/*
  time.h - low level time and date functions
*/

/*
  July 3 2011 - fixed elapsedSecsThisWeek macro (thanks Vincent Valdy for this)
              - fixed  daysToTime_t macro (thanks maniacbug)
*/

#ifndef _Time_h
#ifdef __cplusplus
#define _Time_h

#include <inttypes.h>
#ifndef __AVR__
#include <sys/types.h> // for __time_t_defined, but avr libc lacks sys/types.h
#endif

#if !defined(__time_t_defined) // avoid conflict with newlib or other posix libc
typedef unsigned long time_t;
#endif

#define usePPS
#define TIMELIB_ENABLE_MILLIS

// This ugly hack allows us to define C++ overloaded functions, when included
// from within an extern "C", as newlib's sys/stat.h does.  Actually it is
// intended to include "time.h" from the C library (on ARM, but AVR does not
// have that file at all).  On Mac and Windows, the compiler will find this
// "Time.h" instead of the C library "time.h", so we may cause other weird
// and unpredictable effects by conflicting with the C library header "time.h",
// but at least this hack lets us define C++ functions as intended.  Hopefully
// nothing too terrible will result from overriding the C library header?!
extern "C++" {
typedef enum { timeNotSet, timeNeedsSync, timeSet } timeStatus_t;

typedef enum {
  dowInvalid,
  dowSunday,
  dowMonday,
  dowTuesday,
  dowWednesday,
  dowThursday,
  dowFriday,
  dowSaturday
} timeDayOfWeek_t;

typedef enum {
  tmSecond,
  tmMinute,
  tmHour,
  tmWday,
  tmDay,
  tmMonth,
  tmYear,
  tmNbrFields
} tmByteFields;

typedef struct {
  uint8_t Second;
  uint8_t Minute;
  uint8_t Hour;
  uint8_t Wday; // day of week, sunday is day 1
  uint8_t Day;
  uint8_t Month;
  uint8_t Year; // offset from 1970;
} tmElements_t, TimeElements, *tmElementsPtr_t;

// convenience macros to convert to and from tm years
#define tmYearToCalendar(Y) ((Y) + 1970) // full four digit year
#define CalendarYrToTm(Y) ((Y)-1970)
#define tmYearToY2k(Y) ((Y)-30) // offset is from 2000
#define y2kYearToTm(Y) ((Y) + 30)

typedef time_t (*getExternalTime)();
// typedef void  (*setExternalTime)(const time_t); // not used in this version

/*==============================================================================*/
/* Useful Constants */
#define SECS_PER_MIN ((time_t)(60UL))
#define SECS_PER_HOUR ((time_t)(3600UL))
#define SECS_PER_DAY ((time_t)(SECS_PER_HOUR * 24UL))
#define DAYS_PER_WEEK ((time_t)(7UL))
#define SECS_PER_WEEK ((time_t)(SECS_PER_DAY * DAYS_PER_WEEK))
#define SECS_PER_YEAR                                                          \
  ((time_t)(SECS_PER_DAY * 365UL))           // TODO: ought to handle leap years
#define SECS_YR_2000 ((time_t)(946684800UL)) // the time at the start of y2k

