Form::duplicate_comments_for_form( int $form_id )

	protected function duplicate_comments_for_form( $form_id ) {
		if ( ! post_type_supports( $this->manager->get_prefix() . 'form', 'comments' ) ) {
			return;
		}

		$mappings = array();

		$comments = get_comments( array(
			'post_id' => $this->original->ID,
		) );

		foreach ( $comments as $comment ) {
			$comment_data = get_comment( $comment, ARRAY_A );
			$comment_data['comment_post_ID'] = $form_id;

			$old_id = $comment_data['comment_ID'];
			unset( $comment_data['comment_ID'] );

			$new_id = wp_insert_comment( $comment_data );
			$mappings[ $old_id ] = $new_id;
		}

		foreach ( $mappings as $old_id => $new_id ) {
			$comment_data = get_comment( $new_id, ARRAY_A );
			if ( 0 === absint( $comment_data['comment_parent'] ) ) {
				continue;
			}

			if ( ! isset( $mappings[ $comment_data['comment_parent'] ] ) ) {
				continue;
			}

			$comment_data['comment_parent'] = $mappings[ $comment_data['comment_parent'] ];
			wp_update_comment( $comment_data );
		}
	}