<?php
// Function to get visitor's IP address
function getVisitorIP() {
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        // Check for shared IP
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        // Check for proxy IP (use the first IP in the list)
        $ipList = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        $ip = trim($ipList[0]); // Use the first IP address
    } elseif (!empty($_SERVER['HTTP_X_REAL_IP'])) {
        // Check for real IP (e.g., from CDN)
        $ip = $_SERVER['HTTP_X_REAL_IP'];
    } else {
        // Default IP
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}

// Function to get location from IP address using ip-api
function getLocationFromIP($ip) {
    $url = "http://ip-api.com/json/{$ip}";

    $response = @file_get_contents($url);
    $data = json_decode($response, true);

    if (isset($data['country'])) {
        return $data['country'];
    } else {
        return 'Unknown';
    }
}

// Function to write logs to file in Chinese
function writeLog($logMessage) {
    $logFile = __DIR__ . '/request_logs.txt'; // Log file path

    // Prepare the log message with timestamp
    $logMessage = "[" . date('Y-m-d H:i:s') . "] " . $logMessage . "\n";

    // Write the log message to the file
    file_put_contents($logFile, $logMessage, FILE_APPEND);
}

// Get visitor's IP address
$ip = getVisitorIP();

// Get location country
$country = getLocationFromIP($ip);

// Log request headers and IP address
$headers = apache_request_headers(); // Get all request headers

// Format headers for logging in Chinese
$headersLog = "访问者IP地址: " . $ip . "\n";
$headersLog .= "访问者国家: " . $country . "\n";
$headersLog .= "请求头信息:\n";

foreach ($headers as $header => $value) {
    $headersLog .= "$header: $value\n";
}

// API 返回日志信息
$apiResponseLog = "调用接口结果: " . ($country == 'China' ? "中国访问" : ($country == 'United States' ? "美国访问" : "其他国家访问")) . "\n";

// Write headers, country info, and API result to the log file
writeLog($headersLog);
writeLog($apiResponseLog);

// 301 重定向到不同域名
if ($country == "China") {
    writeLog("重定向到: /cn/products\n");
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: /cn/products');
} elseif ($country == "United States") {
    writeLog("重定向到: /en/products\n");
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: /en/products');
} else {
    writeLog("重定向到: /en/products (默认英文)\n");
    header('HTTP/1.1 301 Moved Permanently');
    header('Location: /en/products'); // Default to English
}

exit(); // Stop the script after redirecting
?>