Demo/Domain/UseCase/GroupUseCase.cs

using Demo.Domain.Models;
using Demo.Data.Repository;

namespace Demo.Domain.UseCase
{
    public class GroupUseCase
    {
        private GroupRepositoryImpl _repositoryGroupImpl;
        private UserRepositoryImpl _repositoryUserImpl;
        public GroupUseCase(GroupRepositoryImpl repositoryGroupImpl, UserRepositoryImpl repositoryUserImpl)
        {
            _repositoryGroupImpl = repositoryGroupImpl;
            _repositoryUserImpl = repositoryUserImpl;
        }

        public List<Group> GetAllGroups() => _repositoryGroupImpl.GetAllGroups
        .Select(it => new Group{ID = it.ID, Name = it.Name}).ToList();

        public bool CreateNewGroup(Group group){
            GroupLocalEntity? groupLocalEntity = new GroupLocalEntity{ID = group.ID, Name = group.Name};
            _repositoryGroupImpl.CreateNewGroup(groupLocalEntity);
            if (groupLocalEntity != null) return false;
            return true;
        }

        public Group UpdateGroup(Group group)
        {
            GroupLocalEntity groupLocalEntity = new GroupLocalEntity
            {
                ID = group.ID,
                Name = group.Name
            };
            GroupLocalEntity? result = _repositoryGroupImpl.UpdateGroup(groupLocalEntity);
            if (result == null)
            {
                throw new Exception("Не удалось обновить пользователя: пользователь не найден.");
            }
            return new Group
            {
                ID = result.ID,
                Name = result.Name
            };
        }
    }
}