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andykhang404 / YouTube video time show

// ==UserScript==
// @name         YouTube video time show
// @namespace    https://github.com/AndyKhang404
// @version      1.0
// @description  Show the current time of the video on the title, so you don't have to periodically switch tabs
// @author       Andy Khang
// @license      MIT
// @match        https://www.youtube.com/watch?*
// @icon         https://www.google.com/s2/favicons?domain=tampermonkey.net
// @grant        none
// ==/UserScript==

/*
Known problem:
 - Sudden changes in playback rate can unsync the script time with the actual video time
*/

(function () {
  'use strict';
  var player = document.getElementById('movie_player');
  var title = document.title;
  var playbackSpeed = 1 / player.getPlaybackRate();
  var itv = function () {
    playbackSpeed = 1 / player.getPlaybackRate();
    var time = Math.round(player.getCurrentTime());
    var second = (time % 60).toString();
    if (second.length < 2) {
      second = "0" + second;
    }
    var minute = (Math.floor(time / 60) % 60).toString();
    if (minute.length < 2) {
      minute = "0" + minute;
    }
    var hour = (Math.floor(time / 3600) % 24).toString();
    var day = (Math.floor(time / 86400)).toString();
    if (hour.length < 2 && day.length != "0") {
      hour = "0" + hour;
    }
    if (hour === "00" && day === "0") {
      document.title = minute + ":" + second + " " + title;
    }
    else if (hour !== "00" && day === "0") {
      document.title = hour + ":" + minute + ":" + second + " " + title;
    }
    else if (day !== "0") {
      document.title = day + ":" + hour + ":" + minute + ":" + second + " " + title;
    }
    setTimeout(itv, 1000 * playbackSpeed);
  };
  setTimeout(itv, 1000 * playbackSpeed);
})();