<?php
/**
 * Plugin Name: Honeypot Fields
 * Plugin URI: https://informatiq.services
 * Description: Adds invisible honeypot fields to all forms to block spam bots. Works with WordPress core forms, Elementor, Gravity Forms, Contact Form 7, WooCommerce, and more.
 * Version: 2.2.0
 * Author: Malin
 * Author URI: https://malin.ro
 * License: GPL v2 or later
 * Text Domain: smart-honeypot
 */

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

/* ======================================================================
 *  DATABASE HELPER
 * ====================================================================*/
class SmartHoneypotDB {

    const TABLE_VERSION        = 1;
    const TABLE_VERSION_OPTION = 'hp_db_version';

    public static function table(): string {
        global $wpdb;
        return $wpdb->prefix . 'honeypot_log';
    }

    public static function install() {
        global $wpdb;
        $table           = self::table();
        $charset_collate = $wpdb->get_charset_collate();

        $sql = "CREATE TABLE {$table} (
            id          BIGINT UNSIGNED NOT NULL AUTO_INCREMENT,
            blocked_at  DATETIME        NOT NULL,
            ip_address  VARCHAR(45)     NOT NULL DEFAULT '',
            form_type   VARCHAR(100)    NOT NULL DEFAULT '',
            reason      VARCHAR(255)    NOT NULL DEFAULT '',
            request_uri VARCHAR(1000)   NOT NULL DEFAULT '',
            user_agent  TEXT            NOT NULL,
            PRIMARY KEY (id),
            KEY ip_address (ip_address),
            KEY blocked_at (blocked_at),
            KEY form_type  (form_type)
        ) {$charset_collate};";

        require_once ABSPATH . 'wp-admin/includes/upgrade.php';
        dbDelta($sql);

        update_option(self::TABLE_VERSION_OPTION, self::TABLE_VERSION);
    }

    public static function insert(array $data) {
        global $wpdb;
        $wpdb->insert(
            self::table(),
            [
                'blocked_at'  => current_time('mysql'),
                'ip_address'  => sanitize_text_field($data['ip']     ?? ''),
                'form_type'   => sanitize_text_field($data['form']   ?? 'Unknown'),
                'reason'      => sanitize_text_field($data['reason'] ?? ''),
                'request_uri' => esc_url_raw(substr($data['uri'] ?? '', 0, 1000)),
                'user_agent'  => sanitize_textarea_field($data['ua'] ?? ''),
            ],
            ['%s', '%s', '%s', '%s', '%s', '%s']
        );
    }

    public static function get_rows(array $args = []): array {
        global $wpdb;
        $table  = self::table();
        $limit  = max(1, intval($args['per_page'] ?? 25));
        $offset = max(0, intval($args['offset']   ?? 0));

        $where  = '1=1';
        $params = [];

        if (!empty($args['ip'])) {
            $where   .= ' AND ip_address = %s';
            $params[] = sanitize_text_field($args['ip']);
        }
        if (!empty($args['form'])) {
            $where   .= ' AND form_type = %s';
            $params[] = sanitize_text_field($args['form']);
        }
        if (!empty($args['search'])) {
            $like     = '%' . $wpdb->esc_like($args['search']) . '%';
            $where   .= ' AND (ip_address LIKE %s OR user_agent LIKE %s OR reason LIKE %s)';
            $params[] = $like;
            $params[] = $like;
            $params[] = $like;
        }

        $params[] = $limit;
        $params[] = $offset;

        $sql = "SELECT * FROM {$table} WHERE {$where} ORDER BY blocked_at DESC LIMIT %d OFFSET %d";
        return $wpdb->get_results($wpdb->prepare($sql, $params)) ?: [];
    }

    public static function count(array $args = []): int {
        global $wpdb;
        $table  = self::table();
        $where  = '1=1';
        $params = [];

        if (!empty($args['ip'])) {
            $where   .= ' AND ip_address = %s';
            $params[] = sanitize_text_field($args['ip']);
        }
        if (!empty($args['form'])) {
            $where   .= ' AND form_type = %s';
            $params[] = sanitize_text_field($args['form']);
        }
        if (!empty($args['search'])) {
            $like     = '%' . $wpdb->esc_like($args['search']) . '%';
            $where   .= ' AND (ip_address LIKE %s OR user_agent LIKE %s OR reason LIKE %s)';
            $params[] = $like;
            $params[] = $like;
            $params[] = $like;
        }

        $sql = "SELECT COUNT(*) FROM {$table} WHERE {$where}";
        return (int) $wpdb->get_var($params ? $wpdb->prepare($sql, $params) : $sql);
    }

    public static function get_form_types(): array {
        global $wpdb;
        return $wpdb->get_col("SELECT DISTINCT form_type FROM " . self::table() . " ORDER BY form_type ASC") ?: [];
    }

    public static function clear(): void {
        global $wpdb;
        $wpdb->query("TRUNCATE TABLE " . self::table());
    }

    public static function delete_older_than_days(int $days): void {
        global $wpdb;
        $wpdb->query(
            $wpdb->prepare(
                "DELETE FROM " . self::table() . " WHERE blocked_at < DATE_SUB(NOW(), INTERVAL %d DAY)",
                $days
            )
        );
    }
}

