] ) ) {
				$args['admin_filters'] = array();
			}

			// Remove collapsed trigger from admin columns and filters
			if ( ! empty( $args['admin_columns'] ) ) {
				for ( $i = 0; $i < count( $args['admin_columns'] ); $i++ ) {
					if ( isset( $args['admin_columns'][ $i ]['collapsed'] ) ) {
						unset( $args['admin_columns'][ $i ]['collapsed'] );
					}
				}
			}

			if ( ! empty( $args['admin_filters'] ) ) {
				for ( $i = 0; $i < count( $args['admin_filters'] ); $i++ ) {
					if ( isset( $args['admin_filters'][ $i ]['collapsed'] ) ) {
						unset( $args['admin_filters'][ $i ]['collapsed'] );
					}
				}
			}

			/**
			 * @todo Validate meta fields before saving - ensure that used correct types and all names was set.
			 */
			$meta_fields = ! empty( $request['meta_fields'] ) ? $request['meta_fields'] : array();

			$result['slug']        = $slug;
			$result['labels']      = $labels;
			$result['args']        = $args;
			$result['meta_fields'] = $this->sanitize_meta_fields( $meta_fields );

			return $result;

		}

		/**
		 * Filter post type for register
		 *
		 * @return array
		 */
		public function filter_item_for_register( $item ) {

			$result = array();

			$args                = maybe_unserialize( $item['args'] );
			$item['labels']      = maybe_unserialize( $item['labels'] );
			$item['meta_fields'] = maybe_unserialize( $item['meta_fields'] );

			$result = array_merge( $item, $args );

			if ( false !== $result['rewrite'] ) {

				$with_front = isset( $result['with_front'] ) ? $result['with_front'] : true;
				$with_front = filter_var( $with_front, FILTER_VALIDATE_BOOLEAN );

				$result['rewrite'] = array(
					'slug'       => $result['rewrite_slug'],
					'with_front' => $with_front,
				);

				unset( $result['rewrite_slug'] );

			}

			unset( $result['args'] );
			unset( $result['status'] );

			return $result;
		}

		/**
		 * Filter post type for edit
		 *
		 * @return array
		 */
		public function filter_item_for_edit( $item ) {

			$result = array(
				'general_settings'  => array(),
				'labels'            => array(),
				'advanced_settings' => array(),
				'meta_fields'       => array(),
				'admin_columns'     => array(),
				'admin_filters'     => array(),
			);

			$args          = maybe_unserialize( $item['args'] );
			$labels        = maybe_unserialize( $item['labels'] );
			$admin_columns = array();
			$admin_filters = array();
			$name          = ! empty( $labels['name'] ) ? $labels['name'] : '';

			if ( $name ) {
				unset( $labels['name'] );
			}

			if ( ! empty( $args['admin_columns'] ) ) {
				$admin_columns = $args['admin_columns'];
				unset( $args['admin_columns'] );
			}

			if ( ! empty( $args['admin_filters'] ) ) {
				$admin_filters = $args['admin_filters'];
				unset( $args['admin_filters'] );
			}

			$result['general_settings'] = array(
				'name'             => $name,
				'slug'             => $item['slug'],
				'id'               => $item['id'],
				'show_edit_link'   => isset( $args['show_edit_link'] ) ? $args['show_edit_link'] : false,
				'hide_field_names' => isset( $args['hide_field_names'] ) ? $args['hide_field_names'] : false,
				'delete_metadata'  => isset( $args['delete_metadata'] ) ? $args['delete_metadata'] : false,
				'custom_storage'   => isset( $args['custom_storage'] ) ? $args['custom_storage'] : false,
			);

			$meta_fields = array();

			if ( ! empty( $item['meta_fields'] ) ) {

				$meta_fields = maybe_unserialize( $item['meta_fields'] );
				$meta_fields = array_values( $meta_fields );

				if ( jet_engine()->meta_boxes ) {
					$meta_fields = jet_engine()->meta_boxes->data->sanitize_repeater_fields( $meta_fields );
				}

			}

			$admin_columns = ! empty( $admin_columns ) ? array_values( $admin_columns ) : array();
			$admin_filters = ! empty( $admin_filters ) ? array_values( $admin_filters ) : array();

			$with_front         = isset( $args['with_front'] ) ? $args['with_front'] : true;
			$with_front         = filter_var( $with_front, FILTER_VALIDATE_BOOLEAN );
			$args['with_front'] = $with_front;

			if ( ! isset( $args['map_meta_cap'] ) ) {
				$args['map_meta_cap'] = true;
			}

			$result['labels']            = $labels;
			$result['advanced_settings'] = $args;
			$result['meta_fields']       = $meta_fields;
			$result['admin_columns']     = $admin_columns;
			$result['admin_filters']     = $admin_filters;

			return $result;

