package myth

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"
	"syscall"
	"time"

	"golang.org/x/net/http2"
)

var (
	readTimeout  = 30 * time.Second
	writeTimeout = 30 * time.Second
)

func newServe(addr string, router http.Handler) *http.Server {
	return &http.Server{
		Addr:           addr,
		Handler:        router,
		ReadTimeout:    readTimeout,
		WriteTimeout:   writeTimeout,
		MaxHeaderBytes: MB,
	}
}

func run(useV2 bool, addr, certFile, keyFile string, router http.Handler) {
	s := newServe(addr, router)
	if useV2 {
		http2.VerboseLogs = false
		http2.ConfigureServer(s, nil)
	}
	errc := make(chan error)
	go func() {
		c := make(chan os.Signal)
		signal.Notify(c, syscall.SIGINT, syscall.SIGTERM)
		errc <- fmt.Errorf("%s", <-c)
	}()

	go func() {
		log.Println("HTTP Server listen on", addr)
		if len(certFile) > 0 && len(keyFile) > 0 {
			errc <- s.ListenAndServeTLS(certFile, keyFile)
		} else {
			errc <- s.ListenAndServe()
		}

		log.Println("Exit HTTP server", "Quit")
	}()
	log.Println("Exit", <-errc)
}

// ListenAndServe new server and start
func ListenAndServe(addr string, router http.Handler) {
	run(false, addr, ``, ``, router)
}

// ListenAndServeTLS new server and start
func ListenAndServeTLS(addr, certFile, keyFile string, router http.Handler) {
	run(false, addr, certFile, keyFile, router)
}

// ListenAndServeV2 new http2 server and start
func ListenAndServeV2(addr string, router http.Handler) {
	run(true, addr, ``, ``, router)
}

// ListenAndServeTLSV2 new http2 server and start
func ListenAndServeTLSV2(addr, certFile, keyFile string, router http.Handler) {
	run(true, addr, certFile, keyFile, router)
}