class LayoutBuilderTestHooks

class LayoutBuilderTestHooks {
    
    /**
     * Implements hook_plugin_filter_TYPE__CONSUMER_alter().
     */
    public function pluginFilterBlockLayoutBuilderAlter(array &$definitions, array $extra) : void {
        // Explicitly remove the "Help" blocks from the list.
        unset($definitions['help_block']);
        // Explicitly remove the "Sticky at top of lists field_block".
        $disallowed_fields = [
            'sticky',
        ];
        // Remove "Changed" field if this is the first section.
        if ($extra['delta'] === 0) {
            $disallowed_fields[] = 'changed';
        }
        foreach ($definitions as $plugin_id => $definition) {
            // Field block IDs are in the form 'field_block:{entity}:{bundle}:{name}',
            // for example 'field_block:node:article:revision_timestamp'.
            preg_match('/field_block:.*:.*:(.*)/', $plugin_id, $parts);
            if (isset($parts[1]) && in_array($parts[1], $disallowed_fields, TRUE)) {
                // Unset any field blocks that match our predefined list.
                unset($definitions[$plugin_id]);
            }
        }
    }
    
    /**
     * Implements hook_entity_extra_field_info().
     */
    public function entityExtraFieldInfo() {
        $extra['node']['bundle_with_section_field']['display']['layout_builder_test'] = [
            'label' => t('Extra label'),
            'description' => t('Extra description'),
            'weight' => 0,
        ];
        $extra['node']['bundle_with_section_field']['display']['layout_builder_test_2'] = [
            'label' => t('Extra Field 2'),
            'description' => t('Extra Field 2 description'),
            'weight' => 0,
            'visible' => FALSE,
        ];
        return $extra;
    }
    
    /**
     * Implements hook_form_BASE_FORM_ID_alter() for layout_builder_configure_block.
     */
    public function formLayoutBuilderConfigureBlockAlter(&$form, FormStateInterface $form_state, $form_id) : void {
        
        /** @var \Drupal\layout_builder\Form\ConfigureBlockFormBase $form_object */
        $form_object = $form_state->getFormObject();
        $form['layout_builder_test']['storage'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Storage: ' . $form_object->getSectionStorage()
                ->getStorageId(),
        ];
        $form['layout_builder_test']['section'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Section: ' . $form_object->getCurrentSection()
                ->getLayoutId(),
        ];
        $form['layout_builder_test']['component'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Component: ' . $form_object->getCurrentComponent()
                ->getPluginId(),
        ];
    }
    
    /**
     * Implements hook_form_BASE_FORM_ID_alter() for layout_builder_configure_section.
     */
    public function formLayoutBuilderConfigureSectionAlter(&$form, FormStateInterface $form_state, $form_id) : void {
        
        /** @var \Drupal\layout_builder\Form\ConfigureSectionForm $form_object */
        $form_object = $form_state->getFormObject();
        $form['layout_builder_test']['storage'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Storage: ' . $form_object->getSectionStorage()
                ->getStorageId(),
        ];
        $form['layout_builder_test']['section'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Section: ' . $form_object->getCurrentSection()
                ->getLayoutId(),
        ];
        $form['layout_builder_test']['layout'] = [
            '#type' => 'item',
            '#title' => 'Layout Builder Layout: ' . $form_object->getCurrentLayout()
                ->getPluginId(),
        ];
    }
    
    /**
     * Implements hook_entity_form_display_alter().
     */
    public function layoutBuilderEntityFormDisplayAlter(EntityFormDisplayInterface $form_display, array $context) {
        if ($context['form_mode'] === 'layout_builder') {
            $form_display->setComponent('status', [
                'type' => 'boolean_checkbox',
                'settings' => [
                    'display_label' => TRUE,
                ],
            ]);
        }
    }
    
    /**
     * Implements hook_system_breadcrumb_alter().
     */
    public function systemBreadcrumbAlter(Breadcrumb &$breadcrumb, RouteMatchInterface $route_match, array $context) : void {
        $breadcrumb->addLink(Link::fromTextAndUrl('External link', Url::fromUri('http://www.example.com')));
    }
    
    /**
     * Implements hook_theme().
     */
    public function theme() : array {
        return [
            'block__preview_aware_block' => [
                'base hook' => 'block',
            ],
        ];
    }

}