const int redPin = 32;
const int yellowPin = 25;
const int greenPin = 14;
const int switchPin = 13;

bool sequenceStarted = false;

void setup() {
  Serial.begin(115200);
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(switchPin, INPUT_PULLUP); // Using internal pull-up resistor

  // Ensure all LEDs are off initially
  digitalWrite(redPin, LOW);
  digitalWrite(yellowPin, LOW);
  digitalWrite(greenPin, LOW);
}

void loop() {
  // Check if the switch is pressed to start the sequence
  if (digitalRead(switchPin) == HIGH) { // Inverted logic
    if (!sequenceStarted) {
      sequenceStarted = true;
    }
  } else {
    // Optionally, you can reset the sequenceStarted if the switch is not pressed
    sequenceStarted = false;
    
    // Ensure all LEDs are off if the switch is not pressed
    digitalWrite(redPin, LOW);
    digitalWrite(yellowPin, LOW);
    digitalWrite(greenPin, LOW);
  }

  if (sequenceStarted) {
    // Turn on LEDs in order: Red -> Yellow -> Green
    digitalWrite(redPin, HIGH);
    delay(1000);
    digitalWrite(redPin, LOW);
    
    digitalWrite(yellowPin, HIGH);
    delay(1000);
    digitalWrite(yellowPin, LOW);
    
    digitalWrite(greenPin, HIGH);
    delay(1000);
    digitalWrite(greenPin, LOW);
    
    // Turn on LEDs in reverse order: Green -> Yellow -> Red
    digitalWrite(greenPin, HIGH);
    delay(1000);
    digitalWrite(greenPin, LOW);
    
    digitalWrite(yellowPin, HIGH);
    delay(1000);
    digitalWrite(yellowPin, LOW);
    
    digitalWrite(redPin, HIGH);
    delay(1000);
    digitalWrite(redPin, LOW);

    // Small delay before starting the sequence again
    delay(500); // Optional, for a pause between sequences
  }
}