semesterWork/domain/Service/GroupService.cs

using data.DAO;
using data.Repository;
using domain.Entity;
using domain.Request;
using domain.UseCase;
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 data.DAO.GroupDAO { Name = addGroupRequest.Name });
        }

        public void AddGroupWithStudents(AddGroupWithStudentsRequest addGroupWithStudents)
        {
            GroupDAO groupDAO = new GroupDAO() { Name = addGroupWithStudents.addGroupRequest.Name };
            List<UserDAO> users = addGroupWithStudents.addStudentRequests
                .Select(it => new UserDAO { Name = it.StudentName })
                .ToList();
            _groupRepository.addGroupWithStudents(groupDAO, users);
        }

        public IEnumerable<GroupEntity> GetGroupsWithStudents()
        {
            return _groupRepository.getAllGroup().Select(
                group => new GroupEntity()
                {
                    Id = group.Id,
                    Name = group.Name,
                    Users = group.Users.Select(
                        user => new UserEntity
                        {
                            Guid = user.Guid,
                            Name = user.Name,
                            Group = new GroupEntity
                            {
                                Id = group.Id,
                                Name = group.Name,
                            }
                        }).ToList()
                }).ToList();
        }

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

            return result.Select(
                group => new GroupEntity
                {
                    Id = group.Id,
                    Name = group.Name,
                    Users = group.Users.Select(
                        user => new UserEntity
                        {
                            Guid = user.Guid,
                            Name = user.Name,
                            Group = new GroupEntity
                            {
                                Id = group.Id,
                                Name = group.Name,
                            }
                        }).ToList()
                }).ToList();
        }
    }
}