YouTube Comment Toggle

Hides or shows the comment section per channel with a dedicated toggle button.
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// ==UserScript==
// @name         YouTube Comment Toggle
// @name:ja      YouTube コメント欄トグル (チャンネル別設定保存)
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Hides or shows the comment section per channel with a dedicated toggle button.
// @description:ja チャンネルごとにコメント欄の表示・非表示を切り替え、設定を保存します。
// @author       tac-tac-go
// @match        https://www.youtube.com/watch*
// @license      MIT
// @grant        GM_setValue
// @grant        GM_getValue
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    // ★ Default Blacklist: Add channel handles (e.g., '/@handle') to hide by default.
    const defaultBlacklist = ['/@official_channel_id'];
    let sessionBlacklist = GM_getValue('commentBlacklist', []);
    let blacklist = Array.from(new Set([...defaultBlacklist, ...sessionBlacklist]));

    // ■ 1. Define Persistent Hidden Style
    // When the "yt-comments-hidden" class is present on the html tag, 
    // the comment section is strictly hidden regardless of YouTube's internal UI updates.
    const css = `
        html.yt-comments-hidden #comments,
        html.yt-comments-hidden ytd-comments {
            display: none !important;
        }
    `;
    
    if (typeof GM_addStyle !== 'undefined') {
        GM_addStyle(css);
    } else {
        const style = document.createElement('style');
        style.textContent = css;
        document.head.appendChild(style);
    }

    // ■ 2. Helper to fetch the current channel's handle
    const getChannelHandle = () => {
        const link = document.querySelector('#owner ytd-video-owner-renderer a.yt-simple-endpoint') || 
                     document.querySelector('#upload-info ytd-video-owner-renderer a.yt-simple-endpoint');
        return link ? link.getAttribute('href') : null;
    };

    // ■ 3. Main Logic
    const updateUI = () => {
        const handle = getChannelHandle();
        if (!handle) return;

        const isBlacklisted = blacklist.includes(handle);
        const htmlTag = document.documentElement;

        // --- A. Sync Visibility (CSS Class) ---
        if (isBlacklisted) {
            if (!htmlTag.classList.contains('yt-comments-hidden')) {
                htmlTag.classList.add('yt-comments-hidden');
            }
        } else {
            if (htmlTag.classList.contains('yt-comments-hidden')) {
                htmlTag.classList.remove('yt-comments-hidden');
            }
        }

        // --- B. Sync Toggle Button ---
        const ownerContainer = document.querySelector('#owner');
        if (!ownerContainer) return;

        let btn = ownerContainer.querySelector('#toggle-comment-btn');
        const btnText = isBlacklisted ? '📢 Show Comments' : '🔇 Hide Comments';

        if (!btn) {
            btn = document.createElement('button');
            btn.id = 'toggle-comment-btn';
            btn.style.cssText = `
                display: inline-flex; align-items: center; margin-left: 12px; padding: 0 16px; 
                height: 36px; border-radius: 18px; border: none; cursor: pointer; 
                font-size: 14px; font-weight: 500; 
                background-color: var(--yt-spec-badge-chip-background, rgba(255, 255, 255, 0.1)); 
                color: var(--yt-spec-text-primary, white); 
                white-space: nowrap; vertical-align: middle;
            `;
            
            btn.onclick = (e) => {
                e.preventDefault();
                const currentHandle = getChannelHandle();
                if (!currentHandle) return;

                if (blacklist.includes(currentHandle)) {
                    blacklist = blacklist.filter(id => id !== currentHandle);
                } else {
                    blacklist.push(currentHandle);
                }
                GM_setValue('commentBlacklist', blacklist);
                updateUI();
            };
            
            ownerContainer.appendChild(btn);
        }

        // Update button text if it doesn't match the current state
        if (btn.innerText !== btnText) {
            btn.innerText = btnText;
        }
    };

    // ■ 4. Triggering
    setInterval(updateUI, 500);
    window.addEventListener('yt-navigate-finish', updateUI);
})();