package node

import (
	"net/netip"
	"sync/atomic"
	"vppn/m"
)

var zeroAddrPort = netip.AddrPort{}

const (
	bufferSize            = 1536
	if_mtu                = 1200
	if_queue_len          = 2048
	controlCipherOverhead = 16
	dataCipherOverhead    = 16
)

type peerRoute struct {
	IP            byte
	Up            bool // True if data can be sent on the route.
	Relay         bool // True if the peer is a relay.
	ControlCipher *controlCipher
	DataCipher    *dataCipher
	RemoteAddr    netip.AddrPort // Remote address if directly connected.
	LocalAddr     netip.AddrPort // Local address as seen by the remote.
	RelayIP       byte           // Non-zero if we should relay.
}

// Configuration for this peer.
var (
	netName    string
	localIP    byte
	localPub   bool
	privateKey []byte
)

// Shared interface for writing.
var _iface *ifWriter

// Shared connection for writing.
var _conn *connWriter

// Counters for sending to each peer.
var sendCounters [256]uint64

// Duplicate checkers for incoming packets.
var dupChecks [256]*dupCheck

// Channels for incoming control packets.
var controlPackets [256]chan controlPacket

// Channels for incoming peer updates from the hub.
var peerUpdates [256]chan *m.Peer

// Global routing table.
var routingTable [256]*atomic.Pointer[peerRoute]