<?php

declare(strict_types=1);

/**
* @author Amasty Team
* @copyright Copyright (c) Amasty (https://www.amasty.com)
* @package Export Orders for Magento 2
*/

namespace Amasty\OrderExport\Model\OptionSource;

use Amasty\ExportCore\Api\Config\EntityConfigInterface;
use Amasty\ExportCore\Export\Config\RelationConfigProvider;
use Magento\Framework\Data\OptionSourceInterface;
use Amasty\ExportCore\Export\Config\EntityConfigProvider;

class ParentEntity implements OptionSourceInterface
{
/**
* @var EntityConfigProvider
*/
private $entityConfigProvider;

/**
* @var RelationConfigProvider
*/
private $relationConfigProvider;

public function __construct(
EntityConfigProvider $entityConfigProvider,
RelationConfigProvider $relationConfigProvider
) {
$this->entityConfigProvider = $entityConfigProvider;
$this->relationConfigProvider = $relationConfigProvider;
}

public function toOptionArray()
{
$salesOrderConfig = $this->entityConfigProvider->get('sales_order');
$options = [
['value' => '', 'label' => __('-- Please Select --')],
['value' => $salesOrderConfig->getEntityCode(), 'label' => __($salesOrderConfig->getName())]
];

return array_merge(
$options,
$this->getNestedOptions($this->relationConfigProvider->get($salesOrderConfig->getEntityCode()))
);
}

public function getNestedOptions(?array $relationsConfig)
{
$result = [];
if (!empty($relationsConfig)) {
foreach ($relationsConfig as $relation) {
$childEntity = $this->entityConfigProvider->get($relation->getChildEntityCode());
$result[][] = ['value' => $childEntity->getEntityCode(), 'label' => __($childEntity->getName())];

if ($relation->getRelations()) {
$result[] = $this->getNestedOptions($relation->getRelations());
}
}
}

return array_merge([], ...$result);
}
}