/**
* Calculate totals from invoice items
* @param Model $items
* @return float
*/
public function calculateTotals($items = null)
{
if (!$items) {
$items = $this->items;
}
/*
* Discount and subtotal
*/
$discount = 0;
$subtotal = 0;
foreach ($items as $item) {
$subtotal += $item->subtotal;
$discount += $item->discount;
}
/*
* Calculate tax
*/
$taxInfo = Tax::calculateTaxes($items, $this->getLocationInfo());
$this->setSalesTaxes($taxInfo->taxes);
$tax = $taxInfo->tax_total;
/*
* Grand total
*/
$this->discount = $discount;
$this->subtotal = $subtotal;
$this->tax = $tax;
$this->total = $subtotal - $discount + $tax;
return $this->total;
}
