// Referência:
// https://medium.com/engineering-iot/connecting-esp32-to-hivemq-for-real-time-iot-data-streaming-with-mqtt-8813f48cb1a4

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

#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define wifi_ssid "Wokwi-GUEST"
#define wifi_senha ""

#define NTP_SERVER "pool.ntp.org"
#define UTC_OFFSET 0
#define UTC_OFFSET_DST 0

const char *mqtt_servidor = "ac15cc038fc44e1d89ea8ff01708c3bd.s1.eu.hivemq.cloud";
const int   mqtt_porta = 8883;
const char *mqtt_usuario = "hivemq.webclient.1763425147712";
const char *mqtt_senha = "L4v#lKDrQ08<1S&gEo,m";

static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
)EOF";

#define topico_temp "dhtclaudio/temperatura"
#define topico_umid "dhtclaudio/umidade"

WiFiClientSecure clienteEsp;
PubSubClient cliente(clienteEsp);

void setup() {
  Serial.begin(9600);
  dht.begin();
  setup_wifi();
  setDateTime();
  //clienteEsp.setInsecure();
  clienteEsp.setCACert(root_ca);
  cliente.setServer(mqtt_servidor, mqtt_porta);
  delay(2000);
}

void setDateTime() {
  configTime(UTC_OFFSET, UTC_OFFSET_DST, NTP_SERVER);
  printLocalTime();
}

void printLocalTime(){
  struct tm timeinfo;
  if(!getLocalTime(&timeinfo)) {
    Serial.println("Failed to obtain time");
  }
  //Serial.println(&timeinfo, "%A, %B %d %Y %H:%M:%S");
  time_t tt = time(NULL);
  struct tm data = *gmtime(&tt);    
  char data_formatada[64];
  strftime(data_formatada, 64, "%d/%m/%Y %H:%M:%S", &data);
  Serial.println(data_formatada);
}

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Conectando a ");
  Serial.println(wifi_ssid);

  WiFi.begin(wifi_ssid, wifi_senha);

  int tentar = 0;
  while (WiFi.status() != WL_CONNECTED && tentar < 40) {
    delay(500);
    Serial.print(".");
    tentar++;
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("\nFalha na conexão ao Wi-Fi");
    while (1) {
      delay(1000);
    }
  }

  Serial.println("\nConectado. IP: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  Serial.print("Umidade: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperatura: ");
  Serial.print(t);
  Serial.print(" °C\n");
  while (!cliente.connected()) {
    if (cliente.connect("Claudio-ESP32", mqtt_usuario, mqtt_senha)) {
      Serial.println("MQTT: Conectado"); 
    }
    else {
      Serial.print("Erro MQTT: ");
      Serial.println(cliente.state());
      delay(2000);
    }
  }
  Serial.print("MQTT: Enviando...");
  cliente.publish(topico_temp, String(t).c_str(), true);
  cliente.publish(topico_umid, String(h).c_str(), true);
  cliente.disconnect();
  Serial.println("Concluído.");
  delay(120000); // 2 minutos
}