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/* wydawca - automatic release submission daemon
   Copyright (C) 2008, 2009, 2010 Sergey Poznyakoff

   Wydawca 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 3 of the License, or (at your
   option) any later version.

   Wydawca 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 wydawca. If not, see <http://www.gnu.org/licenses/>. */

#include <wydawca.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <string.h>
#include <hash.h>
#include <ctype.h>
#include <xalloc.h>

struct timer_slot
{
  char *name;
  double real;
  double self_user;		/* user time in sec */
  double self_system;		/* system time in sec */
  double children_user;		/* user time in sec */
  double children_system;	/* system time in sec */
  struct timeval real_mark;
  struct rusage self_mark;
  struct rusage children_mark;
};

static Hash_table *timer_table;
static size_t _timer_count;

static size_t
hash_string_ci (const char *string, size_t n_buckets)
{
  size_t value = 0;
  unsigned char ch;

  for (; (ch = *string); string++)
    value = (value * 31 + tolower (ch)) % n_buckets;
  return value;
}

/* Calculate the hash of a string.  */
static size_t
timer_hasher (void const *data, unsigned n_buckets)
{
  const struct timer_slot *t = data;
  return hash_string_ci (t->name, n_buckets);
}

/* Compare two strings for equality.  */
static bool
timer_compare (void const *data1, void const *data2)
{
  const struct timer_slot *t1 = data1;
  const struct timer_slot *t2 = data2;
  return strcasecmp (t1->name, t2->name) == 0;
}

/* Allocate a timer structure */
static wydawca_timer_t
timer_alloc (const char *name)
{
  wydawca_timer_t t = xmalloc (sizeof (*t) + strlen (name) + 1);
  memset (t, 0, sizeof (*t));
  t->name = (char *) (t + 1);
  strcpy (t->name, name);
  return t;
}

/* Lookup a timer by its name. If it does not exist, create it. */
wydawca_timer_t
timer_get (const char *name)
{
  wydawca_timer_t tp, ret;

  tp = timer_alloc (name);

  if (!((timer_table
	 || (timer_table = hash_initialize (0, 0,
					    timer_hasher,
					    timer_compare, 0)))
	&& (ret = hash_insert (timer_table, tp))))
    xalloc_die ();

  if (ret != tp)
    free (tp);
  else
    _timer_count++;
  return ret;
}

wydawca_timer_t
timer_start (const char *name)
{
  wydawca_timer_t t = timer_get (name);

  gettimeofday (&t->real_mark, NULL);
  getrusage (RUSAGE_SELF, &t->self_mark);
  getrusage (RUSAGE_CHILDREN, &t->children_mark);
  return t;
}

#define DIFFTIME(now,then)\
   (((now).tv_sec - (then).tv_sec) \
    + ((double)((now).tv_usec - (then).tv_usec))/1000000)

static void
_timer_compute (wydawca_timer_t t)
{
  struct timeval real;
  struct rusage rusage;

  gettimeofday (&real, NULL);
  t->real = DIFFTIME (real, t->real_mark);
  getrusage (RUSAGE_SELF, &rusage);
  t->self_user = DIFFTIME (rusage.ru_utime, t->self_mark.ru_utime);
  t->self_system = DIFFTIME (rusage.ru_stime, t->self_mark.ru_stime);

  getrusage (RUSAGE_CHILDREN, &rusage);
  t->children_user = DIFFTIME (rusage.ru_utime, t->children_mark.ru_utime);
  t->children_system = DIFFTIME (rusage.ru_stime, t->children_mark.ru_stime);
}

wydawca_timer_t
timer_stop (const char *name)
{
  wydawca_timer_t t = timer_get (name);
  _timer_compute (t);
  return t;
}

wydawca_timer_t
timer_reset (const char *name)
{
  wydawca_timer_t t = timer_get (name);
  t->real = 0.0;
  t->self_user = 0.0;
  t->self_system = 0.0;
  t->children_user = 0.0;
  t->children_system = 0.0;
  return t;
}

double
timer_get_real (wydawca_timer_t t)
{
  return t->real;
}

double
timer_get_user (wydawca_timer_t t)
{
  return t->self_user + t->children_user;
}

double
timer_get_system (wydawca_timer_t t)
{
  return t->self_system + t->children_system;
}

char *
timer_format_time (double t)
{
  char *str = NULL;
  if (t < 600)
    asprintf (&str, "%0.3f", t);
  else
    {
      long int s, m, h, d;

      s = (long int) t;
      d = s / (3600 * 24);
      s -= d * 3600 * 24;
      h = s / 3600;
      s -= h * 3600;
      m = s / 60;
      s -= m * 60;

      if (d)
	asprintf (&str, "%ld+%02ld:%02ld:%02ld", d, h, m, s);
      else if (h)
	asprintf (&str, "%02ld:%02ld:%02ld", h, m, s);
      else
	asprintf (&str, "%02ld:%02ld", m, s);
    }
  return str;
}

size_t
timer_get_count ()
{
  return _timer_count;
}

struct timer_data
{
  struct metadef *def;
  size_t num;
};

bool
_fill_meta (void *data, void *proc_data)
{
  struct timer_slot *slot = data;
  struct timer_data *tp = proc_data;
#define CREATE_DEF(arg)							      \
  if (tp->num)								      \
    {									      \
      asprintf (&tp->def->kw, "timer:%s:%s", slot->name, #arg);		      \
      tp->def->storage = timer_format_time (__cat2__(timer_get_,arg) (slot)); \
      tp->def->value = tp->def->storage;				      \
      tp->def->expand = NULL;						      \
      tp->def++;							      \
      tp->num--;							      \
    }
  
  CREATE_DEF(system);
  CREATE_DEF(real);
  CREATE_DEF(user);

  return tp->num > 0;
}

void
timer_fill_meta (struct metadef *def, size_t num)
{
  struct timer_data td;
  if (!timer_table)
    return;
  td.def = def;
  td.num = num;
  hash_do_for_each (timer_table, _fill_meta, &td);
}

void
timer_free_meta (struct metadef *def, size_t num)
{
  while (num--)
    {
      free (def->kw);
      def++;
    }
}

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