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

// --- Network Configuration ---
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// --- Firebase Configuration ---

String firebaseHost = "https://dash--board-iot-default-rtdb.asia-southeast1.firebasedatabase.app/"; 

// --- Hardware Pins ---
#define LED_PIN 2      
#define DHT_PIN 4      
#define DHTTYPE DHT11  

DHT dht(DHT_PIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  
  pinMode(LED_PIN, OUTPUT);
  dht.begin();

  // --- Connect to Wi-Fi ---
  Serial.print("Connecting to Wi-Fi");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nConnected successfully!");
}

void loop() {
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;

    // --- 1. UPLOAD DATA (Nhiệt độ & Độ ẩm) ---
    float t = dht.readTemperature();
    float h = dht.readHumidity();

    if (!isnan(t) && !isnan(h)) {
 
      String jsonData = "{\"nhietdo\":" + String(t, 1) + 
                        ",\"doam\":" + String(h, 1) + "}";

      http.begin(firebaseHost + "/cambien.json"); 
      http.addHeader("Content-Type", "application/json");
      
      int patchCode = http.PATCH(jsonData); 
      if (patchCode > 0) Serial.println("Upload Success!");
      else Serial.println("Upload Failed: " + String(patchCode));
      
      http.end();
    }

    // --- 2. DOWNLOAD DATA (Điều khiển LED) ---
    http.begin(firebaseHost + "/dieukhien.json");
    int getCode = http.GET();

    if (getCode == 200) {
      String payload = http.getString();
      Serial.println("Received: " + payload);

      // Logic kiểm tra chuỗi đơn giản
      if (payload.indexOf("\"button\":\"ON\"") != -1) {
        digitalWrite(LED_PIN, HIGH);
        Serial.println("LED is ON");
      } else {
        digitalWrite(LED_PIN, LOW);
        Serial.println("LED is OFF");
      }
    }
    http.end();
  }

  delay(5000); // Đợi 5 giây mỗi lần lặp
}