YouTube Vertical Toggle Videos/Comments

Toggle between "Videos" and "comments" sections on YouTube when screen width less than 1000px, is useful when on a Vertical Screen
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// ==UserScript==
// @name         YouTube Vertical Toggle Videos/Comments
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Toggle between "Videos" and "comments" sections on YouTube when screen width less than 1000px, is useful when on a Vertical Screen
// @author       Nate2898
// @match        *://*.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @license      MIT
// @grant        none
// @namespace    https://gf.qytechs.cn/en/users/1083698
// @downloadURL
// @updateURL
// ==/UserScript==

(function() {
    'use strict';

    // Add CSS to only show the toggle button when screen is < 1000px
    const style = document.createElement('style');
    style.textContent = `
        #toggle-videos-comments-container { display: none !important; }
        @media (max-width: 1000px) {
            #toggle-videos-comments-container { display: flex !important; }
        }
    `;
    document.head.appendChild(style);

    const STATE_KEY = 'ytToggleState';
    const SAVE_ENABLED_KEY = 'ytToggleSaveEnabled';

    // Default save setting: disabled
    if (!localStorage.getItem(SAVE_ENABLED_KEY)) {
        localStorage.setItem(SAVE_ENABLED_KEY, 'false');
    }

    // Save the toggle state (videos or comments) if saving is enabled
    function saveState(isComments) {
        if (!isSaveEnabled()) return;
        try {
            localStorage.setItem(STATE_KEY, isComments ? 'comments' : 'videos');
        } catch {}
    }

    // Load the previously saved toggle state
    function loadState() {
        try {
            return isSaveEnabled() ? localStorage.getItem(STATE_KEY) : null;
        } catch {
            return null;
        }
    }

    // Check if the save setting is enabled
    function isSaveEnabled() {
        try {
            return localStorage.getItem(SAVE_ENABLED_KEY) === 'true';
        } catch {
            return false;
        }
    }

    // Set whether saving is enabled
    function setSaveEnabled(enabled) {
        try {
            localStorage.setItem(SAVE_ENABLED_KEY, enabled ? 'true' : 'false');
        } catch {}
    }

    // Show both videos and comments sections
    function showBoth() {
        ['#related', '#comments'].forEach(sel => {
            const el = document.querySelector(sel);
            if (el) el.style.display = '';
        });
    }

    // Apply the saved toggle state to show either comments or videos
    function applyState() {
        const state = loadState();
        const videos = document.querySelector('#related');
        const comments = document.querySelector('#comments');
        const toggle = document.querySelector('#toggle-videos-comments-container input[type=checkbox].main-toggle');
        if (!videos || !comments || !toggle) return;
        const showComments = (state === 'comments');
        videos.style.display = showComments ? 'none' : '';
        comments.style.display = showComments ? '' : 'none';
        toggle.checked = showComments;
        toggle.dispatchEvent(new Event('change'));
    }

    // Create the toggle button UI and checkbox
    function createToggleButton() {
        if (document.querySelector('#toggle-videos-comments-container')) return;

        const container = document.createElement('div');
        container.id = 'toggle-videos-comments-container';
        Object.assign(container.style, {
            display: 'flex',
            flexDirection: 'row',
            alignItems: 'center',
            margin: '5px 0',
            justifyContent: 'center',
            gap: '10px'
        });

        // Add "Remember toggle" checkbox
        const saveCheckbox = document.createElement('input');
        saveCheckbox.type = 'checkbox';
        saveCheckbox.checked = isSaveEnabled();
        saveCheckbox.title = 'Remember toggle between sessions';
        saveCheckbox.addEventListener('change', () => {
            setSaveEnabled(saveCheckbox.checked);
        });

        // Add label text next to the toggle
        const label = document.createElement('div');
        label.textContent = 'Videos/Comments';
        Object.assign(label.style, {
            fontSize: '16px',
            fontWeight: 'bold',
            color: '#FFF'
        });

        // Create the toggle switch
        const sliderLabel = document.createElement('label');
        Object.assign(sliderLabel.style, {
            position: 'relative',
            display: 'inline-block',
            width: '60px',
            height: '20px'
        });

        const input = document.createElement('input');
        input.classList.add('main-toggle');
        input.type = 'checkbox';
        input.style.opacity = '0';
        input.style.width = '0';
        input.style.height = '0';
        input.addEventListener('change', () => {
            const videos = document.querySelector('#related');
            const comments = document.querySelector('#comments');
            if (!videos || !comments) return;
            if (input.checked) {
                videos.style.display = 'none';
                comments.style.display = '';
                saveState(true);
            } else {
                videos.style.display = '';
                comments.style.display = 'none';
                saveState(false);
            }
        });

        // Style the toggle track and thumb
        const track = document.createElement('span');
        Object.assign(track.style, {
            position: 'absolute',
            cursor: 'pointer',
            top: '0',
            left: '0',
            right: '0',
            bottom: '0',
            backgroundColor: '#fc0703', //Video slider color
            transition: '0.4s',
            borderRadius: '20px'
        });

        const thumb = document.createElement('span');
        Object.assign(thumb.style, {
            position: 'absolute',
            height: '15px',
            width: '15px',
            left: '4px',
            bottom: '3px',
            backgroundColor: '#FFF', // Slider dot color
            transition: '0.4s',
            borderRadius: '50%'
        });

        // Update appearance when toggle changes
        input.addEventListener('change', () => {
            if (input.checked) {
                track.style.backgroundColor = '#2196F3';  //Comments slider color
                thumb.style.transform = 'translateX(36px)';
            } else {
                track.style.backgroundColor = '#fc0703';  //Video slider color
                thumb.style.transform = 'translateX(0)';
            }
        });

        track.appendChild(thumb);
        sliderLabel.appendChild(input);
        sliderLabel.appendChild(track);

        // Append all elements to the container
        container.appendChild(saveCheckbox);
        container.appendChild(label);
        container.appendChild(sliderLabel);

        // Insert the toggle below the main video content
        const above = document.querySelector('#above-the-fold');
        if (above) above.insertAdjacentElement('afterend', container);

        // Apply toggle state if small screen
        if (window.matchMedia('(max-width: 1000px)').matches) applyState();
    }

    // Observe for page changes and create toggle accordingly
    let currentUrl = location.href;
    const observer = new MutationObserver(() => {
        if (location.href !== currentUrl) {
            currentUrl = location.href;
            handleUrlChange();
        }
        createToggleButton();
    });

    // Clean up and reset when navigating
    function handleUrlChange() {
        const old = document.querySelector('#toggle-videos-comments-container');
        if (old) old.remove();
        showBoth();
        createToggleButton();
    }

    observer.observe(document.body, { childList: true, subtree: true });

    // Re-apply state when resizing below 1000px
    window.matchMedia('(max-width: 1000px)').addEventListener('change', e => {
        if (e.matches) applyState();
        else showBoth();
    });
})();
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