import { countWords, ensureIdentity } from '@app/server/helpers';
import { IdentityContext } from '@app/server/identity';
import { prisma, uuid } from '@app/server/prisma/client';
import { updateBookStats } from '@app/server/service/book';
import { BookChapter, MutationBookChapterCreateArgs } from '@generated/types';
import { toBookChapterSchema } from './mappers/bookChapterMapper';

export async function BookChapterCreateResolver(
  _: any,
  { input }: MutationBookChapterCreateArgs,
  { req, res, identity }: IdentityContext
): Promise<BookChapter> {
  ensureIdentity(identity);

  if (input.title.length > 60) throw new Error('Title is too long.');
  if (input.foreword != null && input.foreword.length > 500)
    throw new Error('Foreword is too long.');
  if (input.footnote != null && input.footnote.length > 500)
    throw new Error('Footnote is too long.');

  const chapterCount = await prisma.bookChapter.count({ where: { bookId: input.bookId } });

  const model = await prisma.bookChapter.create({
    data: {
      id: uuid(),
      bookId: input.bookId,
      title: input.title,
      foreword: input.foreword,
      footnote: input.footnote,
      content: input.content,
      wordsTotal: countWords(input.content),
      sequenceNumber: chapterCount + 1
    }
  });

  await updateBookStats(input.bookId);
  return toBookChapterSchema(model, { req, res, identity });
}