const int buttonPin = 2;    // the pin that the pushbutton is attached to
// the pin that the LED is attached to
const int led1Pin = 00;
const int led2Pin = 00;
const int led3Pin = 00;
const int led4Pin = 00;

// keep track if the led is high or low
int led1State = LOW;
int led2State = LOW;
int led3State = LOW;
int led4State = LOW;

// Variables will change:
int buttonPushCounter = 0;   // counter for the number of button presses
int buttonState = 0;         // current state of the button
int lastButtonState = 0;     // previous state of the button

int numToGuess = 1;         // number to guess

void setup() {
  // initialize the button pin as a input:
  pinMode(buttonPin, INPUT);
  // initialize the LED as an output:
  pinMode(led1Pin, OUTPUT);
  pinMode(led2Pin, OUTPUT);
  pinMode(led3Pin, OUTPUT);
  pinMode(led4Pin, OUTPUT);
  // initialize serial communication:
  Serial.begin(9600);

  decToBin();
}

void decToBin() {
  // Set every led to LOW
  digitalWrite(led1Pin, LOW);
  digitalWrite(led2Pin, LOW);
  digitalWrite(led3Pin, LOW);
  digitalWrite(led4Pin, LOW);

  // Make a copy of the number to guess.
  int copy = numToGuess;
  Serial.print("Number to guess: ");
  Serial.println(copy);

  if ((copy - 8) > -1) {
    copy = copy - 8;
    led1State = HIGH;
    digitalWrite(led1Pin, led1State);
  }
  if ((copy - 4) > -1) {
    copy = copy - 4;
    led2State = HIGH;
    digitalWrite(led2Pin, led2State);
  }
  if ((copy - 2) > -1) {
    copy = copy - 2;
    led3State = HIGH;
    digitalWrite(led3Pin, led3State);
  }
  if ((copy - 1) > -1) {
    copy = copy - 1;
    led4State = HIGH;
    digitalWrite(led4Pin, led4State);
  }
}

void loop() {
  // read the pushbutton input pin:
  buttonState = digitalRead(buttonPin);

  // compare the buttonState to its previous state
  if (buttonState != lastButtonState) {
    // if the state has changed, increment the counter
    if (buttonState == HIGH) {
      // if the current state is HIGH then the button
      // wend from off to on:
      buttonPushCounter++;
      Serial.println("on");
      Serial.print("number of button pushes:  ");
      Serial.println(buttonPushCounter);

      checkIfNumIsGuessed();
    } else {
      // if the current state is LOW then the button
      // wend from on to off:
      Serial.println("off");
    }
    // Delay a little bit to avoid bouncing
    delay(50);
  }
  // save the current state as the last state,
  //for next time through the loop
  lastButtonState = buttonState;
}

void checkIfNumIsGuessed() {
  if (buttonPushCounter == numToGuess) {
    Serial.println("You guessed the number right! Next number...");
    buttonPushCounter = 0;
    numToGuess++;
    if (numToGuess > 15) {
      numToGuess = 1;
    }
    decToBin();
  }
}