/*
  Forum: https://forum.arduino.cc/t/the-lcd-screen-doesnt-show-the-input-from-the-keypad/1232826
  Wokwi: https://wokwi.com/projects/391735173918223361

*/

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

// RS, E, D4 ..D7
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns

char timeobj;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {7, 6, 5, 4}; 
byte colPins[COLS] = {3, 2, A4, A5}; 

int codiceSegreto = 0;
int tempoTimer = 0;
bool codiceInserito = false;
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void setup() {
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.print("Inserisci codice:");
}

void loop() {
  char key = keypad.getKey();

  if (!codiceInserito) {
    inserisciCodice(key);
  } else {
    gestisciTimer(key);
  }
}



void inserisciCodice(char key) {
  static String inputCode = "";

  if (key != NO_KEY) {
    if (key >= '0' && key <= '9') {
      inputCode += key;
      lcd.print(key);
    }

    if (key == '#') {
      codiceSegreto = inputCode.toInt();
      inputCode = "";
      Serial.print("codiceSegreto\t");
      Serial.println(codiceSegreto);
      lcd.clear();
      lcd.print("Inserisci tempo:");
    }

    if (key == '*') {
      tempoTimer = inputCode.toInt();
      codiceInserito = true;
      lcd.clear();
      lcd.print("Codice e tempo inseriti!");
      Serial.print("tempoTimer\t");
      Serial.println(tempoTimer);
      delay(2000);
      lcd.clear();
    }
  }
}

void gestisciTimer(char tempotimer)
{
  int time;
    time=atoi(tempotimer);
    Serial.print("timer\t");
    Serial.println(time);
    if (tempoTimer > 0) {
    lcd.print(time);
    delay(500);
    lcd.clear();
    delay(1000);
    time--;
    }
    if (tempoTimer == 0) {
      lcd.clear();
      lcd.print("Tempo scaduto!");
    }
}