#include "DHT.h"

#define DHTPIN 21
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

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

// Credenciais para acesso à rede e ao MQTT Mosquitto.
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

WiFiClient WOKWI_Client;
PubSubClient client(WOKWI_Client);

long lastMsg = 0;
long scanSensores = 0;
char msg[50];
float temperature;

// ---- CONECTA AO WIFI ----
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("\nWiFi connected");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
}

// ---- CALLBACK MQTT ----
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Mensagem recebida no tópico: ");
  Serial.println(topic);
}

// ---- RECONNECT MQTT ----
void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");

    if (client.connect("WOKWI_Client")) {
      Serial.println("connected");

      client.subscribe("Python_MQTT");   // <<< FALTAVA O ;
      
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" — try again in 5 seconds");
      delay(5000);
    }
  }
}

// ---- LEDS DE STATUS ----
void Conectado_WiFi() {
  if (WiFi.status() == WL_CONNECTED)
    digitalWrite(2, HIGH);
  else
    digitalWrite(2, LOW);
}

void Conectado_Mosquitto() {
  if (client.connected())
    digitalWrite(15, HIGH);
  else
    digitalWrite(15, LOW);
}

// ---- LEITURA DO SENSOR ----
void leSensores() {
  temperature = dht.readTemperature();
}

void setup() {
  pinMode(2, OUTPUT);
  pinMode(15, OUTPUT);
  Serial.begin(115200);

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  Serial.println(F("DHTxx test!"));
  dht.begin();
}

void loop() {

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

  Conectado_WiFi();
  Conectado_Mosquitto();

  client.loop();

  long now = millis();

  // Leituras do sensor
  if (now - scanSensores > 450) {
    scanSensores = now;
    leSensores();
  }

  // Publish MQTT
  if (now - lastMsg > 1000) {
    lastMsg = now;

    char tempString[8];
    dtostrf(temperature, 1, 2, tempString);

    Serial.print("Temperature: ");
    Serial.println(tempString);

    client.publish("Python_MQTT", tempString);   // <<< FALTAVA ;
  }
}