package token

import (
	crand "crypto/rand"
	"math/rand"
	"time"
)

// Generate returns an alphanumeric token of specified length
func Generate(length int) string {
	rng := RNG()
	var chars = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
	b := make([]rune, length)
	for i := range b {
		b[i] = chars[rng.Intn(len(chars))]
	}
	return string(b)
}

// RNG returns a new RNG generator
func RNG() *rand.Rand {
	return rand.New(rand.NewSource(time.Now().UnixNano()))
}

// RandBytes returns x random bytes
func RandBytes(x int) []byte {
	y := make([]byte, x)
	crand.Read(y)
	return y
}