/**
* Calculate unit tax anount based on unit price
*
* @param Mage_Sales_Model_Quote_Item_Abstract $item
* @param float $rate
* @return Mage_Tax_Model_Sales_Total_Quote
*/
protected function _calcUnitTaxAmount(Mage_Sales_Model_Quote_Item_Abstract $item, $rate)
{
$extra = $item->getExtraTaxableAmount();
$baseExtra = $item->getBaseExtraTaxableAmount();
$qty = $item->getTotalQty();
$inclTax = $item->getIsPriceInclTax();
$price = $item->getTaxableAmount();
$basePrice = $item->getBaseTaxableAmount();
$item->setTaxPercent($rate);
$hiddenTax = null;
$baseHiddenTax = null;
switch ($this->_config->getCalculationSequence($this->_store)) {
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_EXCL:
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_INCL:
$unitTax = $this->_calculator->calcTaxAmount($price, $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice, $rate, $inclTax);
break;
break;
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_EXCL:
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_INCL:
$discountAmount = $item->getDiscountAmount() / $qty;
$baseDiscountAmount = $item->getBaseDiscountAmount() / $qty;
$unitTax = $this->_calculator->calcTaxAmount(max($price - $discountAmount, 0), $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount(max($basePrice - $baseDiscountAmount, 0), $rate, $inclTax);
if ($inclTax && $discountAmount > 0) {
$hiddenTax = $price - $unitTax - $item->getConvertedPrice();
$baseHiddenTax = $basePrice - $unitTax - $item->getBasePrice();
} elseif ($discountAmount > $price) {
// case with 100% discount on price incl. tax
$hiddenTax = $discountAmount - $price;
$baseHiddenTax = $baseDiscountAmount - $basePrice;
}
break;
}
$item->setTaxAmount($this->_store->roundPrice(max(0, $qty * $unitTax)));
$item->setBaseTaxAmount($this->_store->roundPrice(max(0, $qty * $baseUnitTax)));
$item->setHiddenTaxAmount(max(0, $qty * $hiddenTax));
$item->setBaseHiddenTaxAmount(max(0, $qty * $baseHiddenTax));
return $this;
}
/**
* Calculate unit tax anount based on unit price
*
* @param Mage_Sales_Model_Quote_Item_Abstract $item
* @param float $rate
* @return Mage_Tax_Model_Sales_Total_Quote
*/
protected function _calcUnitTaxAmount(Mage_Sales_Model_Quote_Item_Abstract $item, $rate)
{
$qty = $item->getTotalQty();
$inclTax = $item->getIsPriceInclTax();
$price = $item->getTaxableAmount() + $item->getExtraTaxableAmount();
$basePrice = $item->getBaseTaxableAmount() + $item->getBaseExtraTaxableAmount();
$rateKey = (string) $rate;
$item->setTaxPercent($rate);
$hiddenTax = null;
$baseHiddenTax = null;
switch ($this->_config->getCalculationSequence($this->_store)) {
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_EXCL:
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_INCL:
$unitTax = $this->_calculator->calcTaxAmount($price, $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice, $rate, $inclTax);
break;
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_EXCL:
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_INCL:
$discountAmount = $item->getDiscountAmount() / $qty;
$baseDiscountAmount = $item->getBaseDiscountAmount() / $qty;
$unitTax = $this->_calculator->calcTaxAmount($price, $rate, $inclTax);
$discountRate = $unitTax / $price * 100;
$unitTaxDiscount = $this->_calculator->calcTaxAmount($discountAmount, $discountRate, $inclTax, false);
$unitTax = max($unitTax - $unitTaxDiscount, 0);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice, $rate, $inclTax);
$baseDiscountRate = $baseUnitTax / $basePrice * 100;
$baseUnitTaxDiscount = $this->_calculator->calcTaxAmount($baseDiscountAmount, $baseDiscountRate, $inclTax, false);
$baseUnitTax = max($baseUnitTax - $baseUnitTaxDiscount, 0);
if ($inclTax && $discountAmount > 0) {
$hiddenTax = $this->_calculator->calcTaxAmount($discountAmount, $rate, $inclTax, false);
