/**
* Calculates new amount for attribute
*
* @param VariantInterface $variant
* @param $amount
*
* @return float
*/
protected function calculateAttributePrice(VariantInterface $variant, $amount)
{
$modifierType = $variant->getModifierType();
$modifierValue = $variant->getModifierValue();
switch ($modifierType) {
case '+':
$amount = $amount + $modifierValue;
break;
case '-':
$amount = $amount - $modifierValue;
break;
case '%':
$amount = $amount * ($modifierValue / 100);
break;
}
return round($amount, 2);
}