<?php
/**
 * Process AJAX request
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage service
 */

WBClass::load('WBService'
    , 'WBHtml'
    , 'WBHtml_JS');

/**
 * Process AJAX request
 *
 * @todo move actual runner methods to command classes
 * @version 0.4.1
 * @package WB
 * @subpackage service
 */
class WBService_Ajax extends WBService
{
    /**
     * Display
     *
     * @param int $status
     * @param mixed $data to be send
     * @param string $checksum
     * @return bool true
     */
    public function run(&$status, &$data, &$checksum = null)
    {
        // switch off caching
        $this->res->useCache(false);
        $this->res->setMaxAge(null);
        if ($this->useI18n) {
            $this->res->addHeader('Content-Language', patI18n::getLocale(patI18n::LOCALE_TYPE_SHORT));
        }

        $mode   =   strtolower($this->req->getMeta('HTTP_X_AJAX', 'content'));

        /** @var $stat WBStatistic_View */
        $stat   =   WBClass::create('WBStatistic_View');
        $path   =   implode('/', $this->path);

        switch ($mode) {
            case 'wxmldialog':
                $ns     =   WBStatistic_View::NS_AJAX_WXMLDIALOG;
                $result =   $this->runWxmlDialog($status, $data, $checksum);
                break;

            case 'call':
                $ns     =   WBStatistic_View::NS_AJAX_CALL;
                $result =   $this->runCall($status, $data, $checksum);
                break;

            case 'content':
            default:
                $ns     =   WBStatistic_View::NS_AJAX_CONTENT;
                $result =   $this->runContent($status, $data, $checksum);
                break;
        }

        $stat->addPath($path, $ns);
        return $result;
    }

    /**
     * Wxml Dialog
     *
     * Display dialog of Wxml HTML editor
     *
     * @param int $status
     * @param mixed $data to be send
     * @param string $checksum
     * @return bool true
     */
    protected function runWxmlDialog(&$status, &$data, &$checksum = null)
    {
        if (empty($this->path)) {
            WBClass::load('WBException_Argument');
            throw WBException_Argument('Dialog name required but request path is empty', 1, __CLASS__);
        }
        
        $this->part =   strtolower(array_shift($this->path));
        if (empty($this->path)) {
            $this->path =   array('start');
        }
        $action =   strtolower(array_shift($this->path));

        /** @var WBWxml_Dialog */
        $dialog =   WBClass::create('WBWxml_Dialog_' . ucfirst($this->part));
        switch ($action) {
            case 'start':
                $select =   $this->req->get('sel', '');
                $this->sess->set(__CLASS__ . ':select', $select);
                $dialog->setSelect($select);
                
                $dialog->setValue($this->req->get('val', ''));
                $dialog->setAttributes($this->req->get('att', array()));
                $dialog->start();
                break;
                
            case 'cancel':
                break;

            case 'submit':
            default:
                $select =   $this->sess->get(__CLASS__ . ':select');
                $dialog->setSelect($select);
                $dialog->submit();
                break;
        }
        
        $data   =   $dialog->getHtml();
        $data   .=  $this->collectJavascript();

        $status =   200;
        return true;
    }
    
    /**
     * AJAX remote function call
     *
     * @param int $status
     * @param mixed $data to be send
     * @param string $checksum
     * @return bool true
     */
    protected function runCall(&$status, &$data, &$checksum = null)
    {
        if (count($this->path) < 2) {
            $status =   400;
            $data   =   'Invalid path to call AJAX method.';
            return true;
        }

        $clazz  =   'WBAjax_' . ucfirst(array_shift($this->path));
        $method =   array_shift($this->path);
        $log    =   array(
            'service'   =>  'ajaxcall',
            'action'    =>  'error',
            'msg'       =>  '',
            'class'     =>  $clazz,
            'method'    =>  $method
        );

        try {
            /** @var WBAjax */
            $obj    =   WBClass::create($clazz);
            $data   =   $obj->call($method);
            $data   .=  $this->collectJavascript();
            $this->addEventHeader();
            $this->res->addHeader('X-AJAX-Method', $method);
        } catch (WBException_Class $e) {
            $status         =   405;
            $data           =   'Invalid AJAX call';
            $log['msg']     =   $e->getMessage();
            $log['code']    =   $e->getCode();
            $this->log->err($log);
            return true;
        } catch (Exception $e) {
            $status         =   500;
            $data           =   'Failed to process request';
            $log['msg']     =   $e->getMessage();
            $log['code']    =   $e->getCode();
            $this->log->err($log);
            return true;
        }

        return true;
    }

    /**
     * Collect JavaScript
     *
     * Auxilliary function to fetch JavaScript scheduled for delivery.
     * Hence, this is just a shortcut that uses WBHtml
     *
     * @uses WBHtml
     * @return string
     */
    private function collectJavaScript()
    {
        $js     =   array();
        $js[]   =   WBHtml::get(WBHtml::AREA_HEAD);
        $js[]   =   WBHtml::get(WBHtml::AREA_FOOT);

