presence/Demo/Domain/UseCase/UserUseCase.cs

using Demo.Data.Repository;
using Demo.Domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;

namespace Demo.Domain.UseCase
{
    public class UserUseCase
    {
        private readonly UserRepositoryImpl _userRepository;
        private readonly GroupRepositoryImpl _groupRepo;

        public UserUseCase(UserRepositoryImpl userRepository, GroupRepositoryImpl groupRepo)
        {
            _userRepository = userRepository;
            _groupRepo = groupRepo;
        }

        public List<User> GetAllUsers()
        {
            return _userRepository.GetAllUsers();
        }

        public User FindUserByGuid(Guid userGuid)
        {
            return _userRepository.GetByGuid(userGuid);
        }

        public List<UserModel> GetUsersAsModels()
        {
            return _userRepository.GetAllUsers()
                .Select(user => new UserModel
                {
                    FIO = user.FIO,
                    Guid = user.Guid,
                }).ToList();
        }

        public UserModel GetUserModelById(Guid id)
        {
            var user = _userRepository.GetByGuid(id);
            return new UserModel
            {
                FIO = user?.FIO, // Проверка на null
                Guid = user?.Guid ?? Guid.Empty, // Возврат Guid.Empty, если user null
            };
        }

        public bool RemoveUserByGuid(Guid userGuid)
        {
            return _userRepository.RemoveUserByGuid(userGuid);
        }

        public UserModel GetUserModelByGuid(Guid userGuid)
        {
            var user = FindUserByGuid(userGuid);
            return new UserModel
            {
                FIO = user?.FIO, // Проверка на null
                Guid = user?.Guid ?? Guid.Empty, // Возврат Guid.Empty, если user null
            };
        }

        public bool UpdateUser(User user)
        {
            return _userRepository.UpdateUser(user);
        }

        public Group GetGroupById(int id)
        {
            return _groupRepo.GetGroupById(id);
        }

        internal bool RemoveUser(Guid userGuid)
        {
            throw new NotImplementedException();
        }
    }

    public class UserModel
    {
        public string FIO { get; set; }
        public Guid Guid { get; internal set; }
    }
}