YouTube Auto-Resume

This script automatically tracks and restores your YouTube playback position. This user script remembers where you left off in any video—allowing you to seamlessly continue watching even after navigating away or reloading the page. It saves your progress for each video for up to 30 days (configurable) and automatically cleans up outdated entries, ensuring a smooth and uninterrupted viewing experience every time.
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// ==UserScript==
// @name                YouTube Auto-Resume
// @icon                https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @author              ElectroKnight22
// @namespace           electroknight22_youtube_auto_resume_namespace
// @version             1.5.2
// @match               *://www.youtube.com/*
// @match               *://www.youtube-nocookie.com/*
// @exclude             *://music.youtube.com/*
// @exclude             *://studio.youtube.com/*
// @grant               GM.getValue
// @grant               GM.setValue
// @grant               GM.deleteValue
// @grant               GM.listValues
// @grant               GM_getValue
// @grant               GM_setValue
// @grant               GM_deleteValue
// @grant               GM_listValues
// @license             MIT
// @description         This script automatically tracks and restores your YouTube playback position. This user script remembers where you left off in any video—allowing you to seamlessly continue watching even after navigating away or reloading the page. It saves your progress for each video for up to 30 days (configurable) and automatically cleans up outdated entries, ensuring a smooth and uninterrupted viewing experience every time.
// @homepage            https://gf.qytechs.cn/scripts/526798-youtube-auto-resume

// ==/UserScript==

/*jshint esversion: 11 */

(function () {
    "use strict";

    let useCompatibilityMode = false;
    let isIFrame = false;

    const activeHandlers = new WeakMap();

    const daysToRemember = 30;
    const daysToRememberShorts = 1;
    const daysToRememberPreviews = 30 / (24 * 60); // 30 minutes

    const GMCustomGetValue = useCompatibilityMode ? GM_getValue : GM.getValue;
    const GMCustomSetValue = useCompatibilityMode ? GM_setValue : GM.setValue;
    const GMCustomDeleteValue = useCompatibilityMode ? GM_deleteValue : GM.deleteValue;
    const GMCustomListValues = useCompatibilityMode ? GM_listValues : GM.listValues;

    async function resumePlayback(playerApi, videoId, videoElement) {
        try {
            const playbackStatus = await GMCustomGetValue(videoId);
            const lastPlaybackTime = playbackStatus?.timestamp;
            if (!lastPlaybackTime) return;

            const currentPlaybackTime = playerApi.getCurrentTime();

            if (Math.abs(currentPlaybackTime - lastPlaybackTime) > 1) {
                await new Promise(resolve => {
                    const onSeeked = () => {
                        clearTimeout(seekTimeout);
                        resolve();
                    };
                    const seekTimeout = setTimeout(() => {
                        videoElement.removeEventListener('seeked', onSeeked);
                        resolve(); // Resolve even on timeout to prevent getting stuck
                    }, 1000);

                    videoElement.addEventListener('seeked', onSeeked, { once: true });
                    playerApi.seekTo(lastPlaybackTime, true, { skipBufferingCheck: true });
                });
            }
        } catch (error) {
            console.error(`Failed to resume playback: ${error}`);
            throw error;
        }
    }

    function updatePlaybackStatus(playerApi, videoElement, videoType) {
        try {
            const liveVideoId = playerApi.getVideoData()?.video_id;
            if (!liveVideoId) return;

            const videoDuration = videoElement.duration;
            const currentPlaybackTime = videoElement.currentTime;
            const timeLeft = videoDuration - currentPlaybackTime;
            if (isNaN(timeLeft)) return;
            if (timeLeft < 1) {
                GMCustomDeleteValue(liveVideoId);
                return;
            }
            const currentPlaybackStatus = {
                timestamp: currentPlaybackTime,
                lastUpdated: Date.now(),
                videoType: videoType
            };
            GMCustomSetValue(liveVideoId, currentPlaybackStatus);
        } catch (error) {
            console.error(`Failed to update playback status: ${error}`);
        }
    }

    function processVideo(playerContainer, playerApi, videoElement) {
        try {
            activeHandlers.get(playerContainer)?.cleanup();

