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BlazorWebAssemblyVisaApiClient/Validation/Applicants/Models/MaritalStatusModel.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models
+{
+    public enum MaritalStatusModel
+    {
+        Other = 0,
+
+        Married = 1,
+
+        Unmarried = 2,
+
+        Separated = 3,
+
+        [Display(Name = "Widow or widower")]
+        WidowOrWidower = 4
+    }
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Models/PlaceOfWorkModel.cs

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+using System.ComponentModel.DataAnnotations;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models;
+
+/// Model of place of work with attributes required for validation to work
+public class PlaceOfWorkModel
+{
+    [Required]
+    [StringLength(ConfigurationConstraints.PlaceOfWorkNameLength, MinimumLength = 1)]
+    public string Name { get; set; } = default!;
+
+    [Required]
+    [ValidateComplexType]
+    public AddressModel Address { get; set; } = new AddressModel();
+
+    [Required]
+    [StringLength(ConfigurationConstraints.PhoneNumberLength, MinimumLength = ConfigurationConstraints.PhoneNumberMinLength)]
+    public string PhoneNum { get; set; } = default!;
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Models/RegisterApplicantRequestModel.cs

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+using System.ComponentModel.DataAnnotations;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Converters;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models;
+
+/// Model of request with attributes required for validation to work
+public class RegisterApplicantRequestModel
+{
+    [Required]
+    [ValidateComplexType]
+    public RegisterRequestModel RegisterRequest { get; set; } = new();
+
+    [Required]
+    [ValidateComplexType]
+    public NameModel ApplicantName { get; set; } = new();
+
+    [Required]
+    [ValidateComplexType]
+    public PassportModel Passport { get; set; } = new();
+
+    [Required(AllowEmptyStrings = true)]
+    public DateTimeOffset BirthDate { get; set; }
+
+    [Required]
+    [StringLength(70, MinimumLength = 1)]
+    public string CityOfBirth { get; set; } = default!;
+
+    [Required]
+    [StringLength(70, MinimumLength = 1)]
+    public string CountryOfBirth { get; set; } = default!;
+
+    [Required]
+    [StringLength(30, MinimumLength = 1)]
+    public string Citizenship { get; set; } = default!;
+
+    [Required]
+    [StringLength(30, MinimumLength = 1)]
+    public string CitizenshipByBirth { get; set; } = default!;
+
+    [Required(AllowEmptyStrings = true)]
+    [JsonConverter(typeof(StringEnumConverter))]
+    public Gender Gender { get; set; }
+
+    [Required(AllowEmptyStrings = true)]
+    [JsonConverter(typeof(StringEnumConverter))]
+    public MaritalStatusModel MaritalStatus { get; set; }
+
+    [Required]
+    [ValidateComplexType]
+    public NameModel FatherName { get; set; } = new();
+
+    [Required]
+    [ValidateComplexType]
+    public NameModel MotherName { get; set; } = new();
+
+    [Required]
+    [StringLength(50, MinimumLength = 1)]
+    public string JobTitle { get; set; } = default!;
+
+    [Required]
+    [ValidateComplexType]
+    public PlaceOfWorkModel PlaceOfWork { get; set; } = new();
+
+    public bool IsNonResident { get; set; }
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Models/RegisterRequestModel.cs

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+using System.ComponentModel.DataAnnotations;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models;
+
+/// Model of request with attributes required for validation to work
+public class RegisterRequestModel
+{
+    [Required]
+    [ValidateComplexType]
+    public AuthData AuthData { get; set; } = new AuthData();
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Validators/NameModelValidator.cs

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+using FluentValidation;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Validators;
+
+public class NameModelValidator : AbstractValidator<NameModel>
+{
+    public NameModelValidator()
+    {
+        RuleFor(m => m.FirstName)
+            .NotEmpty()
+            .WithMessage("First Name can not be empty")
+            .Matches(Constants.EnglishWordRegex)
+            .WithMessage("First name must be in english characters")
+            .MaximumLength(ConfigurationConstraints.NameLength)
+            .WithMessage($"First Name length must be less than {ConfigurationConstraints.NameLength}");
+
+        RuleFor(m => m.Surname)
+            .NotEmpty()
+            .WithMessage("Surname can not be empty")
+            .Matches(Constants.EnglishWordRegex)
+            .WithMessage("Surname must be in english characters")
+            .MaximumLength(ConfigurationConstraints.NameLength)
+            .WithMessage($"Surname length must be less than {ConfigurationConstraints.NameLength}");
+
+        RuleFor(m => m.Patronymic)
+            .Matches(Constants.EnglishWordRegex)
+            .WithMessage("Patronymic must be in english characters")
+            .MaximumLength(ConfigurationConstraints.NameLength)
+            .WithMessage($"Patronymic length must be less than {ConfigurationConstraints.NameLength}");
+    }
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Validators/PassportModelValidator.cs

