json['account'],
+      value: double.parse(json['value']),
+    );
+  }
+
+  Map<String, String> toJson() => {
+    'uuid': uuid,
+    'date': date.toIso8601String(),
+    'category': category,
+    'description': description,
+    'account': account,
+    'value': value.toString(),
+  };
+}

lib/repositories/transactions/models/transactions.dart

@@ -0,0 +1,29 @@
+import 'package:tunas/repositories/json/models/json.dart';
+import 'package:tunas/repositories/transactions/models/transaction.dart';
+
+class Transactions implements Json {
+  List<Transaction> transactions;
+
+  Transactions({
+    this.transactions = const [],
+  });
+  
+  @override
+  Map<String, dynamic> toJson() => {
+    'transactions': transactions.map((transaction) => transaction.toJson()).toList(),
+  };
+  
+  @override
+  String getJsonFileName() {
+    return 'transactions.json';
+  }
+}
+
+class TransactionsFactory implements JsonFactory<Transactions> {
+  @override
+  Transactions fromJson(Map<String, dynamic> json) {
+    return Transactions(
+      transactions: List<Transaction>.from(json['transactions']?.map((transaction) => Transaction.fromJson(transaction))),
+    );
+  }
+}

lib/repositories/transactions/transactions_repository.dart

@@ -0,0 +1,35 @@
+import 'package:rxdart/subjects.dart';
+import 'package:tunas/repositories/json/json_repository.dart';
+import 'package:tunas/repositories/transactions/models/transaction.dart';
+import 'package:tunas/repositories/transactions/models/transactions.dart';
+
+class TransactionsRepository {
+
+  final JsonRepository _jsonRepository;
+  final _transactionsController = BehaviorSubject<List<Transaction>>.seeded(const []);
+
+  TransactionsRepository({
+    required jsonRepository,
+  }) : _jsonRepository = jsonRepository;
+
+  Stream<List<Transaction>> getTransactionsStream() {
+    return _transactionsController.asBroadcastStream();
+  }
+
+  loadTransactions() async {
+    Transactions transactions = await _jsonRepository.loadJson(Transactions(), TransactionsFactory());
+    _transactionsController.add(transactions.transactions);
+  }
+
+  saveTransactions(List<Transaction> transactionsList) async {
+    Transactions transactions = Transactions(transactions: transactionsList);
+    await _jsonRepository.saveJson(transactions);
+    _transactionsController.add(transactionsList);
+  }
+
+  deleteTransactions() async {
+    Transactions transactions = Transactions();
+    await _jsonRepository.saveJson(transactions);
+    _transactionsController.add([]);
+  }
+}