// Package router provides a reusable router implementation.
package router

import "log"
import "net"
// import "errors"
import "net/http"
import "hnakra/protocol"
import "hnakra/router/mux"
import "hnakra/router/config"

type Router struct {
	config   config.Config
	http     *mux.HTTP
	services map[*Service] struct { }
}

func New (config config.Config) *Router {
	router := &Router {
		config:   config,
		http:     mux.NewHTTP(config),
		services: make(map[*Service] struct { }),
	}
	return router
}

func (router *Router) HTTPMux () *mux.HTTP {
	return router.http
}

func (router *Router) Accept (conn net.Conn) {
	router.newService(conn)
}

func (router *Router) ServeHTTP (res http.ResponseWriter, req *http.Request) {
	log.Println("->?", req.RemoteAddr, "requests", req.URL.String())
	router.http.ServeHTTP(res, req)
}

// TODO: uniquely identify connected services by an ID

func (router *Router) Service (name string) *Service {
	for service := range router.services {
		if service.Name() == name {
			return service
		}
	}
	return nil
}

func (router *Router) OverServices (callback func (service *Service) bool) {
	for service := range router.services {
		if !callback(service) { break }
	}
}

func (router *Router) list (service *Service) {
	router.services[service] = struct { } { }
}

func (router *Router) unlist (service *Service) {
	delete(router.services, service)
}

func (router *Router) Validate (name string, key []byte, scheme, host, path string) protocol.Status {
	user := router.config.User(name)
	if user == nil || !user.Validate(key) {
		return protocol.StatusBadCredentials
	}
	if !user.CanMountOn(scheme, host, path) {
		return protocol.StatusBadMount
	}
	return protocol.StatusOk
}

func FormatPattern (scheme, host, path string) string {
	return scheme + "://" + host + path
}