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<?php
namespace Bitrix\Sale\Tax;
use Bitrix\Sale\PriceMaths;
/**
* Calculating vat value.
*
* Example:
* ```php
* $calculator = new VatCalculator($rate, $isVatInPrice, $quantity);
* $vatAmout = $calculator->calc($price, $isVatInPrice, $quantity);
* ```
*/
class VatCalculator
{
private float $rate;
/**
* @param float $rate number from 0 to 1 (20% its 0.2).
* @param bool $isVatInPrice
*/
public function __construct(float $rate)
{
$this->rate = $rate;
}
/**
* Calculate vat value.
*
* @param float $price
* @param bool $withRound
*
* @return float
*/
public function calc(float $price, bool $isVatInPrice, bool $withRound = true): float
{
if ($this->rate === 0.0)
{
return 0.0;
}
elseif ($isVatInPrice)
{
$vat = $price * $this->rate / ($this->rate + 1);
}
else
{
$vat = $price * $this->rate;
}
return $withRound ? PriceMaths::roundPrecision($vat) : $vat;
}
/**
* Allocate price without vat from price with vat.
*
* @param float $price
* @param bool $withRound
*
* @return float price without vat.
*/
public function allocate(float $price, bool $withRound = true): float
{
if ($this->rate === 0.0)
{
return $price;
}
$rate = $this->rate * 100;
$vat = $price * $rate / ($rate + 100);
$priceWithoutVat = $price - $vat;
return $withRound ? PriceMaths::roundPrecision($priceWithoutVat) : $priceWithoutVat;
}
/**
* Accrue vat value to price.
*
* @param float $price
* @param bool $withRound
*
* @return float price with vat.
*/
public function accrue(float $price, bool $withRound = true): float
{
$priceWithVat = $price * (1 + $this->rate);
return $withRound ? PriceMaths::roundPrecision($priceWithVat) : $priceWithVat;
}
}