package session

import (
	"encoding/base64"
	"fmt"
	"math/rand"
	"time"

	"badat.dev/maeqtt/v2/mqtt/packets"
)

func init() {
	rand.Seed(time.Now().UnixNano())
}

func genClientID() *string {
	buf := make([]byte, 32)
	_, err := rand.Read(buf)
	if err != nil {
		// I don't think this can actually happen but just in case panic
		panic(fmt.Errorf("Failed to generate a client id, %e", err))
	}
	id := "Client_rand_" + base64.URLEncoding.WithPadding(base64.NoPadding).EncodeToString(buf)
	return &id
}

func (s *Session) Disconnect(code packets.DisconnectReasonCode) {
	// If disconnetion fails that means we are already disconnected, great!
	_ = s.Connection.sendPacket(packets.DisconnectPacket{
		ReasonCode: code,
	})
	_ = s.Connection.close()

	s.onDisconnect()
}


func (s *Session) getFreePacketId() uint16 {
	s.freePacketID += 1
	return s.freePacketID
}