create promocode page

lib/data/models/promo_code_response_dto.dart

@@ -0,0 +1,25 @@
+import '../../domain/entities/promo_code_result.dart';
+
+class PromoCodeResponseDto {
+  final bool success;
+  final double balance;
+
+  PromoCodeResponseDto({
+    required this.success,
+    required this.balance,
+  });
+
+  factory PromoCodeResponseDto.fromJson(Map<String, dynamic> json) {
+    return PromoCodeResponseDto(
+      success: json['success'] as bool,
+      balance: (json['balance'] as num).toDouble(),
+    );
+  }
+
+  PromoCodeResult toEntity() {
+    return PromoCodeResult(
+      success: success,
+      balance: balance,
+    );
+  }
+}

lib/data/network/api_service.dart

@@ -1150,4 +1150,31 @@ class ApiService {
     }
     return null;
   }
+
+  Future<Map<String, dynamic>> applyPromoCode(String code) async {
+    final token = await _securityService.getAccessToken();
+    if (token == null) throw Exception('No access token');
+
+    final response = await _dio.post(
+      '$baseUrl/promocode/apply',
+      data: {'code': code},
+      options: Options(
+        headers: {
+          'Content-Type': 'application/json',
+          'Authorization': 'Bearer $token',
+        },
+      ),
+    );
+
+    if (response.statusCode == 201 || response.statusCode == 200) {
+      return response.data;
+    } else if (response.statusCode == 404) {
+      throw PromoCodeNotFoundException();
+    } else {
+      throw Exception('API Error: ${response.statusCode}');
+    }
+  }
 }
+
+// ✅ Добавь исключение (можно в отдельный файл)
+class PromoCodeNotFoundException implements Exception {}

lib/data/repositories/promo_code_repository_impl.dart

@@ -0,0 +1,23 @@
+import '../../domain/entities/promo_code_result.dart';
+import '../../domain/repositories/promo_code_repository.dart';
+import '../models/promo_code_response_dto.dart';
+import '../network/api_service.dart';
+
+class PromoCodeRepositoryImpl implements PromoCodeRepository {
+  final ApiService apiService;
+
+  PromoCodeRepositoryImpl(this.apiService);
+
+  @override
+  Future<PromoCodeResult> applyPromoCode(String code) async {
+    try {
+      final data = await apiService.applyPromoCode(code);
+      final dto = PromoCodeResponseDto.fromJson(data);
+      return dto.toEntity();
+    } on PromoCodeNotFoundException {
+      throw Exception('Промокод не найден');
+    } catch (e) {
+      throw Exception('Ошибка активации промокода: $e');
+    }
+  }
+}