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 {
	addrs, err := net.InterfaceAddrs()
	if err != nil {
		return ""
	}

	for _, address := range addrs {
		if ipnet, ok := address.(*net.IPNet); ok && !ipnet.IP.IsLoopback() {

			if ipnet.IP.To4() != nil {
				ipStr := ipnet.IP.String()

				if ipnet.IP.IsLinkLocalUnicast() {
					continue
				}

				return ipStr
			}
		}
	}
	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
	}
}