// @flow
import Router from 'koa-router';
import auth from '../middlewares/authentication';
import pagination from './middlewares/pagination';
import { presentRevision } from '../presenters';
import { Document, Revision } from '../models';
import { NotFoundError } from '../errors';
import policy from '../policies';

const { authorize } = policy;
const router = new Router();

router.post('revisions.info', auth(), async ctx => {
  let { id } = ctx.body;
  ctx.assertPresent(id, 'id is required');

  const user = ctx.state.user;
  const revision = await Revision.findByPk(id);
  if (!revision) {
    throw new NotFoundError();
  }

  const document = await Document.findByPk(revision.documentId, {
    userId: user.id,
  });
  authorize(user, 'read', document);

  ctx.body = {
    pagination: ctx.state.pagination,
    data: await presentRevision(revision),
  };
});

router.post('revisions.list', auth(), pagination(), async ctx => {
  let { documentId, sort = 'updatedAt', direction } = ctx.body;
  if (direction !== 'ASC') direction = 'DESC';
  ctx.assertPresent(documentId, 'documentId is required');

  const user = ctx.state.user;
  const document = await Document.findByPk(documentId, { userId: user.id });
  authorize(user, 'read', document);

  const revisions = await Revision.findAll({
    where: { documentId: document.id },
    order: [[sort, direction]],
    offset: ctx.state.pagination.offset,
    limit: ctx.state.pagination.limit,
  });

  const data = await Promise.all(
    revisions.map(revision => presentRevision(revision))
  );

  ctx.body = {
    pagination: ctx.state.pagination,
    data,
  };
});

export default router;