/** * Gets the total discount from $order * inkl. and excl. tax * Data is returned as a Varien_Object with these data-keys set: * - discount_incl_tax * - discount_excl_tax * * @param Mage_Sales_Model_Order $order * * @return Varien_Object */ public function getOrderDiscountData(Mage_Sales_Model_Order $order) { // if catalog-prices includes tax $CatPriceIncl = Mage::getStoreConfig(Mage_Tax_Model_Config::CONFIG_XML_PATH_PRICE_INCLUDES_TAX, $order->getStore()); $discountIncl = 0; $discountExcl = 0; // find discount on the items foreach ($order->getItemsCollection() as $item) { /** @var Mage_Sales_Model_Quote_Item $item */ if (!$CatPriceIncl) { $discountExcl += $item->getDiscountAmount(); $discountIncl += $item->getDiscountAmount() * ($item->getTaxPercent() / 100 + 1); } else { $discountExcl += $item->getDiscountAmount() / ($item->getTaxPercent() / 100 + 1); $discountIncl += $item->getDiscountAmount(); } } // find out tax-rate for the shipping if ((double) $order->getShippingInclTax() && (double) $order->getShippingAmount()) { $shippingTaxRate = $order->getShippingInclTax() / $order->getShippingAmount(); } else { $shippingTaxRate = 1; } // get discount amount for shipping $shippingDiscount = (double) $order->getShippingDiscountAmount(); // apply/remove tax to shipping-discount if (!$CatPriceIncl) { $discountIncl += $shippingDiscount * $shippingTaxRate; $discountExcl += $shippingDiscount; } else { $discountIncl += $shippingDiscount; $discountExcl += $shippingDiscount / $shippingTaxRate; } $return = new Varien_Object(); return $return->setDiscountInclTax($discountIncl)->setDiscountExclTax($discountExcl); }