/*
 * static char *rcsid_time_c =
 *    "$Id: time.c 7568 2007-11-24 21:17:09Z akirschbaum $";
 */

/*
    CrossFire, A Multiplayer game for X-windows

    Copyright (C) 2006 Mark Wedel & Crossfire Development Team
    Copyright (C) 1992 Frank Tore Johansen

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

    The authors can be reached via e-mail at crossfire-devel@real-time.com
*/

#include <global.h>
#include <funcpoint.h>
#include <tod.h>

#ifndef WIN32 /* ---win32 exclude header */
#include <stdio.h>
#include <sys/types.h>
#include <sys/time.h>
#endif /* win32 */

/*
 * Global variables:
 */
uint32 max_time = MAX_TIME;
struct timeval last_time;

#define PBUFLEN 100
uint32 process_utime_save[PBUFLEN];
uint32 psaveind;
uint32 process_max_utime = 0;
uint32 process_min_utime = 999999999;
uint32 process_tot_mtime;
uint32 pticks;
uint32 process_utime_long_count;

const char *season_name[] =
{
        "The Season of New Year",
        "The Season of Growth",
        "The Season of Harvest",
        "The Season of Decay",
        "The Season of the Blizzard",
        "\n"
};

const char *weekdays[DAYS_PER_WEEK] = {
   "the Day of the Moon",
   "the Day of the Bull",
   "the Day of the Deception",
   "the Day of Thunder",
   "the Day of Freedom",
   "the Day of the Great Gods",
   "the Day of the Sun"
};

const char *month_name[MONTHS_PER_YEAR] = {
   "Month of Winter",           /* 0 */
   "Month of the Ice Dragon",
   "Month of the Frost Giant",
   "Month of Valriel",
   "Month of Lythander",
   "Month of the Harvest",
   "Month of Gaea",
   "Month of Futility",
   "Month of the Dragon",
   "Month of the Sun",
   "Month of the Great Infernus",
   "Month of Ruggilli",
   "Month of the Dark Shades",
   "Month of the Devourers",
   "Month of Sorig",
   "Month of the Ancient Darkness",
   "Month of Gorokh"
};

/*
 * Initialise all variables used in the timing routines. 
 */

void
reset_sleep(void)
{
  int i;
  for(i = 0; i < PBUFLEN; i++)
    process_utime_save[i] = 0;
  psaveind = 0;
  process_max_utime = 0;
  process_min_utime = 999999999;
  process_tot_mtime = 0;
  pticks = 0;

  (void) GETTIMEOFDAY(&last_time);
}

void
log_time(long process_utime)
{
  pticks++;
  if (++psaveind >= PBUFLEN)
    psaveind = 0;
  process_utime_save[psaveind] = process_utime;
  if (process_utime > process_max_utime)
    process_max_utime = process_utime;
  if (process_utime < process_min_utime)
    process_min_utime = process_utime;
  process_tot_mtime += process_utime/1000;
}

/*
 * enough_elapsed_time will return true if the time passed since
 * last tick is more than max-time.
 */

int
enough_elapsed_time(void)
{
  static struct timeval new_time;
  long elapsed_utime;

  (void) GETTIMEOFDAY(&new_time);

  elapsed_utime = (new_time.tv_sec - last_time.tv_sec) * 1000000 +
                  new_time.tv_usec - last_time.tv_usec;
  if (elapsed_utime > max_time) {
    log_time(elapsed_utime);
    last_time.tv_sec = new_time.tv_sec;
    last_time.tv_usec = new_time.tv_usec;
    return 1;
  }
  return 0;
}

/*
 * sleep_delta checks how much time has elapsed since last tick.
 * If it is less than max_time, the remaining time is slept with select().
 */

void
sleep_delta(void)
{
  static struct timeval new_time;
  long sleep_sec, sleep_usec;

  (void) GETTIMEOFDAY(&new_time);

  sleep_sec = last_time.tv_sec - new_time.tv_sec;
  sleep_usec = max_time - (new_time.tv_usec - last_time.tv_usec);

  /* This is very ugly, but probably the fastest for our use: */
  while (sleep_usec < 0) {
    sleep_usec += 1000000;
    sleep_sec -= 1;
  }
  while (sleep_usec > 1000000) {
    sleep_usec -= 1000000;
    sleep_sec +=1;
  }

  log_time((new_time.tv_sec - last_time.tv_sec)*1000000
           + new_time.tv_usec - last_time.tv_usec);

  if (sleep_sec >= 0 && sleep_usec > 0) {
    static struct timeval sleep_time;
    sleep_time.tv_sec = sleep_sec;
    sleep_time.tv_usec = sleep_usec;

