#include <Wire.h>
#include <RTClib.h>
#include <esp_deep_sleep.h>

RTC_DS1307 rtc;

const int WAKEUP_PIN = 19; // SQW pin connected to D19 on ESP32

void setup() {
  Serial.begin(9600);
  delay(1000); // Allow time for serial monitor to initialize
  
  pinMode(WAKEUP_PIN, INPUT_PULLUP); // Set the SQW pin as input with internal pull-up resistor
  
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  
  if (!rtc.isrunning()) {
    Serial.println("RTC is not running!");
    // Uncomment the next line if you want to set the RTC to the time this sketch was compiled
    // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
  
  printCurrentTime(); // Print current time before going to sleep
  
  // Calculate the time to wake up after 10 seconds
  DateTime now = rtc.now();
  DateTime wakeup = now + TimeSpan(0, 0, 0, 10); // Add 10 seconds
  
  // Set RTC alarm to wake up after 10 seconds
  rtc.setAlarm1(wakeup, DS1307_A1_Second); // Set alarm to trigger every 10 seconds
  
  // Enable alarm interrupt
  rtc.enableAlarm(1);
  
  // Sleep until the next alarm
  esp_deep_sleep_enable_ext0_wakeup((gpio_num_t)WAKEUP_PIN, 0); // Wake up when SQW pin goes low
  esp_deep_sleep_start();
}

void loop() {
  // This code won't be executed as ESP32 goes into deep sleep after setup
}

void printCurrentTime() {
  DateTime now = rtc.now();
  
  Serial.print("Current time: ");
  Serial.print(now.year(), DEC);
  Serial.print('/');
  Serial.print(now.month(), DEC);
  Serial.print('/');
  Serial.print(now.day(), DEC);
  Serial.print(" ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.print(now.second(), DEC);
  Serial.println();
}