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

const int DHT_PIN = 15;
DHTesp dht;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.emqx.io";

#define LED 26

WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);

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

  Serial.println();
  Serial.println("WiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");
  String data = "";
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
    data += (char)payload[i];
  }
  Serial.println();
  Serial.print("Message size: ");
  Serial.println(length);
  Serial.println("-----------------------");
  Serial.println(data);

  if (String(topic) == "LED5211") {
    if (data == "ON") {
      digitalWrite(LED, HIGH);
      Serial.println("LED ON");
    } else {
      digitalWrite(LED, LOW);
      Serial.println("LED OFF");
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    String clientId = "ESP32Client-1800";  // ClientID tetap

    // Connect dengan cleanSession = false
    if (client.connect(clientId.c_str(), NULL, NULL, NULL, 0, true, NULL, false)) {
      Serial.println("Connected to MQTT broker");
      client.subscribe("LED5211");
      client.publish("/ThinkIOT/Publish", "IOT PRAKTIK");
    } else {
      Serial.print("Failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  pinMode(LED, OUTPUT);
  Serial.begin(115200);

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  client.setKeepAlive(60);  // Perpanjang keepAlive jadi 60 detik
  dht.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() {
  if (!client.connected()) {
    Serial.print("MQTT Disconnected, State: ");
    Serial.println(client.state()); // Debug status koneksi
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 100) {
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity();

    String temp = String(data.temperature, 2);
    client.publish("suhu1800", temp.c_str());

    String hum = String(data.humidity, 1);
    client.publish("humid1800", hum.c_str());

    Serial.print("Temperature: ");
    Serial.println(temp);
    Serial.print("Humidity: ");
    Serial.println(hum);
  }
}