import { ensureIdentity } from '@app/server/helpers';
import { IdentityContext } from '@app/server/identity';
import { prisma } from '@app/server/prisma/client';
import { updateBookStats } from '@app/server/service/book';
import { Book, MutationBookChapterDeleteArgs } from '@generated/types';
import { toBookSchema } from './mappers/bookMapper';

export async function BookChapterDeleteResolver(
  _: any,
  { id }: MutationBookChapterDeleteArgs,
  { req, res, identity }: IdentityContext
): Promise<Book> {
  ensureIdentity(identity);
  const model = await prisma.bookChapter.findUniqueOrThrow({
    where: { id },
    select: { book: { select: { id: true, authorId: true } } }
  });
  if (identity.id !== model.book.authorId) throw new Error('Operation is not permitted.');

  await prisma.bookChapter.delete({ where: { id } });

  await updateBookStats(model.book.id);
  const book = await prisma.book.findUniqueOrThrow({ where: { id: model.book.id } });
  return toBookSchema(book, { req, res, identity });
}