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

const int LED_PIN = 2; // LED pin
const int PIR_PIN = 19; // PIR sensor pin
const char* ssid = "Wokwi-GUEST"; // WiFi SSID
const char* password = "";
const char* mqtt_server = "test.mosquitto.org"; // MQTT broker server
const char* mqtt_led_topic = "idontknow"; // MQTT topic for controlling LED
const char* mqtt_presence_topic = "presence/cuisine"; // MQTT topic for PIR sensor

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  Serial.println("Connecting to WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

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

  // Convert payload to string
  String message = "";
  for (int i = 0; i < length; i++) {
    message += (char)payload[i];
  }

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

  // Control LED based on received message
  if (strcmp(topic, mqtt_led_topic) == 0) {
    if (message == "1") {
      digitalWrite(LED_PIN, HIGH); // Turn LED on
      Serial.println("LED turned on");
    } else if (message == "0") {
      digitalWrite(LED_PIN, LOW); // Turn LED off
      Serial.println("LED turned off");
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.println("Attempting MQTT connection...");
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected to MQTT broker");
      // Once connected, subscribe to the LED topic
      client.subscribe(mqtt_led_topic);
    } else {
      Serial.print("Failed to connect to MQTT broker, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT); // Set LED pin as output
  pinMode(PIR_PIN, INPUT); // Set PIR sensor pin as input
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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

  // Read PIR sensor
  //int presence = digitalRead(PIR_PIN);
int  presence =  1;
  // Publish PIR sensor data to presence topic
  client.publish(mqtt_presence_topic, String(presence).c_str());

  delay(1000); // Adjust delay as needed
}