#include <WiFi.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); 

#define NTP_SERVER     "pool.ntp.org"
#define UTC_OFFSET     3600
#define UTC_OFFSET_DST 3600 // posun o 1hod

struct tm cas;

bool firstState = true;

void setup() 
{
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();

  pinMode(34, INPUT_PULLUP);

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

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

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
}

void loop() 
{
  delay(500);

  if(digitalRead(34) == LOW && firstState == true){
    firstState = false;
    lcd.clear();
    vypisCas();
  }
  if(digitalRead(34) != LOW && firstState != true){
    firstState = true;
  
  }
}

void vypisCas() 
{
  if ( ! getLocalTime(&cas) ) 
  {
    Serial.println("PROBLEM SO ZISKANIM UDAJOV ZO SERVERU!");
    return;
  }

  lcd.home();
  lcd.println(&cas, "%H:%M:%S");
  lcd.setCursor(0,1);
  lcd.println(&cas, "%Y/%m/%d");
  //Serial.println(&cas, "%A, %B %d %Y %H:%M:%S");
 


}