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

const char* SSID = "Wokwi-GUEST";
const char* PASSWORD = "";
const char* BROKER_MQTT = "mqtt-dashboard.com";
const int BROKER_PORT = 1883;

const char* LDR_topic = "TOPICO/LDR";
const char* lampada_topic = "TOPICO/lampada";

const int pinoRele = 2;
const int sensorLDR = 32;

int status = 0;
String statusLamp = "DESLIGADA";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  pinMode(pinoRele, OUTPUT);
  pinMode(sensorLDR, INPUT);
  Serial.begin(115200);

  setup_wifi();
  client.setServer(BROKER_MQTT, BROKER_PORT);
  client.setCallback(callback);
}

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.println("");
  Serial.println("Conectado ao WiFi");
  Serial.println("Endereço IP: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  String receivedTopic = String(topic);

  if (receivedTopic.equals(lampada_topic)) {
    if ((char)payload[0] == 'L') {
      digitalWrite(pinoRele, HIGH);
      status = 1;
      client.publish("kali/pinoRele", "O LED está aceso");
    }

    if ((char)payload[0] == 'l') {
      digitalWrite(pinoRele, LOW);
      status = 0;
      client.publish("kali/pinoRele", "O LED está apagado");
    }
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Tentando conexão MQTT...");
    String clientId = "ESP32Client";
    if (client.connect(clientId.c_str())) {
      Serial.println("Conectado ao servidor MQTT");
      client.subscribe(lampada_topic);
    } else {
      Serial.print("Falha, rc=");
      Serial.print(client.state());
      Serial.println(" Tentando novamente em 5 segundos");
      delay(5000);
    }
  }
}

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

  verificaStatusLamp();
}

void verificaStatusLamp() {
  int valorLDR = analogRead(sensorLDR);
  Serial.print("Valor do LDR: ");
  Serial.println(valorLDR);

  if (valorLDR > 500) {
    statusLamp = "DESLIGADA";
  } else {
    statusLamp = "LIGADA";
  }
}