Arduino led lights with photoresistor

const int DEFAULT_DELAY_SLICE = 10;
void setup()
{
  pinMode( 13 , OUTPUT);
  pinMode( 12 , OUTPUT);
  pinMode( 11 , OUTPUT);
  pinMode( 10 , OUTPUT);
  Serial.begin(9600);
}

void loop()
{
  changeStatusWithDelay(turnOn);
  changeStatusWithDelay(turnOff);
}

void changeStatusWithDelay(void (*f)(int))
{
  int totalPortDelay = 0;
  for (int port = 13; port >= 10; port--)
  {
    f( port );
    while(totalPortDelay < getDelayTime())
    {
      delay( DEFAULT_DELAY_SLICE );
      totalPortDelay += DEFAULT_DELAY_SLICE;
    }
    totalPortDelay = 0;
  }
}

void turnOn(int port) { digitalWrite( port , HIGH ); }
void turnOff(int port) { digitalWrite( port , LOW ); }

int getDelayTime()
{
  int delayTime = 20;
  int photo_voltage = analogRead(0) ;
  Serial.print("message");
  Serial.print(photo_voltage);
  Serial.println();
  if (photo_voltage > 0)
    delayTime = photo_voltage * 20;

  return delayTime;
}