SUBD_Aleikin/Restaurant/RestaurantBusinessLogic/BusinessLogics/OrderLogic.cs

using RestaurantContracts.BindingModels;
using RestaurantContracts.BusinessLogicsContracts;
using RestaurantContracts.SearchModels;
using RestaurantContracts.StoragesContracts;
using RestaurantContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace RestaurantBusinessLogic.BusinessLogics
{
    public class OrderLogic : IOrderLogic
    {
        private readonly IOrderStorage _orderStorage;

        public OrderLogic(IOrderStorage orderStorage)
        {
            _orderStorage = orderStorage;
        }

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

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

        public OrderViewModel? ReadElement(OrderSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _orderStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<OrderViewModel>? ReadList(OrderSearchModel? model)
        {
            var list = model == null ? _orderStorage.GetFullList() : _orderStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

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

        private void CheckModel(OrderBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }         
            if (model.Price <= 0)
            {
                throw new ArgumentNullException("Нет цены у заказа", nameof(model.Price));
            }
            if (model.Date != null)
            {
                throw new ArgumentNullException("Нет даты у заказа", nameof(model.Date));
            }
            var element = _orderStorage.GetElement(new OrderSearchModel
            {
                ClientId = model.ClientId,
                Date = model.Date,
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Заказ с таким номером уже есть");
            }
        }
    }
}