/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Copyright (C) 2008 MySQL
 *
 *  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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

/*
  This is a private header of sql-common library, containing
  declarations for my_time.c
*/

#ifndef _libdrizzle_my_time_h_
#define _libdrizzle_my_time_h_

#include "drizzled/global.h"
#include "drizzle_time.h"

C_MODE_START

extern uint64_t log_10_int[20];
extern uchar days_in_month[];

/*
  Portable time_t replacement.
  Should be signed and hold seconds for 1902 -- 2038-01-19 range
  i.e at least a 32bit variable

  Using the system built in time_t is not an option as
  we rely on the above requirements in the time functions

  For example QNX has an unsigned time_t type
*/
typedef long my_time_t;

#define MY_TIME_T_MAX INT32_MAX
#define MY_TIME_T_MIN INT32_MIN

/* Time handling defaults */
#define TIMESTAMP_MAX_YEAR 2038
#define TIMESTAMP_MIN_YEAR (1900 + YY_PART_YEAR - 1)
#define TIMESTAMP_MAX_VALUE INT32_MAX
#define TIMESTAMP_MIN_VALUE 1

/* two-digit years < this are 20..; >= this are 19.. */
#define YY_PART_YEAR	   70

/* Flags to str_to_datetime */
#define TIME_FUZZY_DATE		1
#define TIME_DATETIME_ONLY	2
/* Must be same as MODE_NO_ZERO_IN_DATE */
#define TIME_NO_ZERO_IN_DATE    (65536L*2*2*2*2*2*2*2)
/* Must be same as MODE_NO_ZERO_DATE */
#define TIME_NO_ZERO_DATE	(TIME_NO_ZERO_IN_DATE*2)
#define TIME_INVALID_DATES	(TIME_NO_ZERO_DATE*2)

#define DRIZZLE_TIME_WARN_TRUNCATED    1
#define DRIZZLE_TIME_WARN_OUT_OF_RANGE 2

/* Limits for the TIME data type */
#define TIME_MAX_HOUR 838
#define TIME_MAX_MINUTE 59
#define TIME_MAX_SECOND 59
#define TIME_MAX_VALUE (TIME_MAX_HOUR*10000 + TIME_MAX_MINUTE*100 + \
                        TIME_MAX_SECOND)
#define TIME_MAX_VALUE_SECONDS (TIME_MAX_HOUR * 3600L + \
                                TIME_MAX_MINUTE * 60L + TIME_MAX_SECOND)

bool check_date(const DRIZZLE_TIME *ltime, bool not_zero_date,
                   ulong flags, int *was_cut);
enum enum_drizzle_timestamp_type
str_to_datetime(const char *str, uint length, DRIZZLE_TIME *l_time,
                uint flags, int *was_cut);
int64_t number_to_datetime(int64_t nr, DRIZZLE_TIME *time_res,
                            uint flags, int *was_cut);
uint64_t TIME_to_uint64_t_datetime(const DRIZZLE_TIME *);
uint64_t TIME_to_uint64_t_date(const DRIZZLE_TIME *);
uint64_t TIME_to_uint64_t_time(const DRIZZLE_TIME *);
uint64_t TIME_to_uint64_t(const DRIZZLE_TIME *);


bool str_to_time(const char *str,uint length, DRIZZLE_TIME *l_time,
                 int *warning);

int check_time_range(DRIZZLE_TIME *my_time, int *warning);

long calc_daynr(uint year,uint month,uint day);
uint calc_days_in_year(uint year);
uint year_2000_handling(uint year);

void init_time(void);


/*
  Function to check sanity of a TIMESTAMP value

  DESCRIPTION
    Check if a given DRIZZLE_TIME value fits in TIMESTAMP range.
    This function doesn't make precise check, but rather a rough
    estimate.

  RETURN VALUES
    false   The value seems sane
    true    The DRIZZLE_TIME value is definitely out of range
*/

static inline bool validate_timestamp_range(const DRIZZLE_TIME *t)
{
  if ((t->year > TIMESTAMP_MAX_YEAR || t->year < TIMESTAMP_MIN_YEAR) ||
      (t->year == TIMESTAMP_MAX_YEAR && (t->month > 1 || t->day > 19)) ||
      (t->year == TIMESTAMP_MIN_YEAR && (t->month < 12 || t->day < 31)))
    return false;

  return true;
}

my_time_t 
my_system_gmt_sec(const DRIZZLE_TIME *t, long *my_timezone,
                  bool *in_dst_time_gap);

void set_zero_time(DRIZZLE_TIME *tm, enum enum_drizzle_timestamp_type time_type);

/*
  Required buffer length for my_time_to_str, my_date_to_str,
  my_datetime_to_str and TIME_to_string functions. Note, that the
  caller is still responsible to check that given TIME structure
  has values in valid ranges, otherwise size of the buffer could
  be not enough. We also rely on the fact that even wrong values
  sent using binary protocol fit in this buffer.
*/
#define MAX_DATE_STRING_REP_LENGTH 30

int my_time_to_str(const DRIZZLE_TIME *l_time, char *to);
int my_date_to_str(const DRIZZLE_TIME *l_time, char *to);
int my_datetime_to_str(const DRIZZLE_TIME *l_time, char *to);
int my_TIME_to_str(const DRIZZLE_TIME *l_time, char *to);

/* 
  Available interval types used in any statement.

  'interval_type' must be sorted so that simple intervals comes first,
  ie year, quarter, month, week, day, hour, etc. The order based on
  interval size is also important and the intervals should be kept in a
  large to smaller order. (get_interval_value() depends on this)
 
  Note: If you change the order of elements in this enum you should fix 
  order of elements in 'interval_type_to_name' and 'interval_names' 
  arrays 
  
  See also interval_type_to_name, get_interval_value, interval_names
*/

enum interval_type
{
  INTERVAL_YEAR, INTERVAL_QUARTER, INTERVAL_MONTH, INTERVAL_WEEK, INTERVAL_DAY,
  INTERVAL_HOUR, INTERVAL_MINUTE, INTERVAL_SECOND, INTERVAL_MICROSECOND,
  INTERVAL_YEAR_MONTH, INTERVAL_DAY_HOUR, INTERVAL_DAY_MINUTE,
  INTERVAL_DAY_SECOND, INTERVAL_HOUR_MINUTE, INTERVAL_HOUR_SECOND,
  INTERVAL_MINUTE_SECOND, INTERVAL_DAY_MICROSECOND, INTERVAL_HOUR_MICROSECOND,
  INTERVAL_MINUTE_MICROSECOND, INTERVAL_SECOND_MICROSECOND, INTERVAL_LAST
};

C_MODE_END

#endif /* _libdrizzle_my_time_h_ */