/////////////////////////////////////////////
// NOTE: BLINKING RED MEANS IN ARMING MODE //
/////////////////////////////////////////////

int armTimeDelay = 100;  // arming sound delay
int alarmTimeDelay = 500; // alarm sound delay
int buttonState = 0;  // declare state of button
int currentTime;  // declare current tick for arming sound effect
int lastState = LOW;    // toggle state
unsigned long time; // declare time var (tick)
bool armMode; // safe = 0, armed = 1
bool isExecuted = false;  // init current time once for the time diff
bool isAlarm = false; // alarm switch

// component vars
int buzzer = 6;

void setup()
{
  pinMode(13, OUTPUT);  // red led
  pinMode(12, OUTPUT);  // green led
  pinMode(7, INPUT_PULLUP); // button
  pinMode(buzzer, OUTPUT);  // if the buzzer has 3 legs, connect signal to 6 instead
  pinMode(2, INPUT);  // motion sensor
  Serial.begin(9600);
}

void loop()
{
  time = millis();

  // switch modes from safe to armed [cannot be repeated for now, idk how to fix it]
  buttonState = digitalRead(7);
  if (lastState == LOW && buttonState == HIGH) {
    Serial.println(armMode);
      armMode = !armMode;
  }
  lastState = buttonState;

  // check mode and reset all state
  if (armMode == false) {
    digitalWrite(13, LOW);
    digitalWrite(12, HIGH);
    noTone(buzzer);
    isExecuted = false;
    isAlarm = false;
  } else {
    digitalWrite(12, LOW);

    // arming beep and light loop
    if (isExecuted == false) {
      isExecuted = true;
      currentTime = time;
    }

  // limit loop to 2 seconds
    int timeDiff = time - currentTime;
    if (timeDiff >= 2000 && timeDiff <= 2100) {
        digitalWrite(13, LOW);

    } else if (timeDiff < 2000) {
      digitalWrite(13, HIGH);
      tone(buzzer, 220);
      delay(armTimeDelay);
      digitalWrite(13, LOW);
      noTone(buzzer);
      delay(armTimeDelay);
    }

    // enable alarm
    if (digitalRead(2) == HIGH) { isAlarm = true; }
    else { noTone(buzzer); }
    if (isAlarm == true) {
      tone(buzzer, 1760);
        delay(alarmTimeDelay);
        tone(buzzer, 1397);
        delay(alarmTimeDelay);
    } else { noTone(buzzer); }
  }

  delay(10);
}