<?php

/**
 * Description of SystemInfo
 *
 * @author Ali2Woo Team
 * 
 * @autoload: a2wl_admin_init
 * 
 * @ajax: true
 */

namespace AliNext_Lite;;

class SystemInfo
{
    public function __construct() {
        add_action('wp_ajax_a2wl_ping', array($this, 'ajax_ping'));
        add_action('wp_ajax_nopriv_a2wl_ping', array($this, 'ajax_ping'));
        add_action('wp_ajax_a2wl_clear_log_file', array($this, 'ajax_clear_log_file'));
        add_action('wp_ajax_a2wl_clean_import_queue', [$this, 'ajax_clean_import_queue']);
        add_action('wp_ajax_a2wl_run_cron_import_queue', [$this, 'ajax_run_cron']);
    }

    public function ajax_clear_log_file() {
        Logs::getInstance()->delete();
        echo wp_json_encode(array('state'=>'ok'));
        wp_die();
    }

    public function ajax_clean_import_queue(): void
    {
        $import_process = new ImportProcess();
        $import_process->clean_queue();

        echo wp_json_encode(['state'=>'ok']);
        wp_die();
    }

    public function ajax_run_cron(): void
    {
        $import_process = new ImportProcess();
        $import_process->dispatch();

        echo wp_json_encode(['state'=>'ok']);
        wp_die();
    }

    public function ajax_ping() {
        echo wp_json_encode(array('state'=>'ok'));
        wp_die();
    }

    public static function ping(): ?array
    {
        // Keep cookies as they are required on some servers
        $args = [
            'cookies' => $_COOKIE,
        ];

        $url = admin_url('admin-ajax.php') . '?action=a2wl_ping';
        $request = wp_remote_post($url, $args);

        // WP-level error (DNS, SSL, timeout, etc.)
        if (is_wp_error($request)) {
            return ResultBuilder::buildError($request->get_error_message());
        }

        $code = intval($request['response']['code']);
        $body = isset($request['body']) ? $request['body'] : '';

        // Detect Cloudflare challenge page
        if ($code === 403 && self::isCloudflareChallenge($body)) {
            return ResultBuilder::buildError(
                'Cloudflare is blocking this AJAX request. '
                . 'To fix this, please add a Firewall Rule in Cloudflare that allows POST '
                . 'requests to /wp-admin/admin-ajax.php. '
                . 'This is required for WordPress AJAX to work correctly.'
            );
        }

        // Non-200 HTTP response
        if ($code !== 200) {
            return ResultBuilder::buildError(
                $code . ' ' . $request['response']['message']
            );
        }

        // Decode JSON response
        return json_decode($body, true);
    }

    /**
     * Detects Cloudflare challenge pages by scanning the HTML body.
     *
     * @param string $body
     * @return bool
     */
    private static function isCloudflareChallenge(string $body): bool
    {
        if ($body === '') {
            return false;
        }

        // Common Cloudflare challenge markers
        $markers = [
            'Just a moment...',
            'cf_chl_',
            '__cf_chl_',
            '/cdn-cgi/challenge-platform/',
            'Ray ID',
            'cloudflare'
        ];

        foreach ($markers as $marker) {
            if (stripos($body, $marker) !== false) {
                return true;
            }
        }

        return false;
    }

    public static function server_ping(): ?array
    {
        $ping_url = RequestHelper::build_request('ping', ['r' => wp_rand()]);
        $request = a2wl_remote_get($ping_url);

        if (is_wp_error($request)) {
            // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
            if (file_get_contents($ping_url)) {
                $result = ResultBuilder::buildError('a2wl_remote_get error');
            } else {
                $result = ResultBuilder::buildError($request->get_error_message());
            }
        } else if (intval($request['response']['code']) != 200) {
            $result = ResultBuilder::buildError(
                $request['response']['code']." ".$request['response']['message']
            );
        } else {
            $result = json_decode($request['body'], true);
        }

        return $result;
    }

    public static function hasMbstring(): bool
    {
        return extension_loaded('mbstring') && function_exists('mb_convert_encoding');
    }

    public static function php_check(): array
    {
        if (PHP_VERSION_ID < 80000) {
            return ResultBuilder::buildError('PHP version must be 8.0 or higher.');
        }

        if (!self::hasMbstring()) {
            return ResultBuilder::buildError('mbstring extension is not available. Please enable it.');
        }

        return ResultBuilder::buildOk();
    }

    public static function php_dom_check(){
        if (class_exists('DOMDocument')) {
            return ResultBuilder::buildOk();
        } else{
            return ResultBuilder::buildError('PHP DOM is disabled');
        }
    }
}