/*******************************/
/*     VENDORS DEPENDENCIES    */
/*******************************/
// Install library "Low-Power" made by Rocket Scream Electronics
// Install library "RTClib" made by Adafruit
// Install library "DS3231" made by Andrew Wickert

/*******************************/
/*   CONFIGURATION VARIABLES   */
/*******************************/
#define DEBUG                       // Uncomment to enable logs

/*****************************************************************************************/
/*                              DO NOT EDIT BELOW THIS LINE                              */
/*****************************************************************************************/

/*******************************/
/*     Import dependencies     */
/*******************************/
#include <time.h>
#include <RTClib.h>
#ifndef DEBUG
#include "LowPower.h"
#endif

/*******************************/
/*       Global variables      */
/*******************************/
RTC_DS3231 rtc;

/*******************************/
/*        Setup function       */
/*******************************/
void setup() {
  Serial.begin(9600);
  Serial.println(F("Booting up"));

  // Assign pins
  pinMode(LED_BUILTIN, OUTPUT);

  // Turn LED on
  digitalWrite(LED_BUILTIN, HIGH);

  // Check RTC device is connected
  if (!rtc.begin()) {
    Serial.println(F("Couldn't find RTC"));
    Serial.flush();
    while (1) delay(10);
  }

  // Update time on power lost or on first boot
  if (rtc.lostPower()) {
    Serial.println(F("RTC lost power. Set time to compilation one"));
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // 13 Dec 2023 18:00:00
    // rtc.adjust(DateTime(2023, 12, 13, 18, 0, 0));
  }

  // Read today's date
  time_t now;
  DateTime utc = rtc.now();

  // Display today's date
  Serial.print(F("Now: "));
  Serial.print(utc.day(), DEC);
  Serial.print(F("/"));
  Serial.print(utc.month(), DEC);
  Serial.print(F("/"));
  Serial.print(utc.year(), DEC);
  Serial.print(F(" "));
  Serial.print(utc.hour(), DEC);
  Serial.print(F(":"));
  Serial.print(utc.minute(), DEC);
  Serial.print(F(":"));
  Serial.println(utc.second(), DEC);

  // Turn LED off
  digitalWrite(LED_BUILTIN, LOW);
}

void _sleep(uint16_t sleepInSeconds) {
#ifdef DEBUG
  delay(sleepInSeconds * 1000);
#else
  if (sleepInSeconds & 0x01) LowPower.powerDown(SLEEP_1S, ADC_OFF, BOD_OFF);
  if (sleepInSeconds & 0x02) LowPower.powerDown(SLEEP_2S, ADC_OFF, BOD_OFF);
  if (sleepInSeconds & 0x04) LowPower.powerDown(SLEEP_4S, ADC_OFF, BOD_OFF);

  while (sleepInSeconds & 0xFFF8) {
    sleepInSeconds = sleepInSeconds - 8;
    LowPower.powerDown(SLEEP_8S, ADC_OFF, BOD_OFF);
  }
#endif
}

void loop() {
  Serial.println("> Loop");
  
  // Turn LED ON
  digitalWrite(LED_BUILTIN, HIGH);
  delay(100);

  // Read current timestamp
  time_t now;
  DateTime utc = rtc.now();

#ifdef DEBUG
  // Display today's date
  Serial.print(F("Now: "));
  Serial.print(utc.day(), DEC);
  Serial.print(F("/"));
  Serial.print(utc.month(), DEC);
  Serial.print(F("/"));
  Serial.print(utc.year(), DEC);
  Serial.print(F(" "));
  Serial.print(utc.hour(), DEC);
  Serial.print(F(":"));
  Serial.print(utc.minute(), DEC);
  Serial.print(F(":"));
  Serial.println(utc.second(), DEC);
#endif

  // Turn LED OFF
  digitalWrite(LED_BUILTIN, LOW);

#ifdef DEBUG
  _sleep(10);
#else
  // Wake up every 10 minutes
  _sleep(6000);
#endif
}