#define TIMER 10 // タイマー時間（秒）
#define HALF_TIMER 5
#define SOON_TIMER 3

#define SW_PIN A5 // スイッチ接続端子
#define SW_OFF 1  // スイッチOFFのdigitalReadの値

#define LED_PIN 12 // LED接続端子
#define LED_ON_INTERVAL   50 // LEDを点灯する時間
#define LED_OFF_INTERVAL 950 // LEDを消灯する時間

#define FULL_LED 8
#define HALF_LED 6
#define SOON_LED 4

#define SPEAKER_PIN A0  // スピーカー接続端子
#define ALARM_TONE 1760 // アラーム音の周波数
#define ALARM_COUNT 3   // アラームを鳴らす回数

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  pinMode(FULL_LED, OUTPUT);
  pinMode(HALF_LED, OUTPUT);
  pinMode(SOON_LED, OUTPUT);
  pinMode(SW_PIN, INPUT_PULLUP);
}

void loop() {
  while (digitalRead(SW_PIN) == SW_OFF) {
  }
  digitalWrite(FULL_LED, HIGH);
  for (int i = 0; i < TIMER; i++) {
    int nokori = TIMER - i;
    if (nokori == HALF_TIMER ) {
      digitalWrite(FULL_LED, LOW);
      digitalWrite(HALF_LED, HIGH);
    }
    if (nokori == SOON_TIMER) {
      digitalWrite(HALF_LED, LOW);
      digitalWrite(SOON_TIMER, HIGH);
    }

    if (nokori <= SOON_TIMER) {
      tone(A0, 1760);
      digitalWrite(LED_PIN, HIGH);
      delay(LED_ON_INTERVAL);
      noTone(A0);
      digitalWrite(LED_PIN, LOW);
      delay(LED_OFF_INTERVAL);
    } else {
      digitalWrite(LED_PIN, HIGH);
      delay(LED_ON_INTERVAL);
      digitalWrite(LED_PIN, LOW);
      delay(LED_OFF_INTERVAL);
    }
  }
  digitalWrite(LED_PIN, HIGH);
  for (int i = 0; i < ALARM_COUNT; i++) {
    tone(SPEAKER_PIN, ALARM_TONE);
    delay(60);
    noTone(SPEAKER_PIN);
    delay(60);

    tone(SPEAKER_PIN, ALARM_TONE);
    delay(60);
    noTone(SPEAKER_PIN);
    delay(60);

    tone(SPEAKER_PIN, ALARM_TONE);
    delay(120);
    noTone(SPEAKER_PIN);
    delay(1000);
  }
  digitalWrite(LED_PIN, LOW);
}