package generate

import (
	"crypto/rand"
	"encoding/binary"
	"encoding/hex"
	"strings"
	"time"
)

// ID generates a 24 character hex string from 8 bytes of current time
// in ns and 4 bytes of crypto-random. In practical terms, that makes
// them orderable.
func ID() string {
	bytes := make([]byte, 12)
	binary.BigEndian.PutUint64(bytes, uint64(time.Now().UnixNano()))
	rand.Read(bytes[8:])

	return strings.ToLower(hex.EncodeToString(bytes))
}

// SessionID generates a 48 character hex string with crypto/rand
func SessionID() string {
	bytes := make([]byte, 24)
	rand.Read(bytes)

	return strings.ToLower(hex.EncodeToString(bytes))
}