#include <LiquidCrystal.h>

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
const int buttonPin = 8; // The pin where the button is connected
const int buttonPin2 = 9;

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

unsigned long nextMillis = 0;
const long interval = 1000;
unsigned char sekunnit = 0;
unsigned char minuutit = 0;
unsigned char tunnit = 0;

bool settingTime = false; // Flag to indicate if we are in time setting mode

void setup() {
  lcd.begin(16, 2);
  lcd.print("Valtteri");
  lcd.setCursor(0, 1);
  lcd.print("  :  :");
  tulosta_luku_EtuNollalla(6, 1, sekunnit);
  tulosta_luku_EtuNollalla(3, 1, minuutit);
  tulosta_luku_EtuNollalla(0, 1, tunnit);

  pinMode(buttonPin, INPUT_PULLUP); // Set the button pin as input with internal pull-up resistor
  pinMode(buttonPin2, INPUT_PULLUP);
}

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

  // Check if it's time to update the clock
  if (currentMillis >= nextMillis && !settingTime) {
    nextMillis = currentMillis + interval;
    sekunnit++;
    if (sekunnit > 59) {
      sekunnit = 0;
      minuutit++;
      if (minuutit > 59) {
        minuutit = 0;
        tunnit++;
        if (tunnit > 23) {
          tunnit = 0;
        }
        tulosta_luku_EtuNollalla(0, 1, tunnit);
      }
      tulosta_luku_EtuNollalla(3, 1, minuutit);
    }
    tulosta_luku_EtuNollalla(6, 1, sekunnit);
  }

  // Check if the button is pressed to enter time setting mode
  if (digitalRead(buttonPin) == LOW) {
    settingTime = true;
    setTime();
  }
    else {
    settingTime = false;
    
  }
}

void tulosta_luku_EtuNollalla(unsigned char x, unsigned char y, unsigned char luku) {
  lcd.setCursor(x, y);
  if (luku < 10)
    lcd.print('0');
  lcd.print(luku);
}

void setTime() {
  static unsigned long lastDebounceTime = 0;  // Initialize debounce variables
  static unsigned long debounceDelay = 50;

  if (millis() - lastDebounceTime > debounceDelay) { // Check if it's time for debouncing
    if (digitalRead(buttonPin2) == LOW) { // Check if the button is pressed
      minuutit++; // Increment minutes
      if (minuutit >= 60) { // Check if minutes reach or exceed 60
        minuutit = 0;
        tunnit++;
        if (tunnit >= 24) { // Check if hours reach or exceed 24
          tunnit = 0;
        }
      }
      tulosta_luku_EtuNollalla(3, 1, minuutit); // Update the display with the new minutes
      tulosta_luku_EtuNollalla(0, 1, tunnit);   // Update the display with the new hours
      lastDebounceTime = millis(); // Save the last debounce time
    }
  }
}