int wayDelay = 1000; //Delay between the toggle of two LEDs on the way to and from each player
int endDelay = wayDelay + wayDelay / 2; //Delay for the last LED as to make the game a little bit more fair
const byte btn1 = 3; //Pin for Button 1
const byte btn2 = 2; //Pin for Button 2
int counter = 0; //Counter Variable for "Statemachine"
bool randomValue; //Variable to hold seeded random value
bool currentTarget; //Current player that the LED is "targeting"
bool interrupt; //Variable to help with input interrupts
int test; //Debug
int pointsP1 = 0; //Points of P1
int pointsP2 = 0; //Points of P2
int a = 500; //Delay for Sound
int b = 200; //Delay for Sound
void setup() {
  //Start Serial
  Serial.begin(9600);

  //Register all needed Pins
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(btn1, INPUT_PULLUP);
  pinMode(btn2, INPUT_PULLUP);

  //Register Interrupts for both Buttons
  attachInterrupt(digitalPinToInterrupt(btn1), buttonOne, FALLING);
  attachInterrupt(digitalPinToInterrupt(btn2), buttonTwo, FALLING);

  //Entry Text
  Serial.println("-----Welcome to the Fab-LED-Game-----");
  Serial.println("Press any Button to start the game!");
}

void loop() {
  // Main loop
  switch (counter) {
    case 0: //StartGame
      digitalWrite(10, HIGH);
      if (!digitalRead(btn1) || !digitalRead(btn2)) {
        randomSeed(millis());
        startGame();
      }
      break;
    case 1: //Move from mid to randomly chosen player
      moveFromMid(currentTarget);
      break;
    case 2: //Wait For Interrupt, If no interrupt grant Points
      delay(endDelay);
      if (interrupt) {
        interrupt = false;
        counter = 3;
      } else {
        gamePoint(!currentTarget);
      }
      break;
    case 3: //Change LED direction when button press was successfull
      moveBetweenPlayers(currentTarget);
      break;
    case 4:
      makeSound(); //Play sound
      break;
  }

}

void startGame() {
  //Manage beginning Delay
  wayDelay = 1000; //set delay between leds on the way to the player
  endDelay = wayDelay + wayDelay / 2; //set delay of the LED at each of the ends
  //Start in Middle, Choose Random Player, Go into that Direction
  currentTarget = random(2); //Set receiving player (pseudo)randomly
  counter = 1;
}

//Function to shorten the delay to make the game faster and faster
void shortenDelay() {
  wayDelay -= 100;
  endDelay = wayDelay + wayDelay / 2;
}

void moveFromMid(bool target) {
  if (target) {
    //Move to player 1
    for (int i = 10; i < 13; i++) {
      delay(wayDelay);
      digitalWrite(i, LOW);
      //delay(wayDelay);
      digitalWrite(i + 1, HIGH);
    }
  } else {
    //Move to player 2
    for (int j = 10; j > 7; j--) {
      delay(wayDelay);
      digitalWrite(j, LOW);
      // delay(wayDelay);
      digitalWrite(j - 1, HIGH);
    }
  }
  counter = 2;
}

void moveBetweenPlayers(bool sender) {
  currentTarget = !sender;
  shortenDelay();
  if (sender) {
    for (int i = 13; i > 10; i--) {
      delay(wayDelay);
      digitalWrite(i, LOW);
      //delay(wayDelay);
      digitalWrite(i - 1, HIGH);
    }
  } else {
    for (int j = 7; j < 10; j++) {
      delay(wayDelay);
      digitalWrite(j, LOW);
      //delay(wayDelay);
      digitalWrite(j + 1, HIGH);
    }
  }
  moveFromMid(currentTarget);
}

void gamePoint(bool player) { //Manage game point and reset of game
  if (player) {
    pointsP1++;
  } else {
    pointsP2++;
  }
  Serial.println("---Current Points---");
  Serial.print("Player 1: ");
  Serial.print(pointsP1);
  Serial.print(" - Player2: ");
  Serial.println(pointsP2);
  resetLEDs();
  counter = 4;
}

void makeSound() {
  tone(4, 262, a);
  delay(b);
  tone(4, 294, a);
  delay(b);
  tone(4, 330, a);
  delay(b);
  tone(4, 349, a);
  delay(b);
  tone(4, 392, a);
  delay(b);
  tone(4, 392, a);
  delay(b * 3);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 392, a);
  delay(b * 3);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 440, a);
  delay(b);
  tone(4, 392, a);
  delay(b * 3);
  tone(4, 349, a);
  delay(b);
  tone(4, 349, a);
  delay(b);
  tone(4, 349, a);
  delay(b);
  tone(4, 349, a);
  delay(b);
  tone(4, 330, a);
  delay(b);
  tone(4, 330, a);
  delay(b * 3);
  tone(4, 294, a);
  delay(b);
  tone(4, 294, a);
  delay(b);
  tone(4, 294, a);
  delay(b);
  tone(4, 294, a);
  delay(b);
  tone(4, 262, a);
  delay(1000);
  counter = 0;
}

void buttonOne() {
  //Manage Button Press Player 1
  if (counter != 0) {
    if (digitalRead(13)) {
      interrupt = 1;
    } else {
      gamePoint(false);
    }
  }
  return;
}

void buttonTwo() {
  //Manage Button Press Player 2
  if (counter != 0) {
    if (digitalRead(7)) {
      interrupt = 1;
    } else {
      gamePoint(true);
    }
  }

  return;
}

//Reset all LEDs
void resetLEDs() {
  for (int j = 7; j < 14; j++) {
    digitalWrite(j, LOW);
  }
}