Registration and actions for approving authorities

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

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