Youtube Special Comment Sticker Tapermonkey

// ==UserScript==
// @name         Youtube Special Comment Sticker
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @include https://www.youtube.com/live_chat*
// @grant        none
// ==/UserScript==

(() => {
    let IS_DARK = document.querySelector('html').hasAttribute('dark');

    let canScroll = true;
    let chat;
    let itemScroller;
    let scrollButton;
    let sticky;
    let stickyItems;
    let stickyItemsContainer;
    let toggleSticky;
    let toggleStickyText;

    let scrollSticky = () => {
        if (canScroll) {
            stickyItems.scrollTop = stickyItems.scrollHeight;
        }
    }

    let isSpecial = (authorElement) => {
        return authorElement.classList.contains('moderator') || authorElement.classList.contains('owner');
    };

    let stickItem = (node) => {
        let authorElement = node.querySelector('#author-name');
        if (authorElement && isSpecial(authorElement)) {
            let stickyItem = document.createElement('div');
            let authorPhoto = document.createElement('div');
            let content = document.createElement('div');
            let timestamp = document.createElement('span');
            let author = document.createElement('div');
            let authorName = document.createElement('span');
            content.id = 'content';
            stickyItem.classList.add('sticky-item');
            content.classList.add('style-scope', 'yt-live-chat-text-message-renderer');
            timestamp.classList.add('timestamp');
            author.classList.add('author');
            authorName.classList.add('author-name');
            authorElement.classList.contains('owner') ? authorName.classList.add('owner') : null;
            authorPhoto.innerHTML = node.querySelector('#author-photo').outerHTML.replace(/(\<|\/)(yt\-img\-shadow)/g, '$1div');
            timestamp.innerText = node.querySelector('#timestamp').innerText;
            authorName.innerText = authorElement.innerText;
            author.append(authorName);
            content.append(timestamp);
            content.append(author);
            content.append(node.querySelector('#message').cloneNode(true));
            stickyItem.append(authorPhoto.firstChild);
            stickyItem.append(content);
            stickyItems.append(stickyItem);

            if (sticky.style.display === 'none') {
                chat = document.querySelector('#chat');
                itemScroller = chat.querySelector('#item-scroller');
                sticky.style.display = 'inherit';
                chat.setAttribute('style', `max-height: ${chat.offsetHeight - sticky.offsetHeight}px;`);
                itemScroller.scrollTop = itemScroller.scrollHeight;
            }

            scrollSticky();
        }
    };

    let monitor = () => {
        let chatItems = document.querySelector('#items.style-scope.yt-live-chat-item-list-renderer');
        let observer = new MutationObserver((mutations) => {
            mutations.forEach((mutation) => {
                mutation.addedNodes.forEach(stickItem);
            });
        });
        chatItems.querySelectorAll('yt-live-chat-text-message-renderer').forEach(stickItem);
        observer.observe(chatItems, { childList: true });
    };

