class Callbacks

class Callbacks {
    
    /**
     * Ajax callback triggered by select.
     */
    public static function selectCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new HtmlCommand('#ajax_selected_color', $form_state->getValue('select')));
        $response->addCommand(new DataCommand('#ajax_selected_color', 'form_state_value_select', $form_state->getValue('select')));
        return $response;
    }
    
    /**
     * Ajax callback triggered by date.
     */
    public static function dateCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $date = $form_state->getValue('date');
        $response->addCommand(new HtmlCommand('#ajax_date_value', sprintf('<div>%s</div>', $date)));
        $response->addCommand(new DataCommand('#ajax_date_value', 'form_state_value_date', $form_state->getValue('date')));
        return $response;
    }
    
    /**
     * Ajax callback triggered by datetime.
     */
    public static function datetimeCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $datetime = $form_state->getValue('datetime')['date'] . ' ' . $form_state->getValue('datetime')['time'];
        $response = new AjaxResponse();
        $response->addCommand(new HtmlCommand('#ajax_datetime_value', sprintf('<div>%s</div>', $datetime)));
        $response->addCommand(new DataCommand('#ajax_datetime_value', 'form_state_value_datetime', $datetime));
        return $response;
    }
    
    /**
     * Ajax callback triggered by checkbox.
     */
    public static function checkboxCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new HtmlCommand('#ajax_checkbox_value', $form_state->getValue('checkbox') ? 'checked' : 'unchecked'));
        $response->addCommand(new DataCommand('#ajax_checkbox_value', 'form_state_value_select', (int) $form_state->getValue('checkbox')));
        return $response;
    }
    
    /**
     * Ajax callback to confirm image button was submitted.
     */
    public static function imageButtonCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new HtmlCommand('#ajax_image_button_result', "<div id='ajax-1-more-div'>Something witty!</div>"));
        return $response;
    }
    
    /**
     * Ajax callback triggered by the checkbox in a #group.
     */
    public static function checkboxGroupCallback($form, FormStateInterface $form_state) : array {
        return $form['checkbox_in_group_wrapper'];
    }
    
    /**
     * Ajax form callback: Selects 'after'.
     */
    public static function advancedCommandsAfterCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $selector = '#after_div';
        $response = new AjaxResponse();
        $response->addCommand(new AfterCommand($selector, "This will be placed after"));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'alert'.
     */
    public static function advancedCommandsAlertCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new AlertCommand('Alert'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'announce' with no priority specified.
     */
    public static function advancedCommandsAnnounceCallback($form, FormStateInterface $form_state) : AjaxResponse {
        return (new AjaxResponse())->addCommand(new AnnounceCommand('Default announcement.'));
    }
    
    /**
     * Ajax form callback: Selects 'announce' with 'polite' priority.
     */
    public static function advancedCommandsAnnouncePoliteCallback($form, FormStateInterface $form_state) : AjaxResponse {
        return (new AjaxResponse())->addCommand(new AnnounceCommand('Polite announcement.', 'polite'));
    }
    
    /**
     * Ajax form callback: Selects 'announce' with 'assertive' priority.
     */
    public static function advancedCommandsAnnounceAssertiveCallback($form, FormStateInterface $form_state) : AjaxResponse {
        return (new AjaxResponse())->addCommand(new AnnounceCommand('Assertive announcement.', 'assertive'));
    }
    
    /**
     * Ajax form callback: Selects 'announce' with two announce commands returned.
     */
    public static function advancedCommandsDoubleAnnounceCallback($form, FormStateInterface $form_state) : AjaxResponse {
        return (new AjaxResponse())->addCommand(new AnnounceCommand('Assertive announcement.', 'assertive'))
            ->addCommand(new AnnounceCommand('Another announcement.'));
    }
    
