#include <WiFi.h>
#include <Wire.h>
#include <RTClib.h>
#include <WiFiUdp.h>
#include <NTPClient.h>

// Wi-Fi credentials
const char* ssid = ".";
const char* password = "1231231234";

// RTC object
RTC_DS3231 rtc;

// NTP client settings
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org", 19800, 60000); // IST offset: 5 hours 30 minutes

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

  // Initialize RTC
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }
  if (rtc.lostPower()) {
    Serial.println("RTC lost power, setting time...");
  }

  // Connect to Wi-Fi
  Serial.print("Connecting to Wi-Fi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected to Wi-Fi");

  // Initialize NTP client
  timeClient.begin();

  // Sync RTC with NTP
  syncRTCWithNTP();
}

void loop() {
  // Print time from RTC
  DateTime now = rtc.now();
  Serial.print("Current RTC 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.println(now.second(), DEC);

  delay(1000); // Update every second
}

// Function to sync RTC with NTP time
void syncRTCWithNTP() {
  timeClient.update();

  // Get time from NTP
  unsigned long epochTime = timeClient.getEpochTime();
  DateTime ntpTime = DateTime(epochTime);

  // Set RTC to NTP time
  rtc.adjust(ntpTime);

  Serial.println("RTC synchronized with NTP time.");
}