// Exemplo de Sensor de luminosidade
#define LED 12


//////###configuração do LDR
#define LDR_PIN 34 ///define o pino de leitura do fotoresistor
// LDR Characteristics
// Essas constantes devem corresponder aos atributos "gama" e "rl10" do fotoresistor
const float GAMMA = 0.7;
const float RL10 = 33;
int valorAnterior = 0; // Variável para armazenar o valor anterior
float lux=0;
#include <WiFi.h>
#include <PubSubClient.h>
// Replace the next variables with your SSID/Password combination
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "test.mosquitto.org";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
long scanSensores = 0;
char msg[50];
int value = 0;
float temperature;
float humidity;

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  
  delay(500);

  Serial.begin(115200);
  Serial.println("OI, ANA ABRR!");
  pinMode(LED, OUTPUT);
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LED, OUTPUT);
//conectawifi();
}

void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  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* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();
  if (String(topic) == "luminosidade/AMT") {
    Serial.print("Changing output to ");
    if(messageTemp == "on"){
      Serial.println("on");
      //digitalWrite(led, HIGH);
    }
    else if(messageTemp == "off"){
      Serial.println("off");
      //digitalWrite(led, LOW);
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("projiluminosidadeAMT")) {
      Serial.println("connected");
      // Subscribe
      client.subscribe("luminosidade/AMT");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}


void loop() {

  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  long now = millis();
  if (now - lastMsg > 1000) {//PUBLICA A CADA SEGUNDO
    lastMsg = now;

int luminosidade=map(analogRead(34),0,4095,0,100);

    // Convert the value t a char array
    char lumString[8];
    dtostrf(luminosidade, 1, 2, lumString);
    Serial.print("luminosidade: ");
    Serial.println(lumString);
    client.publish("luminosidade/LDR", lumString);
   /* 
    //myString.toCharArray(buf, len)
    char s_temp[]={};
    unsigned int len = 10;
    String s_Chave="";
    if(statusChaveLedRed){
      s_Chave = "Ligada";
      } else {
      s_Chave = "Desligada";
    }
    s_Chave.toCharArray(s_temp,len);
    client.publish("sematec23/chaveX",s_temp);
    Serial.print("Status_chave: ");
    Serial.println(s_temp);
    */
  }
  // put your main code here, to run repeatedly:

  float iluminacao =  fotoresistor();

  delay(10); // this speeds up the simulation


}


float  fotoresistor()
{
  int analogValue = analogRead(LDR_PIN);
  //Serial.println(analogValue);
  ////só faz a leitura se houver uma alteração no valor
   if (analogValue != valorAnterior) {
   


  float voltage = analogValue / 4096. * 3.3;
  float resistance = 2000 * voltage / (1 - voltage / 3.3);
   lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));


  Serial.print("Ambiente: ");


  ///Iluminação do escritório valor 400
  if (lux > 400) {
    Serial.println("Claro!");
    digitalWrite(LED, LOW);
  } else {
    Serial.println("Escuro  ");
    digitalWrite(LED, HIGH);
  }


    Serial.print("Luminosidade: ");
  Serial.println(lux);


  // Atualiza o valor anterior com o novo valor
    valorAnterior = analogValue;
  }
  return lux;
}