public function PromotionSubscriber::onCalculate in Commerce Shipping 8.2

Applies the promotions.

Parameters

\Drupal\commerce_shipping\Event\ShippingRatesEvent $event: The event.

File

src/EventSubscriber/PromotionSubscriber.php, line 63

Class

PromotionSubscriber

Applies display-inclusive promotions to the calculated shipping rates.

Namespace

Drupal\commerce_shipping\EventSubscriber

Code

public function onCalculate(ShippingRatesEvent $event) {
  $rates = $event
    ->getRates();
  if (empty($rates)) {
    return;
  }
  $shipping_method = $event
    ->getShippingMethod();
  $shipment = $event
    ->getShipment();
  $order = $shipment
    ->getOrder();
  $promotions = $this
    ->getPromotions($order);
  if (empty($promotions)) {
    return;
  }

  // Clone the entities to avoid modifying the original data.
  $fake_shipment = clone $shipment;
  $fake_order = clone $order;
  $fake_order
    ->set('shipments', [
    $fake_shipment,
  ]);

  // Re-fetch the shipment to acquire a reference.

  /** @var \Drupal\commerce_shipping\Entity\ShipmentInterface[] $fake_shipments */
  $fake_shipments = $fake_order
    ->get('shipments')
    ->referencedEntities();
  $fake_shipment = reset($fake_shipments);

  // Calculate the discounted amounts.
  foreach ($rates as $rate) {
    $shipping_method
      ->getPlugin()
      ->selectRate($fake_shipment, $rate);
    $fake_shipment
      ->clearAdjustments();
    foreach ($promotions as $promotion) {
      if ($promotion
        ->applies($fake_order)) {
        $promotion
          ->apply($fake_order);
      }
    }
    $rate
      ->setAmount($fake_shipment
      ->getAmount());
  }
}