#include <WiFi.h>
#include <HTTPClient.h>
#include <ArduinoJson.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define OLED_RESET    -1
Adafruit_SSD1306 display(128, 64, &Wire, OLED_RESET);

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

const char* apiEndpoint = "http://api.openweathermap.org/data/2.5/weather?q=munich&appid=1e3c1094c33839191f343c88bf847cbc&units=metric";

const int buttonPin = 2; // GPIO2 als Eingang für den Taster

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  pinMode(buttonPin, INPUT_PULLUP); // Initialisiere den Taster-Pin als Eingang mit internem Pull-up-Widerstand

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.println("Bereit");
  display.display();
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  if(buttonState == LOW) { // Wenn der Taster gedrückt ist (niedrige Logikstufe)
    if(WiFi.status() == WL_CONNECTED){
      HTTPClient http;
      http.begin(apiEndpoint);
      int httpCode = http.GET();

      if(httpCode > 0){
          String payload = http.getString();
          DynamicJsonDocument doc(1024);
          deserializeJson(doc, payload);
          float temp = doc["main"]["temp"];
          String weather = doc["weather"][0]["main"];

          display.clearDisplay();
          display.setCursor(0,0);
          display.println("Temp: " + String(temp) + "C");
          display.println("Wetter: " + weather);
          display.display();
      } else {
          Serial.println("Error on HTTP request");
      }
      http.end();
    } else {
        display.clearDisplay();
        display.setCursor(0,0);
        display.println("WLAN nicht verbunden");
        display.display();
    }
    delay(500); // Entprellverzögerung
    while(digitalRead(buttonPin) == LOW); // Warte, bis der Taster losgelassen wird
  }
}