<?php

namespace Drupal\search\Plugin\Block;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Block\Attribute\Block;
use Drupal\Core\Block\BlockBase;
use Drupal\Core\Form\FormBuilderInterface;
use Drupal\Core\Form\FormStateInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\Core\Session\AccountInterface;
use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\search\Form\SearchBlockForm;
use Drupal\search\SearchPageRepositoryInterface;

/**
 * Provides a 'Search form' block.
 */
#[Block(
  id: "search_form_block",
  admin_label: new TranslatableMarkup("Search form"),
  category: new TranslatableMarkup("Forms"),
)]
class SearchBlock extends BlockBase implements ContainerFactoryPluginInterface {

  /**
   * The form builder.
   *
   * @var \Drupal\Core\Form\FormBuilderInterface
   */
  protected $formBuilder;

  /**
   * The search page repository.
   *
   * @var \Drupal\search\SearchPageRepositoryInterface
   */
  protected $searchPageRepository;

  /**
   * Constructs a new SearchLocalTask.
   *
   * @param array $configuration
   *   A configuration array containing information about the plugin instance.
   * @param string $plugin_id
   *   The plugin ID for the plugin instance.
   * @param mixed $plugin_definition
   *   The plugin implementation definition.
   * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
   *   The form builder.
   * @param \Drupal\search\SearchPageRepositoryInterface $search_page_repository
   *   The search page repository.
   */
  public function __construct(array $configuration, $plugin_id, $plugin_definition, FormBuilderInterface $form_builder, SearchPageRepositoryInterface $search_page_repository) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
    $this->formBuilder = $form_builder;
    $this->searchPageRepository = $search_page_repository;
  }

  /**
   * {@inheritdoc}
   */
  protected function blockAccess(AccountInterface $account) {
    return AccessResult::allowedIfHasPermission($account, 'search content');
  }

  /**
   * {@inheritdoc}
   */
  public function build() {
    $page = $this->configuration['page_id'] ?? NULL;
    return $this->formBuilder->getForm(SearchBlockForm::class, $page);
  }

  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() {
    return [
      'page_id' => NULL,
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    // The configuration for this block is which search page to connect the
    // form to. Options are all configured/active search pages.
    $options = [];
    $active_search_pages = $this->searchPageRepository->getActiveSearchPages();
    foreach ($this->searchPageRepository->sortSearchPages($active_search_pages) as $entity_id => $entity) {
      $options[$entity_id] = $entity->label();
    }

    $form['page_id'] = [
      '#type' => 'select',
      '#title' => $this->t('Search page'),
      '#description' => $this->t('The search page that the form submits to, or Default for the default search page.'),
      '#default_value' => $this->configuration['page_id'],
      '#options' => $options,
      '#empty_option' => $this->t('Default'),
      '#empty_value' => '',
    ];

    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) {
    // Handle the #empty_value: using the default requires specifying `null` in
    // the config.
    // @see search.schema.yml
    // @see \Drupal\search\Form\SearchBlockForm::buildForm()
    $this->configuration['page_id'] = $form_state->getValue('page_id') ?: NULL;
  }

}
