#include <WiFi.h>
#include <HTTPClient.h>
#include <Wire.h>
#include "Adafruit_SHT4x.h"
Adafruit_SHT4x sht4 = Adafruit_SHT4x();

String URL = "http://www.xxxxxxxxxx.cz/xxxxxxxxxx.php";

const char* ssid = "xxxxxxxx"; 
const char* password = "xxxxxxxxx"; 

//float temp = 0;
//float humidity = 0;
//char x [10];
//char y [10];

void setup() {
  Serial.begin(115200);
Wire.begin(19,18); // I2C sbernicce pro cidlo teploty a vlhkosti
  /*  NASTAVENI CIDLA TEPLOTY A VLHKOSTI  */
  sht4.begin(); // inicializace
  sht4.setPrecision(SHT4X_HIGH_PRECISION); // vysoka presnost mreni
  sht4.setHeater(SHT4X_NO_HEATER); // bez interniho ohrivace
  /*--------------------------------------*/
  
  connectWiFi();
}

void loop() {
  if(WiFi.status() != WL_CONNECTED) {
    connectWiFi();
  }

/* CIDLO TEPLOTY A VLHKOSTI */
  sensors_event_t humidity, temp;
  sht4.getEvent(&humidity, &temp); // cekani na aktualni data
  Serial.print("Teplota: "); Serial.print(temp.temperature); Serial.println(" stC");
  Serial.print("Vlhkost: "); Serial.print(humidity.relative_humidity); Serial.println("% rH");
  /*--------------------------*/

//dtostrf(temp.temperature, 6, 4, x);
//dtostrf(humidity.relative_humidity, 6, 4, y);
//String postData = "temperature=" + String(x) + "&humidity=" + String(y);

  String postData = "temperature=" + String(temp.temperature) + "&humidity=" + String(humidity.relative_humidity);
  
  HTTPClient http;
  http.begin(URL);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  
  int httpCode = http.POST(postData);
  String payload = http.getString();

  Serial.print("URL : "); Serial.println(URL); 
  Serial.print("Data: "); Serial.println(postData);
  Serial.print("httpCode: "); Serial.println(httpCode);
  Serial.print("payload : "); Serial.println(payload);
  Serial.println("--------------------------------------------------");
  delay(120000);
}

void connectWiFi() {
  WiFi.mode(WIFI_OFF);
  delay(1000);
  //This line hides the viewing of ESP as wifi hotspot
  WiFi.mode(WIFI_STA);
  
  WiFi.begin(ssid, password);
  Serial.println("Connecting to WiFi");
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
    
  Serial.print("connected to : "); Serial.println(ssid);
  Serial.print("IP address: "); Serial.println(WiFi.localIP());
}