presence_new/domain/Services/GroupService.cs

using data.Repository;
using domain.Models.ResponseModels;
using domain.Requests;
using domain.UseCase;
using presence.data.RemoteData.RemoteDataBase.DAO;
using presence.data.Repository;
using presence.domain.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace domain.Service
{
    public class GroupService : IGroupUseCase
    {
        private readonly IGroupRepository _groupRepository;
        public GroupService(IGroupRepository groupRepository)
        {
            _groupRepository = groupRepository;
        }
        public void AddGroup(AddGroupRequest addGroupRequest)
        {
            _groupRepository.AddGroup(new GroupDao { Name = addGroupRequest.Name });
        }



        public void AddGroupWithStudents(AddGroupWithStudentRequest addGroupWithStudents)
        {
            GroupDao groupDAO = new GroupDao { Name = addGroupWithStudents.addGroupRequest.Name };
            List<UserDao> users = addGroupWithStudents
                .AddStudentRequests
                .Select(it => new UserDao { FIO = it.StudentName })
                .ToList();
            _groupRepository.AddStudents(groupDAO, users);
        }

        public async Task<IEnumerable<GroupResponse>> GetGroupsWithStudentsAsync()
        {
            var result = await _groupRepository.getAllGroupAsync();

            return result.Select(
                group => new GroupResponse
                {
                    Id = group.Id,
                    Name = group.Name,
                    User = group.User.Select(
                        user => new UserResponse
                        {
                            Id = user.UserId,
                            FIO = user.FIO,
                            Group = new GroupResponse
                            {
                                Id = group.Id,
                                Name = group.Name,
                            }
                        }).ToList()
                }).ToList();
        }

        public IEnumerable<GroupResponse> GetGroupsWithStudents()
        {
            return _groupRepository.GetAllGroup().Select(
                group => new GroupResponse
                {
                    Id = group.Id,
                    Name = group.Name,
                    User = group.User != null ? group.User.Select(
                        user => new UserResponse
                        {
                            Id = user.UserId,
                            FIO = user.FIO,
                            Group = new GroupResponse
                            {
                                Id = group.Id,
                                Name = group.Name,
                            }
                        }).ToList() : new List<UserResponse>()
                }).ToList();
        }
    }
}