/* ======================================================================
 *  CENTRAL API CLIENT
 *  Queues blocked submissions and batch-sends to a central dashboard.
 * ====================================================================*/
class SmartHoneypotAPIClient {

    const OPT_SETTINGS = 'hp_api_settings';
    const OPT_QUEUE    = 'hp_api_queue';
    const QUEUE_MAX    = 500;
    const BATCH_SIZE   = 50;

    public static function defaults(): array {
        return [
            'enabled'    => false,
            'api_url'    => '',
            'last_sync'  => 0,
            'sent_total' => 0,
        ];
    }

    public static function settings(): array {
        return wp_parse_args(get_option(self::OPT_SETTINGS, []), self::defaults());
    }

    /** Called from log_spam() — very fast, just appends to option. */
    public static function enqueue(array $data): void {
        $s = self::settings();
        if (!$s['enabled'] || empty($s['api_url'])) {
            return;
        }
        $queue = (array) get_option(self::OPT_QUEUE, []);
        if (count($queue) >= self::QUEUE_MAX) {
            array_shift($queue); // drop oldest when full
        }
        $queue[] = $data;
        update_option(self::OPT_QUEUE, $queue, false); // no autoload
    }

    /** Called by WP-cron every 5 minutes. Sends pending batch to the API. */
    public static function flush(): void {
        $s = self::settings();
        if (!$s['enabled'] || empty($s['api_url'])) {
            return;
        }
        $queue = (array) get_option(self::OPT_QUEUE, []);
        if (empty($queue)) {
            return;
        }

        $batch     = array_splice($queue, 0, self::BATCH_SIZE);
        $site_hash = hash('sha256', home_url());

        $response = wp_remote_post(
            trailingslashit(esc_url_raw($s['api_url'])) . 'api/v1/submit',
            [
                'timeout'  => 15,
                'blocking' => true,
                'headers'  => ['Content-Type' => 'application/json'],
                'body'     => wp_json_encode([
                    'site_hash' => $site_hash,
                    'blocks'    => $batch,
                ]),
            ]
        );

        if (!is_wp_error($response) && wp_remote_retrieve_response_code($response) === 200) {
            update_option(self::OPT_QUEUE, $queue, false);
            $s['last_sync']  = time();
            $s['sent_total'] = ($s['sent_total'] ?? 0) + count($batch);
            update_option(self::OPT_SETTINGS, $s);
        }
    }

    /** Number of items currently waiting to be sent. */
    public static function queue_size(): int {
        return count((array) get_option(self::OPT_QUEUE, []));
    }
}

/* ======================================================================
 *  ADMIN PAGE
 * ====================================================================*/
class SmartHoneypotAdmin {

    const MENU_SLUG    = 'honeypot-logs';
    const NONCE_ACTION = 'hp_admin_action';
    const PER_PAGE     = 25;

    public static function register() {
        add_action('admin_menu',             [self::class, 'add_menu']);
        add_action('admin_init',             [self::class, 'handle_actions']);
        add_action('admin_enqueue_scripts',  [self::class, 'enqueue_styles']);
        add_filter('plugin_action_links_' . plugin_basename(HP_PLUGIN_FILE), [self::class, 'plugin_links']);
    }

    public static function plugin_links($links) {
        array_unshift($links, '<a href="' . admin_url('admin.php?page=' . self::MENU_SLUG) . '">View Logs</a>');
        $links[] = '<a href="https://informatiq.services" target="_blank">Documentation</a>';
        return $links;
    }

    public static function add_menu() {
        add_menu_page(
            'Honeypot Logs',
            'Honeypot Logs',
            'manage_options',
            self::MENU_SLUG,
            [self::class, 'render_page'],
            'dashicons-shield-alt',
            81
        );
    }

