'use strict';

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

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, site) {
    const albumUrl = `${site.url}${albumPath}`;

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

        const lastPage = $('.Gamma_Paginator a.last').attr('href')?.match(/\d+$/)[0];

        if (lastPage) {
            const otherPages = Array.from({ length: Number(lastPage) }, (_value, index) => index + 1).slice(1);

            const otherPhotos = await Promise.map(otherPages, async (page) => {
                const pageUrl = `${site.url}/${albumPath}/${page}`;
                const pageHtml = await fetchPhotos(pageUrl);

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

            return photos.concat(otherPhotos.flat());
        }

        return photos;
    } catch (error) {
        console.error(`Failed to fetch ${site.name} photos from ${albumUrl}: ${error.message}`);

        return [];
    }
}

async function scrapeApiReleases(json, site) {
    return json.map((scene) => {
        const release = {
            entryId: scene.clip_id,
            title: scene.title,
            description: scene.description,
            duration: scene.length,
            likes: scene.ratings_up,
            dislikes: scene.ratings_down,
        };

        release.url = `${site.url}/en/video/${scene.url_title}/${release.entryId}`;
        release.date = moment.utc(scene.release_date, 'YYYY-MM-DD').toDate();
        release.actors = scene.actors.map(({ name }) => name);
        release.director = scene.directors[0].name;

        release.tags = scene.master_categories.concat(scene.categories?.map(category => category.name));

        const posterPath = scene.pictures.resized || (scene.pictures.nsfw?.top && Object.values(scene.pictures.nsfw.top)[0]);

        if (posterPath) {
            release.poster = [
                `https://images-evilangel.gammacdn.com/movies${posterPath}`,
                `https://transform.gammacdn.com/movies${posterPath}`,
            ];
        }

        release.movie = `${site.url}/en/movie/${scene.url_movie_title}/${scene.movie_id}`;

        return release;
    });
}

function scrapeAll(html, site) {
    const $ = cheerio.load(html, { normalizeWhitespace: true });
    const scenesElements = $('li[data-itemtype=scene]').toArray();

    return scenesElements.map((element) => {
        const sceneLinkElement = $(element).find('.sceneTitle a');

        const url = `${site.url}${sceneLinkElement.attr('href')}`;
        const title = sceneLinkElement.attr('title');

        const entryId = $(element).attr('data-itemid');

        const date = moment
            .utc($(element).find('.sceneDate').text(), 'MM-DD-YYYY')
            .toDate();

        const actors = $(element).find('.sceneActors a')
            .map((actorIndex, actorElement) => $(actorElement).attr('title'))
            .toArray();

        const [likes, dislikes] = $(element).find('.value')
            .toArray()
            .map(value => Number($(value).text()));

        const poster = $(element).find('.imgLink img').attr('data-original');
        const trailer = `https://videothumb.gammacdn.com/307x224/${entryId}.mp4`;

        return {
            url,
            entryId,
            title,
            actors,
            director: 'Mason',
            date,
            poster,
            trailer: {
                src: trailer,
                quality: 224,
            },
            rating: {
                likes,
                dislikes,
            },
            site,
        };
    });
}

async function scrapeScene(html, url, site) {
    const $ = cheerio.load(html, { normalizeWhitespace: true });
    const release = { $ };

    const json = $('script[type="application/ld+json"]').html();
    const videoJson = $('script:contains("window.ScenePlayerOptions")').html();

    const [data, data2] = JSON.parse(json);
    const videoData = JSON.parse(videoJson.slice(videoJson.indexOf('{'), videoJson.indexOf('};') + 1));

    [release.entryId] = new URL(url).pathname.split('/').slice(-1);

    release.title = data.name;
    release.description = data.description;

    // date in data object is not the release date of the scene, but the date the entry was added
    const dateString = $('.updatedDate').first().text().trim();
    const dateMatch = dateString.match(/\d{2,4}-\d{2}-\d{2,4}/)?.[0];
    release.date = moment.utc(dateMatch, ['MM-DD-YYYY', 'YYYY-MM-DD']).toDate();

    release.director = data.director?.[0].name || data2?.director?.[0].name;
    release.actors = data.actor.map(actor => actor.name);
    const hasTrans = data.actor.some(actor => actor.gender === 'shemale');

    const stars = (data.aggregateRating.ratingValue / data.aggregateRating.bestRating) * 5;
    if (stars) release.rating = { stars };

    release.duration = moment.duration(data.duration.slice(2).split(':')).asSeconds();

    const rawTags = data.keywords?.split(', ');
    release.tags = hasTrans ? [...rawTags, 'transsexual'] : rawTags;

    release.poster = videoData.picPreview;
    release.photos = await getPhotos($('.picturesItem a').attr('href'), site);

    const trailer = `${videoData.playerOptions.host}${videoData.url}`;
    release.trailer = [
        {
            src: trailer.replace('hd', 'sm'),
            quality: 240,
        },
        {
            src: trailer.replace('hd', 'med'),
            quality: 360,
        },
        {
            src: trailer.replace('hd', 'big'),
            quality: 480,
        },
        {
            // probably 540p
            src: trailer,
            quality: parseInt(videoData.sizeOnLoad, 10),
        },
        {
            src: trailer.replace('hd', '720p'),
            quality: 720,
        },
        {
            src: trailer.replace('hd', '1080p'),
            quality: 1080,
        },
        {
            src: trailer.replace('hd', '4k'),
            quality: 2160,
        },
    ];

    return release;
}

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 hairEl = document.querySelector('.actorProfile .attribute_hair_color');
    const heightEl = document.querySelector('.actorProfile .attribute_height');
    const weightEl = document.querySelector('.actorProfile .attribute_weight');
    const aliasEl = document.querySelector('.actorProfile .attribute_alternate_names');
    const nationalityEl = document.querySelector('.actorProfile .attribute_home');

