// ==UserScript==
// @name        YouTube - YouTube to Invidious
// @namespace   youtube-to-invidious
// @match        *://*.youtube.com/*
// @version     1
// @grant       none
// ==/UserScript==

var invidiousInstance = "https://invidio.xamh.de"

var toYouTube = function() {
  sessionStorage.setItem("yti-visityt",true)
  location.reload()
}

var main = function() {
  if (sessionStorage.getItem("yti-visityt") !== null) {
    sessionStorage.removeItem("yti-visityt")
    return
  }
  document.body.innerHTML = `
<center style="background-color: rgba(0,0,0,0.5); color: white; width: 100%; height: 100%">
<h1>YouTube to Invidious</h1>
<a href="` +invidiousInstance + window.location.pathname + window.location.search + window.location.hash + `"><button>To Invidious (recommended)</button></a> <button id="toYouTube">To YouTube</button><br>
Should Invidious not work, click "Back" in your browser, and then choose "To YouTube"<br>
<br>
<i>To get back to this site:</i><br>
<b>From Invidious:</b> Click "Watch on YouTube" or click a YouTube-icon<br>
<b>From YouTube:</b> Reload page
</center>
`
  document.getElementById("toYouTube").onclick = toYouTube
}

main()