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) {
    isGreenOn = !isGreenOn; // Toggle the LED state

    // Update LED states
    digitalWrite(greenLedPin, isGreenOn ? HIGH : LOW);
    digitalWrite(redLedPin, isGreenOn ? LOW : HIGH);

    // Debounce delay
    delay(50);
  }

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