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rainer.adelstonegmail.com / Youtube enhancer

// ==UserScript==
// @name        Youtube enhancer
// @namespace   youtube.com
// @version     1.1.2
// @match       https://*.youtube.com/watch*
// @license     MIT
// ==/UserScript==

let listenerIsSet   = false;
let manualPause     = false;
let videoSrc        = "";
let startTime       = Date.now();
let startTimeOffset = 0;
let elapsedTime     = 0.0;
let pausedTime      = 0.0;
let jumps           = 0;

(function ()
{
	let manualPause     = false;
	let videoSrc        = '';
	let startTime       = Date.now();
	let startTimeOffset = 0;
	let elapsedTime     = 0.0;
	let pausedTime      = 0.0;
	let jumps           = 0;
	let freqCounterLast = 0;

	const initializationInterval =
			  setInterval(() =>
						  {
							  const video = document.querySelector('video');

							  if (video)
							  {
								  clearInterval(initializationInterval);
								  registerKeyDownListener();
								  startPlaybackTracking();
							  }
						  }, 120);

	const registerKeyDownListener = () =>
	{
		document.addEventListener('keydown', event =>
		{
			if (event.keyCode === 19 || event.keyCode === 32 || event.keyCode === 75)
			{
				manualPause = !manualPause;
			}
		});
	};

	const startPlaybackTracking = () =>
	{
		setInterval(() =>
					{
						const video = document.querySelector('video');

						if (videoSrc === video.currentSrc)
						{
							/*video cannot be played => prevent the reset of the playback*/
							if (video.readyState < 3)
							{
								pausedTime = Date.now() - (startTime + elapsedTime);

								if (jumps !== video.played.length)
								{
									startTime         = Date.now();
									video.currentTime = Math.round((elapsedTime + startTimeOffset) / 1000);
								}
							}

							/*video can be played => track the playback time*/
							if (video.readyState > 2)
							{
								if (video.paused)
								{
									pausedTime = Date.now() - (startTime + elapsedTime);
								}
								else if (jumps === video.played.length)
								{
									elapsedTime = Date.now() - (startTime + pausedTime);
								}
								else
								{
									jumps           = video.played.length;
									freqCounterLast = 0;
									elapsedTime     = 0.0;
									pausedTime      = 0.0;
									startTime       = Date.now();
									startTimeOffset = Math.round(video.currentTime * 1000);
								}
							}
						}
						else //initial load
						{
							videoSrc        = video.currentSrc;
							jumps           = 0;
							freqCounterLast = 0;
							elapsedTime     = 0.0;
							pausedTime      = 0.0;
							startTime       = Date.now();
							startTimeOffset = Math.round(video.currentTime * 1000);
						}
						
						let freqCounterActual = Math.floor((elapsedTime + pausedTime) / 1000);
						
						if (!manualPause && freqCounterLast !== freqCounterActual)
						{
							freqCounterLast = freqCounterActual;

							const wrapperClassList = document.querySelector('.html5-video-player').classList;

							if (wrapperClassList.contains('paused-mode') ||
								(wrapperClassList.contains('unstarted-mode') && jumps) ||
								(wrapperClassList.contains('unstarted-mode') && /&index=\d+/.test(window.location.href)))
							{
								video.click();
							}
						}

					}, 240);
	};
})();