package transport

import (
	"context"
	"net/url"
)

type Server interface {
	Start(context.Context) error
	Stop(context.Context) error
}

type Endpointer interface {
	Endpoint() (*url.URL, error)
}
type Header interface {
	Get(key string) string
	Set(key string, value string)
	Keys() []string
}
type Transporter interface {
	Kind() Kind
	Endpoint() string
	Operation() string
	RequestHeader() Header
	ReplyHeader() Header
}
type Kind string

func (k Kind) String() string {
	return string(k)
}

const (
	KindGRPC Kind = "grpc"
	KindHTTP Kind = "http"
)

type (
	serverTransportKey struct{}
	clientTransportKey struct{}
)

func NewServerContext(ctx context.Context, tr Transporter) context.Context {
	return context.WithValue(ctx, serverTransportKey{}, tr)
}
func FromServerContext(ctx context.Context) (tr Transporter, ok bool) {
	tr, ok = ctx.Value(serverTransportKey{}).(Transporter)
	return
}
func NewClientContext(ctx context.Context, tr Transporter) context.Context {
	return context.WithValue(ctx, clientTransportKey{}, tr)
}

func FromClientContext(ctx context.Context) (tr Transporter, ok bool) {
	tr, ok = ctx.Value(clientTransportKey{}).(Transporter)
	return
}