class SwitchUserBlock

class SwitchUserBlock extends BlockBase implements ContainerFactoryPluginInterface {
  
  /**
   * The FormBuilder object.
   */
  protected FormBuilderInterface $formBuilder;
  
  /**
   * A helper for creating the user list form.
   */
  protected SwitchUserListHelper $switchUserListHelper;
  // phpcs:ignore Generic.CodeAnalysis.UselessOverridingMethod.Found
  public final function __construct(array $configuration, string $plugin_id, array $plugin_definition) {
    parent::__construct($configuration, $plugin_id, $plugin_definition);
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) : static {
    $instance = new static($configuration, $plugin_id, $plugin_definition);
    $instance->formBuilder = $container->get('form_builder');
    $instance->switchUserListHelper = $container->get('devel.switch_user_list_helper');
    $instance->stringTranslation = $container->get('string_translation');
    return $instance;
  }
  
  /**
   * {@inheritdoc}
   */
  public function defaultConfiguration() : array {
    return [
      'list_size' => 12,
      'include_anon' => FALSE,
      'show_form' => TRUE,
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  protected function blockAccess(AccountInterface $account) {
    return AccessResult::allowedIfHasPermission($account, 'switch users');
  }
  
  /**
   * {@inheritdoc}
   */
  public function blockForm($form, FormStateInterface $form_state) {
    $anonymous = new AnonymousUserSession();
    $form['list_size'] = [
      '#type' => 'number',
      '#title' => $this->t('Number of users to display in the list'),
      '#default_value' => $this->configuration['list_size'],
      '#min' => 1,
      '#max' => 50,
    ];
    $form['include_anon'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Include %anonymous', [
        '%anonymous' => $anonymous->getDisplayName(),
      ]),
      '#default_value' => $this->configuration['include_anon'],
    ];
    $form['show_form'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Allow entering any user name'),
      '#default_value' => $this->configuration['show_form'],
    ];
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function blockSubmit($form, FormStateInterface $form_state) : void {
    $this->configuration['list_size'] = $form_state->getValue('list_size');
    $this->configuration['include_anon'] = $form_state->getValue('include_anon');
    $this->configuration['show_form'] = $form_state->getValue('show_form');
  }
  
  /**
   * {@inheritdoc}
   */
  public function getCacheMaxAge() : int {
    return 0;
  }
  
  /**
   * {@inheritdoc}
   */
  public function build() : array {
    $build = [];
    if ($accounts = $this->switchUserListHelper
      ->getUsers($this->configuration['list_size'], $this->configuration['include_anon'])) {
      $build['devel_links'] = $this->switchUserListHelper
        ->buildUserList($accounts);
      if ($this->configuration['show_form']) {
        $build['devel_form'] = $this->formBuilder
          ->getForm(SwitchUserForm::class);
      }
    }
    return $build;
  }

}