Magento Core discount - magento

Question

I've been struggling with this for a while, should be pretty straight forward but...
I'm trying to apply coupon to order using magento cart.coupon.add api.
The product is Virtual
here is my code ( and I've tried everything i could find on google before I came here ):
protected function _applyCoupon($quoteId, $couponCode, $store = null)
{
$coupon = Mage::getModel('salesrule/coupon');
$coupon->loadByCode($couponCode);
Mage::log('_applyCoupon('.$couponCode.')');
$quote = $this->_getQuote($quoteId, $store);
if (!$quote->getItemsCount()) {
// $this->_fault('quote_is_empty');
}
$oldCouponCode = $quote->getCouponCode();
if (!strlen($couponCode) && !strlen($oldCouponCode)) {
return false;
}
try {
//$quote->getShippingAddress()->setCollectShippingRates(true);
$quote->setCouponCode($couponCode);
$quote->setTotalsCollectedFlag(false)->collectTotals();
$quote->collectTotals();
$quote->save();
Mage::getModel("checkout/session")->setData("coupon_code",$couponCode);
Mage::getModel('checkout/cart')->getQuote()->setCouponCode($couponCode)->save();
Mage::getModel('checkout/cart')->getQuote()->collectTotals();
Mage::getModel('checkout/cart')->getQuote()->save();
Mage::log("_applyCoupon : Set coupon to quote:".$quote->getCouponCode());
} catch (Exception $e) {
$this->_fault("cannot_apply_coupon_code", $e->getMessage());
}
Mage::log('3');
if ($couponCode) {
Mage::log("Coupon applied");
if (!$couponCode == $quote->getCouponCode()) {
Mage::log('3.2');
$this->_fault('coupon_code_is_not_valid');
}
}
return true;
}
I've also tried applying coupon to address:
protected function applyDiscountToAddress($address,$quote)
{
Mage::log('applyDiscountToProduct ...');
$coupon = Mage::getModel('salesrule/coupon');
Mage::log("checkoutprocess: checkout/session:".Mage::getModel("checkout/session")->getData("coupon_code"));
$coupon->loadByCode(Mage::getModel("checkout/session")->getData("coupon_code"));
$rule = Mage::getModel('salesrule/rule');
$rule->load($coupon->getRuleId());
$discountamount = $rule->getDiscountAmount();
$dbldiscount = 0.00 + $discountamount;
$grandTotal = Mage::getModel('checkout/cart')->getQuote()->getGrandTotal();
$subTotal = Mage::getModel('checkout/cart')->getQuote()->getSubtotal();
Mage::log('applyDiscountToProduct $grandTotal:'.$grandTotal);
Mage::log('applyDiscountToProduct $subTotal:'.$subTotal);
$gTotal = $grandTotal - $dbldiscount;
$address->setDiscountAmount($dbldiscount)
->setBaseDiscountAmount($dbldiscount)
->setGrandTotal($gTotal)
->setBaseGrandTotal($gTotal);
$grandTotal = $address->getGrandTotal();
$baseGrandTotal = $address->getBaseGrandTotal();
Mage::log('applyDiscountToProduct Address:$grandTotal:'.$grandTotal);
Mage::log('applyDiscountToProduct Address:$baseGrandTotal:'.$baseGrandTotal);
$totals = array_sum($address->getAllTotalAmounts());
$baseTotals = array_sum($address->getAllBaseTotalAmounts());
$address->setGrandTotal($grandTotal+$totals);
$address->setBaseGrandTotal($baseGrandTotal+$baseTotals);
}
the coupon is valid but after the order being placed in the Magento admin I see that the discount amount = 0.0 and the user was charged full amount to his credit card.
Anyone....? Help...?

Answer 1

Finally found an answer
I needed to call setCouponCode() before adding any items to quote.
$quote= Mage::getModel('sales/quote')->setCouponCode($couponCode);