'use strict';

const Promise = require('bluebird');

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

const logger = require('../logger')(__filename);
const limiter = require('../limiter').reddit;

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

        return curateUser(user);
    } catch (error) {
        logger.error(`Failed to fetch reddit user '${username}': ${error.message} (https://reddit.com/user/${username})`);

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

const getPostsWrap = reddit => function getPosts(postIds, userPosts = {}) {
    return Promise.reduce(postIds, (accUserPosts, postId) => Promise.resolve().then(async () => {
        const post = await limiter.schedule(async () => reddit.getSubmission(postId).fetch());

        post.direct = true;

        if (accUserPosts[post.author.name]) {
            return {
                ...accUserPosts,
                [post.author.name]: {
                    ...accUserPosts[post.author.name],
                    posts: [...accUserPosts[post.author.name].posts, post],
                },
            };
        }

        // don't attempt to fetch deleted user
        if (post.author.name === '[deleted]') {
            return {
                ...accUserPosts,
                '[deleted]': {
                    name: '[deleted]',
                    deleted: true,
                    posts: [post],
                    indexed: {
                        profile: {},
                        original: [],
                        updated: [],
                    },
                },
            };
        }

        const user = await getUser(post.author.name, reddit);
        const { profile, posts: indexed } = await getIndex(user);

        return {
            ...accUserPosts,
            [post.author.name]: {
                ...user,
                posts: [post],
                indexed: {
                    profile,
                    original: indexed,
                    updated: [],
                },
            },
        };
    }), userPosts);
};

module.exports = getPostsWrap;