using PersonnelDepartmentContracts.BindingModels;
using PersonnelDepartmentContracts.BusinessLogicContracts;
using PersonnelDepartmentContracts.SearchModels;
using PersonnelDepartmentContracts.StoragesContracts;
using PersonnelDepartmentContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PersonnelDepartmentBusinessLogic.BusinessLogics
{
	public class PositionLogic : IPositionLogic
	{
		private readonly IPositionStorage _positionStorage;

		public PositionLogic(IPositionStorage positionStorage)
		{
			_positionStorage = positionStorage ?? throw new ArgumentNullException(nameof(positionStorage));
		}

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

		public bool Delete(PositionBindingModel model)
		{
			CheckModel(model);
			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)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (string.IsNullOrEmpty(model.Name))
			{
				throw new ArgumentException("Отсутвует имя сотрудника",
					nameof(model.Name));
			}
			if (_positionStorage.GetElement(new PositionSearchModel
			{
				Name = model.Name
			}) != null)
			{
				throw new InvalidOperationException("Сотрудник с такими атрибутами уже есть");
			}
		}
	}
}