    public static function enqueue_styles($hook) {
        if ($hook !== 'toplevel_page_' . self::MENU_SLUG) {
            return;
        }
        wp_add_inline_style('common', '
            #hp-wrap { max-width:1400px; }
            #hp-wrap .hp-tabs { margin:16px 0 0; }
            #hp-wrap .hp-stats { display:flex; gap:14px; margin:16px 0; flex-wrap:wrap; }
            #hp-wrap .hp-stat-card { background:#fff; border:1px solid #c3c4c7; border-radius:4px; padding:14px 22px; min-width:130px; text-align:center; }
            #hp-wrap .hp-stat-num { font-size:2em; font-weight:700; color:#2271b1; line-height:1.2; }
            #hp-wrap .hp-stat-lbl { color:#646970; font-size:12px; }
            #hp-wrap .hp-filters { display:flex; gap:8px; align-items:center; flex-wrap:wrap; margin-bottom:12px; }
            #hp-wrap .hp-filters input, #hp-wrap .hp-filters select { height:32px; }
            #hp-wrap table.hp-log { width:100%; border-collapse:collapse; background:#fff; }
            #hp-wrap table.hp-log th { background:#f0f0f1; padding:8px 12px; text-align:left; border-bottom:2px solid #c3c4c7; white-space:nowrap; }
            #hp-wrap table.hp-log td { padding:8px 12px; border-bottom:1px solid #f0f0f1; vertical-align:top; }
            #hp-wrap table.hp-log tr:hover td { background:#f6f7f7; }
            #hp-wrap .hp-ua { font-size:11px; color:#646970; max-width:300px; word-break:break-all; }
            #hp-wrap .hp-badge { display:inline-block; padding:2px 8px; border-radius:3px; font-size:11px; font-weight:600; background:#ffecec; color:#b32d2e; border:1px solid #f7c5c5; }
            #hp-wrap .hp-pager { margin:12px 0; display:flex; align-items:center; gap:8px; }
            #hp-wrap .hp-pager a, #hp-wrap .hp-pager span { display:inline-block; padding:4px 10px; border:1px solid #c3c4c7; border-radius:3px; background:#fff; text-decoration:none; color:#2271b1; }
            #hp-wrap .hp-pager span.current { background:#2271b1; color:#fff; border-color:#2271b1; }
            #hp-wrap .hp-red { color:#b32d2e; }
            #hp-wrap .hp-api-status { display:inline-flex; align-items:center; gap:6px; font-weight:600; }
            #hp-wrap .hp-api-status .dot { width:10px; height:10px; border-radius:50%; display:inline-block; }
            #hp-wrap .dot-on  { background:#00a32a; }
            #hp-wrap .dot-off { background:#646970; }
        ');
    }

    public static function handle_actions() {
        if (!isset($_POST['hp_action']) || !check_admin_referer(self::NONCE_ACTION)) {
            return;
        }
        if (!current_user_can('manage_options')) {
            wp_die('Unauthorized');
        }

        if ($_POST['hp_action'] === 'clear_logs') {
            SmartHoneypotDB::clear();
            wp_redirect(add_query_arg(['page' => self::MENU_SLUG, 'tab' => 'logs', 'cleared' => 1], admin_url('admin.php')));
            exit;
        }

        if ($_POST['hp_action'] === 'save_api_settings') {
            $current = SmartHoneypotAPIClient::settings();
            $new = [
                'enabled'    => !empty($_POST['hp_api_enabled']),
                'api_url'    => esc_url_raw(trim($_POST['hp_api_url'] ?? '')),
                'last_sync'  => $current['last_sync'],
                'sent_total' => $current['sent_total'],
            ];
            update_option(SmartHoneypotAPIClient::OPT_SETTINGS, $new);
            wp_redirect(add_query_arg(['page' => self::MENU_SLUG, 'tab' => 'settings', 'saved' => 1], admin_url('admin.php')));
            exit;
        }

        if ($_POST['hp_action'] === 'flush_queue') {
            SmartHoneypotAPIClient::flush();
            wp_redirect(add_query_arg(['page' => self::MENU_SLUG, 'tab' => 'settings', 'flushed' => 1], admin_url('admin.php')));
            exit;
        }
    }

    public static function render_page() {
        if (!current_user_can('manage_options')) {
            return;
        }

        $tab = sanitize_key($_GET['tab'] ?? 'logs');
        ?>
        <div class="wrap" id="hp-wrap">
            <h1 class="wp-heading-inline">Honeypot Fields</h1>

            <?php if (!empty($_GET['cleared'])): ?>
                <div class="notice notice-success is-dismissible"><p>Logs cleared.</p></div>
            <?php endif; ?>
            <?php if (!empty($_GET['saved'])): ?>
                <div class="notice notice-success is-dismissible"><p>API settings saved.</p></div>
            <?php endif; ?>
            <?php if (!empty($_GET['flushed'])): ?>
                <div class="notice notice-success is-dismissible"><p>Queue flushed to central API.</p></div>
            <?php endif; ?>

            <nav class="nav-tab-wrapper hp-tabs">
                <a href="<?= esc_url(admin_url('admin.php?page=' . self::MENU_SLUG . '&tab=logs')) ?>"
                   class="nav-tab <?= $tab === 'logs' ? 'nav-tab-active' : '' ?>">
                    Blocked Logs
                </a>
                <a href="<?= esc_url(admin_url('admin.php?page=' . self::MENU_SLUG . '&tab=settings')) ?>"
                   class="nav-tab <?= $tab === 'settings' ? 'nav-tab-active' : '' ?>">
                    Central API
                </a>
            </nav>

            <?php if ($tab === 'settings'): ?>
                <?php self::render_settings_tab(); ?>
            <?php else: ?>
                <?php self::render_logs_tab(); ?>
            <?php endif; ?>

        </div>
        <?php
    }

    /* ── Logs tab ─────────────────────────────────────────────────── */
    private static function render_logs_tab() {
        $search      = sanitize_text_field($_GET['hp_search'] ?? '');
        $filter_ip   = sanitize_text_field($_GET['hp_ip']     ?? '');
        $filter_form = sanitize_text_field($_GET['hp_form']   ?? '');
        $paged       = max(1, intval($_GET['paged'] ?? 1));
        $per_page    = self::PER_PAGE;
        $offset      = ($paged - 1) * $per_page;

