'use strict';

const Promise = require('bluebird');
const bhttp = require('bhttp');
const { JSDOM } = require('jsdom');
const cheerio = require('cheerio');

async function fetchPhotos(url) {
    const res = await bhttp.get(url);

    return res.body.toString();
}

function scrapePhotos(html) {
    const $ = cheerio.load(html, { normalizeWhitespace: true });

    return $('.preview .imgLink').toArray().map((linkEl) => {
        const url = $(linkEl).attr('href');

        if (url.match('/join')) {
            // URL links to join page instead of full photo, extract thumbnail
            const src = $(linkEl).find('img').attr('src');

            if (src.match('previews/')) {
                // resource often serves full photo at a modifier URL anyway, add as primary source
                const highRes = src
                    .replace('previews/', '')
                    .replace('_tb.jpg', '.jpg');

                // keep original thumbnail as fallback in case full photo is not available
                return [highRes, src];
            }

            return src;
        }

        // URL links to full photo
        return url;
    });
}

async function getPhotos(albumPath, siteDomain) {
    const albumUrl = `https://${siteDomain}${albumPath}`;

    try {
        const html = await fetchPhotos(albumUrl);
        const $ = cheerio.load(html, { normalizeWhitespace: true });
        const photos = scrapePhotos(html);

        const pages = $('.paginatorPages a').map((pageIndex, pageElement) => $(pageElement).attr('href')).toArray();

        const otherPhotos = await Promise.map(pages, async (page) => {
            const pageUrl = `https://${siteDomain}${page}`;
            const pageHtml = await fetchPhotos(pageUrl);

            return scrapePhotos(pageHtml);
        }, {
            concurrency: 2,
        });

        return photos.concat(otherPhotos.flat());
    } catch (error) {
        console.error(`Failed to fetch ${siteDomain} photos from ${albumPath}: ${error.message}`);

        return [];
    }
}

function scrapeActorSearch(html, url, actorName) {
    const { document } = new JSDOM(html).window;
    const actorLink = document.querySelector(`a[title="${actorName}" i]`);

    return actorLink ? actorLink.href : null;
}

function scrapeProfile(html, url, actorName, siteSlug) {
    const { document } = new JSDOM(html).window;

    const avatarEl = document.querySelector('img.actorPicture');
    const descriptionEl = document.querySelector('.actorBio p:not(.bioTitle)');

    const profile = {
        name: actorName,
    };

    if (avatarEl) {
        // larger sizes usually available, provide fallbacks
        const avatars = [
            avatarEl.src.replace(/\d+x\d+/, '500x750'),
            avatarEl.src.replace(/\d+x\d+/, '240x360'),
            avatarEl.src.replace(/\d+x\d+/, '200x300'),
            avatarEl.src,
        ];

        profile.avatar = avatars;
    }

    if (descriptionEl) profile.description = descriptionEl.textContent.trim();

    profile.releases = Array.from(document.querySelectorAll('.sceneList .scene a.imgLink'), el => `https://${siteSlug}.com${el.href}`);

    return profile;
}

async function fetchProfile(actorName, siteSlug, altSearchUrl) {
    const actorSlug = actorName.toLowerCase().replace(/\s+/, '+');
    const searchUrl = altSearchUrl
        ? `https://www.${siteSlug}.com/en/search/${actorSlug}/1/actor`
        : `https://www.${siteSlug}.com/en/search/${siteSlug}/actor/${actorSlug}`;
    const searchRes = await bhttp.get(searchUrl);

    if (searchRes.statusCode !== 200) {
        return null;
    }

    const actorUrl = scrapeActorSearch(searchRes.body.toString(), searchUrl, actorName);

    if (actorUrl) {
        const url = `https://${siteSlug}.com${actorUrl}`;
        const actorRes = await bhttp.get(url);

        if (actorRes.statusCode !== 200) {
            return null;
        }

        return scrapeProfile(actorRes.body.toString(), url, actorName, siteSlug);
    }

    return null;
}

module.exports = {
    getPhotos,
    fetchProfile,
    scrapeProfile,
};