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<?php
namespace StripeIntegration\Tax\Helper;
class TaxCalculator
{
private $currencyHelper;
public function __construct(
Currency $currencyHelper
)
{
$this->currencyHelper = $currencyHelper;
}
public function getFormattedStripeCalculatedValues($tax, $amount, $currency)
{
return [
'stripe_tax' => $tax,
'stripe_amount' => $amount,
'currency' => $currency
];
}
public function calculateStripeValuesInBaseCurrency($item, $currentCurrency, $baseCurrencyCode)
{
$rate = $currentCurrency->getAnyRate($baseCurrencyCode);
$stripeTotalCalculatedTax = round($item->getStripeTotalCalculatedTax() * $rate);
$stripeTotalCalculatedAmount = round($item->getStripeTotalCalculatedAmount() * $rate);
return $this->getFormattedStripeCalculatedValues($stripeTotalCalculatedTax, $stripeTotalCalculatedAmount, $baseCurrencyCode);
}
/**
* @param $item
* @param $baseToOrderRate
* @param $baseCurrency
* @return array
*
* Returns the calculated values based on the base-to-order rate saved on the order.
* Added this because currency rates are changed frequently, and we need to have the values on the order instead
* of current values which might differ.
*/
public function calculateStripeValuesInBaseCurrencyForInvoice($item, $baseToOrderRate, $baseCurrencyCode)
{
// Because we get the base-to-order rate and because we need the order-to-base rate we will invert it.
$rate = round(1 / $baseToOrderRate, 4);
$stripeTotalCalculatedTax = round($item->getStripeTotalCalculatedTax() * $rate);
$stripeTotalCalculatedAmount = round($item->getStripeTotalCalculatedAmount() * $rate);
return $this->getFormattedStripeCalculatedValues($stripeTotalCalculatedTax, $stripeTotalCalculatedAmount, $baseCurrencyCode);
}
public function getStripeCalculatedValues($item, $currentCurrency, $baseCurrencyCode)
{
if ($item->getUseBaseCurrency()) {
return $this->calculateStripeValuesInBaseCurrency($item, $currentCurrency, $baseCurrencyCode);
} else {
return $this->getFormattedStripeCalculatedValues(
$item->getStripeTotalCalculatedTax(),
$item->getStripeTotalCalculatedAmount(),
$item->getStripeCurrency()
);
}
}
public function getStripeCalculatedValuesForInvoice($item, $baseToOrderRate, $baseCurrencyCode)
{
if ($item->getUseBaseCurrency()) {
return $this->calculateStripeValuesInBaseCurrencyForInvoice($item, $baseToOrderRate, $baseCurrencyCode);
} else {
return $this->getFormattedStripeCalculatedValues(
$item->getStripeTotalCalculatedTax(),
$item->getStripeTotalCalculatedAmount(),
$item->getStripeCurrency()
);
}
}
public function calculatePrices($item, $calculatedValues, $quantity)
{
if ($item->getPriceIncludesTax()) {
return $this->getTaxInclusiveCalculation($item, $calculatedValues, $quantity);
} else {
return $this->getTaxExclusiveCalculation($item, $calculatedValues, $quantity);
}
}
private function getTaxInclusiveCalculation($item, $calculatedValues, $quantity)
{
$unitPrice = $this->currencyHelper->magentoAmountToStripeAmount($item->getUnitPrice(), $calculatedValues['currency']);
$discountAmount = $this->currencyHelper->magentoAmountToStripeAmount($item->getDiscountAmount(), $calculatedValues['currency']);
if (!$discountAmount) {
return $this->getTaxInclusivePrices($calculatedValues, $quantity);
} else {
return $this->getTaxInclusivePricesWithDiscount($calculatedValues, $quantity, $unitPrice);
}
}
private function getTaxExclusiveCalculation($item, $calculatedValues, $quantity)
{
$unitPrice = $this->currencyHelper->magentoAmountToStripeAmount($item->getUnitPrice(), $calculatedValues['currency']);
$discountAmount = $this->currencyHelper->magentoAmountToStripeAmount($item->getDiscountAmount(), $calculatedValues['currency']);
if (!$discountAmount) {
return $this->getTaxExclusivePrices($calculatedValues, $quantity);
} else {
return $this->getTaxExclusivePricesWithDiscount($calculatedValues, $quantity, $unitPrice);
}
}
public function getTaxInclusivePrices($calculatedValues, $quantity)
{
$rowTax = $calculatedValues['stripe_tax'];
$rowTotal = $calculatedValues['stripe_amount'] - $rowTax;