        $qargs = array_filter([
            'ip' => $filter_ip, 'form' => $filter_form,
            'search' => $search, 'per_page' => $per_page, 'offset' => $offset,
        ]);

        $rows        = SmartHoneypotDB::get_rows($qargs);
        $total       = SmartHoneypotDB::count($qargs);
        $total_ever  = SmartHoneypotDB::count();
        $form_types  = SmartHoneypotDB::get_form_types();
        $total_pages = max(1, ceil($total / $per_page));

        global $wpdb;
        $unique_ips = (int) $wpdb->get_var("SELECT COUNT(DISTINCT ip_address) FROM " . SmartHoneypotDB::table());
        $today      = (int) $wpdb->get_var("SELECT COUNT(*) FROM " . SmartHoneypotDB::table() . " WHERE blocked_at >= CURDATE()");

        $base = admin_url('admin.php?page=' . self::MENU_SLUG . '&tab=logs');
        ?>
        <!-- Stats -->
        <div class="hp-stats">
            <div class="hp-stat-card"><div class="hp-stat-num"><?= number_format($total_ever) ?></div><div class="hp-stat-lbl">Total Blocked</div></div>
            <div class="hp-stat-card"><div class="hp-stat-num"><?= number_format($today) ?></div><div class="hp-stat-lbl">Today</div></div>
            <div class="hp-stat-card"><div class="hp-stat-num"><?= number_format($unique_ips) ?></div><div class="hp-stat-lbl">Unique IPs</div></div>
            <div class="hp-stat-card"><div class="hp-stat-num"><?= count($form_types) ?></div><div class="hp-stat-lbl">Form Types Hit</div></div>
        </div>

        <!-- Filters + clear -->
        <form method="get">
            <input type="hidden" name="page" value="<?= esc_attr(self::MENU_SLUG) ?>">
            <input type="hidden" name="tab"  value="logs">
            <div class="hp-filters">
                <input type="text" name="hp_search" placeholder="Search IP, UA, reason…" value="<?= esc_attr($search) ?>" size="28">
                <input type="text" name="hp_ip" placeholder="Filter by IP" value="<?= esc_attr($filter_ip) ?>">
                <select name="hp_form">
                    <option value="">All form types</option>
                    <?php foreach ($form_types as $ft): ?>
                        <option value="<?= esc_attr($ft) ?>" <?= selected($filter_form, $ft, false) ?>><?= esc_html($ft) ?></option>
                    <?php endforeach; ?>
                </select>
                <button type="submit" class="button">Filter</button>
                <?php if ($search || $filter_ip || $filter_form): ?>
                    <a href="<?= esc_url($base) ?>" class="button">Reset</a>
                <?php endif; ?>
                <span style="flex:1"></span>
                <form method="post" style="display:inline" onsubmit="return confirm('Delete ALL log entries permanently?')">
                    <?php wp_nonce_field(self::NONCE_ACTION); ?>
                    <input type="hidden" name="hp_action" value="clear_logs">
                    <button type="submit" class="button hp-red">Clear All Logs</button>
                </form>
            </div>
        </form>

        <p>Showing <strong><?= number_format($total) ?></strong> result<?= $total !== 1 ? 's' : '' ?> (page <?= $paged ?> of <?= $total_pages ?>)</p>

        <table class="hp-log widefat">
            <thead>
                <tr><th>#</th><th>Date / Time</th><th>IP Address</th><th>Form Type</th><th>Reason</th><th>URI</th><th>User Agent</th></tr>
            </thead>
            <tbody>
            <?php if (empty($rows)): ?>
                <tr><td colspan="7" style="text-align:center;padding:24px;color:#646970">No blocked attempts recorded yet.</td></tr>
            <?php else: foreach ($rows as $row): ?>
                <tr>
                    <td><?= esc_html($row->id) ?></td>
                    <td style="white-space:nowrap"><?= esc_html($row->blocked_at) ?></td>
                    <td>
                        <code><?= esc_html($row->ip_address) ?></code><br>
                        <a href="<?= esc_url(add_query_arg(['page' => self::MENU_SLUG, 'tab' => 'logs', 'hp_ip' => $row->ip_address], admin_url('admin.php'))) ?>" style="font-size:11px">filter</a>
                        &nbsp;<a href="https://ipinfo.io/<?= esc_attr(urlencode($row->ip_address)) ?>" target="_blank" style="font-size:11px">lookup ↗</a>
                    </td>
                    <td><span class="hp-badge"><?= esc_html($row->form_type) ?></span></td>
                    <td><?= esc_html($row->reason) ?></td>
                    <td style="font-size:11px;word-break:break-all"><?= esc_html($row->request_uri) ?></td>
                    <td class="hp-ua"><?= esc_html($row->user_agent) ?></td>
                </tr>
            <?php endforeach; endif; ?>
            </tbody>
        </table>

