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 DealLogic : IDealLogic
	{
		private readonly IDealStorage _dealStorage;

		public DealLogic(IDealStorage dealStorage)
		{
			_dealStorage = dealStorage ?? throw new ArgumentNullException(nameof(dealStorage));	
		}

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

		public bool Delete(DealBindingModel model)
		{
			CheckModel(model);
			if (_dealStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}

		public DealViewModel? ReadElement(DealSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _dealStorage.GetElement(model);
			if (element == null)
			{
				return null;
			}
			return element;
		}

		public List<DealViewModel>? ReadList(DealSearchModel? model)
		{
			var list = model == null ? _dealStorage.GetFullList() : _dealStorage.GetFilteredList(model);
			if (list == null) 
			{
				return null;
			}
			return list;
		}

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

		private void CheckModel(DealBindingModel model) 
		{ 
			if (model == null) 
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (model.DepartmentId < 0)
			{
				throw new ArgumentNullException("Некорректный идентификатор отдела",
					nameof(model.DepartmentId));
			}
			if (model.EmployeeId < 0)
			{
				throw new ArgumentNullException("Некорректный идентификатор сотрудника",
					nameof(model.EmployeeId));
			}
			if (model.PositionId < 0)
			{
				throw new ArgumentNullException("Некорректный идентификатор должности",
					nameof(model.PositionId));
			}
			if (model.TypeId < 0)
			{
				throw new ArgumentNullException("Некорректный идентификатор типа договора",
					nameof(model.TypeId));
			}
			if (_dealStorage.GetElement(new DealSearchModel
			{
				DateFrom = model.DateFrom,
				DateTo = model.DateTo,
				DepartmentId = model.DepartmentId,
				EmployeeId = model.EmployeeId,
				PositionId = model.PositionId,
				TypeId = model.TypeId
			}) != null)
			{
				throw new InvalidOperationException("Договор с такими атрибутами уже есть");
			}
		}
	}
}