#pragma once

#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <time.h>

// See http://edwilliams.org/sunrise_sunset_algorithm.htm
#define ZENITH_OFFICIAL 90.83
#define ZENITH_CIVIL 96.0
#define ZENITH_NAUTICAL 102.0
#define ZENITH_ASTRONOMICAL 108.0

/* Given the latlong, returns the seconds in the day, in UTC, that the sun rises
 * on a given year-month-day, or 0 if it never rises.
 */
uint32_t calcSunRise(int year, int month, int day, float latitude, float longitude);

/* Given the latlong, returns the seconds in the day, in UTC, that the sun sets
 * on a given year-month-day, or 0 if it never sets.
 */
uint32_t calcSunSet(int year, int month, int day, float latitude, float longitude);

/* Given a month and hemisphere, a sunrise and sunset (output from
 * calcSun{Rise,Set}()), returns the amount of seconds of the day where
 * daylight is observed.
 * 
 * Is reasonably aware of polar regions (ie permanent day/night). Exception is the
 * first full day/night, which are truncated to 86400 respectively 0 seconds. This is
 * only a concern for any latitude > 66.6 or latitude < -66.6.
 */
uint32_t calcDaylight(int month, float latitude, uint32_t rise, uint32_t set);