#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
// Define EVEN_BUTTON_PIN and ODD_BUTTON_PIN
#define EVEN_BUTTON_PIN 25
#define ODD_BUTTON_PIN 26

// Even and odd buttonstate variables
int evenButtonState = 0;
int oddButtonState = 0;

// Boolean variables for odd and even to check the button is pressed or not
bool evenButtonPressed = false;
bool oddButtonPressed = false;

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  lcd.init();
  lcd.backlight();
  lcd.setCursor(2,0);
  lcd.print("Hello ");
  lcd.setCursor(2,1);
  lcd.print("Everyone..!");
  
  delay(1000);
  
  lcd.clear();
  lcd.setCursor(3, 0);
  lcd.print("Welcome to");
  lcd.setCursor(0, 1);

  String message = "Number Generator";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(100);
  }

  // pinMode set as the INPUT_PULLUP for even and odd button
  pinMode(EVEN_BUTTON_PIN, INPUT_PULLUP);  
  pinMode(ODD_BUTTON_PIN, INPUT_PULLUP);
     
}

void loop() {
  // Reading the state of the even and odd button 
  evenButtonState = digitalRead(EVEN_BUTTON_PIN);
  oddButtonState = digitalRead(ODD_BUTTON_PIN);

  // Write a condition to check if the even button is pressed or not accordingly call the function generateEvenRandom
  if (evenButtonState == HIGH && !evenButtonPressed) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Even number:");
    lcd.setCursor(0, 1);
    // Generate a random even number
    lcd.print(generateEvenRandom()); 
    evenButtonPressed = true;
  } else if (evenButtonState == LOW) {
    evenButtonPressed = false;
  }
  
  // Write a condition to check if the odd button is pressed or not accordingly call the function generateOddRandom
  if (oddButtonState == HIGH && !oddButtonPressed) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Odd number:");
    lcd.setCursor(0, 1);
    lcd.print(generateOddRandom()); // Generate a random odd number
    oddButtonPressed = true;
  } else if (oddButtonState == LOW) {
    oddButtonPressed = false;
  }

  // Delay to debounce the buttons
  delay(100); 
  
}

int generateEvenRandom() {
  // Generating a random number between 1 and 99
  int number = random(1, 100); 
  // Round up to the nearest even number
  return number + (number % 2); 
}

// Write code to genrate odd random numbers
int generateOddRandom() {
  // Generate a random number between 1 and 99
  int number = random(1, 100); 
  // Round up to the nearest odd number
  return number + (1 - (number % 2)); 
}