/**
* Distribute discount at parent item to children items
*
* @param \Magento\Quote\Model\Quote\Item\AbstractItem $item
* @return $this
*/
protected function distributeDiscount(\Magento\Quote\Model\Quote\Item\AbstractItem $item)
{
$parentBaseRowTotal = $item->getBaseRowTotal();
$keys = ['discount_amount', 'base_discount_amount', 'original_discount_amount', 'base_original_discount_amount'];
$roundingDelta = [];
foreach ($keys as $key) {
//Initialize the rounding delta to a tiny number to avoid floating point precision problem
$roundingDelta[$key] = 1.0E-7;
}
foreach ($item->getChildren() as $child) {
$ratio = $child->getBaseRowTotal() / $parentBaseRowTotal;
foreach ($keys as $key) {
if (!$item->hasData($key)) {
continue;
}
$value = $item->getData($key) * $ratio;
$roundedValue = $this->priceCurrency->round($value + $roundingDelta[$key]);
$roundingDelta[$key] += $value - $roundedValue;
$child->setData($key, $roundedValue);
}
}
foreach ($keys as $key) {
$item->setData($key, 0);
}
return $this;
}
