// PropVariantConv.cpp

#include "StdAfx.h"

#include "../Common/IntToString.h"

#include "Defs.h"
#include "PropVariantConv.h"

#define UINT_TO_STR_2(c, val) { s[0] = (c); s[1] = (char)('0' + (val) / 10); s[2] = (char)('0' + (val) % 10); s += 3; }

static const unsigned k_TimeStringBufferSize = 64;

bool g_Timestamp_Show_UTC;
#if 0
bool g_Timestamp_Show_DisableZ;
bool g_Timestamp_Show_TDelimeter;
bool g_Timestamp_Show_ZoneOffset;
#endif

Z7_NO_INLINE
bool ConvertUtcFileTimeToString2(const FILETIME &utc, unsigned ns100, char *s, int level, unsigned flags) throw()
{
  *s = 0;
  FILETIME ft;

#if 0
  Int64 bias64 = 0;
#endif

  const bool show_utc =
      (flags & kTimestampPrintFlags_Force_UTC) ? true :
      (flags & kTimestampPrintFlags_Force_LOCAL) ? false :
      g_Timestamp_Show_UTC;

  if (show_utc)
    ft = utc;
  else
  {
    if (!FileTimeToLocalFileTime(&utc, &ft))
      return false;
#if 0
    if (g_Timestamp_Show_ZoneOffset)
    {
      const UInt64 utc64 = (((UInt64)utc.dwHighDateTime) << 32) + utc.dwLowDateTime;
      const UInt64 loc64 = (((UInt64) ft.dwHighDateTime) << 32) +  ft.dwLowDateTime;
      bias64 = (Int64)utc64 - (Int64)loc64;
    }
#endif
  }

  SYSTEMTIME st;
  if (!BOOLToBool(FileTimeToSystemTime(&ft, &st)))
  {
    // win10 : that function doesn't work, if bit 63 of 64-bit FILETIME is set.
    return false;
  }

  {
    unsigned val = st.wYear;
    if (val >= 10000)
    {
      *s++ = (char)('0' + val / 10000);
      val %= 10000;
    }
    s[3] = (char)('0' + val % 10); val /= 10;
    s[2] = (char)('0' + val % 10); val /= 10;
    s[1] = (char)('0' + val % 10);
    s[0] = (char)('0' + val / 10);
    s += 4;
  }
  UINT_TO_STR_2('-', st.wMonth)
  UINT_TO_STR_2('-', st.wDay)
  
  if (level > kTimestampPrintLevel_DAY)
  {
    const char setChar =
#if 0
      g_Timestamp_Show_TDelimeter ? 'T' : // ISO 8601
#endif
      ' ';
    UINT_TO_STR_2(setChar, st.wHour)
    UINT_TO_STR_2(':', st.wMinute)
    
    if (level >= kTimestampPrintLevel_SEC)
    {
      UINT_TO_STR_2(':', st.wSecond)

      if (level > kTimestampPrintLevel_SEC)
      {
        *s++ = '.';
        /*
        {
          unsigned val = st.wMilliseconds;
          s[2] = (char)('0' + val % 10); val /= 10;
          s[1] = (char)('0' + val % 10);
          s[0] = (char)('0' + val / 10);
          s += 3;
        }
        *s++ = ' ';
        */
        
        {
          unsigned numDigits = 7;
          UInt32 val = (UInt32)((((UInt64)ft.dwHighDateTime << 32) + ft.dwLowDateTime) % 10000000);
          for (unsigned i = numDigits; i != 0;)
          {
            i--;
            s[i] = (char)('0' + val % 10); val /= 10;
          }
          if (numDigits > (unsigned)level)
            numDigits = (unsigned)level;
          s += numDigits;
        }
        if (level >= kTimestampPrintLevel_NTFS + 1)
        {
          *s++ = (char)('0' + (ns100 / 10));
          if (level >= kTimestampPrintLevel_NTFS + 2)
            *s++ = (char)('0' + (ns100 % 10));
        }
      }
    }
  }
  
  if (show_utc)
  {
    if ((flags & kTimestampPrintFlags_DisableZ) == 0
#if 0
      && !g_Timestamp_Show_DisableZ
#endif
      )
      *s++ = 'Z';
  }
#if 0
  else if (g_Timestamp_Show_ZoneOffset)
  {
#if 1
    {
      char c;
      if (bias64 < 0)
      {
        bias64 = -bias64;
        c = '+';
      }
      else
        c = '-';
      UInt32 bias = (UInt32)((UInt64)bias64 / (10000000 * 60));
#else
    TIME_ZONE_INFORMATION zi;
    const DWORD dw = GetTimeZoneInformation(&zi);
    if (dw <= TIME_ZONE_ID_DAYLIGHT) // == 2
    {
      // UTC = LOCAL + Bias
      Int32 bias = zi.Bias;
      char c;
      if (bias < 0)
      {
        bias = -bias;
        c = '+';
      }
      else
        c = '-';
#endif
      const UInt32 hours = (UInt32)bias / 60;
      const UInt32 mins = (UInt32)bias % 60;
      UINT_TO_STR_2(c, hours)
      UINT_TO_STR_2(':', mins)
    }
  }
#endif
  *s = 0;
  return true;
}


