// Command webui is a tiny static file server for the StreamHub browser SPA.
//
// It serves the existing Client/udpstreamer/static directory; the SPA talks
// WebSocket directly to the C++ StreamHub (pass ?hub=host:8090 in the URL).
//
// Usage:
//
//	webui -addr :8080 -static ../udpstreamer/static
package main

import (
	"flag"
	"fmt"
	"log"
	"net/http"
)

var buildVersion = "streamhub-webui-dev"

func main() {
	addr := flag.String("addr", ":8080", "HTTP listen address")
	static := flag.String("static", "../udpstreamer/static", "directory with the SPA files")
	hub := flag.String("hub", "localhost:8090", "StreamHub WebSocket host:port the SPA should connect to")
	flag.Parse()

	http.Handle("/", http.FileServer(http.Dir(*static)))
	http.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, buildVersion)
	})
	// The SPA fetches /hub at startup to discover the StreamHub address, so
	// plain http://localhost:8080/ works without a ?hub= query parameter.
	http.HandleFunc("/hub", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, *hub)
	})

	log.Printf("StreamHub WebUI listening on %s (static=%s, hub=%s)", *addr, *static, *hub)
	log.Printf("open http://localhost%s/", *addr)
	if err := http.ListenAndServe(*addr, nil); err != nil {
		log.Fatalf("http: %v", err)
	}
}