using System;
using System.Collections.Generic;
using System.Net;
using System.Net.NetworkInformation;
using System.Net.Sockets;
using System.Threading;
using UnityEngine;
using Ping = System.Net.NetworkInformation.Ping;

public class MyPing : MonoBehaviour {
  private List<string> ips = new List<string>();

    void Start() {
      GetNetworks();
      Ping_all();
    }

  private void GetNetworks() {
    foreach (var f in NetworkInterface.GetAllNetworkInterfaces()) {
      if (f.OperationalStatus != OperationalStatus.Up) continue;
      foreach (GatewayIPAddressInformation d in f.GetIPProperties().GatewayAddresses) {
        Debug.Log($"IP - {d.Address}");
        ips.Add(d.Address.ToString());
      }
    }
  }

  private void Ping_all() {
    var count = 0;
    foreach (var ip in ips) {
      var array = ip.Split('.');
      if(array.Length < 4) continue;
      for (var i = 1; i <= 254; i++) {
        var ipAddress = array[0] + "." + array[1] + "." + array[2] + "." + i;
        Ping(ipAddress, 1000);
        count++;
      }
    }
    _replying = count;
    Debug.Log("All request send!");
  }

  private void Ping(string host, int timeout) {
    //Debug.Log($"Ping to {host}");

    var buf = new byte[] {1, 2, 3, 4};
    var options = new PingOptions(64, true);
    var ping = new Ping();

    new Thread(delegate ()
    {
      try
      {
        ping.PingCompleted += PingCompleted;
        ping.SendAsync(host, timeout, buf, options, host);
      }
      catch
      {
      }
    }).Start();
  }

  public int _replying;
  private void PingCompleted(object sender, PingCompletedEventArgs e) {
    var ip = (string) e.UserState;
    if (e.Reply != null && e.Reply.Status == IPStatus.Success) {
      var hostname = GetHostName(ip);
      var macaddres = GetMacAddress(ip);
      Debug.Log($"Success! HostName: {hostname}, ip: {ip}, macadres: {macaddres} ");
    } else {
      if(e.Reply != null && e.Reply.Status != IPStatus.TimedOut) Debug.LogWarning(e.Reply.Status.ToString());
      //else Debug.LogWarning($"Null reply from {ip}");
    }

    _replying--;
    if (_replying == 0) Debug.Log("All reply!");
  }

  private string GetHostName(string ipAddress) {
    try {
      var entry = Dns.GetHostEntry(ipAddress);
      return entry.HostName;
    } catch (SocketException e) {
      Debug.LogWarning(e.Message.ToString());
    }

    return null;
  }

  private string GetMacAddress(string ipAddress) {
    var process = new System.Diagnostics.Process {
      StartInfo = {
        FileName = "arp",
        Arguments = "-a " + ipAddress,
        UseShellExecute = false,
        RedirectStandardOutput = true,
        CreateNoWindow = true
      }
    };
    process.Start();
    var strOutput = process.StandardOutput.ReadToEnd();
    var substrings = strOutput.Split('-');
    if (substrings.Length < 8) return "OWN Machine";
    var macAddress = $"{substrings[3].Substring(Math.Max(0, substrings[3].Length - 2))} - {substrings[4]} - {substrings[5]} - {substrings[6]} - {substrings[7]} - {substrings[8].Substring(0, 2)}";
    return macAddress;
  }
}