const int ledPins[4] = {};
const int buttonPins[4] = {};

int sequence[100];
int userInput[100];
int level = 0;
bool gameOver = false;

void setup() {
  //leds OUTPUT
  //botoões INPUTPULL_UP
  randomSeed(analogRead(A0));
  Serial.begin(9600);
  nextLevel();
}

void loop() {
  if (!gameOver) {
    showSequence();
    getUserInput();
  }
}

void nextLevel() {
  sequence[level] = random(0, 4);
  level++;
  delay(1000);
}

void showSequence() {
  for (int i = 0; i < level; i++) {
    int color = sequence[i];
    digitalWrite(ledPins[color], HIGH);
    delay(500);
    digitalWrite(ledPins[color], LOW);
    delay(250);
  }
}

void getUserInput() {
  for (int i = 0; i < level; i++) {
    int input = waitForButtonPress();
    userInput[i] = input;
    digitalWrite(ledPins[input], HIGH);
    delay(300);
    digitalWrite(ledPins[input], LOW);
    delay(100);

    if (userInput[i] != sequence[i]) {
      gameOver = true;
      Serial.println("Game Over!");
      flashAll(3);
      level = 0;
      delay(1000);
      nextLevel(); // recomeça
      gameOver = false;
      return;
    }
  }
  delay(500);
  nextLevel();
}

int waitForButtonPress() {
  while (true) {
    for (int i = 0; i < 4; i++) {
      if (digitalRead(buttonPins[i]) == LOW) {
        while (digitalRead(buttonPins[i]) == LOW); // espera soltar
        return i;
      }
    }
  }
}

void flashAll(int times) {
  for (int t = 0; t < times; t++) {
    for (int i = 0; i < 4; i++) {
      digitalWrite(ledPins[i], HIGH);
    }
    delay(300);
    for (int i = 0; i < 4; i++) {
      digitalWrite(ledPins[i], LOW);
    }
    delay(300);
  }
}