Renamed folder

SchengenVisaApi/ApplicationLayer/Services/Locations/NeededServices/ICitiesRepository.cs

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+using ApplicationLayer.GeneralNeededServices;
+using Domains.LocationDomain;
+
+namespace ApplicationLayer.Services.Locations.NeededServices;
+
+public interface ICitiesRepository : IGenericRepository<City>;

SchengenVisaApi/ApplicationLayer/Services/Locations/NeededServices/ICountriesRepository.cs

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+using ApplicationLayer.GeneralNeededServices;
+using Domains.LocationDomain;
+
+namespace ApplicationLayer.Services.Locations.NeededServices;
+
+public interface ICountriesRepository : IGenericRepository<Country>
+{
+    /// Gets country by name
+    /// <param name="countryName">Name of country to seek</param>
+    /// <param name="cancellationToken">Cancellation Token</param>
+    /// <returns>Country or null if not found</returns>
+    Task<Country?> FindByName(string countryName, CancellationToken cancellationToken);
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/AdminRequests/EditLocationsRequestsHandler.cs

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+using ApplicationLayer.GeneralNeededServices;
+using ApplicationLayer.Services.Locations.NeededServices;
+using ApplicationLayer.Services.Locations.RequestHandlers.AdminRequests.Exceptions;
+using ApplicationLayer.Services.Locations.Requests;
+using Domains.LocationDomain;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.AdminRequests
+{
+    /// <inheritdoc cref="IEditLocationsRequestsHandler"/>
+    public class EditLocationsRequestsHandler(ICountriesRepository countries, IUnitOfWork unitOfWork) : IEditLocationsRequestsHandler
+    {
+        async Task IEditLocationsRequestsHandler.AddCountryAsync(AddCountryRequest request, CancellationToken cancellationToken)
+        {
+            if (await countries.FindByName(request.CountryName, cancellationToken) is not null)
+            {
+                throw new CountryAlreadyExists(request.CountryName);
+            }
+
+            if (request.Cities.Distinct().Count() < request.Cities.Length)
+            {
+                throw new MultipleIdenticalCitiesInCountryException();
+            }
+
+            var country = new Country
+            {
+                Name = request.CountryName,
+                IsSchengen = request.IsSchengen,
+                Cities = request.Cities.Select(cityName => new City { Name = cityName }).ToList()
+            };
+
+            await countries.AddAsync(country, cancellationToken);
+
+            await unitOfWork.SaveAsync(cancellationToken);
+        }
+    }
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/AdminRequests/Exceptions/CountryAlreadyExists.cs

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+using ApplicationLayer.GeneralExceptions;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.AdminRequests.Exceptions
+{
+    public class CountryAlreadyExists(string countryName) : AlreadyExistsException($"{countryName} already exists.");
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/AdminRequests/Exceptions/MultipleIdenticalCitiesInCountryException.cs

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+using ApplicationLayer.GeneralExceptions;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.AdminRequests.Exceptions
+{
+    public class MultipleIdenticalCitiesInCountryException() : ApiException("There are multiple cities with one name in the country.");
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/AdminRequests/IEditLocationsRequestsHandler.cs

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+using ApplicationLayer.Services.Locations.Requests;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.AdminRequests
+{
+    /// Handles edit requests of locations from admins
+    public interface IEditLocationsRequestsHandler
+    {
+        /// Handles add country requests
+        Task AddCountryAsync(AddCountryRequest request, CancellationToken cancellationToken);
+    }
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/ApplicantRequests/ILocationRequestsHandler.cs

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+using Domains.LocationDomain;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.ApplicantRequests
+{
+    /// Handles location requests
+    public interface ILocationRequestsHandler
+    {
+        /// Handle get request
+        /// <returns>List of available countries</returns>
+        Task<List<Country>> HandleGetRequestAsync(CancellationToken cancellationToken);
+    }
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/RequestHandlers/ApplicantRequests/LocationRequestsHandler.cs

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+using ApplicationLayer.Services.Locations.NeededServices;
+using Domains.LocationDomain;
+
+namespace ApplicationLayer.Services.Locations.RequestHandlers.ApplicantRequests
+{
+    /// <inheritdoc cref="ILocationRequestsHandler"/>
+    public class LocationRequestsHandler(ICountriesRepository countries) : ILocationRequestsHandler
+    {
+        async Task<List<Country>> ILocationRequestsHandler.HandleGetRequestAsync(CancellationToken cancellationToken)
+        {
+            return await countries.GetAllAsync(cancellationToken);
+        }
+    }
+}

SchengenVisaApi/ApplicationLayer/Services/Locations/Requests/AddCountryRequest.cs

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+namespace ApplicationLayer.Services.Locations.Requests
+{
+    public record AddCountryRequest(string CountryName, bool IsSchengen, string[] Cities);
+}