Loop Fix

Fixes youtube video repeating when watching in playlist + refreshing page if video stopped downloading
As of 18. 09. 2024. See the latest version.
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// ==UserScript==
// @name         Loop Fix
// @description  Fixes youtube video repeating when watching in playlist + refreshing page if video stopped downloading
// @version      0.1.12
// @author       0vC4
// @namespace    https://greasyfork.org/users/670183
// @match        *://*.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @run-at       document-start
// @license      MIT
// @grant        none
// ==/UserScript==

(() => {
    function blockEvents(condition, ...events) {
        events = events.flat();
        const tag = window.EventTarget.prototype;
        tag._add = tag.addEventListener;
        tag.addEventListener = function (name, callback, options) {
            if (!events.includes(name)) return tag._add.call(this, name, callback, options);

            function cb(e) {
                if (!condition.call(this)) return;
                callback.call(this, e);
            };

            tag._add.call(this, name, cb, options);
        };
    }

    blockEvents(function() {
        return !this.loop; // have loop = block events
    }, 'pause', 'timeupdate', 'waiting');
})();

const log = window.console.log;
window.loopState = localStorage.getItem('loopState') ?? false;
function clicking(e) {
    window.loopState = JSON.parse(this.ariaChecked);
};

let created = false;
let refreshing = false;
let loaded = false;
let oldVid = null;

const maxPing = 500;
const blob = new window.Blob([`setTimeout(() => postMessage(0), ${maxPing});`]);
const workerScript = window.URL.createObjectURL(blob);
const script = window.trustedTypes && window.trustedTypes.createPolicy ? window.trustedTypes.createPolicy('timeout', {createScriptURL: str => str}).createScriptURL(workerScript) : workerScript;

window.setInterval(()=>{
    const vid = window.document.querySelector('video.html5-main-video');
    if (vid) {
        // to prevent false detecting when changing video
        if (vid != oldVid) {
            loaded = false;
            oldVid = vid;
        }

        if (!created) {
            created = true;
            localStorage.removeItem('loopState');

            // refresh if no data for half sec
            const callback = () => {
                if (!loaded && vid.readyState === window.HTMLMediaElement.HAVE_NOTHING) {
                    localStorage.setItem('loopState', window.loopState);
                    window.location.href = window.location.href;
                }
            };
            new window.Worker(script).onmessage = callback;
        }

        // apply loopState after .src or page refresh
        if (vid.loop != window.loopState) vid.loop = window.loopState;

        // to prevent early page refresh
        if (vid.readyState === window.HTMLMediaElement.HAVE_CURRENT_DATA || vid.readyState === window.HTMLMediaElement.HAVE_ENOUGH_DATA) loaded = true;

        const noData = vid.readyState === window.HTMLMediaElement.HAVE_CURRENT_DATA || vid.readyState === window.HTMLMediaElement.HAVE_METADATA;
        let noNewData = +vid.currentTime.toFixed(0) >= +vid.buffered.end(0).toFixed(0) - 2;

        if (loaded && !refreshing && noData && !seeking && !vid.paused && +vid.currentTime.toFixed(0) >= +vid.buffered.end(0).toFixed(0) - 2) {
            localStorage.setItem('loopState', window.loopState);
            window.location.href = window.location.href.split('?')[0] + '?t=' + (+vid.currentTime.toFixed(0) + 1) + '&' + window.location.href.split('?')[1];
            refreshing = true;
        }
    }

    // attach loop click detector
    const repeat = window.document.querySelectorAll('.ytp-menuitem[tabindex="-1"]')[0];
    if (repeat && repeat.onclick != clicking) {
        repeat.onclick = clicking
    }
});