// ==UserScript==
// @name         Twitter Link Modifier
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Modify newly t.co links to direct URLs on Twitter pages dynamically
// @author       CLDXiang
// @match        https://twitter.com/*
// @grant        none
// @license      MIT
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    // Function to modify a single link
    function modifyLink(link) {
        // Check if the href contains 't.co'
        if (link.href.includes('t.co')) {
            // Replace href with the domain from innerText
            var urlText = link.innerText;
            // Simple check for a valid URL in the innerText
            if (urlText.startsWith('http')) {
                if (urlText.endsWith('…')) {
                    urlText = urlText.slice(0, -1);
                }
                link.href = urlText;
            }
        }
    }

    // Function to observe DOM changes
    function observeDOM() {
        // Options for the observer (which mutations to observe)
        const config = { childList: true, subtree: true };

        // Callback function to execute when mutations are observed
        const callback = function(mutationsList, observer) {
            for (let mutation of mutationsList) {
                if (mutation.type === 'childList') {
                    mutation.addedNodes.forEach(node => {
                        // Check if the added node is an element
                        if (node.nodeType === Node.ELEMENT_NODE) {
                            // Check if it's an <a> tag or contains <a> tags
                            if (node.tagName === 'A') {
                                modifyLink(node);
                            } else {
                                node.querySelectorAll('a').forEach(modifyLink);
                            }
                        }
                    });
                }
            }
        };

        // Create an observer instance linked to the callback function
        const observer = new MutationObserver(callback);

        // Start observing the target node for configured mutations
        observer.observe(document.body, config);
    }

    // Modify existing links and set up the observer
    document.querySelectorAll('a').forEach(modifyLink);
    observeDOM();
})();