            const initialVideoId = new URL(window.location.href).searchParams.get('v') || playerApi.getVideoData()?.video_id;
            if (!initialVideoId) return;

            const isPreview = playerContainer.id === 'inline-player';
            const isLive = playerApi.getVideoData().isLive;
            const timeSpecified = new URL(window.location.href).searchParams.has('t');
            const inPlaylist = new URL(window.location.href).searchParams.has('list');
            const playlistType = new URLSearchParams(window.location.search).get('list');

            if (isLive || timeSpecified || (inPlaylist && playlistType !== 'WL')) return;

            let videoType = 'regular';
            if (isPreview) {
                videoType = 'preview';
            } else if (window.location.pathname.startsWith('/shorts/')) {
                videoType = 'short';
            }

            let hasAttemptedResume = false;
            const timeUpdateHandler = async () => {
                if (!hasAttemptedResume) {
                    hasAttemptedResume = true;
                    await resumePlayback(playerApi, initialVideoId, videoElement);
                } else {
                    updatePlaybackStatus(playerApi, videoElement, videoType);
                }
            };

            videoElement.addEventListener('timeupdate', timeUpdateHandler, true);

            activeHandlers.set(playerContainer, {
                cleanup: () => videoElement.removeEventListener('timeupdate', timeUpdateHandler, true)
            });

        } catch (error) {
            console.error(`Failed to process video elements: ${error}`);
        }
    }

    function handleVideoLoad(event) {
        const playerContainer = event.target;
        const playerApi = playerContainer?.player_;
        const videoElement = playerContainer?.querySelector('video');

        if (playerContainer && playerApi && videoElement) {
            processVideo(playerContainer, playerApi, videoElement);
        }
    }

    function handleInitialLoad() {
        const playerContainer = document.querySelector('#movie_player');
        if (playerContainer) {
            const videoElement = playerContainer.querySelector('video');
            if (!videoElement) return;
            const playerApi = playerContainer;
            processVideo(playerContainer, playerApi, videoElement);
        }
    }

    async function cleanUpStoredPlaybackStatuses() {
        try {
            const videoIds = await GMCustomListValues();
            for (const videoId of videoIds) {
                const storedPlaybackStatus = await GMCustomGetValue(videoId);
                if (!storedPlaybackStatus || isNaN(storedPlaybackStatus.lastUpdated)) {
                    await GMCustomDeleteValue(videoId);
                    continue;
                }
                const videoType = storedPlaybackStatus.videoType || 'regular';
                let daysToExpire;
                switch (videoType) {
                    case 'short': daysToExpire = daysToRememberShorts; break;
                    case 'preview': daysToExpire = daysToRememberPreviews; break;
                    default: daysToExpire = daysToRemember; break;
                }
                const threshold = daysToExpire * 86400 * 1000;
                if (Date.now() - storedPlaybackStatus.lastUpdated > threshold) {
                    await GMCustomDeleteValue(videoId);
                }
            }
        } catch (error) {
            console.error(`Failed to clean up stored playback statuses: ${error}`);
        }
    }

    function hasGreasyMonkeyAPI() {
        if (typeof GM !== 'undefined') return true;
        if (typeof GM_info !== 'undefined') {
            useCompatibilityMode = true;
            console.warn("YouTube Auto-Resume: Running in compatibility mode.");
            return true;
        }
        return false;
    }

    async function initialize() {
        isIFrame = window.top !== window.self;
        try {
            if (!hasGreasyMonkeyAPI() || isIFrame) return;
            await cleanUpStoredPlaybackStatuses();
            setInterval(cleanUpStoredPlaybackStatuses, 300000); // 5 minutes cleanup timer on a loop
            window.addEventListener('pageshow', handleInitialLoad, true);
            window.addEventListener('yt-player-updated', handleVideoLoad, true);
            window.addEventListener('yt-autonav-pause-player-ended', (event) => {
                const videoId = event.target?.player?.getVideoData()?.video_id;
                if (videoId) GMCustomDeleteValue(videoId);
            }, true);
        } catch (error) {
            console.error(`Error when initializing script: ${error}.`);
        }
    }

    initialize();
})();
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