/*
This software is subject to the license described in the License.txt file
included with this software distribution. You may not use this file except
in compliance with this license.

Copyright (c) Dynastream Innovations Inc. 2016
All rights reserved.
*/
#include "types.h"
#if defined(DSI_TYPES_WINDOWS)

#include "dsi_silabs_library.hpp"

#include <memory>

using namespace std;

#define LIBRARY_NAME    "DSI_SiUSBXp_3_1.DLL"

//Static variable initializations
std::auto_ptr<SiLabsLibrary> SiLabsLibrary::clAutoInstance(NULL);
BOOL SiLabsLibrary::bStaticSet = FALSE;

                                                                     //return an auto_ptr?
BOOL SiLabsLibrary::Load(auto_ptr<const SiLabsLibrary>& clAutoLibrary_)  //!!Should we lose the dependency on auto_ptr and just return the pointer (and let the user make their own auto_ptr)?
{
   try
   {
      clAutoLibrary_.reset(new SiLabsLibrary());
   }
   catch(...)
   {
      clAutoLibrary_.reset(NULL);
      return FALSE;
   }

   return TRUE;
}


SiLabsLibrary::SiLabsLibrary() //throw(SiLabsError::Enum&)
:
   Open(NULL),
   GetNumDevices(NULL),
   Close(NULL),
   Read(NULL),
   Write(NULL),
   SetTimeouts(NULL),
   GetTimeouts(NULL),
   FlushBuffers(NULL),
   CheckRxQueue(NULL),
   SetBaudRate(NULL),
   SetLineControl(NULL),
   SetFlowControl(NULL),
   GetProductString(NULL),

   hLibHandle(NULL)
{
   //Check static instance
   if(bStaticSet == FALSE)
   {
      bStaticSet = TRUE;
      try
      {
         clAutoInstance.reset(new SiLabsLibrary());
      }
      catch(...)
      {
         bStaticSet = FALSE;
         throw;
      }
   }

   //load library
   SiLabsError::Enum ret = LoadFunctions();
   if(ret != SiLabsError::NONE)
      throw(ret);

   return;
}

SiLabsLibrary::~SiLabsLibrary() throw()
{
   FreeFunctions();
}


///////////////////////////////////////////////////////////////////////
// Loads USB interface functions from the DLLs.
///////////////////////////////////////////////////////////////////////
SiLabsError::Enum SiLabsLibrary::LoadFunctions()
{
   hLibHandle = LoadLibrary(LIBRARY_NAME);
   if(hLibHandle == NULL)
      return SiLabsError::NO_LIBRARY;

   BOOL bStatus = TRUE;

   Open = (Open_t)GetProcAddress(hLibHandle, "SI_Open");
   if(Open == NULL)
      bStatus = FALSE;

   GetNumDevices = (GetNumDevices_t)GetProcAddress(hLibHandle, "SI_GetNumDevices");
   if(GetNumDevices == NULL)
      bStatus = FALSE;

   Close = (Close_t)GetProcAddress(hLibHandle, "SI_Close");
   if(Close == NULL)
      bStatus = FALSE;

   Read = (Read_t)GetProcAddress(hLibHandle, "SI_Read");
   if(Read == NULL)
      bStatus = FALSE;

   Write = (Write_t)GetProcAddress(hLibHandle, "SI_Write");
   if(Write == NULL)
      bStatus = FALSE;

   SetTimeouts = (SetTimeouts_t)GetProcAddress(hLibHandle, "SI_SetTimeouts");
   if(SetTimeouts == NULL)
      bStatus = FALSE;

   GetTimeouts = (GetTimeouts_t)GetProcAddress(hLibHandle, "SI_GetTimeouts");
   if(GetTimeouts == NULL)
      bStatus = FALSE;

   SetBaudRate = (SetBaudRate_t)GetProcAddress(hLibHandle, "SI_SetBaudRate");
   if(SetBaudRate == NULL)
      bStatus = FALSE;

   SetLineControl = (SetLineControl_t)GetProcAddress(hLibHandle, "SI_SetLineControl");
   if(SetLineControl == NULL)
      bStatus = FALSE;

   SetFlowControl = (SetFlowControl_t)GetProcAddress(hLibHandle, "SI_SetFlowControl");
   if(SetFlowControl == NULL)
      bStatus = FALSE;

   FlushBuffers = (FlushBuffers_t)GetProcAddress(hLibHandle, "SI_FlushBuffers");
   if(FlushBuffers == NULL)
      bStatus = FALSE;

   CheckRxQueue = (CheckRxQueue_t)GetProcAddress(hLibHandle, "SI_CheckRXQueue");
   if(CheckRxQueue == NULL)
      bStatus = FALSE;

   GetProductString = (GetProductString_t)GetProcAddress(hLibHandle, "SI_GetProductString");
   if(GetProductString == NULL)
      bStatus = FALSE;


   if(bStatus == FALSE)
   {
      FreeFunctions();
      return SiLabsError::NO_FUNCTION;
   }

   return SiLabsError::NONE;
}

///////////////////////////////////////////////////////////////////////
// Unloads USB DLLs.
///////////////////////////////////////////////////////////////////////
void SiLabsLibrary::FreeFunctions()
{
   if(hLibHandle != NULL)
   {
      FreeLibrary(hLibHandle);
      hLibHandle = NULL;
   }

   return;
}

#endif //defined(DSI_TYPES_WINDOWS)