#include <WiFi.h> //konektifitas ke wifi
#include <PubSubClient.h> //publisher n subscriber to broker
#include <DHTesp.h>

#define BUFFER_SIZE 50 //ukuran payload

DHTesp dhtSensor;

const char* ssid = "Wokwi-GUEST";
const char* pass = "";
const int pin_dht = 15;

const char* broker = "broker.mqttdashboard.com";
const char* topic = "";
// general_type/sub_type/sensor
// monitoring/room/suhu
// monitoring/kitchen/suhu


WiFiClient espClient; //wifi
PubSubClient client(espClient); //koneksi ke wifi -> baru connect ke broker
unsigned long lastMsg = 0; 
char msg[BUFFER_SIZE]; //payload
int value = 0;

void setupWifi(){
  delay(10);
  Serial.println("connection...");
  Serial.println(ssid);

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

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

  randomSeed(micros());
  Serial.println("Connected !");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length){
  Serial.print("msg arrived !");
  Serial.println(topic);
  for(int i = 0; i < length; i++){
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32-"; // client id cant be same
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      // Once connected, publish an announcement...
      client.publish(topic, "Starting...");
      // ... and resubscribe
      client.subscribe(topic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  setupWifi();
  client.setServer(broker, 1883);
  client.setCallback(callback);

  dhtSensor.setup(pin_dht, DHTesp::DHT22);
}

void loop() {
  // put your main code here, to run repeatedly:
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
 Serial.println("Temp: " + String(data.temperature, 2) + "°C");
 Serial.println("Humidity: " + String(data.humidity, 1) + "%");

  unsigned long now = millis();
  if (now - lastMsg > 1000) {
    lastMsg = now;
    snprintf(msg, BUFFER_SIZE, "%f.2,%f.2",data.temperature, data.humidity);
    // snprintf(msg, BUFFER_SIZE, "temperature: #%f.2, humidity: #%f.2", data.temperature,data.humidity);
    Serial.print("Publish message: ");
    Serial.println(msg);
    client.publish(topic, msg);
  }
  delay(1000);
}