#include "SPI.h"
#include "Adafruit_GFX.h"
#include "Adafruit_ILI9341.h"
#include <DHT.h>


// rtc
#include <Wire.h>
#include <RTClib.h>
//tipke
#define LB 6
#define RB 5
#define U 4
#define L 3
#define R 2
#define D 1

RTC_DS3231 rtc;
int hour, minute, second;

// dht
#define DHTPIN 7
#define DHTTYPE DHT22   

#define TFT_DC 9
#define TFT_CS 10
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC);
DHT dht(DHTPIN, DHTTYPE);

float lastTemp = 1.0;
float temp = dht.readTemperature();

// timer
unsigned long previousTempMillis = 0;
unsigned long previousClockMillis = 0;

// update intervals
const long tempInterval = 200;
const long clockInterval = 1000;

bool defbar = false;
int hms = 0;

void setup() {
  pinMode(LB, INPUT_PULLUP);
  pinMode(RB, INPUT_PULLUP);
  pinMode(U, INPUT_PULLUP);
  pinMode(L, INPUT_PULLUP);
  pinMode(R, INPUT_PULLUP);

  dht.begin();
  tft.begin();

  Serial.begin(9600);
  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, setting the time!");
    // Set the time to a default value (e.g., 00:00:00)
    rtc.adjust(DateTime(0, 1, 1, 0, 0, 0)); // Year, Month, Day, Hour, Minute, Second
  }
  resetBar();
}

void loop() {
  int setup = digitalRead(LB);
  if (setup == LOW) 
  {
    //Serial.print("setup"); 
    delay(80);

    defbar = false;
    hms = 0; //nastavitev časa h/m/s
    DateTime now = rtc.now();
    hour = now.hour();
    minute = now.minute();
    second = now.second();

    tft.fillRect(0, 280, 240, 40, ILI9341_RED);
    tft.setCursor(0, 286);
    tft.setTextColor(ILI9341_GREEN);
    tft.setTextSize(3);
    tft.print("SAVE");
    tft.setCursor(125, 286);
    tft.print("H/M/S");


    while (digitalRead(LB) == HIGH) {
      //Serial.print("inside");
      delay(80);

      if (digitalRead(RB) == LOW) {
        if (hms == 2) {
          hms = 0;
        }
        else {
          hms = hms + 1;
        }
        Serial.print(hms);
      }
      if (digitalRead(R) == LOW) {
        if (hms == 0) {
          hour = hour + 1;
        }
        if (hms == 1) {
          minute = minute + 1;
        }
        if (hms == 2) {
          second = second + 1;
        }
        rtc.adjust(DateTime(now.year(), now.month(), now.day(), hour, minute, second));

      }

      
    }
  }
  resetBar();
  unsigned long currentMillis = millis();

  // Temp sprememba
  if (currentMillis - previousTempMillis >= tempInterval) {
    previousTempMillis = currentMillis;
    
    temp = dht.readTemperature();
    if (abs(temp - lastTemp) >= 0.5) {
      tft.fillRect(10, 10, 50, 30, ILI9341_BLACK);
      tft.setCursor(10, 10);
      tft.setTextColor(ILI9341_RED);
      tft.setTextSize(2);
      tft.println(temp, 1);

      tft.setCursor(60, 10);
      tft.setTextColor(ILI9341_GREEN);
      tft.print(" ");
      tft.print((char)247);
      tft.print("C");
      lastTemp = temp;
    }
    
    // Serial nastavitev časa
    if (Serial.available() > 0) {
      String input = Serial.readStringUntil('\n');
      adjustTime(input);
    }
  }

  // posodobitev časa
  if (currentMillis - previousClockMillis >= clockInterval) {
    previousClockMillis = currentMillis;
    
    DateTime now = rtc.now();
    
    // izpis casa
    tft.fillRect(0, 50, 300, 98, ILI9341_BLACK);
    tft.setCursor(0, 50);
    tft.setTextColor(ILI9341_RED);
    tft.setTextSize(5);

    tft.print(now.hour(), DEC);
    tft.print(':');
    tft.print(now.minute(), DEC);
    tft.print(':');
    tft.print(now.second(), DEC);

  }
}

void adjustTime(String input) {
  // format: HH:MM:SS
  if (input.length() == 8) {
    int hour = input.substring(0, 2).toInt();
    int minute = input.substring(3, 5).toInt();
    int second = input.substring(6, 8).toInt();

    DateTime now = rtc.now();
    rtc.adjust(DateTime(now.year(), now.month(), now.day(), hour, minute, second));
    Serial.println("Time updated!");
  } else {
    Serial.println("Invalid format. Use HH:MM:SS");
  }
}

void resetBar() {
  if (!defbar){
    tft.fillRect(0, 280, 240, 40, ILI9341_RED);
    tft.setCursor(0, 286);
    tft.setTextColor(ILI9341_GREEN);
    tft.setTextSize(3);
    tft.print("SET");
    defbar = true;
  }  
}