/*
  Forum: https://forum.arduino.cc/t/lcd-and-led-wont-work-together/1232311
  Wokwi: https://wokwi.com/projects/391629716735284225

*/

int buttonState = 0;
#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Key.h>

LiquidCrystal lcd(13, 12, 5, 4, 3, 2);

const byte ledPin = 9;
const byte switchPin = 7;


const byte ROWS = 4;
const byte COLS = 4;
int lcdRow = 0;
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 colsPins[COLS] = {A4, A5, 11, 10};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colsPins, ROWS, COLS);
String password;


void setup()
{
  pinMode(switchPin, INPUT);
  pinMode(ledPin, OUTPUT);
  /// pinMode(2, OUTPUT); ???????????????????
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.print("Enter Password: ");
  delay(1000);
  lcd.clear();
}

void loop()
{
  if (enabled()) {
    CheckPwd();
    digitalWrite(ledPin,HIGH);
  } else {
    digitalWrite(ledPin,LOW);
  }
}

boolean enabled() {
  return (!digitalRead(switchPin));
}

void CheckPwd(){
  char key = keypad.getKey();
  if (key) {
    lcd.print(key);
    password = password + key;
    if (key == 'A') {
      clearPrintWaitDelete("Checking PWD",0, false);
      lcd.setCursor(0, 1);
      lcd.print(password);
      delay(1000);
      if (password == "111A") {
        clearPrintWaitDelete("Accepted",1000, true);
      }
      else {
        clearPrintWaitDelete("Denied",1000, true);
      }
    }
    if (key == 'C') {
      clearPrintWaitDelete("Clearing...",1000, true);
    }
  }
}

void clearPrintWaitDelete(String msg, unsigned long waitTime, boolean delPwd) {
  lcd.clear();
  lcd.print(msg);
  delay(waitTime);
  if (delPwd) {
    lcd.clear();
    password = "";
  }
}