#include <OneWire.h>
#include <DallasTemperature.h>
#define ONE_WIRE_BUS 5
OneWire oneWire(ONE_WIRE_BUS);	
DallasTemperature sensors(&oneWire);
#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 DS1307;

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int menuButtonPin = 2;
const int increaseButtonPin = 3;
const int decreaseButtonPin = 4;

enum MenuState { CLOCK, SET_HOUR, SET_MINUTE, SET_SECOND };
MenuState currentMenuState = CLOCK;

void setup() {
  lcd.backlight();
  lcd.begin(16, 2);
  sensors.begin();	// Start up the library
  Serial.begin(9600);
  DateTime datumCas = DS1307.now();

  if (!DS1307.begin()) {
    lcd.println("Hodiny nejsou pripojeny !");
    for (;;) ;
  }

  if (!DS1307.isrunning()) {
    lcd.println("Hodiny nejsou spusteny! Spoustim nyni..");
    DS1307.adjust(DateTime(__DATE__, __TIME__));
  }

  pinMode(menuButtonPin, INPUT_PULLUP);
  pinMode(increaseButtonPin, INPUT_PULLUP);
  pinMode(decreaseButtonPin, INPUT_PULLUP);
}

void adjustTime(DateTime &datumCas, int hours, int minutes, int seconds) {
  DateTime newTime = datumCas + TimeSpan(0, hours, minutes, seconds);
  DS1307.adjust(newTime);
}

void loop() {
  DateTime datumCas = DS1307.now();
//print the temperature in Celsius

  sensors.requestTemperatures(); 
  Serial.print("Temperature: ");
  Serial.print(sensors.getTempCByIndex(0));
  int temp=sensors.getTempCByIndex(0);
  Serial.print((char)176);//shows degrees character
  Serial.print("C  |  ");
  
  
  // Check button presses
  if (digitalRead(menuButtonPin) == LOW) {
    // Toggle the menu state
    currentMenuState = static_cast<MenuState>((currentMenuState + 1) % 4);
    delay(200); // Add a debounce delay
  }

  if (digitalRead(increaseButtonPin) == LOW) {
    // Depending on the menu state, adjust the time
    switch (currentMenuState) {
      case SET_HOUR:
        adjustTime(datumCas, 1, 0, 0); // Increase the hour by 1
        break;
      case SET_MINUTE:
        adjustTime(datumCas, 0, 1, 0); // Increase the minute by 1
        break;
      case SET_SECOND:
        adjustTime(datumCas, 0, 0, 1); // Increase the second by 1
        break;
      default:
        break;
    }
    delay(200); // Add a debounce delay
  }

  if (digitalRead(decreaseButtonPin) == LOW) {
    // Depending on the menu state, decrease the time
    switch (currentMenuState) {
      case SET_HOUR:
        adjustTime(datumCas, -1, 0, 0); // Decrease the hour by 1
        break;
      case SET_MINUTE:
        adjustTime(datumCas, 0, -1, 0); // Decrease the minute by 1
        break;
      case SET_SECOND:
        adjustTime(datumCas, 0, 0, -1); // Decrease the second by 1
        break;
      default:
        break;
    }
    delay(200); // Add a debounce delay
  }

  // Display the time
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Time: ");
  lcd.print(datumCas.hour());
  lcd.print(':');
  lcd.print(datumCas.minute());
  lcd.print(':');
  lcd.print(datumCas.second());
  lcd.setCursor(13, 1);
  lcd.print("T");
  lcd.setCursor(14, 1);
  lcd.println(temp);
  // Display the menu state
  lcd.setCursor(0, 1);
  switch (currentMenuState) {
    case CLOCK:
      lcd.print("Clock Mode   ");
      break;
    case SET_HOUR:
      lcd.print("Set Hour     ");
      break;
    case SET_MINUTE:
      lcd.print("Set Minute   ");
      break;
    case SET_SECOND:
      lcd.print("Set Second   ");
      break;
  }

  delay(1000);
}