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+using BlazorWebAssemblyVisaApiClient.Infrastructure.Services.DateTimeProvider;
+using FluentValidation;
+using VisaApiClient;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Validators;
+
+public class PassportModelValidator : AbstractValidator<PassportModel>
+{
+    public PassportModelValidator(IDateTimeProvider dateTimeProvider)
+    {
+        RuleFor(r => r.Issuer)
+            .NotEmpty()
+            .WithMessage("Passport issuer can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Passport issuer field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.IssuerNameLength)
+            .WithMessage($"Passport issuer length must be less than {ConfigurationConstraints.IssuerNameLength}");
+
+        RuleFor(r => r.Number)
+            .NotEmpty()
+            .WithMessage("Passport number can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Passport number field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.PassportNumberLength)
+            .WithMessage($"Passport number length must be less than {ConfigurationConstraints.PassportNumberLength}");
+
+        RuleFor(r => r.ExpirationDate)
+            .NotEmpty()
+            .WithMessage("Passport expiration date can not be empty")
+            .GreaterThan(dateTimeProvider.Now())
+            .WithMessage("Can not approve visa for applicants with expired passport");
+
+        RuleFor(r => r.IssueDate)
+            .NotEmpty()
+            .WithMessage("Passport issue date can not be empty")
+            .LessThanOrEqualTo(dateTimeProvider.Now())
+            .WithMessage("Passport issue date must be in past");
+    }
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Validators/PlaceOfWorkModelValidator.cs

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+using BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models;
+using FluentValidation;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Validators;
+
+public class PlaceOfWorkModelValidator : AbstractValidator<PlaceOfWorkModel>
+{
+    public PlaceOfWorkModelValidator()
+    {
+        RuleFor(p => p.Name)
+            .NotEmpty()
+            .WithMessage("Place of work name can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Place of work name field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.PlaceOfWorkNameLength)
+            .WithMessage($"Place of work name length must be less than {ConfigurationConstraints.PlaceOfWorkNameLength}");
+
+        RuleFor(p => p.PhoneNum)
+            .NotEmpty()
+            .WithMessage("Place of work phone number can not be empty")
+            .Matches(Constants.PhoneNumRegex)
+            .WithMessage("Place of work phone number field must be valid")
+            .MaximumLength(ConfigurationConstraints.PhoneNumberLength)
+            .WithMessage(
+                $"Phone number length must be in range from {ConfigurationConstraints.PhoneNumberMinLength} to {ConfigurationConstraints.PhoneNumberLength}")
+            .MinimumLength(ConfigurationConstraints.PhoneNumberMinLength)
+            .WithMessage(
+                $"Phone number length must be in range from {ConfigurationConstraints.PhoneNumberMinLength} to {ConfigurationConstraints.PhoneNumberLength}");
+
+        RuleFor(p => p.Address)
+            .NotEmpty()
+            .WithMessage("Place of work address can not be empty");
+
+        RuleFor(p => p.Address.Country)
+            .NotEmpty()
+            .WithMessage("Country name of place of work can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Place of work Country field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CountryNameLength)
+            .WithMessage($"Country name of place of work length must be less than {ConfigurationConstraints.CountryNameLength}");
+
+        RuleFor(p => p.Address.City)
+            .NotEmpty()
+            .WithMessage("City name of place of work can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Place of work City field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CityNameLength)
+            .WithMessage($"City name of place of work length must be less than {ConfigurationConstraints.CityNameLength}");
+
+        RuleFor(p => p.Address.Street)
+            .NotEmpty()
+            .WithMessage("Street name of place of work can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Place of work Street field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.StreetNameLength)
+            .WithMessage($"Street name of place of work length must be less than {ConfigurationConstraints.StreetNameLength}");
+
+        RuleFor(p => p.Address.Building)
+            .NotEmpty()
+            .WithMessage("Building of place of work can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Place of work building field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CountryNameLength)
+            .WithMessage($"Building of place of work length must be less than {ConfigurationConstraints.BuildingNumberLength}");
+    }
+}

