package main

import (
	"embed"
	"flag"
	"fmt"
	"io/fs"
	"log"
	"net/http"
)

// version is set at build time via -ldflags "-X main.version=..."
var version = "dev"

//go:embed static
var staticFiles embed.FS

func main() {
	streamerAddr := flag.String("streamer", "127.0.0.1:44500", "MARTe2 UDP streamer address (host:port)")
	listenAddr := flag.String("listen", ":8080", "HTTP listen address")
	clientPort := flag.Int("clientport", 44900, "Local UDP port to bind for streamer data")
	flag.Parse()

	hub := NewHub()
	go hub.Run()

	udpClient := NewUDPClient(*streamerAddr, *clientPort, hub)
	go udpClient.Run()

	// Serve the embedded static/ directory (index.html, style.css, app.js).
	sub, err := fs.Sub(staticFiles, "static")
	if err != nil {
		log.Fatalf("static sub-fs: %v", err)
	}
	http.Handle("/", http.FileServer(http.FS(sub)))
	http.HandleFunc("/ws", hub.HandleWebSocket)
	http.HandleFunc("/version", func(w http.ResponseWriter, r *http.Request) {
		fmt.Fprint(w, version)
	})

	log.Printf("WebUI listening on %s  (streamer=%s, local UDP port=%d, version=%s)",
		*listenAddr, *streamerAddr, *clientPort, version)
	if err := http.ListenAndServe(*listenAddr, nil); err != nil {
		log.Fatalf("http: %v", err)
	}
}