<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM – Open Source CRM application.
 * Copyright (C) 2014-2026 EspoCRM, Inc.
 * Website: https://www.espocrm.com
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <https://www.gnu.org/licenses/>.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Core\Authentication\Logins;

use Espo\Core\Api\Request;
use Espo\Core\Authentication\AuthToken\AuthToken;
use Espo\Core\Authentication\Helper\UserFinder;
use Espo\Core\Authentication\Login;
use Espo\Core\Authentication\Login\Data;
use Espo\Core\Authentication\Result;
use Espo\Core\Authentication\Result\FailReason;
use Espo\Core\Utils\PasswordHash;
use Espo\Entities\User;

class Espo implements Login
{
    public const string NAME = 'Espo';

    public function __construct(
        private UserFinder $userFinder,
        private PasswordHash $passwordHash
    ) {}

    public function login(Data $data, Request $request): Result
    {
        $username = $data->getUsername();
        $password = $data->getPassword();
        $authToken = $data->getAuthToken();

        if (!$username) {
            return Result::fail(FailReason::NO_USERNAME);
        }

        if (!$password) {
            return Result::fail(FailReason::NO_PASSWORD);
        }

        if ($authToken) {
            $user = $this->findUserByAuthTokenData($username, $authToken);
        } else {
            $user = $this->userFinder->find($username);

            if ($user && !$this->passwordHash->verify($password, $user->getPassword())) {
                $user = null;
            }
        }

        if (!$user) {
            return Result::fail(FailReason::WRONG_CREDENTIALS);
        }

        if ($authToken && $user->getId() !== $authToken->getUserId()) {
            return Result::fail(FailReason::USER_TOKEN_MISMATCH);
        }

        return Result::success($user);
    }


    private function findUserByAuthTokenData(string $username, AuthToken $authToken): ?User
    {
        return $this->userFinder
            ->findByAuthTokenData($username, $authToken->getUserId(), $authToken->getPasswordVersion());
    }
}
