'use strict';

const config = require('config');
const Snoowrap = require('snoowrap');
const exiftool = require('node-exiftool');
const exiftoolBin = require('dist-exiftool');

require('array.prototype.flatten').shim();

const reddit = new Snoowrap(config.reddit.api);
const args = require('./cli.js')();

const curatePosts = require('./curate/posts.js');

const attachContentInfo = require('./fetch/info.js');
const fetchSaveContent = require('./fetch/content.js');

const getPosts = require('./sources/getPosts.js')(reddit, args);
const getUserPosts = require('./sources/getUserPosts.js')(reddit, args);

async function getCompleteUserPosts() {
    let userPosts = await getUserPosts(args.users);

    if (args.posts) {
        userPosts = await getPosts(args.posts, userPosts);
    }

    const curatedUserPosts = curatePosts(userPosts, args);

    return attachContentInfo(curatedUserPosts);
}

function fetchSavePosts(userPosts, ep) {
    return Promise.all(Object.values(userPosts).map(user => fetchSaveContent(user, ep)));
}

async function initApp() {
    const usersProvided = args.users && args.users.length;
    const postIdsProvided = args.posts && args.posts.length;

    if (!usersProvided && !postIdsProvided) {
        return console.log('\x1b[31m%s\x1b[0m', 'Please supply at least one user or post ID. See --help for more details.');
    }

    try {
        const userPosts = await getCompleteUserPosts();
        const ep = new exiftool.ExiftoolProcess(exiftoolBin);

        await ep.open();
        await fetchSavePosts(userPosts, ep);

        return ep.close();
    } catch (error) {
        console.error(error);
    }
}

initApp();