Changed exceptions, added action for closing applications by applicant

SchengenVisaApi/ApplicationLayer/Services/VisaApplications/Handlers/IVisaApplicationRequestsHandler.cs

@@ -14,4 +14,7 @@ public interface IVisaApplicationRequestsHandler
 
     /// Creates application for applicant with specific user identifier
     Task HandleCreateRequest(Guid userId, VisaApplicationCreateRequest request, CancellationToken cancellationToken);
+
+    /// Sets application status to closed
+    Task HandleCloseRequest(Guid userId, Guid applicationId, CancellationToken cancellationToken);
 }

SchengenVisaApi/ApplicationLayer/Services/VisaApplications/Handlers/VisaApplicationRequestsHandler.cs

@@ -114,4 +114,15 @@ public class VisaApplicationRequestsHandler(
 
         await unitOfWork.SaveAsync(cancellationToken);
     }
+
+    async Task IVisaApplicationRequestsHandler.HandleCloseRequest(Guid userId, Guid applicationId, CancellationToken cancellationToken)
+    {
+        var applicantId = await applicants.GetApplicantIdByUserId(userId, cancellationToken);
+        var application = await applications.GetByApplicantAndApplicationIdAsync(applicantId, applicationId, cancellationToken);
+
+        application.Status = ApplicationStatus.Closed;
+        await applications.UpdateAsync(application, cancellationToken);
+
+        await unitOfWork.SaveAsync(cancellationToken);
+    }
 }

SchengenVisaApi/ApplicationLayer/Services/VisaApplications/NeededServices/IVisaApplicationsRepository.cs

@@ -7,4 +7,7 @@ public interface IVisaApplicationsRepository : IGenericRepository<VisaApplicatio
 {
     /// Get applications of one applicant
     Task<List<VisaApplication>> GetOfApplicantAsync(Guid applicantId, CancellationToken cancellationToken);
+
+    /// Get specific application of specific user
+    Task<VisaApplication> GetByApplicantAndApplicationIdAsync(Guid applicantId, Guid applicationId, CancellationToken cancellationToken);
 }