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

// Wi-Fi
#define wifi_ssid "Wokwi-GUEST"
#define wifi_senha ""

// ThingSpeak
unsigned long canal = 34342;
const char *chaveEscrita = "RPVYR5VW7A0U6X9T";
const char *url = "http://api.thingspeak.com/update";

DHT dht(2, DHT22);

// Criação do cliente MQTT
WiFiClient clienteEsp;
HTTPClient http;

void wifi_conexao() {
  WiFi.mode(WIFI_STA);
  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("\nERRO: Falha na conexão ao Wi-Fi");
  }
  else {
    Serial.print("\nConectado. IP: ");
    Serial.println(WiFi.localIP());
  }
}

void setup() {
  Serial.begin(115200);
  dht.begin();
  wifi_conexao();
}

void loop() {
  delay(2000);
  float umid = dht.readHumidity();
  float temp = dht.readTemperature();

  Serial.print("Umidade: ");
  Serial.print(umid);
  Serial.print(" %\t");
  Serial.print("Temperatura: ");
  Serial.print(temp);
  Serial.print(" °C\n");

  http.begin(clienteEsp, url);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  String httpDados = "api_key=" + String(chaveEscrita) + 
    "&field1=" + String(temp) + "&field2=" + String(umid);           
  int res = http.POST(httpDados);
  if(res == 200) {
    Serial.println("Envio realizado com sucesso!");
  } 
  else {
    Serial.println("Erro " + String(res) + " ao enviar!");
  }
  delay(60000);
}