'use strict';

const config = require('config');
const dissectLink = require('../dissectLink.js');
const omit = require('object.omit');

const curatePosts = (userPosts, args) => {
    const processed = new Set();

    return Object.values(userPosts).reduce((accPosts, user) => accPosts.concat(user.posts.reduce((accUserPosts, post, index) => {
        // cut-off at limit, but don't count posts requested directly by ID
        if(accUserPosts.length >= args.limit && !post.direct) {
            return accUserPosts;
        }

        const host = dissectLink(post.url);
        const permalink = 'https://reddit.com' + post.permalink;

        const ignoring = args.ignore ? args.ignore.find(prop => {
            return post[prop];
        }) : null;

        if(ignoring) {
            console.log('\x1b[33m%s\x1b[0m', `Ignoring ${ignoring} post '${post.title}' (${permalink})`);

            return accUserPosts;
        }

        if(host) {
            if(config.fetch.avoidDuplicates && processed.has(host.id)) {
                console.log('\x1b[33m%s\x1b[0m', `Ignoring duplicate content '${post.url}' (cross-post, repost, or --post ID was already included) (${permalink})`);

                return accUserPosts;
            }

            if((args.include && !args.include.includes(host.label)) || (args.exclude && args.exclude.includes(host.label))) {
                console.log('\x1b[33m%s\x1b[0m', `Ignoring source '${host.label}' from post '${post.url}' (${permalink})`);

                return accUserPosts;
            }

            processed.add(host.id);
        }

        return accUserPosts.concat({
            id: post.id,
            index: index,
            title: post.title,
            text: post.selftext,
            user: omit(user, ['posts']),
            permalink,
            url: post.url,
            datetime: new Date(post.created_utc * 1000),
            subreddit: post.subreddit.display_name,
            preview: post.preview ? post.preview.images.map(image => image.source) : null,
            host
        });
    }, [])), []);
};

module.exports = curatePosts;