SUBD_SportCompetitions/SportCompetitionsBusinessLogic/BusinessLogics/CompetitionLogic.cs

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

namespace SportCompetitionsBusinessLogic.BusinessLogics
{
	public class CompetitionLogic : ICompetitionLogic
	{
		private readonly ICompetitionStorage _competitionStorage;

		public CompetitionLogic(ICompetitionStorage competitionStorage)
		{
			_competitionStorage = competitionStorage;
		}
		public CompetitionViewModel? ReadElement(CompetitionSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			var element = _competitionStorage.GetElement(model);
			if (element == null)
			{
				return null;
			}
			return element;
		}

		public List<CompetitionViewModel>? ReadList(CompetitionSearchModel? model)
		{
			var list = model == null ? _competitionStorage.GetFullList() : _competitionStorage.GetFilteredList(model);
			if (list == null)
			{
				return null;
			}
			return list;
		}

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

		public bool Delete(CompetitionBindingModel model)
		{
			CheckModel(model, false);
			if (_competitionStorage.Delete(model) == null)
			{
				return false;
			}
			return true;
		}

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

		private void CheckModel(CompetitionBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.CompetitionName))
			{
				throw new ArgumentNullException("Нет названия", nameof(model.CompetitionName));
			}
		}
	}
}