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

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define WIFI_CHANNEL 1
int status = WL_IDLE_STATUS;

const char* mqtt_server = "test.mosquitto.org";
const char* my_topic_SUB = "FIT/SUB";
const char* my_topic_PUB = "FIT/PUB";

WiFiClient espClient;
PubSubClient client(espClient);

int contador = 1;
char mensagem[30];
unsigned long lastMillis = 0;

int PIR_SENSOR_PIN = 35;
int PIR_SENSOR_STATUS = 0;
int previousStatus = -1;
unsigned long lastChangeTime = 0;

int led = 12;

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(PIR_SENSOR_PIN, INPUT);
  pinMode(led, OUTPUT);
  conectaWifi();

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop() {
  int movimento = SensorMovimento();
  delay(10);

  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  delay(100);

  if (millis() - lastMillis > 15000) {
    lastMillis = millis();
    sprintf(mensagem, "%d", movimento);
    Serial.print("Mensagem enviada: ");
    Serial.println(mensagem);
    client.publish(my_topic_PUB, mensagem);
    Serial.print(contador);
    Serial.println("-Mensagem enviada com sucesso...");
    contador++;
  }
}

int SensorMovimento() {
  PIR_SENSOR_STATUS = digitalRead(PIR_SENSOR_PIN);
  if (PIR_SENSOR_STATUS != previousStatus) {
    previousStatus = PIR_SENSOR_STATUS;
    if (PIR_SENSOR_STATUS != 0) {
      Serial.println("Movimento detectado");
      digitalWrite(led, HIGH);
    } else {
      Serial.println("Sem movimento");
      digitalWrite(led, LOW);
    }
  }
  return previousStatus;
}

void conectaWifi() {
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);
  Serial.print("Conectando ao WiFi ");
  Serial.print(WIFI_SSID);
  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(topic);
  Serial.print("] ");
  for (int i = 0; i < length; i++) {
    string += ((char)payload[i]);
  }
  Serial.print(string);
}

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(" Tentando novamente em 5 segundos");
      delay(5000);
    }
  }
}