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

namespace BookBusinessLogic.BusinessLogic
{
    public class ReaderLogic : IReaderLogic
    {
        private readonly IReaderStorage _readerStorage;

        public ReaderLogic(IReaderStorage readerStorage)
        {
            _readerStorage = readerStorage;
        }

        public void CreateOrUpdate(ReaderBindingModel model)
        {
            var element = _readerStorage.GetElement(new ReaderBindingModel { Name = model.Name });
            if (element != null && element.Id != model.Id)
            {
                throw new Exception("Книги с таким названием тут нет");
            }
            if (model.Id.HasValue)
            {
                _readerStorage.Update(model);
            }
            else
            {
                _readerStorage.Insert(model);
            }
        }

        public void Delete(ReaderBindingModel model)
        {
            var element = _readerStorage.GetElement(new ReaderBindingModel { Name = model.Name });
            if (element == null)
            {
                throw new Exception("Книги с таким названием тут нет");
            }
            _readerStorage.Delete(model);
        }

        public List<ReaderViewModel> Read(ReaderBindingModel model)
        {
            if (model == null)
                return _readerStorage.GetFullList();
            if (model.Id.HasValue)
            {
                return new List<ReaderViewModel> {
                    _readerStorage.GetElement(model)
                };
            }
            return _readerStorage.GetFullList();
        }
    }
}