#include <Keypad.h> // the library for the 4x4 keypad
#include <LiquidCrystal_I2C.h> // the library for the i2c 1602 lcd
LiquidCrystal_I2C lcd(0x27,16,2); // lcd_Addr, lcd_cols, lcd_rows

#define Password_Length 5 // the length of the password, if the password is 4 digits long set this to 5
char Particular[Password_Length]; // the password length 
char Specific[Password_Length] = "1234"; // the password which is called specific in the code, change this to anything you want with the numbers 0-9 and the letters A-D
byte Particular_Count = 0, Specific_Count = 0; // counts the amount of digits and and checks to see if the password is correct
char Key; 
const byte ROWS = 4; // the amount of rows on the keypad
const byte COLS = 4; // the amount of columns on the keypad
char keys[ROWS][COLS] = { // sets the rowns and columns
  // sets the keypad digits
  {'1','2','3','A'}, 
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
bool SmartDoor = true; // the servo 
// the pins to plug the keypad into
byte rowPins[ROWS] = {13, 12, 11, 10};
byte colPins[COLS] = {9, 8, 7, -1};
Keypad myKeypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS); // gets the data from the keypad

// locked charcater
byte Locked[8] = { 
  B01110,
  B10001,
  B10001,
  B11111,
  B11011,
  B11011,
  B11011,
  B11111
};
// open character
byte Opened[8] = {
  B01110,
  B00001,
  B00001,
  B11111,
  B11011,
  B11011,
  B11011,
  B11111
};
const byte muxSx[4] = { 0,1,2,3 };
const byte muxSig = 6;
void setup()
{
  lcd.init(); // initializes the lcd 
  lcd.backlight(); // turns on the backlight
  pinMode(muxSx[0], OUTPUT);
  pinMode(muxSx[1], OUTPUT);
  pinMode(muxSx[2], OUTPUT);
  pinMode(muxSx[3], OUTPUT);
  pinMode(muxSig, INPUT);
}

void loop()
{
  static byte emptyBox = 0;
  static byte blinkLed = 2;
  if (SmartDoor == 0) // opens the smart door
  {
    Key = myKeypad.getKey(); // the word key = myKeypad which gets the value

    if (Key == '#') // when the '#' key is pressed

    {
      lcd.clear(); // clears the lcd diplay
      lcd.setCursor(2,0); // sets the cursor on the lcd
      lcd.print("Door Closed"); // prints the text to the lcd
      lcd.createChar(0, Locked); // prints the locked character 
      lcd.setCursor(14,0); // sets the cursor on the lcd
      lcd.write(0); // prints the first character when you are on the door closed page
      delay(3000); // waits 3 seconds
      SmartDoor = 1; // closes the door
    }
  }

  else Open(); // keeps the door open

  byte switch1 = 3 + (emptyBox * 3);
  pinMode(muxSig, INPUT);
  PORTD = switch1;
  delay(10);
  if (digitalRead(muxSig)) {
    PORTD = ++switch1;
    delay(10);
    if (digitalRead(muxSig)) {
      PORTD = blinkLed + (emptyBox * 3);
      digitalWrite(muxSig, HIGH);
      emptyBox++;
    }
  }
  if (emptyBox > 3) emptyBox = 0;
}

void clearData() // clears the data
{
  while (Particular_Count != 0) // counts the digits pressed
  {
    Particular[Particular_Count--] = 0; // counts how many digits
  }
  return; // returns the data
}

void Open() // function declarations
{
  lcd.setCursor(1,0); // sets the cursor on the lcd
  lcd.print("Enter Password:"); // prints the text
  
  Key = myKeypad.getKey(); // gets the keys you press from the keypad
  if (Key)
  {
    Particular[Particular_Count] = Key; 
    lcd.setCursor(Particular_Count, 1); // sets the cursor on the lcd
    lcd.print("*"); // prints '*' instead of the password
    Particular_Count++; // counts the length of the password
  }

  if (Particular_Count == Password_Length - 1) // gets the length of the password 
  {
    if (!strcmp(Particular, Specific)) // counts the length and checks to see if the password is correct
    {
      lcd.clear();
      lcd.setCursor(2,0); // sets the cursor on the lcd
      lcd.print("Door Opened");
      lcd.createChar(1, Opened);
      lcd.setCursor(14,0); // sets the cursor on the lcd
      lcd.write(1);
      lcd.setCursor(0,1); // sets the cursor on the lcd
      lcd.print("Press # to Close");
      SmartDoor = 0;
    }
    else
    {
      lcd.clear();
      lcd.setCursor(0,0); // sets the cursor on the lcd
      lcd.print("Wrong Password"); // prints the text/character
      SmartDoor = 1; // closes the smart door
    }
    clearData(); // clears the data
  }
}