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;
    }

}