// ==UserScript==
// @name     MS-Docs Language-Toggle
// @version  1
// @grant    none
// @include  https://learn.microsoft.com/*
// ==/UserScript==

const localLang = "de-DE";
const defaultLang = "en-US";

if (document.location.pathname.toLowerCase().startsWith(`/${localLang.toLowerCase()}/`)) {
  addLangButton(localLang, defaultLang);
} else if (document.location.pathname.toLowerCase().startsWith(`/${defaultLang.toLowerCase()}/`)) {
  addLangButton(defaultLang, localLang);
}

function addLangButton(origLang, targetLang) {
	const switchLangButton = document.createElement("A");
  switchLangButton.innerText = targetLang.toUpperCase();
  switchLangButton.href = `/${targetLang}/${document.location.pathname.substr(`/${origLang}/`.length)}`;
  switchLangButton.className = "button button-sm button-primary button-filled";
  switchLangButton.style = "position: fixed; margin: 10px; bottom: 0; right: 0;";
  document.body.appendChild(switchLangButton);
}