//                           UNCLASSIFIED
/*-------------------------------------------------------------------------
RAYTHEON PROPRIETARY: THIS DOCUMENT CONTAINS DATA OR INFORMATION
PROPRIETARY TO RAYTHEON COMPANY AND IS RESTRICTED TO USE ONLY BY PERSONS
AUTHORIZED BY RAYTHEON COMPANY IN WRITING TO USE IT. DISCLOSURE TO
UNAUTHORIZED PERSONS WOULD LIKELY CAUSE SUBSTANTIAL COMPETITIVE HARM TO
RAYTHEON COMPANY'S BUSINESS POSITION. NEITHER SAID DOCUMENT NOR ITS
CONTENTS SHALL BE FURNISHED OR DISCLOSED TO OR COPIED OR USED BY PERSONS
OUTSIDE RAYTHEON COMPANY WITHOUT THE EXPRESS WRITTEN APPROVAL OF RAYTHEON
COMPANY.

THIS PROPRIETARY NOTICE IS NOT APPLICABLE IF DELIVERED TO THE U.S.
GOVERNMENT.

UNPUBLISHED WORK - COPYRIGHT RAYTHEON COMPANY.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

using System;
using System.Collections.Generic;
using System.IO;
using NLog;
using Pickering.Lxi.Piplx;
using Raytheon.Common;
using Raytheon.Instruments.GeneralIO;

namespace Raytheon.Instruments
{
   /// <summary>
   /// A class that implements a Pickering DIO card
   /// </summary>
   public class DIOPickering40x : IGeneralIO
   {
      #region PrivateClassMembers
      private string _name;
      private string _lxiIpAddress;
      private int _deviceNum;
      private int _busNum;
      private SelfTestResult _selfTestResult;
      private State _state;
      private object _syncObj = new Object();
      private PiplxCard _dioCard;
      private int _numChannelPerPort = 8;
      private int _channelStartIndex = 0;
      private int _numInputChannels;
      private int _numOutputChannels;
      private bool _shallWeInitializeOutput = false;
      PiplxManager _piplxManager;

      private Dictionary<string, IODatatypes.DIOChannelInfo> _signalNameToChannelInfoMap = new Dictionary<string, IODatatypes.DIOChannelInfo>();

      private readonly ILogger _logger;

      private readonly IConfigurationManager _configurationManager;
      private readonly IConfiguration _configuration;

      #endregion

      #region PublicClassFunctions

      /// <summary>
      /// DIOPickering40x factory constructor
      /// </summary>
      /// <param name="deviceName"></param>
      /// <param name="configurationManager"></param>
      public DIOPickering40x(string deviceName, IConfigurationManager configurationManager)
      {
         Name = deviceName;

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

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

         string dioModuleDefPath = _configuration.GetConfigurationValue(deviceName, ConfigXml.DIO_MODULE_DEF_FILEPATH.ToString());

         if (!Path.IsPathRooted(dioModuleDefPath))
            dioModuleDefPath = Path.GetFullPath(Path.Combine(_configurationManager.ConfigurationStoragePath, dioModuleDefPath));

         IConfigurationFile dioModuleConfig = new ConfigurationFile(dioModuleDefPath);

         _lxiIpAddress = dioModuleConfig.ReadValue(Name, ConfigIni.LXI_IP_ADDRESS.ToString());
         Int32.TryParse(dioModuleConfig.ReadValue(Name, ConfigIni.BUS_NUMBER.ToString()), out _busNum);
         Int32.TryParse(dioModuleConfig.ReadValue(Name, ConfigIni.DEVICE_NUMBER.ToString()), out _deviceNum);

         Boolean.TryParse(dioModuleConfig.ReadValue(Name, ConfigIni.SHALL_WE_DRIVE_OUTPUT_UPON_INITIALIZATION.ToString()), out _shallWeInitializeOutput);

         List<string> outputSignalNames = dioModuleConfig.ReadAllKeys($"{Name}.{ConfigIni.OUTPUT_SIGNALS}");
         List<string> intputSignalNames = dioModuleConfig.ReadAllKeys($"{Name}.{ConfigIni.INPUT_SIGNALS}");