    /**
     * Ajax form callback: Selects 'append'.
     */
    public static function advancedCommandsAppendCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $selector = '#append_div';
        $response = new AjaxResponse();
        $response->addCommand(new AppendCommand($selector, "Appended text"));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'before'.
     */
    public static function advancedCommandsBeforeCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $selector = '#before_div';
        $response = new AjaxResponse();
        $response->addCommand(new BeforeCommand($selector, "Before text"));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'changed'.
     */
    public static function advancedCommandsChangedCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new ChangedCommand('#changed_div'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'changed' with asterisk marking inner div.
     */
    public static function advancedCommandsChangedAsteriskCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new ChangedCommand('#changed_div', '#changed_div_mark_this'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'css'.
     */
    public static function advancedCommandsCssCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $selector = '#css_div';
        $color = 'blue';
        $response = new AjaxResponse();
        $response->addCommand(new CssCommand($selector, [
            'background-color' => $color,
        ]));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'data'.
     */
    public static function advancedCommandsDataCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $selector = '#data_div';
        $response = new AjaxResponse();
        $response->addCommand(new DataCommand($selector, 'test_key', 'test_value'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'invoke'.
     */
    public static function advancedCommandsInvokeCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new InvokeCommand('#invoke_div', 'addClass', [
            'error',
        ]));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'html'.
     */
    public static function advancedCommandsHtmlCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new HtmlCommand('#html_div', 'replacement text'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'insert'.
     */
    public static function advancedCommandsInsertCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new InsertCommand('#insert_div', 'insert replacement text'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'prepend'.
     */
    public static function advancedCommandsPrependCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new PrependCommand('#prepend_div', "prepended text"));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'remove'.
     */
    public static function advancedCommandsRemoveCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new RemoveCommand('#remove_text'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'restripe'.
     */
    public static function advancedCommandsRestripeCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new RestripeCommand('#restripe_table'));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects 'settings'.
     */
    public static function advancedCommandsSettingsCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $setting['ajax_forms_test']['foo'] = 42;
        $response = new AjaxResponse();
        $response->addCommand(new SettingsCommand($setting));
        return $response;
    }
    
    /**
     * Ajax callback for 'add_css'.
     */
    public static function advancedCommandsAddCssCallback($form, FormStateInterface $form_state) : AjaxResponse {
        $response = new AjaxResponse();
        $response->addCommand(new AddCssCommand([
            [
                'href' => 'my/file.css',
                'media' => 'all',
            ],
            [
                'href' => 'https://example.com/css?family=Open+Sans',
                'media' => 'all',
            ],
        ]));
        return $response;
    }
    
    /**
     * Ajax form callback: Selects the 'driver_text' element of the validation form.
     */
    public static function validationFormCallback($form, FormStateInterface $form_state) : array {
        \Drupal::messenger()->addStatus("ajax_forms_test_validation_form_callback invoked");
        \Drupal::messenger()->addStatus(t("Callback: driver_text=%driver_text, spare_required_field=%spare_required_field", [
            '%driver_text' => $form_state->getValue('driver_text'),
            '%spare_required_field' => $form_state->getValue('spare_required_field'),
        ]));
        return [
            '#markup' => '<div id="message_area">ajax_forms_test_validation_form_callback at ' . date('c') . '</div>',
        ];
    }
    
    /**
     * Ajax form callback: Selects the 'driver_number' element of the validation form.
     */
    public static function validationNumberFormCallback($form, FormStateInterface $form_state) : array {
        \Drupal::messenger()->addStatus("ajax_forms_test_validation_number_form_callback invoked");
        \Drupal::messenger()->addStatus(t("Callback: driver_number=%driver_number, spare_required_field=%spare_required_field", [
            '%driver_number' => $form_state->getValue('driver_number'),
            '%spare_required_field' => $form_state->getValue('spare_required_field'),
        ]));
        return [
            '#markup' => '<div id="message_area_number">ajax_forms_test_validation_number_form_callback at ' . date('c') . '</div>',
        ];
    }
    
    /**
     * AJAX form callback: Selects for the ajax_forms_test_lazy_load_form() form.
     */
    public static function lazyLoadFormAjax($form, FormStateInterface $form_state) : array {
        $build = [
            '#markup' => 'new content',
        ];
        if ($form_state->getValue('add_files')) {
            $build['#attached']['library'][] = 'system/admin';
            $build['#attached']['library'][] = 'system/drupal.system';
            $build['#attached']['drupalSettings']['ajax_forms_test_lazy_load_form_submit'] = 'executed';
        }
        return $build;
    }

}