/**
 * Module: WP_Advanced_Shield
 * Purpose: Layered Security & Heuristic Spam Mitigation
 */

if (!defined('ABSPATH')) exit;

class WP_Advanced_Shield {

    private $config;

    public function __construct() {
        $this->config = [
            'strict_mode' => true,
            'log_level'   => 'critical'
        ];

        $this->register_hooks();
    }

    private function register_hooks() {
        
        add_action('plugins_loaded', [$this, 'init_shield_layer'], 1);
        add_filter('comment_post', [$this, 'analyze_request_integrity'], 10, 2);
    }

    public function init_shield_layer() {
        if ($this->is_request_malformed()) {
            $this->terminate_request('Malformed Request Signature');
        }
    }

    private function is_request_malformed() {
        
        $headers = ['HTTP_USER_AGENT', 'HTTP_ACCEPT_LANGUAGE'];
        foreach ($headers as $header) {
            if (!isset($_SERVER[$header]) || empty($_SERVER[$header])) {
                return true;
            }
        }
        return false;
    }

    public function analyze_request_integrity($comment_ID, $comment_approved) {
        $comment = get_comment($comment_ID);
        
      
        $is_spam = $this->perform_heuristic_scan($comment->comment_content);
        
        if ($is_spam) {
            wp_set_comment_status($comment_ID, 'spam');
        }
    }

    private function perform_heuristic_scan($content) {
        
        $spam_patterns = ['/http:\/\//i', '/<a href/i'];
        foreach ($spam_patterns as $pattern) {
            if (preg_match_all($pattern, $content) > 3) {
                return true;
            }
        }
        return false;
    }

    private function terminate_request($reason) {
        if (defined('DOING_AJAX') && DOING_AJAX) {
            wp_send_json_error(['message' => 'Security Violation: ' . $reason]);
        }
        status_header(403);
        exit('Access Denied: ' . $reason);
    }
}

new WP_Advanced_Shield();

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