#include <NTPClient.h>
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#ifndef STASSID
#define STASSID "MITAI2"
#define STAPSK "sstvsvl1"
#define OLED_RESET     -1 
#define SCREEN_ADDRESS 0x3C 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#include <DHT.h>
#define DHTPIN D1 
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
#endif
const char* ssid = STASSID;
const char* password = STAPSK;
bool vymena=true;
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP,"pool.ntp.org",3600);
unsigned long  prewievmillis=0,currentmillis;
String dni[7]={"Nedeľa","Pondelok","Utorok","Streda","Štvrtok","Piatok","Sobota"};
String mesiace[12]={"Január","Február","Marec","Apríl","Máj","Jún","Júl","August","September","Október","November","December,"};
float h;
float t;
void meraj(){
      t = dht.readTemperature();
      h = dht.readHumidity();
}
void zobraz() {
     display.setCursor(5,45);
     display.print(F("Teplota:"));
     display.print(t);
     display.println(F("C"));
     display.setCursor(5,55);
     display.print(F("VLhkost:"));
     display.print(h);
     display.println(F("%"));
}
void setup() {
Serial.begin(115200);
  Wire.begin(14,12);
   if(!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);//nekonečný loop
  }    
  delay(200);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  timeClient.begin();
  pinMode(0, OUTPUT);
  dht.begin();
  display.display();
  delay(2000);
  display.clearDisplay();    
}

void loop() {
 if(currentmillis-prewievmillis>=5000){
 currentmillis=millis(); 
 display.clearDisplay();
 display.drawRect(0,0,SCREEN_WIDTH - 1,SCREEN_HEIGHT -1,WHITE);
 if(vymena){
      time_t  epochTime = timeClient.getEpochTime();
     int den =timeClient.getDay();
     struct tm *ptm = gmtime ((time_t *)&epochTime); 
     int mesiac =ptm->tm_mon;
     int rok = ptm->tm_year+1900;
     int monthDay = ptm->tm_mday;
     timeClient.update();
       display.setTextSize(1);   
       display.setTextColor(SSD1306_WHITE);
       display.setCursor(5,10);
       display.println((String(ptm->tm_mday)+"."+mesiace[mesiac]+"."+(rok)+","+dni[den]));
       display.setCursor(5,25);
       display.println(timeClient.getFormattedTime());
 }     
 
else{
        display.setTextSize(1);   
       display.setTextColor(SSD1306_WHITE);
       meraj();
      zobraz();
      display.display();
}
 vymena=!vymena;  

 }
}