<?php

namespace Akky\Money;

/**
 *
 *
 */
abstract class Currency
{
    protected $_callbackConvert = null;
    function __construct(/*callable - not works on PHP 5.3*/ $callbackConvert = null) {
        if (!is_null($callbackConvert)) {
            $this->_callbackConvert = $callbackConvert;
        }
    }

    abstract public function apply($text);
    abstract public function normalize($numbers);

    /**
     * replace the found price with converted information
     */
    public function processNumber($matched) {
        $normalized = $this->normalize($matched);
        $callbackConvert = $this->_callbackConvert;
        if (is_callable($callbackConvert)) {
            $addings = $callbackConvert($normalized);
        } else {
            if ($normalized === 0) {
                $addings = '';
            } else {
                $addings = '(' . $normalized . ')';
            }
        }
        return $matched[0] . $addings;
    }

}