using SchoolScheduleContracts.BindingModels;
using SchoolScheduleContracts.BusinessLogicsContracts;
using SchoolScheduleContracts.SearchModels;
using SchoolScheduleContracts.StoragesContracts;
using SchoolScheduleContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SchoolScheduleBusinessLogic
{
	public class SubjectLogic : ISubjectLogic
	{
		private readonly ISubjectStorage _subjectStorage;
		public SubjectLogic(ISubjectStorage subjectStorage)
		{
			_subjectStorage = subjectStorage;
		}

		public List<SubjectViewModel> ReadList(SubjectSearchModel? model)
		{
			var list = model == null ? _subjectStorage.GetFullList() :
_subjectStorage.GetFilteredList(model);
			return list;
		}

		public SubjectViewModel? ReadElement(SubjectSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			var element = _subjectStorage.GetElement(model);
			return element;
		}
		public bool Create(SubjectBindingModel model)
		{
			CheckModel(model);
			if (_subjectStorage.Insert(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Update(SubjectBindingModel model)
		{
			CheckModel(model);
			if (_subjectStorage.Update(model) == null)
			{
				return false;
			}
			return true;
		}
		public bool Delete(SubjectBindingModel model)
		{
			CheckModel(model, false);
			if (_subjectStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}


		private void CheckModel(SubjectBindingModel model, bool withParams =
	   true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.SubjectName))
			{
				throw new ArgumentNullException("Нет названия предмета",
			   nameof(model.SubjectName));
			}
			var element = _subjectStorage.GetElement(new SubjectSearchModel
			{
				SubjectName = model.SubjectName
			});
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Предмет с таким названием уже есть");

			}

		}

	}
}