#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"


#include <WiFi.h>
#include "time.h"



const char* ssid     = "Wokwi-GUEST";
const char* password = "";

const char* ntpServer = "3.cz.pool.ntp.org";
const long  gmtOffset_sec = 0;
const int   daylightOffset_sec = 3600;

unsigned long lastUpdateTime = 0; 
const unsigned long interval = 10000;

int currentScreen = 0;


#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
#define DHTTYPE DHT22

#define PIR 32
#define POT 35
#define LED 27
#define LEDW 26
#define RELAY 23
#define TEP 4
#define LDR 15
#define LED_TMP 19
#define TEMP_RELAY 18

int hodnota_potenciometr;
const float BETA = 3950; 
bool pohybDetekovan = false;
unsigned long posledniPohybTime = 0; 
const long intervalPohyb = 5000;

DHT dht(TEP, DHTTYPE);

void pohyb() {
 

  int val = digitalRead(PIR);
  if (val == HIGH) {
    pohybDetekovan = true;
    //Serial.println("Zaznamenán pohyb");
    posledniPohybTime = millis();  
  } else {
    pohybDetekovan = false;
    //Serial.println("Bez pohybu");
  }

   if (pohybDetekovan) {
    digitalWrite(LEDW, HIGH);  
    digitalWrite(RELAY, HIGH);
  }

 
  if (millis() - posledniPohybTime >= intervalPohyb) {
    digitalWrite(LEDW, LOW);
    digitalWrite(RELAY, LOW);
  }

  display.setCursor(0, 20);
  display.print("Pohyb: ");
  display.println(pohybDetekovan ? "ANO" : "NE");
}
void jas(){
  hodnota_potenciometr = analogRead(POT);
 // Serial.print("Hodnota potenciometru je: ");
  //Serial.println(hodnota_potenciometr);

  
  int jas = map(hodnota_potenciometr, 0, 4095, 0, 255);
  analogWrite(LED, jas);
  display.setCursor(0, 10);
  display.print("Potenciometr: ");
  display.println(hodnota_potenciometr);
}
void teplota(){

 float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  if (isnan(h) || isnan(t) || isnan(f)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }

  float hif = dht.computeHeatIndex(f, h);
  float hic = dht.computeHeatIndex(t, h, false);
/*
  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.print(F("°C "));
  Serial.print(f);
  Serial.print(F("°F  Heat index: "));
  Serial.print(hic);
  Serial.print(F("°C "));
  Serial.print(hif);
  Serial.println(F("°F"));
*/
  display.setCursor(0,30);
  display.print("Teplota: ");
  display.print(t);
  display.println(" C");
  if(t < 15 ){
  digitalWrite(TEMP_RELAY, HIGH);
  } else {
    digitalWrite(TEMP_RELAY, LOW);
  }

}

void setup() {
  Serial.begin(9600);
  dht.begin();
  pinMode(POT, INPUT);
  pinMode(PIR, INPUT);
  pinMode(TEP, INPUT);
  pinMode(LDR, INPUT);

  pinMode(LED, OUTPUT);
  pinMode(LEDW, OUTPUT);
  pinMode(RELAY, OUTPUT);
  pinMode(LED_TMP,OUTPUT);
  pinMode(TEMP_RELAY, OUTPUT);
  
  
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("OLED inicializace selhala"));
    for (;;);
  }

  
   Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected.");
  
  // Init and get the time
  configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
  printLocalTime();

  //disconnect WiFi as it's no longer needed
  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
  
}


void printLocalTime(){
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)){
    Serial.println("Failed to obtain time");
    return;
  }
  display.clearDisplay();
  display.setTextSize(1);        
  display.setTextColor(SSD1306_WHITE); 
  display.setCursor(0, 0);
  //display.println(&timeinfo, "%A,%B %d %Y %H:%M:%S");
  display.println(&timeinfo, "%A,%B %d");
  display.setTextSize(2); 
  display.setCursor(15,15);
  display.println(&timeinfo, "%H:%M:%S");
  char timeHour[3];
  strftime(timeHour,3, "%H", &timeinfo);
  char timeWeekDay[10];
  strftime(timeWeekDay,10, "%A", &timeinfo);
  display.display();
}


void loop() {
  pohyb();
  jas();
  teplota();
  screenchange();
  display.clearDisplay();
  display.setTextSize(1);        
  display.setTextColor(SSD1306_WHITE); 
  display.setCursor(0, 0);       
  display.println(F("Hello, ESP32!"));
  jas();
  pohyb();
  teplota();
  light();
  /*
  display.setCursor(0,40);
  display.print("Room: ");
  if (digitalRead(LDR) == LOW) {
    display.print("Zhasnuto");
    //Serial.println("Light!");
    digitalWrite(LED_TMP, LOW);
  } else {
    display.print("Rozsviceno");
    //Serial.println("Dark");
    digitalWrite(LED_TMP, HIGH);
  }
  display.display();
  */
}
  
 

void light() {
 pohyb();
 jas();
 teplota();
 display.setCursor(0,40);
  display.print("Room: ");
  if (digitalRead(LDR) == LOW) {
    display.print("Zhasnuto");
    //Serial.println("Light!");
    digitalWrite(LED_TMP, LOW);
  } else {
    display.print("Rozsviceno");
    //Serial.println("Dark");
    digitalWrite(LED_TMP, HIGH);
  }
  display.display();
}




void screenchange(){
   unsigned long currentMillis = millis();

    if (currentMillis - lastUpdateTime >= interval) {
        lastUpdateTime = currentMillis;
        currentScreen = (currentScreen + 1) % 2;

        display.clearDisplay();
        if (currentScreen == 0) {
            printLocalTime();
        } else {
           light(); 
        }
    }
}