CartEventSubscriber.php

<?php

namespace Drupal\commerce_log\EventSubscriber;

use Drupal\commerce_cart\Event\CartEntityAddEvent;
use Drupal\commerce_cart\Event\CartEvents;
use Drupal\commerce_cart\Event\CartOrderItemRemoveEvent;
use Drupal\commerce_cart\Event\CartOrderItemUpdateEvent;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

class CartEventSubscriber implements EventSubscriberInterface {

  /**
   * The log storage.
   *
   * @var \Drupal\commerce_log\LogStorageInterface
   */
  protected $logStorage;

  /**
   * Constructs a new CartEventSubscriber object.
   *
   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
   *   The entity type manager.
   */
  public function __construct(EntityTypeManagerInterface $entity_type_manager) {
    $this->logStorage = $entity_type_manager->getStorage('commerce_log');
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events = [
      CartEvents::CART_ENTITY_ADD => ['onCartEntityAdd', -100],
      CartEvents::CART_ORDER_ITEM_REMOVE => ['onCartOrderItemRemove', -100],
      CartEvents::CART_ORDER_ITEM_UPDATE => ['onCartOrderItemUpdate', -100],
    ];
    return $events;
  }

  /**
   * Creates a log when an entity has been added to the cart.
   *
   * @param \Drupal\commerce_cart\Event\CartEntityAddEvent $event
   *   The cart event.
   */
  public function onCartEntityAdd(CartEntityAddEvent $event) {
    $cart = $event->getCart();
    $purchased_entity = $event->getOrderItem()->getPurchasedEntity();
    $this->logStorage->generate($cart, 'cart_entity_added', [
      'purchased_entity_label' => $purchased_entity->label(),
    ])->save();
  }

  /**
   * Creates a log when an order item has been removed from the cart.
   *
   * @param \Drupal\commerce_cart\Event\CartOrderItemRemoveEvent $event
   *   The cart event.
   */
  public function onCartOrderItemRemove(CartOrderItemRemoveEvent $event) {
    $cart = $event->getCart();
    $order_item = $event->getOrderItem();
    $this->logStorage->generate($cart, 'cart_item_removed', [
      'purchased_entity_label' => $order_item->getPurchasedEntity()->label(),
    ])->save();
  }

  /**
   * Creates a log when a quantity is updated.
   *
   * @param \Drupal\commerce_cart\Event\CartOrderItemUpdateEvent $event
   *   The transition event.
   */
  public function onCartOrderItemUpdate(CartOrderItemUpdateEvent $event) {
    $cart = $event->getCart();
    $order_item = $event->getOrderItem();
    $original_order_item = $event->getOriginalOrderItem();
    $this->logStorage->generate($cart, 'cart_item_quantity_changed', [
      'purchased_entity_label' => $order_item->getPurchasedEntity()->label(),
      'original_quantity' => $original_order_item->getQuantity(),
      'quantity' => $order_item->getQuantity(),
    ])->save();
  }

}