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


const int keypadRows = 4;
const int keypadColumns = 4;
const byte rowPins[keypadRows] = {9, 8, 7, 6};
const byte colPins[keypadColumns] = {5, 4, 3, 2};

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

Keypad keypad = Keypad(makeKeymap((char*)keys), rowPins, colPins, keypadRows, keypadColumns);


LiquidCrystal_I2C lcd(0x27, 20, 4);


Servo front; 
Servo back;  
int servoPinFront = 11;  
int servoPinBack = 10; 
int servoUnlockPos = 0;
int servoLockPos = 90;


const int trigPin = 12; 
const int echoPin = 13;  


String password = "1234";
String input = "";


int attempts = 5;
bool lockoutMode = false;

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

  lcd.begin(20, 4);
  lcd.init();
  lcd.setCursor(0, 0);
  lcd.backlight();
  showMessage();

  front.attach(servoPinFront);
  back.attach(servoPinBack);
  front.write(servoLockPos);  
  back.write(servoLockPos);  

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
}

void showMessage() {
  lcd.setCursor(4, 0);
  lcd.print("WELCOME");
  delay(1000);

  lcd.setCursor(0, 2);
  String message = "HOME SECURITY SYSTEM";
  for (int i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }
  delay(500);
}

int readDistance() {
  int distance;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  distance = pulseIn(echoPin, HIGH) * 0.034 / 2;
  return distance;
}

String inputPassword() {
  String input = "";
  lcd.setCursor(0, 0);
  lcd.print("Enter password");
  lcd.setCursor(0, 1);
  lcd.print("Attempts: " + String(attempts));
  lcd.setCursor(0, 2);
  lcd.print("----");

  while (input.length() < 4) {
    char key = keypad.getKey();
    if (key) { 
      if (key >= '0' && key <= '9') {
        lcd.setCursor(input.length(), 2);
        lcd.print('*');
        input += key;
        Serial.print(key);
        Serial.println();
      } else if (key == '#') {
        input = ""; 
        lcd.setCursor(0, 2);
        lcd.print("----");
      }
    }
  }
  return input;
}

void loop() {
  if (lockoutMode) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("TOO MANY ATTEMPTS!");
    delay(1000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("WAIT FOR 15 SECONDS");
    delay(1000);
    for (int i = 15; i > 0; i--) {
      lcd.setCursor(0, 1);
      lcd.print("TIME REMAINING: " + String(i) + " SECONDS");
      delay(1000);
    }
    lockoutMode = false;
    attempts = 5; 
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("CALL 0707350937");
    delay(2000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter password");
    lcd.setCursor(0, 1);
    lcd.print("Attempts: " + String(attempts));
    lcd.setCursor(0, 2);
    lcd.print("----");
  }

  int distance = readDistance();
  if (distance <= 15) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Front door: " + String(distance) + "cm");
    delay(2000);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter password");
    lcd.setCursor(0, 1);
    lcd.print("Attempts: " + String(attempts));
    lcd.setCursor(0, 2);
    lcd.print("----");

    input = inputPassword();

    if (input == password) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Unlocked!");
      front.write(servoUnlockPos); 
      delay(1000);
      front.write(servoLockPos); 
    } else {
      attempts--; 
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Incorrect password!");
      lcd.setCursor(0, 1);
      lcd.print("Attempts: " + String(attempts));
      lcd.setCursor(0, 2);
      lcd.print("----");
      delay(2000);
      if (attempts == 0) {
        lockoutMode = true;
      }
    }
  }
}