//////////////
// WE TRIED //
//////////////

int timeDelay = 100;
int currentTime;
int lastState = LOW;
int lastMotion = LOW;
unsigned long time;
bool armMode; // safe = 0, armed = 1
bool isExecuted = false;
bool isAlarm = false;

// 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
  int buttonState = digitalRead(7);
  int motionState;
  if (lastState == LOW && buttonState == HIGH) {
    armMode = !armMode;
  }

  lastState = buttonState;

  // check mode
  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(timeDelay);
      digitalWrite(13, LOW);
        noTone(buzzer);
      delay(timeDelay);
    }

    motionState = digitalRead(2);
    // enable alarm
    if (lastMotion == LOW && motionState == HIGH) { isAlarm = true; }
    else if (lastMotion == HIGH && motionState == LOW) { noTone(buzzer); }
    if (isAlarm == true) {
      tone(buzzer, 1760);
        delay(500);
        tone(buzzer, 1397);
        delay(500);
    } else { noTone(buzzer); }
  }

  lastState = buttonState;
  lastMotion = motionState;
  delay(10);
}