#define BLYNK_TEMPLATE_ID "TMPL6RWhSBc4f"
#define BLYNK_TEMPLATE_NAME "TestDHT11"
#define BLYNK_AUTH_TOKEN "olRuQIVBUBmU-f275fNnP78sOpMoZTOc"

#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <DHT.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);  
#define DHTpin 15
#define DHTTYPE DHT22
#define muccanhbao2 65  // Ngưỡng độ ẩm
#define muccanhbao1 28  // Ngưỡng nhiệt độ

#define buzzer 2
#define led1 4
#define led2 5

bool warningState = false;
unsigned long blinkPreviousMillis = 0; // Để theo dõi thời gian nhấp nháy LED
const long blinkInterval = 1000; // Khoảng thời gian nhấp nháy (2 giây)


#define button1_pin 26
#define button2_pin 25

#define relay1_pin 13
#define relay2_pin 12

int relay1_state = 0;
int relay2_state = 0;

#define button1_vpin    V4
#define button2_vpin    V5

BLYNK_CONNECTED() {
  Blynk.syncVirtual(button1_vpin);
  Blynk.syncVirtual(button2_vpin);
}

BLYNK_WRITE(button1_vpin) {
  relay1_state = param.asInt();
  digitalWrite(relay1_pin, relay1_state);
}

BLYNK_WRITE(button2_vpin) {
  relay2_state = param.asInt();
  digitalWrite(relay2_pin, relay2_state);
}

WidgetLED ledconnect(V0);   
WidgetLED ledwarning(V3);   
DHT dht(DHTpin, DHTTYPE);   

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

unsigned long previousMillis = 0;
const long interval = 2000;  

// Khai báo các hàm trước khi sử dụng
void listen_push_buttons();
void control_relay(int relay);

void setup() {
  Serial.begin(9600);
  dht.begin();
  lcd.init();
  lcd.backlight();
  Blynk.begin(auth, ssid, pass);
  
  pinMode(buzzer, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);

  pinMode(button1_pin, INPUT_PULLUP);
  pinMode(button2_pin, INPUT_PULLUP);
  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);

  digitalWrite(relay1_pin, LOW);
  digitalWrite(relay2_pin, LOW);
  digitalWrite(buzzer, LOW);
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);

}

void loop() {
  Blynk.run();
  listen_push_buttons();
  
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    previousMillis = currentMillis;

    float h = dht.readHumidity();
    float t = dht.readTemperature();
    float f = dht.readTemperature(true);

    if (isnan(h) || isnan(t) || isnan(f)) {
      Serial.println("ERROR: Failed to read from DHT sensor");
      return;
    }

    Blynk.virtualWrite(V1, t);
    Blynk.virtualWrite(V2, h);

    if (Blynk.connected()) {
      ledconnect.on();  
    } 
    else {
      ledconnect.off();  
    }

    if (t > muccanhbao1 || h < muccanhbao2) {
      digitalWrite(buzzer, HIGH);
      digitalWrite(led2, HIGH);
      if (!warningState) {
        warningState = true;
        ledwarning.on();  
        if( t > muccanhbao1){
        Blynk.logEvent("canh_bao", "Nhiệt độ vượt ngưỡng: " + String(t) + "°C");
        }
        if(h < muccanhbao2){
        Blynk.logEvent("canh_bao", "Độ ẩm dưới ngưỡng: " + String(h) + "%");
      }
    } 
    else {
      digitalWrite(buzzer, LOW);
      digitalWrite(led2, LOW);
      if (warningState) {
        warningState = false;
        ledwarning.off(); 
      }
    }
}
    Serial.print("DO AM : ");
    Serial.print(h);
    Serial.println("%");
    Serial.print("NHIET DO : ");
    Serial.print(t);
    Serial.print(" *C | ");
    Serial.print(f);
    Serial.println(" *F");
    
  lcd.setCursor(0, 0);
  lcd.print("DO AM:");
  lcd.setCursor(8,0);
  lcd.print(h);
  lcd.setCursor(13,0);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print(t);
  lcd.setCursor(5, 1);
  lcd.print("*C");
  lcd.setCursor(8, 1);
  lcd.print("|");
  lcd.setCursor(10, 1);
  lcd.print(f);
  lcd.setCursor(15, 1);
  lcd.print("*F");
  }
    // Xử lý nhấp nháy LED
  if (warningState && (currentMillis - blinkPreviousMillis >= blinkInterval)) {
    blinkPreviousMillis = currentMillis; // Đặt lại thời gian nhấp nháy
    
    // Chuyển đổi trạng thái đèn LED vật lý
    digitalWrite(led2, !digitalRead(led2)); 
    // Chuyển đổi trạng thái đèn LED ảo
    if (ledwarning.getValue()) {
      ledwarning.off(); // Tắt đèn LED ảo
    } else {
      ledwarning.on(); // Bật đèn LED ảo
    }
  }
}

void listen_push_buttons() {
    if(digitalRead(button1_pin) == LOW) {
      delay(200);
      control_relay(1);
      Blynk.virtualWrite(button1_vpin, relay1_state);
    } else if (digitalRead(button2_pin) == LOW) {
      delay(200);
      control_relay(2);
      Blynk.virtualWrite(button2_vpin, relay2_state);
    }
}

void control_relay(int relay) {
  if(relay == 1) {
    relay1_state = !relay1_state;
    digitalWrite(relay1_pin, relay1_state);
  } else if(relay == 2) {
    relay2_state = !relay2_state;
    digitalWrite(relay2_pin, relay2_state);
  }
  delay(50);
}