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<?php
/**
 * Class used to determine if the core, or modules, need to be updated
 */

defined('ICMS_ROOT_PATH') or die("ImpressCMS root path not defined");

/**
 * IcmsVersionChecker
 *
 * Class used to check if the ImpressCMS install is up to date
 *
 * @copyright   The ImpressCMS Project http://www.impresscms.org/
 * @license     http://www.gnu.org/licenses/old-licenses/gpl-2.0.html GNU General Public License (GPL)
 * @category    ICMS
 * @package     Core
 * @subpackage  VersionChecker
 * @since       1.0
 * @author      marcan <marcan@impresscms.org>
 * @version     $Id: Versionchecker.php 11603 2012-02-26 08:45:50Z fiammy $
 */
class icms_core_Versionchecker {

    /*
     * errors
     * @public $errors array
     */
    public $errors = array();

    /*
     * URL of the XML containing version information
     * @public $version_xml string
     */
    public $version_xml = "http://www.impresscms.org/impresscms_version_branch13.xml";

    /*
     * Time before fetching the $version_xml again and store it in $cache_version_xml
     * @public $cache_time integer
     * @todo set this to a day at least or make it configurable in System Admin > Preferences
     */
    public $cache_time=1;

    /*
     * Name of the latest version
     * @public $latest_version_name string
     */
    public $latest_version_name;

    /*
     * Name of installed version
     * @private $installed_version_name string
     */
    public $installed_version_name;

    /*
     * Number of the latest build
     * @public $latest_build integer
     */
    public $latest_build;

    /*
     * Status of the latest build
     *
     * 1  = Alpha
     * 2  = Beta
     * 3  = RC
     * 10 = Final
     *
     * @public $latest_status integer
     */
    public $latest_status;

    /*
     * URL of the latest release
     * @public $latest_url string
     */
    public $latest_url;

    /*
     * Changelog of the latest release
     * @public $latest_changelog string
     */
    public $latest_changelog;

    /**
     * Constructor
     *
     * @return  void
     *
     */
    public function __construct() {
        $this->installed_version_name = ICMS_VERSION_NAME;
    }

    /**
     * Access the only instance of this class
     *
     * @static
     * @staticvar object
     *
     * @return  object
     *
     */
    static public function &getInstance() {
        static $instance;
        if (!isset($instance)) {
            $instance = new self();
        }
        return $instance;
    }

    /**
     * Check for a newer version of ImpressCMS
     *
     * @return  TRUE if there is an update, FALSE if no update OR errors occured
     *
     */
    public function check() {

        // Create a new instance of the SimplePie object
        $feed = new icms_feeds_Simplerss();
        $feed->set_feed_url($this->version_xml);
        $feed->set_cache_duration(0);
        $feed->set_autodiscovery_level(SIMPLEPIE_LOCATOR_NONE);
        $feed->init();
        $feed->handle_content_type();

        if (!$feed->error) {
            $versionInfo['title'] = $feed->get_title();
            $versionInfo['link'] = $feed->get_link();
            $versionInfo['image_url'] = $feed->get_image_url();
            $versionInfo['image_title'] = $feed->get_image_title();
            $versionInfo['image_link'] = $feed->get_image_link();
            $feed_item = $feed->get_item(0);
            $versionInfo['description'] = $feed_item->get_description();
            $versionInfo['permalink'] = $feed_item->get_permalink();
            $versionInfo['title'] = $feed_item->get_title();
            $versionInfo['content'] = $feed_item->get_content();
            $guidArray = $feed_item->get_item_tags('', 'guid');
            $versionInfo['guid'] = $guidArray[0]['data'];
        } else {
            $this->errors[] = _AM_VERSION_CHECK_RSSDATA_EMPTY;
            return false;
        }
        $this->latest_version_name = $versionInfo['title'];
        $this->latest_changelog = $versionInfo['description'];
        $build_info = explode('|', $versionInfo['guid']);
        $this->latest_build = $build_info[0];
        $this->latest_status = $build_info[1];

        if ($this->latest_build > ICMS_VERSION_BUILD) {
            // There is an update available
            $this->latest_url = $versionInfo['link'];
            return true;
        }
        return false;
    }

    /**
     * Gets all the error messages
     *
     * @param   $ashtml bool    return as html?
     * @return  mixed
     */
    public function getErrors($ashtml=true) {
        if (!$ashtml) {
            return $this->errors;
        } else {
            $ret = '';
            if (count($this->errors) > 0) {
                foreach ($this->errors as $error) {
                    $ret .= $error.'<br />';
                }
            }
            return $ret;
        }
    }
}