OrderItemFixedAmountOff.php in Commerce Core 8.2

Namespace

Drupal\commerce_promotion\Plugin\Commerce\PromotionOffer

File

modules/promotion/src/Plugin/Commerce/PromotionOffer/OrderItemFixedAmountOff.php

<?php

namespace Drupal\commerce_promotion\Plugin\Commerce\PromotionOffer;

use Drupal\commerce_order\Adjustment;
use Drupal\commerce_promotion\Entity\PromotionInterface;
use Drupal\Core\Entity\EntityInterface;

/**
 * Provides the percentage off offer for order items.
 *
 * @CommercePromotionOffer(
 *   id = "order_item_fixed_amount_off",
 *   label = @Translation("Fixed amount off each matching product"),
 *   entity_type = "commerce_order_item",
 * )
 */
class OrderItemFixedAmountOff extends OrderItemPromotionOfferBase {
  use FixedAmountOffTrait;

  /**
   * {@inheritdoc}
   */
  public function apply(EntityInterface $entity, PromotionInterface $promotion) {
    $this
      ->assertEntity($entity);

    /** @var \Drupal\commerce_order\Entity\OrderItemInterface $order_item */
    $order_item = $entity;
    $adjusted_total_price = $order_item
      ->getAdjustedTotalPrice([
      'promotion',
    ]);
    $amount = $this
      ->getAmount();
    if ($adjusted_total_price
      ->getCurrencyCode() != $amount
      ->getCurrencyCode()) {
      return;
    }
    if ($this->configuration['display_inclusive']) {

      // First, get the adjusted unit price to ensure the order item is not
      // already fully discounted.
      $adjusted_unit_price = $order_item
        ->getAdjustedUnitPrice([
        'promotion',
      ]);

      // The adjusted unit price is already reduced to 0, no need to continue
      // further.
      if ($adjusted_unit_price
        ->isZero()) {
        return;
      }

      // Display-inclusive promotions must first be applied to the unit price.
      if ($amount
        ->greaterThan($adjusted_unit_price)) {

        // Don't reduce the unit price past zero.
        $amount = $adjusted_unit_price;
      }
      $unit_price = $order_item
        ->getUnitPrice();
      $new_unit_price = $unit_price
        ->subtract($amount);
      $order_item
        ->setUnitPrice($new_unit_price);
      $adjustment_amount = $amount
        ->multiply($order_item
        ->getQuantity());
      $adjustment_amount = $this->rounder
        ->round($adjustment_amount);
    }
    else {
      $adjustment_amount = $amount
        ->multiply($order_item
        ->getQuantity());
      $adjustment_amount = $this->rounder
        ->round($adjustment_amount);
      if ($adjustment_amount
        ->greaterThan($adjusted_total_price)) {

        // Don't reduce the order item total price past zero.
        $adjustment_amount = $adjusted_total_price;
      }
    }

    // Skip applying the promotion if there's no amount to discount.
    if ($adjustment_amount
      ->isZero()) {
      return;
    }
    $order_item
      ->addAdjustment(new Adjustment([
      'type' => 'promotion',
      'label' => $promotion
        ->getDisplayName() ?: $this
        ->t('Discount'),
      'amount' => $adjustment_amount
        ->multiply('-1'),
      'source_id' => $promotion
        ->id(),
      'included' => $this->configuration['display_inclusive'],
    ]));
  }

}

Classes

Name	Description
OrderItemFixedAmountOff	Provides the percentage off offer for order items.