const int flashButtonPin = 2;
const int turnOffButtonPin = 3;
const int ledPin = 13;

enum State {
  BLINKING,
  FLASHING,
  OFF
};

State currentState = BLINKING;
unsigned long previousMillis = 0;
const long interval = 500;
bool ledState = LOW;

void setup() {
  pinMode(flashButtonPin, INPUT_PULLUP);  // Use internal pull-up
  pinMode(turnOffButtonPin, INPUT_PULLUP);  // Use internal pull-up
  pinMode(ledPin, OUTPUT);
}

void loop() {
  bool flashButtonPressed = !digitalRead(flashButtonPin);
  bool turnOffButtonPressed = !digitalRead(turnOffButtonPin);

  switch (currentState) {
    case BLINKING:
      if (flashButtonPressed) {
        currentState = FLASHING;
      } else if (turnOffButtonPressed) {
        currentState = OFF;
      } else {
        unsigned long currentMillis = millis();
        if (currentMillis - previousMillis >= interval) {
          previousMillis = currentMillis;
          ledState = !ledState;
          digitalWrite(ledPin, ledState);
        }
      }
      break;

    case FLASHING:
      if (!flashButtonPressed) {
        currentState = BLINKING;
        ledState = LOW;
      } else {
        digitalWrite(ledPin, HIGH);
      }
      break;

    case OFF:
      if (!turnOffButtonPressed) {
        currentState = BLINKING;
        ledState = LOW;
      } else {
        digitalWrite(ledPin, LOW);
      }
      break;
  }
}