#include <LiquidCrystal.h>
#include <EEPROM.h>

// Inisialisasi LCD (rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);

const int relayPin = 7;
const int buzzerPin = 6;
const int upButton = 5;
const int downButton = 4;
const int setButton = 3;
const int resetButton = A0;

unsigned long countdownTime = 0;
unsigned long hourMeter = 0;
unsigned long startTime;
bool isRunning = false;
bool settingMode = true;
bool settingMinutes = true;
int setHours = 0;
int setMinutes = 1;

void setup() {
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(upButton, INPUT_PULLUP);
  pinMode(downButton, INPUT_PULLUP);
  pinMode(setButton, INPUT_PULLUP);
  pinMode(resetButton, INPUT_PULLUP);

  lcd.begin(16, 2);
  lcd.print("Set Time:");
  lcd.setCursor(0, 1);
  lcd.print(setHours);
  lcd.print(":");
  lcd.print(setMinutes);
  lcd.print(" H:M");

  EEPROM.get(0, hourMeter);
}

void loop() {
  if (digitalRead(setButton) == LOW) {
    delay(200); // Debounce delay
    if (settingMode) {
      settingMinutes = !settingMinutes;
      if (!settingMinutes) {
        countdownTime = (setHours * 3600 + setMinutes * 60) * 1000;
        lcd.clear();
        lcd.print("Set Time:");
        lcd.setCursor(0, 1);
        lcd.print(setHours);
        lcd.print(":");
        lcd.print(setMinutes);
        lcd.print(" H:M");
        delay(2000);
        lcd.clear();
        lcd.print("Timer Running");
        startTime = millis();
        isRunning = true;
        settingMode = false;
        digitalWrite(relayPin, HIGH);
      }
    }
  }

  if (settingMode) {
    if (settingMinutes) {
      if (digitalRead(upButton) == LOW) {
        delay(200); // Debounce delay
        setMinutes++;
        if (setMinutes >= 60) setMinutes = 0;
        lcd.setCursor(0, 1);
        lcd.print(setHours);
        lcd.print(":");
        lcd.print(setMinutes);
        lcd.print("   ");
      }

      if (digitalRead(downButton) == LOW) {
        delay(200); // Debounce delay
        if (setMinutes > 0) setMinutes--;
        lcd.setCursor(0, 1);
        lcd.print(setHours);
        lcd.print(":");
        lcd.print(setMinutes);
        lcd.print("   ");
      }
    } else {
      if (digitalRead(upButton) == LOW) {
        delay(200); // Debounce delay
        setHours++;
        lcd.setCursor(0, 1);
        lcd.print(setHours);
        lcd.print(":");
        lcd.print(setMinutes);
        lcd.print("   ");
      }

      if (digitalRead(downButton) == LOW) {
        delay(200); // Debounce delay
        if (setHours > 0) setHours--;
        lcd.setCursor(0, 1);
        lcd.print(setHours);
        lcd.print(":");
        lcd.print(setMinutes);
        lcd.print("   ");
      }
    }
  } else {
    if (isRunning) {
      unsigned long currentTime = millis();
      unsigned long elapsed = currentTime - startTime;

      if (elapsed >= countdownTime) {
        isRunning = false;
        digitalWrite(relayPin, LOW);
        digitalWrite(buzzerPin, HIGH);
        delay(1000);
        digitalWrite(buzzerPin, LOW);
        lcd.clear();
        lcd.print("Time's up!");
        delay(2000);
        lcd.clear();
        settingMode = true;
        hourMeter += countdownTime;
        EEPROM.put(0, hourMeter);
      } else {
        unsigned long remaining = countdownTime - elapsed;
        unsigned long remainingSeconds = remaining / 1000;
        unsigned long remainingMinutes = remainingSeconds / 60;
        unsigned long remainingHours = remainingMinutes / 60;
        remainingMinutes %= 60;
        remainingSeconds %= 60;
        lcd.setCursor(0, 0);
        lcd.print("Time Left:");
        delay(1000);
        lcd.setCursor(0, 1);
        lcd.print(remainingHours);
        lcd.print(":");
        lcd.print(remainingMinutes);
        lcd.print(":");
        lcd.print(remainingSeconds);
        lcd.print("   ");
      }
    }

    if (digitalRead(resetButton) == LOW) {
      delay(200); // Debounce delay
      hourMeter = 0;
      EEPROM.put(0, hourMeter);
      lcd.clear();
      lcd.print("Reset Hour Meter");
      delay(2000);
      lcd.clear();
    }
  }

  // Display Hour Meter
  unsigned long totalSeconds = hourMeter / 1000;
  unsigned long totalHours = totalSeconds / 3600;
  unsigned long totalMinutes = (totalSeconds % 3600) / 60;
  unsigned long totalSecondsRemain = totalSeconds % 60;
  lcd.setCursor(0, 0);
  lcd.print("H:");
  lcd.print(totalHours);
  lcd.print(" M:");
  lcd.print(totalMinutes);
  lcd.print(" S:");
  lcd.print(totalSecondsRemain);
  lcd.print("   ");
}