class LayoutBuilderIntegration

class LayoutBuilderIntegration implements ContainerInjectionInterface {
    use LoggerChannelTrait;
    
    /**
     * The section storage manager.
     *
     * @var \Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface
     */
    protected $sectionStorageManager;
    
    /**
     * The current user.
     *
     * @var \Drupal\Core\Session\AccountInterface
     */
    protected $currentUser;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Constructs a new LayoutBuilderIntegration object.
     *
     * @param \Drupal\layout_builder\SectionStorage\SectionStorageManagerInterface $section_storage_manager
     *   The section storage manager.
     * @param \Drupal\Core\Session\AccountInterface $current_user
     *   The current user.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     */
    public function __construct(SectionStorageManagerInterface $section_storage_manager, AccountInterface $current_user, EntityTypeManagerInterface $entity_type_manager) {
        $this->sectionStorageManager = $section_storage_manager;
        $this->currentUser = $current_user;
        $this->entityTypeManager = $entity_type_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('plugin.manager.layout_builder.section_storage'), $container->get('current_user'), $container->get('entity_type.manager'));
    }
    
    /**
     * Alters the entity view build for Layout Builder compatibility.
     *
     * When rendering fields outside of normal view modes, Quick Edit requires
     * that modules identify themselves with a view mode ID in the format
     * [module_name]-[information the module needs to rerender], as prescribed by
     * hook_quickedit_render_field().
     *
     * @param array $build
     *   The built entity render array.
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity.
     * @param \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display
     *   The entity view display.
     *
     * @see hook_quickedit_render_field()
     * @see layout_builder_quickedit_render_field()
     */
    public function entityViewAlter(array &$build, EntityInterface $entity, EntityViewDisplayInterface $display) {
        if (!$entity instanceof FieldableEntityInterface || !isset($build['_layout_builder'])) {
            return;
        }
        $build['#cache']['contexts'][] = 'user.permissions';
        if (!$this->currentUser
            ->hasPermission('access in-place editing')) {
            return;
        }
        $cacheable_metadata = CacheableMetadata::createFromRenderArray($build);
        $section_list = $this->sectionStorageManager
            ->findByContext([
            'display' => EntityContext::fromEntity($display),
            'entity' => EntityContext::fromEntity($entity),
            'view_mode' => new Context(new ContextDefinition('string'), $display->getMode()),
        ], $cacheable_metadata);
        $cacheable_metadata->applyTo($build);
        if (empty($section_list)) {
            return;
        }
        // Create a hash of the sections and use it in the unique Quick Edit view
        // mode ID. Any changes to the sections will result in a different hash,
        // forcing Quick Edit's JavaScript to recognize any changes and retrieve
        // up-to-date metadata.
        $sections_hash = hash('sha256', serialize($section_list->getSections()));
        // Track each component by their plugin ID, delta, region, and UUID.
        $plugin_ids_to_update = [];
        foreach (Element::children($build['_layout_builder']) as $delta) {
            $section = $build['_layout_builder'][$delta];
            if (!Element::isEmpty($section)) {
                
                /** @var \Drupal\Core\Layout\LayoutDefinition $layout */
                $layout = $section['#layout'];
                $regions = $layout->getRegionNames();
                foreach ($regions as $region) {
                    if (isset($section[$region])) {
                        foreach ($section[$region] as $uuid => $component) {
                            if (isset($component['#plugin_id']) && $this->supportQuickEditOnComponent($component, $entity)) {
                                $plugin_ids_to_update[$component['#plugin_id']][$delta][$region][$uuid] = $uuid;
                            }
                        }
                    }
                }
            }
        }
        // @todo Remove when https://www.drupal.org/node/3041850 is resolved.
        $plugin_ids_to_update = array_filter($plugin_ids_to_update, function ($info) {
            // Delta, region, and UUID each count as one.
            return count($info, COUNT_RECURSIVE) === 3;
        });
        $plugin_ids_to_update = NestedArray::mergeDeepArray($plugin_ids_to_update, TRUE);
        foreach ($plugin_ids_to_update as $delta => $regions) {
            foreach ($regions as $region => $uuids) {
                foreach ($uuids as $uuid => $component) {
                    $build['_layout_builder'][$delta][$region][$uuid]['content']['#view_mode'] = static::getViewModeId($entity, $display, $delta, $uuid, $sections_hash);
                }
            }
        }
        // Alter the Quick Edit view mode ID of all fields outside of the Layout
        // Builder sections to force Quick Edit to request to the field metadata.
        // @todo Remove this logic in https://www.drupal.org/project/node/2966136.
        foreach (Element::children($build) as $field_name) {
            if ($field_name !== '_layout_builder') {
                $field_build =& $build[$field_name];
                if (isset($field_build['#view_mode'])) {
                    $field_build['#view_mode'] = "layout_builder-{$display->getMode()}-non_component-{$sections_hash}";
                }
            }
        }
    }
    
