#define buttonPin 2
#define ledPin 3
bool prevState = false;
bool ledState = false;
int arrToCheck[8];
int arrChecker[] = {1,1,1,1,1,1,1,1};
const int levels = 10;
int counter = 0;
bool countChecker = true;


void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

int len(int arr[]) {
  return (sizeof(arr) / sizeof(arr[0]));
}

void arrAdd(int arr[], int toAdd) {
  for (int i = 0; i < len(arr); i++) {
    arr[i] = arr[i+1];
  }
  arr[len(arr)] = toAdd;
}

bool arrEquals(int arr[], int arr2[]) {
  for (int i = 0; i < len(arr); i++){
    if (arr[i] != arr2[i]) {
      return false;
    }
  }
  return true;
}

int levelOfBrightness(int levelsPull, int currentLevel) {
  if (currentLevel == 0 ) {
    return 0;
  } else {
    return  (255.0 / (levelsPull -1)) * currentLevel;
  }
}

void loop() {
  bool buttonState = digitalRead(buttonPin);
  if (buttonState != prevState) {
    prevState = buttonState;
     while (prevState == buttonState) {
      arrAdd(arrToCheck, !digitalRead(buttonPin));
    if (arrEquals(arrToCheck, arrChecker)) {
      if (countChecker) {
        counter ++;
        if (counter == levels - 1) {
          countChecker = !countChecker;
        }
      } else {
        counter --;
        if (counter == 0) {
          countChecker = !countChecker;
        }
      }
    }
    break;
    }
  }
  analogWrite(ledPin, levelOfBrightness(levels, counter));
}