package webutil

import (
	"errors"
	"net/http"
	"strings"

	"golang.org/x/crypto/acme/autocert"
)

// Serve requests using the given http.Server. If srv.Addr has the format
// `hostname:https`, then use autocert to manage certificates for the domain.
//
// For http on port 80, you can use :http.
func ListenAndServe(srv *http.Server) error {
	if strings.HasSuffix(srv.Addr, ":https") {
		hostname := strings.TrimSuffix(srv.Addr, ":https")
		if len(hostname) == 0 {
			return errors.New("https requires a hostname")
		}
		return srv.Serve(autocert.NewListener(hostname))
	}
	return srv.ListenAndServe()
}