public void GiveBook(int bookId, int userId)
{
var book = _bookRepository.GetById(bookId);
if (book == null)
{
throw new NotFoundException(nameof(Book));
}
if (book.Available < 1)
{
throw new NoAvailableBooksException(book.Title);
}
var user = _readerRepository.GetById(userId);
if (user == null)
{
throw new NotFoundException(nameof(Reader));
}
_readerRepository.AddBook(user, book);
book.Available--;
_bookRepository.Update(book);
}
