<?php
defined('ABSPATH') || exit;

trait AKSRT_Moderation_Part_2 {


    private function normalize_text(string $text): string {
        $text = preg_replace('/[\x{200B}-\x{200D}\x{FEFF}]/u', '', $text);
        $text = preg_replace('/\s+/u', '', (string) $text);
        if (function_exists('mb_strtolower')) {
            return mb_strtolower((string) $text, 'UTF-8');
        }
        return strtolower((string) $text);
    }

    // ============================================================
    // 4. Rate limit
    // ============================================================

    private function check_rate_limit(array $data, array $config, string $ip) {
        if (empty($config['rate_limit_enabled'])) {
            return true;
        }

        $min_interval = max(1, (int) ($config['rate_limit_min_interval'] ?? 8));
        $max_per_hour = max(1, (int) ($config['rate_limit_max_per_hour'] ?? 15));
        $prefix = 'aksrt_rate_';

        $last_key = $prefix . md5($ip . '_last');
        $hour_key = $prefix . md5($ip . '_hourly');
        $exp_key = '_' . $prefix . md5($ip . '_hourly_expiry');

        $last_comment_time = get_transient($last_key);
        if ($last_comment_time !== false) {
            $elapsed = time() - (int) $last_comment_time;
            if ($elapsed < $min_interval) {
                $wait_time = $min_interval - $elapsed;
                return sprintf(__('You are commenting too fast. Please wait %d seconds.', 'aksrt'), $wait_time);
            }
        }

        $hourly_count = get_transient($hour_key);
        if ($hourly_count !== false && (int) $hourly_count >= $max_per_hour) {
            $reset_time = (int) (get_transient($exp_key) ?: time());
            $remaining = max(0, $reset_time - time());
            $minutes = (int) ceil($remaining / 60);
            return sprintf(__('You have reached the hourly comment limit. Try again in %d minutes.', 'aksrt'), $minutes);
        }

        if ($hourly_count === false) {
            set_transient($hour_key, 1, HOUR_IN_SECONDS);
            set_transient($exp_key, time() + HOUR_IN_SECONDS, HOUR_IN_SECONDS);
        } else {
            set_transient($hour_key, ((int) $hourly_count) + 1, HOUR_IN_SECONDS);
        }
        set_transient($last_key, time(), $min_interval);

        return true;
    }

    // ============================================================
    // 5. GeoIP
    // ============================================================

    private function check_geoip(array $config, string $ip) {
        if (empty($config['geoip_enabled'])) {
            return true;
        }

        $block_countries = $config['geoip_block_countries'] ?? [];
        if (!is_array($block_countries) || empty($block_countries)) {
            return true;
        }

        $country_code = $this->lookup_geoip($ip, $config);
        if ($country_code === null) {
            return true;
        }

        $country_code = strtoupper($country_code);
        $block_upper = array_map('strtoupper', $block_countries);
        if (in_array($country_code, $block_upper, true)) {
            return sprintf(__('Comments from your region (%s) are currently blocked.', 'aksrt'), esc_html($country_code));
        }
        return true;
    }

    private function lookup_geoip(string $ip, array $config): ?string {
        // 优先复用 IP 归属地模块的查询能力（含缓存）
        if (class_exists('AKSRT_IP_Geo')) {
            $result = AKSRT_IP_Geo::get_instance()->lookup($ip);
            if (!empty($result['country'])) {
                return $result['country'];
            }
        }

        // 回退到内置查询
        $ip_geo_config = class_exists('AKSRT_Settings')
            ? AKSRT_Settings::get_ip_geo_settings()
            : [];
        $provider = (string) ($ip_geo_config['ip_geo_provider'] ?? $config['geoip_provider'] ?? 'ip-api.com');
        $api_key = (string) ($ip_geo_config['ip_geo_api_key'] ?? $config['geoip_api_key'] ?? '');

        if ($provider === 'ipinfo' || $provider === 'ipinfo.io') {
            return $this->geoip_ipinfo($ip, $api_key);
        }
        return $this->geoip_ipapi($ip);
    }

    /**
     * Free ip-api.com endpoint.
     */
    private function geoip_ipapi(string $ip): ?string {
        $url = 'http://ip-api.com/json/' . urlencode($ip) . '?fields=status,countryCode,message';
        $response = wp_remote_get($url, [
            'timeout' => 5,
            'headers' => ['Accept' => 'application/json'],
        ]);

        if (is_wp_error($response)) {
            return null;
        }

        $body = json_decode((string) wp_remote_retrieve_body($response), true);
        if (($body['status'] ?? '') === 'success') {
            return $body['countryCode'] ?? null;
        }
        return null;
    }

    private function geoip_ipinfo(string $ip, string $api_key): ?string {
        $url = 'https://ipinfo.io/' . urlencode($ip) . '/json?token=' . urlencode($api_key ?: '');
        $response = wp_remote_get($url, [
            'timeout' => 5,
            'headers' => ['Accept' => 'application/json'],
        ]);

        if (is_wp_error($response)) {
            return null;
        }

        $body = json_decode((string) wp_remote_retrieve_body($response), true);
        return $body['country'] ?? null;
    }

    // ============================================================
    // Utilities
    // ============================================================

    private function get_client_ip(): string {
        $keys = ['HTTP_X_FORWARDED_FOR', 'HTTP_X_REAL_IP', 'HTTP_CLIENT_IP'];
        foreach ($keys as $key) {
            if (!empty($_SERVER[$key])) {
                $parts = explode(',', (string) $_SERVER[$key]);
                $ip = trim($parts[0]);
                if (filter_var($ip, FILTER_VALIDATE_IP)) {
                    return $ip;
                }
            }
        }
        return $_SERVER['REMOTE_ADDR'] ?? '0.0.0.0';
    }
}