    let setUpCss = () => {
        let style = document.createElement('style');
        document.head.appendChild(style);
        style.sheet.insertRule('#sticky {position: relative;}');
        style.sheet.insertRule('#sticky #show-hide-button {border-bottom: #e0e0e0 solid 1px; font-size: 11px;}');
        style.sheet.insertRule('#sticky #show-hide-button div {font-size: 11px;}');
        style.sheet.insertRule('#sticky #show-hide-button div a {color: #11111199; display: flex;}');
        style.sheet.insertRule('#sticky #show-hide-button div a:hover {color: #030303;}');
        style.sheet.insertRule('#sticky #show-hide-button div a #button {border-radius: 0; margin: 0; padding: 8px 24px; width: 100%;}');
        style.sheet.insertRule('#sticky #show-hide-button div a #button #text {font-weight: 500;}');
        style.sheet.insertRule('#sticky #chat-header {box-sizing: border-box; display: flex; border-bottom: #e0e0e0 solid 1px; background-color: #fffffffa; height: 150px; padding: 0 0 0 4px; transition: all .15s cubic-bezier(0.0, 0.0, 0.2, 1);}');
        style.sheet.insertRule('#sticky yt-icon-button {z-index: 0; transition: all .15s cubic-bezier(0.0, 0.0, 0.2, 1); visibility: hidden;}');
        style.sheet.insertRule('#sticky #primary-content {height: inherit; overflow-x: hidden;}');
        style.sheet.insertRule('#sticky #primary-content::-webkit-scrollbar {content: "";}');
        style.sheet.insertRule('#sticky #primary-content::-webkit-scrollbar-track {background-color: #f1f1f1;}');
        style.sheet.insertRule('#sticky #primary-content::-webkit-scrollbar-thumb {border: 2px solid #f1f1f1; min-height: 30px;}');
        style.sheet.insertRule('#sticky #primary-content .sticky-item {padding: 4px; font-size: 13px; display: flex;}');
        style.sheet.insertRule('#sticky #primary-content .sticky-item #author-photo {display: inline-table;}');
        style.sheet.insertRule('#sticky #primary-content .sticky-item #img {max-width: inherit;}');
        style.sheet.insertRule('#sticky #primary-content .timestamp {display: inline; color: #11111166; font-size: 11px; margin-right: 8px;}');
        style.sheet.insertRule('#sticky #primary-content .author {display: inline-flex; margin-right: 8px;}');
        style.sheet.insertRule('#sticky #primary-content .author .author-name {color: #5f84f1; font-weight: 500;}');
        style.sheet.insertRule('#sticky #primary-content .author .author-name.owner {color: #000000de; background-color: #ffd600; padding: 2px 4px; border-radius: 2px;}');
        style.sheet.insertRule('#sticky #primary-content #message {display: inline; line-height: 17px;}');
        style.sheet.insertRule('#sticky.dark #show-hide-button {border-color: #303030; background-color: #181818;}');
        style.sheet.insertRule('#sticky.dark #show-hide-button div a {color: #ffffffb3;}');
        style.sheet.insertRule('#sticky.dark #show-hide-button div a:hover {color: #ffffff;}');
        style.sheet.insertRule('#sticky.dark #chat-header {border-color: #303030; background-color: #202020;}');
        style.sheet.insertRule('#sticky.dark #primary-content::-webkit-scrollbar-track {background-color: #0f0f0f;}');
        style.sheet.insertRule('#sticky.dark #primary-content::-webkit-scrollbar-thumb {background-color: hsla(0, 0%, 53.3%, .2); border-color: #0f0f0f;');
        style.sheet.insertRule('#sticky.dark #primary-content .timestamp {color: #ffffff8a;}');
        style.sheet.insertRule('#sticky.dark #primary-content .author .author-name {color: #5e84f1;}');
        style.sheet.insertRule('#sticky.dark #primary-content .author .author-name.owner {color: #111111;}');
        style.sheet.insertRule('#sticky.hide-timestamps #primary-content .timestamp {display: none;}');
    };

    let setUpSticky = () => {
        let hideTimestamp = document.querySelector('yt-live-chat-renderer').hasAttribute('hide-timestamps');
        let stickyAnchor = document.querySelector('yt-live-chat-app');
        sticky = document.createElement('div');

