#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define EVEN_BUTTON_PIN 25
#define ODD_BUTTON_PIN 26

// Define CLEAR_BUTTON_PIN
#define CLEAR_BUTTON_PIN 33

int evenButtonState = 0;
int oddButtonState = 0;
// Declare clearButtonState
int clearButtonState = 0;

// Declare flag variable with name clearButtonPressed
bool evenButtonPressed = false;
bool oddButtonPressed = false;
bool clearButtonPressed = 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(EVEN_BUTTON_PIN, INPUT_PULLUP);  
  pinMode(ODD_BUTTON_PIN, INPUT_PULLUP);
  // Set CLEAR_BUTTON_PIN as INPUT_PULLUP
  pinMode(CLEAR_BUTTON_PIN, INPUT_PULLUP);
}

void loop() {
  evenButtonState = digitalRead(EVEN_BUTTON_PIN);
  oddButtonState = digitalRead(ODD_BUTTON_PIN);
  // Read the clear button state
  clearButtonState = digitalRead(CLEAR_BUTTON_PIN);


  if (evenButtonState == HIGH && !evenButtonPressed) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Even number:");
    lcd.setCursor(0, 1);
    lcd.print(generateEvenRandom()); 
    evenButtonPressed = true;
  } else if (evenButtonState == LOW) {
    evenButtonPressed = false;
  }
  
  if (oddButtonState == HIGH && !oddButtonPressed) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Odd number:");
    lcd.setCursor(0, 1);
    lcd.print(generateOddRandom()); 
    oddButtonPressed = true;
  } else if (oddButtonState == LOW) {
    oddButtonPressed = false;
  }  

  // Write the condition to check whether is clear button pressed or not then accordingly clear the LCD
  if(clearButtonState == HIGH && !clearButtonPressed){
    lcd.clear();
    clearButtonPressed=true;
  }else if (clearButtonState == LOW) {
    clearButtonPressed = false;
  }

  delay(100); 
}

int generateEvenRandom() {
  int number = random(1, 100); 
  return number + (number % 2); 
}


int generateOddRandom() {
  int number = random(1, 100); 
  return number + (1 - (number % 2)); 
}