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

// Replace with your Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Replace with your MQTT broker's address
const char* mqtt_server = "broker.hivemq.com";  // Public broker for testing

WiFiClient espClient;
PubSubClient client(espClient);

// DHT22 setup
#define DHTPIN 5         // Pin for DHT22 sensor
#define DHTTYPE DHT22    // Define sensor type
DHT dht(DHTPIN, DHTTYPE);

// Sensor pins
#define LDR_PIN 34       // Photoresistor (LDR)
#define PIR_PIN 32       // Motion sensor (PIR)
#define GAS_PIN 33       // Gas sensor (MQ-2 or similar)

// Function to connect to Wi-Fi
void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

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

  Serial.println("");
  Serial.println("WiFi connected");
}

// Function to connect to MQTT broker
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    
    if (client.connect("ArduinoClient")) {
      Serial.println("connected");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

// Publish sensor data to MQTT
void sendSensorData() {
  int lightLevel = analogRead(LDR_PIN);   // Read LDR sensor value
  int motion = digitalRead(PIR_PIN);      // Read PIR sensor value
  int gasLevel = analogRead(GAS_PIN);     // Read gas sensor value

  // Read temperature and humidity from DHT22
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if any reads failed
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // Convert sensor values to string and publish to MQTT topics
  client.publish("home/sensors/light", String(lightLevel).c_str());
  client.publish("home/sensors/motion", String(motion).c_str());
  client.publish("home/sensors/gas", String(gasLevel).c_str());
  client.publish("home/sensors/temperature", String(temperature).c_str());
  client.publish("home/sensors/humidity", String(humidity).c_str());

  // Print sensor data to Serial Monitor
  Serial.println("Sensor data sent to MQTT:");
  Serial.print("Light: "); Serial.println(lightLevel);
  Serial.print("Motion: "); Serial.println(motion);
  Serial.print("Gas: "); Serial.println(gasLevel);
  Serial.print("Temperature: "); Serial.println(temperature);
  Serial.print("Humidity: "); Serial.println(humidity);
}

void setup() {
  Serial.begin(115200);
  
  // Initialize DHT sensor
  dht.begin();

  // Initialize other sensor pins
  pinMode(LDR_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(GAS_PIN, INPUT);
  
  // Connect to Wi-Fi
  setup_wifi();

  // Set up MQTT broker
  client.setServer(mqtt_server, 1883);
}

void loop() {
  // Reconnect to MQTT broker if disconnected
  if (!client.connected()) {
    reconnect();
  }

  client.loop();
  
  // Send sensor data every 2 seconds
  sendSensorData();
  delay(2000);
}