#include <Wire.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>
#include <WiFi.h>
#include <PubSubClient.h>

Adafruit_MPU6050 mpu;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "3d27fb1b480a431988a1215963de401a.s1.eu.hivemq.cloud:8883";
const int mqttPort = 8883;
const char* mqttUser = "user1";
const char* mqttPassword = "User1234";

WiFiClient espClient;
PubSubClient client(espClient);

void conectarWiFi() {
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Conectando ao WiFi...");
  }
  Serial.println("WiFi conectado");
}

void conectarMQTT() {
  client.setServer(mqttServer, mqttPort);
  while (!client.connected()) {
    Serial.println("Conectando ao broker MQTT...");
    if (client.connect("ESP32Client", mqttUser, mqttPassword)) {
      Serial.println("Conectado ao MQTT");
    } else {
      delay(2000);
    }
  }
}

void enviarAlerta() {
  if (!client.connected()) {
    conectarMQTT();
  }
  client.publish("alerta/queda", "Queda detectada!" );
}

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

  if (!mpu.begin()) {
    Serial.println("Falha ao inicializar o sensor MPU6050");
    while (1);
  }

  conectarWiFi();
  conectarMQTT();

  mpu.setAccelerometerRange(MPU6050_RANGE_8_G);
}

void loop() {
  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  float magnitude = sqrt(a.acceleration.x * a.acceleration.x +
                         a.acceleration.y * a.acceleration.y +
                         a.acceleration.z * a.acceleration.z);

  if (magnitude > 2.5) {
    Serial.println("Queda detectada!");
    enviarAlerta();
  }

  delay(100);
}