new project stable version

lib/domain/usecase/create_pin_usecase.dart

@@ -0,0 +1,27 @@
+import 'package:be_happy/domain/repositories/pin_repository.dart';
+
+import '../repositories/auth_repository.dart';
+
+class CreatePinUseCase {
+  final PinRepository repository;
+
+  CreatePinUseCase(this.repository);
+
+  Future<void> call(String pin) async {
+    _validate(pin);
+
+    final hashed = _hash(pin);
+    await repository.savePin(hashed);
+  }
+
+  void _validate(String pin) {
+    if (pin.length != 6) {
+      throw Exception('PIN must be 6 digits');
+    }
+  }
+
+  String _hash(String pin) {
+    // временно просто pin
+    return pin;
+  }
+}