#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4);  // Set the LCD address to 0x27 for a 20x4 display

const int enterButton = 2;  // Button pin for Enter
const int setButton = 3;    // Button pin for Set Set
const int resetButton = 4;  // Button pin for Reset

unsigned long previousMillis = 0;
const long interval = 1000;  // Update interval for the clock display
int step = 0;

void setup() {
  lcd.init();                      // Initialize the LCD
  lcd.backlight();                 // Turn on the backlight

  pinMode(enterButton, INPUT_PULLUP);  // Set Enter button as input with internal pull-up resistor
  pinMode(setButton, INPUT_PULLUP);    // Set Set button as input with internal pull-up resistor
  pinMode(resetButton, INPUT_PULLUP);  // Set Reset button as input with internal pull-up resistor
}

void loop() {
  unsigned long currentMillis = millis();

  // Check the current step and display the corresponding text
  switch (step) {
    case 0:  // Display "VINCE JULIAN S. DAY" for 3 seconds
      if (currentMillis < 3000) {
        lcd.setCursor(0, 0);
        lcd.print("VINCE JULIAN S. DAY");
      } else if (currentMillis < 4000) {
        lcd.clear();
      } else {
        step = 1;  // Move to the next step
      }
      break;
      
    case 1:  // Display "BSIT 2-A ELX" for 3 seconds
      if (currentMillis < 7000) {
        lcd.setCursor(0, 0);
        lcd.print("BSIT 2-A ELX");
      } else if (currentMillis < 8000) {
        lcd.clear();
      } else {
        step = 2;  // Move to the next step
      }
      break;
      
    case 2:  // Display "SMART FISH AQUARIUM" for 2 seconds
      if (currentMillis < 10000) {
        lcd.setCursor(0, 0);
        lcd.print("SMART FISH AQUARIUM");
      } else if (currentMillis < 12000) {
        lcd.clear();
      } else {
        step = 3;  // Move to the next step
      }
      break;
      
    case 3:  // Show the time and date May 9, 2024 11:29pm
      if (currentMillis < 16000) {
        lcd.setCursor(0, 0);
        lcd.print("Date: May 9, 2024");
        lcd.setCursor(0, 1);
        lcd.print("Time: 11:46 PM");
      } else {
        // Digital clock function using buttons Enter, Set, and Reset
        if (currentMillis - previousMillis >= interval) {
          previousMillis = currentMillis;

          // Get the current time
          int hours = (currentMillis / 1000 / 3600) % 24;
          int minutes = (currentMillis / 1000 / 60) % 60;
          int seconds = (currentMillis / 1000) % 60;

          lcd.setCursor(0, 2);
          lcd.print("Current Time: ");
          if (hours < 10) {
            lcd.print("0");
          }
          lcd.print(hours);
          lcd.print(":");
          if (minutes < 10) {
            lcd.print("0");
          }
          lcd.print(minutes);
          lcd.print(":");
          if (seconds < 10) {
            lcd.print("0");
          }
          lcd.print(seconds);
        }
      }
      break;
  }

  // Check if buttons are pressed
  if (digitalRead(enterButton) == LOW) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Enter Button Pressed");
    delay(1000);
  }
  
  if (digitalRead(setButton) == LOW) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Set Button Pressed");
    delay(1000);
  }
  
  if (digitalRead(resetButton) == LOW) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Reset Button Pressed");
    delay(1000);
  }
}