using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Text;
using System.Text.Json;
using InnovEnergy.App.SaliMax.DataTypes;
using InnovEnergy.App.SaliMax.Ess;
namespace InnovEnergy.App.SaliMax.MiddlewareClasses;

public static class MiddlewareAgent
{
    public static UdpClient   UdpListener = null!;
    private static IPAddress? _controllerIpAddress;
    
    public static void InitializeCommunicationToMiddleware()
    {
        _controllerIpAddress = FindVpnIp();
        if (Equals(IPAddress.None, _controllerIpAddress))
        {
            Console.WriteLine("There is no VPN interface, exiting...");
        }

        const Int32 udpPort = 9000;
        var endPoint = new IPEndPoint(_controllerIpAddress, udpPort);

        UdpListener = new UdpClient();
        UdpListener.Client.Blocking = false;
        UdpListener.Client.Bind(endPoint);
    }
    
    private static IPAddress FindVpnIp()
    {
        const String interfaceName = "innovenergy";
        
        var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces();
        
        foreach (var networkInterface in networkInterfaces)
        {
            if (networkInterface.Name == interfaceName)
            {
                var ipProps         = networkInterface.GetIPProperties();
                var uniCastIPs      = ipProps.UnicastAddresses;
                var controllerIpAddress = uniCastIPs[0].Address;

                Console.WriteLine("VPN IP is: "+ uniCastIPs[0].Address);
                return controllerIpAddress;
            }
        }

        return IPAddress.None;
    }

    public static Configuration? SetConfigurationFile()
    {
        if (UdpListener.Available > 0)
        {
            IPEndPoint? serverEndpoint = null;

            var replyMessage = "ACK";
            var replyData = Encoding.UTF8.GetBytes(replyMessage);

            var udpMessage = UdpListener.Receive(ref serverEndpoint);
            var message = Encoding.UTF8.GetString(udpMessage);

            Configuration? config = JsonSerializer.Deserialize<Configuration>(message);

            Console.WriteLine($"Received a configuration message: GridSetPoint is " + config.GridSetPoint + ", MinimumSoC is " + config.MinimumSoC + " and ForceCalibrationCharge is " + config.ForceCalibrationCharge);

            // Send the reply to the sender's endpoint
            UdpListener.Send(replyData, replyData.Length, serverEndpoint);
            Console.WriteLine($"Replied to {serverEndpoint}: {replyMessage}");
            return config;
        }

        return null;
    }

}