#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#define ROW_NUM     4 // four rows
#define COLUMN_NUM  4 // four columns

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27 (from DIYables LCD), 16 column and 2 rows


char keys[ROW_NUM][COLUMN_NUM] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte pin_rows[ROW_NUM]      = {23,25,27,29}; // GPIO19, GPIO18, GPIO5, GPIO17 connect to the row pins
byte pin_column[COLUMN_NUM] = {31,33,35,37};   // GPIO16, GPIO4, GPIO0, GPIO2 connect to the column pins
String input_password;
Keypad keypad = Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
int cursorColumn = 3;
int button1=39;
int button2=41;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  // lcd.setCursor(1,0);
  // lcd.print("Hello");
  Serial.println("Hello, ESP32!");
  pinMode(button1, INPUT_PULLUP);
  pinMode(button2, INPUT_PULLUP);
  pinMode(52, OUTPUT);
  input_password.reserve(32); // maximum input characters is 33, change if needed
    digitalWrite(52, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
  int buttonVal1 = digitalRead(button1);
  int buttonVal2 = digitalRead(button2);
  char key = keypad.getKey();
  lcd.setCursor(2, 0);
    lcd.print("Enter Passcode");
  if (key) {
    lcd.setCursor(cursorColumn, 1); // move cursor to   (cursorColumn, 0)
    // lcd.blink();k
    lcd.print("*");                 // print key at (cursorColumn, 0)
    Serial.print(key);
    if (cursorColumn == 16) {       // if reaching limit, clear LCD
      lcd.clear();
      cursorColumn = 0;
    }
    input_password += key;
    cursorColumn++;
  }
  if(cursorColumn>=8){
     if(input_password=="CDAB"){
      Serial.println("\nPin Matched");
    input_password="";
    lcd.clear();
    lcd.setCursor(3,1);
    lcd.setCursor(4,3);
    lcd.println("Pin Matched");
      cursorColumn = 4;
    digitalWrite(52, HIGH);
  }
  else {
      Serial.println("\nPin Doesn't match");
      input_password="";
      lcd.clear();
      // lcd.setCursor(3,1);
      cursorColumn = 3;
      lcd.setCursor(1,3);
      lcd.println("Pin Does not Match");
    digitalWrite(52, LOW);

    }
  }
  if(buttonVal1==0){
    input_password="";
    Serial.println("Password Cleared");
    lcd.clear();
    lcd.setCursor(0,1);
      cursorColumn = 4;
    digitalWrite(52, LOW);

  }
  if(buttonVal2==0){
   if(input_password!=""){
     if(input_password=="CDAB"){
      Serial.println("\nPin Matched");
    input_password="";
    lcd.clear();
    lcd.setCursor(3,1);
    lcd.setCursor(4,3);
    lcd.println("Pin Matched");
      cursorColumn = 4;
    digitalWrite(52, HIGH);
    } else {
      Serial.println("\nPin Doesn't match");
      input_password="";
      lcd.clear();
      // lcd.setCursor(3,1);
      cursorColumn = 3;
      lcd.setCursor(1,3);
      lcd.println("Pin Does not Match");
    digitalWrite(52, LOW);

    }

   }
       Serial.print(input_password);
  }
  // Serial.println(sensorVal);
  delay(10); // this speeds up the simulation
}