#include <WiFi.h>
#include <PubSubClient.h>

#define PIR_PIN 14
#define LED_PIN 12
#define BUZZER_PIN 13

// WiFi (Wokwi)
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT Broker
const char* mqtt_server = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);

// ---------------- CALLBACK --------------------
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);

  String msg = "";
  for (int i = 0; i < length; i++) {
    msg += (char)message[i];
  }

  Serial.print("Message: ");
  Serial.println(msg);

  // If phone sends "BUZZER_ON"
  if (String(topic) == "home/security/control") {

    if (msg == "BUZZER_ON") {
      digitalWrite(BUZZER_PIN, HIGH);
    }

    if (msg == "BUZZER_OFF") {
      digitalWrite(BUZZER_PIN, LOW);
    }
  }
}
// ----------------------------------------------

void setup_wifi() {
  Serial.print("Connecting to WiFi...");
  WiFi.begin(ssid, password, 6);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println(" connected!");
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");

    if (client.connect("ESP32Security")) {
      Serial.println("connected!");
      client.subscribe("home/security/control");  // <-- Subscribe for commands
    } else {
      Serial.print("failed, rc=");
      Serial.println(client.state());
      delay(1500);
    }
  }
}

void setup() {
  Serial.begin(115200);

  pinMode(PIR_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  setup_wifi();

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);   // <-- Enable callback
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  int motion = digitalRead(PIR_PIN);

  if (motion == HIGH) {
    Serial.println("Motion Detected — sending alert!");
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);

   client.publish("home/security/motion", "Motion Detected!",true);
   //  client.publish("home/security/motion", "1", true);

    delay(1200);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(100);
}