         Int32.TryParse(dioModuleConfig.ReadValue(Name, ConfigIni.NUM_CHANNELS_PER_PORT.ToString()), out _numChannelPerPort);
         Int32.TryParse(dioModuleConfig.ReadValue(Name, ConfigIni.CHANNEL_START_INDEX.ToString()), out _channelStartIndex);

         if (!(_channelStartIndex == 0 || _channelStartIndex == 1))
         {
            throw new Exception($"The value for key {ConfigIni.CHANNEL_START_INDEX.ToString()} in section {Name} must be 0 or 1 in {dioModuleDefPath}");
         }

         IODatatypes.DIOChannelInfo info;
         foreach (string signalName in outputSignalNames)
         {
            if (_signalNameToChannelInfoMap.ContainsKey(signalName))
               throw new Exception($"Key {signalName} in section {Name}.{ConfigIni.OUTPUT_SIGNALS} conflicts with the same key defined in another section.");

            string iniLine = dioModuleConfig.ReadValue($"{Name}.{ConfigIni.OUTPUT_SIGNALS}", signalName);
            string[] infoTokens = iniLine.Split('|');
            if (infoTokens.Length != 2)
            {
               throw new Exception($"Key {signalName} in section {Name}.{ConfigIni.OUTPUT_SIGNALS} does not contain 2 tokens");
            }

            info.channelNumber = Convert.ToUInt32(infoTokens[0]);
            info.ioType = IODatatypes.IOType.DigitalOutput;
            info.initialValue = Convert.ToInt32(infoTokens[1]);

            _signalNameToChannelInfoMap[signalName] = info;
         }

         foreach (string signalName in intputSignalNames)
         {
            if (_signalNameToChannelInfoMap.ContainsKey(signalName))
               throw new Exception($"Key {signalName} in section {Name}.{ConfigIni.INPUT_SIGNALS} conflicts with the same key defined in another section.");

            string iniLine = dioModuleConfig.ReadValue($"{Name}.{ConfigIni.INPUT_SIGNALS}", signalName);

            info.channelNumber = Convert.ToUInt32(iniLine);
            info.ioType = IODatatypes.IOType.DigitalInput;
            info.initialValue = -1;

            _signalNameToChannelInfoMap[signalName] = info;
         }

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

      ~DIOPickering40x()
      {
         if (_dioCard != null)
         {
            _dioCard.Close();
            _piplxManager.Disconnect();
         }
      }

      /// <summary>
      /// Initialize the card
      /// </summary>
      public void Initialize()
      {
         lock (_syncObj)
         {
            if (_state == State.Uninitialized)
            {
               _piplxManager = new PiplxManager(_lxiIpAddress);

               foreach (PiplxCard card in _piplxManager.Cards)
               {
                  PiplxCardInfo info = (PiplxCardInfo)card.Info;

                  if (info.Device == _deviceNum && info.Bus == _busNum)
                  {
                     _dioCard = card;
                     _numInputChannels = info.InputSubunitsCount * _numChannelPerPort;
                     _numOutputChannels = info.OutputSubunitsCount * _numChannelPerPort;

                     _dioCard.Open();

                     break;
                  }
               }

               if (_dioCard == null)
               {
                  throw new Exception($"No DIO card exists in LXI chassis with DEVICE_NUMBER={_deviceNum} and BUS_NUMBER={_busNum}");
               }

               if (_shallWeInitializeOutput)
               {
                  foreach (KeyValuePair<string, IODatatypes.DIOChannelInfo> item in _signalNameToChannelInfoMap)
                  {
                     if (item.Value.initialValue != -1)
                     {
                        SetBit(item.Key, (IODatatypes.BitState)item.Value.initialValue);
                     }
                  }
               }

               _state = State.Ready;
            }
            else
            {
               throw new Exception("Expected the state to be Uninitialized, state was: " + _state.ToString() + " on card " + _name);
            }
         }
      }

      /// <summary>
      /// Return map of all signals
      /// </summary>
      public Dictionary<string, IODatatypes.DIOChannelInfo> GetAllSignals()
      {
         return _signalNameToChannelInfoMap;
      }

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

      /// <summary>
      /// 
      /// </summary>
      public string DetailedStatus
      {
         get
         {
            return "This is a Pickering DIO Card " + _name;
         }
      }

