PIbd-32.-Stroev-V.M.-COP/WinFormsLibrary1/Businesslogic/BusinessLogics/ProductLogic.cs

using Contracts.BindingModels;
using Contracts.BusinessLogicContracts;
using Contracts.SearchModels;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLogics.BusinessLogics
{
    public class ProductLogic : IProductLogic
    {
        private readonly IProductStorage _productStorage;

        public ProductLogic(IProductStorage productStorage)
        {
            _productStorage = productStorage;
        }

        public List<ProductViewModel> ReadList(ProductSearchModel? model)
        {
            var list = model == null ? _productStorage.GetFullList() : _productStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public ProductViewModel ReadElement(ProductSearchModel? model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _productStorage.GetElement(model);

            if (element == null)
            {
                return null;
            }
            return element;
        }
        public bool Create(ProductBindingModel model)
        {
            CheckModel(model);
            if (_productStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Update(ProductBindingModel model)
        {
            CheckModel(model);
            if (_productStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }
        public bool Delete(ProductBindingModel model)
        {
            CheckModel(model, false);
            if (_productStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        private void CheckModel(ProductBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentException("Введите название продукта", nameof(model.Name));
            }
            if (string.IsNullOrEmpty(model.Description))
            {
                throw new ArgumentException("Введите описание продукта", nameof(model.Description));
            }
            if (model.Category == null)
            {
                throw new ArgumentException("Введите категорию продукта", nameof(model.Category));
            }
            if (model.CountOnStorage < 0)
            {
                throw new ArgumentException("Укажите валидное число продукта на складе", nameof(model.CountOnStorage));
            }
        }
    }
}