package adapter

import (
	"context"
	"encoding/hex"
	"net"
	"net/netip"
	"strings"
	"time"

	C "github.com/sagernet/sing-box/constant"
	"github.com/sagernet/sing-tun"
	"github.com/sagernet/sing/common/control"
)

type NetworkManager interface {
	Lifecycle
	Initialize(ruleSets []RuleSet)
	InterfaceFinder() control.InterfaceFinder
	UpdateInterfaces() error
	DefaultNetworkInterface() *NetworkInterface
	NetworkInterfaces() []NetworkInterface
	NetworkEnvironment() uint64
	AutoDetectInterface() bool
	AutoDetectInterfaceFunc() control.Func
	ProtectFunc() control.Func
	DefaultOptions() NetworkOptions
	RegisterAutoRedirectOutputMark(mark uint32) error
	AutoRedirectOutputMark() uint32
	AutoRedirectOutputMarkFunc() control.Func
	NetworkMonitor() tun.NetworkUpdateMonitor
	InterfaceMonitor() tun.DefaultInterfaceMonitor
	PackageManager() tun.PackageManager
	NeedWIFIState() bool
	WIFIState() WIFIState
	UpdateWIFIState(ctx context.Context)
	ResetNetwork(ctx context.Context)
}

type NetworkOptions struct {
	BindInterface        string
	RoutingMark          uint32
	DomainResolver       string
	DomainResolveOptions DNSQueryOptions
	NetworkStrategy      *C.NetworkStrategy
	NetworkType          []C.InterfaceType
	FallbackNetworkType  []C.InterfaceType
	FallbackDelay        time.Duration
}

type InterfaceUpdateListener interface {
	InterfaceUpdated(ctx context.Context)
}

type WIFIState struct {
	SSID  string
	BSSID string
}

func NormalizeWIFIBSSID(bssid string) string {
	bssid = strings.TrimSpace(bssid)
	if bssid == "" {
		return ""
	}
	parsed, err := net.ParseMAC(bssid)
	if err == nil && len(parsed) == 6 {
		return parsed.String()
	}
	if len(bssid) == 12 {
		decoded, err := hex.DecodeString(bssid)
		if err == nil {
			return net.HardwareAddr(decoded).String()
		}
	}
	return bssid
}

type NetworkInterface struct {
	control.Interface
	Type        C.InterfaceType
	DNSServers  []string
	Gateways    []netip.Addr
	Expensive   bool
	Constrained bool
}