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<?php
namespace Ipolh\SDEK\Core\Tools;
use Ipolh\SDEK\Core\Entity\Money;
use Ipolh\SDEK\Core\Order\ItemCollection;
use Ipolh\SDEK\Core\Tools\DiscountParser\MirrorLine;
class DiscountParser
{
/**
* @var string - 'RUB' | 'USD' etc
*/
private $currency;
/**
* @var Money
*/
private $remainingOrderDiscount;
/**
* @var MirrorLine[]
*/
private $arMirror;
/**
* @var Money
*/
private $orderPrice;
/**
* DiscountParser constructor.
* @param Money $orderDiscount
* @param ItemCollection $coreItemCollection
*/
public function __construct(Money $orderDiscount, ItemCollection $coreItemCollection)
{
if ($orderDiscount->getAmount() && $coreItemCollection->getQuantity()) {
$this->remainingOrderDiscount = $orderDiscount;
$this->currency = $coreItemCollection->getFirst()->getPrice()->getCurrency();
$this->orderPrice = new Money(0, $this->currency);
$this->arMirror = array();
$this->prepareMirror($coreItemCollection);
if ($this->orderPrice->getAmount() < $this->remainingOrderDiscount->getAmount()) {
$this->remainingOrderDiscount = $this->orderPrice;
}
}
}
/**
* @param ItemCollection $coreItemCollection
*/
protected function prepareMirror(ItemCollection $coreItemCollection)
{
$coreItemCollection->reset();
while ($elem = $coreItemCollection->getNext()) {
$orderLinePrice = Money::multiply($elem->getPrice(), $elem->getQuantity());
$this->arMirror[] = new MirrorLine($elem, $orderLinePrice->getAmount(), $this->currency);
$this->orderPrice->add(array($orderLinePrice));
}
$coreItemCollection->reset();
usort(
$this->arMirror,
function (MirrorLine $a, MirrorLine $b) {
return $a->orderLinePrice - $b->orderLinePrice;
}
);
}
/**
* Method will divide order discount and decrease prices of items in order
*/
public function parseDiscountToProducts()
{
if (!$this->remainingOrderDiscount) {
return;
}
$discountPercent = $this->remainingOrderDiscount->getAmount() / $this->orderPrice->getAmount();
foreach ($this->arMirror as $line) {
$line->computeDiscountForLine($discountPercent, $this->remainingOrderDiscount);
if ($this->remainingOrderDiscount->getAmount() <= 0) {
break;
}
}
$this->lastRoundSequence();
$this->lastRoundSequence(false);
$this->applyLineDiscountsToItems();
}
protected function lastRoundSequence($skipMultipleItemLine = true)
{
foreach ($this->arMirror as $line) {
if ($this->remainingOrderDiscount->getAmount() <= 0) {
return;
}
$line->parseForLastSequence($this->remainingOrderDiscount, $skipMultipleItemLine);
}
}
protected function applyLineDiscountsToItems()
{
foreach ($this->arMirror as $line) {
$line->itemLink->getPrice()->sub(array($line->discount));
}
}
}