class BasicSettingsForm

class BasicSettingsForm extends ConfigFormBase {
  
  /**
   * The theme handler.
   *
   * @var \Drupal\Core\Extension\ThemeHandlerInterface
   */
  protected $themeHandler;
  
  /**
   * Constructs a \Drupal\views_ui\Form\BasicSettingsForm object.
   *
   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
   *   The factory for configuration objects.
   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
   *   The theme handler.
   */
  public function __construct(ConfigFactoryInterface $config_factory, ThemeHandlerInterface $theme_handler) {
    parent::__construct($config_factory);
    $this->themeHandler = $theme_handler;
  }
  
  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container) {
    return new static($container->get('config.factory'), $container->get('theme_handler'));
  }
  
  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'views_ui_admin_settings_basic';
  }
  
  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames() {
    return [
      'views.settings',
    ];
  }
  
  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state) {
    $form = parent::buildForm($form, $form_state);
    $config = $this->config('views.settings');
    $options = [];
    foreach ($this->themeHandler
      ->listInfo() as $name => $theme) {
      if ($theme->status) {
        $options[$name] = $theme->info['name'];
      }
    }
    // This is not currently a fieldset but we may want it to be later,
    // so this will make it easier to change if we do.
    $form['basic'] = [];
    $form['basic']['ui_show_default_display'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Always show the default display'),
      '#default_value' => $config->get('ui.show.default_display'),
    ];
    $form['basic']['ui_show_advanced_column'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Always show advanced display settings'),
      '#default_value' => $config->get('ui.show.advanced_column'),
    ];
    $form['basic']['ui_show_display_embed'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Allow embedded displays'),
      '#description' => $this->t('Embedded displays can be used in code via views_embed_view().'),
      '#default_value' => $config->get('ui.show.display_embed'),
    ];
    $form['basic']['ui_exposed_filter_any_label'] = [
      '#type' => 'select',
      '#title' => $this->t('Label for "Any" value on non-required single-select exposed filters'),
      '#options' => [
        'old_any' => '<Any>',
        'new_any' => $this->t('- Any -'),
      ],
      '#default_value' => $config->get('ui.exposed_filter_any_label'),
    ];
    $form['live_preview'] = [
      '#type' => 'details',
      '#title' => $this->t('Live preview settings'),
      '#open' => TRUE,
    ];
    $form['live_preview']['ui_always_live_preview'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Automatically update preview on changes'),
      '#default_value' => $config->get('ui.always_live_preview'),
    ];
    $form['live_preview']['ui_show_preview_information'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Show information and statistics about the view during live preview'),
      '#default_value' => $config->get('ui.show.preview_information'),
    ];
    $form['live_preview']['options'] = [
      '#type' => 'container',
      '#states' => [
        'visible' => [
          ':input[name="ui_show_preview_information"]' => [
            'checked' => TRUE,
          ],
        ],
      ],
    ];
    $form['live_preview']['options']['ui_show_sql_query_enabled'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Show the SQL query'),
      '#default_value' => $config->get('ui.show.sql_query.enabled'),
    ];
    $form['live_preview']['options']['ui_show_sql_query_where'] = [
      '#type' => 'radios',
      '#states' => [
        'visible' => [
          ':input[name="ui_show_sql_query_enabled"]' => [
            'checked' => TRUE,
          ],
        ],
      ],
      '#title' => $this->t('Show SQL query'),
      '#options' => [
        'above' => $this->t('Above the preview'),
        'below' => $this->t('Below the preview'),
      ],
      '#default_value' => $config->get('ui.show.sql_query.where'),
    ];
    $form['live_preview']['options']['ui_show_performance_statistics'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Show performance statistics'),
      '#default_value' => $config->get('ui.show.performance_statistics'),
    ];
    $form['live_preview']['options']['ui_show_additional_queries'] = [
      '#type' => 'checkbox',
      '#title' => $this->t('Show other queries run during render during live preview'),
      '#description' => $this->t("Drupal has the potential to run many queries while a view is being rendered. Checking this box will display every query run during view render as part of the live preview."),
      '#default_value' => $config->get('ui.show.additional_queries'),
    ];
    return $form;
  }
  
  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this->config('views.settings')
      ->set('ui.show.default_display', $form_state->getValue('ui_show_default_display'))
      ->set('ui.show.advanced_column', $form_state->getValue('ui_show_advanced_column'))
      ->set('ui.show.display_embed', $form_state->getValue('ui_show_display_embed'))
      ->set('ui.exposed_filter_any_label', $form_state->getValue('ui_exposed_filter_any_label'))
      ->set('ui.always_live_preview', $form_state->getValue('ui_always_live_preview'))
      ->set('ui.show.preview_information', $form_state->getValue('ui_show_preview_information'))
      ->set('ui.show.sql_query.where', $form_state->getValue('ui_show_sql_query_where'))
      ->set('ui.show.sql_query.enabled', $form_state->getValue('ui_show_sql_query_enabled'))
      ->set('ui.show.performance_statistics', $form_state->getValue('ui_show_performance_statistics'))
      ->set('ui.show.additional_queries', $form_state->getValue('ui_show_additional_queries'))
      ->save();
    parent::submitForm($form, $form_state);
  }

}