commercetools-8.x-1.2-alpha1/modules/commercetools_content/src/Form/ProductSearchForm.php

<?php

namespace Drupal\commercetools_content\Form;

use Drupal\commercetools_content\Service\CommercetoolsContentComponents;
use Drupal\Core\Form\BaseFormIdInterface;
use Drupal\Core\Form\FormBase;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Url;

/**
 * Defines a simple product search form for embedding in a block.
 */
class ProductSearchForm extends FormBase implements BaseFormIdInterface {

  /**
   * {@inheritdoc}
   */
  public function getBaseFormId() {
    return 'commercetools_content_product_search_form';
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    // Try to fix an error with several identical forms on the same page.
    // @todo Remove after https://www.drupal.org/project/drupal/issues/2821852
    static $index = 0;
    return $this->getBaseFormId() . $index++;
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    [$productListIndex] = $form_state->getBuildInfo()['args'];
    $paramName = CommercetoolsContentComponents::getParamNameByIndex('search', $productListIndex);
    $form[$paramName] = [
      '#type' => 'textfield',
      '#default_value' => $this->getRequest()->query->get($paramName),
      '#size' => 15,
      '#attributes' => ['placeholder' => t('Product search')],
    ];

    $form['#attributes']['class'][] = 'search-form';
    $form['#attributes']['class'][] = 'commercetools-product-search-form';
    $form['#attributes']['class'][] = 'commercetools-content-product-search-form';
    $form['actions']['#type'] = 'actions';
    $form['actions']['submit'] = [
      '#type' => 'submit',
      '#value' => t('Search'),
      '#button_type' => 'primary',
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $query = $this->getRequest()->query->all();
    // Reset page after applying new facets.
    unset($query['page']);

    [$productListIndex, $targetPage] = $form_state->getBuildInfo()['args'];
    $paramName = CommercetoolsContentComponents::getParamNameByIndex('search', $productListIndex);
    $query[$paramName] = $form_state->getValue($paramName);

    $targetPage ??= Url::fromRoute('<current>');
    $targetPage->setOption('query', array_filter($query));
    $form_state->setRedirectUrl($targetPage);
  }

}