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

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] = {A0, A1, A2, A3};
byte colPins[COLS] = {8, 7, 6, 5};

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

Servo servo;
const int servoPin = 9;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const String correctPasscode = "1222";
int intentosPosibles = 0;
String enteredPasscode = "";

void setup() {
  Serial.begin(9600);
  servo.attach(servoPin);
  servo.write(0);
  lcd.begin(16, 2);
  lcd.print("Enter Passcode:");
}

void loop() {
  char key = keypad.getKey();
  if (intentosPosibles >= 3) {
    lcd.clear();
    lcd.print("Demasiados intentos!");
    delay(12000);
    lcd.clear();
    intentosPosibles = 0;
    lcd.print("Enter Passcode:");
    return;
  }

  if (key) {
    if (key == '#') {
      if (enteredPasscode == correctPasscode) {
        unlockDoor();
      } else {
        lcd.clear();
        lcd.print("Incorrect Passcode!");
        intentosPosibles++;
        delay(2000);
        lcd.clear();
        lcd.print("Enter Passcode");
      }
      enteredPasscode = "";
    } else {
      enteredPasscode += key;
      lcd.setCursor(0, 1);
      lcd.print("                ");
      lcd.setCursor(0, 1);
      lcd.print(enteredPasscode);
    }
  }
}

void unlockDoor() {
  lcd.clear();
  lcd.print("Door Unlocked");
  servo.write(90);
  delay(12000);
  servo.write(0);
  delay(1000);
  lcd.clear();
  lcd.print("Enter Passcode");
}