PIbd-31_Pyatakov_Kirill_COP/BusinessLogic/CityLogic.cs

using Contracts.BindingModels;
using Contracts.BusinessLogicContracts;
using Contracts.SearchModels;
using Contracts.StorageContracts;
using Contracts.ViewModels;

namespace BusinessLogic
{
    public class CityLogic : ICityStatusLogic
    {
        ICityStorage _orderStorage;

        public CityLogic(ICityStorage orderStorage)
        {
            _orderStorage = orderStorage;
        }

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

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

        public CityViewModel? ReadElement(CitySearchModel model)
        {
            if (model == null)
            {
                return null;
            }
            var element = _orderStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

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

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

        private void CheckModel(CityBindingModel model, bool param = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException($"Объект \"{model}\" нулл");
            }
            if (!param)
            {
                return;
            }
            if (model.Name == null || string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Что-то с именем клиента - его нет почему-то");
            }
        }
    }
}