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

// Firebase config
#define FIREBASE_HOST "https://nhet-9909b-default-rtdb.firebaseio.com/" // Firebase URL
#define FIREBASE_AUTH "1JQ2ymw72vUk4kdfYs1LZxch9GPfgmVykoHgSkBh"         // Firebase Auth Key

// Wi-Fi config
#define WIFI_SSID "Wokwi-GUEST" // Wi-Fi name
#define WIFI_PASSWORD ""        // Wi-Fi password (public network)

// DHT sensor config
#define DHTPIN 4               // GPIO pin connected to DHT22 sensor
#define DHTTYPE DHT22           // Specify DHT sensor type (DHT11 or DHT22)

DHT dht(DHTPIN, DHTTYPE);       // Create a DHT object

// Variables to store temperature and humidity
float temperature = 0.0;
float humidity = 0.0;

void connectWiFi() {
  Serial.print("Connecting to Wi-Fi...");
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println(" Connected!");
}

void sendDataToFirebase(float temp, float hum) {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    // Combine data into a single JSON payload
    String url = String(FIREBASE_HOST) + "/SensorData.json?auth=" + FIREBASE_AUTH;
    http.begin(url);
    http.addHeader("Content-Type", "application/json");

    String payload = "{\"temperature\": " + String(temp) + ", \"humidity\": " + String(hum) + "}";
    int httpCode = http.POST(payload);

    Serial.print("HTTP Response Code: ");
    Serial.println(httpCode);

    http.end();
  } else {
    Serial.println("Wi-Fi not connected!");
  }
}

void setup() {
  Serial.begin(115200);
  connectWiFi();
  dht.begin(); // Initialize DHT sensor
}

void loop() {
  // Read temperature and humidity using DHT library
  humidity = dht.readHumidity();
  temperature = dht.readTemperature();

  // Check if reading was successful
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
  } else {
    Serial.print("Temperature: ");
    Serial.print(temperature);
    Serial.print(" °C, Humidity: ");
    Serial.print(humidity);
    Serial.println(" %");

    // Send data to Firebase
    sendDataToFirebase(temperature, humidity);
  }

  delay(5000); // Wait 5 seconds before the next read
}