package net

import (
	"net"
	"os"

	"github.com/netbirdio/netbird/client/iface/netstack"

	"github.com/google/uuid"
)

const (
	// NetbirdFwmark is the fwmark value used by Netbird via wireguard
	NetbirdFwmark    = 0x1BD00
	PreroutingFwmark = 0x1BD01

	envDisableCustomRouting = "NB_DISABLE_CUSTOM_ROUTING"
)

// ConnectionID provides a globally unique identifier for network connections.
// It's used to track connections throughout their lifecycle so the close hook can correlate with the dial hook.
type ConnectionID string

type AddHookFunc func(connID ConnectionID, IP net.IP) error
type RemoveHookFunc func(connID ConnectionID) error

// GenerateConnID generates a unique identifier for each connection.
func GenerateConnID() ConnectionID {
	return ConnectionID(uuid.NewString())
}

func CustomRoutingDisabled() bool {
	if netstack.IsEnabled() {
		return true
	}
	return os.Getenv(envDisableCustomRouting) == "true"
}