package main

import (
	"log"
	"net/http"
	"os"
	"path/filepath"
	"strconv"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	CheckOrigin: func(r *http.Request) bool {
		return true // Note: In production, you'd want to check the origin.
	},
}

// handleWebSocket handles WebSocket requests from the peer.
func handleWebSocket(w http.ResponseWriter, r *http.Request) {
	log.Println("Websocket connection!", r.RemoteAddr)

	conn, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println("Upgrade error:", err)
		return
	}
	defer conn.Close()

	for {
		mt, message, err := conn.ReadMessage()
		if err != nil {
			log.Println("Read error:", err)
			break
		}
		log.Printf("recv: %s", message)
		err = conn.WriteMessage(mt, message)
		if err != nil {
			log.Println("Write error:", err)
			break
		}
	}
}

// LoggingHandler logs requests and delegates them to the underlying handler.
type LoggingHandler struct {
	handler http.Handler
}

func (lh *LoggingHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	log.Printf("Serving file: %s", r.URL.Path)
	lh.handler.ServeHTTP(w, r)
}

// noDirListing wraps an http.FileServer handler to prevent directory listings
func noDirListing(h http.Handler, root string) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		// Serve index.html when root is requested
		if r.URL.Path == "/" {
			http.ServeFile(w, r, filepath.Join(root, "index.html"))
			return
		}

		// Check if the path is a directory
		path := filepath.Join(root, r.URL.Path)
		if info, err := os.Stat(path); err == nil && info.IsDir() {
			http.NotFound(w, r) // Return 404 for directories other than root
			return
		}
		h.ServeHTTP(w, r)
	}
}

func main() {
	dir := "./"
	port := 6789

	addr := ":" + strconv.Itoa(port)
	log.Printf("Starting server on %s", addr)

	// Set up file server and WebSocket endpoint
	fs := http.FileServer(http.Dir(dir))
	// loggingHandler := &LoggingHandler{handler: fs}
	// http.Handle("/", loggingHandler)
	http.Handle("/", noDirListing(fs, dir))

	http.HandleFunc("/ws", handleWebSocket)

	// Configure and start the HTTP server
	server := &http.Server{
		Addr:    addr,
		Handler: nil, // nil uses the default ServeMux, which we configured above
	}

	log.Printf("Server is configured and serving on port %d...", port)
	log.Fatal(server.ListenAndServe())
}