<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\CmsGraphQl\Model\Resolver\Block;

use Magento\Cms\Api\Data\BlockInterface;
use Magento\Cms\Model\Block;
use Magento\GraphQlResolverCache\Model\Resolver\Result\Cache\IdentityInterface;

class ResolverCacheIdentity implements IdentityInterface
{
    /**
     * @var string
     */
    private $cacheTag = Block::CACHE_TAG;

    /**
     * @inheritdoc
     */
    public function getIdentities($resolvedData, ?array $parentResolvedData = null): array
    {
        $ids = [];
        $items = $resolvedData['items'] ?? [];
        foreach ($items as $item) {
            if (is_array($item) && !empty($item[BlockInterface::BLOCK_ID])) {
                $ids[] = sprintf('%s_%s', $this->cacheTag, $item[BlockInterface::BLOCK_ID]);
                $ids[] = sprintf('%s_%s', $this->cacheTag, $item[BlockInterface::IDENTIFIER]);
            }
        }

        return $ids;
    }
}