Вытащил солюшен на уровень выше, чтобы прощё было дотнетить

ApplicationLayer/Services/VisaApplications/Models/AuthorityRequestStatuses.cs

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+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+public enum AuthorityRequestStatuses
+{
+    Approved,
+    Rejected
+}

ApplicationLayer/Services/VisaApplications/Models/PastVisaModel.cs

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+using System.ComponentModel.DataAnnotations;
+using Domains;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of past visa for presentation layer
+public class PastVisaModel
+{
+    // Date of issue
+    [Required]
+    public DateTime IssueDate { get; set; }
+
+    /// Name of visa
+    [MaxLength(ConfigurationConstraints.VisaNameLength)]
+    [Required]
+    public string Name { get; set; } = null!;
+
+    /// Date when visa expires
+    [Required]
+    public DateTime ExpirationDate { get; set; }
+}

ApplicationLayer/Services/VisaApplications/Models/PastVisitModel.cs

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+using System.ComponentModel.DataAnnotations;
+using Domains;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of past visit for presentation layer
+public class PastVisitModel
+{
+    /// First day of past visit
+    [Required]
+    public DateTime StartDate { get; set; }
+
+    /// Last day of past visit
+    [Required]
+    public DateTime EndDate { get; set; }
+
+    /// Destination country of past visit
+    [MaxLength(ConfigurationConstraints.CountryNameLength)]
+    [Required]
+    public string DestinationCountry { get; set; } = null!;
+}

ApplicationLayer/Services/VisaApplications/Models/PermissionToDestCountryModel.cs

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+using System.ComponentModel.DataAnnotations;
+using Domains;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of permission to destination country for presentation layer
+public class PermissionToDestCountryModel
+{
+    /// Date when permission to destination country expires
+    [Required]
+    public DateTime ExpirationDate { get; set; }
+
+    /// Issuing authority
+    [MaxLength(ConfigurationConstraints.IssuerNameLength)]
+    [Required]
+    public string Issuer { get; set; } = null!;
+}

ApplicationLayer/Services/VisaApplications/Models/ReentryPermitModel.cs

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+using System.ComponentModel.DataAnnotations;
+using Domains;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of re-entry permit for presentation layer
+public class ReentryPermitModel
+{
+    /// Number of re-entry permit
+    [MaxLength(ConfigurationConstraints.ReentryPermitNumberLength)]
+    [Required]
+    public string Number { get; set; } = null!;
+
+    /// Date when re-entry permit expires
+    [Required]
+    public DateTime ExpirationDate { get; set; }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/PastVisaModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PastVisaModelValidator : AbstractValidator<PastVisaModel>
+{
+    public PastVisaModelValidator(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")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Name of past visa can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.VisaNameLength)
+            .WithMessage($"Past visa name length must be less than {ConfigurationConstraints.VisaNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/PastVisitModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PastVisitModelValidator : AbstractValidator<PastVisitModel>
+{
+    public PastVisitModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(v => v.StartDate)
+            .NotEmpty()
+            .WithMessage("Start date of past visit can not be empty")
+            .LessThan(v => v.EndDate)
+            .WithMessage("Start date of past visit must be earlier than end date")
+            .LessThan(dateTimeProvider.Now())
+            .WithMessage("Start date of past visit must be in past");
+
+        RuleFor(v => v.EndDate)
+            .NotEmpty()
+            .WithMessage("End date of past visit can not be empty");
+
+        RuleFor(v => v.DestinationCountry)
+            .NotEmpty()
+            .WithMessage("Destination Country of past visit can not be null")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Destination Country of past visit can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CountryNameLength)
+            .WithMessage($"Destination Country of past visit length must be less than {ConfigurationConstraints.CountryNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/PermissionToDestCountryModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class PermissionToDestCountryModelValidator : AbstractValidator<PermissionToDestCountryModel?>
+{
+    public PermissionToDestCountryModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(p => p!.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Expiration date of permission to destination Country can not be empty")
+            .GreaterThan(dateTimeProvider.Now())
+            .WithMessage("Permission to destination Country must not be expired");
+
+        RuleFor(p => p!.Issuer)
+            .NotEmpty()
+            .WithMessage("Issuer of permission for destination Country can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Issuer of permission for destination Country can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.IssuerNameLength)
+            .WithMessage($"Issuer of permission to destination Country length must be less than {ConfigurationConstraints.IssuerNameLength}");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/Validation/ReentryPermitModelValidator.cs

