/*
  Rui Santos & Sara Santos - Random Nerd Tutorials
  Complete project details at https://RandomNerdTutorials.com/esp32-ds1307-real-time-clock-rtc-arduino/
  Based on the RTClib Library examples: github.com/adafruit/RTClib/blob/master/examples
*/

// Date and time functions using a DS1307 RTC connected via I2C and Wire lib
#include "RTClib.h"

RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};

void setup () {
  Serial.begin(115200);

  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running, let's set the time!");
    // When time needs to be set on a new device, or after a power loss, the
    // following line sets the RTC to the date & time this sketch was compiled
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
    //rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
  }

  // When time needs to be re-set on a previously configured device, the
  // following line sets the RTC to the date & time this sketch was compiled
  //rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // This line sets the RTC with an explicit date & time, for example to set
  // January 21, 2014 at 3am you would call:
  //rtc.adjust(DateTime(2014, 1, 21, 3, 0, 0));
}

void loop () {
  // Get the current time from the RTC
  DateTime now = rtc.now();
  
  // Getting each time field in individual variables
  // And adding a leading zero when needed;
  String yearStr = String(now.year(), DEC);
  String monthStr = (now.month() < 10 ? "0" : "") + String(now.month(), DEC);
  String dayStr = (now.day() < 10 ? "0" : "") + String(now.day(), DEC);
  String hourStr = (now.hour() < 10 ? "0" : "") + String(now.hour(), DEC); 
  String minuteStr = (now.minute() < 10 ? "0" : "") + String(now.minute(), DEC);
  String secondStr = (now.second() < 10 ? "0" : "") + String(now.second(), DEC);
  String dayOfWeek = daysOfTheWeek[now.dayOfTheWeek()];

  // Complete time string
  String formattedTime = dayOfWeek + ", " + yearStr + "-" + monthStr + "-" + dayStr + " " + hourStr + ":" + minuteStr + ":" + secondStr;

  // Print the complete formatted time
  Serial.println(formattedTime);

  Serial.println();
  delay(3000);
}