사용하지 않는 파일 정리 전 백업 (Phase 10 완료 후 상태)

lib/domain/usecases/company/update_parent_company_usecase.dart

@@ -0,0 +1,110 @@
+import 'package:dartz/dartz.dart';
+import '../../../core/errors/failures.dart';
+import '../../../core/utils/hierarchy_validator.dart';
+import '../../../models/company_model.dart';
+import '../../../services/company_service.dart';
+import '../base_usecase.dart';
+import '../../../data/models/company/company_dto.dart';
+
+/// 부모 회사 변경 파라미터
+class UpdateParentCompanyParams {
+  final int companyId;
+  final int? newParentId;
+
+  const UpdateParentCompanyParams({
+    required this.companyId,
+    required this.newParentId,
+  });
+}
+
+/// 부모 회사 변경 UseCase
+class UpdateParentCompanyUseCase extends UseCase<Company, UpdateParentCompanyParams> {
+  final CompanyService _companyService;
+
+  UpdateParentCompanyUseCase(this._companyService);
+
+  @override
+  Future<Either<Failure, Company>> call(UpdateParentCompanyParams params) async {
+    try {
+      // 1. 모든 회사 조회 (검증용)
+      final response = await _companyService.getCompanies(
+        page: 1,
+        perPage: 1000,
+      );
+      
+      // CompanyDto 리스트로 변환 (검증용)
+      final companyResponses = response.items.map((company) => CompanyDto(
+        id: company.id ?? 0,
+        name: company.name,
+        address: company.address.toString(),
+        contactName: company.contactName ?? '',
+        contactPhone: company.contactPhone ?? '',
+        contactEmail: company.contactEmail ?? '',
+        isActive: true,
+        parentCompanyId: company.parentCompanyId,
+        registeredAt: DateTime.now(),
+      )).toList();
+      
+      // 2. 순환 참조 검증
+      final circularValidation = HierarchyValidator.validateCircularReference(
+        companyId: params.companyId,
+        newParentId: params.newParentId,
+        allCompanies: companyResponses,
+      );
+      
+      if (!circularValidation.isValid) {
+        return Left(ValidationFailure(
+          message: circularValidation.message,
+        ));
+      }
+      
+      // 3. 계층 깊이 검증
+      final depthValidation = HierarchyValidator.validateDepth(
+        parentId: params.newParentId,
+        allCompanies: companyResponses,
+      );
+      
+      if (!depthValidation.isValid) {
+        return Left(ValidationFailure(
+          message: depthValidation.message,
+        ));
+      }
+      
+      // 4. 부모 변경 가능 여부 전체 검증
+      final changeValidation = HierarchyValidator.validateParentChange(
+        companyId: params.companyId,
+        newParentId: params.newParentId,
+        allCompanies: companyResponses,
+      );
+      
+      if (!changeValidation.isValid) {
+        return Left(ValidationFailure(
+          message: changeValidation.message,
+        ));
+      }
+      
+      // 5. 현재 회사 정보 조회
+      final currentCompany = await _companyService.getCompanyDetail(params.companyId);
+      
+      // 6. 부모 회사 ID만 변경
+      final updatedCompany = currentCompany.copyWith(
+        parentCompanyId: params.newParentId,
+      );
+      
+      // 7. 업데이트 실행
+      final result = await _companyService.updateCompany(params.companyId, updatedCompany);
+      
+      return Right(result);
+    } on ServerFailure catch (e) {
+      return Left(ServerFailure(
+        message: e.message,
+        originalError: e,
+      ));
+    } catch (e) {
+      return Left(UnknownFailure(
+        message: '부모 회사 변경 중 오류가 발생했습니다.',
+        originalError: e,
+      ));
+    }
+  }
+}