#define BLYNK_TEMPLATE_ID "TMPL6WYwryJUp"
#define BLYNK_TEMPLATE_NAME "anti burglary system"
#define BLYNK_AUTH_TOKEN "SPSObfFekQyaFtmvtaydA5dbZgTD0KKj"

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <BlynkSimpleEsp32.h>

const int trigPin = 23;
const int echoPin = 19;
const int buzzerPin = 18;
const int ledPin = 5;
const int buttonPin = V1; // Virtual pin for Blynk button

LiquidCrystal_I2C lcd(0x27, 16, 2);

bool alarmActive = false;
unsigned long lastDebounceTime = 0;
const unsigned long debounceDelay = 50;

char auth[] = "SPSObfFekQyaFtmvtaydA5dbZgTD0KKj";
char ssid[] = "SiberZon@PNM";
char pass[] = "";

BLYNK_WRITE(buttonPin) {
  int buttonState = param.asInt();
  if (buttonState == 1 && alarmActive) {
    alarmActive = false;
    noTone(buzzerPin);
    digitalWrite(ledPin, LOW);
    lcd.clear();
    lcd.print("ALARM OFF,");
    lcd.setCursor(0, 1);
    lcd.print("ENGAGING...");
    delay(4000);
    lcd.clear();
    lcd.print("ALARM ON, KEEP");
    lcd.setCursor(0, 1);
    lcd.print("YOUR DISTANCE!");
  }
}

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);

  lcd.init();
  lcd.backlight();
  lcd.print("ALARM ON, KEEP");
  lcd.setCursor(0, 1);
  lcd.print("YOUR DISTANCE!");

  WiFi.begin(ssid, pass);
  Blynk.begin(auth, ssid, pass);
}

long calculateDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  long distance = (duration * 0.034) / 2;
  return distance;
}

void loop() {
  Blynk.run();

  long distance = calculateDistance();

  if (distance < 100 && !alarmActive) {
    alarmActive = true;
    lcd.clear();
    lcd.print("INTRUDER ALERT!");
    lcd.setCursor(0, 1);
    lcd.print("ALERT ALERT!");
  }

  if (alarmActive) {
    tone(buzzerPin, 2000);
    digitalWrite(ledPin, HIGH);
    delay(250);
    noTone(buzzerPin);
    digitalWrite(ledPin, LOW);
    delay(250);
  }
}