$invoice = new invoice($id);
$items = $invoice->loadItems();
if (isset($addpayment) && is_numeric($addpayment)) {
    $invoice->addPayment($addpayment);
    Header("Location: A2B_invoice_manage_payment.php?id={$id}");
}
if (isset($delpayment) && is_numeric($delpayment)) {
    $invoice->delPayment($delpayment);
    Header("Location: A2B_invoice_manage_payment.php?id={$id}");
}
if (isset($status) && is_numeric($status)) {
    $invoice->changeStatus($status);
    Header("Location: A2B_invoice_manage_payment.php?id={$id}");
}
$smarty->display('main.tpl');
$payments = $invoice->loadPayments();
$price_without_vat = 0;
$price_with_vat = 0;
$vat_array = array();
foreach ($items as $item) {
    $price_without_vat = $price_without_vat + $item->getPrice();
    $price_with_vat = $price_with_vat + $item->getPrice() * (1 + $item->getVAT() / 100);
    if (array_key_exists("" . $item->getVAT(), $vat_array)) {
        $vat_array[$item->getVAT()] = $vat_array[$item->getVAT()] + $item->getPrice() * ($item->getVAT() / 100);
    } else {
        $vat_array[$item->getVAT()] = $item->getPrice() * ($item->getVAT() / 100);
    }
}
$payment_assigned = 0;
foreach ($payments as $payment) {
    $payment_assigned = $payment_assigned + $payment['payment'];