'use strict';

const Promise = require('bluebird');

const getIndex = require('./getIndex.js');
const getArchivePostIds = require('../archives/getArchivePostIds.js');
const curateUser = require('../curate/user.js');

async function getUser(username, reddit) {
    try {
        const user = await reddit.getUser(username).fetch();

        console.log(`Fetched user profile for '${username}' (https://reddit.com/user/${username})`);

        return curateUser(user);
    } catch (error) {
        console.log('\x1b[31m%s\x1b[0m', `Failed to fetch reddit user '${username}': ${error.message} (https://reddit.com/user/${username})`);

        return {
            name: username,
            fallback: true,
        };
    }
}

async function getPosts(username, reddit, args) {
    try {
        const submissions = await reddit
            .getUser(username)
            .getSubmissions({
                sort: args.sort,
                limit: Infinity,
            });

        console.log(`Fetched ${submissions.length} submissions for '${username}' (https://reddit.com/user/${username})`);

        return submissions;
    } catch (error) {
        console.log('\x1b[31m%s\x1b[0m', `Failed to fetch posts from reddit user '${username}': ${error.message} (https://reddit.com/user/${username})`);

        return [];
    }
}

async function getArchivedPosts(username, posts, reddit) {
    const postIds = await getArchivePostIds(username, posts.map(post => post.id));

    return Promise.all(postIds.map(postId => reddit.getSubmission(postId).fetch()));
}

function getUserPostsWrap(reddit, args) {
    return async function getUserPosts(usernames) {
        const users = await Promise.map(usernames, async (username) => {
            const [user, posts] = await Promise.all([
                getUser(username, reddit),
                getPosts(username, reddit, args),
            ]);

            const { profile, posts: indexed } = await getIndex(user);

            if (args.archives) {
                posts.push(...await getArchivedPosts(username, posts, reddit));
            }

            if (posts.length) {
                return { ...user, posts, indexed: { profile, original: indexed, updated: [] } };
            }

            return null;
        });

        return users.reduce((userPosts, user) => (user ? { ...userPosts, [user.name]: user } : userPosts), {});
    };
}

module.exports = getUserPostsWrap;