//                           UNCLASSIFIED
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-------------------------------------------------------------------------*/

using NLog;
using Raytheon.Common;
using Raytheon.Units;
using System;
using System.Net.Sockets;
using System.Threading;

namespace Raytheon.Instruments
{
	/// <summary>
	/// A class that provides an interface for controlling simulated power supply systems and their modules.
	/// </summary>
	public class PowerSupplySim : IDCPwr
	{
		#region PublicClassMembers
#pragma warning disable CS0067
		public event EventHandler<OverCurrentEventArgs> OverCurrent;
		public event EventHandler<OverVoltageEventArgs> OverVoltage;
#pragma warning restore

      #endregion

      #region PublicFuctions

      /// <summary>
      /// The constructor for a sim power supply (simulated).
      /// </summary>
      /// <param name="overCurrentProtection">The overcurrent protection setting (Amps).</param>
      /// <param name="overVoltageProtection">The overvoltage protection setting (Volts).</param>
      /// <param name="voltageSetpoint">The voltage setpoint (Volts).</param>
      /// <param name="maxVoltageSetpoint">The max voltage setpoint (Volts).</param>
      /// <param name="minVoltageSetpoint">The min voltage setpoint (Volts).</param>
      /// <param name="moduleNumber">The module number (multiple modules in a system).</param>
      public PowerSupplySim(string name, double overCurrentProtection, double overVoltageProtection, double voltageSetpoint, double maxVoltageSetpoint, double minVoltageSetpoint, double slewRateVoltsPerSecond, int moduleNumber = -1)
      {
         _name = name;
         _logger = LogManager.GetCurrentClassLogger();
         _overCurrentProtection = overCurrentProtection;
         _overVoltageProtection = overVoltageProtection;
         _voltageSetpoint = voltageSetpoint;
         _voltageSetpointInitial = voltageSetpoint;
         _maxVoltageSetpoint = maxVoltageSetpoint;
         _minVoltageSetpoint = minVoltageSetpoint;
         _moduleNumber = moduleNumber;
         _isPowerOn = false;
         _slewRateVoltsPerSecond = slewRateVoltsPerSecond;

         // make sure it is off
         Enabled = false;

         // set up power supply
         OutputVoltage = Voltage.FromVolts(_voltageSetpoint);

         _state = State.Uninitialized;
      }

      /// <summary>
      /// 
      /// </summary>
      /// <returns></returns>
      public bool ClearErrors()
      {
         throw new NotImplementedException();
      }

      /// <summary>
      /// 
      /// </summary>
      public Current CurrentLimit
      {
         get
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            return Current.FromAmps(_overCurrentProtection);
         }

         set
         {
            _overCurrentProtection = value.Amps;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public string DetailedStatus
      {
         get
         {
            return "This is a Sim Power Supply called " + _name;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public bool DisplayEnabled
      {
         get
         {
            throw new NotImplementedException();
         }

         set
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// Dispose of this object's resources.
      /// </summary>
      public void Dispose()
      {
         try
         {
            Dispose(true);

            GC.SuppressFinalize(this);
         }
         catch (Exception)
         {
            try
            {
               //ErrorLogger.Instance().Write(err.Message + "\r\n" + err.StackTrace);
            }
            catch (Exception)
            {
               //Do not rethrow. Exception from error logger that has already been garbage collected
            }
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public bool Enabled
      {
         get
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            return _isPowerOn;
         }

         set
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            if (value == false)
            {

               _isPowerOn = false;
            }
            else
            {
               _isPowerOn = true;
            }
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public bool FrontPanelEnabled
      {
         get
         {
            throw new NotImplementedException();
         }

         set
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// 
      /// </summary>
      /// <returns></returns>
      public double GetSlewRate()
      {
         return _slewRateVoltsPerSecond;
      }

      /// <summary>
      /// 
      /// </summary>
      public bool InhibitEnabled
      {
         get
         {
            throw new NotImplementedException();
         }

         set
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public void Initialize()
      {
         // if we have not yet been initialized, go ahead and create the socket
         if (_state == State.Uninitialized)
         {
            _state = State.Ready;
         }
         else
         {
            throw new Exception("PowerSupplySim::Initialize() - expected the supply " + _name + "  to be Uninitialized, state was: " + _state.ToString());
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public InstrumentMetadata Info
      {
         get
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// Control the power supply internal mechanical relay state
      /// </summary>
      /// <param name="shallWeConnect">True to connect, false to disconnect</param>
      public void MechanicalRelayOutputControl(bool shallWeConnect)
      {
         // nothing to do here
      }

      /// <summary>
      /// 
      /// </summary>
      /// <returns></returns>
      public Current MeasureCurrent()
      {
         return Current.FromAmps(ReadCurrent());
      }

      /// <summary>
      /// 
      /// </summary>
      /// <returns></returns>
      public Voltage MeasureVoltage()
      {
         return Voltage.FromVolts(ReadVoltage());
      }

      /// <summary>
      /// 
      /// </summary>
      public string Name
      {
         get
         {
            return _name;
         }
         set { _name = value; }
      }

      /// <summary>
      /// 
      /// </summary>
      public Voltage OutputVoltage
      {
         get
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            return Voltage.FromVolts(_voltageSetpoint);
         }

         set
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            double volts = value.Volts;

