#include <ArduinoIoTCloud.h>
#include <Arduino_ConnectionHandler.h>
#include <Keypad.h>
#include <ESP32Servo.h>
// Wi-Fi Credentials
const char SSID[] = "YOUR_WIFI_SSID";
const char PASS[] = "YOUR_WIFI_PASSWORD";
// Arduino IoT Cloud Credentials
const char DEVICE_ID[] = " de2e8e0a-1b18-4b6e-b82c-f2631f01f0dd";
const char SECRET_KEY[] = " e7#uu3xT3tL!1#NUKBA?WnR0J";  // Added Secret Key
WiFiConnectionHandler ArduinoIoTCloud(SSID, PASS);
// Keypad setup
const byte ROWS = 4, COLS = 4;
char keys[ROWS][COLS] = {
    {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
    {'7', '8', '9', 'C'},
    {'*', '0', '#', 'D'}};
byte rowPins[ROWS] = {25, 26, 27, 14};  
byte colPins[COLS] = {32, 33, 12, 13};  
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
// Servo Setup
Servo lockServo;  
const int servoPin = 4;
const int LOCK_POS = 90;
const int UNLOCK_POS = 0;
// Lock System Variables
String correctPIN = "2042";
String enteredPIN = "";
bool isUnlocked = false;
unsigned long unlockTime = 0;
const unsigned long LOCK_DELAY = 5000;
// Cloud variable
bool lockState = false;
void onLockStateChange() {
    if (lockState) {
        lockServo.write(UNLOCK_POS);
        Serial.println("🔓 Unlocked from Cloud!");
    } else {
        lockServo.write(LOCK_POS);
        Serial.println("🔒 Locked from Cloud!");
    }
}
void setup() {
    Serial.begin(115200);
    lockServo.attach(servoPin, 500, 2500);
    lockServo.write(LOCK_POS);
    Serial.println("🔒 System Locked.");
    
    // Connect to Arduino IoT Cloud
    ArduinoCloud.begin(SSID, PASS);
    setDebugMessageLevel(2);
    ArduinoCloud.addProperty(lockState, READWRITE, ON_CHANGE, onLockStateChange);
}
void loop() {
    ArduinoCloud.update(); // Keep Cloud connection active
    char key = keypad.getKey();
    if (key) {
        Serial.print(key);
        if (key == '#') checkPIN(); 
        else if (key == '*') resetPIN();
        else enteredPIN += key;
    }
    if (isUnlocked && millis() - unlockTime > LOCK_DELAY) autoLock();
}
void checkPIN() {
    if (enteredPIN == correctPIN) {
        Serial.println("\n✅ Correct PIN! Unlocking...");
        lockServo.write(UNLOCK_POS);
        lockState = true; // Sync with Cloud
        isUnlocked = true;
        unlockTime = millis();
    } else {
        Serial.println("\n❌ Incorrect PIN!");
    }
    enteredPIN = "";
}
void resetPIN() {
    enteredPIN = "";
    Serial.println("\nPIN Reset");
}
void autoLock() {
    Serial.println("🔒 Auto-locking...");
    lockServo.write(LOCK_POS);
    lockState = false; // Sync with Cloud
    isUnlocked = false;
}