const int FLAME_PIN = 2;
const int WATER_PIN = 5;

const int RELAY_PIN = 7;
const int BUZZER_PIN = 8;
const int LOW_WATER_LED = 9;

// Our simulated switches connect the input pins to GND
// when switched ON.

void setup() {
  pinMode(FLAME_PIN, INPUT_PULLUP);
  pinMode(WATER_PIN, INPUT_PULLUP);

  pinMode(RELAY_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LOW_WATER_LED, OUTPUT);

  // Relay inactive at startup
  digitalWrite(RELAY_PIN, LOW);
  digitalWrite(LOW_WATER_LED, LOW);

  Serial.begin(9600);
}

void loop() {
  bool flameDetected = (digitalRead(FLAME_PIN) == LOW);
  bool waterAvailable = (digitalRead(WATER_PIN) == LOW);

  // Pump operates only when flame is detected
  // AND water is available.
  bool pumpOn = flameDetected && waterAvailable;

  bool lowWater = !waterAvailable;

  // Wokwi relay module: LOW activates COM-to-NO
  digitalWrite(RELAY_PIN, pumpOn ? LOW : HIGH);

  digitalWrite(LOW_WATER_LED, lowWater ? HIGH : LOW);

  // Alert when flame is detected or water is low.
  if (flameDetected || lowWater) {
    tone(BUZZER_PIN, 2000);
  } else {
    noTone(BUZZER_PIN);
  }

  Serial.print("Flame: ");
  Serial.print(flameDetected ? "YES" : "NO");

  Serial.print(" | Water: ");
  Serial.print(waterAvailable ? "AVAILABLE" : "LOW");

  Serial.print(" | Pump: ");
  Serial.println(pumpOn ? "ON" : "OFF");

  delay(200);
}