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

// ===== Pins =====
#define PIR 4
#define BUZZER 18
#define LED 19

// ===== LCD =====
LiquidCrystal_I2C lcd(0x27, 16, 2);

// ===== WiFi (Simulation) =====
const char* ssid = "Wokwi-GUEST";

// ===== Keypad Setup =====
const byte ROWS = 4;
const byte COLS = 4;

char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[ROWS] = {13, 12, 14, 27};
byte colPins[COLS] = {26, 25, 33, 32};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// ===== Password =====
String password = "1234";
String input = "";

// ===== Setup =====
void setup() {
  pinMode(PIR, INPUT);
  pinMode(BUZZER, OUTPUT);
  pinMode(LED, OUTPUT);

  Serial.begin(115200);

  lcd.init();
  lcd.backlight();

  lcd.print("System Ready");

  // WiFi (simulation)
  WiFi.begin(ssid);
  Serial.print("Connecting WiFi...");
}

// ===== Loop =====
void loop() {

  int motion = digitalRead(PIR);

  if (motion == HIGH) {

    lcd.clear();
    lcd.print("Motion Detected!");
    delay(1000);

    lcd.clear();
    lcd.print("Enter Password:");

    input = "";
    unsigned long startTime = millis();

    // ===== 10 seconds to enter password =====
    while (millis() - startTime < 10000) {

      char key = keypad.getKey();

      if (key) {
        input += key;
        lcd.setCursor(0, 1);
        lcd.print(input);
      }

      // ✅ Correct Password
      if (input == password) {
        lcd.clear();
        lcd.print("Access Granted");

        digitalWrite(BUZZER, LOW);
        digitalWrite(LED, LOW);

        delay(2000);
        return;
      }
    }

    // ❌ Wrong Password → Alarm
    lcd.clear();
    lcd.print("ALERT!!!");

    digitalWrite(BUZZER, HIGH);
    digitalWrite(LED, HIGH);

    Serial.println("🚨 Motion Detected!");
    Serial.println("📲 Sending WiFi Alert...");

    delay(5000);
  }
}