<?php

namespace Wallabag\CoreBundle\Service;

use Wallabag\CoreBundle\Helper\Content;
use Wallabag\CoreBundle\Helper\Url;

final class Extractor
{
    public static function extract($url)
    {
        $pageContent = Extractor::getPageContent(new Url(base64_encode($url)));
        $title = ($pageContent['rss']['channel']['item']['title'] != '') ? $pageContent['rss']['channel']['item']['title'] : _('Untitled');
        $body = $pageContent['rss']['channel']['item']['description'];

        $content = new Content();
        $content->setTitle($title);
        $content->setBody($body);

        return $content;
    }
    /**
     * Get the content for a given URL (by a call to FullTextFeed)
     *
     * @param  Url   $url
     * @return mixed
     */
    public static function getPageContent(Url $url)
    {
        // Saving and clearing context
        $REAL = array();
        foreach ($GLOBALS as $key => $value) {
            if ($key != 'GLOBALS' && $key != '_SESSION' && $key != 'HTTP_SESSION_VARS') {
                $GLOBALS[$key]  = array();
                $REAL[$key]     = $value;
            }
        }
        // Saving and clearing session
        if (isset($_SESSION)) {
            $REAL_SESSION = array();
            foreach ($_SESSION as $key => $value) {
                $REAL_SESSION[$key] = $value;
                unset($_SESSION[$key]);
            }
        }

        // Running code in different context
        $scope = function () {
            extract(func_get_arg(1));
            $_GET = $_REQUEST = array(
                "url" => $url->getUrl(),
                "max" => 5,
                "links" => "preserve",
                "exc" => "",
                "format" => "json",
                "submit" => "Create Feed",
            );
            ob_start();
            require func_get_arg(0);
            $json = ob_get_contents();
            ob_end_clean();

            return $json;
        };

        // Silence $scope function to avoid
        // issues with FTRSS when error_reporting is to high
        // FTRSS generates PHP warnings which break output
        $json = @$scope(__DIR__."/../../../../vendor/wallabag/Fivefilters_Libraries/makefulltextfeed.php", array("url" => $url));

        // Clearing and restoring context
        foreach ($GLOBALS as $key => $value) {
            if ($key != "GLOBALS" && $key != "_SESSION") {
                unset($GLOBALS[$key]);
            }
        }
        foreach ($REAL as $key => $value) {
            $GLOBALS[$key] = $value;
        }

        // Clearing and restoring session
        if (isset($REAL_SESSION)) {
            foreach ($_SESSION as $key => $value) {
                unset($_SESSION[$key]);
            }

            foreach ($REAL_SESSION as $key => $value) {
                $_SESSION[$key] = $value;
            }
        }

        return json_decode($json, true);
    }
}