package uid

import (
	"crypto/rand"
	"fmt"
)

func New() string {
	var b [16]byte
	if _, err := rand.Read(b[:]); err != nil {
		panic(err)
	}

	b[6] = (b[6] & 0x0f) | 0x40
	b[8] = (b[8] & 0x3f) | 0x80

	return fmt.Sprintf(
		"%08x-%04x-%04x-%04x-%012x",
		b[0:4],
		b[4:6],
		b[6:8],
		b[8:10],
		b[10:16],
	)
}