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

// ===================== KONFIGURASI =====================
#define DHTPIN 4          // Pin data DHT22 (ubah sesuai wiring)
#define DHTTYPE DHT22

const char* ssid     = "Wokwi-GUEST";       // Ganti dengan SSID WiFi
const char* password = "";   // Ganti dengan password WiFi

const char* mqtt_server = "test.mosquitto.org";
const int   mqtt_port   = 1883;
const char* mqtt_client_id = "esp32-dht22-001"; // Harus unik

// Topic MQTT
const char* topic_suhu      = "esp32/azrial/suhu";
const char* topic_kelembaban = "esp32/azrial/kelembaban";
const char* topic_status    = "esp32/azrial/status";

// Interval kirim data (ms)
const long interval = 5000; // 5 detik
// =======================================================

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

unsigned long previousMillis = 0;

// ------------------- Koneksi WiFi -------------------
void setupWiFi() {
  Serial.print("Menghubungkan ke WiFi: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

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

  Serial.println("\nWiFi terhubung!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

// ------------------- Callback MQTT -------------------
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Pesan masuk [");
  Serial.print(topic);
  Serial.print("]: ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

// ------------------- Koneksi MQTT -------------------
void reconnectMQTT() {
  while (!client.connected()) {
    Serial.print("Menghubungkan ke MQTT broker...");
    if (client.connect(mqtt_client_id)) {
      Serial.println("Terhubung!");
      client.publish(topic_status, "ESP32 Online");
      // Subscribe jika perlu menerima perintah
      // client.subscribe("esp32/dht22/perintah");
    } else {
      Serial.print("Gagal, rc=");
      Serial.print(client.state());
      Serial.println(" - Coba lagi dalam 3 detik...");
      delay(3000);
    }
  }
}

// ------------------- Setup -------------------
void setup() {
  Serial.begin(115200);
  delay(100);

  dht.begin();
  setupWiFi();

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

// ------------------- Loop -------------------
void loop() {
  if (!client.connected()) {
    reconnectMQTT();
  }
  client.loop();

  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    float suhu = dht.readTemperature();
    float kelembaban = dht.readHumidity();

    if (isnan(suhu) || isnan(kelembaban)) {
      Serial.println("Gagal membaca sensor DHT22!");
      client.publish(topic_status, "ERROR: Sensor DHT22 gagal dibaca");
      return;
    }

    // Konversi ke string
    char bufSuhu[10], bufKelembaban[10];
    dtostrf(suhu, 4, 2, bufSuhu);
    dtostrf(kelembaban, 4, 2, bufKelembaban);

    // Publish ke MQTT
    client.publish(topic_suhu, bufSuhu);
    client.publish(topic_kelembaban, bufKelembaban);

    Serial.print("Suhu: ");
    Serial.print(suhu);
    Serial.print(" °C | Kelembaban: ");
    Serial.print(kelembaban);
    Serial.println(" %");
  }
}