#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <Keypad.h>
#include <ESP32Servo.h>

#define BLYNK_TEMPLATE_ID "TMPL3gQuGFaeN"
#define BLYNK_TEMPLATE_NAME "lock"
#define BLYNK_AUTH_TOKEN "qA0a6XMMTnM4A3Pi29Rh3k09ZCAwLEeJ"


char auth[] = "qA0a6XMMTnM4A3Pi29Rh3k09ZCAwLEeJ";  // Replace with your Blynk auth token
char ssid[] = "";    // Replace with your WiFi name
char pass[] = ""; // Replace with your WiFi password

// Keypad Configuration
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 Motor
Servo lockServo;
const int servoPin = 4;
const int LOCK_POS = 90;  // Locked position
const int UNLOCK_POS = 0; // Unlocked position

// PIN Code Configuration
String correctPIN = "1234";
String enteredPIN = "";
bool isUnlocked = false;
unsigned long unlockTime = 0;
const unsigned long LOCK_DELAY = 5000;  // Auto-lock after 5 seconds

void setup() {
    Serial.begin(115200);
    Blynk.begin(auth, ssid, pass); // Connect to Blynk

    lockServo.attach(servoPin, 500, 2500);  // Servo PWM range
    lockServo.write(LOCK_POS);  // Start locked
    Serial.println("🔒 System Locked.");
}

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

// Keypad Unlock
void checkPIN() {
    if (enteredPIN == correctPIN) {
        Serial.println("\n✅ Correct PIN! Unlocking...");
        lockServo.write(UNLOCK_POS);
        Serial.println("🔄 Servo moved to: UNLOCK_POS");
        Blynk.notify("🔓 Lock Opened!");  // Blynk notification
        isUnlocked = true;
        unlockTime = millis();
    } else {
        Serial.println("\n❌ Incorrect PIN!");
    }
    enteredPIN = "";
}

// Reset PIN Entry
void resetPIN() {
    enteredPIN = "";
    Serial.println("\nPIN Reset");
}

// Auto-Lock after Delay
void autoLock() {
    Serial.println("Auto-locking...");
    lockServo.write(LOCK_POS);
    Blynk.virtualWrite(V0, 0);  // Update Blynk switch
    isUnlocked = false;
}

// Blynk App Control (Virtual Pin V0)
BLYNK_WRITE(V0) {
    int lockState = param.asInt();
    if (lockState == 1) {
        lockServo.write(UNLOCK_POS);
        Serial.println("🔓 Unlocked via Blynk");
        Blynk.notify("🔓 Lock Opened!");
        isUnlocked = true;
        unlockTime = millis();
    } else {
        autoLock();
    }
}