package service

import (
	"context"
	"crypto/tls"
	"fmt"
	"net"
	"net/http"
	"time"

	"mstore/app/handler"
	"mstore/app/logger"
	"mstore/app/router"
)

const protocol = "tcp"

type ServiceParams struct {
	Handler  *handler.Handler
	X509Cert string
	X509Key  string
	Portnum  int64
	Address  string
}

type Service struct {
	hand *handler.Handler
	rout *router.Router
	logg *logger.Logger

	address  string
	portnum  int64
	x509cert []byte
	x509key  []byte

	listen net.Listener
	hsrv   *http.Server
}

func NewService(params *ServiceParams) (*Service, error) {
	var err error
	svc := &Service{
		hand:     params.Handler,
		x509cert: []byte(params.X509Cert),
		x509key:  []byte(params.X509Key),
		portnum:  params.Portnum,
		address:  params.Address,
	}
	svc.logg = logger.NewLogger("service")
	return svc, err
}

func (svc *Service) Build() error {
	var err error
	svc.logg.Infof("Service build ")

	svc.rout = router.NewRouter()
	svc.rout.Get("/v3/api/service/hello", svc.hand.SendHello)

	svc.rout.Head("/v3/api/file/{filepath}", svc.hand.FileExists)
	svc.rout.Put("/v3/api/file/{filepath}", svc.hand.PutFile)
	svc.rout.Get("/v3/api/file/{filepath}", svc.hand.GetFile)
	svc.rout.Delete("/v3/api/file/{filepath}", svc.hand.DeleteFile)
	svc.rout.Get("/v3/api/files/{filepath}", svc.hand.ListFiles)

	selector := svc.rout.Selector()
	for _, item := range selector.Routes {
		svc.logg.Infof("%s\t%s", item.Method, item.RawPath)
	}

	const useTLS = true
	if useTLS {
		tlsCert, err := tls.X509KeyPair(svc.x509cert, svc.x509key)

		if err != nil {
			return err
		}

		tlsConfig := tls.Config{
			Certificates:       []tls.Certificate{tlsCert},
			ClientAuth:         tls.NoClientCert,
			InsecureSkipVerify: true,
		}

		listenAddress := fmt.Sprintf("%s:%d", svc.address, svc.portnum)
		svc.listen, err = tls.Listen(protocol, listenAddress, &tlsConfig)
		if err != nil {
			return err
		}

	} else {
		listenAddress := fmt.Sprintf("%s:%d", svc.address, svc.portnum)
		svc.listen, err = net.Listen(protocol, listenAddress)
		if err != nil {
			return err
		}
	}
	svc.logg.Infof("Service listening at %v", svc.listen.Addr())
	svc.hsrv = &http.Server{
		Handler: svc.rout,
	}
	return err
}

func (svc *Service) Run() error {
	var err error
	svc.logg.Infof("Service run")
	err = svc.hsrv.Serve(svc.listen)
	if err == http.ErrServerClosed {
		svc.logg.Warningf("Service Closed")
		err = nil
	}
	if err != nil {
		return err
	}
	return err
}

func (svc *Service) Stop() {
	if svc.hsrv != nil {
		svc.logg.Infof("Service stop")
		downWaiting := 10 * time.Second
		ctx, cancel := context.WithTimeout(context.Background(), downWaiting)
		defer cancel()
		err := svc.hsrv.Shutdown(ctx)
		if err != nil {
			svc.logg.Errorf("Error service shutdown: %v", err)
		}
	}
}