presence/domain/Service/PresenceService.cs

using data.Repository;
using domain.Entity;
using domain.UseCase;
using System;
using System.Collections.Generic;

namespace domain.Service
{
    public class PresenceService : IPresenceUseCase
    {
        private readonly IPresenceRepository _presenceRepository;

        public PresenceService(IPresenceRepository presenceRepository)
        {
            _presenceRepository = presenceRepository;
        }

        public IEnumerable<PresenceEntity> GetPresence(
            int groupId,
            int? subjectId = null,
            DateTime? date = null,
            int? studentId = null)
        {
            return _presenceRepository.GetPresence(groupId, subjectId, date, studentId).Select(p => new PresenceEntity
            {
                Id = p.Id,
                StudentId = p.Student.Id,
                Student = new UserEntity
                {
                    Id = p.Student.Id,
                    FirstName = p.Student.FirstName,
                    LastName = p.Student.LastName,
                    Patronymic = p.Student.Patronymic,
                    Group = new GroupEntity()
                },
                SubjectId = p.StudentGroupSubject.Subject.Id,
                Subject = new SubjectEntity
                {
                    Id = p.StudentGroupSubject.Subject.Id,
                    Name = p.StudentGroupSubject.Subject.Name
                },
                Date = p.Date
            });
        }
    }
}