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 EmployeeLogic : IEmployeeLogic
	{
		private readonly IEmployeeStorage _employeeStorage;

		public EmployeeLogic(IEmployeeStorage employeeStorage)
		{
			_employeeStorage = employeeStorage ?? throw new ArgumentNullException(nameof(employeeStorage));
		}

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

		public bool Delete(EmployeeBindingModel model)
		{
			CheckModel(model);
			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)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (string.IsNullOrEmpty(model.FirstName))
			{
				throw new ArgumentException("Отсутвует имя сотрудника",
					nameof(model.FirstName));
			}
			if (string.IsNullOrEmpty(model.LastName))
			{
				throw new ArgumentException("Отсутвует фамилия сотрудника",
					nameof(model.LastName));
			}
			if (string.IsNullOrEmpty(model.Patronymic))
			{
				throw new ArgumentException("Отсутвует отчество сотрудника",
					nameof(model.Patronymic));
			}
			if (_employeeStorage.GetElement(new EmployeeSearchModel
			{
				FirstName = model.FirstName,
				LastName = model.LastName,
				Patronymic = model.Patronymic
			}) != null)
			{
				throw new InvalidOperationException("Сотрудник с такими атрибутами уже есть");
			}
		}
	}
}