const int greenLedPin = 12; // Green LED connected to pin 12
const int redLedPin = 10;   // Red LED connected to pin 10
const int buttonPin = 2;    // Momentary button connected to pin 2

bool isGreenOn = true;      // Tracks which LED is currently on
bool buttonState = false;   // Current state of the button
bool lastButtonState = false; // Last recorded state of the button

void setup() {
  pinMode(greenLedPin, OUTPUT);  // Set green LED pin as output
  pinMode(redLedPin, OUTPUT);    // Set red LED pin as output
  pinMode(buttonPin, INPUT);     // Set button pin as input

  // Start with green LED on
  digitalWrite(greenLedPin, HIGH);
  digitalWrite(redLedPin, LOW);
}

void loop() {
  buttonState = digitalRead(buttonPin); // Read the button state

  // Check for a button press (change from LOW to HIGH)
  if (buttonState == HIGH && lastButtonState == LOW) {
    // Toggle the LED state
    if (isGreenOn == true) {
      isGreenOn = false;
    } else {
      isGreenOn = true;
    }

    // Update LED states
    if (isGreenOn == true) {
      digitalWrite(greenLedPin, HIGH);
      digitalWrite(redLedPin, LOW);
    } else {
      digitalWrite(greenLedPin, LOW);
      digitalWrite(redLedPin, HIGH);
    }

    // Debounce delay
    delay(50);
  }

  // Update the last button state
  lastButtonState = buttonState;
}