// Windows/PropVariant.h

#ifndef __WINDOWS_PROP_VARIANT_H
#define __WINDOWS_PROP_VARIANT_H

#include "../Common/MyTypes.h"
#include "../Common/MyWindows.h"
#include "../Common/MyString.h"

namespace NWindows {
namespace NCOM {

BSTR AllocBstrFromAscii(const char *s) throw();

HRESULT PropVariant_Clear(PROPVARIANT *p) throw();

HRESULT PropVarEm_Alloc_Bstr(PROPVARIANT *p, unsigned numChars) throw();
HRESULT PropVarEm_Set_Str(PROPVARIANT *p, const char *s) throw();

inline void PropVarEm_Set_UInt32(PROPVARIANT *p, UInt32 v) throw()
{
  p->vt = VT_UI4;
  p->ulVal = v;
}

inline void PropVarEm_Set_UInt64(PROPVARIANT *p, UInt64 v) throw()
{
  p->vt = VT_UI8;
  p->uhVal.QuadPart = v;
}

inline void PropVarEm_Set_FileTime64_Prec(PROPVARIANT *p, UInt64 v, unsigned prec) throw()
{
  p->vt = VT_FILETIME;
  p->filetime.dwLowDateTime = (DWORD)v;
  p->filetime.dwHighDateTime = (DWORD)(v >> 32);
  p->wReserved1 = (WORD)prec;
  p->wReserved2 = 0;
  p->wReserved3 = 0;
}

inline void PropVarEm_Set_Bool(PROPVARIANT *p, bool b) throw()
{
  p->vt = VT_BOOL;
  p->boolVal = (b ? VARIANT_TRUE : VARIANT_FALSE);
}


class CPropVariant : public tagPROPVARIANT
{
  // ---------- forbidden functions ----------
  CPropVariant(const char *s);
  // CPropVariant(const UString &s);
 #ifdef DEBUG_FSTRING_INHERITS_ASTRING
  CPropVariant(const FString &s);
  CPropVariant& operator=(const FString &s);
 #endif

public:
  CPropVariant()
  {
    vt = VT_EMPTY;
    wReserved1 = 0;
    // wReserved2 = 0;
    // wReserved3 = 0;
    // uhVal.QuadPart = 0;
    bstrVal = 0;
  }


  void Set_FtPrec(unsigned prec)
  {
    wReserved1 = (WORD)prec;
    wReserved2 = 0;
    wReserved3 = 0;
  }

  void SetAsTimeFrom_FT_Prec(const FILETIME &ft, unsigned prec)
  {
    operator=(ft);
    Set_FtPrec(prec);
  }

  void SetAsTimeFrom_Ft64_Prec(UInt64 v, unsigned prec)
  {
    FILETIME ft;
    ft.dwLowDateTime = (DWORD)(UInt32)v;
    ft.dwHighDateTime = (DWORD)(UInt32)(v >> 32);
    operator=(ft);
    Set_FtPrec(prec);
  }

  void SetAsTimeFrom_FT_Prec_Ns100(const FILETIME &ft, unsigned prec, unsigned ns100)
  {
    operator=(ft);
    wReserved1 = (WORD)prec;
    wReserved2 = (WORD)ns100;
    wReserved3 = 0;
  }

  unsigned Get_Ns100() const
  {
    const unsigned prec = wReserved1;
    const unsigned ns100 = wReserved2;
    if (prec == 0
        && prec <= k_PropVar_TimePrec_1ns
        && ns100 < 100 
        && wReserved3 == 0)
      return ns100;
    return 0;
  }

  ~CPropVariant();
  CPropVariant(const PROPVARIANT &varSrc);
  CPropVariant(const CPropVariant &varSrc);
  CPropVariant(BSTR bstrSrc);
  CPropVariant(LPCOLESTR lpszSrc);
  CPropVariant(bool bSrc) { vt = VT_BOOL; wReserved1 = 0; boolVal = (bSrc ? VARIANT_TRUE : VARIANT_FALSE); }
  CPropVariant(Byte value) { vt = VT_UI1; wReserved1 = 0; bVal = value; }

private:
  CPropVariant(UInt16 value); // { vt = VT_UI2; wReserved1 = 0; uiVal = value; }
  CPropVariant(Int16 value); // { vt = VT_I2; wReserved1 = 0; iVal = value; }
  CPropVariant(Int32 value); // { vt = VT_I4; wReserved1 = 0; lVal = value; }
  CPropVariant(Int64 value); // { vt = VT_I8; wReserved1 = 0; hVal.QuadPart = value; }

public:
  CPropVariant(UInt32 value) { vt = VT_UI4; wReserved1 = 0; ulVal = value; }
  CPropVariant(UInt64 value) { vt = VT_UI8; wReserved1 = 0; uhVal.QuadPart = value; }
  CPropVariant(const FILETIME &value) { vt = VT_FILETIME; wReserved1 = 0; filetime = value; }

  CPropVariant& operator=(const CPropVariant &varSrc);
  CPropVariant& operator=(const PROPVARIANT &varSrc);
  CPropVariant& operator=(BSTR bstrSrc);
  CPropVariant& operator=(LPCOLESTR lpszSrc);
  CPropVariant& operator=(const UString &s);
  CPropVariant& operator=(const UString2 &s);
  CPropVariant& operator=(const char *s);
  CPropVariant& operator=(const AString &s)
    { return (*this)=(const char *)s; }
  
  CPropVariant& operator=(bool bSrc) throw();
  CPropVariant& operator=(Byte value) throw();
  
private:
  CPropVariant& operator=(Int16 value) throw();
  CPropVariant& operator=(UInt16 value) throw();
  CPropVariant& operator=(Int32 value) throw();
  CPropVariant& operator=(Int64 value) throw();

public:
  CPropVariant& operator=(UInt32 value) throw();
  CPropVariant& operator=(UInt64 value) throw();
  CPropVariant& operator=(const FILETIME &value) throw();

  void Set_Int32(Int32 value) throw();
  void Set_Int64(Int64 value) throw();

  BSTR AllocBstr(unsigned numChars);

  HRESULT Clear() throw();
  HRESULT Copy(const PROPVARIANT *pSrc) throw();
  HRESULT Attach(PROPVARIANT *pSrc) throw();
  HRESULT Detach(PROPVARIANT *pDest) throw();

  HRESULT InternalClear() throw();
  void InternalCopy(const PROPVARIANT *pSrc);
  int Compare(const CPropVariant &a) throw();
};

}}

#endif
