#include <LiquidCrystal_I2C.h>

// LCD module connections (change these according to your setup)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Keypad connections (change these according to your setup)
const int ROW_NUM    = 4; // Four rows
const int COLUMN_NUM = 4; // Four columns
const char NO_KEY = '\0'; // Representing no key pressed
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] = {9, 8, 7, 6};       // connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; // connect to the column pinouts of the keypad

int randomNumber;
int guessedNumber;
bool gameFinished = false;

void setup() {
  lcd.begin(16, 2);
  lcd.print("Number Guessing");
  lcd.setCursor(0, 1);
  lcd.print("Game!");
  delay(2000);

  randomSeed(analogRead(0)); // Initialize random seed

  // Generate a random number between 1 and 100
  randomNumber = random(1, 101);

  lcd.clear();
  lcd.print("Guess the number:");
}

void loop() {
  char key = getKeypadInput();

  // If the game is finished, reset the game and generate a new random number
  if (gameFinished) {
    gameFinished = false;
    randomNumber = random(1, 101);

    lcd.clear();
    lcd.print("Guess the number:");
  }

  if (key != NO_KEY) {
    if (key == '#') {
      // User pressed '#' to submit the guessed number
      if (guessedNumber == randomNumber) {
        lcd.clear();
        lcd.print("Correct!");
        gameFinished = true;
      } else if (guessedNumber < randomNumber) {
        lcd.setCursor(0, 1);
        lcd.print("Too Low!       ");
      } else {
        lcd.setCursor(0, 1);
        lcd.print("Too High!      ");
      }
    } else {
      // User entered a digit
      guessedNumber = guessedNumber * 10 + (key - '0');
      lcd.setCursor(0, 1);
      lcd.print(guessedNumber);
    }
  }
}

// Function to read input from the keypad
char getKeypadInput() {
  for (byte r = 0; r < ROW_NUM; r++) {
    pinMode(pin_rows[r], OUTPUT);
    digitalWrite(pin_rows[r], LOW);

    for (byte c = 0; c < COLUMN_NUM; c++) {
      pinMode(pin_column[c], INPUT_PULLUP);
    }

    delay(5); // Short delay for stability

    for (byte c = 0; c < COLUMN_NUM; c++) {
      if (digitalRead(pin_column[c]) == LOW) {
        while (digitalRead(pin_column[c]) == LOW)
          ; // Wait for the key to be released
        digitalWrite(pin_rows[r], HIGH);
        return keys[r][c];
      }
    }

    digitalWrite(pin_rows[r], HIGH);
  }

  return NO_KEY; // No key pressed
}