        $onload             =   WBHtml::get(WBHtml::AREA_JS_ONLOAD);
        if (!empty($onload)) {
            $js[]   =  '<script type="text/javascript">' . $onload . '</script>';
        }
        return implode("\n", $js);
    }

    /**
     * Replace content
     *
     * Use current ptocesser to replace content
     *
     * @param int $status
     * @param mixed $data to be send
     * @param string $checksum
     * @return bool true
     */
    protected function runContent(&$status, &$data, &$checksum = null)
    {
        // try to find config parameters in session
        $paramName  =   md5($this->part . ':params:' . WBParam::get('wb/dir/base'));
        if ($this->sess->has($paramName)) {
            $sessConfig =   $this->sess->get($paramName);
        } else {
            $sessConfig =   $this->conf->get('content');
        }

        // load config from path - if given
        $pagePath           =   trim($this->req->getMeta('HTTP_X_AJAX_PATH', ''), '/');
        if (empty($pagePath)) {
            $pagePath   =   array();
        }
        else {
            $pagePath   =   explode('/', $pagePath);
        }

        if (!empty($pagePath)) {
            $this->findLangInPath($pagePath);
            $this->processPath($sessConfig, $pagePath);
            $this->processPathRequest($sessConfig, $pagePath);
        }
        $this->req->path    =   implode('/', $pagePath);

        // dig down to find actual
        $config     =   &$sessConfig['content'];
        if (isset($config[$this->path[0]])) {
            $config =   &$config[$this->path[0]];

            for ($i = 1; $i < count($this->path); ++$i) {
                $config =   &$config['params']['content'][$this->path[$i]];
            }
        }

        // invalid path!
        if (!isset($config['processor']) || empty($config['processor'])) {
            $status =   500;
            $data   =   'Invalid path! Maybe this was a mistake (or you were looking for vulnerable parts).';
            $log    =   array(
                'service'   =>  'ajaxcontent',
                'action'    =>  'error',
                'error'     =>  'invalid-path',
                'part'      =>  strval($this->part),
                'path'      =>  implode('/', $this->path)
            );
            $this->log->err($log);
            return true;
        }

        // override parameters
        if (isset($config['requestparams']) && is_array($config['requestparams'])){
            if (empty($config['requestparams']) || !is_array($config['requestparams'])) {
                $config['requestparams']    =   array();
            }
            foreach ($config['requestparams'] as $name => $get) {
                // there is no parameter name mapping
                if (is_numeric($name)) {
                    $name   =   $get;
                }

                // set default
                if (!isset($config['params'][$name])) {
                    $config['params'][$name] =   null;
                }

                // copy parameter from requeist parameter
                $config['params'][$name]   =   $this->req->get($get, $config['params'][$name]);
            }
        }

        $log    =   array(
            'service'   =>  'ajaxcontent',
            'action'    =>  'run',
            'error'     =>  'none',
            'part'      =>  strval($this->part),
            'path'      =>  implode('/', $this->path)
        );

        $log    =   array_merge($log, $config);
        $this->log->notice($log);

        if (empty($config['bubbles'])) {
            $config['bubbles']  =   array();
        }

        // run content component
        $this->cont         =   WBClass::create('WBContent_' . $config['processor']);
        $this->cont->configure(implode('/', $this->path), $config['params'], $config['bubbles']);
        $config['params']   =   $this->cont->run();

        // get string from content, afterwards add JavaScript and other HTML gadgets
        $data       =   $this->cont->getString();

        // force dynamic JavaScript Loader
        WBHtml_JS::getIncluded(true);

        // build complete data
        $data       =   WBHtml::get(WBHtml::AREA_HEAD)
                    .   $data
                    .   WBHtml::get(WBHtml::AREA_FOOT);

        // append onload javascript
        $onload             =   WBHtml::get(WBHtml::AREA_JS_ONLOAD);
        if (!empty($onload)) {
            $data   .=  '<script type="text/javascript">' . $onload . '</script>';
        }

        // HTTP status
        $status      =   200;

        $this->addEventHeader();
        $this->sess->set($paramName, $sessConfig);

        return true;
    }

    /**
     * inform client about events
     *
     * Tell client that event has happend and what to do now
     *
     */
    private function addEventHeader()
    {
        // inform client about events
        $q  =   $this->getEventQueue();
        if (empty($q)) {
            return;
        }

        $allowed    =   $this->conf->get('events');
        foreach ($q as $e) {
            if (!isset($allowed[$e['name']])) {
                continue;
            }

            $action =   $allowed[$e['name']];
            if (isset($action['override'])) {
                $this->res->addHeader('X-Site-Event', 'reload');
                return;
            }

            if (isset($action['forward'])) {
                $path   =   $action['forward'];
                if ($this->useI18n) {
                    $reqPath    =   $this->confLocale->get('locale/languages/requestpath', array());
                    $lang       =   patI18n::getLocale(patI18n::LOCALE_TYPE_LANG);
                    if (isset($reqPath[$lang]) && '__default' != $reqPath[$lang]) {
                        $path   =   $reqPath[$lang] . '/' . $path;
                    }
                }
                $this->res->addHeader('X-Site-Event', 'redirect');
                $this->res->addHeader('X-Site-Location', $path);
            }
        }
    }
}