<?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 2.0.0
 * @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',
                                'table'         =>  '',
                                'clause'        =>  array(),
                                'option'        =>  array(),
                            );

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

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

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

        return $current;
    }

    /**
     * Check User in Group
     *
     * @param WBUser
     * @return bool
     */
    private function checkGroup($user)
    {
        if (empty($this->config['group'])) {
            return false;
        }

        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 false;
            }
        }

        return true;
    }

    /**
     * Check Table
     *
     * @param WBUser
     * @return bool
     */
    private function checkTable($user)
    {
        if (empty($this->config['table'])) {
            return true;
        }


        $table      =   WBClass::create('WBDatasource_Table');
        $clause     =   $this->config['clause'];
        if (!is_array($clause)) {
            $clause =   array();
        }
        $clause[]   =   array(
                                'field' =>  $table->getIdentifier('user'),
                                'value' =>  $user->getId()
                            );

        $cnt    =   $table->count($this->config['table'], null, null, $clause, $this->config['option']);
        if (0 < $cnt) {
            return true;
        }

        return false;
    }
}