BlazorWebAssemblyVisaApiClient/Validation/Applicants/Validators/RegisterApplicantRequestValidator.cs

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+using BlazorWebAssemblyVisaApiClient.Infrastructure.Services.DateTimeProvider;
+using BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models;
+using FluentValidation;
+using VisaApiClient;
+using PlaceOfWorkModel = BlazorWebAssemblyVisaApiClient.Validation.Applicants.Models.PlaceOfWorkModel;
+
+namespace BlazorWebAssemblyVisaApiClient.Validation.Applicants.Validators;
+
+public class RegisterApplicantRequestValidator : AbstractValidator<RegisterApplicantRequestModel>
+{
+    public RegisterApplicantRequestValidator(
+        IDateTimeProvider dateTimeProvider,
+        IValidator<NameModel> nameValidator,
+        IValidator<RegisterRequestModel> registerRequestValidator,
+        IValidator<PassportModel> passportValidator,
+        IValidator<PlaceOfWorkModel> placeOfWorkModelValidator)
+    {
+        RuleFor(r => r.RegisterRequest)
+            .NotEmpty()
+            .SetValidator(registerRequestValidator);
+
+        RuleFor(r => r.ApplicantName)
+            .NotEmpty()
+            .SetValidator(nameValidator);
+
+        RuleFor(r => r.FatherName)
+            .NotEmpty()
+            .SetValidator(nameValidator);
+
+        RuleFor(r => r.MotherName)
+            .NotEmpty()
+            .SetValidator(nameValidator);
+
+        RuleFor(r => r.Passport)
+            .NotEmpty()
+            .SetValidator(passportValidator);
+
+        RuleFor(r => r.BirthDate)
+            .NotEmpty()
+            .WithMessage("Birth date can not be empty")
+            .LessThanOrEqualTo(dateTimeProvider.Now().AddYears(-ConfigurationConstraints.ApplicantMinAge))
+            .WithMessage($"Applicant must be older than {ConfigurationConstraints.ApplicantMinAge}");
+
+        RuleFor(r => r.CountryOfBirth)
+            .NotEmpty()
+            .WithMessage("Country of birth can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Country of birth field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CountryNameLength)
+            .WithMessage($"Country of birth name length must be less than {ConfigurationConstraints.CountryNameLength}");
+
+        RuleFor(r => r.CityOfBirth)
+            .NotEmpty()
+            .WithMessage("City of birth can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("City of birth field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CityNameLength)
+            .WithMessage($"City of birth name length must be less than {ConfigurationConstraints.CityNameLength}");
+
+        RuleFor(r => r.Citizenship)
+            .NotEmpty()
+            .WithMessage("Citizenship can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Citizenship field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CitizenshipLength)
+            .WithMessage($"Citizenship length must be less than {ConfigurationConstraints.CitizenshipLength}");
+
+        RuleFor(r => r.CitizenshipByBirth)
+            .NotEmpty()
+            .WithMessage("Citizenship by birth can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Citizenship by birth field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.CitizenshipLength)
+            .WithMessage($"Citizenship by birth length must be less than {ConfigurationConstraints.CitizenshipLength}");
+
+        RuleFor(r => r.Gender)
+            .IsInEnum();
+
+        RuleFor(r => r.MaritalStatus)
+            .IsInEnum();
+
+        RuleFor(r => r.JobTitle)
+            .NotEmpty()
+            .WithMessage("Title of job can not be empty")
+            .Matches(Constants.EnglishPhraseRegex)
+            .WithMessage("Title of job field can contain only english letters, digits and special symbols")
+            .MaximumLength(ConfigurationConstraints.JobTitleLength)
+            .WithMessage($"Title of job length must be less than {ConfigurationConstraints.JobTitleLength}");
+
+        RuleFor(r => r.PlaceOfWork)
+            .NotEmpty()
+            .SetValidator(placeOfWorkModelValidator);
+    }
+}