package service

import (
	"fmt"
	"regexp"
)

var (
	safeInputRegex = regexp.MustCompile(`^[a-zA-Z0-9ÄÖÜäöüß -]+$`)
)

func validateString(value string, fieldName string) error {
	if value == "" {
		return fmt.Errorf("field \"%s\" needs to be set: %w", fieldName, ErrBadRequest)
	} else if !safeInputRegex.MatchString(value) {
		return fmt.Errorf("use only letters, dashes and spaces for \"%s\": %w", fieldName, ErrBadRequest)
	} else {
		return nil
	}
}