package ulid

import (
	"crypto/rand"
	"sync"

	"github.com/oklog/ulid/v2"
)

var (
	entropy     *ulid.LockedMonotonicReader
	entropyOnce sync.Once
)

func New() string {
	entropyOnce.Do(func() {
		entropy = &ulid.LockedMonotonicReader{
			MonotonicReader: ulid.Monotonic(rand.Reader, 0),
		}
	})
	return ulid.MustNew(ulid.Now(), entropy).String()
}