// ==UserScript==
// @name         B站/哔哩哔哩/bilibili-视频自动开启中文字幕
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  自动点击B站视频的中文字幕选项，有限次尝试
// @author       Ny
// @icon  https://play-lh.googleusercontent.com/C1tISqYgtW_ejAmnGzvepbaYt7NJLagPelCZ_lzNv06RJPQgBx1_q3VX67z9wc48EgY=s1024
// @match        *://www.bilibili.com/video/*
// @match        *://www.bilibili.com/list/watchlater*
// @license MIT
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // 配置参数
    const MAX_ATTEMPTS = 10; // 最大尝试次数
    const RETRY_DELAY = 2000; // 重试延迟(毫秒)
    let attemptCount = 0; // 当前尝试次数
    let isActive = false; // 是否已激活

    // 等待页面加载完成
    window.addEventListener('load', function() {
        setTimeout(tryClickChineseSubtitle, 2000);
    });

    // 监听SPA路由变化
    let lastUrl = location.href;
    new MutationObserver(() => {
        const currentUrl = location.href;
        if (currentUrl !== lastUrl) {
            lastUrl = currentUrl;
            // 重置状态
            attemptCount = 0;
            isActive = false;
            setTimeout(tryClickChineseSubtitle, 2000);
        }
    }).observe(document, {subtree: true, childList: true});

    function tryClickChineseSubtitle() {
        if (isActive || attemptCount >= MAX_ATTEMPTS) {
            return; // 已激活或达到最大尝试次数，不再尝试
        }

        attemptCount++;
        console.log(`尝试点击中文字幕 (第 ${attemptCount} 次)`);

        const subtitleElements = document.querySelectorAll('.bpx-player-ctrl-subtitle-language-item-text');
        let found = false;

        for (let element of subtitleElements) {
            if (element.textContent.trim() === '中文') {
                found = true;
                console.log('找到中文字幕按钮');

                const parentElement = element.closest('.bpx-player-ctrl-subtitle-language-item');
                if (parentElement && !parentElement.classList.contains('bpx-state-active')) {
                    console.log('中文字幕未激活，执行点击');
                    element.click();

                    // 验证点击是否成功
                    setTimeout(() => {
                        if (parentElement.classList.contains('bpx-state-active')) {
                            console.log('中文字幕激活成功');
                            isActive = true;
                        } else {
                            console.log('中文字幕激活失败');
                            // 安排下一次尝试
                            if (attemptCount < MAX_ATTEMPTS) {
                                setTimeout(tryClickChineseSubtitle, RETRY_DELAY);
                            } else {
                                console.log(`已达到最大尝试次数(${MAX_ATTEMPTS})，放弃尝试`);
                            }
                        }
                    }, 500);
                } else {
                    console.log('中文字幕已激活');
                    isActive = true;
                }
                break;
            }
        }

        if (!found) {
            console.log('未找到中文字幕按钮');
            // 安排下一次尝试
            if (attemptCount < MAX_ATTEMPTS) {
                console.log(`${RETRY_DELAY/1000}秒后再次尝试`);
                setTimeout(tryClickChineseSubtitle, RETRY_DELAY);
            } else {
                console.log(`已达到最大尝试次数(${MAX_ATTEMPTS})，放弃尝试。可能此视频无中文字幕`);
            }
        }
    }

    // 初始执行
    setTimeout(tryClickChineseSubtitle, 2000);
})();