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

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

// --- HCSR04 ---
const int trigPin = 5;
const int echoPin = 18;

// ---  LEDs ---
const int LED_BAIXO = 23;
const int LED_MEDIO = 22;
const int LED_ALTO = 21;

// --- Node-RED ---
const char* serverName = "http://127.0.0.1:1880/nivel";  // Substitua pelo IP do seu Node-RED

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

  // Inicia pinos do sensor
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Inicia pinos dos LEDs
  pinMode(LED_BAIXO, OUTPUT);
  pinMode(LED_MEDIO, OUTPUT);
  pinMode(LED_ALTO, OUTPUT);

  // Conecta ao Wi-Fi
  setup_wifi();
}

void loop() {
  float distance = getDistance();
  Serial.print("Distância: ");
  Serial.print(distance);
  Serial.println(" cm");

  String level = checkLevel(distance);
  level="123";                                     //Forçado
 // if (level != "") {                            //comentado
    sendLevelToServer(level);
 // }                                              //comentado

  delay(2000); // Medição a cada 2s
}

// --- FUNÇÃO WIFI ---
void setup_wifi() {
  Serial.print("Conectando a ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi conectado");
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

// --- FUNÇÃO SENSOR ---
float getDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;

  return distance;
}

// --- FUNÇÃO CHECA NÍVEL E CONTROLA LEDs ---
String checkLevel(float distance) {
  // Desliga todos os LEDs antes
  digitalWrite(LED_BAIXO, LOW);
  digitalWrite(LED_MEDIO, LOW);
  digitalWrite(LED_ALTO, LOW);

  String level = "";

  if (distance <= 17.0) {
    digitalWrite(LED_BAIXO, HIGH);
    level = "BAIXO";
  } else if (distance > 17.0 && distance <= 27.0) {
    digitalWrite(LED_MEDIO, HIGH);
    level = "MEDIO";
  } else if (distance > 27.0 && distance <= 43.0) {
    digitalWrite(LED_ALTO, HIGH);
    level = "ALTO";
  } else {
    Serial.println("TRANSBORDOU/BRUMADINHO2");
  }

  Serial.print("Nível: ");
  Serial.println(level);

  return level;
}

// --- FUNÇÃO LOGICA PARA NODE-RED ---
void sendLevelToServer(String level) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String serverPath = serverName;
    serverPath += "?level=" + level;

    http.begin(serverPath);
    Serial.print("HTTP/GET Message: ");
    Serial.println(serverPath);
    int httpResponseCode = http.GET();

    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: ");
      Serial.println(httpResponseCode);
    } else {
      Serial.print("Erro HTTP: ");
      Serial.println(httpResponseCode);
    }

    http.end();
  } else {
    Serial.println("WiFi Desconectado");
  }
}