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_master_display'] = [
            '#type' => 'checkbox',
            '#title' => $this->t('Always show the master (default) display'),
            '#default_value' => $config->get('ui.show.master_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' => t('Allow embedded displays'),
            '#description' => 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' => 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.master_display', $form_state->getValue('ui_show_master_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);
    }

}