#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int vpot1 = A3;
const int vpot2 = A2;
const int button1 = 2;
const int button2 = 3;
const int ledPin = 4;
const int bzrPin = 5;

volatile bool isr1Active = false;
volatile bool isr2Active = false;
unsigned long isr1StartTime = 0;
unsigned long isr2StartTime = 0;

bool lcdPrinted = false;

void X1() {
  isr1Active = true;
  isr1StartTime = millis();
}

void X2() {
  isr2Active = true;
  isr2StartTime = millis();
}

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(bzrPin, OUTPUT);
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);

  attachInterrupt(digitalPinToInterrupt(button1), X1, FALLING);
  attachInterrupt(digitalPinToInterrupt(button2), X2, FALLING);

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("System Ready");
  delay(2000);
  lcd.clear();
}

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

  if (!isr1Active && !isr2Active && lcdPrinted) {
    lcd.clear();
    lcdPrinted = false;
  }

  // LOGIK UNTUK BUTTON 1 (ISR 1) - LED Menyala 7 saat (Ikut Lab Assessment)
  if (isr1Active && (currentTime - isr1StartTime < 7000)) { 
    digitalWrite(ledPin, HIGH);
    
    if (!lcdPrinted) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("LED ISR1 ON");
      lcd.setCursor(0, 1);
      lcd.print("7 Seconds");
      lcdPrinted = true;
    }
  }
  // LOGIK UNTUK BUTTON 2 (ISR 2) - Buzzer Berbunyi 6 saat
  else if (isr2Active && (currentTime - isr2StartTime < 6000)) {
    tone(bzrPin, 1000); // Guna tone supaya bunyi keluar di Wokwi
    
    if (!lcdPrinted) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("BZR ISR2 ON");
      lcd.setCursor(0, 1);
      lcd.print("6 Seconds");
      lcdPrinted = true;
    }
  }
  // KEADAAN ASAL / TAMAT TEMPOH - Papar Bacaan Potentiometer
  else {
    digitalWrite(ledPin, LOW);
    noTone(bzrPin); // Matikan tone buzzer dengan betul
    
    isr1Active = false;
    isr2Active = false;
    lcdPrinted = false; 

    // Mengekalkan kod paparan Potentiometer asal anda di bawah ini:
    int adc1 = analogRead(vpot1);
    float volt1 = (adc1 / 1023.0) * 2.5;
    int adc2 = analogRead(vpot2);
    float volt2 = (adc2 / 1023.0) * 5.0;

    lcd.setCursor(0, 0);
    lcd.print("POT1: ");
    lcd.print(volt1, 1);
    lcd.print("V, ");
    lcd.print(adc1);
    lcd.print("    ");

    lcd.setCursor(0, 1);
    lcd.print("POT2: ");
    lcd.print(volt2, 1);
    lcd.print("V, ");
    lcd.print(adc2);
    lcd.print("    ");
    
    delay(200); 
  }
}