#define RGB_R 5
#define RGB_G 15
#define RGB_B 2
#define KEY_PIN 23
#define LIGHT_PIN 4
#define PIR_PIN 27
#define BEEP_PIN 25

bool defensing = false;
bool alarming = false;

void IRAM_ATTR onKeyPress() {
  alarming = false;
  defensing = false;
  allLedOff();
  noTone(BEEP_PIN);
}

void IRAM_ATTR onPirTrigger() {
  if (defensing) alarming = true;
}

void allLedOff() {
  digitalWrite(RGB_R, LOW);
  digitalWrite(RGB_G, LOW);
  digitalWrite(RGB_B, LOW);
}

void greenBreath() {
  static int b = 0, d = 2;
  analogWrite(RGB_G, b);
  b += d;
  if (b <= 0 || b >= 255) d = -d;
  delay(10);
}

void setup() {
  Serial.begin(115200);
  pinMode(RGB_R, OUTPUT);
  pinMode(RGB_G, OUTPUT);
  pinMode(RGB_B, OUTPUT);
  pinMode(BEEP_PIN, OUTPUT);
  allLedOff();

  pinMode(KEY_PIN, INPUT_PULLDOWN);
  attachInterrupt(digitalPinToInterrupt(KEY_PIN), onKeyPress, RISING);

  pinMode(PIR_PIN, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(PIR_PIN), onPirTrigger, FALLING);
}

void loop() {
  int lightVal = analogRead(LIGHT_PIN);
  
  if (lightVal > 2000 && !alarming) {
    defensing = true;
    greenBreath();
  } else {
    defensing = false;
    allLedOff();
  }

  if (alarming) {
    digitalWrite(RGB_R, HIGH);
    digitalWrite(RGB_B, LOW);
    tone(BEEP_PIN, 1000);
    delay(200);
    digitalWrite(RGB_R, LOW);
    digitalWrite(RGB_B, HIGH);
    noTone(BEEP_PIN);
    delay(200);
  }
}