<?php

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

namespace TYPO3\CMS\Beuser\Domain\Repository;

use TYPO3\CMS\Beuser\Domain\Model\BackendUser;
use TYPO3\CMS\Core\Authentication\AbstractUserAuthentication;
use TYPO3\CMS\Core\Session\Backend\HashableSessionBackendInterface;
use TYPO3\CMS\Core\Session\Backend\SessionBackendInterface;
use TYPO3\CMS\Core\Session\SessionManager;
use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * @internal This class is a TYPO3 Backend implementation and is not considered part of the Public TYPO3 API.
 */
class BackendUserSessionRepository
{
    protected SessionBackendInterface $sessionBackend;

    public function __construct()
    {
        $this->sessionBackend = GeneralUtility::makeInstance(SessionManager::class)->getSessionBackend('BE');
    }

    /**
     * Find all active sessions for all backend users
     */
    public function findAllActive(): array
    {
        $allSessions = $this->sessionBackend->getAll();

        // Map array to correct keys
        $allSessions = array_map(
            static function ($session) {
                return [
                    'id' => $session['ses_id'], // this is the hashed sessionId
                    'ip' => $session['ses_iplock'],
                    'timestamp' => $session['ses_tstamp'],
                    'ses_userid' => $session['ses_userid'],
                ];
            },
            $allSessions
        );

        // Sort by timestamp
        usort($allSessions, static function ($session1, $session2) {
            return $session1['timestamp'] <=> $session2['timestamp'];
        });

        return $allSessions;
    }

    /**
     * Find Sessions for specific BackendUser
     *
     * @return array
     */
    public function findByBackendUser(BackendUser $backendUser)
    {
        $allActive = $this->findAllActive();

        return array_filter(
            $allActive,
            static function ($session) use ($backendUser) {
                return (int)$session['ses_userid'] === $backendUser->getUid();
            }
        );
    }

    public function getPersistedSessionIdentifier(AbstractUserAuthentication $userObject): string
    {
        $currentSessionId = $userObject->getSession()->getIdentifier();
        if ($this->sessionBackend instanceof HashableSessionBackendInterface) {
            $currentSessionId = $this->sessionBackend->hash($currentSessionId);
        }
        return $currentSessionId;
    }

    public function terminateSessionByIdentifier(string $sessionIdentifier): bool
    {
        return $this->sessionBackend->remove($sessionIdentifier);
    }
}
