=> 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;
	}
}