        sticky.id = 'sticky';
        sticky.setAttribute('class', `style-scope ytd-watch-flexy ${IS_DARK ? 'dark' : ''} ${hideTimestamp ? 'hide-timestamps': ''}`);
        sticky.style.display = 'none';
        sticky.innerHTML = '<div id="show-hide-button" class="style-scope ytd-live-chat-frame"><div class="style-scope ytd-live-chat-frame" use-keyboard-focused="" is-paper-button="" button-renderer="true"><a class="yt-simple-endpoint style-scope ytd-toggle-button-renderer" tabindex="-1"><paper-button id="button" class="style-scope ytd-toggle-button-renderer" role="button" tabindex="0" animated="" elevation="0" aria-disabled="false"><yt-formatted-string id="text" class="style-scope ytd-toggle-button-renderer"></yt-formatted-string><paper-ripple class="style-scope paper-button"><div id="background" class="style-scope paper-ripple"></div><div id="waves" class="style-scope paper-ripple"></div></paper-ripple></paper-button></a></div></div>'
        sticky.innerHTML += '<div id="chat-header" role="heading" class="style-scope yt-live-chat-renderer"><div id="primary-content" class="style-scope yt-live-chat-header-renderer"></div>';
        sticky.innerHTML += '<yt-icon-button id="show-more" class="style-scope yt-live-chat-item-list-renderer" style="transform: translateY(42px);"><button id="button" class="style-scope yt-icon-button"><button id="button" class="style-scope yt-icon-button" aria-label="More comments below"><yt-icon icon="down_arrow" class="style-scope yt-live-chat-item-list-renderer"><svg viewBox="0 0 24 24" preserveAspectRatio="xMidYMid meet" focusable="false" class="style-scope yt-icon" style="pointer-events: none; display: block; width: 100%; height: 100%;"><g class="style-scope yt-icon"><path d="M20 12l-1.41-1.41L13 16.17V4h-2v12.17l-5.58-5.59L4 12l8 8 8-8z" class="style-scope yt-icon"></path></g></svg></yt-icon></button></button><paper-ripple class="style-scope yt-icon-button circle"><div id="background" class="style-scope paper-ripple" style="opacity: 0.006272;"></div><div id="waves" class="style-scope paper-ripple"></div></paper-ripple></yt-icon-button>'
        stickyItemsContainer = sticky.querySelector('#chat-header');
        toggleSticky = sticky.querySelector('#show-hide-button');
        toggleStickyText = toggleSticky.querySelector('#text');
        scrollButton = sticky.querySelector('yt-icon-button');
        scrollButton.querySelector('#button').style.height = 'auto';

        stickyAnchor.parentNode.insertBefore(sticky, stickyAnchor);
        stickyAnchor.style.position = 'relative';
        toggleStickyText.innerText = 'Hide Sticky';

        sticky.querySelectorAll('#title, #view-selector, #action-buttons, #overflow').forEach(element => element.parentNode.removeChild(element));
        stickyItems = sticky.querySelector('#primary-content');
    };

    let monitorDarkTheme = () => {
        let observer = new MutationObserver(() => {
            sticky.classList.toggle('dark');
        });
        observer.observe(document.querySelector('html'), {
            attributes: true,
            attributeFilter: ['dark']
        });
    };

    let monitorTimestampToggle = () => {
        let observer = new MutationObserver(() => {
            sticky.classList.toggle('hide-timestamps');
            scrollSticky();
        });
        observer.observe(document.querySelector('yt-live-chat-renderer'), {
            attributes: true,
            attributeFilter: ['hide-timestamps']
        });
    };

    let setUpEvents = () => {
        stickyItems.addEventListener('scroll', () => {
            setTimeout(() => {
                canScroll = stickyItems.scrollHeight - stickyItems.scrollTop === stickyItems.clientHeight;
                scrollButton.style.transform = `translateY(${canScroll ? 42 : 0}px)`;
                scrollButton.style.visibility = canScroll ? 'hidden' : 'visible';
            });
        });
        scrollButton.addEventListener('click', () => {
            canScroll = true;
            stickyItems.scrollTop = stickyItems.scrollHeight;
        });
        toggleSticky.addEventListener('click', () => {
            if (stickyItemsContainer.offsetHeight > 0) {
                chat.setAttribute('style', `max-height: ${chat.offsetHeight + 150}px;`);
                toggleStickyText.innerText = 'Show Sticky';
                stickyItemsContainer.setAttribute('style', 'border: none;');
                stickyItemsContainer.style.height = '0px';
            } else {
                chat.setAttribute('style', `max-height: ${chat.offsetHeight - 150}px;`);
                itemScroller.scrollTop += 150;
                toggleStickyText.innerText = 'Hide Sticky';
                stickyItemsContainer.setAttribute('style', '');
                stickyItemsContainer.style.height = '150px';
            }
        });
    };

    let initMonitoring = () => {
        setUpCss();
        setUpSticky();
        monitor();
        monitorDarkTheme();
        monitorTimestampToggle();
        setUpEvents();
    };

    let init = () => {
        if (window.top.document.readyState === 'complete') {
            initMonitoring();
        } else {
            window.top.addEventListener('load', initMonitoring);
        }
    };

    init();

})();