package service

import (
	"fmt"
	"regexp"
	"spend-sparrow/internal/core"
)

const (
	DECIMALS_MULTIPLIER = 100
)

var (
	safeInputRegex = regexp.MustCompile(`^[a-zA-Z0-9ÄÖÜäöüß,&'". \-\?]+$`)
)

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