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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";

// Variáveis para o ESP32 receber os valores
String my_payload;
String my_topic;

WiFiClient WOKWI_Client;
PubSubClient client(WOKWI_Client);

void setup_wifi() {
  delay(10);
  // Conectando à rede WiFi
  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.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  my_payload = "";  // Limpar o payload antes de começar a concatenar
  for (int i = 0; i < length; i++) {
    my_payload += (char)payload[i]; // Concatenando 
  }
  my_topic = topic;
}

void reconnect() {
  // Loop até reconectar
  while (!client.connected() && WiFi.status() == WL_CONNECTED) {
    Serial.print("Attempting MQTT connection...");

    if (client.connect("Wokwi-Client")) {
      Serial.println("connected");
      client.subscribe("ESP32_ASSINA");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void CONECTA_WIFI() {
  if (WiFi.status() == WL_CONNECTED)
    digitalWrite(2, HIGH);
  else
    digitalWrite(2, LOW);
}

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

void RECEBE() {
  if (my_payload.equals("A"))
    digitalWrite(19, HIGH);
  else if (my_payload.equals("a"))
    digitalWrite(19, LOW);
}

void setup() {
  pinMode(2, OUTPUT); 
  pinMode(15, OUTPUT);
  pinMode(19, OUTPUT);    
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    reconnect();
    client.loop();
    CONECTA_WIFI();
    CONECTA_MQTT();
    RECEBE();  // Verificar o valor recebido e acionar o LED
  } else {
    setup_wifi();  // Tentar reconectar ao WiFi se a conexão for perdida
  }
  
  delay(10); // Adiciona um pequeno delay para estabilidade
}