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

/* ======= WIFI (WOKWI) ======= */
const char* ssid = "Wokwi-GUEST";
const char* password = "";

/* ======= MQTT (HIVEMQ – NUVEM) ======= */
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* mqtt_topic = "sala/status";

/* ======= PINOS ======= */
#define DHTPIN 15
#define DHTTYPE DHT22
#define PIR_PIN 4
#define BUZZER_PIN 18

DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);

/* ======= CONTROLE DE TEMPO ======= */
unsigned long lastMotionTime = 0;
const unsigned long noMotionDelay = 15000; // 15 segundos
bool salaVaziaEnviada = false;

/* ======= CONEXÃO WIFI ======= */
void setup_wifi() {
  delay(10);
  Serial.print("Conectando ao WiFi (Wokwi)");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nWiFi conectado");
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

/* ======= CONEXÃO MQTT ======= */
void reconnect_mqtt() {
  while (!client.connected()) {
    Serial.print("Conectando ao broker MQTT...");
    if (client.connect("ESP32-Wokwi-Sala")) {
      Serial.println("Conectado ao HiveMQ");
    } else {
      Serial.print("Falha, rc=");
      Serial.print(client.state());
      Serial.println(" tentando novamente em 3s");
      delay(3000);
    }
  }
}

void setup() {
  Serial.begin(115200);

  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  digitalWrite(BUZZER_PIN, LOW);

  dht.begin();

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);

  lastMotionTime = millis();
}

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

  int motionDetected = digitalRead(PIR_PIN);

  if (motionDetected == HIGH) {
    Serial.println("Movimento detectado!");
    lastMotionTime = millis();
    digitalWrite(BUZZER_PIN, LOW);
    salaVaziaEnviada = false;

    client.publish("sala/movimento", "Movimento detectado");
  }

  if ((millis() - lastMotionTime > noMotionDelay) && !salaVaziaEnviada) {
    digitalWrite(BUZZER_PIN, HIGH);
    Serial.println("Sala Vazia");

    client.publish("sala/status", "Sala Vazia");
    salaVaziaEnviada = true;
  }

  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  if (!isnan(humidity) && !isnan(temperature)) {
    char payload[64];
    snprintf(payload, sizeof(payload),
             "Temp: %.1f C | Umidade: %.1f %%", temperature, humidity);

    Serial.println(payload);
    client.publish("sala/clima", payload);
  } else {
    Serial.println("Erro ao ler DHT22");
  }

  delay(2000);
}