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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
const int mqttPort = 1883;

#define DHTPIN 2        // Pin data DHT22 
#define DHTTYPE DHT22   // Type sensor DHT (DHT22)

const int photoresistorPin = 34; // Pin analog for photoresistor

WiFiClient espClient;
PubSubClient client(espClient);
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Connect to MQTT broker
  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    if (client.connect("ESP32Client")) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      delay(5000);
    }
  }
}

void loop() {
  // read data from sensor DHT22
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // read data from sensor photoresistor
  int lightIntensity = analogRead(photoresistorPin);

  // Pastikan pembacaan suhu dan kelembaban valid
  if (!isnan(humidity) && !isnan(temperature)) {
    Serial.print("Humidity: ");
    Serial.print(humidity);
    Serial.print("%, Temperature: ");
    Serial.print(temperature);
    Serial.println("°C");

    // sending data suhu to topic MQTT
    String mqttTopicTemp = "temperature_data";
    String payloadTemp = String(temperature);
    client.publish(mqttTopicTemp.c_str(), payloadTemp.c_str());
  }

  //  validity light intensity valid
  if (lightIntensity >= 0 && lightIntensity <= 4095) {
    Serial.print("Light Intensity: ");
    Serial.println(lightIntensity);

    // sending data light to topic MQTT
    String mqttTopicLight = "light_intensity_data";
    String payloadLight = String(lightIntensity);
    client.publish(mqttTopicLight.c_str(), payloadLight.c_str());
  }

  // Maintain MQTT connection
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  delay(1000); 
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client")) {
      Serial.println("Connected to MQTT broker");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" Retrying in 5 seconds...");
      // waiting time 5 scnd
      delay(5000);
    }
  }
}