//                           UNCLASSIFIED
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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
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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UNPUBLISHED WORK - COPYRIGHT RAYTHEON COMPANY.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.Threading;

namespace Raytheon.Common
{
   /// <summary>
   /// Base class for handling incoming messages
   /// </summary>
   public abstract class MsgDevice : IDisposable
   {
      /// <summary>
      /// A callback def for a completed message
      /// </summary>
      /// <param name="msgId"></param>
      /// <param name="pData"></param>
      /// <param name="numBytes"></param>
      /// <param name="errorCode"></param>
      unsafe public delegate void CompleteMessageCallback(uint msgId, IntPtr pData, uint numBytes, uint errorCode);

      private DataBuffer _dataBuffer;
      private AutoResetEvent _dataInBufferEvent;
      private IWorkerInterface _msgProcessorWorker;
      private bool _isProcessorThreadRunning;
      private Thread _msgProcessorThread;

      /// <summary>
      /// The constructor
      /// </summary>
      /// <param name="msgParser"></param>
      /// <param name="bufferSize"></param>
      public MsgDevice(IMsgParser msgParser, uint bufferSize)
      {
         try
         {
            _isProcessorThreadRunning = false;
            _dataBuffer = new DataBuffer(bufferSize);
            _dataInBufferEvent = new AutoResetEvent(false);
            _msgProcessorWorker = new MsgProcessorWorker(msgParser, ref _dataBuffer, ref _dataInBufferEvent);
            _msgProcessorThread = new Thread(_msgProcessorWorker.DoWork);
         }
         catch (Exception)
         {
            throw;
         }
      }

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

      /// <summary>
      /// The public dispose function. Necessary for commanding threads to quit
      /// </summary>
      public void Dispose()
      {
         Dispose(true);

         GC.SuppressFinalize(this);
      }

      /// <summary>
      /// Add data to the buffer
      /// </summary>
      /// <param name="data">The data to add</param>
      /// <param name="numBytes">the number of bytes to add</param>
      protected void AddToBuffer(byte[] data, uint numBytes)
      {
         try
         {
            _dataBuffer.Add(data, numBytes);

            _dataInBufferEvent.Set();
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// Clear all data from the buffer
      /// </summary>
      protected void ClearBuffer()
      {
         try
         {
            _dataBuffer.RemoveAll();
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// The local dispose function. Necessary for commanding threads to quit
      /// </summary>
      /// <param name="disposing"></param>
      protected virtual void Dispose(bool disposing)
      {
         if (disposing)
         {
            _msgProcessorWorker.QuitWork();

            Thread.Sleep(500);

            _msgProcessorThread.Abort();

            if (_msgProcessorThread.IsAlive)
            {
               _msgProcessorThread.Join();
            }

            _dataInBufferEvent.Dispose();

            _msgProcessorWorker.Dispose();

            _dataBuffer.Dispose();
         }
      }

      /// <summary>
      /// Run the message processor thread
      /// </summary>
      protected void RunThread()
      {
         try
         {
            _msgProcessorThread.Start();
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// Set the callback that will be invoked when a complete message is parsed out
      /// </summary>
      /// <param name="callback">The callback function</param>
      protected void SetCompleteMessageCallback(CompleteMessageCallback callback)
      {
         try
         {
            ((MsgProcessorWorker)_msgProcessorWorker).SetCallback(callback);

            // now that the callback is set, we can run the thread
            if (_isProcessorThreadRunning == false)
            {
               _msgProcessorThread.Start();
               _isProcessorThreadRunning = true;
            }
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// Stop the message processor thread
      /// </summary>
      protected void QuitThread()
      {
         try
         {
            _msgProcessorWorker.QuitWork();

            if (_msgProcessorThread.IsAlive)
            {
               _msgProcessorThread.Join();
            }
         }
         catch (Exception)
         {
            throw;
         }
      }

      /// <summary>
      /// abstract function for the children to implement
      /// </summary>
      /// <param name="data">The data to add</param>
      /// <param name="numBytes">The number of bytes to add</param>
      public abstract void AddData(byte[] data, uint numBytes);
   }
}