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

const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* mqtt_server = "66.29.142.107";
const int relay1 = 2;
const int relay2 = 15;

WiFiClient espClient;

PubSubClient client(espClient);

long lastMsg = 0;

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  pinMode(relay1, OUTPUT);
  pinMode(relay2, OUTPUT);
}

void setup_wifi() {
  delay(10);

  Serial.println();
  Serial.print("Conectando a ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Intentando conectar a MQTT broker...");
    if (client.connect("ESP32Client")) {
      Serial.println("conectado");
      client.subscribe("relay1");
      client.subscribe("relay2");
    } else {
      Serial.print("fallido, rc=");
      Serial.print(client.state());
      Serial.println(" intente de nuevo en 5s");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Mensaje recibido en el tópico: ");
  Serial.print(topic);
  Serial.print(". Mensaje: ");

  String messageTemp;

  for (int i=0; i<length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char) message[i];
  }
  Serial.println();

  if (String(topic) == "relay1") {
    Serial.print("Cambiando salida a: ");
    if (messageTemp == "on") {
      Serial.println("on");
      digitalWrite(relay1, HIGH);
    }
    else if (messageTemp == "off") {
      Serial.println("off");
      digitalWrite(relay1, LOW);
    }
  }

  if (String(topic) == "relay2") {
    Serial.print("Cambiando salida a: ");
    if (messageTemp == "on") {
      Serial.println("on");
      digitalWrite(relay2, HIGH);
    }
    else if (messageTemp == "off") {
      Serial.println("off");
      digitalWrite(relay2, LOW);
    }
  }
}

void loop() {
  if (!client.connected())
    reconnect();
  client.loop();

  long now = millis();
  if (now - lastMsg > 2000)
    lastMsg = now;
}