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

///########### configuração do wifi
#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
// Defining the WiFi channel speeds up the connection:
#define WIFI_CHANNEL 6
int status = WL_IDLE_STATUS;     // the Wifi radio's status

///########## configuração do MQTT
const char* mqtt_server = "test.mosquitto.org";// MQTT broker
char* my_topic_SUB = "FIT/SUB";// the chosen topic
char* my_topic_PUB = "FIT/PUB";// the chosen topic

/////##### configuração do wifi e MQTT
WiFiClient espClient;
PubSubClient client(espClient);

/////###configuração do tempo de leitura
int contador = 1;
char mensagem[30];
unsigned long lastMillis = 0;

int LED = 2;
int LED2 = 4;
int PIR_SENSOR_PIN = 14;
int PIR_SENSOR_STATUS=0;
int ultimovalor=0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LED, OUTPUT);
  pinMode(LED2, OUTPUT);
   conectawifi();
  client.setServer(mqtt_server, 1883); // Set the MQTT broker server and port
  client.setCallback(callback); // Set the callback function for incoming MQTT messages

}

void loop() {
  // Check MQTT connection and process incoming messages
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
 delay(100); // Add a delay to avoid flooding the MQTT broker with messages
 
  PIR_SENSOR_STATUS= digitalRead(PIR_SENSOR_PIN);

  if(PIR_SENSOR_STATUS != ultimovalor)
  {
    Serial.print(PIR_SENSOR_STATUS);
    if(PIR_SENSOR_STATUS==0)
    {
      Serial.println("- Sem movimento");
      digitalWrite(LED, LOW);
     
       // Define
        String str = "Sem movimento";

        // Length (with one extra character for the null terminator)
        int str_len = str.length() + 1;

        // Prepare the character array (the buffer)
        mensagem[str_len];

        // Copy it over
        str.toCharArray(mensagem, str_len);
        client.publish(my_topic_PUB, mensagem);
           
  Serial.print("Mensagem enviada: ");
  Serial.println(mensagem);
    }
    else{
      Serial.println("- Movimento detectado");
      digitalWrite(LED, HIGH);
        // Define
      String str2 = "Movimento detectado";

      // Length (with one extra character for the null terminator)
      int str_len = str2.length() + 1;

      // Prepare the character array (the buffer)
      char mensagem2[str_len];
      client.publish(my_topic_PUB, mensagem2);
         
  Serial.print("Mensagem enviada: ");
  Serial.println(mensagem);
    }

  //Envia a mensagem ao broker
  //client.publish(my_topic_PUB, mensagem);
  Serial.print(contador);
  Serial.println("-Mensagem enviada com sucesso...");
 
  //Incrementa o contador
  contador++;
    ultimovalor=PIR_SENSOR_STATUS;
  }
}

void conectawifi()
  {
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);
  Serial.print("Conectando ao WiFi ");
  Serial.print(WIFI_SSID);
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println(" Conectado!");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  }

void callback(char* topic, byte* payload, unsigned int length) {
  String string;
  Serial.print("Chegou a mensagem [");
  Serial.print(my_topic_SUB);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    string+=((char)payload[i]);  
  }
  Serial.print(string);
  if(string == "1"){
    digitalWrite(LED2, HIGH);
  }
  if(string == "0"){
    digitalWrite(LED2, LOW);
  }
}
// Attempt to reconnect to the MQTT broker if the connection is lost
void reconnect() {
  while (!client.connected()) {
    Serial.print("Tentando conectar ao MQTT ...");
    if (client.connect("ESPClient")) {
      Serial.println("Conectado");
      client.subscribe(my_topic_SUB);
    } else {
      Serial.print("falhou, rc=");
      Serial.print(client.state());
      Serial.println(" Tente novamente em 5 segundos");
  }
  }
}