package osutils

import (
	"github.com/pkg/errors"
	"unicode"
)

func UuidValidate(uuid string) error {
	if len(uuid) != 36 {
		return errors.New("uuid length not valid")
	}

	for i, r := range uuid {
		switch i {
		case 8, 13, 18, 23:
			if r != '-' {
				return errors.New("uuid separator not valid")
			}
			break
		default:
			if !isLetter(r) && !unicode.IsDigit(r) {
				return errors.Errorf("uuid char on %i not valid", i)
			}
		}
	}

	return nil
}

func isLetter(r rune) bool {
	l := unicode.ToLower(r)
	return (l >= 'a' && l <= 'f')
}