// ボタンとリレーピンの設定
const int relayPin = 2;
const int stopButtonPin = 3;
const int centigrade_minus_5_to_10_Pin = 4;
const int centigrade_minus_10_to_15_Pin = 5;
const int centigrade_minus_15_or_less_Pin = 6;
const int LED_Pin = 10;

// ON/OFFの間隔（ミリ秒）
const unsigned long on_minus_5_to_10 = 1000;
const unsigned long off_minus_5_to_10 = 1000;
const unsigned long on_minus_10_to_15 = 2000;
const unsigned long off_minus_10_to_15 = 2000;
const unsigned long on_minus_15_or_less = 12000;
const unsigned long off_minus_15_or_less = 48000;

unsigned long onTime = 0;
unsigned long offTime = 0;
unsigned long onT = 0;
unsigned long offT = 0;
unsigned long previousMillis = 0;

bool flg = false;
bool heatingActive = false;
bool relayState = false;
bool newSettingAvailable = false;
bool stopButtonPressed = false;         // 停止ボタンの状態

void setup() {
  pinMode(relayPin, OUTPUT);
  pinMode(stopButtonPin, INPUT_PULLUP);
  pinMode(centigrade_minus_5_to_10_Pin, INPUT_PULLUP);
  pinMode(centigrade_minus_10_to_15_Pin, INPUT_PULLUP);
  pinMode(centigrade_minus_15_or_less_Pin, INPUT_PULLUP);
  pinMode(LED_Pin, OUTPUT);
  
  digitalWrite(centigrade_minus_5_to_10_Pin, LOW);
  digitalWrite(centigrade_minus_10_to_15_Pin, LOW);
  digitalWrite(centigrade_minus_15_or_less_Pin, LOW);
  digitalWrite(relayPin, LOW);
  digitalWrite(LED_Pin, LOW);
}

void loop() {
  // ボタンの状態を読み取る
  bool current_StopButton_State = digitalRead(stopButtonPin);
  bool current_minus_5_to_10_ButtonState = digitalRead(centigrade_minus_5_to_10_Pin);
  bool current_minus_10_to_15_ButtonState = digitalRead(centigrade_minus_10_to_15_Pin);
  bool current_minus_15_or_less_ButtonState = digitalRead(centigrade_minus_15_or_less_Pin);
  // ストップボタンが押された場合の処理
  if (current_StopButton_State == HIGH && !stopButtonPressed) {
    stopButtonPressed = true;           // 停止ボタンフラグをtrue
    // 加熱を停止し、変数を初期化
    heatingActive = false;
    relayState = false;
    digitalWrite(relayPin, LOW); // リレーOFF
    digitalWrite(LED_Pin, LOW);   // LEDもOFF
    onTime = 0;
    offTime = 0;
  } else if (current_StopButton_State == LOW) {
    stopButtonPressed = false;          // 停止ボタンフラグをfalse
  }

  // 温度設定のチェック
  if (newSettingAvailable == false) {
    if (current_minus_5_to_10_ButtonState == HIGH) {
      onTime = on_minus_5_to_10;
      offTime = off_minus_5_to_10;
      newSettingAvailable = true;
    }
    if (current_minus_10_to_15_ButtonState == HIGH) {
      onTime = on_minus_10_to_15;
      offTime = off_minus_10_to_15;
      newSettingAvailable = true;
        digitalWrite(LED_Pin, HIGH);   // LEDもOFF
    }
    if (current_minus_15_or_less_ButtonState == HIGH) {
      onTime = on_minus_15_or_less;
      offTime = off_minus_15_or_less;
      newSettingAvailable = true;
    }
  }
  //リレー停止中のみ通過
  if (newSettingAvailable && !heatingActive) {
    // heatingActiveがfalseのときは、最初に加熱を開始
    heatingActive = true; // 加熱を開始
    relayState = true;   // 
    previousMillis = millis(); // タイマーリセット
    onT = onTime;
    offT = offTime;
    flg = false;
    newSettingAvailable = false;
  }
  // リレーの制御
  if (heatingActive) {
    unsigned long currentMillis = millis();
    if (relayState) {
      // リレーをOFFにする時間が経過したか？
      if (flg){
        onT = onTime;
        offT = offTime;
      }
      if (currentMillis - previousMillis >= offT) {
        // リレーをONにする時間が経過したか？
        digitalWrite(relayPin, HIGH); // リレーON
        //digitalWrite(LED_Pin, HIGH);   // LEDもON
        relayState = false;
        previousMillis = millis(); // タイマーリセット
        flg = false;
      }
    } else {
      if (currentMillis - previousMillis >= onT) {
        digitalWrite(relayPin, LOW); // リレーOFF
        //digitalWrite(LED_Pin, LOW);   // LEDもOFF
        relayState = true;
        previousMillis = millis(); // タイマーリセット
        flg = true;
        digitalWrite(LED_Pin, LOW);   // LEDもOFF
      }
    }
  }
}