            // do not let host set the voltage out of range, unless it is being set to 0
            if (volts != 0.0)
            {
               if (volts > _maxVoltageSetpoint || volts < _minVoltageSetpoint)
               {
                  throw new Exception("PowerSupplySim::OutputVoltage() - Desired voltage setpoint out of range for supply " + _name + ". Commanded setpoint: " + value.ToString() + ", Max: " + _maxVoltageSetpoint.ToString() + ", Min: " + _minVoltageSetpoint.ToString());
               }
            }

            _voltageSetpoint = volts;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public Voltage OverVoltageProtection
      {
         get
         {
            // a small 10 ms sleep for simulation
            Thread.Sleep(10);

            return Voltage.FromVolts(_overVoltageProtection);
         }

         set
         {
            _overVoltageProtection = value.Volts;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public bool OverVoltageProtectionEnabled
      {
         get
         {
            return true;
         }

         set
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// 
      /// </summary>
      /// <returns></returns>
      public SelfTestResult PerformSelfTest()
      {
         throw new NotImplementedException();
      }

      /// <summary>
      /// Reads the overcurrent and overvoltage protection (simulation).
      /// </summary>
      /// <returns>No Errors (simulated).</returns>
      public int ReadProtectionStatus()
      {
         const int PROTECTION_STATUS = 0;

         // a small 10 ms sleep for simulation
         Thread.Sleep(10);

         return PROTECTION_STATUS;
      }

      /// <summary>
      /// 
      /// </summary>
      public void Reset()
      {
         // nothing to do
      }

      /// <summary>
      /// 
      /// </summary>
      public SelfTestResult SelfTestResult
      {
         get
         {
            throw new NotImplementedException();
         }
      }

      /// <summary>
      /// 
      /// </summary>
      /// <param name="slew"></param>
      /*public void SetSlewRate(double slew)
		{
		   _slew = slew;
		}*/

      /// <summary>
      /// 
      /// </summary>
      public State Status
      {
         get
         {
            return _state;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public void Shutdown()
      {
         if (_state == State.Ready)
         {
            Off();

            Reset();

            _state = State.Uninitialized;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public Voltage VoltageSoftLimit
      {
         get
         {
            return Voltage.FromVolts(_maxVoltageSetpoint);
         }
         set
         {
            throw new NotImplementedException();
         }
      }

      #endregion

      #region PrivateClassMembers

      private string _name;
		private double _overCurrentProtection;
		private double _overVoltageProtection;
		private double _voltageSetpoint;
		private double _voltageSetpointInitial;
		private readonly double _maxVoltageSetpoint;
		private readonly double _minVoltageSetpoint;
		private readonly int _moduleNumber;
		private bool _isPowerOn;
		private double _slewRateVoltsPerSecond;
		private State _state;

		/// <summary>
		/// NLog logger
		/// </summary>
		private readonly ILogger _logger;

		#endregion

		#region PrivateFuctions

		/// <summary>
		/// The finalizer.
		/// </summary>
		~PowerSupplySim()
		{
			Dispose(false);
		}

		/// <summary>
		/// Dispose of this object.
		/// </summary>
		/// <param name="disposing">True = currently disposing, False = not disposing.</param>
		protected virtual void Dispose(bool disposing)
		{
			try
			{
				if (disposing)
				{
					if (_state == State.Ready)
					{
						Off();

						_state = State.Uninitialized;
					}
				}
			}
			catch (Exception)
			{
				try
				{
					//ErrorLogger.Instance().Write(err.Message + "\r\n" + err.StackTrace);
				}
				catch (Exception)
				{
					//Do not rethrow. Exception from error logger that has already been garbage collected
				}
			}
		}

		/// <summary>
		/// Returns this object module number.
		/// </summary>
		/// <returns>The module number.</returns>
		/*public int GetModuleNumber()
		{
		   return _moduleNumber;
		}*/

		/// <summary>
		/// Turn the output off (simulated).
		/// </summary>
		private void Off()
		{
			// a small 10 ms sleep for simulation
			Thread.Sleep(10);

			_isPowerOn = false;
		}

		/// <summary>
		/// Turn the output on (simulated).
		/// </summary>
		private void On()
		{
			// a small 10 ms sleep for simulation
			Thread.Sleep(10);

			_isPowerOn = true;
		}

		/// <summary>
		/// Read the current (simulated).
		/// </summary>
		/// <returns>The current (simulated).</returns>
		private double ReadCurrent()
		{
			// a small 10 ms sleep for simulation
			Thread.Sleep(100);

			double currentToReturn = 0.0;

			if (_isPowerOn)
			{
				double maxCurrent = _overCurrentProtection;
				double minCurrent = _overCurrentProtection - .5;

				Random rnd = new Random();

				double seed = rnd.NextDouble();

				currentToReturn = (seed * (maxCurrent - minCurrent)) + minCurrent;
			}

			return currentToReturn;
		}

		/// <summary>
		/// Read the voltage.
		/// </summary>
		/// <returns>The voltage (simulated).</returns>
		private double ReadVoltage()
		{
			// a small 10 ms sleep for simulation
			Thread.Sleep(100);

			double voltageToReturn = 0.0;

			if (_isPowerOn)
			{
				double maxVoltage = _voltageSetpoint + 1;
				double minVoltage = _voltageSetpoint - 1;

				Random rnd = new Random();

				double seed = rnd.NextDouble();

				voltageToReturn = (seed * (maxVoltage - minVoltage)) + minVoltage;
			}

			return voltageToReturn;
		}

		#endregion

	}
}