package auth

import (
	"fmt"
	"time"
)

const (
	// Maximum number of bytes in a username.
	MaxUnameSize = 64

	// Number of bytes in a session ID.
	SessIdSize  = 32
	SessTimeout = 1 * time.Hour
)

// User name.
type Uname string

// Session ID.
type SessId [SessIdSize]byte

func ParseUname(s string) (Uname, error) {
	if len(s) > MaxUnameSize {
		return "", fmt.Errorf("username longer than %d bytes: %q", MaxUnameSize, s)
	}
	return Uname(s), nil
}

func ParseSessId(s string) (SessId, error) {
	if len(s) != SessIdSize {
		return SessId{}, fmt.Errorf("wrong session ID size: %d (want %d): %q", len(s), SessIdSize, s)
	}
	var id SessId
	copy(id[:], s)
	return id, nil
}