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

#define DHTPIN 15        // Pin connected to the DHT22 sensor
#define DHTTYPE DHT22    // DHT22 sensor type

const char* ssid = "Wokwi-GUEST";  // Wokwi default Wi-Fi SSID
const char* password = "";         // No password needed for Wokwi

DHT dht(DHTPIN, DHTTYPE);
String apiKey = "EPU4MHFG3HLF7XYO";  // Your ThingSpeak Write API Key
const char* server = "api.thingspeak.com";

void setup() {
  Serial.begin(115200);  // Start serial communication
  WiFi.begin(ssid, password);  // Connect to Wokwi Wi-Fi

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  
  Serial.println("Connected to WiFi.");
  dht.begin();  // Start DHT sensor
}

void loop() {
  // Read temperature and humidity from DHT22 sensor
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  // If connected to WiFi, send data to ThingSpeak
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String url = String("http://") + server + "/update?api_key=" + apiKey + 
                 "&field1=" + String(temperature) + "&field2=" + String(humidity);

    http.begin(url);  // Start the HTTP connection
    int httpResponseCode = http.GET();  // Send the HTTP GET request

    if (httpResponseCode > 0) {
      String response = http.getString();
      Serial.println(httpResponseCode);  // Print response code
      Serial.println(response);  // Print response from server
    } else {
      Serial.println("Error on HTTP request");
    }

    http.end();  // Free resources
  }

  delay(15000);  // ThingSpeak has a rate limit of 15 seconds between updates
}