#include <LiquidCrystal.h>
#include <IRremote.h>

// Inisialisasi LCD dengan pin yang digunakan
const int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const int button1Pin = 2; // Push Button 1 untuk On/Off timer
const int button2Pin = 3; // Push Button 2 untuk Play/Pause timer

int timerRunning = 0; // Status Timer (0: Off, 1: On)
int timerPaused = 1;  // Status Timer (0: Play, 1: Pause)
unsigned long startTime;
unsigned long currentTime;
unsigned long elapsedTime = 3600; // 60 menit dalam detik

// Inisialisasi IR Receiver
#define PIN_RECEIVER 13   // Signal Pin of IR receiver
IRrecv receiver(PIN_RECEIVER);
decode_results results;

unsigned long lastIRTime = 0; // Waktu terakhir tombol IR ditekan
const unsigned long irDebounceDelay = 300; // Debounce delay untuk IR (300ms)

void setup() {
  pinMode(button1Pin, INPUT_PULLUP);
  pinMode(button2Pin, INPUT_PULLUP);
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Timer:");
  lcd.setCursor(0, 1);
  displayTime(elapsedTime);
  receiver.enableIRIn(); // Start the receiver
}

void loop() {
  static unsigned long lastDebounceTime1 = 0;
  static unsigned long lastDebounceTime2 = 0;
  unsigned long debounceDelay = 200;

  // IR Remote handling
  if (receiver.decode()) {
    unsigned long currentTime = millis();

    if ((currentTime - lastIRTime) > irDebounceDelay) {
      int command = receiver.decodedIRData.command; // variable receiver IR Remote command
      if (command == 162) { // Tombol ON/OFF IR
        Serial.println(command);
        toggleTimer();
      }
      if (command == 169) { // Tombol PLAY/PAUSE IR
        Serial.println(command);
        togglePause();
      }
      else {
        Serial.println("Command tidak ditemukan");
      }
      lastIRTime = currentTime; // Update waktu terakhir tombol ditekan
    }
    receiver.resume();
  }

  // Push Button handling
  if ((millis() - lastDebounceTime1) > debounceDelay && digitalRead(button1Pin) == LOW) {
    lastDebounceTime1 = millis();
    toggleTimer();
  }

  if ((millis() - lastDebounceTime2) > debounceDelay && digitalRead(button2Pin) == LOW) {
    lastDebounceTime2 = millis();
    togglePause();
  }

  // Timer running logic
  if (timerRunning == 1 && timerPaused == 0) {
    currentTime = millis();
    unsigned long remainingTime = elapsedTime - (currentTime - startTime) / 1000;

    if (remainingTime <= 0) {
      timerRunning = 0;
      remainingTime = 0;
    }

    lcd.setCursor(0, 1);
    displayTime(remainingTime);
  }
}

void toggleTimer() {
  if (timerRunning == 0) {
    timerRunning = 1;
    timerPaused = 1;
  } else {
    timerRunning = 0;
    elapsedTime = 3600; // Reset ke 60 menit
    lcd.setCursor(0, 1);
    displayTime(elapsedTime);
  }
  updateStatus();
}

void togglePause() {
  if (timerRunning == 1) {
    if (timerPaused == 1) {
      timerPaused = 0;
      startTime = millis();
    } else {
      timerPaused = 1;
      elapsedTime -= (millis() - startTime) / 1000;
    }
    updateStatus();
  }
}

void displayTime(unsigned long timeInSeconds) {
  unsigned long minutes = timeInSeconds / 60;
  unsigned long seconds = timeInSeconds % 60;

  lcd.setCursor(8, 0);
  if (minutes < 10) lcd.print("0");
  lcd.print(minutes);
  lcd.print(":");
  if (seconds < 10) lcd.print("0");
  lcd.print(seconds);
}

void updateStatus() {
  lcd.setCursor(0, 1);
  if (timerRunning == 1) {
    lcd.print("ON ");
  } else {
    lcd.print("OFF");
  }
  lcd.setCursor(4, 1);
  if (timerPaused == 1) {
    lcd.print("PAUSE");
  } else {
    lcd.print("PLAY ");
  }
}