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

namespace BeautySaloonBusinessLogic
{
    public class EmployeeLogic : IEmployeeLogic
    {
        private readonly IEmployeeStorage _employeeStorage;
        public EmployeeLogic(IEmployeeStorage employeeStorage)
        {
            _employeeStorage = employeeStorage;
        }
        public bool Create(EmployeeBindingModel model)
        {
            CheckModel(model);
            if (_employeeStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

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

        public EmployeeViewModel? ReadElement(EmployeeSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _employeeStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<EmployeeViewModel>? ReadList(EmployeeSearchModel? model)
        {
            var list = model == null ? _employeeStorage.GetFullList() :
                _employeeStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

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

        private void CheckModel(EmployeeBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentNullException("Нет имени сотрудника", nameof(model.Name));
            }
            if (string.IsNullOrEmpty(model.Surname))
            {
                throw new ArgumentNullException("Нет фамилии сотрудника", nameof(model.Surname));
            }
            if (string.IsNullOrEmpty(model.Phone))
            {
                throw new ArgumentNullException("Нет телефона сотрудника", nameof(model.Phone));
            }
            if (model.PositionId <= 0)
            {
                throw new ArgumentNullException("Некорректный идентификатор у должности", nameof(model.PositionId));
            }
            var element = _employeeStorage.GetElement(new EmployeeSearchModel
            {
                Phone = model.Phone
            });
            if (element != null && element.Id != model.Id)
            {
                throw new InvalidOperationException("Сотрудник с таким номером телефона уже есть");
            }
        }
    }
}