$price = round(($rowTotal) / $quantity);
$tax = round($rowTax / $quantity);
$priceInclTax = round($calculatedValues['stripe_amount'] / $quantity);
$rowTotalInclTax = $calculatedValues['stripe_amount'];
$discountTaxCompensation = 0;
return $this->getFormattedPrices(
$rowTax, $rowTotal, $price, $tax, $priceInclTax, $rowTotalInclTax, $discountTaxCompensation, $calculatedValues['currency']
);
}
public function getTaxInclusivePricesWithDiscount($calculatedValues, $quantity, $unitPrice)
{
// for discounts, Magento mainly sets values which contain the full price, so we will use the unit price
// provided by Magento for these calculations
$priceInclTax = $unitPrice;
$rowTotalInclTax = $unitPrice * $quantity;
$rowTaxAfterDiscount = $calculatedValues['stripe_tax'];
$rowTax = $this->calculateWithRuleOfThree($calculatedValues['stripe_amount'], $rowTotalInclTax, $calculatedValues['stripe_tax']);
$rowTotal = $rowTotalInclTax - $rowTax;
$price = round(($rowTotal) / $quantity);
$discountTaxCompensation = $rowTax - $rowTaxAfterDiscount;
$rowTax = $rowTaxAfterDiscount;
$tax = round($rowTax / $quantity);
return $this->getFormattedPrices(
$rowTax, $rowTotal, $price, $tax, $priceInclTax, $rowTotalInclTax, $discountTaxCompensation, $calculatedValues['currency']
);
}
public function getTaxExclusivePrices($calculatedValues, $quantity)
{
$rowTax = $calculatedValues['stripe_tax'];
$rowTotal = $calculatedValues['stripe_amount'];
$price = round($rowTotal / $quantity);
$tax = round($rowTax / $quantity);
$priceInclTax = $price + $tax;
$rowTotalInclTax = $rowTotal + $rowTax;
return $this->getFormattedPrices(
$rowTax, $rowTotal, $price, $tax, $priceInclTax, $rowTotalInclTax, 0, $calculatedValues['currency']
);
}
public function getTaxExclusivePricesWithDiscount($calculatedValues, $quantity, $unitPrice)
{
// for discounts, Magento mainly sets values which contain the full price, so we will use the unit price
// provided by Magento for these calculations
$rowTax = $calculatedValues['stripe_tax'];
$rowTotal = $unitPrice * $quantity;
$price = $unitPrice;
$tax = round($rowTax / $quantity);
$rowTaxBeforeDiscount = $this->calculateWithRuleOfThree($calculatedValues['stripe_amount'], $rowTotal, $rowTax);
$taxBeforeDiscount = round($rowTaxBeforeDiscount / $quantity);
$priceInclTax = $price + $taxBeforeDiscount;
$rowTotalInclTax = $priceInclTax * $quantity;
return $this->getFormattedPrices(
$rowTax, $rowTotal, $price, $tax, $priceInclTax, $rowTotalInclTax, 0, $calculatedValues['currency']
);
}
public function getFormattedPrices($rowTax, $rowTotal, $price, $tax, $priceInclTax, $rowTotalInclTax, $discountTaxCompensation, $currency)
{
return [
'row_tax' => $this->currencyHelper->stripeAmountToMagentoAmount($rowTax, $currency),
'row_total' => $this->currencyHelper->stripeAmountToMagentoAmount($rowTotal, $currency),
'price' => $this->currencyHelper->stripeAmountToMagentoAmount($price, $currency),
'tax' => $this->currencyHelper->stripeAmountToMagentoAmount($tax, $currency),
'price_incl_tax' => $this->currencyHelper->stripeAmountToMagentoAmount($priceInclTax, $currency),
'row_total_incl_tax' => $this->currencyHelper->stripeAmountToMagentoAmount($rowTotalInclTax, $currency),
'discount_tax_compensation' => $this->currencyHelper->stripeAmountToMagentoAmount($discountTaxCompensation, $currency),
];
}
public function getZeroValuesPrices()
{
return $this->getFormattedPrices(0, 0, 0, 0, 0, 0, 0, 0);
}
/**
* If using a rule, term1 corresponds to term2 and term3 corresponds to x, then x = term2 * term3 / term1.
*
* Added the method for the case where there are discounts, and we know the discounted price, the discounted price
* tax and the normal price. In order to not perform another API call, we would deduce the tax for the normal price
* based on the existing 3 values. This in turn will help to get the discount tax compensation.
*/
private function calculateWithRuleOfThree($term1, $term2, $term3)
{
if ($term1 == 0) {
return 0;
}
return round($term2 * $term3 / $term1);
}
}