#define EAST 3
#define WEST 13


int direction = EAST;
int requestedDirection = EAST;

void setup() {
  // put your setup code here, to run once:
pinMode(0, OUTPUT);
pinMode(1, OUTPUT);
pinMode(2, OUTPUT);

pinMode(10, OUTPUT);
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);

pinMode(EAST, INPUT);
pinMode(WEST, INPUT);

digitalWrite(EAST-3, HIGH);
digitalWrite(WEST-1, HIGH);

}

void processLightRequest() {
    if (direction != requestedDirection) {
      delay(2000);
      digitalWrite(direction-3, LOW);
      digitalWrite(direction-2, HIGH);
      delay(3000);
      digitalWrite(direction-2, LOW);
      digitalWrite(direction-1, HIGH);
      delay(1000);

      direction = requestedDirection;
      digitalWrite(direction-2, HIGH);
      digitalWrite(direction-1, LOW);
      delay(3000);
      digitalWrite(direction-3, HIGH);
      digitalWrite(direction-2, LOW);
    }
  }

void loop() {
  // put your main code here, to run repeatedly:

  if ((digitalRead(EAST) == HIGH)){
     requestedDirection = EAST;
     processLightRequest();
  }

  if (digitalRead(WEST) == HIGH) {
      requestedDirection = WEST;
      processLightRequest();
    }

}