// constants won't change
const int BUTTON_PIN = 7; // Arduino pin connected to button's pin
const int LED_PIN    = 3; // Arduino pin connected to LED's pin

// variables will change:
int ledState = LOW;       // the current state of LED
int lastButtonState;      // the previous state of button
int currentButtonState;   // the current state of button
bool buttonPressed = false; // to track button press

void setup() {
  Serial.begin(9600);                // initialize serial
  pinMode(BUTTON_PIN, INPUT_PULLUP); // set arduino pin to input pull-up mode
  pinMode(LED_PIN, OUTPUT);          // set arduino pin to output mode

  currentButtonState = digitalRead(BUTTON_PIN);
  lastButtonState = currentButtonState;
}

void loop() {
  lastButtonState = currentButtonState;      // save the last state
  currentButtonState = digitalRead(BUTTON_PIN); // read new state

  // Detect button press (transition from HIGH to LOW)
  if (lastButtonState == HIGH && currentButtonState == LOW) {
    // Simple debounce - wait a bit to confirm the press
    delay(50);
    currentButtonState = digitalRead(BUTTON_PIN);
    if (currentButtonState == LOW) { // confirmed press
      buttonPressed = true;
    }
  }

  // Only toggle LED when button is released (LOW to HIGH)
  if (buttonPressed && currentButtonState == HIGH && lastButtonState == LOW) {
    ledState = !ledState; // toggle LED state
    digitalWrite(LED_PIN, ledState);
    
    Serial.print("Button released. LED is now ");
    Serial.println(ledState == HIGH ? "ON" : "OFF");
    
    buttonPressed = false; // reset flag
  }
}