package http

import (
	"net/http"
	"github.com/spiral/roadrunner/service"
	"context"
	"github.com/spiral/roadrunner"
)

// Name contains default service name.
const Name = "http"

type Middleware interface {
	// Handle must return true if request/response pair is handled withing the middleware.
	Handle(w http.ResponseWriter, r *http.Request) bool
}

// Service manages rr, http servers.
type Service struct {
	middleware []Middleware
	cfg        *Config
	rr         *roadrunner.Server
	handler    *Handler
	http       *http.Server
}

func (s *Service) Add(m Middleware) {
	s.middleware = append(s.middleware, m)
}

// Configure must return configure service and return true if service hasStatus enabled. Must return error in case of
// misconfiguration. Services must not be used without proper configuration pushed first.
func (s *Service) Configure(cfg service.Config, c service.Container) (bool, error) {
	config := &Config{}
	if err := cfg.Unmarshal(config); err != nil {
		return false, err
	}

	if !config.Enable {
		return false, nil
	}

	if err := config.Valid(); err != nil {
		return false, err
	}

	s.cfg = config
	return true, nil
}

// Serve serves the service.
func (s *Service) Serve() error {
	rr := roadrunner.NewServer(s.cfg.Workers)
	if err := rr.Start(); err != nil {
		return err
	}
	defer s.rr.Stop()

	// todo: observer

	s.rr = rr
	s.handler = &Handler{cfg: s.cfg, rr: s.rr}
	s.http = &http.Server{Addr: s.cfg.httpAddr(), Handler: s}

	if err := s.http.ListenAndServe(); err != nil {
		return err
	}

	return nil
}

// Stop stops the service.
func (s *Service) Stop() {
	s.http.Shutdown(context.Background())
}

// Handle handles connection using set of middleware and rr PSR-7 server.
func (s *Service) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	for _, m := range s.middleware {
		if m.Handle(w, r) {
			return
		}
	}

	s.handler.Handle(w, r)
}