#include <WiFi.h>
#include <HTTPClient.h>

// --- Pines del ESP32 ---
const int trigPin = 4;     // TRIG del HC-SR04
const int echoPin = 18;    // ECHO del HC-SR04
const int buzzerPin = 19;  // BZ1 del buzzer activo

long duration;
int distance;

// --- Configuración WiFi (Wokwi) ---
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// --- API ---
const char* apiurl = "https://arrangement-insulation-goat-luke.trycloudflare.com/api/iot";

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  
  Serial.begin(115200); // Para ver la distancia y el envío en la consola

  // Conectar al WiFi
  Serial.println("Conectando a WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\n✅ Conectado al WiFi!");
}

void loop() {
  // --- Medir distancia ---
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Distancia: ");
  Serial.print(distance);
  Serial.println(" cm");

  // --- Activar buzzer si distancia < 20 cm ---
  if (distance > 0 && distance < 20) {
    digitalWrite(buzzerPin, HIGH); // Enciende buzzer
  } else {
    digitalWrite(buzzerPin, LOW);  // Apaga buzzer
  }

  // --- Preparar JSON dinámico ---
  bool buzzerStatus = digitalRead(buzzerPin);
  String jsonData = "{";
  jsonData += "\"device_name\":\"ESP32 Entrada\",";
  jsonData += "\"location\":\"Puerta Principal\",";
  jsonData += "\"distance_cm\":" + String(distance) + ",";
  jsonData += "\"buzzer_status\":" + String(buzzerStatus ? "true" : "false") + ",";
  jsonData += "\"status\":\"online\"";
  jsonData += "}";

  // --- Enviar datos a la API ---
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(apiurl);  
    http.addHeader("Content-Type", "application/json");  
    int httpResponseCode = http.POST(jsonData);

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response: ");
      Serial.println(httpResponseCode);
      String response = http.getString();
      Serial.println("Server Response: " + response);
    } else {
      Serial.print("Error en POST: ");
      Serial.println(httpResponseCode);
    }
    http.end();
  } else {
    Serial.println("⚠️ WiFi desconectado!");
  }

  delay(1000); // Espera 1 segundo antes de la siguiente medición
}