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<?php | |
class DiscountApplier | |
{ | |
private DiscountCalculator $calculator; | |
public function __construct(DiscountCalculator $calculator) | |
{ | |
$this->calculator = $calculator; | |
} | |
public function apply(Basket $basket): void | |
{ | |
if (!$basket->hasItems()) { | |
return; | |
} | |
$discount = 0.0; | |
foreach ($this->getDiscountableItems($basket) as $basketItem) { | |
$discount += $this->calculator->getDiscount($basketItem); | |
} | |
$basket->applyDiscount($discount); | |
} | |
/** | |
* @return iterable<BasketItem> | |
*/ | |
private function getDiscountableItems(Basket $basket): iterable | |
{ | |
foreach ($basket->getItems() as $basketItem) { | |
if (!$basketItem->isTaxable() || $basketItem->getPrice() === 0) { | |
continue; | |
} | |
yield $basketItem; | |
} | |
} | |
} |
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