#include <DHT.h>
#include <WiFi.h>
#include <ESP32Servo.h>
#include <PubSubClient.h>

#define DHTPIN 13  
#define DHTTYPE DHT22  
#define Gled 16
#define Rled 5
#define servoPin 4

int sv_active = 0;
Servo servo;
const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* mqtt_topic = "testdht"; 

#define DHTPIN 13
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);


WiFiClient wifiClient;
PubSubClient client(wifiClient);

void checkWiFi() {
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("WiFi disconnected. Reconnecting...");
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) {
      delay(500);
      Serial.print(".");
    }
    Serial.println("WiFi reconnected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
  }
}

void setup_wifi() {
  delay(10);
  Serial.begin(115200);
  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");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* message, unsigned int length) {
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
      client.publish(mqtt_topic, "ESP32 connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  servo.attach(servoPin, 500, 2400);
  pinMode(Gled, OUTPUT);
  pinMode(Rled, OUTPUT);
  digitalWrite(Gled, HIGH);
  digitalWrite(Rled, LOW);
  servo.write(0);
  dht.begin();
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  client.setKeepAlive(60); // Set keep alive interval to 60 seconds
}

void loop() {
  checkWiFi();

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

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

  // Check if any reads failed and exit early (to try again).
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  // Create payload string
  String payload = "T: " + String(temperature) + " °C, H: " + String(humidity) + " %";
  Serial.println(payload);

  if(temperature >70) {
    digitalWrite(Gled, LOW);
    digitalWrite(Rled, HIGH);
    servo.write(90);
    payload+="  Overheat!!";
  }
  else if (temperature<30)
  {
    digitalWrite(Gled, HIGH);
    digitalWrite(Rled, LOW);
    servo.write(0);
    payload+="  Working..";
  }

  

  // Publish the message to the MQTT broker
  if (client.publish(mqtt_topic, payload.c_str())) {
    Serial.println("Message published successfully");
  } else {
    Serial.println("Failed to publish message");
  }

  delay(200); 
}