const int LEDs[] = { 7 , 6 , 5 , 4 , 3 , 2, 8 };
const int ledStripSize = sizeof(LEDs) / sizeof(LEDs[0]);

const int startingPosition = 0;

//intialising the current position
int currentPosition;


typedef void (*callbackFunction)();  


void setup() {
  Serial.begin(115200);
  // set all of the led pin modes to HIGH
  for(int i = 0 ; i < ledStripSize ; i++){
    pinMode(LEDs[i] , OUTPUT);
  }
  //check if the starting postion is out of bounds
  if(startingPosition <= ledStripSize - 1){
      currentPosition = startingPosition;
  }
  else{
    Serial.println("Starting Position is out of bounds , Setting The Default Current Postion to 0");
    currentPosition = 0;
  }

  //turning the light on starting position 
  blinkLED();
}

void loop() {
  // moveRight();
  // moveLeft();
  // moveRight();
   repeat(moveRight , 6);
   repeat(moveLeft , 6);

}


bool moveRight(){
  //handling out of range errors
  if(currentPosition < ledStripSize - 1 ){
      currentPosition++;
      blinkLED();
      return true;
  }
  else{
       Serial.println("Right is out of bounds");
       blinkLED();
      return false;
  };
}

bool moveLeft(){
    if(currentPosition > 0 ){
      currentPosition--;
      blinkLED();
      return true;
  }
  else{
     Serial.println("Left is out of bounds");
       blinkLED();
      return false;
  };

}

void blinkLED(){

 digitalWrite(LEDs[currentPosition] , HIGH);
 Serial.println(currentPosition);
 delay(500);
 digitalWrite(LEDs[currentPosition] , LOW);
 delay(500);

}

void repeat(callbackFunction callback , int times){
  for (int i = 0 ; i < times ; i++){
    callback();
  }
}