<?php
/**
 * Populate form element's attribute conditional
 *
 * $Id$
 *
 * @author gERD Schaufelberger <gerd@php-tools.net>
 * @license PHP License
 * @package WB
 * @subpackage db
 */

WBClass::load('WBDatasource_FormAttribute'
, 'WBUser');

/**
 * Populate form element's attribute conditional
 *
 *
 * @version 1.0.0
 * @package WB
 * @subpackage db
 */
class WBDatasource_FormAttribute_SwitchByGroup extends WBDatasource_FormAttribute
{
    /**
     * configuration parameter
     *
     * - group List of groups, negate with ! in front. Only set user id of user in group or not in groups
     * - switch named attribute like "disabled". used for value lists
     * - value switch target value
     * @var array
     */
    protected $config   =   array(
                                'group'     =>  array(),
                                'switch'    =>  'disabled',
                                'value'     =>  'no'
                            );

    /**
     * get attribute's value
     *
     *
     *
     * @param mixed $current actual attribute value
     * @return array
     */
    protected function getAttributeValue($current)
    {
        $user   =   WBUser::getCurrent();
        if (empty($this->config['group'])) {
            return $current;
        }

        foreach ($this->config['group'] as $g) {
            $rel    =   true;
            if (0 == strncmp('!', $g, 1)) {
                $rel    =   false;
                $g      =   substr($g, 1);
            }

            if ($user->isInGroup($g) !== $rel) {
                return $current;
            }
        }

        // just the disabled switch
        if (!is_array($current)) {
            return $this->config['value'];
        }

        // value list
        foreach ($current as &$c) {
            $c[$this->config['switch']] =   $this->config['value'];
        }

        return $current;
    }
}