// ==UserScript==
// @name         隐藏抖音登录弹窗
// @namespace    隐藏抖音登录弹窗
// @version      1.7.3
// @description  隐藏抖音上的登录弹窗和评论登录提示
// @author       LR
// @license      MIT
// @match        https://www.douyin.com/*
// @grant        none
// @downloadURL none
// ==/UserScript==

(function() {
    'use strict';

    const selectors = [
        '[id^="login-full-panel-"]',
        '#related-video-card-login-guide',
        'pace-island[id^="island_"]',
        '[id^="pace-island"]',
        'pace-island[id^=""]',
        '[id^="island_"]',
        '[class*="login-guide"]',
        '[class*="login-prompt"]'
    ];

    // 在DOM结构加载完成时尽早尝试隐藏弹窗
    document.addEventListener('DOMContentLoaded', function() {
        hideLoginPopup();
        startMutationObserver();
        addVideoToHistory();
    });

    // 使用 requestAnimationFrame 优化定期检查
    function startChecking() {
        function check() {
            hideLoginPopup();
            requestAnimationFrame(check);
        }
        requestAnimationFrame(check);
    }

    // 隐藏登录弹窗和相关提示的函数
    function hideLoginPopup() {
        selectors.forEach(selector => {
            document.querySelectorAll(selector).forEach(element => {
                if (isElementVisible(element)) {
                    element.style.display = 'none';
                }
            });
        });
    }

    // 检查元素是否可见
    function isElementVisible(element) {
        return !!(element.offsetWidth || element.offsetHeight || element.getClientRects().length);
    }

    // 使用 MutationObserver 观察 DOM 变化
    function startMutationObserver() {
        const observer = new MutationObserver(mutations => {
            mutations.forEach(mutation => {
                if (mutation.addedNodes && mutation.addedNodes.length > 0) {
                    hideLoginPopup();
                }
            });
        });

        observer.observe(document.body, { childList: true, subtree: true });
    }

    // 页面完全加载后再次隐藏弹窗，确保未被遗漏的弹窗被隐藏
    window.addEventListener('load', function() {
        hideLoginPopup();
    });

    // 提示欢迎消息
    window.addEventListener('load', function() {
        showGreetingsMessage();
    });

    // 弹出消息的函数
    function showGreetingsMessage() {
        const greetingsMessage = document.createElement('div');
        greetingsMessage.textContent = '你好同学! - LR';
        Object.assign(greetingsMessage.style, {
            position: 'fixed',
            top: '50%',
            left: '50%',
            transform: 'translate(-50%, -50%)',
            backgroundColor: 'rgba(255, 0, 0, 0.5)',
            padding: '10px',
            borderRadius: '5px',
            color: '#fff',
            zIndex: '9999',
        });
        document.body.appendChild(greetingsMessage);

        setTimeout(() => greetingsMessage.remove(), 3500);
    }

    // 添加当前视频到浏览历史
    function addVideoToHistory() {
        const videoId = getCurrentVideoId();
        if (videoId) {
            const history = getCookie('video_history') ? JSON.parse(getCookie('video_history')) : [];
            if (!history.includes(videoId)) {
                history.push(videoId);
                setCookie('video_history', JSON.stringify(history), 30);
            }
        }
    }

    // 获取当前视频ID的函数（需根据实际情况实现）
    function getCurrentVideoId() {
        // 根据实际的DOM结构获取视频ID
        const videoElement = document.querySelector('video'); // 示例，具体选择器需调整
        return videoElement ? videoElement.getAttribute('data-id') : null;
    }

    // 设置cookie
    function setCookie(name, value, days) {
        const expires = new Date();
        expires.setTime(expires.getTime() + (days * 24 * 60 * 60 * 1000));
        document.cookie = `${name}=${value};expires=${expires.toUTCString()};path=/`;
    }

    // 获取cookie
    function getCookie(name) {
        const nameEQ = name + "=";
        const ca = document.cookie.split(';');
        for (let i = 0; i < ca.length; i++) {
            let c = ca[i];
            while (c.charAt(0) === ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }

    startChecking(); // 启动定期检查
})();