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

#define RTC_SDA D1
#define RTC_SCL D2

const char  *ssid = "Wokwi-GUEST";
const char *pass = "";

RTC_DS1307 rtc;

WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "pool.ntp.org");

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

  // Initialize Wi-Fi
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, pass, 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  // Initialize RTC
  if (! rtc.begin()) {
    Serial.println("RTC module is NOT found");
    while (1);
  }

  // Initialize a NTPClient
  timeClient.begin();
  // Set offset time in seconds to adjust for your timezone, for example:
  // GMT +1 = 3600
  // GMT +8 = 28800
  // GMT -1 = -3600
  // GMT 0 = 0
  timeClient.setTimeOffset(28800);
  syncTime();
}

void loop() {
  DateTime now = rtc.now();
  Serial.print("RTC Date 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.dayOfTheWeek());
  Serial.print(") ");
  Serial.print(now.hour(), DEC);
  Serial.print(':');
  Serial.print(now.minute(), DEC);
  Serial.print(':');
  Serial.println(now.second(), DEC);
  delay(1000);
  delay(10); // this speeds up the simulation
}


void syncTime() {
  Serial.println("Time Syncing...");
  timeClient.update();
  unsigned long epochTime = timeClient.getEpochTime();
  struct tm *ptm = gmtime ((time_t *)&epochTime);

  rtc.adjust(
    DateTime(
      ptm->tm_year + 1900,
      ptm->tm_mon + 1, ptm->tm_mday,
      timeClient.getHours(),
      timeClient.getMinutes(),
      timeClient.getSeconds()
    )
  );
}