#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // Initialize the LCD

float temp = 30;      // Example temperature value
float humidity = 24;  // Example humidity value

const int BUTTON_PIN = 7; // Tombol untuk lock/unlock
int buttonState = HIGH;   // State tombol saat ini
int lastButtonState = HIGH; // State tombol sebelumnya
unsigned long lastDebounceTime = 0; // Waktu terakhir tombol ditekan
const unsigned long debounceDelay = 50; // Debounce delay

// Menu variables
int currentMenu = 0; // Tracks the current menu
int totalMenus = 3;  // Total number of menus

// Timer variables
unsigned long previousMillis = 0; // Stores the last time the menu was updated
const long interval = 5000;       // Interval for changing the menu (5 seconds)

bool isLocked = false; // Status lock menu

void setup() {
  Serial.begin(9600);

  // Initialize the LCD
  lcd.init();
  lcd.backlight();

  // Display the first menu
  displayMenu(currentMenu);

  // Initialize the button
  pinMode(BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  unsigned long currentMillis = millis(); // Get the current time

  // Baca state tombol
  int reading = digitalRead(BUTTON_PIN);

  // Debounce tombol
  if (reading != lastButtonState) {
    lastDebounceTime = currentMillis;
  }

  if ((currentMillis - lastDebounceTime) > debounceDelay) {
    if (reading != buttonState) {
      buttonState = reading;

      // Jika tombol ditekan (LOW karena menggunakan INPUT_PULLUP)
      if (buttonState == LOW) {
        isLocked = !isLocked; // Toggle status lock
        // if (isLocked) {
        //   lcd.setCursor(0, 1);
        //   lcd.print("LOCKED        "); // Tampilkan status terkunci
        // } else {
        //   lcd.setCursor(0, 1);
        //   lcd.print("UNLOCKED      "); // Tampilkan status terbuka
        // }
      }
    }
  }

  lastButtonState = reading;

  // Jika tidak terkunci, lanjutkan perpindahan menu otomatis
  if (!isLocked) {
    if (currentMillis - previousMillis >= interval) {
      previousMillis = currentMillis; // Simpan waktu terakhir menu diubah

      // Pindah ke menu berikutnya
      currentMenu = (currentMenu + 1) % totalMenus;
      displayMenu(currentMenu);
    }
  }
}


// void loop() {
//   unsigned long currentMillis = millis(); // Get the current time

//   // Check if 5 seconds have passed
//   if (currentMillis - previousMillis >= interval) {
//     previousMillis = currentMillis; // Save the last time the menu was updated

//     // Move to the next menu
//     currentMenu = (currentMenu + 1) % totalMenus;
//     displayMenu(currentMenu);
//   }
// }

// Function to display the menu based on the currentMenu index
void displayMenu(int menuIndex) {
  lcd.clear(); // Clear the LCD before displaying new content

  switch (menuIndex) {
    case 0:
      lcd.setCursor(0, 0);
      lcd.print("Tm ");
      lcd.print(temp);
      lcd.setCursor(7,0);
      lcd.print("|Cd ");
      lcd.setCursor(0, 1);
      lcd.print("Hm ");
      lcd.print(humidity);
      lcd.setCursor(7,1);
      lcd.print("|Ph ");
      break;

    case 1:
      lcd.setCursor(0, 0);
      lcd.print("N ");
      lcd.print(temp);
      lcd.setCursor(7,0);
      lcd.print("|P ");
      lcd.setCursor(0, 1);
      lcd.print("K ");
      lcd.print(humidity);
      lcd.setCursor(7,1);
      lcd.print(" ");
      break;

    case 2:
      // Display a custom message
      lcd.setCursor(0, 0);
      lcd.print("Tegangan");
      lcd.setCursor(0, 1);
      lcd.print("Arus");
      break;

    default:
      lcd.setCursor(0, 0);
      lcd.print("Invalid Menu");
      break;
  }
}