		}

		/**
		 * Edit built-in post type
		 *
		 * @param  boolean $redirect [description]
		 * @return [type]            [description]
		 */
		public function edit_built_in_item( $redirect = true ) {

			if ( ! current_user_can( 'manage_options' ) ) {
				$this->parent->add_notice(
					'error',
					__( 'You don\'t have permissions to do this', 'jet-engine' )
				);
				return false;
			}

			$item = $this->sanitize_item_from_request( true );

			if ( ! $item ) {
				$this->parent->add_notice(
					'error',
					__( 'Post type name not found in request. Please check your data and try again.', 'jet-engine' )
				);
				return false;
			}

			$this->query_args['status'] = 'built-in';

			$this->before_item_update( $item );

			$id = $this->update_item_in_db( $item );

			$this->after_item_update( $item );

			if ( ! $id ) {
				return false;
			} else {
				return $id;
			}

		}

		/**
		 * Check if current storage table already exists
		 * 
		 * @param  [type]  $item   [description]
		 * @param  boolean $is_new [description]
		 * @return [type]          [description]
		 */
		public function before_item_update( $item = [], $is_new = false ) {

			if ( ! isset( $item['id'] ) ) {
				$is_new = true;
			}

			/**
			 * @todo probably process as hook from \Jet_Engine\CPT\Custom_Tables\Manager class
			 */
			if ( ! empty( $item['args']['custom_storage'] ) ) {

				$db = \Jet_Engine\CPT\Custom_Tables\Manager::instance()->get_db_instance( $item['slug'] );

				if ( $is_new && $db->is_table_exists() ) {
					throw new \Exception( sprintf(
						__( 'You creating a Post Type with "%s" custom storage. But this table already exists in your DB. Please rename your post type.', 'jet-engine' ),
						$db->table()
					) );
				}

				if ( ! $is_new && $db->is_table_exists() ) {

					$id        = $item['id'];
					$prev_item = $this->get_item_for_edit( $id );

					// we changed slug, but table with new slug already exists - so throwing error
					if ( $prev_item 
						&& $prev_item['general_settings']['slug']
						&& $prev_item['general_settings']['slug'] !== $item['slug']
					) {
						throw new \Exception( sprintf(
							__( 'You creating a Post Type with "%s" custom storage. But this table already exists in your DB. Please rename your post type.', 'jet-engine' ),
							$db->table()
						) );
					}

				}

			}

			$this->delete_metadata_on_update( $item );

		}

		/**
		 * Process custom_storagge option after item update
		 * 
		 * @param  [type]  $item   [description]
		 * @param  boolean $is_new [description]
		 * @return [type]          [description]
		 */
		public function after_item_update( $item = [], $is_new = false ) {
			
			if ( ! empty( $item['args']['custom_storage'] ) ) {

				/**
				 * @todo probabaly process as hook from \Jet_Engine\CPT\Custom_Tables\Manager class
				 */
				$fields = ! empty( $item['meta_fields'] ) ? $item['meta_fields'] : [];
				$db     = \Jet_Engine\CPT\Custom_Tables\Manager::instance()->get_db_instance(
					$item['slug'],
					\Jet_Engine\CPT\Custom_Tables\Manager::instance()->prepare_fields( $fields )['as_columns'] ?? array()
				);

				if ( $is_new ) {
					$db->create_table();
				} else {

					if ( ! $db->is_table_exists() ) {
						$db->create_table();
					}

					$db->adjust_fields_to_schema();

				}

			}

		}

		/**
		 * Get built-in post type from data base
		 *
		 * @param  [type] $post_type [description]
		 * @return [type]            [description]
		 */
		public function get_built_in_post_type_from_db( $post_type = null ) {

			$item = $this->db->query(
				$this->table,
				array(
					'slug'   => $post_type,
					'status' => 'built-in',
				),
				array( $this, 'filter_item_for_edit' )
			);

			if ( ! empty( $item ) ) {
				return $item[0];
			} else {
				return false;
			}

		}

		/**
		 * Remove modified data for built-in post type
		 *
		 * @return [type] [description]
		 */
		public function reset_built_in_post_type( $post_type = null ) {

			$this->db->delete(
				$this->table,
				array(
					'slug'   => $post_type,
					'status' => 'built-in',
				),
				array( '%s', '%s' )
			);

			return true;

		}

		/**
		 * Return user-modified built-in post types
		 *
		 * @return [type] [description]
		 */
		public function get_modified_built_in_types() {

