#define BLYNK_TEMPLATE_ID "TMPL6w7AkRX21"
#define BLYNK_TEMPLATE_NAME "Smart Weather Station"
#define BLYNK_AUTH_TOKEN "jT1gqDJjheE-RcMOHMXoyefO6bZxB0xv"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// ===== DHT CONFIG =====
#define DHTPIN 4
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

// ===== TIMER =====
BlynkTimer timer;

// ===== AIR QUALITY =====
String getAirQuality(int co2) {
  if (co2 < 800) return "Good";
  else if (co2 <= 1200) return "Moderate";
  else return "Poor";
}

// ===== SEND SENSOR =====
void sendSensor() {
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();

  if (isnan(temp) || isnan(hum)) {
    Serial.println("DHT error");
    return;
  }

  // ===== FAKE CO2 =====
  int co2 = random(600, 1500);

  String status = getAirQuality(co2);

  // ===== SEND TO BLYNK =====
  Blynk.virtualWrite(V0, temp);
  Blynk.virtualWrite(V1, hum);
  Blynk.virtualWrite(V2, co2);
  Blynk.virtualWrite(V3, status);

  Serial.print("Temp: "); Serial.print(temp);
  Serial.print(" | Hum: "); Serial.print(hum);
  Serial.print(" | CO2: "); Serial.print(co2);
  Serial.print(" | "); Serial.println(status);
}

void setup() {
  Serial.begin(115200);

  dht.begin();

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  timer.setInterval(2000L, sendSensor); // mỗi 2 giây
}

void loop() {
  Blynk.run();
  timer.run();
}