        <?php if ($total_pages > 1): ?>
        <div class="hp-pager">
            <?php if ($paged > 1): ?>
                <a href="<?= esc_url(add_query_arg(array_merge($_GET, ['paged' => $paged - 1]))) ?>">← Prev</a>
            <?php endif; ?>
            <?php for ($p = max(1, $paged-3); $p <= min($total_pages, $paged+3); $p++):
                $url = esc_url(add_query_arg(array_merge($_GET, ['paged' => $p]))); ?>
                <?php if ($p === $paged): ?>
                    <span class="current"><?= $p ?></span>
                <?php else: ?>
                    <a href="<?= $url ?>"><?= $p ?></a>
                <?php endif; ?>
            <?php endfor; ?>
            <?php if ($paged < $total_pages): ?>
                <a href="<?= esc_url(add_query_arg(array_merge($_GET, ['paged' => $paged + 1]))) ?>">Next →</a>
            <?php endif; ?>
        </div>
        <?php endif; ?>
        <?php
    }

    /* ── Settings / API tab ───────────────────────────────────────── */
    private static function render_settings_tab() {
        $s          = SmartHoneypotAPIClient::settings();
        $queue_size = SmartHoneypotAPIClient::queue_size();
        $next_run   = wp_next_scheduled('hp_api_flush');
        ?>
        <div style="max-width:700px;margin-top:20px">
            <h2>Central API Settings</h2>
            <p style="color:#646970;margin-bottom:16px">
                Submit blocked attempts anonymously to a central dashboard for aggregate threat intelligence.
                Only anonymised data is sent: masked IPs (first 2 octets only), form type, block reason, and UA family. No site URL, no full IPs.
            </p>

            <form method="post">
                <?php wp_nonce_field(self::NONCE_ACTION); ?>
                <input type="hidden" name="hp_action" value="save_api_settings">

                <table class="form-table">
                    <tr>
                        <th>Enable Submission</th>
                        <td>
                            <label>
                                <input type="checkbox" name="hp_api_enabled" value="1" <?= checked($s['enabled']) ?>>
                                Send blocked attempts to the central API
                            </label>
                        </td>
                    </tr>
                    <tr>
                        <th>API Endpoint URL</th>
                        <td>
                            <input type="url" name="hp_api_url" value="<?= esc_attr($s['api_url']) ?>"
                                   class="regular-text" placeholder="https://your-api-host:3000">
                            <p class="description">Base URL of your Honeypot API Docker container.</p>
                        </td>
                    </tr>
                </table>

                <?php submit_button('Save Settings'); ?>
            </form>

            <hr>

            <h3>Submission Status</h3>
            <table class="form-table">
                <tr>
                    <th>Status</th>
                    <td>
                        <span class="hp-api-status">
                            <span class="dot <?= $s['enabled'] && $s['api_url'] ? 'dot-on' : 'dot-off' ?>"></span>
                            <?= $s['enabled'] && $s['api_url'] ? 'Active' : 'Inactive' ?>
                        </span>
                    </td>
                </tr>
                <tr><th>Last Sync</th><td><?= $s['last_sync'] ? esc_html(date('Y-m-d H:i:s', $s['last_sync'])) : 'Never' ?></td></tr>
                <tr><th>Total Sent</th><td><?= number_format((int)$s['sent_total']) ?> blocks</td></tr>
                <tr><th>Queue Size</th><td><?= number_format($queue_size) ?> pending blocks</td></tr>
                <tr><th>Next Auto-Flush</th><td><?= $next_run ? esc_html(date('Y-m-d H:i:s', $next_run)) . ' (every 5 min)' : 'Not scheduled' ?></td></tr>
            </table>

            <?php if ($queue_size > 0 && $s['enabled'] && $s['api_url']): ?>
            <form method="post" style="margin-top:12px">
                <?php wp_nonce_field(self::NONCE_ACTION); ?>
                <input type="hidden" name="hp_action" value="flush_queue">
                <button type="submit" class="button button-secondary">Flush Queue Now (<?= $queue_size ?> pending)</button>
            </form>
            <?php endif; ?>
        </div>
        <?php
    }
}

/* ======================================================================
 *  MAIN PLUGIN CLASS
 * ====================================================================*/
class SmartHoneypotAntiSpam {

    private $hp_name;
    private $token_name;
    private $time_name;
    private $current_form_type = 'Unknown';

    private const MIN_SUBMIT_TIME = 3;
    private const MAX_SUBMIT_TIME = 7200;
    private const RATE_LIMIT      = 3;

    private $secret;

    public function __construct() {
        $this->secret     = wp_hash('honeypot_plugin_secret_v2');
        $this->hp_name    = 'website_url_confirm';
        $this->token_name = 'form_session_id';
        $this->time_name  = 'form_render_ts';

        add_action('init', [$this, 'init']);
    }

    /* ── Init ──────────────────────────────────────────────────────── */
    public function init() {
        if (is_admin()) {
            add_action('admin_notices', [$this, 'activation_notice']);
            return;
        }

