using Contracts.BindingModels;
using Contracts.BusinessLogicContracts;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLogic
{
	public class AuthorLogic:IAuthorLogic
	{
		private readonly IAuthorStorage _authorStorage;
		public AuthorLogic(IAuthorStorage authorStorage)
		{
			_authorStorage = authorStorage;
		}

		public void CreateOrUpdate(AuthorBindingModel model)
		{
			var element = _authorStorage.GetElement(
			   new AuthorBindingModel
			   {
				   FIO = model.FIO
			   });
			if (element != null && element.Id != model.Id)
			{
				throw new Exception("Такой автор уже существует");
			}
			if (model.Id.HasValue)
			{
				_authorStorage.Update(model);
			}
			else
			{
				_authorStorage.Insert(model);
			}
		}

		public void Delete(AuthorBindingModel model)
		{
			var element = _authorStorage.GetElement(new AuthorBindingModel { Id = model.Id });
			if (element == null)
			{
				throw new Exception("Автор не найден");
			}
			_authorStorage.Delete(model);
		}

		public List<AuthorViewModel> Read(AuthorBindingModel model)
		{
			if (model == null)
			{
				return _authorStorage.GetFullList();
			}
			if (model.Id.HasValue)
			{
				return new List<AuthorViewModel> { _authorStorage.GetElement(model) };
			}
			return _authorStorage.GetFilteredList(model);
		}
	}
}