package security

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

func RandomHex(bytes int) (string, error) {
	buf := make([]byte, bytes)
	if _, err := rand.Read(buf); err != nil {
		return "", err
	}
	return hex.EncodeToString(buf), nil
}

func AccountNumber() (string, error) {
	const digits = "0123456789"
	out := make([]byte, 12)
	max := big.NewInt(int64(len(digits)))

	for i := range out {
		n, err := rand.Int(rand.Reader, max)
		if err != nil {
			return "", err
		}
		out[i] = digits[n.Int64()]
	}

	return "GO" + string(out), nil
}