'use strict';

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

const interpolate = require('../interpolate');
// const textToStream = require('./textToStream');
const save = require('./save');
const logger = require('../logger')(__filename);

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

    const newAndUpdatedEntries = posts.concat(user.indexed.updated, args.indexIgnored ? user.indexed.ignored : []).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,
            score: post.score,
            title: post.title,
            hash: post.hash,
        };

        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 false;
    }

    try {
        const yamlIndex = yaml.safeDump(data);
        const saved = await save(filepath, Buffer.from(yamlIndex, 'utf8'));

        logger.info(`Saved index with ${posts.length} new posts for ${user.name}`);

        return saved;
    } catch (error) {
        logger.error(`Could not save index for ${user.name}: ${error.message}`);
        return null;
    }
}

module.exports = writeToIndex;