<?php

namespace Drupal\mymodule\Plugin\Block;

use Drupal\commerce_cart\CartProviderInterface;
use Drupal\commerce_checkout\CheckoutOrderManagerInterface;
use Drupal\commerce_checkout\Plugin\Block\CheckoutProgressBlock as BaseBlock;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Provides a checkout progress block.
 *
 * @Block(
 *   id = "mymodule_commerce_checkout_progress",
 *   admin_label = @Translation("Desmazieres - Checkout progress"),
 *   category = @Translation("Commerce")
 * )
 */
class CheckoutProgressBlock extends BaseBlock implements ContainerFactoryPluginInterface {

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

  /**
   * {@inheritDoc}
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, CheckoutOrderManagerInterface $checkout_order_manager, RouteMatchInterface $route_match, CartProviderInterface $cart_provider) {
    parent::__construct($configuration, $plugin_id, $plugin_definition, $checkout_order_manager, $route_match);

    $this->cartProvider = $cart_provider;
  }

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    return new static(
      $configuration,
      $plugin_id,
      $plugin_definition,
      $container->get('commerce_checkout.checkout_order_manager'),
      $container->get('current_route_match'),
      $container->get('commerce_cart.cart_provider')
    );
  }

  /**
   * Builds the checkout progress block.
   *
   * @return array
   *   A render array.
   *
   * @see \Drupal\commerce_cart\Plugin\Block\CartBlock::build();
   */
  public function build() {
    // Try to build regularly.
    $build = parent::build();

    // If nothing found, try to get the current Cart and rebuild.
    if (empty($build) && $this->routeMatch->getRouteName() == 'commerce_cart.page') {
      $carts = $this->cartProvider->getCarts();
      $carts = array_filter($carts, function ($cart) {
        return $cart->hasItems() && $cart->cart->value;
      });

      if (!empty($carts)) {
        $order = reset($carts);
        $build = parent::render($order);
      }
    }

    return $build;
  }
}