const request = require('superagent');
const _ = require('lodash');

const getTopPosts = async (subreddit, options = {}) => {
  const {count = 10, interval = 'week'} = options;
  const sub = `https://www.reddit.com/r/${subreddit}/top.json?sort=top&t=${interval}`;
  const res = await request.get(sub);
  const {children: posts} = res.body.data;

  return posts.slice(0, count).map((post) => {
    const {title, subreddit, score, url} = post.data;

    return {title, subreddit, score, url};
  });
};

const getTopPostsInFavoriteSubreddits = async (
  subreddits,
  options = {}
) => {
  const {count = 5, interval = 'week'} = options;
  const promises = subreddits.map((sub) => {
    return getTopPosts(sub, {count, interval});
  });

  return Promise.all(promises).then(_.flatten);
};

getTopPostsInFavoriteSubreddits([
  'programming',
  'javascript',
  'learnprogramming',
])
  .then(console.log)
  .catch(console.log);