			$types = $this->db->query(
				$this->table,
				array(
					'status' => 'built-in',
				)
			);

			if ( ! $types ) {
				return array();
			} else {
				return $types;
			}

		}

		/**
		 * Returns default built-in post type
		 *
		 * @return [type] [description]
		 */
		public function get_default_built_in_post_type( $post_type ) {

			$post_type_object = get_post_type_object( $post_type );

			if ( ! $post_type_object ) {

				$this->parent->add_notice(
					'error',
					__( 'Post type not found', 'jet-engine' )
				);

				return false;
			}

			$post_type_object->labels = (array) $post_type_object->labels;
			$post_type_object         = (array) $post_type_object;

			$_defaults = ! empty( $this->parent->built_in_defaults[ $post_type ] ) ? $this->parent->built_in_defaults[ $post_type ] : false;

			if ( $_defaults ) {
				if ( ! empty( $_defaults['labels'] ) ) {

					$post_type_object['labels'] = array_merge( $post_type_object['labels'], $_defaults['labels'] );

					if ( ! empty( $_defaults['labels']['name'] ) ) {
						$post_type_object['label'] = $_defaults['labels']['name'];
					}

					unset( $_defaults['labels'] );
				}

				if ( ! empty( $_defaults ) ) {
					$post_type_object = array_merge( $post_type_object, $_defaults );
				}

			}

			$post_type_data = array(
				'general_settings' => array(
					'name'             => $post_type_object['label'],
					'slug'             => $post_type_object['name'],
					'custom_storage'   => false,
					'show_edit_link'   => false,
					'hide_field_names' => false,
					'delete_metadata'  => false,
				),
				'labels'        => $post_type_object['labels'],
				'meta_fields'   => array(),
				'admin_columns' => array(),
				'admin_filters' => array(),
			);

			unset( $post_type_object['labels'] );
			unset( $post_type_object['cap'] );
			unset( $post_type_object['label'] );
			unset( $post_type_object['name'] );

			$supports = get_all_post_type_supports( $post_type );
			$supports = array_filter( $supports );
			$supports = array_keys( $supports );

			$post_type_object['supports'] = $supports;

			$post_type_data['advanced_settings'] = $post_type_object;

			return $post_type_data;

		}

		/**
		 * Maybe delete metadata on update item
		 */
		public function delete_metadata_on_update( $item = array() ) {

			$args = ! empty( $item['args'] ) ? $item['args'] : array();

			if ( empty( $args['delete_metadata'] ) ) {
				return;
			}

			if ( empty( $item['id'] ) ) {
				return;
			}

			$prev_item = $this->get_item_for_edit( $item['id'] );

			if ( ! $prev_item ) {
				return;
			}

			$prev_meta_fields = ! empty( $prev_item['meta_fields'] ) ? $prev_item['meta_fields'] : array();
			$new_meta_fields  = ! empty( $item['meta_fields'] ) ? $item['meta_fields'] : array();

			if ( empty( $prev_meta_fields ) ) {
				return;
			}

			$prev_meta_names = wp_list_pluck( $prev_meta_fields, 'name' );
			$new_meta_names  = wp_list_pluck( $new_meta_fields, 'name' );

			$to_delete = array_diff( $prev_meta_names, $new_meta_names );

			if ( empty( $to_delete ) ) {
				return;
			}

			$this->delete_metadata( $prev_item, $to_delete );
		}

		/**
		 * Delete metadata of CPT
		 */
		public function delete_metadata( $item = null, $keys_to_delete = array(), $on_delete = false ) {

			$args = ! empty( $item['general_settings'] ) ? $item['general_settings'] : array();

			if ( $on_delete && empty( $args['delete_metadata'] ) ) {
				return;
			}

			$meta_fields = ! empty( $item['meta_fields'] ) ? $item['meta_fields'] : array();

			if ( empty( $meta_fields ) ) {
				return;
			}

			$meta_names  = wp_list_pluck( $meta_fields, 'name' );
			$meta_fields = array_combine( $meta_names, $meta_fields );

			if ( $on_delete ) {
				$keys_to_delete = $meta_names;
			}

			$to_delete = array_filter( $keys_to_delete, function ( $name ) use ( $meta_fields ) {

				if ( ! empty( $meta_fields[ $name ]['object_type'] ) && 'field' !== $meta_fields[ $name ]['object_type'] ) {
					return false;
				}

				if ( ! empty( $meta_fields[ $name ]['type'] ) && 'html' === $meta_fields[ $name ]['type'] ) {
					return false;
				}

				return true;
			} );

			if ( empty( $to_delete ) ) {
				return;
			}

			Jet_Engine_Tools::delete_metadata_by_object_where(
				'post',
				$to_delete,
				array(
					'post_type' => $args['slug'],
				)
			);

		}

	}

}