<?php
/*
 * This file is part of Part-DB (https://github.com/Part-DB/Part-DB-symfony).
 *
 *  Copyright (C) 2019 - 2022 Jan Böhmer (https://github.com/jbtronics)
 *
 *  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/>.
 */

declare(strict_types=1);

namespace App\Entity\Contracts;

use DateTime;

interface TimeTravelInterface
{
    /**
     * Checks if this entry has informations which data has changed.
     *
     * @return bool true if this entry has informations about the changed data
     */
    public function hasOldDataInformations(): bool;

    /**
     * Returns the data the entity had before this log entry.
     */
    public function getOldData(): array;

    /**
     * Returns the the timestamp associated with this change.
     */
    public function getTimestamp(): DateTime;
}