<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2022 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * EspoCRM 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with EspoCRM. If not, see http://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 General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\Services;

use Espo\Core\{
    Utils\Metadata,
    Utils\Util,
    ORM\EntityManager,
    FieldProcessing\ListLoadProcessor,
};

use Espo\Entities\User;

use ArrayAccess;

class LastViewed
{
    private $metadata;

    private $entityManager;

    private $user;

    private $listLoadProcessor;

    public function __construct(
        Metadata $metadata,
        EntityManager $entityManager,
        User $user,
        ListLoadProcessor $listLoadProcessor
    ) {
        $this->metadata = $metadata;
        $this->entityManager = $entityManager;
        $this->user = $user;
        $this->listLoadProcessor = $listLoadProcessor;
    }

    /**
     * @param array{
     *   offset: ?int,
     *   maxSize: ?int,
     * } $params
     * @return array{
     *   total: int,
     *   collection: \Espo\ORM\Collection<\Espo\Entities\ActionHistoryRecord>,
     * }
     */
    public function getList(array $params): array
    {
        $repository = $this->entityManager->getRDBRepository('ActionHistoryRecord');

        $scopes = $this->metadata->get('scopes');

        $targetTypeList = array_filter(
            array_keys($scopes),
            function ($item) use ($scopes) {
                return !empty($scopes[$item]['object']) || !empty($scopes[$item]['lastViewed']);
            }
        );

        $offset = $params['offset'] ?? 0;
        $maxSize = $params['maxSize'] ?? 0;

        /** @var \Espo\ORM\Collection<\Espo\Entities\ActionHistoryRecord> $collection */
        $collection = $repository
            ->where([
                'userId' => $this->user->getId(),
                'action' => 'read',
                'targetType' => $targetTypeList,
            ])
            ->order('MAX:createdAt', 'DESC')
            ->select([
                'targetId',
                'targetType',
                'MAX:number',
                ['MAX:createdAt', 'createdAt'],
            ])
            ->group(['targetId', 'targetType'])
            ->limit($offset, $params['maxSize'] + 1)
            ->find();

        foreach ($collection as $entity) {
            $this->listLoadProcessor->process($entity);

            $entity->set('id', Util::generateId());
        }

        if (
            $maxSize &&
            is_countable($collection) &&
            count($collection) > $maxSize &&
            $collection instanceof ArrayAccess
        ) {
            $total = -1;

            unset($collection[count($collection) - 1]);
        }
        else {
            $total = -2;
        }

        return [
            'total' => $total,
            'collection' => $collection,
        ];
    }
}