      /// <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>
      /// <param name="signalName"></param>
      /// <param name="state"></param>
      public void SetBit(string signalName, IODatatypes.BitState state)
      {
         lock (_syncObj)
         {
            if (!_signalNameToChannelInfoMap.ContainsKey(signalName))
               throw new Exception($"Signal name {signalName} doesn't exist for card: " + _name);

            if (_signalNameToChannelInfoMap[signalName].channelNumber >= _numOutputChannels || _signalNameToChannelInfoMap[signalName].channelNumber < _channelStartIndex)
            {
               throw new Exception($"The output channel number {_signalNameToChannelInfoMap[signalName].channelNumber} specified must be >= {_channelStartIndex} and < {_numOutputChannels + _channelStartIndex} on card " + _name);
            }

            GetPortIndexAndBitIndex(signalName, out int portIndex, out int bitIndex);

            DigitalInputOutputSubunit subunit = (DigitalInputOutputSubunit)_dioCard.OutputSubunits[portIndex];

            subunit[bitIndex + 1] = state != 0;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      /// <param name="signalName"></param>
      /// <returns></returns>
      public IODatatypes.BitState GetBitState(string signalName)
      {
         lock (_syncObj)
         {
            if (!_signalNameToChannelInfoMap.ContainsKey(signalName))
               throw new Exception($"Signal name {signalName} doesn't exist for card: " + _name);

            if (_signalNameToChannelInfoMap[signalName].channelNumber >= _numInputChannels || _signalNameToChannelInfoMap[signalName].channelNumber < _channelStartIndex)
            {
               throw new Exception($"The input channel number {_signalNameToChannelInfoMap[signalName].channelNumber} specified must be >= {_channelStartIndex} and < {_numInputChannels + _channelStartIndex} on card " + _name);
            }

            GetPortIndexAndBitIndex(signalName, out int portIndex, out int bitIndex);

            DigitalInputOutputSubunit subunit = (DigitalInputOutputSubunit)_dioCard.InputSubunits[portIndex];

            return (IODatatypes.BitState)(subunit[bitIndex + 1] ? 1 : 0);
         }
      }

      /// <summary>
      /// Because the user has to define each channel number in the config file, some people will use 0 or 1 start their starting channel number 
		/// Whether the user prefers 0 or 1 as their starting channel number, this function will then calculate the port index and bit index that the
		/// driver API needs to be able to drive/read the signal
		/// <param name="signalName"></param>
		/// <param name="portIndex">portIndex will range from 0..N</param>
		/// <param name="bitIndex">bitIndex will range from 0..M</param>
      /// </summary>
      private void GetPortIndexAndBitIndex(string signalName, out int portIndex, out int bitIndex)
      {
         portIndex = (int)(Math.Ceiling((double)((int)_signalNameToChannelInfoMap[signalName].channelNumber + Math.Abs(_channelStartIndex - 1)) / (double)_numChannelPerPort) - 1.0);

         int multiplier = ((int)_signalNameToChannelInfoMap[signalName].channelNumber + _numChannelPerPort) / _numChannelPerPort;
         bitIndex = (((int)_signalNameToChannelInfoMap[signalName].channelNumber + _numChannelPerPort) - (_numChannelPerPort * multiplier)) - _channelStartIndex;
         if (bitIndex < 0)
         {
            bitIndex = _numChannelPerPort - 1;
         }
      }

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

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

      /// <summary>
      /// 
      /// </summary>
      public uint NumberOfInputBits
      {
         get
         {
            return (uint)_numInputChannels;
         }
      }

      /// <summary>
      /// 
      /// </summary>
      public uint NumberOfOutputBits
      {
         get
         {
            return (uint)_numOutputChannels;
         }
      }

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

      /// <summary>
      /// 
      /// </summary>
      public void Reset()
      {
         lock (_syncObj)
         {
            Shutdown();
            Initialize();
         }
      }

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

      /// <summary>
      /// 
      /// </summary>
      /// <param name="bit"></param>
      public void SetTristate(string signalName)
      {
         throw new NotImplementedException();
      }

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

      /// <summary>
      /// 
      /// </summary>
      public void Shutdown()
      {
         lock (_syncObj)
         {
            _state = State.Uninitialized;
         }
      }
      #endregion
   }
}