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

// Rotary Encoder and Switch Pins
#define encoderPinA 2
#define encoderPinB 3
#define switchPin 4

// LCD Setup
LiquidCrystal_I2C lcd(0x27, 16, 2); // Change the address if necessary

// Variables
volatile int encoderValue = 0;
int lastEncoded = 0;
boolean direction = false; // false = CW, true = CCW
boolean switchState = HIGH;
boolean lastSwitchState = HIGH;

void setup() {
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("Value: ");

  // Set up encoder and switch pins
  pinMode(encoderPinA, INPUT_PULLUP);
  pinMode(encoderPinB, INPUT_PULLUP);
  pinMode(switchPin, INPUT_PULLUP);

  // Attach interrupts for the encoder pins
  attachInterrupt(digitalPinToInterrupt(encoderPinA), updateEncoder, CHANGE);
  attachInterrupt(digitalPinToInterrupt(encoderPinB), updateEncoder, CHANGE);
}

void loop() {
  // Read switch state
  switchState = digitalRead(switchPin);

  // Check for switch press
  if (switchState != lastSwitchState) {
    delay(50); // debounce
    if (switchState == LOW) {
      // Switch is pressed
      lcd.clear();
      lcd.print("Setting Value");
      delay(1000); // Change value or perform action here
      lcd.clear();
      lcd.print("Value: ");
      lcd.print(encoderValue);
    }
    lastSwitchState = switchState;
  }
}

void updateEncoder() {
  int MSB = digitalRead(encoderPinA);
  int LSB = digitalRead(encoderPinB);

  int encoded = (MSB << 1) | LSB;
  int sum = (lastEncoded << 2) | encoded;

  if (sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) {
    direction = true; // CCW
  } else if (sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) {
    direction = false; // CW
  }

  if (direction) {
    encoderValue--;
  } else {
    encoderValue++;
  }

  lcd.setCursor(7, 0);
  lcd.print(encoderValue);

  lastEncoded = encoded;
}