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 DepartmentLogic : IDepartmentLogic
	{
		private readonly IDepartmentStorage _departmentStorage;

		public DepartmentLogic(IDepartmentStorage departmentStorage)
		{
			_departmentStorage = departmentStorage ?? throw new ArgumentNullException(nameof(departmentStorage));
		}

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

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

		public DepartmentViewModel? ReadElement(DepartmentSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _departmentStorage.GetElement(model);
			if (element == null)
			{
				return null;
			}
			return element;
		}

		public List<DepartmentViewModel>? ReadList(DepartmentSearchModel? model)
		{
			var list = model == null ? _departmentStorage.GetFullList() : _departmentStorage.GetFilteredList(model);
			if (list == null)
			{
				return null;
			}
			return list;
		}

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

		private void CheckModel(DepartmentBindingModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (string.IsNullOrEmpty(model.Name))
			{
				throw new ArgumentException("Отсутвует название", 
					nameof(model.Name));
			}
			if (model.Telephone < 0)
			{
				throw new ArgumentException("Некоректный контактный телефон",
					nameof(model.Telephone));
			}
			if (_departmentStorage.GetElement(new DepartmentSearchModel
			{
				Name = model.Name,
				Telephone = model.Telephone
			}) != null)
			{
				throw new InvalidOperationException("Отдел с такими атрибутами уже есть");
			}
		}
	}
}