<?php
/**
 * MainWP Connect Lib
 *
 * MainWP Connect Lib functions.
 *
 * @package MainWP/Dashboard
 */

namespace MainWP\Dashboard;

use phpseclib3\Crypt\RSA;
use phpseclib3\Crypt\PublicKeyLoader;

/**
 * Class MainWP_Connect_Lib
 *
 * @package MainWP\Dashboard
 */
class MainWP_Connect_Lib { // phpcs:ignore Generic.Classes.OpeningBraceSameLine.ContentAfterBrace -- NOSONAR.

    /**
     * Private static variable to hold the single instance of the class.
     *
     * @static
     *
     * @var mixed Default null
     */
    private static $instance = null;

    /**
     * Method instance()
     *
     * Create a public static instance.
     *
     * @static
     * @return Instance class.
     */
    public static function instance() {
        if ( null === static::$instance ) {
            static::$instance = new self();
        }
        return static::$instance;
    }

    /**
     * Method get_class_name()
     *
     * Get Class Name.
     *
     * @return object Class name.
     */
    public static function get_class_name() {
        return __CLASS__;
    }

    /**
     * Class constructor.
     *
     * Run each time the class is called.
     */
    public function __construct() {
    }

    /**
     * Method create_connect_keys()
     *
     * Create connect keys.
     */
    public function create_connect_keys() {
        try {
            //phpcs:ignore -- note.
            // RSA::useInternalEngine(); // to use PHP engine.
            $private     = RSA::createKey();
            $public      = $private->getPublicKey();
            $private_key = $private->toString( 'PKCS1' );
            $public_key  = $public->toString( 'PKCS1' );
            return array(
                'pub'  => $public_key,
                'priv' => $private_key,
            );
        } catch ( \Exception $ex ) {
            // error happen.
        }
        return false;
    }

    /**
     * Method connect_sign()
     *
     * Sign to connect.
     *
     * @param mixed $data The data.
     * @param mixed $signature The signature.
     * @param mixed $privkey The privkey.
     * @param int   $site_id site id.
     */
    public static function connect_sign( $data, &$signature, $privkey, $site_id ) {
        try {
            $de_privkey = MainWP_Encrypt_Data_Lib::instance()->decrypt_privkey( $privkey, $site_id );
            if ( empty( $de_privkey ) ) {
                $de_privkey = $privkey; // compatible.
            }
            $private   = PublicKeyLoader::loadPrivateKey( $de_privkey );
            $signature = $private->sign( $data );
            if ( ! empty( $signature ) ) {
                return true;
            }
        } catch ( \Exception $ex ) {
            // error happen.
        }
        return false;
    }


    /**
     * Method is_use_fallback_sec_lib()
     *
     * Use php connect lib or not.
     *
     * @param mixed $website The website.
     */
    public static function is_use_fallback_sec_lib( $website ) {
        $use_fallback_lib = false;
        if ( is_object( $website ) && property_exists( $website, 'verify_method' ) ) {
            $val = (int) $website->verify_method;
            if ( 2 === $val ) {
                $use_fallback_lib = true;
            } elseif ( 3 === $val || empty( $val ) ) { // use general settings.
                $use_fallback_lib = ( 2 === (int) get_option( 'mainwp_verify_connection_method' ) ) ? true : false;
            }
        } else {
            $use_fallback_lib = ( 2 === (int) get_option( 'mainwp_verify_connection_method' ) ) ? true : false;
        }
        return $use_fallback_lib;
    }

    /**
     * Method get_connection_algo_settings_note()
     *
     * Get connection settings note.
     */
    public static function get_connection_algo_settings_note() {
        return esc_html__( 'Due to security reasons, switching back to OPENSSL_ALGO_SHA1 breaks the connection to your child site(s). It is required to deactivate & reactivate the MainWP Child plugin on child sites before you can reconnect them. Use OPENSSL_ALGO_SHA1 only if necessary.', 'mainwp' );
    }
}