<?php
/**
 * Key-Value-Pair List Merger: Ordered
 *
 * $Id$
 *
 * @package patTemplate
 * @package Modifiers
 * @author gERD Schaufelberger <gerd@php-tools.net>
 */

WBClass::load('WBDatasource_KeyValuePair_ListMerger');

/**
 * Key-Value-Pair List Merger: Ordered
 *
 * Merǵing strategy
 *
 * @package patTemplate
 * @package Modifiers
 * @author gERD Schaufelberger <gerd@php-tools.net>
 */
class WBDatasource_KeyValuePair_ListMerger_Leading extends WBDatasource_KeyValuePair_ListMerger
{
    /**
     * Get List
     *
     * @param string|array $id
     * @param array $params
     * @return array
     */
    public function get($id, $params = array())
    {
        if (!is_array($id)) {
            $id =   array($id);
        }
        $list   =   $this->kvp->get($id, true);

        // simple list without merging
        if (empty($params['parent']) || in_array($params['parent'], $id)) {
            foreach ($list as $j => &$l) {
                $l['parentvalue']   =   '';
                $l['class']         =   '';
            }
            return $list;
        }

        // remove duplicates
        $pList  =   $this->kvp->get($params['parent'], true);
        $found  =   array();
        foreach ($pList as $pk => &$pv) {
            $pv['parentvalue']  =   '';
            $pv['class']        =   '';

            foreach ($list as $lk => &$lv) {
                if ($lv['key'] == $pv['key']) {
                    $found[]            =   $lk;
                    $lv['parentvalue']  =   $pv['value'];
                    $lv['class']        =   'merged';
                    unset($pList[$pk]);
                    break;
                }
                if (!in_array($lk, $found)) {
                    $lv['parentvalue']  =   '';
                    $lv['class']        =   'added';
                }
            }
        }
        $pList  =   array_values($pList);
        return array_merge($list, $pList);
    }

}