#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

const int upButton = 2;
const int downButton = 4;
const int selectButton = 1;
const int backButton = 3;
const int buzzerPin = 5;

int menu = 1;

void setup() {
  lcd.begin(16, 2);
  pinMode(upButton, INPUT_PULLUP);
  pinMode(downButton, INPUT_PULLUP);
  pinMode(selectButton, INPUT_PULLUP);
  pinMode(backButton, INPUT_PULLUP);
  pinMode(buzzerPin, OUTPUT);
}

void buzz() {
  tone(buzzerPin, 1000); // Set the buzzer to a frequency of 1000 Hz
  delay(100); // Adjust the delay time to control the beep duration
  noTone(buzzerPin); // Stop the buzzer
}

void handleBackButton() {
  buzz(); // Beep for the "back" button
  lcd.clear();

  if (menu > 1) {
    menu--;
  } else {
    menu = 10;
  }

  delay(200);
}

void loop() {
  lcd.clear();

  if (digitalRead(upButton) == LOW) {
    if (menu > 1) {
      menu--;
    } else {
      menu = 10;
    }
    delay(200);
    buzz();
  }

  if (digitalRead(downButton) == LOW) {
    if (menu < 10) {
      menu++;
    } else {
      menu = 1;
    }
    delay(200);
    buzz();
  }

  if (digitalRead(selectButton) == LOW) {
    buzz(); // Beep for the "select" button
    lcd.clear();

    switch (menu) {
      case 1:
        item1();
        break;
      case 2:
        item2();
        break;
      case 3:
        item3();
        break;
      case 4:
        item4();
        break;
      case 5:
        item5();
        break;
      case 6:
        item6();
        break;
      case 7:
        item7();
        break;
      case 8:
        item8();
        break;
      case 9:
        item9();
        break;
      case 10:
        item10();
        break;
    }

    delay(2000);

    while (digitalRead(backButton) != LOW) {}
    delay(200);

    lcd.clear();
    menu = 1;
    delay(200);
    return;
  }

  if (digitalRead(backButton) == LOW) {
    handleBackButton();
  }

  switch (menu) {
    case 1:
      lcd.print(">Item1");
      lcd.setCursor(0, 1);
      lcd.print(" Item2");
      break;
    case 2:
      lcd.print(" Item1");
      lcd.setCursor(0, 1);
      lcd.print(">Item2");
      break;
    case 3:
      lcd.print(">Item3");
      lcd.setCursor(0, 1);
      lcd.print(" Item4");
      break;
    case 4:
      lcd.print(" Item3");
      lcd.setCursor(0, 1);
      lcd.print(">Item4");
      break;
    case 5:
      lcd.print(">Item5");
      lcd.setCursor(0, 1);
      lcd.print(" Item6");
      break;
    case 6:
      lcd.print(" Item5");
      lcd.setCursor(0, 1);
      lcd.print(">Item6");
      break;
    case 7:
      lcd.print(">Item7");
      lcd.setCursor(0, 1);
      lcd.print(" Item8");
      break;
    case 8:
      lcd.print(" Item7");
      lcd.setCursor(0, 1);
      lcd.print(">Item8");
      break;
    case 9:
      lcd.print(">Item9");
      lcd.setCursor(0, 1);
      lcd.print(" Item10");
      break;
    case 10:
      lcd.print(" Item9");
      lcd.setCursor(0, 1);
      lcd.print(">Item10");
  }

  delay(100);
}

void item1() {
  // code for item1
  lcd.setCursor(0, 1);
  lcd.print("Item1");
}

void item2() {
  // code for item2
  lcd.setCursor(0, 1);
  lcd.print("Item2");
}

void item3() {
  // code for item3
  lcd.setCursor(0, 1);
  lcd.print("Item3");
}

void item4() {
  // code for item4
  lcd.setCursor(0, 1);
  lcd.print("Item4");
}

void item5() {
  // code for item5
  lcd.setCursor(0, 1);
  lcd.print("Item5");
}

void item6() {
  // code for item6
  lcd.setCursor(0, 1);
  lcd.print("Item6");
}

void item7() {
  // code for item7
  lcd.setCursor(0, 1);
  lcd.print("Item7");
}

void item8() {
  // code for item8
  lcd.setCursor(0, 1);
  lcd.print("Item8");
}

void item9() {
  // code for item9
  lcd.setCursor(0, 1);
  lcd.print("Item9");
}

void item10() {
  // code for item10
  lcd.setCursor(0, 1);
  lcd.print("Item10");
}