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

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
const byte Rows = 4;
const byte Cols = 3;

char keys[Rows][Cols] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

byte rowPins[Rows] = {8, 7, 6, 5};
byte colPins[Cols] = {4, 3, 2};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, Rows, Cols);

const char* keyList[] = {"3211"}; //, "6316", "5834", "1179", "2563", "7375", "2962", "1195", "8246", "2516", "8490", "7259", "1273", "3382", "4276"};

void setup() {
  lcd.begin(16, 2);
  erase();
  start();
}

int keyCol = 10;

void loop() {
  char keyInsert[5] = {0};

  while (strlen(keyInsert) < 4) {
    char key = keypad.getKey();
    if (key) {
      lcd.setCursor(keyCol, 1);
      lcd.write('*');
      ++keyCol;
      keyInsert[strlen(keyInsert)] = key;
    }
  }

  if (verifyKey(keyInsert)) {
    delay(350);
    erase();
    lcd.setCursor(4,0);
    lcd.write("ACCESO");
    lcd.setCursor(3,1);
    lcd.write("CONCEDIDO");
    delay(2500); erase();
    lcd.setCursor(0,1);
    lcd.print("¡Bienvenido/a!");
  } 
  else {
    delay(350);
    erase();
    lcd.setCursor(5,0);
    lcd.write("ACCESO");
    lcd.setCursor(4,1);
    lcd.write("DENEGADO");
    delay(2500); erase();
    lcd.write("Clave");
    lcd.setCursor(0,1);
    lcd.write("Incorrecta");
    delay(1900); erase();
    lcd.write("Por favor");
    lcd.setCursor(0,1);
    lcd.write("intente de nuevo");
  }
  delay(3000);
  erase();
  start();
}

bool verifyKey(const char* keyIn) {
  for (const auto& keyOk : keyList) {
    if (strcmp(keyIn, keyOk) == 0) {
      return true;
    }
  }
  return false;
}

void erase() {
  lcd.clear();
  if(keyCol > 10){ 
    keyCol = 10;
  }
}

void start() {
  lcd.setCursor(0,0);
  lcd.write("INSERTE");
  lcd.setCursor(1,1);
  lcd.write("CLAVE");
  lcd.setCursor(9,1);
  lcd.print("{____}");
}