<?php

declare(strict_types=1);

namespace OaiSymfony\OAI;

use \DOMDocument;

use function Symfony\Component\String\b;

/**
 * Creates the base XML document containing dynamically generated responses
 * @todo different create functions depending on request type? e.g. GetRecord
 */
final class OaiBase
{
    /**
     * @param string $content The dynamically generated XML response
     * @param string $nodeName The root node name to be imported
     */
    public static function create(string $content, string $nodeName, string $metadataFormat = 'oai_dc'): string
    {
        $main = new DOMDocument(encoding: 'UTF-8');
        $main->formatOutput = true;
        $xslt = $main->createProcessingInstruction('xml-stylesheet', 'type="text/xsl" href="/xslt/oai2.xsl"');
        $main->appendChild($xslt);

        $imported = new DOMDocument(encoding: 'UTF-8');
        $imported->loadXML(b($content)->toUnicodeString()->toString(), LIBXML_NOWARNING);
        $node = $imported->getElementsByTagName($nodeName)->item(0);

        $root = $main->createElement('OAI-PMH');
        $root->setAttribute('xmlns', 'http://www.openarchives.org/OAI/2.0/');
        $root->setAttribute('xmlns:xsi', 'http://www.w3.org/2001/XMLSchema-instance');
        $root->setAttribute('xsi:schemaLocation', 'http://www.openarchives.org/OAI/2.0/ http://www.openarchives.org/OAI/2.0/OAI-PMH.xsd');
        $responseDate = $main->createElement('responseDate', date("Y-m-d\TH:i:s\Z"));                                   
        $root->appendChild($responseDate);
        $request = $main->createElement('request', 'https://www.yourdomain.com/oai');

        if ($nodeName !== 'error') {
            $request->setAttribute('verb', $nodeName);
            // TODO dynamic metadata prefix!
            $request->setAttribute('metadataPrefix', $metadataFormat);
        }

        $root->appendChild($request);
        $main->appendChild($root);
        $node = $main->importNode($node, true);
        $root->appendChild($node);

        // To avoid error when importing XML from RecordOaiDatacite... (why??)
        if ($metadataFormat === 'oai_datacite') {
            $oai_datacite = $main->getElementsByTagName('oai_datacite')->item(0);
            $resource = $main->getElementsByTagName('resource')->item(0);
            $xmlns = $main->createAttribute('xmlns');
            $xsi = $main->createAttribute('xsi:schemaLocation');
            $xmlnsRes = $main->createAttribute('xmlns');
            $xsiRes = $main->createAttribute('xsi:schemaLocation');
            $xsi->value = "http://schema.datacite.org/oai/oai-1.1/ http://schema.datacite.org/oai/oai-1.1/oai.xsd";
            $xmlns->value = "http://schema.datacite.org/oai/oai-1.1/";
            $oai_datacite->appendChild($xmlns);
            $oai_datacite->appendChild($xsi);
            $xmlnsRes->value = "http://datacite.org/schema/kernel-3";
            $xsiRes->value = "http://datacite.org/schema/kernel-3 http://schema.datacite.org/meta/kernel-3/metadata.xsd";
            $resource->appendChild($xmlnsRes);
            $resource->appendChild($xsiRes);
        }

        return $main->saveXML();
    }
}