#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <NTPClient.h>
#include <WiFiUdp.h>

// WiFi credentials
const char* ssid     = "your_SSID";
const char* password = "your_PASSWORD";

// Define NTP Client to get time
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "europe.pool.ntp.org", 10800, 60000); 
// 3rd param is timezone offset in seconds, adjust if needed
// 4th param is update time in millis

// Define LCD with I2C address 0x27 and size 20x4
LiquidCrystal_I2C lcd(0x27, 20, 4);

String weekDays[7]={"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

void setup() {
  // Initialize Serial Monitor
  Serial.begin(115200);
  
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  
  // Connect to Wi-Fi
  //WiFi.begin(ssid, password);
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  // Initialize NTP Client
  timeClient.begin();
}

void loop() {
  // Update the NTP client
  timeClient.update();

  //Serial.println(timeClient.getFormattedTime());
  
  // Get the current time
  unsigned long epochTime = timeClient.getEpochTime();
  struct tm *ptm = gmtime ((time_t *)&epochTime);
  
  // Format the time
  int hour = ptm->tm_hour;
  int minute = ptm->tm_min;
  int second = ptm->tm_sec;
  
  // Display the time on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  if(hour < 10) lcd.print('0');
  lcd.print(hour);
  lcd.print(":");
  if(minute < 10) lcd.print('0');
  lcd.print(minute);
  lcd.print(":");
  if(second < 10) lcd.print('0');
  lcd.print(second);
  
  // Display the date on the LCD
  int day = ptm->tm_mday;
  int month = ptm->tm_mon + 1;
  int dayWeek = ptm->tm_wday;
  //int year = ptm->tm_year + 1900;
  
  lcd.setCursor(0, 1);
  lcd.print("Date: ");
  if(day < 10) lcd.print('0');
  lcd.print(day);
  lcd.print("/");
  if(month < 10) lcd.print('0');
  lcd.print(month);
  lcd.print("  ");
  lcd.print(weekDays[dayWeek]);
  
  delay(1000); // Update every second
}