=> 'info',
			'button_type'                               => '',
			'button_link'                               => '',
			'class'                                     => array(),
			// Input/Textarea
			'maxlength'                                 => null,
			'minlength'                                 => null,
			// Display
			// -------------------------------------------------------------------
			'show_cart_minimum'                         => 0,
			'show_cart_maximun'                         => 0,
			'show_role'                                 => array(),
			'hide_role'                                 => array(),
			'apply_conditions_if_more_than_one_product' => false,
			'show_product'                              => array(),
			'hide_product'                              => array(),
			'show_product_cat'                          => array(),
			'hide_product_cat'                          => array(),
			'show_product_type'                         => array(),
			'hide_product_type'                         => array(),
			'show_product_subtype'                      => '',
			'hide_product_subtype'                      => '',
			'is_downloadable'                           => false,
			'is_virtual'                                => false,
			'hide_account'                              => false,
			'hide_checkout'                             => false,
			'hide_email'                                => false,
			'hide_order'                                => false,
			'hide_invoice'                              => false,
			// Pickers
			// -------------------------------------------------------------------
			'time_format_ampm'                          => true,
			'time_limit_start'                          => null,
			'time_limit_end'                            => null,
			'time_limit_interval'                       => null,
			'date_limit'                                => 'fixed',
			'date_format'                               => 'mm/dd/yy',
			'date_limit_variable_min'                   => -1,
			'date_limit_variable_max'                   => 1,
			'date_limit_fixed_min'                      => gmdate( 'Y-m-d' ),
			'date_limit_fixed_max'                      => gmdate( 'Y-m-d' ),
			'date_limit_days'                           => array(),
			// Price
			// -------------------------------------------------------------------
			'add_price'                                 => false,
			'add_price_name'                            => '',
			'add_price_total'                           => null,
			'add_price_type'                            => 'fixed',
			'add_price_tax'                             => false,
			'extra_class'                               => '',
			// Conditional
			// -------------------------------------------------------------------
			'conditional'                               => false,
			'conditional_parent_key'                    => '',
			'conditional_parent_value'                  => '',
			// State
			// -------------------------------------------------------------------
			'country'                                   => '',
			// Select 2
			// -------------------------------------------------------------------
			'select2'                                   => false,
			'select2_allowclear'                        => false,
			'select2_selectonclose'                     => false,
			'select2_closeonselect'                     => false,
			'select2_search'                            => false,
			// Upload
			// -------------------------------------------------------------------
			'file_limit'                                => 4,
			'file_types'                                => array(),
			'file_max_size'                             => wp_max_upload_size() / 1024,
			// Color
			// -------------------------------------------------------------------
			'pickertype'                                => '',
			// Listing
			// -------------------------------------------------------------------
			'listable'                                  => false,
			'sortable'                                  => false,
			'filterable'                                => false,
			'max'                                       => '',
			'min'                                       => '',
		);
	}

	public function get_defaults() {
		return $this->get_default_fields();
	}

	public function get_default_fields() {
		$fields = array();

		/**
		 * Exclude from form actions to fix issue in myaccount edit billing and shipping form save
		 */
		$form_action = Helpers::get_form_action();

		if ( 'account' !== $form_action && 'additional' !== $this->prefix ) {

			$prefix = sprintf( '%s_', $this->prefix );

			/**
			 * Fix nesting level
			 */
			remove_all_filters( 'woocommerce_' . $prefix . 'fields' );

			$i = 0;
			foreach ( WC()->countries->get_address_fields( '', $prefix ) as $key => $field ) {

				$field['id']   = $i;
				$field['key']  = $key;
				$field['name'] = str_replace( $prefix, '', $key );

				$fields[ $i ] = $field;
				$i++;
			}
		}

		return $fields;
	}

	public function get_fields() {
		// (is_array($fields = $this->get_items())) {

		$fields = $this->get_items();
		if ( count( $fields ) ) {

			foreach ( $fields as $field_id => $field ) {

				$fields[ $field_id ] = apply_filters( 'wooccm_checkout_field_filter', $this->sanitize_field( $field_id, $field, $fields ), $field_id );
			}

			uasort( $fields, array( __CLASS__, 'order_fields' ) );

			$fields = apply_filters( 'wooccm_' . $this->prefix . '_fields', $fields );
		}
		// }

		return $fields;
	}

	public function update_fields( $fields ) {
		if ( is_array( $fields ) ) {

			foreach ( $fields as $field_id => $field ) {
				if ( ! array_key_exists( 'name', $field ) ) {
					return false;
				}
			}

			// reorder array based on ids
			ksort( $fields );

			if ( $this->save_items( $fields ) ) {
				return $fields;
			}
		}

		return false;
	}

	public function delete_fields() {
		$this->delete_checkout_field();
		$this->delete();
		$this->save_items( $this->get_default_fields() );
	}

	protected function delete_checkout_field( $field_id = null ) {

		$fields_data = $this->get_fields();

		if ( null !== $field_id ) {
			foreach ( $fields_data as $field ) {
				if ( $field['id'] == $field_id ) {
					$fields_data = array( $field );
					continue;
				}
			}
		}

		$users = get_users( array( 'fields' => array( 'ID' ) ) );

		foreach ( $users as $user ) {
			foreach ( $fields_data as $field ) {
					delete_user_meta( $user->ID, $field['key'] );
			}
		}
	}

	// Field
	// ---------------------------------------------------------------------------

	public function add_field( $field_data ) {
		return $this->add_item( $field_data );
	}

	public function get_field( $field_id ) {
		return $this->get_item( $field_id );
	}

	public function update_field( $field_data ) {
		return $this->update_item( $field_data );
	}

	public function delete_field( $field_id ) {
		$this->delete_checkout_field( $field_id );
		return $this->delete_item( $field_id );
	}

	// Sanitize
	public function sanitize_field( $field_id, $field, $fields ) {
		$field['id'] = $field_id;

		if ( empty( $field['name'] ) ) {

			$field['name'] = $this->get_name( $field_id );

			if ( $this->duplicated_name( $field['name'], $fields ) ) {
				$field['name'] .= 'b';
			}
		}

		$field['key'] = $this->get_key( $this->prefix, $field['name'] );

		if ( empty( $field['position'] ) && is_array( $field['class'] ) ) {
			$position = array_intersect( (array) $field['class'], array( 'form-row-wide', 'form-row-first', 'form-row-last' ) );
			if ( isset( $position[0] ) ) {
				$field['position'] = $position[0];
			} else {
				$field['position'] = 'form-row-wide';
			}
		}

		if ( empty( $field['order'] ) ) {
			$field['order'] = $field_id + 1;
		}

		if ( ! empty( $field['conditional_parent_key'] ) ) {

			if ( strpos( $field['conditional_parent_key'], $this->prefix ) === false ) {
				$field['conditional_parent_key'] = sprintf( '%s_%s', $this->prefix, $field['conditional_parent_key'] );
			}

			if ( $field['conditional_parent_key'] == $field['key'] ) {
				$field['conditional_parent_key'] = '';
			}
		}

		if ( is_array( $field['options'] ) && count( $field['options'] ) > 1 ) {
			uasort( $field['options'], array( __CLASS__, 'order_fields' ) );
		}

		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash
		$regex = $field['validate_regex'];

		wp_unslash( $field );

		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.MissingUnslash
		$field['validate_regex'] = $regex;

		return $field;
	}
}