// ==UserScript==
// @name Video Playback Speed Manager
// @namespace http://tampermonkey.net/
// @version 1.0.1
// @description 获取并管理video播放速度
// @author       Turnip
// @match        https://www.bilibili.com/video/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=bilibili.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // 创建或打开IndexedDB数据库
    const dbName = 'VideoPlaybackDB';
    const storeName = 'playbackSpeedStore';

    let db;
    const request = indexedDB.open(dbName, 1);

    request.onerror = function(event) {
        console.error('IndexedDB error:', event.target.errorCode);
    };

    request.onsuccess = function(event) {
        db = event.target.result;
        console.log('IndexedDB opened successfully');
    };

    request.onupgradeneeded = function(event) {
        db = event.target.result;
        db.createObjectStore(storeName, { keyPath: 'id', autoIncrement: true });
    };

    // 获取video元素
    const videoElement = document.querySelector('video');
    if (!videoElement) {
        console.error('Video element not found');
        return;
    }

    // 读取播放速度信息
    async function getPlaybackSpeed() {
        return new Promise((resolve, reject) => {
            const transaction = db.transaction(storeName, 'readonly');
            const store = transaction.objectStore(storeName);
            console.log("store",store)
            // 使用ID为11的记录来存储播放速度
            const request = store.get(1);
            console.log("request",request)

            request.onerror = function(event) {
                reject(event.target.errorCode);
            };

            request.onsuccess = function(event) {
                console.log("request target.result",event.target.result)
                resolve(event.target.result ? event.target.result.speed : null);
            };
        });
    }

    // 设置播放速度信息
    function setPlaybackSpeed(speed) {
        const transaction = db.transaction(storeName, 'readwrite');
        const store = transaction.objectStore(storeName);
        //使用ID为11的记录来存储播放速度
        const request = store.put({ id: 1, speed: speed });
        console.log("request",request)


        request.onerror = function(event) {
            console.error('Error setting playback speed:', event.target.errorCode);
        };
    }

    // 监控播放速度变化
    let currentSpeed = null;
    videoElement.addEventListener('loadedmetadata',async function() {
        currentSpeed =  await getPlaybackSpeed();
        console.log('Current playback speed:', currentSpeed);
        setPlaybackSpeed(currentSpeed);
    });

    videoElement.addEventListener('ratechange', function() {
        currentSpeed = videoElement.playbackRate;
        console.log('Playback speed changed to:', currentSpeed);
        setPlaybackSpeed(currentSpeed);
    });

    // 页面加载时恢复播放速度
    window.addEventListener('load', async function() {
        try {
            const speed = await getPlaybackSpeed();
            console.log('Restoring playback speed:', speed);
            if (speed !== null) {
                videoElement.playbackRate = speed;
                console.log('Restored playback speed:', speed);
            } else {
                // 如果没有找到播放速度信息，可以设置为默认值
                videoElement.playbackRate = 1;
                console.log('Playback speed set to default:', 1);
            }
        } catch (error) {
            console.error('Error restoring playback speed:', error);
        }
    });
})();