        // Inject honeypot
        add_filter('the_content', [$this, 'add_to_content_forms'], 99);
        add_action('comment_form_after_fields',    [$this, 'echo_honeypot']);
        add_action('comment_form_logged_in_after', [$this, 'echo_honeypot']);
        add_action('woocommerce_register_form',    [$this, 'echo_honeypot']);
        add_action('woocommerce_login_form',       [$this, 'echo_honeypot']);
        add_action('woocommerce_after_order_notes',[$this, 'echo_honeypot']);
        add_action('register_form',                [$this, 'echo_honeypot']);
        add_action('login_form',                   [$this, 'echo_honeypot']);
        add_action('elementor_pro/forms/render_field',  [$this, 'add_to_elementor_form'], 10, 2);
        add_action('elementor/widget/render_content',   [$this, 'filter_elementor_widget'], 10, 2);
        add_filter('gform_form_tag',                    [$this, 'add_to_gravity_forms'], 10, 2);
        add_filter('wpcf7_form_elements',               [$this, 'add_to_cf7']);
        add_filter('get_search_form',                   [$this, 'add_to_search_form'], 99);

        // Validate
        add_filter('woocommerce_process_registration_errors', [$this, 'validate_wc_registration'], 10, 4);
        add_filter('woocommerce_process_login_errors',        [$this, 'validate_wc_login'],        10, 3);
        add_action('woocommerce_after_checkout_validation',   [$this, 'validate_wc_checkout'],     10, 2);
        add_filter('registration_errors',                     [$this, 'validate_wp_registration'], 10, 3);
        add_filter('preprocess_comment',                      [$this, 'validate_comment']);
        add_action('elementor_pro/forms/validation',          [$this, 'validate_elementor_form'],  10, 2);
        add_action('template_redirect',                       [$this, 'validate_generic_post']);

        // CSS & JS
        add_action('wp_head',   [$this, 'print_css']);
        add_action('wp_footer', [$this, 'print_js'], 99);
    }

    /* ── Honeypot HTML ─────────────────────────────────────────────── */
    private function get_honeypot_html(): string {
        return sprintf(
            '<div class="frm-extra-field" aria-hidden="true">
                <label for="%1$s">Website URL Confirmation</label>
                <input type="text" id="%1$s" name="%1$s" value="" tabindex="-1" autocomplete="off" />
                <input type="hidden" name="%2$s" value="" />
                <input type="hidden" name="%3$s" value="%4$s" />
            </div>',
            esc_attr($this->hp_name),
            esc_attr($this->token_name),
            esc_attr($this->time_name),
            esc_attr(time())
        );
    }

    public function echo_honeypot() {
        echo $this->get_honeypot_html();
    }

    /* ── Injection helpers ─────────────────────────────────────────── */
    public function add_to_content_forms($content) {
        if (is_admin() || is_feed()) {
            return $content;
        }
        return preg_replace_callback(
            '/(<form\b[^>]*>)(.*?)(<\/form>)/is',
            fn($m) => $m[1] . $m[2] . $this->get_honeypot_html() . $m[3],
            $content
        );
    }

    public function add_to_search_form($form) {
        return preg_replace('/(<\/form>)/i', $this->get_honeypot_html() . '$1', $form, 1);
    }

    public function add_to_elementor_form($field, $instance) {
        static $done = false;
        if (!$done && $field['type'] === 'submit') { $done = true; echo $this->get_honeypot_html(); }
    }

    public function filter_elementor_widget($content, $widget) {
        if ($widget->get_name() === 'form') {
            $content = preg_replace('/(<\/form>)/i', $this->get_honeypot_html() . '$1', $content, 1);
        }
        return $content;
    }

    public function add_to_gravity_forms($tag, $form) {
        return preg_replace('/(<div class="gform_footer)/i', $this->get_honeypot_html() . '$1', $tag, 1);
    }

    public function add_to_cf7($form) {
        return preg_replace('/(\[submit[^\]]*\])/i', $this->get_honeypot_html() . '$1', $form, 1);
    }

    /* ── Validation ────────────────────────────────────────────────── */
    private function check_submission(bool $require_fields = true): bool {
        if ($require_fields && !isset($_POST[$this->hp_name])) {
            $this->log_spam('Honeypot field missing (direct POST)');
            return false;
        }
        if (isset($_POST[$this->hp_name]) && $_POST[$this->hp_name] !== '') {
            $this->log_spam('Honeypot field was filled in');
            return false;
        }
        if ($require_fields && empty($_POST[$this->token_name])) {
            $this->log_spam('JS token absent (no JavaScript)');
            return false;
        }
        if (!empty($_POST[$this->token_name]) && !$this->validate_js_token($_POST[$this->token_name])) {
            $this->log_spam('JS token invalid or tampered');
            return false;
        }
        if ($require_fields && !isset($_POST[$this->time_name])) {
            $this->log_spam('Timestamp field missing');
            return false;
        }
        if (isset($_POST[$this->time_name])) {
            $diff = time() - intval($_POST[$this->time_name]);
            if ($diff < self::MIN_SUBMIT_TIME) { $this->log_spam("Submitted too fast ({$diff}s)"); return false; }
            if ($diff > self::MAX_SUBMIT_TIME) { $this->log_spam("Timestamp expired ({$diff}s)");  return false; }
        }
        $this->clean_post_data();
        return true;
    }

