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using System;
using System.Collections.Generic;
using System.Threading;
using NLog;

namespace ProgramLib
{
   /// <summary>
	/// Monitor fatal failure signaled by other threads
	/// </summary>
   internal class FailureMonitorThread : BasicThread
   {
      private enum Events
      {
         GLOBAL_QUIT,
         QUIT,
         FATAL_FAILURE,

         // DO NOT change the name
         // This must be the last member in the enum
         EVENT_TIMED_OUT
      }

      private ILogger _logger;

      /// <summary>
		/// Constructor
		/// </summary>
      public FailureMonitorThread()
      {
         _logger = LogManager.GetCurrentClassLogger();
      }

      /// <summary>
		/// Method that executes on the thread.
		/// </summary>
      protected override void DoWork()
      {
         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is running...");

         try
         {
            Dictionary<Events, EventWaitHandle> eventDict = new Dictionary<Events, EventWaitHandle>();
            eventDict[Events.GLOBAL_QUIT] = Program.Instance().EventManager[EventManager.Events.GLOBAL_QUIT];
            eventDict[Events.QUIT] = _quitEvent;
            eventDict[Events.FATAL_FAILURE] = Program.Instance().EventManager[EventManager.Events.FATAL_FAILURE];
            eventDict[Events.EVENT_TIMED_OUT] = null;

            EventGroup<Events, EventWaitHandle> eventGroup = new EventGroup<Events, EventWaitHandle>(eventDict);

            Events id = eventGroup.WaitAny();

            if (id == Events.FATAL_FAILURE)
            {
               Program.Instance().EventManager[EventManager.Events.GLOBAL_QUIT].Set();

               BasicAction action = new UutPowerOffAction();
               action.Run();

               TestStand.ProgramManager.TerminateTestOnSupportThreadError();
            }
         }
         catch (Exception ex)
         {
            _logger.Error(ex.Message + "\n" + ex.StackTrace);
         }

         _logger?.Debug($"{this.GetType().Name}::{System.Reflection.MethodBase.GetCurrentMethod().Name}() is exiting...");

      }
   }
}