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

// Inisialisasi LCD I2C (alamat 0x27)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Tombol
const int btnStart = 5;  // Tombol MERAH
const int btnStop  = 6;  // Tombol BIRU

// LED indikator
const int ledRed    = 4;
const int ledYellow = 3;
const int ledBlue   = 2;

int state = 0; // 0 = standby, 1 = cooking, 2 = done

void setup() {
  lcd.begin(16, 2);  // <- FIXED: tambahkan ukuran LCD
  lcd.backlight();

  pinMode(btnStart, INPUT_PULLUP);
  pinMode(btnStop, INPUT_PULLUP);

  pinMode(ledRed, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledBlue, OUTPUT);

  tampilkanStandby();
}

void loop() {
  if (state == 0 && digitalRead(btnStart) == LOW) {
    delay(50);
    if (digitalRead(btnStart) == LOW) {
      state = 1;
      mulaiMemasak();
    }
  }

  if (state != 0 && digitalRead(btnStop) == LOW) {
    delay(50);
    if (digitalRead(btnStop) == LOW) {
      state = 2;
      tampilkanSelesai();
      delay(2000);
      tampilkanStandby();
      state = 0;
    }
  }
}

void mulaiMemasak() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Cooking...");

  digitalWrite(ledRed, HIGH);
  digitalWrite(ledYellow, LOW);
  digitalWrite(ledBlue, LOW);

  for (int i = 0; i <= 100; i++) {
    if (digitalRead(btnStop) == LOW) break;

    lcd.setCursor(0, 1);
    lcd.print("Progress: ");
    lcd.print(i);
    lcd.print("% ");
    delay(100);
  }

  state = 2;
  tampilkanSelesai();
  delay(2000);
  tampilkanStandby();
  state = 0;
}

void tampilkanStandby() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Microwave Ready");

  digitalWrite(ledRed, LOW);
  digitalWrite(ledYellow, LOW);
  digitalWrite(ledBlue, HIGH);
}

void tampilkanSelesai() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Cooking Done!");

  digitalWrite(ledRed, LOW);
  digitalWrite(ledYellow, HIGH);
  digitalWrite(ledBlue, LOW);
}