/**
* Calculate first payment for upgraded/downgraded subscription
* calculated move from $item -> $to billling plan
* @return Invoice
*/
function createUpgradeInvoice(Invoice $exInvoice, InvoiceItem $item)
{
$row = array('user_id' => $exInvoice->user_id, 'paysys_id' => $exInvoice->paysys_id, 'currency' => $exInvoice->currency, 'tax_type' => $exInvoice->tax_rate, 'tax_rate' => $exInvoice->tax_type, 'tax_title' => $exInvoice->tax_title, 'is_confirmed' => 1);
$invoice = $this->getDi()->invoiceTable->createRecord($row);
$to = $this->getToPlan();
if (!$to) {
throw new Am_Exception_Configuration("Upgrade: cannot load [to] plan {$this->to_billing_plan_id}");
}
$pr = $to->getProduct();
if (!$pr) {
throw new Am_Exception_Configuration("Upgrade: cannot load [to] product {$to->product_id}");
}
$invoice->add($pr, $item->qty);
$newItem = $invoice->getItem(0);
/* @var $newItem InvoiceItem */
$invoice->data()->set(Invoice::UPGRADE_INVOICE_ID, $exInvoice->pk());
$invoice->data()->set(Invoice::UPGRADE_INVOICE_ITEM_ID, $item->pk());
$invoice->calculate();
// now calculate discounts and surcharges
$unusedAmount = $this->getUnusedAmount($exInvoice, $item);
$newItem->data()->set('orig_first_price', null);
if ($this->type == self::TYPE_FLAT) {
$newItem->first_price = $this->surcharge;
} else {
$unusedAmount = $this->getUnusedAmount($exInvoice, $item);
// magic upgrade formula!
$newItem->first_price = moneyRound($newItem->first_price - $unusedAmount + $this->surcharge);
}
if ($newItem->first_price < 0) {
$invoice->data()->set(Invoice::UPGRADE_REFUND, moneyRound($unusedAmount + $newItem->first_price));
$newItem->first_price = 0.0;
}
$invoice->calculate();
$this->getDi()->hook->call(Am_Event::BEFORE_PRODUCT_UPGRADE, array('invoice' => $invoice, 'exItem' => $item, 'exInvoice' => $exInvoice, 'upgrade' => $this));
return $invoice;
}
