csblogs/api-server

import express from 'express';
import * as posts from './post-controller';

const router = express.Router(); // eslint-disable-line new-cap

function respondGetAll(res) {
  posts.getAll()
    .then(allPosts => {
      res.json(allPosts);
    })
    .catch(() => {
      res.status(500).json({ error: 'Could not get list of posts' });
    });
}

function respondGetAllByAuthor(res, authorId) {
  posts.getByAuthor(authorId)
    .then(allPostsByAuthor => {
      res.json(allPostsByAuthor);
    })
    .catch(() => {
      res.status(500).json({ error: 'Could not get list of posts by author' });
    });
}

const DEFAULT_PAGE_SIZE = 10;
const DEFAULT_PAGE_NUMBER = 0;
function respondGetPage(res, pageNumber, pageSize) {
  posts.getPage(pageNumber || DEFAULT_PAGE_NUMBER, pageSize || DEFAULT_PAGE_SIZE)
    .then(pageOfPosts => {
      res.json(pageOfPosts);
    })
    .catch(() => {
      res.status(500).json({ error: 'Could not get page of posts' });
    });
}

function respondGetAuthorPage(res, authorId, pageNumber, pageSize) {
  posts.getByAuthorPage(authorId, pageNumber, pageSize)
    .then(pageOfPosts => {
      res.json(pageOfPosts);
    })
    .catch(() => {
      res.status(500).json({ error: 'Could not get page of authors posts' });
    });
}

router.get('/', (req, res) => {
  const pageNumber = req.query.page;
  const pageSize = req.query.page_size;

  const authorId = req.query.author_id;

  if (authorId && pageNumber) {
    respondGetAuthorPage(res, authorId, pageNumber, pageSize);
  } else if (authorId) {
    respondGetAllByAuthor(res, authorId);
  } else if (pageNumber || pageSize) {
    respondGetPage(res, pageNumber, pageSize);
  } else {
    respondGetAll(res);
  }
});

router.get('/:id', (req, res) => {
  const id = req.params.id;
  posts.getById(id)
    .then(post => {
      post ? res.json(post) : res.status(404).json({ error: 'No such post' });
    })
    .catch(() => {
      res.status(500).json({ error: 'Could not get post' });
    });
});

export default router;