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

// Initialize LCD (Address 0x27 is standard, try 0x3F if text doesn't appear)
LiquidCrystal_I2C lcd(0x27, 16, 2); 

const int signalPin = A0; // The Signal Output Pin (Middle Pin)

void setup() {
  lcd.init();
  lcd.backlight();
  
  // Professional Boot Sequence for Intern Report
  lcd.setCursor(0, 0);
  lcd.print("BREADBOARD-FREE");
  lcd.setCursor(0, 1);
  lcd.print("MENU SYSTEM v1.0");
  delay(2000);
  lcd.clear();
}

void loop() {
  // Read the Signal Output Pin (0 to 1023)
  int knobValue = analogRead(signalPin);

  // Divide the 1024 range into 3 Menu Pages
  
  // --- PAGE 1: 0 to 340 ---
  if (knobValue < 341) {
    lcd.setCursor(0, 0);
    lcd.print("> SYSTEM STATUS "); 
    lcd.setCursor(0, 1);
    lcd.print("State: ACTIVE   ");
  } 
  
  // --- PAGE 2: 341 to 682 ---
  else if (knobValue >= 341 && knobValue < 682) {
    lcd.setCursor(0, 0);
    lcd.print("> MOMO   ");
    lcd.setCursor(0, 1);
    lcd.print("Chowmein: ");
    lcd.print(knobValue);
    lcd.print("   "); // Spaces clear old digits
  } 
  
  // --- PAGE 3: 683 to 1023 ---
  else {
    lcd.setCursor(0, 0);
    lcd.print("> Pizza  ");
    // Map the signal to a percentage for the user
    int percent = map(knobValue, 683, 1023, 0, 100);
    lcd.setCursor(0, 1);
    lcd.print("Level: ");
    lcd.print(percent);
    lcd.print("%       ");
  }

  delay(100); // Prevents LCD "ghosting" or flickering
}