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

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

#define NTP_SERVER     "th.pool.ntp.org"
#define UTC_OFFSET     7*3600
#define UTC_OFFSET_DST 0

const int LED = 13;

void printLocalTime() {
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    LCD.setCursor(0, 1);
    LCD.println("Connection Err");
    return;
  }

  LCD.setCursor(8, 0);
  LCD.println(String(timeinfo.tm_hour) + ":" + String(timeinfo.tm_min) + ":" + String(timeinfo.tm_sec));

  LCD.setCursor(0, 1);
  LCD.println(String(timeinfo.tm_mday) + "/" + String(timeinfo.tm_mon + 1) + "/" + String(timeinfo.tm_year + 1900)+" "+" "+"UTC");
}

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

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Connecting to ");
  LCD.setCursor(0, 1);
  LCD.print("WiFi ");

  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(250);

  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.println("Online");
  LCD.setCursor(0, 1);
  LCD.println("Updating time...");

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  pinMode(LED, OUTPUT);
}

void loop() {
  struct tm timeinfo;
  if (getLocalTime(&timeinfo)) {
    int currentSeconds = timeinfo.tm_sec;

    if (currentSeconds == 30 || currentSeconds == 0) {
      digitalWrite(LED, HIGH);
      delay(2000);
      digitalWrite(LED, LOW);
    }
  }

  printLocalTime();
  delay(250);
}