int ledPin = 13, 
    countDown = 20,  //sec
    quick = 0, 
    interval = 0;
long startTime = 0, 
     nowTime = 0,
     preTime = 0, 
     timePass = 0;
bool state = 1;
int gameEnd = 0;

bool cutOrNot[3] = {0,0,0};

int whatWire[3] = {3,3,3};
//0:nothing,1:defuse,2:explode

void setup() {
  Serial.begin(9600);
  //Serial.println("begin");

  pinMode(ledPin, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  pinMode(3, INPUT_PULLUP);
  pinMode(4, INPUT_PULLUP);

  startTime = millis();
  preTime = startTime;
  interval = 1000 / countDown * 1.2;

  randomWire();
}

void loop() {
  switch (gameEnd){
    case 1:
      digitalWrite(8,0);
      digitalWrite(9,0);
      digitalWrite(10,0);
      digitalWrite(13,0);
      state = 0;
      Serial.println("Bomb Defused");
      gameEnd = 4;
      break;
    case 2:
      Serial.println("BOMB EXPLODED!!!");
      gameEnd = 4;
      break;
    case 4:
      break;
    default:
      countDownFuc();
      bottonCheck();
  
      digitalWrite(8,!cutOrNot[0]);
      digitalWrite(9,!cutOrNot[1]);
      digitalWrite(10,!cutOrNot[2]);
      break;
  }
}

void countDownFuc(){
  nowTime = millis();
  timePass = nowTime - startTime;
  //Serial.println(timePass);
  if((countDown * 1000) <= timePass){
    gameEnd = 2;
    return;
  } 

  if(quick <= 800) quick = timePass / 1000 * interval;
  else quick = 850;
  //Serial.println(quick);

  if((nowTime - preTime) >= (1000-quick) && timePass < (countDown * 1000)){
    state = !state;
    preTime = nowTime;
  }
  

  //Serial.println(state);
  digitalWrite(ledPin, state);
}

void bottonCheck(){
  if(gameEnd == 2) return;

  for(int i=0;i<=2;i++){
    if(cutOrNot[i] == 0 && digitalRead(i+2) == 0){
      cutOrNot[i] = !cutOrNot[i];
      gameEnd = whatWire[i];
    }
  }
}

void randomWire(){
  int num;
  randomSeed(analogRead(A0));

  for(int i=0;i<=2;i++){
    do{
      num = random(3);
      for(int j=0;j<i;j++)
        if(whatWire[j] == num){
          num = -1;
          break;
        }
    }
    while(num == -1);

    whatWire[i] = num;
    //Serial.println(whatWire[i]);
  }
}