//go:build linux || freebsd || windows || netbsd || darwin
// +build linux freebsd windows netbsd darwin

package engine

import (
	"net/http"
	"sync"

	"github.com/quic-go/quic-go/http3"
	log "github.com/sirupsen/logrus"
)

var quicEnabled = true

// ListenAndServeQUIC attempts to serve the given http.Handler over QUIC/HTTP3,
// then reports back any errors when done serving.
func (ac *Config) ListenAndServeQUIC(mux http.Handler, mut *sync.Mutex, justServeRegularHTTP chan bool, servingHTTPS *bool) {
	// TODO: Handle ctrl-c by fetching the quicServer struct and passing it to GenerateShutdownFunction.
	//       This can be done once CloseGracefully in h2quic has been implemented:
	//       https://github.com/lucas-clemente/quic-go/blob/master/h2quic/server.go#L257
	// TODO: As far as I can tell, this was never implemented. Look into implementing this for github.com/xyproto/quic
	//
	// gracefulServer.ShutdownInitiated = ac.GenerateShutdownFunction(nil, quicServer)
	if err := http3.ListenAndServe(ac.serverAddr, ac.serverCert, ac.serverKey, mux); err != nil {
		log.Error("Not serving QUIC after all. Error: ", err)
		log.Info("Use the -t flag for serving regular HTTP instead")
		// If QUIC failed (perhaps the key + cert are missing),
		// serve plain HTTP instead
		justServeRegularHTTP <- true
		mut.Lock()
		*servingHTTPS = false
		mut.Unlock()
	}
}