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

LiquidCrystal_I2C lcd(0x3F, 16, 2); // I2C address and 16x2 display
Encoder encoder(6, 7);  // Rotary encoder pins

enum MenuOption {
  COUNTDOWN,
  SENSOR_DATA,
  LED_CONTROL,
  COUNTER,
  NUM_OPTIONS
};

int selectedOption = COUNTDOWN;

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("Select an option:");
  lcd.setCursor(0, 1);
  lcd.print("> Countdown");

  encoder.write(0); // Set the initial encoder value

  pinMode(8, INPUT_PULLUP); // Button pin
}

void loop() {
  int encoderValue = encoder.read();
  int newOption = map(encoderValue, -20, 20, 0, NUM_OPTIONS - 1);
  newOption = constrain(newOption, 0, NUM_OPTIONS - 1);

  if (newOption != selectedOption) {
    // Update the LCD to highlight the selected option
    lcd.setCursor(0, selectedOption);
    lcd.print(" ");
    lcd.setCursor(0, newOption);
    lcd.print(">");

    selectedOption = newOption;
  }

  if (digitalRead(8) == LOW) { // Button press
    delay(100); // Debounce
    handleSelection();
  }
}

void handleSelection() {
  lcd.clear();
  switch (selectedOption) {
    case COUNTDOWN:
      lcd.print("Countdown Timer");
      // Implement your countdown timer logic here
      break;

    case SENSOR_DATA:
      lcd.print("Sensor Data");
      // Implement your sensor data display logic here
      break;

    case LED_CONTROL:
      lcd.print("LED Control");
      // Implement your LED control logic here
      break;

    case COUNTER:
      lcd.print("Rotary Encoder");
      // Implement your rotary encoder counter logic here
      break;
  }
}