<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2021 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\ORM\Value;

use Espo\ORM\{
    Entity,
    EventDispatcher,
};

class ValueAccessorFactory
{
    private $generalValueFactory = null;

    private $generalAttributeExtractor = null;

    private $valueFactoryFactory;

    private $attributeExtractorFactory;

    private $eventDispatcher;

    public function __construct(
        ValueFactoryFactory $valueFactoryFactory,
        AttributeExtractorFactory $attributeExtractorFactory,
        EventDispatcher $eventDispatcher
    ) {
        $this->valueFactoryFactory = $valueFactoryFactory;
        $this->attributeExtractorFactory = $attributeExtractorFactory;
        $this->eventDispatcher = $eventDispatcher;

        $this->subscribeToMetadataUpdate();
    }

    public function create(Entity $entity): ValueAccessor
    {
        $generalValueFactory = $this->getGeneralValueFactory();

        $generalAttributeExtractor = $this->getGeneralAttributeExtractor();

        return new ValueAccessor($entity, $generalValueFactory, $generalAttributeExtractor);
    }

    private function getGeneralValueFactory(): GeneralValueFactory
    {
        if (!$this->generalValueFactory) {
            $this->generalValueFactory = new GeneralValueFactory(
                $this->valueFactoryFactory
            );
        }

        return $this->generalValueFactory;
    }

    private function getGeneralAttributeExtractor(): GeneralAttributeExtractor
    {
        if (!$this->generalAttributeExtractor) {
            $this->generalAttributeExtractor = new GeneralAttributeExtractor(
                $this->attributeExtractorFactory
            );
        }

        return $this->generalAttributeExtractor;
    }

    private function subscribeToMetadataUpdate(): void
    {
        $this->eventDispatcher->subscribeToMetadataUpdate(
            function () {
                $this->generalValueFactory = null;
                $this->generalAttributeExtractor = null;
            }
        );
    }
}