AddToCartForm.php

<?php

namespace Drupal\commerce_cart\Form;

use Drupal\commerce\Context;
use Drupal\commerce_cart\CartManagerInterface;
use Drupal\commerce_cart\CartProviderInterface;
use Drupal\commerce_order\Resolver\OrderTypeResolverInterface;
use Drupal\commerce_price\Resolver\ChainPriceResolverInterface;
use Drupal\commerce_store\CurrentStoreInterface;
use Drupal\commerce_store\SelectStoreTrait;
use Drupal\Component\Datetime\TimeInterface;
use Drupal\Core\Entity\ContentEntityForm;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Entity\EntityRepositoryInterface;
use Drupal\Core\Entity\EntityTypeBundleInfoInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides the order item add to cart form.
 */
class AddToCartForm extends ContentEntityForm implements AddToCartFormInterface {

  use SelectStoreTrait;

  /**
   * The cart manager.
   *
   * @var \Drupal\commerce_cart\CartManagerInterface
   */
  protected $cartManager;

  /**
   * The cart provider.
   *
   * @var \Drupal\commerce_cart\CartProviderInterface
   */
  protected $cartProvider;

  /**
   * The order type resolver.
   *
   * @var \Drupal\commerce_order\Resolver\OrderTypeResolverInterface
   */
  protected $orderTypeResolver;

  /**
   * The current store.
   *
   * @var \Drupal\commerce_store\CurrentStoreInterface
   */
  protected $currentStore;

  /**
   * The chain base price resolver.
   *
   * @var \Drupal\commerce_price\Resolver\ChainPriceResolverInterface
   */
  protected $chainPriceResolver;

  /**
   * The current user.
   *
   * @var \Drupal\Core\Session\AccountInterface
   */
  protected $currentUser;

  /**
   * The form ID.
   *
   * @var string
   */
  protected $formId;

  /**
   * Constructs a new AddToCartForm object.
   *
   * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
   *   The entity repository.
   * @param \Drupal\Core\Entity\EntityTypeBundleInfoInterface $entity_type_bundle_info
   *   The entity type bundle info.
   * @param \Drupal\Component\Datetime\TimeInterface $time
   *   The time.
   * @param \Drupal\commerce_cart\CartManagerInterface $cart_manager
   *   The cart manager.
   * @param \Drupal\commerce_cart\CartProviderInterface $cart_provider
   *   The cart provider.
   * @param \Drupal\commerce_order\Resolver\OrderTypeResolverInterface $order_type_resolver
   *   The order type resolver.
   * @param \Drupal\commerce_store\CurrentStoreInterface $current_store
   *   The current store.
   * @param \Drupal\commerce_price\Resolver\ChainPriceResolverInterface $chain_price_resolver
   *   The chain base price resolver.
   * @param \Drupal\Core\Session\AccountInterface $current_user
   *   The current user.
   */
  public function __construct(EntityRepositoryInterface $entity_repository, EntityTypeBundleInfoInterface $entity_type_bundle_info, TimeInterface $time, CartManagerInterface $cart_manager, CartProviderInterface $cart_provider, OrderTypeResolverInterface $order_type_resolver, CurrentStoreInterface $current_store, ChainPriceResolverInterface $chain_price_resolver, AccountInterface $current_user) {
    parent::__construct($entity_repository, $entity_type_bundle_info, $time);

    $this->cartManager = $cart_manager;
    $this->cartProvider = $cart_provider;
    $this->orderTypeResolver = $order_type_resolver;
    $this->currentStore = $current_store;
    $this->chainPriceResolver = $chain_price_resolver;
    $this->currentUser = $current_user;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static(
      $container->get('entity.repository'),
      $container->get('entity_type.bundle.info'),
      $container->get('datetime.time'),
      $container->get('commerce_cart.cart_manager'),
      $container->get('commerce_cart.cart_provider'),
      $container->get('commerce_order.chain_order_type_resolver'),
      $container->get('commerce_store.current_store'),
      $container->get('commerce_price.chain_price_resolver'),
      $container->get('current_user')
    );
  }

  /**
   * {@inheritdoc}
   */
  public function setEntity(EntityInterface $entity) {
    $this->entity = $entity;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function getBaseFormId() {
    return $this->entity->getEntityTypeId() . '_' . $this->operation . '_form';
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    if (empty($this->formId)) {
      $this->formId = $this->getBaseFormId();
      /** @var \Drupal\commerce_order\Entity\OrderItemInterface $order_item */
      $order_item = $this->entity;
      if ($purchased_entity = $order_item->getPurchasedEntity()) {
        $this->formId .= '_' . $purchased_entity->getEntityTypeId() . '_' . $purchased_entity->id();
      }
    }

    return $this->formId;
  }

  /**
   * {@inheritdoc}
   */
  public function setFormId($form_id) {
    $this->formId = $form_id;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form = parent::buildForm($form, $form_state);
    // The widgets are allowed to signal that the form should be hidden
    // (because there's no purchasable entity to select, for example).
    if ($form_state->get('hide_form')) {
      $form['#access'] = FALSE;
    }

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  protected function actions(array $form, FormStateInterface $form_state) {
    $actions['submit'] = [
      '#type' => 'submit',
      '#value' => $this->t('Add to cart'),
      '#submit' => ['::submitForm'],
      '#attributes' => [
        'class' => ['button--add-to-cart'],
      ],
    ];

    return $actions;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    parent::submitForm($form, $form_state);

    /** @var \Drupal\commerce_order\Entity\OrderItemInterface $order_item */
    $order_item = $this->entity;
    /** @var \Drupal\commerce\PurchasableEntityInterface $purchased_entity */
    $purchased_entity = $order_item->getPurchasedEntity();

    $cart = $order_item->getOrder();
    if (!$cart) {
      $order_type_id = $this->orderTypeResolver->resolve($order_item);
      $store = $this->selectStore($purchased_entity);
      $cart = $this->cartProvider->createCart($order_type_id, $store);
    }
    $this->entity = $this->cartManager->addOrderItem($cart, $order_item, $form_state->get(['settings', 'combine']));
    // Other submit handlers might need the cart ID.
    $form_state->set('cart_id', $cart->id());
  }

  /**
   * {@inheritdoc}
   */
  public function buildEntity(array $form, FormStateInterface $form_state) {
    /** @var \Drupal\commerce_order\Entity\OrderItemInterface $entity */
    $entity = parent::buildEntity($form, $form_state);
    // Now that the purchased entity is set, populate the title and price.
    $purchased_entity = $entity->getPurchasedEntity();
    $entity->setTitle($purchased_entity->getOrderItemTitle());
    if (!$entity->isUnitPriceOverridden()) {
      $store = $this->selectStore($purchased_entity);
      $context = new Context($this->currentUser, $store);
      $resolved_price = $this->chainPriceResolver->resolve($purchased_entity, $entity->getQuantity(), $context);
      $entity->setUnitPrice($resolved_price);
    }
    $order_type_id = $this->orderTypeResolver->resolve($entity);
    $store = $this->selectStore($purchased_entity);
    $cart = $this->cartProvider->getCart($order_type_id, $store);
    if ($cart) {
      $entity->set('order_id', $cart->id());
    }

    return $entity;
  }

}