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+using ApplicationLayer.InfrastructureServicesInterfaces;
+using Domains;
+using FluentValidation;
+
+namespace ApplicationLayer.Services.VisaApplications.Models.Validation;
+
+public class ReentryPermitModelValidator : AbstractValidator<ReentryPermitModel?>
+{
+    public ReentryPermitModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(p => p!.Number)
+            .NotEmpty()
+            .WithMessage("Re-entry permit number can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Re-entry permit number can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.ReentryPermitNumberLength)
+            .WithMessage($"Re-entry permit number length must be less than {ConfigurationConstraints.ReentryPermitNumberLength}");
+
+        RuleFor(p => p!.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Re-entry permit expiration date can not be empty")
+            .GreaterThan(dateTimeProvider.Now())
+            .WithMessage("Re-entry permit must not be expired");
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/VisaApplicationModel.cs

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+using System.ComponentModel.DataAnnotations;
+using System.Text;
+using ApplicationLayer.Services.Applicants.Models;
+using Domains.VisaApplicationDomain;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of <see cref="VisaApplication" /> with applicant property
+public class VisaApplicationModel
+{
+    /// <inheritdoc cref="VisaApplication.Id" />
+    [Required]
+    public Guid Id { get; set; }
+
+    /// Applicant of application
+    [Required]
+    public ApplicantModel Applicant { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.Status" />
+    [Required]
+    public ApplicationStatus Status { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ReentryPermit" />
+    public ReentryPermitModel? ReentryPermit { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.DestinationCountry" />
+    [Required]
+    public string DestinationCountry { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.PastVisas" />
+    [Required]
+    public List<PastVisaModel> PastVisas { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.PermissionToDestCountry" />
+    public PermissionToDestCountryModel? PermissionToDestCountry { get; set; }
+
+    [Required] public List<PastVisitModel> PastVisits { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.VisaCategory" />
+    [Required]
+    public VisaCategory VisaCategory { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ForGroup" />
+    [Required]
+    public bool ForGroup { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.RequestedNumberOfEntries" />
+    [Required]
+    public RequestedNumberOfEntries RequestedNumberOfEntries { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.RequestDate" />
+    [Required]
+    public DateTime RequestDate { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ValidDaysRequested" />
+    [Required]
+    public int ValidDaysRequested { get; set; }
+
+    public string ForGroupToString() => ForGroup ? "For group" : "Individual";
+
+    public string PastVisasToString()
+    {
+        var stringBuilder = new StringBuilder();
+        foreach (var visa in PastVisas)
+        {
+            stringBuilder.AppendLine($"{visa.Name} issued at {visa.IssueDate.ToShortDateString()} and valid for {visa.ExpirationDate.ToShortDateString()}");
+        }
+
+        return stringBuilder.ToString();
+    }
+
+    public string PastVisitsToString()
+    {
+        var stringBuilder = new StringBuilder();
+        foreach (var visit in PastVisits)
+        {
+            stringBuilder.AppendLine($"Visit to {visit.DestinationCountry} started at {visit.StartDate.ToShortDateString()} and ends {visit.EndDate.ToShortDateString()}");
+        }
+
+        return stringBuilder.ToString();
+    }
+
+    public string PermissionToDestCountryToString()
+    {
+        return VisaCategory is VisaCategory.Transit
+            ? $"Issued by{PermissionToDestCountry!.Issuer}, expires at {PermissionToDestCountry.ExpirationDate.ToShortDateString()}"
+            : "Non-transit";
+    }
+}

ApplicationLayer/Services/VisaApplications/Models/VisaApplicationPreview.cs

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+using System.ComponentModel.DataAnnotations;
+using Domains.VisaApplicationDomain;
+
+namespace ApplicationLayer.Services.VisaApplications.Models;
+
+/// Model of <see cref="VisaApplication" />
+public class VisaApplicationPreview
+{
+    /// <inheritdoc cref="VisaApplication.Id" />
+    [Required]
+    public Guid Id { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.Status" />
+    [Required]
+    public ApplicationStatus Status { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.DestinationCountry" />
+    [Required]
+    public string DestinationCountry { get; set; } = null!;
+
+    /// <inheritdoc cref="VisaApplication.VisaCategory" />
+    [Required]
+    public VisaCategory VisaCategory { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.RequestDate" />
+    [Required]
+    public DateTime RequestDate { get; set; }
+
+    /// <inheritdoc cref="VisaApplication.ValidDaysRequested" />
+    [Required]
+    public int ValidDaysRequested { get; set; }
+}