<?php
/**
 * Content  component
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage content
 */

/**
 * load base class
 */
WBClass::load('WBFormProcessor');

/**
 * Content  component
 *
 * @version 1.0.0
 * @package WB
 * @subpackage content
 */
class WBContent extends WBFormProcessor
{
    /**
     * my part
     * @var string
     */
    protected $part = 'main';

   /**
    * my parameter list
    * @var array
    */
    protected $config = array('tmplDir' => '');

    /**
     * variables meant to bubble up
     * @var array
     */
    protected $bubbles =   array();

    /**
     * tell whether to use dynanmic bubbles
     * @var bool
     */
    protected $useBubbles   =   true;

    /**
     * user object
     * @var WBUser_Auth
     */
    protected $user;

    /**
     * whether to use template engine or not
     * @var bool
     */
    protected $withFormTmpl = true;

    /**
     * template engine
     * @var patTemplate
     */
    protected $tmpl;

    /**
     * session object
     * @var patSession_Storage
     */
    protected $sess;

    /**
     * request object
     * @var WBRequest
     */
    protected $req;

    /**
     * This content component is cachable
     * @var bool
     */
    protected $cachable = true;

    /**
     * anonymous user
     */
    const GROUP_ANON = '__anonymous';

   /**
    * constructor
    *
    * Configure template folder by class name
    *
    * Instantiate a vew standard objects
    *  - req:  request object
    *  - tmpl: template engine patTemplate
    *  - sess: session storage patSession_Storage
    *  - user: current user
    *
    * Make sure all subclasses execute this constructor
    */
    public function __construct()
    {
        $this->config['tmplDir']    =   str_replace('_', '/', substr(get_class($this), strlen(__CLASS__) + 1));

        $this->req  =   WBClass::create('WBRequest');
        $this->sess =   WBClass::create('patSession');
        $this->tmpl =   WBClass::create('patTemplate');

        WBClass::load('WBUser');
        $this->user =   WBUser::getCurrent();
    }

    /**
     * location of form config
     *
     * Return sub directory where form element definitions are located
     *
     * @return string folder
     */
    protected function getFormConfigDir()
    {
        return strtolower(str_replace('_', '/', substr(get_class($this), strlen(__CLASS__) + 1)));
    }

    /**
     * Set config values
     *
     * Setup and configure this content component.
     *
     * @param string $part named part where the content is located
     * @param array configuration options
     * @param array bubbles
     * @return bool true on success
     */
    public function configure($part, $config, $bubbles)
    {
        if (!is_array($config)) {
            $config =   array();
        }

        if (!is_array($bubbles)) {
            if (1 > intval($bubbles)) {
                $this->useBubbles   =   false;
            }
            $bubbles    =   array();
        }

        $this->part     =   $part;
        $this->config   =   array_merge($this->config, $config);
        $this->bubbles  =   $bubbles;

        // force leading slash
        if (strlen($part) && $part[0] != '/') {
            $part   =   '/' . $part;
        }

        // add user data and group membership
        if ($this->user && $this->user->isAuthenticated()) {
            $this->tmpl->addGlobalVars($this->user->getData(), 'user_current_');

            $groups =   array();
            foreach ($this->user->getGroups() as $gid => $gname) {
                $groups[$gname] =   '1';
            }
            $this->tmpl->addGlobalVars($groups, 'user_current_group_');
        }

        // misc global variables
        $globals    =   array(
                                'request_path'  =>  $this->req->path,
                                'content_path'  =>  $part,
                                'session_name'  =>  $this->sess->getName(),
                                'session_id'    =>  $this->sess->getId(),
                                );
        $this->tmpl->addGlobalVars($globals);

        $this->init();
        return true;
    }

    /**
     * 2nd constructor
     *
     * Called after configuration was done
     */
    protected function init()
    {
    }

    /**
     * run
     *
     * run component
     *
     * @return array parameter list
     */
    public function run()
    {
        return $this->config;
    }

    /**
     * Receive output
     *
     * Fetch output of this content component. Implement standard behaviour:
     * get parsed template named "snippet".
     *
     * @return string
     */
    public function getString()
    {
        return $this->tmpl->getParsedTemplate('snippet');
    }

