class CommentViewsHooks

class CommentViewsHooks {
    
    /**
     * Implements hook_views_data_alter().
     */
    public function viewsDataAlter(&$data) {
        // New comments are only supported for node table because it requires the
        // history table.
        $data['node']['new_comments'] = [
            'title' => t('New comments'),
            'help' => t('The number of new comments on the node.'),
            'field' => [
                'id' => 'node_new_comments',
                'no group by' => TRUE,
            ],
        ];
        // Provides an integration for each entity type except comment.
        foreach (\Drupal::entityTypeManager()->getDefinitions() as $entity_type_id => $entity_type) {
            if ($entity_type_id == 'comment' || !$entity_type->entityClassImplements(ContentEntityInterface::class) || !$entity_type->getBaseTable()) {
                continue;
            }
            $fields = \Drupal::service('comment.manager')->getFields($entity_type_id);
            $base_table = $entity_type->getDataTable() ?: $entity_type->getBaseTable();
            $args = [
                '@entity_type' => $entity_type_id,
            ];
            if ($fields) {
                $data[$base_table]['comments_link'] = [
                    'field' => [
                        'title' => t('Add comment link'),
                        'help' => t('Display the standard add comment link used on regular @entity_type, which will only display if the viewing user has access to add a comment.', $args),
                        'id' => 'comment_entity_link',
                    ],
                ];
                // Multilingual properties are stored in data table.
                if (!($table = $entity_type->getDataTable())) {
                    $table = $entity_type->getBaseTable();
                }
                $data[$table]['uid_touch'] = [
                    'title' => t('User posted or commented'),
                    'help' => t('Display nodes only if a user posted the @entity_type or commented on the @entity_type.', $args),
                    'argument' => [
                        'field' => 'uid',
                        'name table' => 'users_field_data',
                        'name field' => 'name',
                        'id' => 'argument_comment_user_uid',
                        'no group by' => TRUE,
                        'entity_type' => $entity_type_id,
                        'entity_id' => $entity_type->getKey('id'),
                    ],
                    'filter' => [
                        'field' => 'uid',
                        'name table' => 'users_field_data',
                        'name field' => 'name',
                        'id' => 'comment_user_uid',
                        'entity_type' => $entity_type_id,
                        'entity_id' => $entity_type->getKey('id'),
                    ],
                ];
                foreach ($fields as $field_name => $field) {
                    $data[$base_table][$field_name . '_cid'] = [
                        'title' => t('Comments of the @entity_type using field: @field_name', $args + [
                            '@field_name' => $field_name,
                        ]),
                        'help' => t('Relate all comments on the @entity_type. This will create 1 duplicate record for every comment. Usually if you need this it is better to create a comment view.', $args),
                        'relationship' => [
                            'group' => t('Comment'),
                            'label' => t('Comments'),
                            'base' => 'comment_field_data',
                            'base field' => 'entity_id',
                            'relationship field' => $entity_type->getKey('id'),
                            'id' => 'standard',
                            'extra' => [
                                [
                                    'field' => 'entity_type',
                                    'value' => $entity_type_id,
                                ],
                                [
                                    'field' => 'field_name',
                                    'value' => $field_name,
                                ],
                            ],
                        ],
                    ];
                }
            }
        }
    }

}