package kubernetes

import (
	"crypto/rand"
	"math/big"
)

const charset = "abcdefghijklmnopqrstuvwxyz" +
	"ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

func stringWithCharset(length int, charset string) (string, error) {
	b := make([]byte, length)
	for i := range b {
		idx, err := rand.Int(rand.Reader, big.NewInt(int64(len(charset))))
		if err != nil {
			return "", err
		}
		b[i] = charset[idx.Int64()]
	}
	return string(b), nil
}

// RandomString returns a random string, pulling from a standard alphanumeric charset
// [a-zA-Z0-9]
func RandomString(length int) (string, error) {
	return stringWithCharset(length, charset)
}