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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the I2C address if necessary

enum Message {
  HELLO,
  WELCOME_TO_AAU,
  RTGP_SPRING_2024,
  MESSAGE_COUNT // Number of messages
};

volatile bool buttonPressed = false;
volatile Message currentMessage = HELLO;

void setup() {
  Serial.begin(9600); // Initialize serial communication
  while (!Serial);    // Wait for the serial monitor to open

  pinMode(2, INPUT_PULLUP); // Set pin 2 (INT0) as input with internal pull-up resistor

  attachInterrupt(digitalPinToInterrupt(2), buttonInterrupt, FALLING); // Attach interrupt to pin 2

  lcd.begin(16, 2); // Initialize LCD
  lcd.print("Hello!"); // Print initial message
}

void loop() {
  // Check if button is pressed
  if (buttonPressed) {
    // Increment current message
    currentMessage = static_cast<Message>((currentMessage + 1) % MESSAGE_COUNT);
    displayMessage(currentMessage); // Display message
    delay(500); // Debounce delay
    buttonPressed = false; // Reset buttonPressed flag
  }
}

void displayMessage(Message message) {
  lcd.clear(); // Clear the LCD screen

  // Print message based on enumeration
  switch (message) {
    case HELLO:
      lcd.print("Hello!");
      break;
    case WELCOME_TO_AAU:
      lcd.print("Welcome to AAU");
      break;
    case RTGP_SPRING_2024:
      lcd.print("RTGP Spring 2024");
      break;
    default:
      break;
  }
}

void buttonInterrupt() {
  buttonPressed = true; // Set buttonPressed flag
}