// For Manul mode codes


#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);   // I2C address: "0x3F" or "0x27"


const byte rightButtonPin = 13;
const byte leftButtonPin = 12;
const byte ledPin = 7; // for Manual mode



String MenuItems[] = {  // Your menu items
  "LED Switch"
};

void menuFunctions(int menu, byte right, byte left)  // Your menu functions
{
  if(menu == 1) // example function for 1. menu item
  {
    if(right == 1)
    {
      lcd.setCursor(0, 3);
      lcd.print("Off   ");
      lcd.setCursor(10, 3);
      lcd.print("On  <<");
      digitalWrite(ledPin, HIGH);
    }
    if(left == 1)
    {
      lcd.setCursor(0, 3);
      lcd.print("Off <<");
      lcd.setCursor(10, 3);
      lcd.print("On    ");
      digitalWrite(ledPin, LOW);
    }
  }
  
}

/***  do not modify  ***********************************************/
template< typename T, size_t NumberOfSize > 
size_t MenuItemsSize(T (&) [NumberOfSize]){ return NumberOfSize; }
int numberOfMenuItems = MenuItemsSize(MenuItems) - 1;
int currentMenuItem = 0;
int previousMenuItem = 1;
byte button_flag = 0;
unsigned long previousMillis = millis();
/*******************************************************************/

void setup()
{
 
  lcd.init();
  lcd.backlight();
  lcd.clear();

  pinMode(ledPin, OUTPUT);
  pinMode(rightButtonPin, INPUT_PULLUP);
  pinMode(leftButtonPin, INPUT_PULLUP);
  
}

void loop() 
{

    lcd.setCursor(0, 0);
    lcd.print("Menu Item:");
    lcd.setCursor(0, 1);
    lcd.print(MenuItems [currentMenuItem]);
    


  if(digitalRead(rightButtonPin) == LOW && button_flag == 0)
  {
    menuFunctions(currentMenuItem + 1, 1, 0);
    button_flag = 1;
    previousMillis = millis();
  }
  if(digitalRead(leftButtonPin) == LOW && button_flag == 0)
  {
    menuFunctions(currentMenuItem + 1, 0, 1);
    button_flag = 1;
    previousMillis = millis();
  }

  if(millis() - previousMillis >= 400) 
  {
    previousMillis = millis();
    button_flag = 0;
  }
}