    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();
    if (hairEl) profile.hair = hairEl.textContent.split(':')[1].trim();
    if (heightEl) profile.height = Number(heightEl.textContent.match(/\d+/)[0]);
    if (weightEl) profile.weight = Number(weightEl.textContent.match(/\d+/)[0]);
    if (aliasEl) profile.aliases = aliasEl.textContent.split(':')[1].trim().split(', ');
    if (nationalityEl) profile.nationality = nationalityEl.textContent.split(':')[1].trim();

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

    return profile;
}

function scrapeApiProfile(data, releases, siteSlug) {
    const profile = {};

    if (data.male === 1) profile.gender = 'male';
    if (data.female === 1) profile.gender = 'female';
    if (data.shemale === 1 || data.trans === 1) profile.gender = 'transsexual';

    if (data.description) profile.description = data.description.trim();

    if (data.attributes.ethnicity) profile.ethnicity = data.attributes.ethnicity;
    if (data.attributes.eye_color) profile.eyes = data.attributes.eye_color;
    if (data.attributes.hair_color) profile.hair = data.attributes.hair_color;

    const avatarPath = Object.values(data.pictures).reverse()[0];
    if (avatarPath) profile.avatar = `https://images01-evilangel.gammacdn.com/actors${avatarPath}`;

    profile.releases = releases.map(release => `https://${siteSlug}.com/en/video/${release.url_title}/${release.clip_id}`);

    return profile;
}

async function fetchApiCredentials(referer) {
    const res = await bhttp.get(referer);
    const body = res.body.toString();

    const apiLine = body.split('\n').find(bodyLine => bodyLine.match('apiKey'));
    const apiSerial = apiLine.slice(apiLine.indexOf('{'), apiLine.indexOf('};') + 1);
    const apiData = JSON.parse(apiSerial);

    const { applicationID: appId, apiKey } = apiData.api.algolia;
    const userAgent = 'Algolia for vanilla JavaScript (lite) 3.27.0;instantsearch.js 2.7.4;JS Helper 2.26.0';

    const apiUrl = `https://${appId.toLowerCase()}-dsn.algolia.net/1/indexes/*/queries?x-algolia-agent=${userAgent}&x-algolia-application-id=${appId}&x-algolia-api-key=${apiKey}`;

    return {
        appId,
        apiKey,
        userAgent,
        apiUrl,
    };
}

async function fetchApiLatest(site, page = 1, upcoming = false) {
    const referer = `${site.url}/en/videos`;
    const { apiUrl } = await fetchApiCredentials(referer);

    const res = await bhttp.post(apiUrl, {
        requests: [
            {
                indexName: 'all_scenes',
                params: `query=&hitsPerPage=36&maxValuesPerFacet=100&page=${page - 1}&facetFilters=[["lesbian:"],["bisex:"],["shemale:"],["upcoming:${upcoming ? 1 : 0}"]]`,
            },
        ],
    }, {
        headers: {
            Referer: referer,
        },
        encodeJSON: true,
    });

    return scrapeApiReleases(res.body.results[0].hits, site);
}

async function fetchApiUpcoming(site) {
    return fetchApiLatest(site, 1, true);
}

async function fetchLatest(site, page = 1) {
    const res = await bhttp.get(`${site.url}/en/videos/AllCategories/0/${page}`);

    return scrapeAll(res.body.toString(), site);
}

async function fetchUpcoming(site) {
    const res = await bhttp.get(`${site.url}/en/videos/AllCategories/0/1/upcoming`);

    return scrapeAll(res.body.toString(), site);
}

async function fetchScene(url, site) {
    const res = await bhttp.get(url);

    return scrapeScene(res.body.toString(), url, site);
}

async function fetchActorScenes(actorName, apiUrl, siteSlug) {
    const res = await bhttp.post(apiUrl, {
        requests: [
            {
                indexName: 'all_scenes',
                params: `query=&hitsPerPage=36&maxValuesPerFacet=100&page=0&facetFilters=[["lesbian:"],["bisex:"],["shemale:"],["actors.name:${actorName}"]]`,
            },
        ],
    }, {
        headers: {
            Referer: `https://www.${siteSlug}.com/en/videos`,
        },
        encodeJSON: true,
    });

    if (res.statusCode === 200 && res.body.results[0].hits.length > 0) {
        return res.body.results[0].hits;
    }

    return [];
}

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;
}

async function fetchApiProfile(actorName, siteSlug) {
    const actorSlug = encodeURI(actorName);
    const referer = `https://www.${siteSlug}.com/en/search?query=${actorSlug}&tab=actors`;

    const { apiUrl } = await fetchApiCredentials(referer);

    const res = await bhttp.post(apiUrl, {
        requests: [
            {
                indexName: 'all_actors',
                params: `query=${actorSlug}`,
            },
        ],
    }, {
        headers: {
            Referer: referer,
        },
        encodeJSON: true,
    });

    if (res.statusCode === 200 && res.body.results[0].hits.length > 0) {
        const actorData = res.body.results[0].hits.find(actor => actor.name === actorName);

        if (actorData) {
            const actorScenes = await fetchActorScenes(actorName, apiUrl, siteSlug);

            return scrapeApiProfile(actorData, actorScenes, siteSlug);
        }
    }

    return null;
}

module.exports = {
    fetchApiLatest,
    fetchApiProfile,
    fetchApiUpcoming,
    fetchLatest,
    fetchProfile,
    fetchScene,
    fetchUpcoming,
    getPhotos,
    scrapeApiProfile,
    scrapeApiReleases,
    scrapeProfile,
    scrapeAll,
    scrapeScene,
};