/* Useful Macros for getting elapsed time */
#define numberOfSeconds(_time_) ((_time_) % SECS_PER_MIN)
#define numberOfMinutes(_time_) (((_time_) / SECS_PER_MIN) % SECS_PER_MIN)
#define numberOfHours(_time_) (((_time_) % SECS_PER_DAY) / SECS_PER_HOUR)
#define dayOfWeek(_time_)                                                      \
  ((((_time_) / SECS_PER_DAY + 4) % DAYS_PER_WEEK) + 1) // 1 = Sunday
#define elapsedDays(_time_)                                                    \
  ((_time_) / SECS_PER_DAY) // this is number of days since Jan 1 1970
#define elapsedSecsToday(_time_)                                               \
  ((_time_) % SECS_PER_DAY) // the number of seconds since last midnight
// The following macros are used in calculating alarms and assume the clock is
// set to a date later than Jan 1 1971 Always set the correct time before
// settting alarms
#define previousMidnight(_time_)                                               \
  (((_time_) / SECS_PER_DAY) *                                                 \
   SECS_PER_DAY) // time at the start of the given day
#define nextMidnight(_time_)                                                   \
  (previousMidnight(_time_) + SECS_PER_DAY) // time at the end of the given day
#define elapsedSecsThisWeek(_time_)                                            \
  (elapsedSecsToday(_time_) +                                                  \
   ((dayOfWeek(_time_) - 1) * SECS_PER_DAY)) // note that week starts on day 1
#define previousSunday(_time_)                                                 \
  ((_time_)-elapsedSecsThisWeek(                                               \
      _time_)) // time at the start of the week for the given time
#define nextSunday(_time_)                                                     \
  (previousSunday(_time_) +                                                    \
   SECS_PER_WEEK) // time at the end of the week for the given time

/* Useful Macros for converting elapsed time to a time_t */
#define minutesToTime_t ((M))((M)*SECS_PER_MIN)
#define hoursToTime_t ((H))((H)*SECS_PER_HOUR)
#define daysToTime_t ((D))((D)*SECS_PER_DAY) // fixed on Jul 22 2011
#define weeksToTime_t ((W))((W)*SECS_PER_WEEK)

/*============================================================================*/
/*  time and date functions   */
int hour();                 // the hour now
int hour(time_t t);         // the hour for the given time
int hourFormat12();         // the hour now in 12 hour format
int hourFormat12(time_t t); // the hour for the given time in 12 hour format
uint8_t isAM();             // returns true if time now is AM
uint8_t isAM(time_t t);     // returns true the given time is AM
uint8_t isPM();             // returns true if time now is PM
uint8_t isPM(time_t t);     // returns true the given time is PM
int minute();               // the minute now
int minute(time_t t);       // the minute for the given time
int second();               // the second now
int second(time_t t);       // the second for the given time
#ifdef TIMELIB_ENABLE_MILLIS
int millisecond(); // the millisecond now
int microsecond();
#endif
int day();             // the day now
int day(time_t t);     // the day for the given time
int weekday();         // the weekday now (Sunday is day 1)
int weekday(time_t t); // the weekday for the given time
int month();           // the month now  (Jan is month 1)
int month(time_t t);   // the month for the given time
int year();            // the full four digit year: (2009, 2010 etc)
int year(time_t t);    // the year for the given time

time_t now(); // return the current time as seconds since Jan 1 1970
#ifdef TIMELIB_ENABLE_MILLIS
time_t now(uint32_t &sysTimeMicros); // return the current time as seconds and
                                     // microseconds since Jan 1 1970

#endif
#ifdef usePPS
void IRAM_ATTR SyncToPPS();
#endif
void setTime(time_t t);
void setTime(int hr, int min, int sec, int day, int month, int yr);
void adjustTime(long adjustment);

/* date strings */
#define dt_MAX_STRING_LEN                                                      \
  9 // length of longest date string (excluding terminating null)
char *monthStr(uint8_t month);
char *dayStr(uint8_t day);
char *monthShortStr(uint8_t month);
char *dayShortStr(uint8_t day);

/* time sync functions	*/
timeStatus_t
timeStatus(); // indicates if time has been set and recently synchronized
void setSyncProvider(
    getExternalTime getTimeFunction); // identify the external time provider
void setSyncInterval(
    time_t interval); // set the number of seconds between re-sync

/* low level functions to convert to and from system time                     */
void breakTime(time_t time, tmElements_t &tm); // break time_t into elements
time_t makeTime(const tmElements_t &tm); // convert time elements into time_t

} // extern "C++"
#endif // __cplusplus
#endif /* _Time_h */
