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

WBClass::load('WBDatasource_FormAttribute');

/**
 * Populate form element's values from any table
 *
 * Use table data to populate values
 *
 * @version 0.3.0
 * @package WB
 * @subpackage db
 */
class WBDatasource_FormAttribute_Tree extends WBDatasource_FormAttribute
{
    /**
     * configuration parameter
     * @var array
     */
    protected $config   =   array(
                                'table'         =>  'vfsdir',
                                'labelcolumns'  =>  array('name'),
                                'labelformat'   =>  ' %s',
                                'levelclass'    =>  'level level%d',
                                'branch'        =>  '',
                                'maxdepth'      =>  -1,
                                'clause'        =>  array()
                            );

    /**
     * table
     * @var WBDatasource_Tree
     */
    protected $tree;

    /**
     * current item
     * @var array
     */
    protected $list =   array();

    /**
     * get attribute's value
     *
     * Use dicktionary to fetch list of values
     *
     * @param mixed $current actual attribute value
     * @return array
     */
    protected function getAttributeValue($current)
    {
        $params =   array(
                        'treetable'     =>  $this->config['table']
                    );

        if (!is_array($this->config['clause'])) {
            $this->config['clause'] =   array();
        }

        $this->tree     =   WBClass::create('WBDatasource_Tree', $params);
        if (!is_array($current)) {
            $current =   array();
        }

        if (!empty($this->config['clause']) && is_array($this->config['clause'])) {
            $this->tree->setClause($this->config['clause']);
        }

        $this->list =   $current;
        $this->dig($this->config['branch'], 0);
        return $this->list;
    }

    /**
     * Dig up children
     *
     * @param string $branch id
     * @param int current level
     */
    private function dig($branch, $level)
    {
        if (0 < $this->config['maxdepth'] && $level >= $this->config['maxdepth']) {
            return;
        }
        $list       =   $this->tree->getChildren($branch);
        $primary    =   $this->tree->getIdentifier();
        foreach ($list as $v => $l) {
            $cols       =   array();
            foreach ($this->config['labelcolumns'] as $lc) {
                $cols[] =   $l[$lc];
            }
            $this->list[]  =   array(
                                'value' =>  $l[$primary],
                                'label' =>  vsprintf($this->config['labelformat'], $cols),
                                'class' =>  sprintf($this->config['levelclass'], $level)
                        );

            // dig deeper
            $this->dig($l[$primary], ($level + 1));
        }
    }
}