using BeautySaloonContracts.BindingModels;
using BeautySaloonContracts.BusinessLogicsContracts;
using BeautySaloonContracts.SearchModels;
using BeautySaloonContracts.StoragesContracts;
using BeautySaloonContracts.ViewModels;

namespace BeautySaloonBusinessLogic
{
    public class PositionLogic : IPositionLogic
    {
        private readonly IPositionStorage _positionStorage;
        public PositionLogic(IPositionStorage positionStorage)
        {
            _positionStorage = positionStorage;
        }
        public bool Create(PositionBindingModel model)
        {
            CheckModel(model);
            if (_positionStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

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

        public PositionViewModel? ReadElement(PositionSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _positionStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<PositionViewModel>? ReadList(PositionSearchModel? model)
        {
            var list = model == null ? _positionStorage.GetFullList() :
                _positionStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

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

        private void CheckModel(PositionBindingModel 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 у должности", nameof(model.Name));
            }
            var element = _positionStorage.GetElement(new PositionSearchModel
            {
                Name = model.Name
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Должность с таким названием уже есть");
            }
        }
    }
}