<?php

function czqrpay_get_bank_account($db)
{
    $sql = "SELECT rowid, iban, account_number FROM ".MAIN_DB_PREFIX."bank_account";
    $resql = $db->query($sql);

    if ($resql) {
        while ($obj = $db->fetch_object($resql)) {
            if (!empty($obj->account_number)) return $obj->account_number;
            if (!empty($obj->iban)) return czqrpay_iban_to_cz($obj->iban);
        }
    }
    return null;
}

function czqrpay_iban_to_cz($iban)
{
    $iban = str_replace(' ', '', $iban);
    if (substr($iban, 0, 2) !== 'CZ') return null;

    $bank = substr($iban, 4, 4);
    $prefix = ltrim(substr($iban, 8, 6), '0');
    $account = ltrim(substr($iban, 14, 10), '0');

    if ($prefix) return "$prefix-$account/$bank";
    return "$account/$bank";
}

function czqrpay_build_spd($account, $amount, $vs, $msg)
{
    $amount = number_format($amount, 2, '.', '');
    return "SPD*1.0*ACC:$account*AM:$amount*CC:CZK*X-VS:$vs*MSG:$msg";
}