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

#define COLUNAS 20 
#define LINHAS 4
#define LED 4

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

unsigned long int time_ms;
bool flag_inicializacao = 0; 
String atual, anterior = "";
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, "a.st1.ntp.br", -10800, 60000);
LiquidCrystal_I2C lcd(0x27, COLUNAS, LINHAS);

void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(115200);
  while(WiFi.status() != WL_CONNECTED){
    delay(500);
    lcd.setCursor(0,0);
    if(flag_inicializacao){
      lcd.print("Conectando....");
    } else {
      lcd.print("....");
    }
    Serial.print(".");
    flag_inicializacao = !flag_inicializacao;

  }
  Serial.println("\nConectado");
  Serial.println("IP: ");
  Serial.println(WiFi.localIP());
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Conectado!");
  lcd.setCursor(0,1);
  lcd.print("IP: ");
  lcd.print(WiFi.localIP());

  timeClient.begin();

}

void loop() {
  if(millis() - time_ms >= 1000){
    time_ms = millis();
    timeClient.update();
    atual = timeClient.getFormattedTime();
    digitalWrite(LED, !digitalRead(LED));

  }
  if(atual != anterior){
    anterior = atual;
    Serial.println(atual);
    lcd.setCursor(0,3);
    lcd.print(atual);
  }
}