presence_new/domain/UseCase/AdminUseCase.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.X509Certificates;
using System.Threading.Tasks;
using data.Repository;
using domain.Models.ResponseModels;
using presence.data.RemoteData.RemoteDataBase.DAO;
using presence.data.Repository;

namespace domain.UseCase
{
    public class AdminUseCase
    {
        private readonly IAdminRepository _adminRepository;
        private readonly IGroupRepository _groupRepository;


        public AdminUseCase(IAdminRepository adminRepository, IGroupRepository groupRepository)
        {
            _adminRepository = adminRepository;
            _groupRepository = groupRepository;
        }

        public IEnumerable<GroupResponse> GetAllGroupsWithStudents() => 
            _adminRepository.GetAllGroupsWithStudents().Select(it => new GroupResponse 
                {
                    Name = it.Name, 
                    Id = it.Id,
                    User = it.User.Where(u => u.GroupId == it.Id)
                        .Select(u => new UserResponse { Id = u.UserId, FIO = u.FIO })
                        .ToList()
                })
                .ToList();
        
        public UserResponse GetStudentInfo(int userId) 
        {

            var studentInfo = _adminRepository.GetStudentInfo(userId);
            if (studentInfo == null) return null;
            
            UserResponse user= new UserResponse{
                Id = userId,
                FIO = _adminRepository.GetStudentInfo(userId).FIO,
                GroupId = _adminRepository.GetStudentInfo(userId).GroupId
            };
            return user;
        }

        public bool AddStudents(string GroupName, List<string> Students)
        {
            GroupDao groupDao= new GroupDao{ Name = GroupName};
            List<UserDao> users = new List<UserDao>();
            foreach (string student in Students)
            {
                var user = new UserDao
                {
                    FIO = student,
                    Group = groupDao
                };
                users.Add(user);
            }
            return _adminRepository.AddStudents(groupDao, users);
        }

        public bool DeleteGroup(int groupId) => _groupRepository.RemoveGroupById(groupId);

        public bool DeleteUserFromGroup(int userId, int groupId) => _adminRepository.RemoveUserById(userId, groupId);

    }
}