<?php

namespace mt;

use phpcommon;

class Parameter {

    public static function get($id)
    {
        return array_key_exists($id, self::getMetaList()) ? self::getMetaList()[$id] : null;
    }

    public static function getOldParam($id)
    {
        $meta = self::get($id);
        return array(
            'id' => $meta['id'],
            'name' => $meta['param_name'],
            'value' => $meta['param_value'],
            'param_name' => $meta['param_name'],
            'param_value' => $meta['param_value'],
        );
    }

    public static function getByName($name)
    {
        self::mustBeNameHash();
        $meta = array_key_exists($name, self::$nameHash) ? self::$nameHash[$name] : null;
        return $meta;
    }

    public static function getVal($name, $defVal)
    {
        $meta = self::getByName($name);
        return $meta ? $meta['param_value'] : $defVal;
    }

    public static function getListValue($name, $defVal = array())
    {
        $val = self::getVal($name, null);
        if ($val == null) {
            return $defVal;
        }
        $values = explode('|', $val);
        return $values;
    }

    protected static function getMetaList()
    {
        if (!self::$metaList) {
            self::$metaList = getMetaTable('parameter@parameter.php');
        }
        return self::$metaList;
    }

    protected static function mustBeNameHash()
    {
        if (!self::$nameHash) {
            self::$nameHash = array();
            foreach (self::getMetaList() as $meta) {
                self::$nameHash[$meta['param_name']] = $meta;
            }
        }
    }

    protected static $nameHash;
    protected static $metaList;

}