/* ====================================================================
 * The Apache Software License, Version 1.1
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 * reserved.
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 *
 * This software consists of voluntary contributions made by many
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 */

#ifndef APR_TIME_H
#define APR_TIME_H

#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
/**
 * @file apr_time.h
 * @brief APR Time Library
 */
/**
 * @defgroup APR_Time Time Routines
 * @ingroup APR
 * @{
 */
/** month names */
APR_DECLARE_DATA extern const char apr_month_snames[12][4];
/** day names */
APR_DECLARE_DATA extern const char apr_day_snames[7][4];


/** number of microseconds since 00:00:00 january 1, 1970 UTC */
typedef apr_int64_t apr_time_t;


/** mechanism to properly type apr_time_t literals */
#define APR_TIME_C(val) APR_INT64_C(val)

/** mechanism to properly print apr_time_t values */
#define APR_TIME_T_FMT APR_INT64_T_FMT

/** intervals for I/O timeouts, in microseconds */
typedef apr_int64_t apr_interval_time_t;
typedef apr_int32_t apr_short_interval_time_t;

#define APR_USEC_PER_SEC APR_TIME_C(1000000)


/**
 * return the current time
 */
APR_DECLARE(apr_time_t) apr_time_now(void);

/**
 * a structure similar to ANSI struct tm with the following differences:
 *  - tm_usec isn't an ANSI field
 *  - tm_gmtoff isn't an ANSI field (it's a bsdism)
 */
typedef struct apr_exploded_time_t apr_exploded_time_t;

struct apr_exploded_time_t {
    /** microseconds past tm_sec */
    apr_int32_t tm_usec;
    /** (0-61) seconds past tm_min */
    apr_int32_t tm_sec;
    /** (0-59) minutes past tm_hour */
    apr_int32_t tm_min;
    /** (0-23) hours past midnight */
    apr_int32_t tm_hour;
    /** (1-31) day of the month */
    apr_int32_t tm_mday;
    /** (0-11) month of the year */
    apr_int32_t tm_mon;
    /** year since 1900 */
    apr_int32_t tm_year;
    /** (0-6) days since sunday */
    apr_int32_t tm_wday;
    /** (0-365) days since jan 1 */
    apr_int32_t tm_yday;
    /** daylight saving time */
    apr_int32_t tm_isdst;
    /** seconds east of UTC */
    apr_int32_t tm_gmtoff;
};

/**
 * convert an ansi time_t to an apr_time_t
 * @param result the resulting apr_time_t
 * @param input the time_t to convert
 */
APR_DECLARE(apr_status_t) apr_ansi_time_to_apr_time(apr_time_t *result, 
                                                    time_t input);

/**
 * convert a time to its human readable components using an offset
 * from GMT
 * @param result the exploded time
 * @param input the time to explode
 * @param offs the number of seconds offset to apply
 * @param zone the zone description
 */
APR_DECLARE(apr_status_t) apr_explode_time(apr_exploded_time_t *result,
                                           apr_time_t input,
                                           apr_int32_t offs);

/**
 * convert a time to its human readable components in GMT timezone
 * @param result the exploded time
 * @param input the time to explode
 */
APR_DECLARE(apr_status_t) apr_explode_gmt(apr_exploded_time_t *result, 
                                          apr_time_t input);

/**
 * convert a time to its human readable components in local timezone
 * @param result the exploded time
 * @param input the time to explode
 */
APR_DECLARE(apr_status_t) apr_explode_localtime(apr_exploded_time_t *result, 
                                                apr_time_t input);

/**
 * Convert time value from human readable format to a numeric apr_time_t 
 * e.g. elapsed usec since epoch
 * @param result the resulting imploded time
 * @param input the input exploded time
 */
APR_DECLARE(apr_status_t) apr_implode_time(apr_time_t *result, 
                                           apr_exploded_time_t *input);

/**
 * Convert time value from human readable format to a numeric apr_time_t that
 * always represents GMT
 * @param result the resulting imploded time
 * @param input the input exploded time
 */
APR_DECLARE(apr_status_t) apr_implode_gmt(apr_time_t *result, 
                                          apr_exploded_time_t *input);

/**
 * Sleep for the specified number of micro-seconds.
 * @param t desired amount of time to sleep.
 * @warning May sleep for longer than the specified time. 
 */
APR_DECLARE(void) apr_sleep(apr_interval_time_t t);

/** length of a RFC822 Date */
#define APR_RFC822_DATE_LEN (30)
/**
 * apr_rfc822_date formats dates in the RFC822
 * format in an efficient manner.  it is a fixed length
 * format and requires the indicated amount of storage
 * including trailing \0
 * @param date_str String to write to.
 * @param t the time to convert 
 */
APR_DECLARE(apr_status_t) apr_rfc822_date(char *date_str, apr_time_t t);

/** length of a CTIME date */
#define APR_CTIME_LEN (25)
/**
 * apr_ctime formats dates in the ctime() format
 * in an efficient manner.  it is a fixed length format
 * and requires the indicated amount of storage
 * Unlike ANSI/ISO C ctime(), apr_ctime() does not include
 * a \n at the end of the string.
 * including trailing \0 
 * @param date_str String to write to.
 * @param t the time to convert 
 */
APR_DECLARE(apr_status_t) apr_ctime(char *date_str, apr_time_t t);

/**
 * formats the exploded time according to the format specified
 * @param s string to write to
 * @param retsize The length of the returned string
 * @param max The maximum length of the string
 * @param format The format for the time string
 * @param tm The time to convert
 */
APR_DECLARE(apr_status_t) apr_strftime(char *s, apr_size_t *retsize, 
                                       apr_size_t max, const char *format, 
                                       apr_exploded_time_t *tm);

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_TIME_H */