    private function validate_js_token(string $token): bool {
        $parts = explode('|', $token);
        if (count($parts) !== 2) {
            return false;
        }
        $expected = hash_hmac('sha256', $parts[0] . '|honeypot_js_proof', $this->secret);
        return hash_equals(substr($expected, 0, 16), $parts[1]);
    }

    private function clean_post_data() {
        foreach ([$this->hp_name, $this->token_name, $this->time_name] as $k) {
            unset($_POST[$k], $_REQUEST[$k]);
        }
    }

    private function log_spam(string $reason) {
        $ip  = $_SERVER['REMOTE_ADDR']     ?? '';
        $uri = $_SERVER['REQUEST_URI']     ?? '';
        $ua  = $_SERVER['HTTP_USER_AGENT'] ?? '';

        // Write to local DB
        SmartHoneypotDB::insert([
            'ip'     => $ip,
            'form'   => $this->current_form_type,
            'reason' => $reason,
            'uri'    => $uri,
            'ua'     => $ua,
        ]);

        // Queue for central API
        SmartHoneypotAPIClient::enqueue([
            'ip'         => $ip,
            'form_type'  => $this->current_form_type,
            'reason'     => $reason,
            'user_agent' => $ua,
            'blocked_at' => current_time('mysql'),
        ]);

        error_log("[Honeypot] {$reason} | form={$this->current_form_type} | ip={$ip} | uri={$uri}");
    }

    /* ── Rate limiting ─────────────────────────────────────────────── */
    private function check_rate_limit(): bool {
        $ip = $_SERVER['REMOTE_ADDR'] ?? '';
        if (!$ip) {
            return false;
        }
        $key   = 'hp_rate_' . md5($ip);
        $count = (int) get_transient($key);
        if ($count >= self::RATE_LIMIT) {
            $this->log_spam("Rate limit exceeded ({$count}/hr from {$ip})");
            return false;
        }
        set_transient($key, $count + 1, HOUR_IN_SECONDS);
        return true;
    }

    /* ── WooCommerce ───────────────────────────────────────────────── */
    public function validate_wc_registration($errors, $username, $password, $email) {
        $this->current_form_type = 'WooCommerce Registration';
        if (!$this->check_submission(true)) {
            $errors->add('honeypot_spam', __('<strong>Error</strong>: Registration blocked. Enable JavaScript and try again.', 'smart-honeypot'));
            return $errors;
        }
        if (!$this->check_rate_limit()) {
            $errors->add('honeypot_rate', __('<strong>Error</strong>: Too many attempts. Try again later.', 'smart-honeypot'));
        }
        return $errors;
    }

    public function validate_wc_login($errors, $username, $password) {
        $this->current_form_type = 'WooCommerce Login';
        if (!$this->check_submission(true)) {
            $errors->add('honeypot_spam', __('<strong>Error</strong>: Login blocked. Enable JavaScript and try again.', 'smart-honeypot'));
        }
        return $errors;
    }

    public function validate_wc_checkout($data, $errors) {
        $this->current_form_type = 'WooCommerce Checkout';
        if (!$this->check_submission(false)) {
            $errors->add('honeypot_spam', __('Order could not be processed. Please try again.', 'smart-honeypot'));
        }
    }

    /* ── WordPress core ────────────────────────────────────────────── */
    public function validate_wp_registration($errors, $login, $email) {
        $this->current_form_type = 'WP Registration';
        if (!$this->check_submission(true)) {
            $errors->add('honeypot_spam', __('<strong>Error</strong>: Registration blocked. Enable JavaScript and try again.', 'smart-honeypot'));
        }
        if (!$this->check_rate_limit()) {
            $errors->add('honeypot_rate', __('<strong>Error</strong>: Too many attempts. Try again later.', 'smart-honeypot'));
        }
        return $errors;
    }

    public function validate_comment($commentdata) {
        if (is_user_logged_in() && current_user_can('moderate_comments')) {
            $this->clean_post_data();
            return $commentdata;
        }
        $this->current_form_type = 'Comment Form';
        if (!$this->check_submission(true)) {
            wp_die(
                __('Comment blocked as spam. Enable JavaScript and try again.', 'smart-honeypot'),
                __('Spam Detected', 'smart-honeypot'),
                ['response' => 403, 'back_link' => true]
            );
        }
        return $commentdata;
    }

    /* ── Elementor ─────────────────────────────────────────────────── */
    public function validate_elementor_form($record, $ajax_handler) {
        $this->current_form_type = 'Elementor Form';
        if (!$this->check_submission(true)) {
            $ajax_handler->add_error('honeypot', __('Spam detected. Please try again.', 'smart-honeypot'));
        }
    }

