<?php

/**
 *  Informatica Eindproject D4p
 *  6in3, Stedelijk Gymnasium Nijmegen
 *  Docent: Hans de Wolf
 *
 *  ==================
 *
 *  Daniel Boutros,
 *  Christiaan Goossens,
 *  Jelmer Hinssen
 */

namespace Inforbank\Application\Helper;

class IBAN
{
    private function wordToNumbers($word)
    {
        $newword = "";
        $wordarray = str_split($word);
        foreach ($wordarray as $v) {
            if (ctype_alpha($v)) {
                $newword .= ord(strtolower($v)) - 87;
            } else {
                $newword .= $v;
            }
        }
        return $newword;
    }

    private function getCheckDigits($bignum)
    {
        //Modulo staartdeling
        $modulo97 = (int)substr($bignum, 0, 6);
        $modulo97 = $modulo97 % 97;
        $modulo97 = (1000000 * $modulo97) + (int)substr($bignum, 6, 6);
        $modulo97 = $modulo97 % 97;
        $modulo97 = (1000000 * $modulo97) + (int)substr($bignum, 12, 6);
        $modulo97 = $modulo97 % 97;
        $modulo97 = (1000000 * $modulo97) + (int)substr($bignum, 18, 6);
        $modulo97 = $modulo97 % 97;
        $checkdigits = 98 - $modulo97;
        if (strlen($checkdigits) < 2) {
            $checkdigits = '0' . $checkdigits;
        }
        return $checkdigits;
    }

    public function isValidIBAN($iban)
    {
        $iban = str_replace(" ", "", $iban);
        $landcode = substr($iban, 0, 2);
        $controle = substr($iban, 2, 2);
        $identificatie = substr($iban, 4);
        $identificatie .= $landcode;
        $identificatie .= "00";
        $nummer = $this->wordToNumbers($identificatie);
        return $controle == $this->getCheckDigits($nummer);
    }

    public function getRekeningNummer($iban)
    {
        return substr(str_replace(" ", "", $iban), 8);
    }

    public function getBank($iban)
    {
        return substr(str_replace(" ", "", $iban), 4, 4);
    }

    public function getLand($iban)
    {
        return substr(str_replace(" ", "", $iban), 0, 2);
    }

    public function getIBAN($rekeningnr)
    {
        $landcode = "NL"; // NL in vertaling
        $landnumber = $this->wordToNumbers($landcode);


        $bankcode = "INFO";
        $banknumber = $this->wordToNumbers($bankcode);

        $rekeningnr = str_pad($rekeningnr, 10, 0, STR_PAD_LEFT);

        $bignum = $banknumber . $rekeningnr . $landnumber . "00";
        $checkdigits = $this->getCheckDigits($bignum);

        $rekeningnrarr = str_split($rekeningnr, 4);
        return $landcode.$checkdigits." ".$bankcode." ".$rekeningnrarr[0]." ".$rekeningnrarr[1]." ".$rekeningnrarr[2];
    }
}