// ==UserScript==
// @name         Tiktok-Downloader
// @version      1.0.2
// @description  tiktok.com Video Downloader
// @match        https://www.tiktok.com/*
// @match        https://tiktok.com/*
// @grant        GM_download
// @grant        GM_addStyle
// @grant        GM_xmlhttpRequest
// @connect      tiktok.com
// @connect      api-t2.tiktokv.com
// @icon         https://s16.tiktokcdn.com/musical/resource/wap/static/image/logo_144c91a.png?v=2
// @original     https://greasyfork.org/users/209098
// @license      MIT
// ==/UserScript==

(function () {
    'use strict'

    GM_addStyle(
        "#anastasia-i-love-u { position: absolute;  top: 20px; left: 20px; z-index: 9001; width: 48px; height: 48px; opacity: 0.95; font-size: 15px; line-height: 50%; border: none; " +
        "background: #545454; color: #FFF; cursor: pointer; border-radius: 100%; transition: opacity 0.4s; } #anastasia-i-love-u:disabled { opacity: 0.01; background-color: #c0392b; } " +
        ".vid_height_add { top: 78px !important; width: 40px !important; height: 40px !important;}"
    );

    GM_addStyle(".logo { display: none !important; } .mute-icon { opacity: 1 !important; } ");

    /*///////////////////////////////////
          WORKING AS OF 07/02/2021
    /*///////////////////////////////////
    function generateBase62(length) {
        var i = 0, r = "", base62 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
        while (i < length) {
            r += base62.charAt(Math.floor(Math.random() * 62));
            i++;
        }
        return r;
    }

    function generateDeviceId() {
        var i = 1, a = new Array(19); //Math.floor(Math.random() * 9) + 11
        a[0] = 54; //Math.floor(Math.random() * 9) + 49
        while (i < a.length) {
            a[i++] = Math.floor(Math.random() * 10) + 48;
        }
        return String.fromCharCode.apply(null, a);
    }

    function getAPIData(ID) {
        const d = new Date();
        const t = d.getTime() - d.getTimezoneOffset() * 60000;
        const deviceVersion = generateBase62(8);
        const deviceId = generateDeviceId();
        const iId = generateDeviceId();
        const url = "https://api-t2.tiktokv.com/aweme/v1/multi/aweme/detail/?aweme_ids="
        + "[" + ID + "]"
        + "&region=US"
        + "&ts=" + Math.floor(t / 1000)
        + "&timezone_name=Etc%2FGMT"
        + "&device_type=Pixel%20" + deviceVersion
        + "&iid=" + iId
        + "&locale=en"
        + "&app_type=normal"
        + "&resolution=1080*1920"
        + "&aid=1180"
        + "&app_name=musical_ly"
        + "&_rticket=" + t
        + "&device_platform=android"
        + "&version_code=100000"
        + "&dpi=441"
        + "&cpu_support64=false"
        + "&sys_region=US"
        + "&timezone_offset=0"
        + "&device_id=" + deviceId
        + "&pass-route=1"
        + "&device_brand=google"
        + "&os_version=8.0.0"
        + "&op_region=US"
        + "&app_language=en"
        + "&pass-region=1"
        + "&language=en"
        + "&channel=googleplay"
        console.log(url);

        GM_xmlhttpRequest({
            method:     "GET",
            url:        url,
            headers:    {
                "User-Agent": "okhttp"
            },
            onload:  downloadLink
        });
    }

    function downloadLink(dat) {
        const downloadBtn = document.getElementById('anastasia-i-love-u');
        if (!downloadBtn) return;

        try {
            dat = JSON.parse(dat.responseText);
            const ID = dat.aweme_details[0].aweme_id

            dat = dat.aweme_details[0].video.play_addr.url_list
            dat = dat[dat.length - 1]
                .replace("improve_bitrate=0", "improve_bitrate=1")
                .replace(/ratio=\d+p/i, "ratio=default");

            const fileName = `${ID}.mp4`;
            GM_download({
                url: dat,
                name: fileName,
                headers:    {
                    "User-Agent": "okhttp"
                },
                onload: setTimeout(() => { downloadBtn.disabled = !1; }, 2000)
            });

        }
        catch(e) { console.log(e); return; }
    }

    function addDownloadButton(videoCardTag) {
        if (document.getElementById('anastasia-i-love-u')) return;

        const downloadBtn = document.createElement('button');
        downloadBtn.innerHTML = '▼';
        downloadBtn.id = 'anastasia-i-love-u';
        if (document.querySelector(".trending-title")) {
            downloadBtn.classList.add('vid_height_add');
        }

        downloadBtn.onclick = () => {
            downloadBtn.disabled = !0;
            const vidId = document.location.href.match(/video\/(6\d+)/i)[1];
            getAPIData(vidId);
        }

        videoCardTag
            .parentNode
            .appendChild(downloadBtn);
    }

    const bodyObserver = new MutationObserver(() => {
        const card = document.querySelector('.video-card-browse > video');
        card && addDownloadButton(card);
    });

    bodyObserver.observe(document.body, {
        childList: !0,
        subtree: !0,
        attributes: !1
    });


})();