// 访问者跟踪代码
// tracking.js
document.addEventListener('DOMContentLoaded', function() {
    // 收集访问者信息
    const trackingData = {
        page_url: window.location.href,
        page_title: document.title,
        referrer: document.referrer,
        screen_width: window.screen.width,
        screen_height: window.screen.height,
        language: navigator.language,
        siteid: '4cbedbb2d0b5452a8e',
    };
    //alert(trackingData.siteid);
    // 检查是否有唯一的访问者ID
    let visitorId = localStorage.getItem('visitor_id');
    if (!visitorId) {
        visitorId = generateVisitorId();
        localStorage.setItem('visitor_id', visitorId);
    }
    trackingData.visitor_id = visitorId;

    // 发送数据到后端
    sendTrackingData(trackingData);
});

function generateVisitorId() {
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        const r = Math.random() * 16 | 0;
        const v = c === 'x' ? r : (r & 0x3 | 0x8);
        return v.toString(16);
    });
}

function sendTrackingData(data) {
    // 使用navigator.sendBeacon如果可用，否则使用fetch
    if (navigator.sendBeacon) {
        const blob = new Blob([JSON.stringify(data)], {type: 'application/json'});
        navigator.sendBeacon('https://dddec.site/api/posttracking.php', blob);
    } else {
        fetch('https://dddec.site/api/posttracking.php', {
            method: 'POST',
            body: JSON.stringify(data),
            headers: {
                'Content-Type': 'application/json'
            },
            keepalive: true
        });
    }
}