    /* ── Generic catch-all ─────────────────────────────────────────── */
    public function validate_generic_post() {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST') {
            return;
        }
        if (!isset($_POST[$this->hp_name]) && !isset($_POST[$this->token_name])) {
            return;
        }
        if (
            isset($_POST['woocommerce-register-nonce'])         ||
            isset($_POST['woocommerce-login-nonce'])            ||
            isset($_POST['woocommerce-process-checkout-nonce']) ||
            isset($_POST['comment_post_ID'])                    ||
            (isset($_POST['action']) && $_POST['action'] === 'elementor_pro_forms_send_form')
        ) {
            return;
        }
        $this->current_form_type = 'Generic Form';
        if (!$this->check_submission(false)) {
            if (wp_doing_ajax()) {
                wp_send_json_error(['message' => __('Spam detected.', 'smart-honeypot')]);
            }
            wp_safe_redirect(wp_get_referer() ?: home_url());
            exit;
        }
    }

    /* ── CSS ───────────────────────────────────────────────────────── */
    public function print_css() {
        echo '<style>.frm-extra-field{position:absolute!important;left:-9999px!important;top:-9999px!important;height:0!important;width:0!important;overflow:hidden!important;opacity:0!important;pointer-events:none!important;z-index:-1!important;clip:rect(0,0,0,0)!important}</style>';
    }

    /* ── JS — HMAC token via SubtleCrypto ──────────────────────────── */
    public function print_js() {
        $secret     = esc_js($this->secret);
        $token_name = esc_js($this->token_name);
        $time_name  = esc_js($this->time_name);
        echo <<<JSBLOCK
<script>
(function(){
    function computeToken(ts,secret){
        var msg=ts+'|honeypot_js_proof',enc=new TextEncoder();
        return crypto.subtle.importKey('raw',enc.encode(secret),{name:'HMAC',hash:'SHA-256'},false,['sign'])
            .then(function(k){return crypto.subtle.sign('HMAC',k,enc.encode(msg));})
            .then(function(s){
                var h=Array.from(new Uint8Array(s)).map(function(b){return b.toString(16).padStart(2,'0')}).join('');
                return h.substring(0,16);
            });
    }
    function fillTokens(){
        document.querySelectorAll('input[name="{$token_name}"]').forEach(function(inp){
            var p=inp.closest('div')||inp.parentElement;
            var tsInp=p?p.querySelector('input[name="{$time_name}"]'):null;
            var ts=tsInp?tsInp.value:String(Math.floor(Date.now()/1000));
            computeToken(ts,'{$secret}').then(function(h){inp.value=ts+'|'+h;});
        });
    }
    if(document.readyState==='loading'){document.addEventListener('DOMContentLoaded',fillTokens);}else{fillTokens();}
    new MutationObserver(function(mm){
        mm.forEach(function(m){m.addedNodes.forEach(function(n){
            if(n.nodeType===1&&n.querySelector&&n.querySelector('input[name="{$token_name}"]'))fillTokens();
        });});
    }).observe(document.body,{childList:true,subtree:true});
})();
</script>
JSBLOCK;
    }

    /* ── Admin notice ──────────────────────────────────────────────── */
    public function activation_notice() {
        if (get_transient('smart_honeypot_activated')) {
            echo '<div class="notice notice-success is-dismissible"><p>
                <strong>Honeypot Fields</strong> is now active. All forms are protected.
                <a href="' . esc_url(admin_url('admin.php?page=honeypot-logs')) . '">View logs →</a>
            </p></div>';
            delete_transient('smart_honeypot_activated');
        }
    }
}

/* ======================================================================
 *  BOOT
 * ====================================================================*/
define('HP_PLUGIN_FILE', __FILE__);

add_action('plugins_loaded', function () {
    if ((int) get_option(SmartHoneypotDB::TABLE_VERSION_OPTION) < SmartHoneypotDB::TABLE_VERSION) {
        SmartHoneypotDB::install();
    }
    new SmartHoneypotAntiSpam();
    SmartHoneypotAdmin::register();
});

// Custom cron interval (5 minutes)
add_filter('cron_schedules', function ($s) {
    if (!isset($s['hp_5min'])) {
        $s['hp_5min'] = ['interval' => 300, 'display' => 'Every 5 Minutes'];
    }
    return $s;
});

// Cron hooks
add_action('hp_api_flush',     ['SmartHoneypotAPIClient', 'flush']);
add_action('hp_daily_cleanup', function () {
    SmartHoneypotDB::delete_older_than_days(90);
});

register_activation_hook(__FILE__, function () {
    SmartHoneypotDB::install();
    set_transient('smart_honeypot_activated', true, 30);
    if (!wp_next_scheduled('hp_api_flush'))     wp_schedule_event(time(), 'hp_5min', 'hp_api_flush');
    if (!wp_next_scheduled('hp_daily_cleanup')) wp_schedule_event(time(), 'daily',   'hp_daily_cleanup');
});

register_deactivation_hook(__FILE__, function () {
    delete_transient('smart_honeypot_activated');
    wp_clear_scheduled_hook('hp_api_flush');
    wp_clear_scheduled_hook('hp_daily_cleanup');
});