/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-keypad-lcd
 */

#include <Keypad.h>
#include <LiquidCrystal_I2C.h>

#define ROW_NUM     4 // four rows
#define COLUMN_NUM  4 // four columns

char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};

uint8_t pin_rows[ROW_NUM]      = {12, 14, 27, 26}; // GPIO19, GPIO18, GPIO5, GPIO17 connect to the row pins
uint8_t pin_column[COLUMN_NUM] = {25, 33, 32, 13};   // GPIO16, GPIO4, GPIO0, GPIO2 connect to the column pins

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

int cursorColumn = 0;
int i=0;
String KeyCode = "";
String myCode = "12345";
int dlugoschasla = 5;
char reset = '*';
char enter = '#';

void clearLCDLine(int line){
for(int n = 0; n < 16; n++) { // 20 indicates symbols in line. For 2x16 LCD write - 16
lcd.setCursor(n,line);
lcd.print("");
}
lcd.setCursor(0,line); // set cursor in the beginning of deleted line
}



void enteronpassword(){
  char key = keypad.getKey();
  if(KeyCode==myCode)
            { 

               clearLCDLine(1);
               lcd.setCursor(0,1);
               lcd.print("Udzielam dostepu");
               cursorColumn=0;
               digitalWrite(19,LOW);
               digitalWrite(18,HIGH);
               delay(3000);
               digitalWrite(18,LOW);
               KeyCode="";
               setup();
           }
      else
          {
               clearLCDLine(1);
               lcd.setCursor(0,1);
               lcd.print("Brak dostepu");
               cursorColumn=0;
               delay(1000);
               KeyCode="";
               setup();
           }

}


void setup(){
  Serial.begin(115200);
  lcd.init(); // initialize the lcd
  lcd.backlight();
  lcd.clear();
  KeyCode="";
  cursorColumn=0;
  pinMode(18, OUTPUT);
  pinMode(19, OUTPUT);
  digitalWrite(19,HIGH);
  lcd.setCursor(cursorColumn,0);
  lcd.print("RFID lub kod");
  cursorColumn=0;
}

void loop(){
  char key = keypad.getKey();
  digitalWrite(19,HIGH);
  if(key && key==reset)
    {
       setup();
    }
    if(key && key==enter)
    {
      enteronpassword();
    }

    else if(key && cursorColumn<15)
    {
      if (key != reset && key != enter)
      {
    lcd.setCursor(cursorColumn, 1); // move cursor to   (cursorColumn, 0)
    lcd.print("*");                 // print key at (cursorColumn, 0)
    cursorColumn++;                // move cursor to next position
    KeyCode = KeyCode + String(key);
      }
    }
    else if(key && cursorColumn == 15)
    {
      setup();
    }

  }