public IActionResult SubOnCourse([FromBody] SubscriptionUserDTO model)
 {
     if (!ModelState.IsValid)
     {
         return(BadRequest("Please, enter all field correct"));
     }
     else
     {
         CommandService.SubscriptionStudent(model);
         return(Ok("The student has successfully signed on course"));
     }
 }
        public void SubscriptionStudent(SubscriptionUserDTO dto)
        {
            Context.UserSubscriptions.Add(new UserSubscriptions
            {
                CourseId  = dto.CourseId,
                StartDate = dto.StartDate,
                UserId    = dto.UserId
            });

            Context.Users.FirstOrDefault(t => t.Id == dto.UserId).StudyDate = dto.StartDate.ToShortDateString();

            var student = Context.Users.FirstOrDefault(t => t.Id == dto.UserId);

            if (student != null)
            {
                var currentDate = DateTime.UtcNow;
                if (dto.StartDate > currentDate)
                {
                    EmailService emailServive  = new EmailService();
                    Days         daysConstants = new Days(dto.StartDate);

                    var job30days = BackgroundJob.Schedule(
                        () => emailServive.SendEmailAsync(student.Email, "Confirm password on HONEY COURSES", $"Good day.\n {student.Name} {student.LastName} you start training in course in month. See you at training."),
                        daysConstants.ThirtyDays);

                    var job7days = BackgroundJob.Schedule(
                        () => emailServive.SendEmailAsync(student.Email, "Confirm password on HONEY COURSES", $"Good day.\n {student.Name} {student.LastName} you start training in course in 1 week. See you at training."),
                        daysConstants.SevenDay);

                    var job1days = BackgroundJob.Schedule(
                        () => emailServive.SendEmailAsync(student.Email, "Confirm password on HONEY COURSES", $"Good day.\n {student.Name} {student.LastName} you start training in course in 1 day. See you at training."),
                        daysConstants.OneDays);
                }
            }

            Context.SaveChanges();
        }