<?php
 
 /*
  * This file is part of the Symfony package.
  *
  * (c) Fabien Potencier <fabien@symfony.com>
  *
  * For the full copyright and license information, please view the LICENSE
  * file that was distributed with this source code.
  */
 
 namespace Symfony\Component\Translation\Loader;
 
 use Symfony\Component\Config\Resource\FileResource;
 use Symfony\Component\Config\Util\XmlUtils;
 use Symfony\Component\Translation\Exception\InvalidResourceException;
 use Symfony\Component\Translation\Exception\NotFoundResourceException;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Util\XliffUtils;
 
 /**
  * XliffFileLoader loads translations from XLIFF files.
  *
  * @author Fabien Potencier <fabien@symfony.com>
  */
 class XliffFileLoader implements LoaderInterface
 {
     /**
      * {@inheritdoc}
      */
     public function load($resource, $locale, $domain = 'messages')
     {
         if (!stream_is_local($resource)) {
             throw new InvalidResourceException(sprintf('This is not a local file "%s".', $resource));
         }
 
         if (!file_exists($resource)) {
             throw new NotFoundResourceException(sprintf('File "%s" not found.', $resource));
         }
 
         $catalogue = new MessageCatalogue($locale);
         $this->extract($resource, $catalogue, $domain);
 
         if (class_exists('Symfony\Component\Config\Resource\FileResource')) {
             $catalogue->addResource(new FileResource($resource));
         }
 
         return $catalogue;
     }
 
     private function extract($resource, MessageCatalogue $catalogue, $domain)
     {
         try {
             $dom = XmlUtils::loadFile($resource);
         } catch (\InvalidArgumentException $e) {
             throw new InvalidResourceException(sprintf('Unable to load "%s": %s', $resource, $e->getMessage()), $e->getCode(), $e);
         }
 
         $xliffVersion = XliffUtils::getVersionNumber($dom);
         if ($errors = XliffUtils::validateSchema($dom)) {
             throw new InvalidResourceException(sprintf('Invalid resource provided: "%s"; Errors: %s', $resource, XliffUtils::getErrorsAsString($errors)));
         }
 
         if ('1.2' === $xliffVersion) {
             $this->extractXliff1($dom, $catalogue, $domain);
         }
 
         if ('2.0' === $xliffVersion) {
             $this->extractXliff2($dom, $catalogue, $domain);
         }
     }
 
     /**
      * Extract messages and metadata from DOMDocument into a MessageCatalogue.
      *
      * @param \DOMDocument     $dom       Source to extract messages and metadata
      * @param MessageCatalogue $catalogue Catalogue where we'll collect messages and metadata
      * @param string           $domain    The domain
      */
     private function extractXliff1(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
     {
         $xml = simplexml_import_dom($dom);
         $encoding = strtoupper($dom->encoding);
 
         $namespace = 'urn:oasis:names:tc:xliff:document:1.2';
         $xml->registerXPathNamespace('xliff', $namespace);
 
         foreach ($xml->xpath('//xliff:file') as $file) {
             $fileAttributes = $file->attributes();
 
             $file->registerXPathNamespace('xliff', $namespace);
 
             foreach ($file->xpath('.//xliff:trans-unit') as $translation) {
                 $attributes = $translation->attributes();
 
                 if (!(isset($attributes['resname']) || isset($translation->source))) {
                     continue;
                 }
 
                 $source = isset($attributes['resname']) && $attributes['resname'] ? $attributes['resname'] : $translation->source;
                 // If the xlf file has another encoding specified, try to convert it because
                 // simple_xml will always return utf-8 encoded values
                 $target = $this->utf8ToCharset((string) ($translation->target ?? $translation->source), $encoding);
 
                 $catalogue->set((string) $source, $target, $domain);
 
                 $metadata = [
                     'source' => (string) $translation->source,
                     'file' => [
                         'original' => (string) $fileAttributes['original'],
                     ],
                 ];
                 if ($notes = $this->parseNotesMetadata($translation->note, $encoding)) {
                     $metadata['notes'] = $notes;
                 }
 
                 if (isset($translation->target) && $translation->target->attributes()) {
                     $metadata['target-attributes'] = [];
                     foreach ($translation->target->attributes() as $key => $value) {
                         $metadata['target-attributes'][$key] = (string) $value;
                     }
                 }
 
                 if (isset($attributes['id'])) {
                     $metadata['id'] = (string) $attributes['id'];
                 }
 
                 $catalogue->setMetadata((string) $source, $metadata, $domain);
             }
         }
     }
 
     private function extractXliff2(\DOMDocument $dom, MessageCatalogue $catalogue, string $domain)
     {
         $xml = simplexml_import_dom($dom);
         $encoding = strtoupper($dom->encoding);
 
         $xml->registerXPathNamespace('xliff', 'urn:oasis:names:tc:xliff:document:2.0');
 
         foreach ($xml->xpath('//xliff:unit') as $unit) {
             foreach ($unit->segment as $segment) {
                 $source = $segment->source;
 
                 // If the xlf file has another encoding specified, try to convert it because
                 // simple_xml will always return utf-8 encoded values
                 $target = $this->utf8ToCharset((string) (isset($segment->target) ? $segment->target : $source), $encoding);
 
                 $catalogue->set((string) $source, $target, $domain);
 
                 $metadata = [];
                 if (isset($segment->target) && $segment->target->attributes()) {
                     $metadata['target-attributes'] = [];
                     foreach ($segment->target->attributes() as $key => $value) {
                         $metadata['target-attributes'][$key] = (string) $value;
                     }
                 }
 
                 if (isset($unit->notes)) {
                     $metadata['notes'] = [];
                     foreach ($unit->notes->note as $noteNode) {
                         $note = [];
                         foreach ($noteNode->attributes() as $key => $value) {
                             $note[$key] = (string) $value;
                         }
                         $note['content'] = (string) $noteNode;
                         $metadata['notes'][] = $note;
                     }
                 }
 
                 $catalogue->setMetadata((string) $source, $metadata, $domain);
             }
         }
     }
 
     /**
      * Convert a UTF8 string to the specified encoding.
      */
     private function utf8ToCharset(string $content, string $encoding = null): string
     {
         if ('UTF-8' !== $encoding && !empty($encoding)) {
             return mb_convert_encoding($content, $encoding, 'UTF-8');
         }
 
         return $content;
     }
 
     private function parseNotesMetadata(\SimpleXMLElement $noteElement = null, string $encoding = null): array
     {
         $notes = [];
 
         if (null === $noteElement) {
             return $notes;
         }
 
         /** @var \SimpleXMLElement $xmlNote */
         foreach ($noteElement as $xmlNote) {
             $noteAttributes = $xmlNote->attributes();
             $note = ['content' => $this->utf8ToCharset((string) $xmlNote, $encoding)];
             if (isset($noteAttributes['priority'])) {
                 $note['priority'] = (int) $noteAttributes['priority'];
             }
 
             if (isset($noteAttributes['from'])) {
                 $note['from'] = (string) $noteAttributes['from'];
             }
 
             $notes[] = $note;
         }
 
         return $notes;
     }
 }