SUBD_SushiBar/SushiBar/SushiBarBusinessLogic/BusinessLogics/BuyerLogic.cs

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

namespace SushiBarBusinessLogic.BusinessLogics
{
    public class BuyerLogic : IBuyerLogic
    {

        private readonly IBuyerStorage _buyerStorage;

        public BuyerLogic(IBuyerStorage buyerStorage)
        {
            _buyerStorage = buyerStorage;
        }
        public BuyerViewModel? ReadElement(BuyerSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }

            var element = _buyerStorage.GetElement(model);
            if(element == null)
            {
                return null;
            }
            return element;
        }

        public List<BuyerViewModel>? ReadList(BuyerSearchModel? model)
        {
            var list = model == null ? _buyerStorage.GetFullList() : _buyerStorage.GetFilteredList(model);
            if(list == null)
            {
                return null;
            }
            return list;
        }

        public bool Create(BuyerBindingModel model)
        {
            CheckModel(model);
            if (_buyerStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Delete(BuyerBindingModel model)
        {
            CheckModel(model, false);
            if(_buyerStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Update(BuyerBindingModel model)
        {
            CheckModel(model);
            if(_buyerStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }

        private void CheckModel(BuyerBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.BuyerName))
            {
                throw new ArgumentNullException("Нет названия", nameof(model.BuyerName));
            }
        }
    }
}