using System.Security.Cryptography;
using System.Threading;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NLog;
using NLog.Config;
using NLog.Targets;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;

namespace TimberWinR.TestGenerator
{
    class UdpTestParameters
    {
        public int Port { get; set; }
        public string Host { get; set; }
        public int NumMessages { get; set; }
        public int SleepTimeMilliseconds { get; set; }
        public UdpTestParameters()
        {
            NumMessages = 100;
            Port = 6379;
            Host = "localhost";
            SleepTimeMilliseconds = 1;
        }
    }

    class UdpTestGenerator
    {
        public static int Generate(UdpTestParameters parms)
        {
            var hostName = System.Environment.MachineName + "." +
               Microsoft.Win32.Registry.LocalMachine.OpenSubKey(
                   "SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters").GetValue("Domain", "").ToString();
     
            IPAddress broadcast;
            if (!IPAddress.TryParse(parms.Host, out broadcast))
                broadcast = Dns.GetHostEntry(parms.Host).AddressList[0];

            Socket s = new Socket(broadcast.AddressFamily, SocketType.Dgram, ProtocolType.Udp);

            LogManager.GetCurrentClassLogger().Info("Start UDP Generation");

            for (int i = 0; i < parms.NumMessages; i++)
            {
                JObject o = new JObject
                {
                    {"Application", "udp-generator"},  
                    {"Executable", "VP.Common.SvcFrm.Services.Host, Version=29.7.0.0, Culture=neutral, PublicKeyToken=null"},
                    {"RenderedMessage", "Responding to RequestSchedule message from 10.1.230.36 with Ack because: PRJ byte array is null."},
                    {"Team", "Manufacturing Software"},   
                    {"RecordNumber", i},
                    {"Host", hostName},                   
                    {"UtcTimestamp", DateTime.UtcNow.ToString("o")},
                    {"Type", "VP.Fulfillment.Direct.Initialization.LogWrapper"},                
                    {"Message", "Testgenerator udp message " + DateTime.UtcNow.ToString("o")},
                    {"Index", "logstash"}
                };

                string hashedString = "";
                foreach(var key in o)
                {
                    hashedString += key.ToString();
                }

                var source = ASCIIEncoding.ASCII.GetBytes(hashedString);
                var md5 = new MD5CryptoServiceProvider().ComputeHash(source);
                var hash = string.Concat(md5.Select(x => x.ToString("X2")));

                o["md5"] = hash;

                byte[] sendbuf = Encoding.UTF8.GetBytes(o.ToString(Formatting.None));
                IPEndPoint ep = new IPEndPoint(broadcast, parms.Port);
                s.SendTo(sendbuf, ep);

                if (i % 1000 == 0)
                    LogManager.GetCurrentClassLogger().Info("Sent {0} of {1} messages", i, parms.NumMessages);

                Thread.Sleep(parms.SleepTimeMilliseconds);
            }

            LogManager.GetCurrentClassLogger().Info("Finished UDP Generation");

            return parms.NumMessages;
        }

    }
}