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// ==UserScript==
// @name        Invidious Embed
// @namespace   InvidiousEmbed
// @author      Jesús E.
// @license     GPL version 3 or any later version::: https://www.gnu.org/licenses/gpl-3.0.html
// @description Replace YouTube embeds with invidious instance
// @homepageURL https://libregit.spks.xyz/heckyel/book/src/branch/master/scripts-greasemonkey
// @include     *
// @exclude     /^http(s|)://(www[.]|)youtube[.]com/.*$/
// @exclude     /^http(s|)://(www[.]|)invidio[.]us/.*$/
// @exclude     /^http(s|)://(www[.]|proxy[.]|)invidious[.]snopyta[.]org/.*$/
// @exclude     /^http(s|)://(www[.]|)vid[.]wxzm[.]sx/.*$/
// @exclude     /^http(s|)://(www[.]|)invidious[.]kabi[.]tk/.*$/
// @exclude     /^http(s|)://(www[.]|)invidiou[.]sh/.*$/
// @exclude     /^http(s|)://(www[.]|)yewtu[.]be/.*$/
// @exclude     /^http(s|)://(www[.]|)invidious[.]ggc-project[.]de/.*$/
// @exclude     /^http(s|)://(www[.]|)invidious[.]enkirton[.]net/.*$/
// @exclude     /^http(s|)://(www[.]|)tube[.]poal[.]co/.*$/
// @exclude     /^http(s|)://(www[.]|)invidious[.]13ad[.]de/.*$/
// @version     1.0.5
// @grant       none
// ==/UserScript==

let instance = 'invidio.us' // set instance

// Console Style - Debug
const consoleCSS = 'background: #000; color: #00FF00; padding: 0px 7px; border: 1px solid #00FF00; line-height: 16px;';
const name = GM_info.script.name;
const version = GM_info.script.version;
const log = (...args) => console.log('%cUSERSCRIPT | %s %s | %s', consoleCSS, name, version, ...args);

let i, j, k, index;
let video_id, video_url, video_link;

let risky_elements, risky_attributes, risky_node;
let risky_tags = ["object", "embed", "iframe", "div"];

let bad_elements = [];
let bad_ids = [];

for (i = 0; i < risky_tags.length; i++) {
  risky_elements = document.getElementsByTagName(risky_tags[i]);
  for (j = 0; j < risky_elements.length; j++) {
    index = 0;
    risky_attributes = risky_elements[j].attributes;
    for (k = 0; k < risky_attributes.length; k++) {
      risky_node = risky_attributes[k].value;
      if ((risky_node.indexOf("youtube.com") >= 0) || (risky_node.indexOf("ytimg.com") >= 0) || (risky_node.indexOf("youtube-nocookie.com") >= 0)) {
        risky_elements[j].style.display = "none";
        if (risky_node.indexOf("/v/") >= 0) {
          index = risky_node.indexOf("/v/") + 3;
        } else if (risky_node.indexOf("?v=") >= 0) {
          index = risky_node.indexOf("?v=") + 3;
        } else if (risky_node.indexOf("/embed/") >= 0) {
          index = risky_node.indexOf("/embed/") + 7;
        }
        if (index > 0) {
          video_id = risky_node.substring(index, index + 11);
          bad_elements.push(risky_elements[j]);
          bad_ids.push(video_id);
        }
        break;
      }
    }
  }
}

for (i = 0; i < bad_ids.length; i++) {
  video_id = bad_ids[i];
  video_url = "//" + instance + "/embed/" + video_id;
  video_link = document.createElement("iframe");
  video_link.setAttribute("src", video_url);

  // Set the width, if present
  width = bad_elements[i].getAttribute("width");
  if ( width !== null ) {
    video_link.setAttribute("width", width);
  }

  // Set the height, if present
  height = bad_elements[i].getAttribute("height");
  if ( height !== null ) {
    video_link.setAttribute("height", height);
  }

  video_link.setAttribute("frameborder", "0");
  video_link.setAttribute("allowfullscreen", "1");

  bad_elements[i].parentNode.replaceChild(video_link, bad_elements[i]);
}

log('successfully initialized');