#include <WiFi.h>
#include "time.h"
#include <PubSubClient.h>
#include <LiquidCrystal_I2C.h>
#include <EEPROM.h>


#define NTP_SERVER "pool.ntp.org"        
#define UTC_OFFSET 3600         
#define UTC_OFFSET_DST 3600 

String kluc = "3AT";
String uzprosim;

struct tm badam; 


int den = 0;

const char* ssid     = "soc2019";
const char* password = "socka2019";
const char* mqtt_server = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);

LiquidCrystal_I2C lcd(0x27,  16, 2);

void getDay(){
  struct tm badam; 
if (!getLocalTime(&badam) ) 
  {
    Serial.println("Server nefachci");
    return;
  }
  den = badam.tm_wday;
}

void reconnect()
{
  while (!client.connected())
  {
    Serial.print("Nejsom pripojeny");
    String clientId = "TotoJeIdckoLOL";
    if (client.connect(clientId.c_str()))
    {
        Serial.println("pripojene...");
        client.subscribe("robo/testik");
        
    }
    else
    {
    Serial.print("nepripojene (3sek)...");
    delay(3000);
    }
}
}



void callback(char* topic, byte* payload, unsigned int length) {
  String uzprosim;
  for (int i = 0; i < length; i++) {
    uzprosim += (char)payload[i];
  }
  
  EEPROM.get(0, kluc);
  kluc.c_str();
  uzprosim.c_str();

  if(uzprosim[0] == kluc[0] && uzprosim[1] == kluc[1] && uzprosim[2] == kluc[2])
  {
    Serial.println(uzprosim[4]);
  den = (int)uzprosim[4]-48;
  Serial.println(den);
  vypis();
  }
}


void setup() {
  Serial.begin(9600);
  EEPROM.put(0, kluc);
  EEPROM.commit();
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  client.setServer(mqtt_server, 1883);
  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  reconnect();
  lcd.init();
  lcd.backlight();
  getDay();
  client.setCallback(callback);
}

void loop() {
  client.loop();
  vypis();
  delay(500);
  
}
void vypis(){
  lcd.clear();
  if(den == 6 or den == 0){
    lcd.print("HURA VOLNO");
  }
  else{
    lcd.setCursor(0,0);
    lcd.print("DO VIKENDU CHYBA");
    lcd.setCursor(0,1);
    int chyba = (6-den);
    lcd.print(chyba);
    lcd.print(" DNI");
}
}