package handlers

import (
	"encoding/json"
	"net"
	"net/http"
	"slideshowApp/env"
)

// Helper to get the local network IP address
func GetLocalIP() string {
	if env.Host.GetValue() != "0.0.0.0" && env.Host.GetValue() != "localhost" {
		return env.Host.GetValue()
	}

	if ip := getActiveIP(); ip != "" {
		return ip
	}
	return "localhost"
}

func getActiveIP() string {
	conn, err := net.Dial("udp", "8.8.8.8:80")
	if err != nil {
		return ""
	}
	defer conn.Close()

	addr := conn.LocalAddr()
	if udpAddr, ok := addr.(*net.UDPAddr); ok {
		return udpAddr.IP.String()
	}
	return ""
}

func InfoHandler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	data := map[string]string{
		"ip":    GetLocalIP(),
		"port":  env.Port.GetValue(),
		"speed": GetInterval(),
	}
	err := json.NewEncoder(w).Encode(data)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
}