contacts_events-8.x-1.x-dev/modules/contacts_events_segments/src/EventSubscriber/PriceCalculationSubscriber.php

<?php

namespace Drupal\contacts_events_segments\EventSubscriber;

use Drupal\contacts_events\Entity\TicketInterface;
use Drupal\contacts_events\Event\PriceCalculationEvent;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;

/**
 * Price subscriber for partial tickets.
 */
class PriceCalculationSubscriber implements EventSubscriberInterface {

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    return [
      PriceCalculationEvent::NAME => [
        ['adjustDayTickets'],
      ],
    ];
  }

  /**
   * Changes ticket price for day tickets.
   *
   * @param \Drupal\contacts_events\Event\PriceCalculationEvent $event
   *   Event.
   */
  public function adjustDayTickets(PriceCalculationEvent $event): void {
    $ticket = $this->getValidTicket($event);
    if (!$ticket) {
      return;
    }

    // Nothing to do if it's not a day ticket.
    if (!$this->hasSegments($ticket)) {
      return;
    }

    $booking_window = $event->getMapping()['booking_window'];
    $class = $event->getMapping()['class'];

    $total_price = $event->getCalculatedPrice()->multiply('0');
    /** @var \Drupal\contacts_events_segments\Entity\SegmentInterface $segment */
    foreach ($ticket->get('segments')->referencedEntities() as $segment) {
      /** @var \Drupal\contacts_events\Plugin\Field\FieldType\PriceMapItem[][] $price_map */
      $price_map = $segment->get('price')->getPriceMap();
      if (isset($price_map[$booking_window][$class])) {
        $total_price = $total_price->add($price_map[$booking_window][$class]->toPrice());
      }
    }
    $event->setPrice($total_price);
  }

  /**
   * Get and validate the ticket for the event, if there is one.
   *
   * A valid ticket is one that has successfully got a price mapping.
   *
   * @param \Drupal\contacts_events\Event\PriceCalculationEvent $event
   *   The calculation event.
   *
   * @return \Drupal\contacts_events\Entity\TicketInterface|null
   *   The ticket if there is one and it is valid, NULL otherwise.
   */
  protected function getValidTicket(PriceCalculationEvent $event): ?TicketInterface {
    // We only want to deal with tickets that have a mapping.
    if ($event->getOrderItem()->bundle() != 'contacts_ticket' || !$event->getMapping() || !$event->getPrice()) {
      return NULL;
    }
    return $event->getPurchasedEntity();
  }

  /**
   * Check whether the ticket has segments.
   *
   * @param \Drupal\contacts_events\Entity\TicketInterface $ticket
   *   The ticket.
   *
   * @return bool
   *   Whether the ticket has segments.
   */
  protected function hasSegments(TicketInterface $ticket): bool {
    // Ensure the segment field exists.
    if (!$ticket->hasField('segments')) {
      return FALSE;
    }

    return !$ticket->get('segments')->isEmpty();
  }

}