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

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

/* ===== MQTT ===== */
const char* mqtt_server = "broker.hivemq.com";
const int mqtt_port = 1883;
const char* mqtt_topic = "projeto/uniforme/alert";

/* ===== HARDWARE ===== */
const int ledPin = 2;      // LED onboard
const int buzzerPin = 15;  // buzzer ativo

WiFiClient espClient;
PubSubClient client(espClient);

/* ===== CONTROLE DO ALARME ===== */
unsigned long alarmStart = 0;
bool alarmActive = false;
const unsigned long ALARM_DURATION = 1000; // ms

/* ===== CALLBACK MQTT ===== */
void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Mensagem recebida [");
  Serial.print(topic);
  Serial.print("]: ");

  for (unsigned int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();

  // Ativa alarme
  digitalWrite(ledPin, HIGH);
  tone(buzzerPin, 2000);
  alarmActive = true;
  alarmStart = millis();
}

/* ===== CONEXÃO MQTT ===== */
void reconnect() {
  while (!client.connected()) {
    Serial.print("Conectando ao MQTT...");
    String clientId = "ESP32-" + String(random(0xffff), HEX);

    if (client.connect(clientId.c_str())) {
      Serial.println(" conectado!");
      client.subscribe(mqtt_topic);
    } else {
      Serial.print(" falhou, rc=");
      Serial.print(client.state());
      Serial.println(" tentando novamente...");
      delay(2000);
    }
  }
}

/* ===== SETUP ===== */
void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  Serial.begin(115200);

  // Conecta WiFi
  Serial.print("Conectando ao WiFi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi conectado!");
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());

  // Configura MQTT
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

/* ===== LOOP ===== */
void loop() {
  if (!client.connected()) {
    reconnect();
  }

  client.loop();

  // Desliga alarme sem bloquear
  if (alarmActive && millis() - alarmStart >= ALARM_DURATION) {
    noTone(buzzerPin);
    digitalWrite(ledPin, LOW);
    alarmActive = false;
  }
}