using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.UpdateServices.Administration;
using Microsoft.UpdateServices.Internal;

namespace WsusNagiosReporter
{
    class Program
    {
        static void Main(string[] args)
        {
            List<Array> listResults = new List<Array>();
           

            IUpdateServer objUpdateServer = AdminProxy.GetUpdateServer();

            ComputerTargetGroupCollection ctc = objUpdateServer.GetComputerTargetGroups();
            foreach (IComputerTargetGroup tg in ctc)
            {
                foreach (IComputerTarget ictTarget in tg.GetComputerTargets(true))
                {
                    String[] strResults = new String[5];

                    strResults[0] = String.Format("[{0}] PROCESS_SERVICE_CHECK_RESULT", UnixTimeStamp());
                    strResults[1] = ictTarget.FullDomainName;
                    strResults[2] = "System - WSUS Reporttime";

                    
                    if (ictTarget.LastReportedStatusTime > DateTime.Now.AddDays(-14))
                    {
                        strResults[3] = "0";
                    }
                    else
                    {
                        strResults[3] = "1";
                    }

                    strResults[4] = ictTarget.LastReportedStatusTime.ToString();
                    listResults.Add(strResults);


                    // Prüfung auf Installierte Updates
                    Int32 UpdatesNeeded = ictTarget.GetUpdateInstallationSummary().NotInstalledCount;
                    Int32 UpdatesFailed = ictTarget.GetUpdateInstallationSummary().FailedCount;
                    Int32 UpdatesInstalled = ictTarget.GetUpdateInstallationSummary().InstalledCount;

                    strResults = new String[5];
                    strResults[0] = String.Format("[{0}] PROCESS_SERVICE_CHECK_RESULT", UnixTimeStamp());
                    strResults[1] = ictTarget.FullDomainName;
                    strResults[2] = "System - WSUS Status";

                    if (UpdatesFailed > 0)
                    {
                        strResults[3] = "2";
                    }
                    else if (UpdatesNeeded > 0)
                    {
                        strResults[3] = "1";
                    }
                    else
                    {
                        strResults[3] = "0";
                    }


                    strResults[4] = String.Format("Needed: {0}, Failed: {1}, Installed: {2}", UpdatesNeeded.ToString(), UpdatesFailed.ToString(), UpdatesInstalled.ToString());

                    listResults.Add(strResults);

                }
            }

            foreach (String[] stringarray in listResults)
            {
                Console.WriteLine(String.Join(";", stringarray));
            }
        }


        static Int32 UnixTimeStamp()
        {
            DateTime dtUnixEpoch = new DateTime(1970, 01, 01, 0, 0, 0);

            TimeSpan Difference = DateTime.UtcNow - dtUnixEpoch;

            return Convert.ToInt32(Difference.TotalSeconds);

        }
    }
}