/*************************************************************************************************
                                      PROGRAMMINFO
**************************************************************************************************
Funktion: ESP32 Wetterdaten OLED-Display 1.3"
**************************************************************************************************



JSON-Meldung:
{"request":
  {"type":"City","query":"Tegernsee, Germany","language":"en","unit":"m"}
  ,"location":
  {"name":"Tegernsee","country":"Germany","region":"Bayern","lat":"47.717","lon":"11.767","timezone_id":"Europe\/Vienna","localtime":"2021-07-08 11:09","localtime_epoch":1625742540,"utc_offset":"2.0"}
  ,"current":
  {"observation_time":"09:09 AM","temperature":19,"weather_code":116,"weather_icons":["https:\/\/assets.weatherstack.com\/images\/wsymbols01_png_64\/wsymbol_0002_sunny_intervals.png"],"weather_descriptions":["Partly cloudy"],"wind_speed":7,"wind_degree":290,"wind_dir":"WNW","pressure":1020,"precip":0,"humidity":88,"cloudcover":75,"feelslike":19,"uv_index":3,"visibility":10,"is_day":"yes"}
  }
**************************************************************************************************
Version: 07.07.2021
**************************************************************************************************
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";


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("Aktualisierung ist auf 10 Sekunden eingestellt.");
}

void loop() {
  if ((millis() - lastTime) > timerDelay) {
    // Check WiFi Status
    if(WiFi.status()== WL_CONNECTED){
      String serverPath = "http://api.weatherstack.com/current?access_key=Hier deine API eintragen&query=Tegernsee";    //Hier deine API eintragen!

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

        if (JSON.typeof(myObject) == "undefined") {
        Serial.println("Eingabe fehlgeschlagen!");
        return;
      }

      Serial.print("JSON object = ");

      Serial.println("Meine Wetterdaten:");

      Serial.print("Ort: ");
      Serial.println(myObject["location"]["name"]);

      Serial.print("Aktuelle Temperatur: ");
      Serial.print(myObject["current"]["temperature"]);
      Serial.println("°C");

      Serial.print("Luftdruck: ");
      Serial.print(myObject["current"]["pressure"]);
      Serial.println("hPa");

      Serial.print("Luftfeuchte: ");
      Serial.print(myObject["current"]["humidity"]);
      Serial.println("%");

      Serial.print("Bewölkung: ");
      Serial.print(myObject["current"]["cloudcover"]);
      Serial.println("%");

      Serial.print("Windrichtung: ");
      Serial.println(myObject["current"]["wind_dir"]);

   }

    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 (200=OK): ");
    Serial.println(httpResponseCode);
    Serial.println("Server-Meldung: ");
    payload = http.getString();
  }
  else {
    Serial.print("Error code: ");
    Serial.println(httpResponseCode);
  }

  http.end();

  return payload;
}