/*************************************************************************************************
                                      PROGRAMMINFO
**************************************************************************************************
Funktion: ESP32 WWetterdaten
**************************************************************************************************
Version: 05.07.2021
**************************************************************************************************
Board: ESP32vn IoT UNO V1.0.4
**************************************************************************************************
C++ Arduino IDE V1.8.13
**************************************************************************************************
Einstellungen:
https://dl.espressif.com/dl/package_esp32_index.json
http://dan.drown.org/stm32duino/package_STM32duino_index.json
https://raw.githubusercontent.com/espressif/arduino-esp32/gh-pages/package_esp32_dev_index.json
 **************************************************************************************************/

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

const char* ssid = "xxx";
const char* password = "xxx";

String openWeatherMapApiKey = "Hier deinen API eintragen";
String city = "Tegernsee";
String countryCode = "DE";

unsigned long lastTime = 0;
// Timer set to 10 Minuten (600000)
//unsigned long timerDelay = 600000;
// Set timer to 10 Sekunden (10000)
unsigned long timerDelay = 10000;

String jsonBuffer;

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

  WiFi.begin(ssid, password);
  Serial.println("Verbinde");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Verbunden mit IP Addresse: ");
  Serial.println(WiFi.localIP());

  Serial.println("Timer ist auf 10 Sekunden eingestellt.");
}

void loop() {
  if ((millis() - lastTime) > timerDelay) {
    // Check WiFi Status
    if(WiFi.status()== WL_CONNECTED){
      String serverPath = "http://api.openweathermap.org/data/2.5/weather?q=" + city + "," + countryCode + "&APPID=" + openWeatherMapApiKey;

      jsonBuffer = httpGETRequest(serverPath.c_str());
      Serial.println(jsonBuffer);
      JSONVar myObject = JSON.parse(jsonBuffer);

        if (JSON.typeof(myObject) == "undefined") {
        Serial.println("Eingabe fehlgeschlagen!");
        return;
      }
      ktemp=(myObject["main"]["temp"]);
//      Serial.print("JSON object = ");
      Serial.println("Meine Wetterdaten");
      Serial.print("Ort: ");
      Serial.println(myObject["name"]);
      Serial.print("Temperatur: ");
//      Serial.println(myObject["main"]["temp"]);
      Serial.print(ktemp-273);
      Serial.println(" °C ");
      Serial.print("Luftdruck: ");
      Serial.print(myObject["main"]["pressure"]);
      Serial.println(" hPa");
      Serial.print("Luftfeuchte: ");
      Serial.print(myObject["main"]["humidity"]);
      Serial.println(" % ");
      Serial.print("Wind Geschwindigkeit: ");
      Serial.print(myObject["wind"]["speed"]);
      Serial.println(" m/s ");
    }

    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
}

String httpGETRequest(const char* serverName) {
  WiFiClient client;
  HTTPClient http;

  // Domain-Name
  http.begin(client, serverName);

  // HTTP POST request 200=OK
  int httpResponseCode = http.GET();

  String payload = "{}";

  if (httpResponseCode>0) {
    Serial.print("HTTP-Antwort Code: ");
    Serial.println(httpResponseCode);
    payload = http.getString();
  }
  else {
    Serial.print("Error code: ");
    Serial.println(httpResponseCode);
  }

  http.end();

  return payload;
}