package adapter

import (
	"context"
	"net"
	"net/netip"

	"github.com/sagernet/sing-box/common/geoip"
	"github.com/sagernet/sing-dns"
	"github.com/sagernet/sing-tun"
	"github.com/sagernet/sing/common/control"
	N "github.com/sagernet/sing/common/network"

	mdns "github.com/miekg/dns"
)

type Router interface {
	Service

	Outbounds() []Outbound
	Outbound(tag string) (Outbound, bool)
	DefaultOutbound(network string) Outbound

	RouteConnection(ctx context.Context, conn net.Conn, metadata InboundContext) error
	RoutePacketConnection(ctx context.Context, conn N.PacketConn, metadata InboundContext) error
	RouteIPConnection(ctx context.Context, conn tun.RouteContext, metadata InboundContext) tun.RouteAction

	NatRequired(outbound string) bool

	GeoIPReader() *geoip.Reader
	LoadGeosite(code string) (Rule, error)

	Exchange(ctx context.Context, message *mdns.Msg) (*mdns.Msg, error)
	Lookup(ctx context.Context, domain string, strategy dns.DomainStrategy) ([]netip.Addr, error)
	LookupDefault(ctx context.Context, domain string) ([]netip.Addr, error)

	InterfaceFinder() control.InterfaceFinder
	DefaultInterface() string
	AutoDetectInterface() bool
	AutoDetectInterfaceFunc() control.Func
	DefaultMark() int
	NetworkMonitor() tun.NetworkUpdateMonitor
	InterfaceMonitor() tun.DefaultInterfaceMonitor
	PackageManager() tun.PackageManager

	Rules() []Rule
	IPRules() []IPRule

	TimeService

	ClashServer() ClashServer
	SetClashServer(server ClashServer)

	V2RayServer() V2RayServer
	SetV2RayServer(server V2RayServer)
}

type routerContextKey struct{}

func ContextWithRouter(ctx context.Context, router Router) context.Context {
	return context.WithValue(ctx, (*routerContextKey)(nil), router)
}

func RouterFromContext(ctx context.Context) Router {
	metadata := ctx.Value((*routerContextKey)(nil))
	if metadata == nil {
		return nil
	}
	return metadata.(Router)
}

type Rule interface {
	Service
	Type() string
	UpdateGeosite() error
	Match(metadata *InboundContext) bool
	Outbound() string
	String() string
}

type DNSRule interface {
	Rule
	DisableCache() bool
	RewriteTTL() *uint32
}

type IPRule interface {
	Rule
	Action() tun.ActionType
}

type InterfaceUpdateListener interface {
	InterfaceUpdated() error
}