package ids

import (
	"crypto/rand"
	"encoding/base32"
	"time"
)

var encoding = base32.NewEncoding("0123456789ABCDEFGHJKMNPQRSTVWXYZ").WithPadding(base32.NoPadding)

func Repository() (string, error) {
	return newID("RP_")
}

func Prompt() (string, error) {
	return newID("PM_")
}

func newID(prefix string) (string, error) {
	value := make([]byte, 16)
	milliseconds := uint64(time.Now().UnixMilli())
	value[0] = byte(milliseconds >> 40)
	value[1] = byte(milliseconds >> 32)
	value[2] = byte(milliseconds >> 24)
	value[3] = byte(milliseconds >> 16)
	value[4] = byte(milliseconds >> 8)
	value[5] = byte(milliseconds)
	if _, err := rand.Read(value[6:]); err != nil {
		return "", err
	}
	return prefix + encoding.EncodeToString(value), nil
}