SUBD/CarRentBusinessLogic/BusinessLogics/RentalLogic.cs

using CarRentContracts.BindingModels;
using CarRentContracts.BusinessLogicContracts;
using CarRentContracts.SearchModels;
using CarRentContracts.StoragesContracts;
using CarRentContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CarRentBusinessLogic.BusinessLogics
{
	public class RentalLogic : IRentalLogic
	{
		private readonly IRentalStorage _rentalStorage;
		public RentalLogic(IRentalStorage RentalStorage)
		{
			_rentalStorage = RentalStorage;
		}
		public string TestInsertList(int num,
			List<ClientViewModel> clients,
			List<CarViewModel> cars)
		{
			return _rentalStorage.TestInsertList(num, clients, cars);
		}
		public string TestReadList(int num)
		{
			return _rentalStorage.TestReadList(num);
		}
		public List<RentalViewModel>? ReadList(RentalSearchModel? model)
		{
			var list = model == null ? _rentalStorage.GetFullList() :
								   _rentalStorage.GetFilteredList(model);
			if (list == null)
			{
				return null;
			}
			return list;
		}
		public RentalViewModel? ReadElement(RentalSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _rentalStorage.GetElement(model);
			if (element == null)
			{
				return null;
			}
			return element;
		}
		public bool Create(RentalBindingModel model)
		{
			CheckModel(model);
			if (_rentalStorage.Insert(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Update(RentalBindingModel model)
		{
			CheckModel(model);
			if (_rentalStorage.Update(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Delete(RentalBindingModel model)
		{
			CheckModel(model, false);
			if (_rentalStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}
		private void CheckModel(RentalBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (model.RentalCost < 0)
			{
				throw new ArgumentNullException("Цена аренды должна быть больше 0",
			   nameof(model.RentalCost));
			}
			if (model.StartDate > DateTime.Now)
			{
				throw new ArgumentNullException("Дата указана неверно",
			   nameof(model.StartDate));
			}
		}
	}
}