'use strict';

const config = require('config');
const fs = require('fs-extra');
const yaml = require('js-yaml');

const interpolate = require('../interpolate.js');

async function writeToIndex(posts, profilePaths, user) {
    const filename = interpolate(config.library.index.file, user, null, false);
    const now = new Date();

    const newAndUpdatedEntries = posts.concat(user.indexed.updated).map((post) => {
        const entryPost = {
            id: post.id,
            subreddit: post.subreddit,
            permalink: post.permalink,
            url: post.url,
            hostId: post.host.id,
            date: post.datetime,
            indexed: now,
            title: post.title,
        };

        if (post.previewFallback) {
            entryPost.preview = true;
        }

        return entryPost;
    });

    const data = {
        profile: {
            image: profilePaths.image,
            description: profilePaths.description,
        },
        posts: newAndUpdatedEntries.concat(user.indexed.original),
    };

    if (!data.profile.image && !data.profile.description && !data.posts.length) {
        return;
    }

    return fs.writeFile(filename, yaml.safeDump(data));
}

module.exports = writeToIndex;