$baseHiddenTax = $this->_calculator->calcTaxAmount($baseDiscountAmount, $rate, $inclTax, false);
$this->_hiddenTaxes[] = array('rate_key' => $rateKey, 'qty' => $qty, 'item' => $item, 'value' => $hiddenTax, 'base_value' => $baseHiddenTax, 'incl_tax' => $inclTax);
} elseif ($discountAmount > $price) {
// case with 100% discount on price incl. tax
$hiddenTax = $discountAmount - $price;
$baseHiddenTax = $baseDiscountAmount - $basePrice;
$this->_hiddenTaxes[] = array('rate_key' => $rateKey, 'qty' => $qty, 'item' => $item, 'value' => $hiddenTax, 'base_value' => $baseHiddenTax, 'incl_tax' => $inclTax);
}
break;
}
$item->setTaxAmount($this->_store->roundPrice(max(0, $qty * $unitTax)));
$item->setBaseTaxAmount($this->_store->roundPrice(max(0, $qty * $baseUnitTax)));
return $this;
}
/**
* Calculate unit tax anount based on unit price
*
* @param Mage_Sales_Model_Quote_Item_Abstract $item
* @param float $rate
* @return Mage_Tax_Model_Sales_Total_Quote
*/
protected function _calcUnitTaxAmount(Mage_Sales_Model_Quote_Item_Abstract $item, $rate)
{
$store = $item->getStore();
$inclTax = $this->_usePriceIncludeTax($store);
$extra = $item->getExtraTaxableAmount();
$baseExtra = $item->getBaseExtraTaxableAmount();
if ($inclTax) {
$price = $store->roundPrice($item->getTaxCalcPrice()) + $extra;
$basePrice = $store->roundPrice($item->getBaseTaxCalcPrice()) + $baseExtra;
} else {
if ($item->hasCustomPrice() && $this->_helper->applyTaxOnCustomPrice($store)) {
$price = $store->roundPrice($item->getCalculationPrice()) + $extra;
$basePrice = $store->roundPrice($item->getBaseCalculationPrice()) + $baseExtra;
} else {
$price = $store->roundPrice($item->getOriginalPrice()) + $item->getExtraTaxableAmount();
$basePrice = $store->roundPrice($item->getBaseOriginalPrice()) + $item->getBaseExtraTaxableAmount();
}
}
$discountAmount = $item->getDiscountAmount();
$baseDiscountAmount = $item->getBaseDiscountAmount();
$qty = $item->getTotalQty();
$item->setTaxPercent($rate);
$rate = $rate / 100;
$calculationSequence = $this->_config->getCalculationSequence($store);
switch ($calculationSequence) {
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_EXCL:
$unitTax = $this->_calculator->calcTaxAmount($price, $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice, $rate, $inclTax);
break;
case Mage_Tax_Model_Calculation::CALC_TAX_BEFORE_DISCOUNT_ON_INCL:
$unitTax = $this->_calculator->calcTaxAmount($price, $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice, $rate, $inclTax);
if ($inclTax) {
$item->setDiscountCalculationPrice($price);
$item->setBaseDiscountCalculationPrice($basePrice);
} else {
$item->setDiscountCalculationPrice($price + $unitTax);
$item->setBaseDiscountCalculationPrice($basePrice + $baseUnitTax);
}
break;
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_EXCL:
case Mage_Tax_Model_Calculation::CALC_TAX_AFTER_DISCOUNT_ON_INCL:
$unitTax = $this->_calculator->calcTaxAmount($price - $discountAmount / $qty, $rate, $inclTax);
$baseUnitTax = $this->_calculator->calcTaxAmount($basePrice - $baseDiscountAmount / $qty, $rate, $inclTax);
break;
}
$totalTax = $store->roundPrice($qty * $unitTax);
$totalBaseTax = $store->roundPrice($qty * $baseUnitTax);
/**
* Renew item amounts in case if we are working with price include tax
*/
if ($inclTax) {
if ($item->hasCustomPrice()) {
$item->setCustomPrice($item->getPriceInclTax() - $unitTax);
$item->setBaseCustomPrice($item->getBasePriceInclTax() - $baseUnitTax);
} else {
$item->setOriginalPrice($item->getPriceInclTax() - $unitTax);
$item->setPrice($item->getBasePriceInclTax() - $baseUnitTax);
$item->setBasePrice($item->getBasePriceInclTax() - $baseUnitTax);
}
$item->setRowTotal($item->getRowTotalInclTax() - $totalTax);
$item->setBaseRowTotal($item->getBaseRowTotalInclTax() - $totalBaseTax);
}
$item->setTaxAmount($totalTax);
$item->setBaseTaxAmount($totalBaseTax);
return $this;
}
