<?php

// (c) Copyright by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id$

/**
 * Smarty plugin
 * @package Smarty
 * @subpackage plugins
 *
 * \brief Smarty plugin to display content only to some groups, friends or combination of all per specified user(s)
 * (if user is not specified, current user is used)
 * ex.: {display groups='Anonymous,-Registered,foo' friends=$f_42[ error='You may not see this item']}$f_1...$f_9///else///Become friend with $_42 first{/display}
 * TODO : Re-implement friend filter
 */
function smarty_block_display($params, $content, $smarty, &$repeat)
{
    global $prefs, $user;
    $userlib = TikiLib::lib('user');

    if ($repeat) {
        return;
    }
    $ok = true;
    if (! empty($params['groups'])) {
        $groups = explode(',', $params['groups']);
        $userGroups = $userlib->get_user_groups($user);
    }

    $content = explode('///else///', $content);

    if (! empty($params['error'])) {
        $errmsg = $params['error'];
    } elseif (empty($params['error']) && isset($groups)) {
        $errmsg = '';
    } else {
        $errmsg = 'Smarty block.display.php: Missing error param';
    }

    $anon = false; // see the workaround to exclude Registered below

    foreach ($groups as $gr) {
        $gr = trim($gr);
        if ($gr == 'Anonymous') {
            $anon = true;
        }
        if (substr($gr, 0, 1) == '-') {
            $nogr = substr($gr, 1);
            if ((in_array($nogr, $userGroups) && $nogr != 'Registered') or (in_array($nogr, $userGroups) && $nogr == 'Registered' && $anon == true)) {
                // workaround to display to Anonymous only if Registered excluded (because Registered includes Anonymous always)
                $ok = false;
                $anon = false;
            }
        } elseif (! in_array($gr, $userGroups) && $anon == false) {
            $ok = false;
        } else {
            $ok = true;
        }
    }

    /* is it ok ? */
    if (! $ok) {
        if (isset($content[1])) {
            return $content[1];
        } else {
            return $errmsg;
        }
    } else {
        return $content[0];
    }
}