#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.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

const char* apiKey = "26442cc5d88cc5516648ee2229e0f9e4";
const char* city = "Zilina";
String apiUrl = "http://api.openweathermap.org/data/2.5/weather?q=" + String(city) + "&appid=" + String(apiKey) + "&units=metric";

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

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

  Serial.println("\nWiFi pripojené!");
  Serial.print("IP adresa: ");
  Serial.println(WiFi.localIP());

  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  delay(100);
}

void loop() 
{
  if (WiFi.status() == WL_CONNECTED) 
  {
    HTTPClient http;
    http.begin(apiUrl.c_str());
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) 
    {
      String pocasie = http.getString();
      Serial.println(pocasie);

      // Parse JSON response
      StaticJsonDocument<1024> doc;
      DeserializationError error = deserializeJson(doc, pocasie);

      if (!error) 
      {
        float temperature = doc["main"]["temp"];
        Serial.print("Teplota: ");
        Serial.println(temperature);

        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Teplota: ");
        lcd.print(temperature);
        lcd.print(" C");
      } 
      else 
      {
        Serial.println("Chyba pri parsovani JSON");
      }
    } 
    else 
    {
      Serial.print("Problém so získaním údajov zo serveru: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } 
  else 
  {
    Serial.println("WiFi nie je pripojená.");
  }

  delay(60000); 
}