public async Task Process(RemoveBookInput input)
{
Book book = await bookReadOnlyRepository.Get(input.BookId);
if (book == null)
{
throw new BookNotFoundException($"The book {input.BookId} does not exist.");
}
Basket basket = (input.BasketId != null)? await basketReadOnlyRepository.Get(input.BasketId):new Basket();
Removal removal = new Removal(book.Id);
basket.RemoveBook(removal);
await basketWriteOnlyRepository.Update(basket);
OrderOutput orderResponse = outputConverter.Map <OrderOutput>(removal);
RemoveBookOutput output = new RemoveBookOutput(orderResponse, basket.GetTotalPrice().Value);
outputBoundary.Populate(output);
}
