import type { SimulationFunction } from '@x12i/api-simulator';
import { findBook } from '../state/checkout-ledger.js';

/** GET /books/:bookId -- a plain lookup, with a custom 404 when nothing matches. */
export const getBook: SimulationFunction = ({ request }) => {
  const bookId = request.params.bookId ?? '';
  const book = findBook(bookId);

  if (!book) {
    return {
      status: 404,
      body: { error: 'BOOK_NOT_FOUND', message: `No book with id ${bookId}.` }
    };
  }

  return { status: 200, body: book };
};