// Windows/PropVariant.cpp

#include "StdAfx.h"

#include "PropVariant.h"

#include "../Common/Defs.h"

namespace NWindows {
namespace NCOM {

CPropVariant::CPropVariant(const PROPVARIANT& varSrc)
{
  vt = VT_EMPTY;
  InternalCopy(&varSrc);
}

CPropVariant::CPropVariant(const CPropVariant& varSrc)
{
  vt = VT_EMPTY;
  InternalCopy(&varSrc);
}

CPropVariant::CPropVariant(BSTR bstrSrc)
{
  vt = VT_EMPTY;
  *this = bstrSrc;
}

CPropVariant::CPropVariant(LPCOLESTR lpszSrc)
{
  vt = VT_EMPTY;
  *this = lpszSrc;
}

CPropVariant& CPropVariant::operator=(const CPropVariant& varSrc)
{
  InternalCopy(&varSrc);
  return *this;
}
CPropVariant& CPropVariant::operator=(const PROPVARIANT& varSrc)
{
  InternalCopy(&varSrc);
  return *this;
}

CPropVariant& CPropVariant::operator=(BSTR bstrSrc)
{
  *this = (LPCOLESTR)bstrSrc;
  return *this;
}

CPropVariant& CPropVariant::operator=(LPCOLESTR lpszSrc)
{
  InternalClear();
  vt = VT_BSTR;
  bstrVal = ::SysAllocString(lpszSrc);
  if (bstrVal == NULL && lpszSrc != NULL)
  {
    vt = VT_ERROR;
    scode = E_OUTOFMEMORY;
  }
  return *this;
}


CPropVariant& CPropVariant::operator=(bool bSrc)
{
  if (vt != VT_BOOL)
  {
    InternalClear();
    vt = VT_BOOL;
  }
  boolVal = bSrc ? VARIANT_TRUE : VARIANT_FALSE;
  return *this;
}

CPropVariant& CPropVariant::operator=(UInt32 value)
{
  if (vt != VT_UI4)
  {
    InternalClear();
    vt = VT_UI4;
  }
  ulVal = value;
  return *this;
}

CPropVariant& CPropVariant::operator=(UInt64 value)
{
  if (vt != VT_UI8)
  {
    InternalClear();
    vt = VT_UI8;
  }
  uhVal.QuadPart = value;
  return *this;
}

CPropVariant& CPropVariant::operator=(const FILETIME &value)
{
  if (vt != VT_FILETIME)
  {
    InternalClear();
    vt = VT_FILETIME;
  }
  filetime = value;
  return *this;
}

CPropVariant& CPropVariant::operator=(Int32 value)
{
  if (vt != VT_I4)
  {
    InternalClear();
    vt = VT_I4;
  }
  lVal = value;
  
  return *this;
}

CPropVariant& CPropVariant::operator=(Byte value)
{
  if (vt != VT_UI1)
  {
    InternalClear();
    vt = VT_UI1;
  }
  bVal = value;
  return *this;
}

CPropVariant& CPropVariant::operator=(Int16 value)
{
  if (vt != VT_I2)
  {
    InternalClear();
    vt = VT_I2;
  }
  iVal = value;
  return *this;
}

/*
CPropVariant& CPropVariant::operator=(LONG value)
{
  if (vt != VT_I4)
  {
    InternalClear();
    vt = VT_I4;
  }
  lVal = value;
  return *this;
}
*/

static HRESULT MyPropVariantClear(PROPVARIANT *propVariant) 
{ 
  switch(propVariant->vt)
  {
    case VT_UI1:
    case VT_I1:
    case VT_I2:
    case VT_UI2:
    case VT_BOOL:
    case VT_I4:
    case VT_UI4:
    case VT_R4:
    case VT_INT:
    case VT_UINT:
    case VT_ERROR:
    case VT_FILETIME:
    case VT_UI8:
    case VT_R8:
    case VT_CY:
    case VT_DATE:
      propVariant->vt = VT_EMPTY;
      return S_OK;
  }
  return ::VariantClear((VARIANTARG *)propVariant); 
}

HRESULT CPropVariant::Clear() 
{ 
  return MyPropVariantClear(this);
}

HRESULT CPropVariant::Copy(const PROPVARIANT* pSrc) 
{ 
  ::VariantClear((tagVARIANT *)this); 
  switch(pSrc->vt)
  {
    case VT_UI1:
    case VT_I1:
    case VT_I2:
    case VT_UI2:
    case VT_BOOL:
    case VT_I4:
    case VT_UI4:
    case VT_R4:
    case VT_INT:
    case VT_UINT:
    case VT_ERROR:
    case VT_FILETIME:
    case VT_UI8:
    case VT_R8:
    case VT_CY:
    case VT_DATE:
      memmove((PROPVARIANT*)this, pSrc, sizeof(PROPVARIANT));
      return S_OK;
  }
  return ::VariantCopy((tagVARIANT *)this, (tagVARIANT *)(pSrc)); 
}


HRESULT CPropVariant::Attach(PROPVARIANT* pSrc)
{
  HRESULT hr = Clear();
  if (FAILED(hr))
    return hr;
  memcpy(this, pSrc, sizeof(PROPVARIANT));
  pSrc->vt = VT_EMPTY;
  return S_OK;
}

HRESULT CPropVariant::Detach(PROPVARIANT* pDest)
{
  HRESULT hr = MyPropVariantClear(pDest);
  if (FAILED(hr))
    return hr;
  memcpy(pDest, this, sizeof(PROPVARIANT));
  vt = VT_EMPTY;
  return S_OK;
}

HRESULT CPropVariant::InternalClear()
{
  HRESULT hr = Clear();
  if (FAILED(hr))
  {
    vt = VT_ERROR;
    scode = hr;
  }
  return hr;
}

void CPropVariant::InternalCopy(const PROPVARIANT* pSrc)
{
  HRESULT hr = Copy(pSrc);
  if (FAILED(hr))
  {
    vt = VT_ERROR;
    scode = hr;
  }
}

int CPropVariant::Compare(const CPropVariant &a)
{
  if(vt != a.vt)
    return 0; // it's mean some bug
  switch (vt)
  {
    case VT_EMPTY:
      return 0;
    
    /*
    case VT_I1:
      return MyCompare(cVal, a.cVal);
    */
    case VT_UI1:
      return MyCompare(bVal, a.bVal);

    case VT_I2:
      return MyCompare(iVal, a.iVal);
    case VT_UI2:
      return MyCompare(uiVal, a.uiVal);
    
    case VT_I4:
      return MyCompare(lVal, a.lVal);
    /*
    case VT_INT:
      return MyCompare(intVal, a.intVal);
    */
    case VT_UI4:
      return MyCompare(ulVal, a.ulVal);
    /*
    case VT_UINT:
      return MyCompare(uintVal, a.uintVal);
    */
    case VT_I8:
      return MyCompare(hVal.QuadPart, a.hVal.QuadPart);
    case VT_UI8:
      return MyCompare(uhVal.QuadPart, a.uhVal.QuadPart);

    case VT_BOOL:    
      return -MyCompare(boolVal, a.boolVal);

    case VT_FILETIME:
      return ::CompareFileTime(&filetime, &a.filetime);
    case VT_BSTR:
      return 0; // Not implemented 
      // return MyCompare(aPropVarint.cVal);

    default:
      return 0;
  }
}

}}
