/* package.json
{
  "name": "znb",
  "version": "1.0.0",
  "main": "index.js",
  "license": "MIT",
  "dependencies": {
    "lowdb": "^1.0.0",
    "phantom": "^4.0.5",
    "request": "^2.82.0",
    "request-promise-native": "^1.0.4",
    "shuffle-array": "^1.0.1",
    "snoowrap": "^1.14.2"
  }
}
*/

const SUBREDDITS = [
    'FractalPorn',
    'cats',
    'foxes',
];
const ZN_PROFILE_URL = 'http://127.0.0.1:43110/Me.ZeroNetwork.bit/?Profile/' +
    '12h51ug6CcntU2aiBjhP8Ns2e5VypbWWtv/1HseT5JgPe86zAKi1e9MD9sAVoACm1xeaD/dqhufbjdxj@zeroid.bit';
const REDDIT_POLL_LIMIT = 20;
const REDDIT_CREDENTIALS = {
    username: '...',
    password: '...',
    clientId: '...',
    clientSecret: '...',
    userAgent: 'nodejs',
};
const IMGUR_CREDENTIALS = {
    clientId: '...',
    clientSecret: '...',
};
const IMGUR_HEADERS = {
    'Authorization': `Client-ID ${IMGUR_CREDENTIALS.clientId}`,
};

const fs = require('fs');
const request = require('request');
const rp = require('request-promise-native');
const phantom = require('phantom');
const snoowrap = require('snoowrap');
const lowdb = require('lowdb');
const FileSync = require('lowdb/adapters/FileSync');
const shuffle = require('shuffle-array');

const adapter = new FileSync('db.json');
const db = lowdb(adapter);

if (!db.get('imageQueue').value()) {
    db.set('imageQueue', []).write();
}

function iq(images) {
    const imageQueue = db.get('imageQueue').value();
    if (images) {
        db.set('imageQueue',
            shuffle(imageQueue.concat(images))
        ).write();
    } else {
        const image = imageQueue.pop();
        db.set('imageQueue', shuffle(imageQueue)).write();
        return image;
    }
}

function sleep(ms) {
    return new Promise(resolve =>
        setTimeout(resolve, ms)
    );
}

async function getImgurAlbumImages(albumId) {
    const response = await rp.get({
        url: `https://api.imgur.com/3/album/${albumId}/images`,
        headers: IMGUR_HEADERS,
    });
    const data = JSON.parse(response).data;
    return data.link ||
        data.map(entry => entry.link);
}

async function getImgurGalleryImages(galleryId) {
    const response = await rp.get({
        url: `https://api.imgur.com/3/gallery/${galleryId}`,
        headers: IMGUR_HEADERS,
    });
    const data = JSON.parse(response).data;
    return data.images
        ? data.images.map(entry => entry.link)
        : data.link;
}

async function getImgurImage(imageId) {
    const response = await rp.get({
        url: `https://api.imgur.com/3/image/${imageId}`,
        headers: IMGUR_HEADERS,
    });
    return JSON.parse(response).data.link;
}

function downloadFile(uri, path) {
    return new Promise(resolve =>
        request(uri).pipe(fs.createWriteStream(path)).on('close', resolve)
    );
}

async function postImage(path) {
    const instance = await phantom.create();
    const page = await instance.createPage();
    await page.open(ZN_PROFILE_URL);
    await page.switchToFrame('inner-iframe');
    await page.evaluate(function () {
        document.querySelector('.icon-image').click();
    });
    await page.uploadFile('input[type=file]', path);
    await sleep(3000);
    await page.evaluate(function () {
        document.querySelector('.button-submit').click();
    });
    await sleep(3000);
    await instance.exit();
}

(async function () {
    const reddit = new snoowrap(REDDIT_CREDENTIALS);
    while (true) {
        for (const subreddit of SUBREDDITS) {
            const submissions = await reddit.getNew(subreddit, { limit: REDDIT_POLL_LIMIT });
            for (const submission of submissions) {
                const url = submission.url;
                const url_ = url.replace(/\./g, '_');
                try {
                    if (!db.get(url_).value()) {
                        db.set(url_, true).write();
                        if (url.indexOf('.gifv') !== -1) {
                            continue;
                        }
                        const imgurAlbumMatch = url.match(/\/imgur.com\/a\/(.*)/);
                        if (imgurAlbumMatch) {
                            const images = await getImgurAlbumImages(imgurAlbumMatch[1]);
                            iq(images);
                            continue;
                        }
                        const imgurGalleryMatch = url.match(/\/imgur.com\/gallery\/(.*)/);
                        if (imgurGalleryMatch) {
                            const images = await getImgurGalleryImages(imgurGalleryMatch[1]);
                            iq(images);
                            continue;
                        }
                        const imgurImageMatch = url.match(/\/imgur.com\/(.*)/);
                        if (imgurImageMatch) {
                            const imageId = imgurImageMatch[1];
                            if (imageId.indexOf('.') === -1) {
                                const image = await getImgurImage(imageId);
                                iq([image]);
                            } else {
                                iq([url]);
                            }
                            continue;
                        }
                        if (
                            url.indexOf('i.redd.it') !== -1 ||
                            url.indexOf('i.imgur.com') !== -1
                        ) {
                            iq([submission.url]);
                        }
                    }
                } catch (e) {
                    console.warn(`Error while processing '${url}': ${e}`);
                }
            }
        }
        const imageUrl = iq();
        console.log(`[${new Date().toTimeString().slice(0, 8)}] posting ${imageUrl}...`);
        const ext = imageUrl.split('.').pop().split(/\#|\?/)[0];
        const path = `D:/Pictures/zerome-reddit/${Date.now()}.${ext}`;
        await downloadFile(imageUrl, path);
        await postImage(path);
        console.log('-> success!');
        await sleep(600000);
    }
}());