//                           UNCLASSIFIED
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UNPUBLISHED WORK - COPYRIGHT RAYTHEON COMPANY.
-------------------------------------------------------------------------*/

using System;
using System.Text;
using NLog;
using Pickering.Pipx40.Interop;
using Raytheon.Common;

namespace Raytheon.Instruments
{
   /// <summary>
   /// A Pickering implementation of the IRelaySwitch interface
   /// </summary>
   public class SwitchPickeringPipx40 : ISwitch
   {
      #region PrivateMemberVariables
      private readonly int _handle;
      private string _name;
      private readonly int _subUnit;
      private State _state;
      private SelfTestResult _selfTestResult;

      private readonly ILogger _logger;

      private readonly IConfigurationManager _configurationManager;
      private readonly IConfiguration _configuration;

      #endregion

      #region PrivateFunctions

      /// <summary>
      /// Dispose of the resources contained by this object
      /// </summary>
      /// <param name="disposing"></param>
      protected virtual void Dispose(bool disposing)
      {
         if (disposing)
         {
            if (_state == State.Ready)
            {
               RelayOpenAll();
               Pickering.Pipx40.Interop.Pipx40Module.Reset(_handle);
               Pickering.Pipx40.Interop.Pipx40Module.Close(_handle);
               _state = State.Uninitialized;
            }
         }
      }

      /// <summary>
      /// Close a single relay
      /// The relay string should be the string form of an integer that represents the bit to close
      /// </summary>
      /// <param name="relay">The relay to close</param>
      private void RelayClose(string relay)
      {
         //VI_ON energizes
         int ret = Pickering.Pipx40.Interop.Pipx40Module.SetChannelState(_handle, _subUnit, Convert.ToInt32(relay), 1);
         //pipx40_operateSwitch
         if (ret != 0)
         {
            throw new Exception("Pickering.Pipx40.Interop.Pipx40Module.SetChannelState() return: " + ret.ToString());
         }
      }

      /// <summary>
      /// Opens a single relay
      /// The relay strings should be the string form of an integer that represents the bit to close
      /// </summary>
      /// <param name="relay">The relay to open</param>
      private void RelayOpen(string relay)
      {
         //VI_OFF energizes
         int ret = Pickering.Pipx40.Interop.Pipx40Module.SetChannelState(_handle, _subUnit, Convert.ToInt32(relay), 0);
         //pipx40_operateSwitch
         if (ret != 0)
         {
            throw new Exception("Pickering.Pipx40.Interop.Pipx40Module.SetChannelState() return: " + ret.ToString());
         }
      }

      /// <summary>
      /// Opens all relays on the card
      /// </summary>
      private void RelayOpenAll()
      {
         Pickering.Pipx40.Interop.Pipx40Module.ClearCard(_handle);

         //Pickering.Pipx40.Interop.Pipx40Module.ClearSub(_handle, _subUnit);
      }

      private void SelfTest()
      {
         SelftestFault stFault = new SelftestFault();

         StringBuilder message = new StringBuilder();

         int ret = Pickering.Pipx40.Interop.Pipx40Module.SelfTest(_handle, ref stFault, message);

         if (ret != 0)
         {
            throw new Exception("Pickering.Pipx40.Interop.Pipx40Module.SelfTest() return: " + ret.ToString() + ", " + message.ToString());
         }
      }

      #endregion

      #region PublicFunctions

      /// <summary>
      /// SwitchPickeringPipx40 factory constructor
      /// </summary>
      /// <param name="deviceName"></param>
      /// <param name="configurationManager"></param>
      public SwitchPickeringPipx40(string deviceName, IConfigurationManager configurationManager)
      {
         Name = deviceName;

         _logger = LogManager.GetLogger($"{this.GetType().Name} - {deviceName}");

         _configurationManager = configurationManager;
         _configuration = _configurationManager.GetConfiguration(Name);

         _subUnit = _configuration.GetConfigurationValue("SwitchPickeringPipx40", "SubUnit", 0);

         int ret = Pipx40Module.Init(Name, 0, 1, ref _handle);
         if (ret != 0)
         {
            throw new Exception("Pickering.Pipx40.Interop.Pipx40Module.Init() return: " + ret.ToString());
         }

         _state = State.Uninitialized;
         _selfTestResult = SelfTestResult.Unknown;
      }

      /// <summary>
      /// 
      /// </summary>
      /// <param name="deviceName"></param>
      /// <param name="address"></param>
      /// <param name="subUnit"></param>
      public SwitchPickeringPipx40(string deviceName, string address, int subUnit)
      {
         _name = deviceName;
         _logger = LogManager.GetLogger($"{this.GetType().Name} - {deviceName}");
         _subUnit = subUnit;

         int ret = Pipx40Module.Init(deviceName, 0, 1, ref _handle);
         if (ret != 0)
         {
            throw new Exception("Pickering.Pipx40.Interop.Pipx40Module.Init() return: " + ret.ToString());
         }

         _state = State.Uninitialized;
         _selfTestResult = SelfTestResult.Unknown;
      }

      /// <summary>
      /// The Finalizer
      /// </summary>
      ~SwitchPickeringPipx40()
      {
         Dispose(false);
      }

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

      /// <summary>
      /// 
      /// </summary>
      /// <param name="path"></param>
      public void Connect(string path)
      {
         RelayClose(path);
      }

      /// <summary>
      /// 
      /// </summary>
      /// <param name="path"></param>
      public void Disconnect(string path)
      {
         RelayOpen(path);
      }

      /// <summary>
      /// 
      /// </summary>
      public void DisconnectAll()
      {
         RelayOpenAll();
      }

      /// <summary>
      /// Dispose of the resources contained by this object
      /// </summary>
      public void Dispose()
      {
         Dispose(true);

         GC.SuppressFinalize(this);
      }

      /// <summary>
      /// 
      /// </summary>
      public string DetailedStatus
      {
         get
         {
            return "This is a Pickering Switch";
         }
      }

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

         set
         {
            throw new NotImplementedException();
         }
      }

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

         set
         {
            throw new NotImplementedException();
         }
      }

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

      /// <summary>
      /// 
      /// </summary>
      public void Initialize()
      {
         if (_state == State.Uninitialized)
         {
            _state = State.Ready;
         }
         else
         {
            throw new Exception("expected the state to be Uninitialized, state was: " + _state.ToString());
         }
      }

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

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

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

      /// <summary>
      /// 
      /// </summary>
      public void Reset()
      {
         throw new NotImplementedException();
      }

      /// <summary>
      /// 
      /// </summary>
      public SelfTestResult SelfTestResult
      {
         get
         {
            return _selfTestResult;
         }
      }

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

      /// <summary>
      /// 
      /// </summary>
      public void Shutdown()
      {
         if (_state == State.Ready)
         {
            RelayOpenAll();
            Pickering.Pipx40.Interop.Pipx40Module.Reset(_handle);
            Pickering.Pipx40.Interop.Pipx40Module.Close(_handle);
            _state = State.Uninitialized;
         }
      }

      #endregion
   }
}