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/*
* mars_clock.c
*
* Created: 4/29/2021 11:36:26 PM
* Author: joeycastillo
*/
#include <stdio.h>
#include <math.h>
#include "mars_clock.h"
static unsigned short days[4][12] =
{
{ 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335},
{ 366, 397, 425, 456, 486, 517, 547, 578, 609, 639, 670, 700},
{ 731, 762, 790, 821, 851, 882, 912, 943, 974,1004,1035,1065},
{1096,1127,1155,1186,1216,1247,1277,1308,1339,1369,1400,1430},
};
unsigned int date_time_to_epoch(struct calendar_date_time date_time)
{
unsigned int second = date_time.time.sec;
unsigned int minute = date_time.time.min;
unsigned int hour = date_time.time.hour;
unsigned int day = date_time.date.day-1; // 0-30
unsigned int month = date_time.date.month-1; // 0-11
unsigned int year = date_time.date.year - 1970; // 0-99
return (((year/4*(365*4+1)+days[year%4][month]+day)*24+hour)*60+minute)*60+second;
}
void epoch_to_date_time(struct calendar_date_time date_time, unsigned int epoch)
{
date_time.time.sec = epoch % 60;
epoch /= 60;
date_time.time.min = epoch % 60;
epoch /= 60;
date_time.time.hour = epoch % 24;
epoch /= 24;
unsigned int years = epoch/(365*4+1)*4;
epoch %= 365*4+1;
unsigned int year;
for (year=3; year>0; year--)
{
if (epoch >= days[year][0])
break;
}
unsigned int month;
for (month=11; month>0; month--)
{
if (epoch >= days[year][month])
break;
}
date_time.date.year = years+year;
date_time.date.month = month+1;
date_time.date.day = epoch-days[year][month]+1;
}
void h_to_hms(struct calendar_date_time *date_time, double h) {
unsigned int seconds = (unsigned int)(h * 3600.0);
date_time->time.hour = seconds / 3600;
seconds = seconds % 3600;
date_time->time.min = floor(seconds / 60);
date_time->time.sec = round(seconds % 60);
}
void update_display(Watch *watch, struct calendar_date_time date_time, bool local) {
char buf[6];
if (local) {
sprintf(&buf[0], "TE %02d%02d%02d", date_time.time.hour, date_time.time.min, date_time.time.sec);
} else {
unsigned int now = date_time_to_epoch(date_time);
double jdut = 2440587.5 + ((double)now / 86400.0);
double jdtt = jdut + ((37.0 + 32.184) / 86400.0);
double jd2k = jdtt - 2451545.0;
double msd = ((jd2k - 4.5) / 1.0274912517) + 44796.0 - 0.0009626;
double mtc = fmod(24 * msd, 24);
struct calendar_date_time mars_time;
h_to_hms(&mars_time, mtc);
sprintf(&buf[0], "MA %02d%02d%02d", mars_time.time.hour, mars_time.time.min, mars_time.time.sec);
}
watch_display_string(watch, buf, 0);
}
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