<?php
/**
 * Ditaa Plugin - Action Component
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     i-net software <tools@inetsoftware.de>
 * @author     Gerry Weissbach <gweissbach@inetsoftware.de>
 */

// must be run within Dokuwiki
if(!defined('DOKU_INC')) die();
if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN', DOKU_INC . 'lib/plugins/');

/**
 * Class action_plugin_ditaa
 */
class action_plugin_ditaa extends DokuWiki_Action_Plugin {

    /**
     * Registers a callback function for a given event
     *
     * @param Doku_Event_Handler $controller
     */
    public function register(Doku_Event_Handler $controller) {
        // Download of a file

        $controller->register_hook('MEDIA_SENDFILE', 'BEFORE', $this, 'ditaa_sendfile');
        $controller->register_hook('FETCH_MEDIA_STATUS', 'BEFORE', $this, 'ditaa_sendfile_not_found');
    }

    /**
     * Handle Ditaa file requests
     *
     * @param Doku_Event $event
     * @param $args
     */
    public function ditaa_sendfile(Doku_Event $event, $args) {
        global $conf;
        global $INPUT;

        if(!$INPUT->str('ditaa')) return;

        /** @var syntax_plugin_ditaa $plugin */
        $plugin = plugin_load('syntax', 'ditaa');

        $event->data['file'] = $plugin->_imgfile($INPUT->str('ditaa'));
        $event->data['mime'] = 'image/png';
        $event->data['download'] = false;

        if(!$event->data['file']) {
            $event->data['file'] = dirname(__FILE__) . '/broken.png';
            $event->data['status'] = 404;
            $event->data['statusmessage'] = 'Not Found';
        }

        header('Expires: ' . gmdate("D, d M Y H:i:s", time() + max($conf['cachetime'], 3600)) . ' GMT');
        header('Cache-Control: public, proxy-revalidate, no-transform, max-age=' . max($conf['cachetime'], 3600));
        header('Pragma: public');
    }

    /**
     * If a file has not been found yet, we should try to check if this can be solved
     * via the ditaa renderer
     *
     * @param Doku_Event $event
     * @param $args
     * @return bool
     */
    public function ditaa_sendfile_not_found(Doku_Event $event, $args) {
        global $INPUT;
        if($event->data['status'] >= 500 || !$INPUT->str('ditaa')) {
            return true;
        }
        $event->data['status'] = 200;
        $event->data['statusmessage'] = 'OK';
        return true;
    }
}