// ==UserScript==
// @name Vector Layout for Wikipedia (Fast)
// @namespace -
// @version 1.0.0
// @description returns old wikipedia layout. (layout before 2023 redesign of website)
// @author NotYou
// @match *://wikipedia.org/*
// @match *://*.wikipedia.org/*
// @run-at document-start
// @license GPL-3.0-or-later
// @grant none
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    const IS_DEBUG_MODE = false;
    const DEBUG_TITLE = 'DEBUG - Vector Layout for Wikipedia\n';

    let href = location.href;

    redirect(href);

    window.addEventListener('click', onClick);

    function redirect(inputUrl) {
        let url = typeof inputUrl === 'string' ? new URL(inputUrl) : inputUrl;

        let searchParams = new URLSearchParams(url.search);
        let cleanURL = url.origin + url.pathname;

        if(searchParams.get('useskin') !== 'vector') {
            searchParams.set('useskin', 'vector');

            let hash = location.hash;
            let params = '?' + searchParams.toString();

            if(IS_DEBUG_MODE) {
                console.log(DEBUG_TITLE, cleanURL + params + hash);
            } else {
                location.replace(cleanURL + params + hash);
            }
        }
    }

    function onClick(e) {
        let node = e.target;
        let link = getLink(node);

        if(link) {
            let url = new URL(link.href);
            let isWikiLink = url.hostname.indexOf('wikipedia.org') > -1;

            if(isWikiLink) {
                e.preventDefault();

                redirect(url);
            }
        }
    }

    function getLink(node) {
        if(node.tagName === 'A') {
            return node;
        } else if(node.tagName === 'HTML' || !node.tagName) {
            return null;
        }

        return getLink(node.parentNode);
    }
})();