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

const int PIRPin = 2;
const int ultrasonicDistanceSensorTrig_Pin = 13;
const int ultrasonicDistanceSensorEcho_Pin = 12;
const int keypadPin = 4;
const int lcdDisplayPin = 5;
const int Green_LEDPin = 27;
const int Red_LEDPin = 26;

String Username = "221234516"; // password
String UserInput = "";
int incorrectAttempts = 0; // Counter for incorrect attempts

LiquidCrystal_I2C lcdDisplay(0x27, 16, 2);

// Define keypad layout
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] = {22, 23, 24, 25};
byte colPins[COLS] = {26, 27, 28, 29};

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

void setup() {
  Serial.begin(9600);

  pinMode(PIRPin, INPUT);
  pinMode(ultrasonicDistanceSensorEcho_Pin, INPUT);
  pinMode(ultrasonicDistanceSensorTrig_Pin, OUTPUT);
  pinMode(keypadPin, INPUT);
  pinMode(lcdDisplayPin, OUTPUT);
  pinMode(Green_LEDPin, OUTPUT);
  pinMode(Red_LEDPin, OUTPUT);

  lcdDisplay.init();
  lcdDisplay.backlight();
  lcdDisplay.clear();
  lcdDisplay.setCursor(0, 0);
  lcdDisplay.print("Enter Username");
}

void loop() {
  int humanPresence = digitalRead(PIRPin);
  int vehiclePresence = digitalRead(ultrasonicDistanceSensorEcho_Pin);

  if (vehiclePresence == HIGH) {
    Serial.println("Vehicle Detected");
  }

  if (humanPresence == HIGH) {
    String enteredUsername = "";
    char key;
    do {
      key = keypad.getKey();
      if (key) {
        enteredUsername += key;
        lcdDisplay.print(key);
      }
    } while (key && enteredUsername.length() < Username.length());

    if (enteredUsername == Username) {
      accessGranted();
      incorrectAttempts = 0; // Reset incorrect attempt counter
    } else {
      accessDenied();
      incorrectAttempts++; // Increment incorrect attempt counter
      if (incorrectAttempts >= 3) { // Check if three or more incorrect attempts
        alarmTriggered();
        incorrectAttempts = 0; // Reset incorrect attempt counter
      }
    }
  } else {
    accessDenied();
  }

  if (vehiclePresence == HIGH) {
    digitalWrite(Red_LEDPin, HIGH);
    delay(1000);
    digitalWrite(Red_LEDPin, LOW);
  }

  delay(1000);
}

void accessGranted() {
  lcdDisplay.clear();
  lcdDisplay.setCursor(0, 0);
  lcdDisplay.print("Access: Granted");
  digitalWrite(Green_LEDPin, HIGH);
  delay(1000);
  digitalWrite(Green_LEDPin, LOW);
}

void accessDenied() {
  lcdDisplay.clear();
  lcdDisplay.setCursor(0, 0);
  lcdDisplay.print("Access: Denied");
  digitalWrite(Red_LEDPin, HIGH);
  delay(1000);
  digitalWrite(Red_LEDPin, LOW);
}

void alarmTriggered() {
  Serial.println("Alert: Maximum incorrect attempts reached!");
  for (int i = 0; i < 3; i++) { // Blink the red LED 3 times
    digitalWrite(Red_LEDPin, HIGH);
    delay(500);
    digitalWrite(Red_LEDPin, LOW);
    delay(500);
  }
}