#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>
#include <LiquidCrystal_I2C.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* FIREBASE_HOST = "apptest-5902a-default-rtdb.firebaseio.com";
const char* FIREBASE_AUTH = "nTGibi8QdazgLBdSoSzic1jWyEzv6sjYQOOS0jHK";
const char* databaseURL = "https://apptest-5902a-default-rtdb.firebaseio.com/data.json";

#define DHT_PIN 5  // GPIO pin connected to the DHT22 sensor
#define LED_PIN 25


DHT dht(DHT_PIN, DHT22);

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
int buttonLedState = HIGH;
int ledstate = 0;



void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
  dht.begin();
  pinMode(LED_PIN, OUTPUT);

  digitalWrite(LED_PIN,LOW);

  lcd.init();
  lcd.backlight();
}

void loop() {
  delay(1000); // Wait for sensor to stabilize
  
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();



  if (!isnan(humidity) && !isnan(temperature)) {
    Serial.printf("Humidity: %.2f%%, Temperature: %.2f°C\n", humidity, temperature);
        // Hiển thị LCD
    lcd.setCursor(0, 0);
    lcd.print("Temp : ");
    lcd.setCursor(10, 0);
    lcd.print(String(temperature,2));
    lcd.setCursor(0, 1);
    lcd.print("Humidity : ");
    lcd.setCursor(10, 1);
    lcd.print(String(humidity,1));




    // Send data to Firebase
     String data = String("{\"temperature\": ") + String(temperature) + String(", \"humidity\": ") + String(humidity)
                  + String("}");
    
    HTTPClient http;
    http.begin(databaseURL);
    http.addHeader("Content-Type", "application/json");
    http.addHeader("Authorization", FIREBASE_AUTH);


    int httpResponseCode = http.PUT(data);

    if (httpResponseCode > 0) {
      Serial.print("Data sent successfully, response code: ");
      Serial.println(httpResponseCode);

    } 
    else {
      Serial.print("Error sending data, response code: ");
      Serial.println(httpResponseCode);
    }
           // Receive data from Firebase
      http.begin(String(databaseURL)  + "/data/Light.json");
      int httpResponse = http.GET();
      if (httpResponse > 0) {
        String response = http.getString();
        if (response == "1") {
          // Perform action when light value is 1
          // Code to turn on the LED or any other action
          digitalWrite(LED_PIN, HIGH);
        }
      }

    http.end();
  } 
  else {
    Serial.println("Failed to read from DHT sensor");
  }

  delay(1000); // Send data every 1 seconds
}