#ifndef WIN32 /* 'select' doesn't work on Windows, 'Sleep' is used instead */
    select(0, NULL, NULL, NULL, &sleep_time);
#else
    if (sleep_time.tv_sec) Sleep(sleep_time.tv_sec*1000);
    Sleep((int)(sleep_time.tv_usec/1000.));
#endif
  }
  else
    process_utime_long_count++;
  /*
   * Set last_time to when we're expected to wake up:
   */
  last_time.tv_usec += max_time;
  while (last_time.tv_usec > 1000000) {
    last_time.tv_usec -= 1000000;
    last_time.tv_sec++;
  }
  /*
   * Don't do too much catching up:
   * (Things can still get jerky on a slow/loaded computer)
   */
  if (last_time.tv_sec * 1000000 + last_time.tv_usec <
      new_time.tv_sec * 1000000 + new_time.tv_usec)
  {
    last_time.tv_sec = new_time.tv_sec;
    last_time.tv_usec = new_time.tv_usec;
  }
}

void
set_max_time(long t) {
  max_time = t;
}

extern unsigned long todtick;

void
get_tod(timeofday_t *tod)
{
  tod->year = todtick/HOURS_PER_YEAR;
  tod->month = (todtick/HOURS_PER_MONTH)%MONTHS_PER_YEAR;
  tod->day = (todtick%HOURS_PER_MONTH)/DAYS_PER_MONTH;
  tod->dayofweek = tod->day%DAYS_PER_WEEK;
  tod->hour = todtick%HOURS_PER_DAY;
  tod->minute = (pticks%PTICKS_PER_CLOCK)/(PTICKS_PER_CLOCK/58);
  if (tod->minute > 58)
     tod->minute = 58; /* it's imprecise at best anyhow */
  tod->weekofmonth = tod->day/WEEKS_PER_MONTH;
  if (tod->month < 3)
    tod->season = 0;
  else if (tod->month < 6)
    tod->season = 1;
  else if (tod->month < 9)
    tod->season = 2;
  else if (tod->month < 12)
    tod->season = 3;
  else
    tod->season = 4;
}

void
print_tod(object *op)
{
  timeofday_t tod;
  const char *suf;
  int day;

  get_tod(&tod);
  sprintf(errmsg, "It is %d minute%s past %d o'clock %s, on %s",
    tod.minute+1, ((tod.minute+1 < 2) ? "" : "s"),
    ((tod.hour % 14 == 0) ? 14 : ((tod.hour)%14)),
    ((tod.hour >= 14) ? "pm" : "am"),
    weekdays[tod.dayofweek]);
  new_draw_info(NDI_UNIQUE, 0,op,errmsg);

  day = tod.day + 1;
  if (day == 1 || ((day % 10) == 1 && day > 20))
    suf = "st";
  else if (day == 2 || ((day % 10) == 2 && day > 20))
    suf = "nd";
  else if (day == 3 || ((day % 10) == 3 && day > 20))
    suf = "rd";
  else
    suf = "th";
  sprintf(errmsg, "The %d%s Day of the %s, Year %d", day, suf,
    month_name[tod.month], tod.year+1);
  new_draw_info(NDI_UNIQUE, 0,op,errmsg);

  sprintf(errmsg, "Time of Year: %s", season_name[tod.season]);
  new_draw_info(NDI_UNIQUE, 0,op,errmsg);
}

void
time_info(object *op)
{
  int tot = 0, maxt = 0, mint = 99999999, long_count = 0, i;

  print_tod(op);
  if (!QUERY_FLAG(op,FLAG_WIZ))
    return;

  new_draw_info (NDI_UNIQUE, 0,op,"Total time:");
  sprintf(errmsg,"ticks=%d  time=%d.%2d",
          pticks, process_tot_mtime/1000, process_tot_mtime%1000);
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);
  sprintf(errmsg,"avg time=%dms  max time=%dms  min time=%dms",
          process_tot_mtime/pticks, process_max_utime/1000,
          process_min_utime/1000);
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);
  sprintf(errmsg,"ticks longer than max time (%dms) = %d (%d%%)",
          max_time/1000,
          process_utime_long_count, 100*process_utime_long_count/pticks);
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);

  sprintf(errmsg,"Time last %d ticks:", pticks > PBUFLEN ? PBUFLEN : pticks);
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);

  for (i = 0; i < (pticks > PBUFLEN ? PBUFLEN : pticks); i++) {
    tot += process_utime_save[i];
    if (process_utime_save[i] > maxt) maxt = process_utime_save[i];
    if (process_utime_save[i] < mint) mint = process_utime_save[i];
    if (process_utime_save[i] > max_time) long_count++;
  }

  sprintf(errmsg,"avg time=%dms  max time=%dms  min time=%dms",
          tot/(pticks > PBUFLEN ? PBUFLEN : pticks)/1000, maxt/1000,
          mint/1000);
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);
  sprintf(errmsg,"ticks longer than max time (%dms) = %d (%d%%)",
          max_time/1000, long_count,
          100*long_count/(pticks > PBUFLEN ? PBUFLEN : pticks));
  new_draw_info (NDI_UNIQUE, 0,op,errmsg);
}

long
seconds(void)
{
  struct timeval now;

  (void) GETTIMEOFDAY(&now);
  return now.tv_sec;
}