// ==UserScript==
// @name         YT redirect to Invidious on login request
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  Redirects youtube links to invidious instances if youtube requires you to login for geo-blocking or age restriction
// @author       Xynoth
// @match        https://www.youtube.com/watch?*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    // Edit your invidious instance here
    var invidiousInstance = "https://invidio.us";

    // Other variables
    var currentLocation = window.location.href;
    var newLocation = currentLocation.replace("https://www.youtube.com/watch?", invidiousInstance + "/watch?");
    var loginWarning;
    var timedLoop = 0;

    // "Must login" warning container

    var checkExist = setInterval(function() {
        loginWarning = document.querySelector(".ytp-error[role='alert']");
        if (loginWarning) {
            window.location.href = newLocation;
            clearInterval(checkExist);
        } else if (timedLoop >= 5) {
            clearInterval(checkExist);
        }
        timedLoop += 1;
    }, 1000);

})();