// Package server.
package server

import (
	"fmt"
	"net"
	"net/http"
	"time"

	"github.com/abbot/go-http-auth"

	"github.com/gen2brain/cam2ip/handlers"
)

// Server struct.
type Server struct {
	Name    string
	Version string

	Index  int
	Device string
	Delay  int

	Width  float64
	Height float64

	Quality int
	Rotate  int
	Flip    string

	NoWebGL bool

	Timestamp  bool
	TimeFormat string

	Bind     string
	Htpasswd string

	Lazy bool
	Open func() (handlers.ImageReader, error)
}

// NewServer returns new Server.
func NewServer() *Server {
	s := &Server{}

	return s
}

// ListenAndServe listens on the TCP address and serves requests.
func (s *Server) ListenAndServe() error {
	var basic *auth.BasicAuth
	if s.Htpasswd != "" {
		realm := fmt.Sprintf("%s/%s", s.Name, s.Version)
		basic = auth.NewBasicAuthenticator(realm, auth.HtpasswdFileProvider(s.Htpasswd))
	}

	stream := handlers.NewStream(s.Open, s.Delay, s.Quality, s.Lazy)

	mux := http.NewServeMux()

	mux.Handle("/html", newAuthHandler(handlers.NewHTML(s.Width, s.Height, s.NoWebGL), basic))
	mux.Handle("/jpeg", newAuthHandler(handlers.NewJPEG(stream), basic))
	mux.Handle("/mjpeg", newAuthHandler(handlers.NewMJPEG(stream), basic))
	mux.Handle("/socket", newAuthHandler(handlers.NewSocket(stream), basic))

	mux.HandleFunc("/favicon.ico", func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mux.Handle("/", newAuthHandler(handlers.NewIndex(), basic))

	srv := &http.Server{
		Handler:           mux,
		ReadHeaderTimeout: 5 * time.Second,
	}

	listener, err := net.Listen("tcp", s.Bind)
	if err != nil {
		return err
	}

	return srv.Serve(listener)
}

// newAuthHandler wraps handler and checks auth.
func newAuthHandler(handler http.Handler, authenticator *auth.BasicAuth) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if authenticator != nil {
			w.Header().Set("WWW-Authenticate", fmt.Sprintf("Basic realm=\"%s\"", authenticator.Realm))
			if authenticator.CheckAuth(r) == "" {
				http.Error(w, "401 Unauthorized", http.StatusUnauthorized)

				return
			}
		}

		handler.ServeHTTP(w, r)
	})
}