if ($discountAmount >= 0) {
                $total = $quote->getBaseSubtotal();
                $quote->setSubtotal(0);
                $quote->setBaseSubtotal(0);

                $quote->setSubtotalWithDiscount(0);
                $quote->setBaseSubtotalWithDiscount(0);

                $quote->setGrandTotal(0);
                $quote->setBaseGrandTotal(0);

                $canAddItems = $quote->isVirtual() ? ('billing') : ('shipping');
                foreach ($quote->getAllAddresses() as $address) {

                    $address->setSubtotal($priceTotal);
                    $address->setBaseSubtotal($priceTotal);

                    $address->setGrandTotal($priceTotal - $discountAmount + $taxTotal);
                    $address->setBaseGrandTotal($priceTotal - $discountAmount + $taxTotal);

                    // $address->collectTotals();

                    $quote->setSubtotal($priceTotal);
                    $quote->setBaseSubtotal($priceTotal);

                    $quote->setSubtotalWithDiscount(
                        ($priceTotal - $discountAmount)
                    );
                    $quote->setBaseSubtotalWithDiscount(
                        ($priceTotal - $discountAmount)
                    );

                    $quote->setGrandTotal($priceTotal - $discountAmount + $taxTotal);
                    $quote->setBaseGrandTotal($priceTotal - $discountAmount + $taxTotal);

                    $quote->save();

                    $quote->setGrandTotal($priceTotal - $discountAmount + $taxTotal)
                        ->setBaseGrandTotal($priceTotal - $discountAmount + $taxTotal)
                        ->setSubtotalWithDiscount($priceTotal - $discountAmount)
                        ->setBaseSubtotalWithDiscount($priceTotal - $discountAmount)
                        ->save();

                    if ($address->getAddressType() == $canAddItems) {
                        $address->setSubtotalWithDiscount($priceTotal - $discountAmount + $taxTotal);
                        $address->setGrandTotal($priceTotal - $discountAmount + $taxTotal);
                        $address->setBaseSubtotalWithDiscount($priceTotal - $discountAmount + $taxTotal);
                        $address->setBaseGrandTotal($priceTotal - $discountAmount + $taxTotal);

                        $address->setTaxAmount($taxTotal);
                        $address->setBaseTaxAmount($taxTotal);

                        if ($address->getDiscountDescription()) {
                            $address->setDiscountAmount(-($discountAmount));
                            // $address->setDiscountDescription($address->getDiscountDescription() . ', Gift Sets');
                            $address->setBaseDiscountAmount(-($discountAmount));
                        } else {
                            $address->setDiscountAmount(-($discountAmount));
                            // $address->setDiscountDescription('');
                            $address->setBaseDiscountAmount(-($discountAmount));
                        }
                        $address->save();
                    }
                }

                foreach ($quote->getAllItems() as $item) {
                    $item->setDiscountAmount(0);
                    $item->setBaseDiscountAmount(0)->save();
                }
            }