Demo/Data/Repository/UserRepositoryImpl.cs

using Data.RemoteData.RemoteDataBase.DAO;
using Demo.Data.LocalData;
using Demo.domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Demo.Data.Repository
{
    public class SQLUserRepositoryImpl:IUserRepository
    {

        private readonly RemoteDatabaseContext _remoteDatabaseContext;
        
        public SQLUserRepositoryImpl(RemoteDatabaseContext remoteDatabaseContext) {
            _remoteDatabaseContext = remoteDatabaseContext;
            GetAllUsers = _remoteDatabaseContext.Users.Select(x => new UserLocalEntity{FIO = x.FIO, Guid = x.Guid, GroupID = x.GroupID}).ToList();
        }
        public List<UserLocalEntity> GetAllUsers
        { get; set; }

        public List<UserLocalEntity> GetAllUser()
        {
            return _remoteDatabaseContext.Users.Select(x => new UserLocalEntity{FIO = x.FIO, Guid = x.Guid, GroupID = x.GroupID}).ToList();
        }

        public bool RemoveUserByGuid(Guid userGuid)
        {
            var userDAO = _remoteDatabaseContext.Users.FirstOrDefault(x => x.Guid == userGuid);
            _remoteDatabaseContext.Users.Remove(userDAO);
            _remoteDatabaseContext.SaveChanges();
            return true;
        }

        public UserLocalEntity? GetUserByGuid(Guid userGuid) {
            var userDAO = _remoteDatabaseContext.Users.FirstOrDefault(x => x.Guid == userGuid);
            return new UserLocalEntity{FIO = userDAO.FIO,  GroupID = userDAO.GroupID, Guid = userGuid};
        }

        public UserLocalEntity? UpdateUser(UserLocalEntity userUpdateLocalEntity) {
            var user = _remoteDatabaseContext.Users.FirstOrDefault(x => x.Guid == userUpdateLocalEntity.Guid);
            if (user == null){
                return null;
            }

            user.FIO = userUpdateLocalEntity.FIO;
            user.GroupID = userUpdateLocalEntity.GroupID;
            _remoteDatabaseContext.SaveChanges();
            return new UserLocalEntity{FIO = user.FIO, Guid = user.Guid, GroupID = user.GroupID};
        }
    }
}