/* Copyright (C) 1998, 1999  Cygnus Solutions

   This file is part of libgcj.

This software is copyrighted work licensed under the terms of the
Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
details.  */

#include <config.h>

// We want to make sure to pick up the POSIX `_r' functions.  Some
// systems, such as Solaris 2.6, require this define in order to
// declare the functions in the appropriate header.
#if defined (HAVE_GMTIME_R) || defined (HAVE_LOCALTIME_R)
#  define _POSIX_PTHREAD_SEMANTICS
#  ifndef _REENTRANT
#    define _REENTRANT
#  endif /* _REENTRANT */
#endif

#ifdef ECOS
#include <string.h>
#endif

#include <gcj/cni.h>
#include <java/util/TimeZone.h>
#include <java/util/GregorianCalendar.h>
#include <time.h>

void
java::util::GregorianCalendar::computeTime ()
{
  struct tm tim;
  tim.tm_sec = elements(fields)[SECOND];
  tim.tm_min = elements(fields)[MINUTE];
  tim.tm_hour = elements(fields)[HOUR_OF_DAY];
  tim.tm_mday = elements(fields)[DATE];
  tim.tm_mon = elements(fields)[MONTH];
  tim.tm_year = elements(fields)[YEAR] - 1900;
  tim.tm_isdst = 0;  // FIXME
#ifndef ECOS
  // FIXME: None of the standard C library access to the ECOS calendar
  // is yet available.
  time_t t = mktime (&tim);
#else
  time_t t = 0;
#endif

  // Adjust for local timezone (introduced by mktime) and our
  // timezone.
#if defined (STRUCT_TM_HAS_GMTOFF)
  t += tim.tm_gmtoff;
#elif defined (HAVE_TIMEZONE)
  t -= timezone;
#endif
  java::util::TimeZone *zone = getTimeZone ();
  t += zone->getRawOffset();

  // Adjust for milliseconds.
  time = t * (jlong) 1000 + elements(fields)[MILLISECOND];

  isTimeSet = true;
}

void
java::util::GregorianCalendar::computeFields ()
{
  time_t t = time / 1000;
  int millis = time % 1000;
  if (t < 0 && millis != 0)
    {
      t--;
      millis = t - 1000 * t;
    }
  elements(fields)[MILLISECOND] = millis;
  struct tm tim;
  java::util::TimeZone *zone = getTimeZone ();

  // FIXME: None of the standard C library access to the ECOS calendar
  // is yet available.
#ifdef ECOS
  memset (&tim, 0, sizeof tim); 
#else
  if (zone->getRawOffset() == 0 || ! zone->useDaylightTime())
    {
#if defined(__JV_POSIX_THREADS__) && defined(HAVE_GMTIME_R)
      gmtime_r (&t, &tim);
#else
      // Get global lock (because gmtime uses a global buffer).  FIXME
      tim = *(struct tm*) gmtime (&t);
      // Release global lock.  FIXME
#endif
    }
  else
    {
#if defined(__JV_POSIX_THREADS__) && defined(HAVE_LOCALTIME_R)
      localtime_r (&t, &tim);
#else
      // Get global lock (because localtime uses a global buffer).  FIXME
      tim = *(struct tm*) localtime (&t);
      // Release global lock.  FIXME
#endif
    }
#endif /* ECOS */
  elements(fields)[SECOND] = tim.tm_sec;
  elements(fields)[MINUTE] = tim.tm_min;
  elements(fields)[HOUR_OF_DAY] = tim.tm_hour;
  elements(fields)[AM_PM] = tim.tm_hour < 12 ? AM : PM;
  elements(fields)[HOUR] = tim.tm_hour % 12;
  elements(fields)[DATE] = tim.tm_mday;
  elements(fields)[MONTH] = tim.tm_mon;
  elements(fields)[YEAR] = 1900 + tim.tm_year;
  elements(fields)[DAY_OF_WEEK] = tim.tm_wday + 1;
  elements(fields)[DAY_OF_WEEK_IN_MONTH] = ((tim.tm_mday - 1) / 7) + 1;
  elements(fields)[DAY_OF_YEAR] = tim.tm_yday + 1;
  elements(fields)[WEEK_OF_MONTH]
    = (tim.tm_mday + 6 + (5 - tim.tm_wday + getFirstDayOfWeek()) % 7) / 7;
  elements(fields)[WEEK_OF_YEAR]
    = (tim.tm_yday + 7 + (5 - tim.tm_wday + getFirstDayOfWeek()) % 7) / 7;
  elements(fields)[ERA] = AD;
  elements(fields)[DST_OFFSET] = tim.tm_isdst <= 0 ? 0 : 60*60*1000;
  elements(fields)[ZONE_OFFSET] = getTimeZone()->getRawOffset();
  areFieldsSet = true;
}