bool ConvertUtcFileTimeToString(const FILETIME &utc, char *s, int level) throw()
{
  return ConvertUtcFileTimeToString2(utc, 0, s, level);
}

bool ConvertUtcFileTimeToString2(const FILETIME &ft, unsigned ns100, wchar_t *dest, int level) throw()
{
  char s[k_TimeStringBufferSize];
  const bool res = ConvertUtcFileTimeToString2(ft, ns100, s, level);
  for (unsigned i = 0;; i++)
  {
    const Byte c = (Byte)s[i];
    dest[i] = c;
    if (c == 0)
      break;
  }
  return res;
}

bool ConvertUtcFileTimeToString(const FILETIME &ft, wchar_t *dest, int level) throw()
{
  char s[k_TimeStringBufferSize];
  const bool res = ConvertUtcFileTimeToString(ft, s, level);
  for (unsigned i = 0;; i++)
  {
    const Byte c = (Byte)s[i];
    dest[i] = c;
    if (c == 0)
      break;
  }
  return res;
}


void ConvertPropVariantToShortString(const PROPVARIANT &prop, char *dest) throw()
{
  *dest = 0;
  switch (prop.vt)
  {
    case VT_EMPTY: return;
    case VT_BSTR: dest[0] = '?'; dest[1] = 0; return;
    case VT_UI1: ConvertUInt32ToString(prop.bVal, dest); return;
    case VT_UI2: ConvertUInt32ToString(prop.uiVal, dest); return;
    case VT_UI4: ConvertUInt32ToString(prop.ulVal, dest); return;
    case VT_UI8: ConvertUInt64ToString(prop.uhVal.QuadPart, dest); return;
    case VT_FILETIME:
    {
      // const unsigned prec = prop.wReserved1;
      int level = 0;
      /*
      if (prec == 0)
        level = 7;
      else if (prec > 16 && prec <= 16 + 9)
        level = prec - 16;
      */
      ConvertUtcFileTimeToString(prop.filetime, dest, level);
      return;
    }
    // case VT_I1: return ConvertInt64ToString(prop.cVal, dest); return;
    case VT_I2: ConvertInt64ToString(prop.iVal, dest); return;
    case VT_I4: ConvertInt64ToString(prop.lVal, dest); return;
    case VT_I8: ConvertInt64ToString(prop.hVal.QuadPart, dest); return;
    case VT_BOOL: dest[0] = VARIANT_BOOLToBool(prop.boolVal) ? '+' : '-'; dest[1] = 0; return;
    default: dest[0] = '?'; dest[1] = ':'; ConvertUInt64ToString(prop.vt, dest + 2);
  }
}

void ConvertPropVariantToShortString(const PROPVARIANT &prop, wchar_t *dest) throw()
{
  *dest = 0;
  switch (prop.vt)
  {
    case VT_EMPTY: return;
    case VT_BSTR: dest[0] = '?'; dest[1] = 0; return;
    case VT_UI1: ConvertUInt32ToString(prop.bVal, dest); return;
    case VT_UI2: ConvertUInt32ToString(prop.uiVal, dest); return;
    case VT_UI4: ConvertUInt32ToString(prop.ulVal, dest); return;
    case VT_UI8: ConvertUInt64ToString(prop.uhVal.QuadPart, dest); return;
    case VT_FILETIME:
    {
      // const unsigned prec = prop.wReserved1;
      int level = 0;
      /*
      if (prec == 0)
        level = 7;
      else if (prec > 16 && prec <= 16 + 9)
        level = prec - 16;
      */
      ConvertUtcFileTimeToString(prop.filetime, dest, level);
      return;
    }
    // case VT_I1: return ConvertInt64ToString(prop.cVal, dest); return;
    case VT_I2: ConvertInt64ToString(prop.iVal, dest); return;
    case VT_I4: ConvertInt64ToString(prop.lVal, dest); return;
    case VT_I8: ConvertInt64ToString(prop.hVal.QuadPart, dest); return;
    case VT_BOOL: dest[0] = VARIANT_BOOLToBool(prop.boolVal) ? (wchar_t)'+' : (wchar_t)'-'; dest[1] = 0; return;
    default: dest[0] = '?'; dest[1] = ':'; ConvertUInt32ToString(prop.vt, dest + 2);
  }
}