SUBD/CarRentBusinessLogic/BusinessLogics/BranchLogic.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 BranchLogic : IBranchLogic
	{
		private readonly IBranchStorage _branchStorage;
		public BranchLogic(IBranchStorage branchStorage)
		{		
			_branchStorage = branchStorage;
		}
		public List<BranchViewModel>? ReadList(BranchSearchModel? model)
		{			
			var list = model == null ? _branchStorage.GetFullList() :
								   _branchStorage.GetFilteredList(model);
			if (list == null)
			{
				return null;
			}
			return list;
		}
		public BranchViewModel? ReadElement(BranchSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _branchStorage.GetElement(model);
			if (element == null)
			{
				return null;
			}
			return element;
		}
		public bool Create(BranchBindingModel model)
		{
			CheckModel(model);
			if (_branchStorage.Insert(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Update(BranchBindingModel model)
		{
			CheckModel(model);
			if (_branchStorage.Update(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Delete(BranchBindingModel model)
		{
			CheckModel(model, false);
			if (_branchStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}
		private void CheckModel(BranchBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.Name))
			{
				throw new ArgumentNullException("Нет названия филиала",
			   nameof(model.Name));
			}
			if (string.IsNullOrEmpty(model.Address))
			{
				throw new ArgumentNullException("Нет адреса филиала",
			   nameof(model.Address));
			}
			if (string.IsNullOrEmpty(model.PhoneNumber))
			{
				throw new ArgumentNullException("Нет номера телефона филиала",
			   nameof(model.PhoneNumber));
			}

			var element = _branchStorage.GetElement(
				new BranchSearchModel
				{
					Name = model.Name
				}
			);
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Филиал с таким названием уже есть");
			}
		}
	}
}