#include <WiFi.h>
#include <PubSubClient.h>
// Pines del sensor de ultrasonidos
#define LED_BUILTIN 14
#define GPIO_A0 34



 // Punto de acceso wifi al que se conecta el dispositivo
 char ssid[] = "Wokwi-GUEST"; // your network SSID Name
 char pass[] = ""; // your network password

 int status = WL_IDLE_STATUS;
 WiFiClient wifi_client;

const char* mqtt_server = "mqtt-dashboard.com";
const int mqtt_port = 1883;

PubSubClient mqttClient(wifi_client);

void reconnect() {
  Serial.println("Connecting to MQTT Broker...");
  while (!mqttClient.connected()) {
      Serial.println("Reconnecting to MQTT Broker..");
      String clientId = "ESP32Client-";
      clientId += String("sefsefsefaesf");

      
      mqttClient.setKeepAlive(60);
      
      if (mqttClient.connect(clientId.c_str())) {
        Serial.println("Connected.");
        //mqttClient.subscribe("/ugr/#");
      }else{
        Serial.println("Not connected.");
      }
  }
}


void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Callback - ");
  Serial.print("Message:");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
}

void setupMQTT() {
  mqttClient.setServer(mqtt_server, mqtt_port);
  // set the callback function
  mqttClient.setCallback(callback);
}

void setup() {
 Serial.begin(9600);
 pinMode ( LED_BUILTIN, OUTPUT );
//Conexión a la WiFi y al cloud
 WiFi.begin(ssid, pass);
 setupMQTT();
 delay(500);
 pinMode(GPIO_A0,INPUT);                 
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  delay(500);
  digitalWrite(LED_BUILTIN, LOW);
  // Medida de la distancia
  delayMicroseconds(10);

  // These constants should match the photoresistor's "gamma" and "rl10" attributes
  const float GAMMA = 0.7;
  const float RL10 = 50;

  // Convert the analog value into lux value:
  int analogValue = analogRead(GPIO_A0);
  float voltage = analogValue / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));

  // Visualización por el puerto serie
  Serial.print("Iluminacion: ");
  Serial.println(lux); 


  if (!mqttClient.connected())
    reconnect();

  String mensaje = String(lux);
  mqttClient.publish("ugr/josep/wokwi/iluminacion", mensaje.c_str());


  delay(5000);
}