const int RED_SIGNAL = 25;
const int YELLOW_SIGNAL = 26;
const int GREEN_SIGNAL = 27;

const int RED_SIGNAL_PERSON = 18;
const int GREEN_SIGNAL_PERSON = 19;

const int BUTTON = 21;

const int SECONDS = 13;
const int DELAY_VALUE = 500;

void setup() {
  Serial.begin(115200);

  pinMode(RED_SIGNAL, OUTPUT);
  pinMode(YELLOW_SIGNAL, OUTPUT);
  pinMode(GREEN_SIGNAL, OUTPUT);

  pinMode(RED_SIGNAL_PERSON, OUTPUT);
  pinMode(GREEN_SIGNAL_PERSON, OUTPUT);
  
  pinMode(BUTTON, INPUT);

  lower(RED_SIGNAL);
  lower(YELLOW_SIGNAL);
  lower(GREEN_SIGNAL);

  lower(RED_SIGNAL_PERSON);
  lower(GREEN_SIGNAL_PERSON);

  Serial.println("LIBERADO PARA O MOTORISTA");
}

void lower(int led) {
  digitalWrite(led, LOW);
}

void higher(int led) {
  digitalWrite(led, HIGH);
}

void higher(int led1, int led2) {
  higher(led1);
  higher(led2);
}

void lowerHigher(int led1, int led2) {
  lower(led1);
  higher(led2);
}

void blink(int quantity){  
  higher(GREEN_SIGNAL_PERSON);
  delay(DELAY_VALUE);
  lower(GREEN_SIGNAL_PERSON);
  delay(DELAY_VALUE);
  
  Serial.println((String) "ATENÇÃO PEDESTRE, O SINAL VAI FECHAR EM " + quantity + " SEGUNDO" + (quantity > 1 ? "S" : " "));
  if (quantity - 1 > 0) blink(quantity - 1);
  else delay(DELAY_VALUE * 2);
}

void loop() {
  Serial.println((String)"Valor: " + digitalRead(BUTTON));

  while(digitalRead(BUTTON) == 1){
    higher(RED_SIGNAL_PERSON, GREEN_SIGNAL);
  }

  Serial.println("ATENÇÃO MOTORISTA, PREFERÊNCIA DO PEDESTRE");
  delay(DELAY_VALUE * 4);
  lowerHigher(GREEN_SIGNAL, YELLOW_SIGNAL);

  delay(DELAY_VALUE * 4);
  Serial.println("ATENÇÃO PEDESTRE, PODE PASSAR");
  lowerHigher(YELLOW_SIGNAL, RED_SIGNAL);
  lowerHigher(RED_SIGNAL_PERSON, GREEN_SIGNAL_PERSON);
  delay(DELAY_VALUE * 10);

  blink(SECONDS);

  Serial.println("PEDESTRE, SINAL FECHADO!");
  lowerHigher(GREEN_SIGNAL, RED_SIGNAL_PERSON);
  lower(RED_SIGNAL);
  Serial.println("MOTORISTA, PODE PROSSEGUIR");
}