public ActionResult NewCustomer(int?id)
        {
            NewCustomerViewModel model = new NewCustomerViewModel();

            model.GenderList = EnumHelpers.ConvertEnumToList(typeof(Genders));

            List <string> CountryList = new List <string>();

            CultureInfo[] CInfoList = CultureInfo.GetCultures(CultureTypes.SpecificCultures);
            foreach (CultureInfo CInfo in CInfoList)
            {
                RegionInfo R = new RegionInfo(CInfo.LCID);
                if (!(CountryList.Contains(R.EnglishName)))
                {
                    CountryList.Add(R.EnglishName);
                }
            }

            CountryList.Sort();
            ViewBag.CountryList = CountryList;

            if (id == null)
            {
                model.Customer = new Customers();
            }
            else
            {
                model.Customer = _customersManagement.Get(d => d.ID == id);
                model.BookList = _booksManagement.GetAll(b => b.CustomerID == id && !b.IsCancelled).OrderBy(b => b.ArrivalDate).ToList();
            }

            return(View(model));
        }
        public string NewBooking(HomeViewModel model)
        {
            if (model.Book.ArrivalDate < DateTime.Today)
            {
                return("Arrival Date must be greater than today.");
            }
            else if (model.Book.ArrivalDate > model.Book.DepartureDate)
            {
                return("Departure Date must be greater than Arrival Date.");
            }

            bool available = false;

            model.Book.BookingDate = DateTime.Now;
            var customer = _customersManagement.Get(c => c.Nation == model.Customer.Nation && c.NationalID == model.Customer.NationalID);
            var rooms    = _roomsManagement.GetAll(r => r.RoomTypeID == model.RoomTypeID).ToList();

            if (customer == null)
            {
                Customers newCustomer = model.Customer;
                if (String.IsNullOrEmpty(newCustomer.Email) || String.IsNullOrEmpty(newCustomer.Name))
                {
                    return("Your E-Mail and/or Name is empty. Try again");
                }
                _customersManagement.Add(newCustomer);
                customer = _customersManagement.Get(c => c.Nation == model.Customer.Nation && c.NationalID == model.Customer.NationalID);
            }

            model.Book.CustomerID = customer.ID;
            model.Book.Night      = (int)(model.Book.DepartureDate - model.Book.ArrivalDate).TotalDays;

            if (String.IsNullOrEmpty(customer.Name))
            {
                if (!String.IsNullOrEmpty(model.Customer.Name))
                {
                    customer.Name = model.Customer.Name;
                    _customersManagement.Update(customer);
                }
                else
                {
                    return("Your Name is empty.");
                }
            }
            if (String.IsNullOrEmpty(customer.Email))
            {
                if (!String.IsNullOrEmpty(model.Customer.Email))
                {
                    customer.Email = model.Customer.Email;
                    _customersManagement.Update(customer);
                }
                else
                {
                    return("Your E-Mail is empty.");
                }
            }

            foreach (var room in rooms)
            {
                var books = _booksManagement.GetAll(b => b.RoomID == room.ID).ToList();
                if (books.Count == 0)
                {
                    available = true;
                }
                foreach (var book in books)
                {
                    available = DateHelper.AvailableDate(model.Book.ArrivalDate, model.Book.DepartureDate, book.ArrivalDate, book.DepartureDate);

                    if (!available)
                    {
                        break;
                    }
                }

                if (available)
                {
                    model.Book.RoomID = room.ID;
                    _booksManagement.Add(model.Book);
                    break;
                }
            }

            if (!available)
            {
                return("All rooms are reserved. Please, change room type or date and try again.");
            }

            return(String.Format($"Your booking has been saved!\nRoom No: {_roomsManagement.Get(r=>r.ID == model.Book.RoomID).RoomNo}\nAll details have been sent to {customer.Email}"));
        }