int ledPins[] = {22, 17, 16, 4};
int btnPins[] = {2, 21, 19, 18};
int buzzer = 15;

// Button values
volatile int btn_val1, btn_val2, btn_val3, btn_val4;
int size = 0;
int point = 0;
int delayTime = 500;
const int maxSize = 11;
int randomArray[maxSize];

void setup() {
  // Initializing the leds and buzzer as output and button as input
  for (int index = 0; index < 4; ++index) {
    pinMode(ledPins[index], OUTPUT);
    pinMode(btnPins[index], INPUT);
  }
  pinMode(buzzer, OUTPUT);

  // Multiprocessing for reading the inputs
  xTaskCreate(BTN1_READ, "Btn1 Value", 1000, NULL, 1, NULL);
  xTaskCreate(BTN2_READ, "Btn2 Value", 1000, NULL, 1, NULL);
  xTaskCreate(BTN3_READ, "Btn3 Value", 1000, NULL, 2, NULL);
  xTaskCreate(BTN4_READ, "Btn4 Value", 1000, NULL, 2, NULL);

  Serial.begin(115200);
}

void loop() {
  generate_RandNumbers();
  Serial.print("ERROR!!!!");
}

void BTN1_READ(void* param) {
  while (1) {
    btn_val1 = digitalRead(btnPins[0]);
    vTaskDelay(10);
  }
}

void BTN2_READ(void* param) {
  while (1) {
    btn_val2 = digitalRead(btnPins[1]);
    vTaskDelay(10);
  }
}

void BTN3_READ(void* param) {
  while (1) {
    btn_val3 = digitalRead(btnPins[2]);
    vTaskDelay(10);
  }
}

void BTN4_READ(void* param) {
  while (1) {
    btn_val4 = digitalRead(btnPins[3]);
    vTaskDelay(10);
  }
}
void generate_RandNumbers() {

  if (size > 10) size = 0;

  int randomNumber = random(4);

  randomArray[size] = randomNumber;

  Serial.print("New Random Number: ");
  Serial.print(randomNumber);
  Serial.print("    || Sequence of LED: ");

  for (int i = 0; i <= size; i++) {
    Serial.print(randomArray[i] + 1);
    Serial.print(" ");
  }
  Serial.print("|| Size: ");
  Serial.print(size);
  Serial.print("|| DelayTime ");
  Serial.println(delayTime);
  delay(100);
  applyChallenge();
}

void applyChallenge() {
  for (int i = 0; i <= size; i++) {

    int challengeData = randomArray[i];

    digitalWrite(ledPins[challengeData], HIGH);
    tone(buzzer, 1000);
    delay(100);
    noTone(buzzer);
    delay(delayTime);
    digitalWrite(ledPins[challengeData], LOW);
    delay(delayTime);
  }
  delayTime -= 10;
  btnOutput();
}
void btnOutput() {
  if (btn_val1 == 1) checkedPressed(0);
  if (btn_val2 == 1) checkedPressed(1);
  if (btn_val3 == 1) checkedPressed(2);
  if (btn_val4 == 1) checkedPressed(3);
  if (btn_val1 == 0 && btn_val2 == 0 && btn_val3 == 0 && btn_val4 == 0) btnOutput();
}

void checkedPressed(int pin) {
  // Output of the btn that has been clicked
  if (point <= size) {
    if (randomArray[point] == pin) {

      //checking if the data is correct
      Serial.print("LED :");
      Serial.print(pin + 1);
      Serial.print(" is equal to ");
      Serial.println(randomArray[point]);
      Serial.print("Size = ");
      Serial.print(size);
      Serial.print("   Point = ");
      Serial.print(point);
      Serial.print("   Button Clicked: ");
      Serial.print(pin + 1);
      Serial.print("   LED LIGHT ON: ");
      Serial.println(pin + 1);

      digitalWrite(ledPins[pin], HIGH);
      tone(buzzer, 1000);
      delay(50);
      digitalWrite(ledPins[pin], LOW);
      noTone(buzzer);
      delay(50);
      point++;

      delay(500);

      if (point > size) {
        size++;
        point = 0;
        generate_RandNumbers();
      } else {
        btnOutput();
      }
    } else gameOver();
  } else {
    point = 0;
  }
}
void gameOver() {
  for (int i = 0; i < 15; i++) {
    int rand = random(4);

    digitalWrite(ledPins[rand], HIGH);
    tone(buzzer, 500);
    delay(50);
    digitalWrite(ledPins[rand], LOW);
    noTone(buzzer);
    delay(50);
  }

  size = 0;
  generate_RandNumbers();
}