Reddit Image Gallery Arrow Navigation

Navigate Reddit image galleries using arrow keys, made with the help of ChatGPT, Thanks ChatGPT!
ياردەم ئۈچۈن ئاپتورنىڭ بېتىنى زىيارەت قىلىش، سوئال سوراش، ئوبزور يېزىش ياكى قوليازمىنى پاش قىلىش.
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// ==UserScript==
// @name         Reddit Image Gallery Arrow Navigation
// @namespace    https://reddit.com
// @version      1.9.2
// @description  Navigate Reddit image galleries using arrow keys, made with the help of ChatGPT, Thanks ChatGPT!
// @author       TheFantasticLoki
// @match        https://*.reddit.com/*
// @grant        none
// @license      MIT
// @homepage     https://github.com/TheFantasticLoki/Tampermonkey-Scripts
// @homepageURL  https://github.com/TheFantasticLoki/Tampermonkey-Scripts
// @supportURL   https://github.com/TheFantasticLoki/Tampermonkey-Scripts/issues
// ==/UserScript==

(function () {
    'use strict';

    // Set the debug variable to control logging
    const debug = false;

    let activeGallery = null;

    const simulateClick = (button) => {
        if (button) {
            try {
                const event = new MouseEvent('click', {
                    bubbles: true,
                    cancelable: true,
                    view: window,
                });
                button.dispatchEvent(event);
                if (debug) console.log('Dispatched click event successfully');
            } catch (err) {
                if (debug) console.error('Error dispatching click event:', err);
            }
        } else {
            if (debug) console.log('Button not interactable or not found.');
        }
    };

    const handleKeyDown = (e) => {
        if (document.activeElement.tagName === 'INPUT' || document.activeElement.tagName === 'TEXTAREA') {
            return;
        }

        if (!activeGallery) {
            if (debug) console.log('No active gallery to navigate.');
            return;
        }

        if (e.key === 'ArrowLeft') {
            if (debug) console.log('Left arrow pressed');
            const prevButton = activeGallery.querySelector('button[aria-label="Previous page"]');
            if (debug) console.log('Previous Button:', prevButton);
            simulateClick(prevButton);
        }

        if (e.key === 'ArrowRight') {
            if (debug) console.log('Right arrow pressed');
            const nextButton = activeGallery.querySelector('button[aria-label="Next page"]');
            if (debug) console.log('Next Button:', nextButton);
            simulateClick(nextButton);
        }
    };

    const handleMouseEnter = (e) => {
        const galleryCarousel = e.currentTarget;
        if (galleryCarousel && galleryCarousel.shadowRoot) {
            activeGallery = galleryCarousel.shadowRoot;
            if (debug) console.log('Mouse entered gallery-carousel. Active gallery set:', activeGallery);
        }
    };

    const handleMouseLeave = () => {
        activeGallery = null;
        if (debug) console.log('Mouse left gallery-carousel. Active gallery cleared.');
    };

    const detectPopup = () => {
        const lightbox = document.querySelector('#shreddit-media-lightbox');
        if (lightbox) {
            const gallery = lightbox.querySelector('gallery-carousel');
            if (gallery && gallery.shadowRoot) {
                activeGallery = gallery.shadowRoot;
                if (debug) console.log('Gallery popup detected. Active gallery set:', activeGallery);
            }
        }
    };

    const observeDOMChanges = () => {
        const observer = new MutationObserver((mutations) => {
            mutations.forEach((mutation) => {
                if (mutation.addedNodes) {
                    mutation.addedNodes.forEach((node) => {
                        if (node.id === 'shreddit-media-lightbox') {
                            if (debug) console.log('Lightbox detected:', node);
                            detectPopup();
                        }
                    });
                }
            });
        });

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

    const attachHoverListeners = () => {
        document.querySelectorAll('gallery-carousel').forEach((carousel) => {
            carousel.addEventListener('mouseenter', handleMouseEnter);
            carousel.addEventListener('mouseleave', handleMouseLeave);
        });
    };

    const observeFeed = () => {
        const feedObserver = new MutationObserver(() => {
            attachHoverListeners(); // Reattach listeners as new galleries load
        });

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

    // Initial setup
    document.addEventListener('keydown', handleKeyDown);
    observeDOMChanges();
    observeFeed();

    // Attach listeners for initial galleries
    attachHoverListeners();

    if (debug) console.log('Script initialized.');
})();