// Define the pin numbers for the buttons
const int greenbutton = 2; // Green Button connected to pin 2
const int redbutton = 3;   // Red Button connected to pin 3

// Define the pin numbers for the LEDs
const int greenLED = 4; // LED for Green Button connected to pin 4
const int redLED = 5;   // LED for Red Button connected to pin 5

// Variables to hold the button states
volatile bool greenbuttonPressed = false;
volatile bool redbuttonPressed = false;

// Variables to track LED states
bool greenLEDState = false; // State of the Green LED (ON/OFF)
bool redLEDState = false;   // State of the Red LED (ON/OFF)

void setup() {
  // Start the Serial communication
  Serial.begin(9600);
  
  // Set the button pins as input
  pinMode(greenbutton, INPUT_PULLUP);
  pinMode(redbutton, INPUT_PULLUP);

  // Set the LED pins as output
  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);

  // Turn off the LEDs initially
  digitalWrite(greenLED, LOW); // LED for Green Button OFF
  digitalWrite(redLED, LOW);   // LED for Red Button OFF

  // Attach interrupts to the button pins
  attachInterrupt(digitalPinToInterrupt(greenbutton), greenbuttonISR, FALLING);
  attachInterrupt(digitalPinToInterrupt(redbutton), redbuttonISR, FALLING);
}

void loop() {
  // Check if Green button was pressed
  if (greenbuttonPressed) {
    greenbuttonPressed = false; // Reset the flag
    greenLEDState = !greenLEDState; // Toggle the state of the Green LED
    digitalWrite(greenLED, greenLEDState ? HIGH : LOW); // Set LED state

    // If the Green LED is turned ON, turn OFF the Red LED
    if (greenLEDState) {
      redLEDState = false; // Update the state
      digitalWrite(redLED, LOW); // Turn off Red LED
      Serial.println("Green Button was pressed! LED ON");
    } else {
      Serial.println("Green Button was pressed again! LED OFF");
    }
  }

  // Check if Red button was pressed
  if (redbuttonPressed) {
    redbuttonPressed = false; // Reset the flag
    redLEDState = !redLEDState; // Toggle the state of the Red LED
    digitalWrite(redLED, redLEDState ? HIGH : LOW); // Set LED state

    // If the Red LED is turned ON, turn OFF the Green LED
    if (redLEDState) {
      greenLEDState = false; // Update the state
      digitalWrite(greenLED, LOW); // Turn off Green LED
      Serial.println("Red Button was pressed! LED ON");
    } else {
      Serial.println("Red Button was pressed again! LED OFF");
    }
  }
}

// Interrupt Service Routine for Green button
void greenbuttonISR() {
  greenbuttonPressed = true; // Set the flag for the Green button
}

// Interrupt Service Routine for Red button
void redbuttonISR() {
  redbuttonPressed = true; // Set the flag for the Red button
}