    /**
     * Generates a Quick Edit view mode ID.
     *
     * @param \Drupal\Core\Entity\EntityInterface $entity
     *   The entity.
     * @param \Drupal\Core\Entity\Display\EntityViewDisplayInterface $display
     *   The entity view display.
     * @param int $delta
     *   The delta.
     * @param string $component_uuid
     *   The component UUID.
     * @param string $sections_hash
     *   The hash of the sections; must change whenever the sections change.
     *
     * @return string
     *   The Quick Edit view mode ID.
     *
     * @see \Drupal\quickedit\LayoutBuilderIntegration::deconstructViewModeId()
     */
    private static function getViewModeId(EntityInterface $entity, EntityViewDisplayInterface $display, $delta, $component_uuid, $sections_hash) {
        return implode('-', [
            'layout_builder',
            $display->getMode(),
            $delta,
            // Replace the dashes in the component UUID because we need to
            // use dashes to join the parts.
str_replace('-', '_', $component_uuid),
            $entity->id(),
            $sections_hash,
        ]);
    }
    
    /**
     * Deconstructs the Quick Edit view mode ID into its constituent parts.
     *
     * @param string $quick_edit_view_mode_id
     *   The Quick Edit view mode ID.
     *
     * @return array
     *   An array containing the entity view mode ID, the delta, the component
     *   UUID, and the entity ID.
     *
     * @see \Drupal\quickedit\LayoutBuilderIntegration::getViewModeId()
     */
    public static function deconstructViewModeId($quick_edit_view_mode_id) {
        [
            ,
            $entity_view_mode_id,
            $delta,
            $component_uuid,
            $entity_id,
        ] = explode('-', $quick_edit_view_mode_id, 7);
        return [
            $entity_view_mode_id,
            // @todo Explicitly cast delta to an integer, remove this in
            //   https://www.drupal.org/project/drupal/issues/2984509.
(int) $delta,
            // Replace the underscores with dash to get back the component UUID.
str_replace('_', '-', $component_uuid),
            $entity_id,
        ];
    }
    
    /**
     * Re-renders a field rendered by Layout Builder, edited with Quick Edit.
     *
     * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
     *   The entity.
     * @param string $field_name
     *   The field name.
     * @param string $quick_edit_view_mode_id
     *   The Quick Edit view mode ID.
     * @param string $langcode
     *   The language code.
     *
     * @return array
     *   The re-rendered field.
     */
    public function quickEditRenderField(FieldableEntityInterface $entity, $field_name, $quick_edit_view_mode_id, $langcode) {
        [
            $entity_view_mode,
            $delta,
            $component_uuid,
        ] = static::deconstructViewModeId($quick_edit_view_mode_id);
        $entity_build = $this->entityTypeManager
            ->getViewBuilder($entity->getEntityTypeId())
            ->view($entity, $entity_view_mode, $langcode);
        $this->buildEntityView($entity_build);
        if (isset($entity_build['_layout_builder'][$delta])) {
            foreach (Element::children($entity_build['_layout_builder'][$delta]) as $region) {
                if (isset($entity_build['_layout_builder'][$delta][$region][$component_uuid])) {
                    return $entity_build['_layout_builder'][$delta][$region][$component_uuid]['content'];
                }
            }
        }
        $this->getLogger('layout_builder')
            ->warning('The field "%field" failed to render.', [
            '%field' => $field_name,
        ]);
        return [];
    }
    
    /**
     * {@inheritdoc}
     *
     * @todo Replace this hardcoded processing when
     *   https://www.drupal.org/project/drupal/issues/3041635 is resolved.
     *
     * @see \Drupal\Tests\EntityViewTrait::buildEntityView()
     */
    private function buildEntityView(array &$elements) {
        // If the default values for this element have not been loaded yet,
        // populate them.
        if (isset($elements['#type']) && empty($elements['#defaults_loaded'])) {
            $elements += \Drupal::service('element_info')->getInfo($elements['#type']);
        }
        // Make any final changes to the element before it is rendered. This means
        // that the $element or the children can be altered or corrected before
        // the element is rendered into the final text.
        if (isset($elements['#pre_render'])) {
            foreach ($elements['#pre_render'] as $callable) {
                $elements = call_user_func($callable, $elements);
            }
        }
        // And recurse.
        $children = Element::children($elements, TRUE);
        foreach ($children as $key) {
            $this->buildEntityView($elements[$key]);
        }
    }
    
    /**
     * Determines whether a component has Quick Edit support.
     *
     * Only field_block components for display configurable fields should be
     * supported.
     *
     * @param array $component
     *   The component render array.
     * @param \Drupal\Core\Entity\FieldableEntityInterface $entity
     *   The entity being displayed.
     *
     * @return bool
     *   Whether Quick Edit is supported on the component.
     *
     * @see \Drupal\layout_builder\Plugin\Block\FieldBlock
     */
    private function supportQuickEditOnComponent(array $component, FieldableEntityInterface $entity) {
        if (isset($component['content']['#field_name'], $component['#base_plugin_id']) && $component['#base_plugin_id'] === 'field_block' && $entity->hasField($component['content']['#field_name'])) {
            return $entity->getFieldDefinition($component['content']['#field_name'])
                ->isDisplayConfigurable('view');
        }
        return FALSE;
    }

}