<?php

declare(strict_types=1);

namespace OaiSymfony\OAI\Verb;

use OaiSymfony\OAI\OaiBase;
use OaiSymfony\OAI\OaiError;
use AC\DB\Connection;
use Symfony\Component\Serializer\Encoder\XmlEncoder;
use Symfony\Component\Serializer\Normalizer\ObjectNormalizer;
use Symfony\Component\Serializer\Serializer;

/**
 * Represents a ListMetadataFormats response
 */
final class ListMetadataFormats
{
    public function __construct(
        private Serializer $serializer = new Serializer(),
    )
    {
        $this->serializer = new Serializer(
            [new ObjectNormalizer()],
            [new XmlEncoder()]
        );
    }
    /**
     * Returns the XML response
     */
    public function response(): string
    {
        $formats = $this->getValidFormats();

        $content = $this->serializer->encode(
            ['metadataFormat' => [...$formats]],
            'xml',
            [
                'xml_format_output' => true,
                'xml_root_node_name' => 'ListMetadataFormats',
                // Don't include the XML declaration, handled by OaiBase
                'encoder_ignored_node_types' => [
                    \XML_PI_NODE, 
                ],
            ]
        );

        return OaiBase::create($content, 'ListMetadataFormats');
    }
    /**
     * @return array<int,array<string,mixed>>
     */
    private function getValidFormats(): array
    {
        $dbConn = Connection::new();
        $queryBuilder = $dbConn->createQueryBuilder();

        $formats = $queryBuilder->select(
            'prefix as metadataPrefix',
            'schemaLoc as schema',
            'namespace as metadataNamespace',
            )
            ->from('metadata_formats')
            ->fetchAllAssociative();

        return $formats;
    }
}