<?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\Translation\MessageCatalogue;
use Symfony\Component\Translation\Exception\InvalidResourceException;
use Symfony\Component\Translation\Exception\NotFoundResourceException;
use Symfony\Component\Config\Resource\FileResource;

/**
 * QtFileLoader loads translations from QT Translations XML files.
 *
 * @author Benjamin Eberlei <kontakt@beberlei.de>
 *
 * @api
 */
class QtFileLoader implements LoaderInterface
{
    /**
     * {@inheritdoc}
     *
     * @api
     */
    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));
        }

        $dom = new \DOMDocument();
        $current = libxml_use_internal_errors(true);
        if (!@$dom->load($resource, defined('LIBXML_COMPACT') ? LIBXML_COMPACT : 0)) {
            throw new InvalidResourceException(implode("\n", $this->getXmlErrors()));
        }

        $xpath = new \DOMXPath($dom);
        $nodes = $xpath->evaluate('//TS/context/name[text()="'.$domain.'"]');

        $catalogue = new MessageCatalogue($locale);
        if ($nodes->length == 1) {
            $translations = $nodes->item(0)->nextSibling->parentNode->parentNode->getElementsByTagName('message');
            foreach ($translations as $translation) {
                $catalogue->set(
                    (string) $translation->getElementsByTagName('source')->item(0)->nodeValue,
                    (string) $translation->getElementsByTagName('translation')->item(0)->nodeValue,
                    $domain
                );
                $translation = $translation->nextSibling;
            }
            $catalogue->addResource(new FileResource($resource));
        }

        libxml_use_internal_errors($current);

        return $catalogue;
    }

    /**
     * Returns the XML errors of the internal XML parser
     *
     * @return array An array of errors
     */
    private function getXmlErrors()
    {
        $errors = array();
        foreach (libxml_get_errors() as $error) {
            $errors[] = sprintf('[%s %s] %s (in %s - line %d, column %d)',
                LIBXML_ERR_WARNING == $error->level ? 'WARNING' : 'ERROR',
                $error->code,
                trim($error->message),
                $error->file ? $error->file : 'n/a',
                $error->line,
                $error->column
            );
        }

        libxml_clear_errors();
        libxml_use_internal_errors(false);

        return $errors;
    }
}