#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define BLYNK_PRINT Serial
#define BLYNK_USE_DIRECT_CONNECT

#include <BlynkSimpleEsp32_BT_WF.h>
#include <BTAddress.h>
#include <BTAdvertisedDevice.h>
#include <BTScan.h>

#define MQ2_ANA 1
#define MQ2_DIG 2

#define THRESHOLD 400
#define BUZZER_PIN 12

#define LED_PIN 5

#define LCD_COLUMNS 16
#define LCD_ROWS 2
#define LCD_ADDRESS 0x27

#define SDA_PIN 4
#define SCL_PIN 3

char auth[] = "4idLXCFezGWkNfgWz_XL946AH2tv8eHX";

// Your WiFi credentials.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define WIFI_SSID        "SSID"
#define WIFI_PASS        "PASSWORD"

#define WIFI_SSID1       "SSID1"
#define WIFI_PASS1       "PASSWORD1"

#define BLYNK_AUTH_BLE   "BLE_Auth_Token"

#define USE_BLYNK_WM      true

#define PIN_D22   22            // Pin D22 mapped to pin GPIO22/SCL of ESP32

#define DHT_PIN     PIN_D22     // pin DATA @ D22 / GPIO22
#define DHT_TYPE    DHT11

LiquidCrystal_I2C lcd(LCD_ADDRESS, LCD_COLUMNS, LCD_ROWS);

BlynkTimer timer;

int readMQ2() {
  int rawValue = analogRead(MQ2_ANA);
  return map(rawValue, 0, 8191, 0, 1023);
}

void setupLCD() {
  Wire.begin(SDA_PIN, SCL_PIN);
  delay(100);  // Breve retraso para estabilización
  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void setupPins() {
  pinMode(MQ2_ANA, INPUT);
  pinMode(MQ2_DIG, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
}

void printGasLevel(int value) {
  lcd.setCursor(0, 0);
  lcd.print("Nivel GAS: ");
  lcd.setCursor(11, 0);
  
  // Limpiar los últimos 5 caracteres de la línea
  lcd.print("     ");
  
  // Posicionar el cursor para alinear a la derecha
  int startPos = value < 10 ? 15 : (value < 100 ? 14 : (value < 1000 ? 13 : 12));
  lcd.setCursor(startPos, 0);
  lcd.print(value);

  // Imprimir el estado en la segunda línea
  lcd.setCursor(0, 1);
  if (value > THRESHOLD) {
    lcd.print("Advertencia     ");
  } else {
    lcd.print("Normal          ");
  }
}

void handleAlarm(int gasLevel) {
  bool isAlarmOn = gasLevel > THRESHOLD;
  digitalWrite(BUZZER_PIN, isAlarmOn);
  digitalWrite(LED_PIN, isAlarmOn);
}

void remoteUpdate() {
  int gasLevel = readMQ2();
  Blynk.virtualWrite(V0, gasLevel);  // Asumiendo que V0 es el pin virtual "Gas" en Blynk
  
  printGasLevel(gasLevel);
  handleAlarm(gasLevel);
  
  Serial.print("Gas Level: ");
  Serial.println(gasLevel);
}

void setup() {
  Serial.begin(115200);
  setupLCD();
  setupPins();
  
  if (USE_BLYNK_WM) {
    Blynk.setConfigPortalIP(IPAddress(192, 168, 100, 1));
    Blynk.setConfigPortal("ESP32-BLE-WF", "ESP32_BLE_WF");
    Blynk.begin(BLYNK_AUTH_BLE);
  } else {
    Blynk.setDeviceName("ESP32-BLE-WF");
    Blynk.begin(auth, ssid, pass);
  }
  
  // Configurar el timer para llamar a remoteUpdate cada 1 segundo
  timer.setInterval(1000L, remoteUpdate);
}

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

BLYNK_CONNECTED() {
  // Tu código aquí (si es necesario)
}