#define LED1 0
#define LED2 1
#define LED3 2
#define SW   3
#define BUZZ 4

uint8_t ledNo[] = {LED3, LED2, LED1};
uint8_t mode;
bool ledon, isClick;

void setup()
{
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(BUZZ, OUTPUT);
  pinMode(SW, INPUT_PULLUP);

  mode = 0;
  ledon = false;
  isClick = false;
}

void loop()
{
  if(swon())
    mode = 1;

  switch(mode)
  {
    case 0:
      delay(300);
      break;
    case 1:
      for(uint8_t j=0; j<4; j++)
      {
        for(uint8_t i=0; i<60; i++)
        {
          if(j == 3)
          {
            digitalWrite(LED1, ledon);
            digitalWrite(LED2, ledon);
            digitalWrite(LED3, ledon);
          }
          else
            digitalWrite(ledNo[j], ledon);
          ledon = !ledon;
          delay(500);
          if(swon())
            goto INTERRUPT;
          delay(500);
        }
      }
      mode = 2;
      break;
    INTERRUPT:
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      ledon = false;
      mode = 0;
      break;
    case 2:
      while(true)
      {
        beep();
        if(swon())
          break;
        delay(200);
      }
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      ledon = false;
      mode = 0;
      break;
  }
}

void beep()
{
  tone(BUZZ, 1200);
  delay(200);
  noTone(BUZZ);
}

bool swon()
{
  if(digitalRead(SW) == LOW)
  {
    if(isClick) //スイッチは押しっぱなし
      return false;
    else //スイッチは一度離した
    {
      beep();
      isClick = true;
      return true;
    }
  }
  else
  {
    if(isClick) //スイッチを離した
      isClick = false;
    return false;
  }
}