Added validation and fixed errors

SchengenVisaApi/ApplicationLayer/Services/VisaApplications/Requests/Validation/PastVisaValidator.cs

@@ -0,0 +1,28 @@
+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains.VisaApplicationDomain;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Requests.Validation
+{
+    public class PastVisaValidator : AbstractValidator<PastVisa>
+    {
+        public PastVisaValidator(IDateTimeProvider dateTimeProvider)
+        {
+            RuleFor(v => v.ExpirationDate)
+                .NotEmpty()
+                .WithMessage("Expiration date of past visa can not be empty")
+                .GreaterThan(v => v.IssueDate)
+                .WithMessage("Past visa expiration date can not be earlier than issue date");
+
+            RuleFor(v => v.IssueDate)
+                .NotEmpty()
+                .WithMessage("Issue date of past visa can not be empty")
+                .LessThan(dateTimeProvider.Now())
+                .WithMessage("Issue date of past visa must be in past");
+
+            RuleFor(v => v.Name)
+                .NotEmpty()
+                .WithMessage("Name of past visa can not be empty");
+        }
+    }
+}