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

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

/**
 * Populate form element's values from Dictionary
 * 
 * Use dictionary lists to fill values
 *
 * @version 0.1.0
 * @package WB
 * @subpackage db
 */
class WBDatasource_FormAttribute_Dictionary extends WBDatasource_FormAttribute
{
    /**
     * configuration parameter
     *
     * - dict: name of dictionary
     * - map: map data to option attributes:
     *     map => array(
     *          'class' =>  array('format' => '%s (%s)', 'column' => array('foo', 'bar'))
     *      )
     * @var array
     */
    protected $config   =   array(
                                'dict'  =>  'Country',
                                'map'   =>  array()
                            );
    
    /**
     * dictionary
     * @var WBDictionary
     */
    protected $dict;

    /**
     * get attribute's value
     * 
     * Use dicktionary to fetch list of values
     * 
     * @param mixed $current actual attribute value
     * @return array 
     */
    protected function getAttributeValue($current)
    {
        if (!is_array($current)) {
            $current =   array();
        }
                
        $this->dict =   WBClass::create('WBDictionary_' . $this->config['dict']);
        try {
            $list =   $this->dict->getExtendedList();
        } catch(WBException_Call $e) {
            return $current;
        }

        if (empty($list)) {
            return $current;
        }

        // append list        
        foreach ($list as $l) {
            $tmp    =   array(
                                'value' => $l['id'],
                                'label' => $l['word'],
                        );

            $this->applyMap($l, $tmp);
            $current[]  =   $tmp;
        }
        return $current;
    }

    private function applyMap($data, &$target)
    {
        if (empty($this->config['map'])) {
            return;
        }

        foreach ($this->config['map'] as $att => $config) {
            if (is_scalar($config)) {
                $config =   array(
                                'format'    =>  '%s',
                                'column'    =>  array($config)
                                );
            }

            $col    =   array();
            foreach ($config['column'] as $c) {
                if (empty($c)) {
                    continue;
                }
                if (empty($data[$c])) {
                    $col[]  =   '';
                    continue;
                }
                $col[]  =   $data[$c];
            }

            if (empty($col)) {
                continue;
            }
            $target[$att]   =   vsprintf($config['format'], $col);
        }
    }
}