    /**
     * Download file
     *
     * CAUTION: This method usually does not return!
     * If file exists, it will send file to browser and exit programme!
     *
     * @param string $file
     * @param string $type mime-type
     * @param string $disposition file name for content disposition
     */
    protected function downloadFile($file, $type = 'text/xml', $disposition = '')
    {
        $res  =   WBClass::create('WBResponse');
        /** @var $res WBResponse */
        if (!file_exists($file)) {
            $res->addHeader('Content-Type', 'text/plain');
            $res->add('not found');
            $res->send($this->req);
            exit(0);
        }

        // switch off compression - otherwise complete download files are loaded to RAM
        WBParam::set('wb/response/compress', 0);
        WBParam::set('wb/cache/use', 0);

        $res->addHeader('Content-Type', $type);
        $res->addHeader('Cache-Control', 'no-cache, must-revalidate');
        $res->addHeader('Expires', gmdate('D, d M Y H:i:s') . ' GMT');

        if (!empty($disposition)) {
            $res->addHeader('Content-Disposition', 'inline; filename="' . $disposition . '"');
        }

        $res->addStream(fopen($file, 'r'), md5_file($file));
        $res->send($this->req);
        exit(0);
    }


    /**
     * Get response status code
     *
     * @return int
     */
    public function getStatusCode()
    {
        return 200;
    }

    /**
     * fetch variables to bubble up
     *
     * @return array parameter list
     */
    public function getBubbles()
    {
        if ($this->useBubbles) {
            return $this->bubbles;
        }

        return array();
    }

    /**
     * tell whether this component is cachable
     *
     * @return bool
     */
    public function isCachable()
    {
        return $this->cachable;
    }

    /**
     * load templates from file
     *
     * @param string $tmpl
     * @param bool local templates
     */
    protected function loadTemplates($tmpl, $local = true)
    {
        if ($local) {
            $tmpl   =   $this->config['tmplDir'] . '/' . $tmpl;
        }
        return $this->tmpl->readTemplatesFromInput($tmpl . '.tmpl');
    }

    /**
     * Add Config to Template
     *
     * Most content components make the current config available as template variables
     *
     * @see addGlobalVars()
     * @return bool
     */
    protected function addConfigAsGlobalVars()
    {
        return $this->addGlobalVars($this->config, 'CONFIG_');
    }

    /**
     * Add Scala Values as Global Vars
     *
     * Auxilliary method to add template variables without notices.
     *
     * @param array $vars
     * @param string prefix - optional
     * @return bool
     */
    protected function addGlobalVars($vars, $prefix = '')
    {
        $tmp    =   array();
        foreach ($vars as $k => $v) {
            if (is_scalar($v)) {
                $tmp[$k]    =   $v;
                continue;
            }

            if (is_array($v)) {
                $tmp[$k . '_count'] =   count($v);
            }


        }
        return $this->tmpl->addGlobalVars($tmp, $prefix);
    }

    /**
     * Verify if user is in group
     *
     * Checks if user is in specified group
     *
     * @param string $name group name to validate
     * @param bool $id whether $name is the group's id
     * @return bool true in case user is member of given group
     */
    protected function isUserInGroup($name, $id = false)
    {
        if (self::GROUP_ANON == $name) {
            return true;
        }
        return $this->user->isInGroup($name, $id);
    }

    /**
     * Login user if not already logged in
     *
     * Check for authentication and try to login.
     * CAUTION: this uses form processor, therefore form defintion and templates are required
     *
     * @return bool true for authenticated users
     */
    protected function autoAuthenticate()
    {
        if ($this->user->isAuthenticated()) {
            return true;
        }
        $this->processForm('login');
        return $this->user->isAuthenticated();
    }

    /**
     * login user
     *
     * Use form data to login
     */
    public function onLoginValid($form, $values)
    {
        $this->user->login($values);
        if ($this->user->isAuthenticated()) {
            WBClass::load('WBService');
            WBService::addEvent('login');
            return false;
        }
        return true;
    }
}