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

DHT dht(4, DHT11);
float temperature;
float humidity;

const char *MQTTServer = "broker.hivemq.com";
const char *MQTT_Topic = "hknhan/nhietdo";
const char *MQTT_Output_Topic = "hknhan/ledStatus";
const char *MQTT_ID = "emnhandepzai";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 12;

void WIFIConnect() {
  Serial.println("Connecting to SSID: nhan");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.println(" connected");
      client.subscribe(MQTT_Topic); 
      client.subscribe(MQTT_Output_Topic); 
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  // Kết nối đến mạng WiFi
  WIFIConnect();
  
  // Gửi yêu cầu HTTP GET để lấy trạng thái đèn
  HTTPClient http;
  String url = "http://66yhqrma3f.sharedwithexpose.com/aaaa/data.php?fetchLedStatus=true";
  http.begin(url);
  int httpCode = http.GET();
  
  if (httpCode > 0) {
    if (httpCode == HTTP_CODE_OK) {
      String payload = http.getString();
      if (payload.equals("1")) { 
        digitalWrite(ledPin, HIGH);
        Serial.println("LED status: " + payload);
      } else {
        Serial.println("Failed to get LED status, HTTP error code: " + String(httpCode));
      }
    } else {
      Serial.println("Failed to connect to server");
    }
  }
  http.end();
  
  // Kết nối MQTT
  client.setServer(MQTTServer, Port);
  MQTT_Reconnect();
}

void loop() {
  temperature = dht.readTemperature();
  humidity = dht.readHumidity();

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

  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();

  String payload = "{\"temperature\": " + String(temperature) + ", \"humidity\": " + String(humidity) + "}";
  client.publish(MQTT_Topic, payload.c_str());

  delay(10000);
}