package idgen

import (
	"crypto/rand"
	"encoding/base64"
	"math/big"
)

const idChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"

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

func GenerateToken() (string, error) {
	token := make([]byte, 48)
	_, err := rand.Read(token)
	if err != nil {
		return "", err
	}
	return base64.URLEncoding.EncodeToString(token), nil
}