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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Sesuaikan alamat I2C jika diperlukan

const int buzzerPin = 9;
const int ledPins[] = {10, 11, 12};
const int buttonPin = 2; // Pin yang digunakan untuk tombol push button

const char *birthdayName = "Cheraku";

// Notes of the melody (Happy Birthday)
const int melody[] = {
  262, 262, 294, 262, 349, 330,
  262, 262, 294, 262, 392, 349,
  262, 262, 523, 440, 349, 330, 294,
  466, 466, 440, 349, 392, 349
};

// Note durations: 4 = quarter note, 8 = eighth note, etc.
const int noteDurations[] = {
  8, 8, 4, 4, 4, 2,
  8, 8, 4, 4, 4, 2,
  8, 8, 4, 4, 4, 4, 2,
  8, 8, 4, 4, 4, 2
};

// Lirik lagu Happy Birthday
const char* lyrics[] = {
  "Happy", "Birthday", "to", "You",
  "Happy", "Birthday", "to", "You",
  "Happy", "Birthday", "dear", birthdayName,
  "Happy", "Birthday", "to", "You"
};

int lyricIndex = 0;  // Index untuk mengakses lirik
bool birthdaySongPlaying = true;

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

  // Initialize LED pins
  for (int i = 0; i < 3; i++) {
    pinMode(ledPins[i], OUTPUT);
  }

  // Initialize button pin
  pinMode(buttonPin, INPUT); // Mengaktifkan pull-up resistor internal

  // Display welcome message
  lcd.setCursor(0, 0);
  lcd.print("Happy Birthday");
  lcd.setCursor(0, 1);
  lcd.print(birthdayName);
  delay(5000); // Wait for 2 seconds

  // Clear LCD
  lcd.clear();
}

void loop() {
  // Play the melody and control LEDs and LCD
  for (int i = 0; i < 25 && birthdaySongPlaying; i++) {
    int noteDuration = 1000 / noteDurations[i];
    tone(buzzerPin, melody[i], noteDuration);

    // Control LEDs according to the beat
    digitalWrite(ledPins[i % 3], HIGH); // Turn on LED

    // Display lyrics on LCD
    if (i == 0 || (i > 0 && shouldDisplayNewLyric(i))) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print(lyrics[lyricIndex]);
      if (lyricIndex == 9) { // Split 'dear [name]' into two lines for better display
        lcd.setCursor(0, 1);
        lcd.print(birthdayName);
      }
    }

    delay(noteDuration);  // Note is played
    digitalWrite(ledPins[i % 3], LOW); // Turn off LED

    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);
  }

  if (birthdaySongPlaying) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("LoveU Babe");
    delay(3000); // Wait for 3 seconds
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Dari Zidni");
    lcd.setCursor(0, 1);
    lcd.print("Aku Sayang Kamu");
    
    // Wait for button press
    while (digitalRead(buttonPin) == LOW) {
      // Tunggu sampai tombol ditekan
      delay(10); // Debounce delay
    }
    
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Langgeng");
    lcd.setCursor(0, 1);
    lcd.print("Ya Sayang!");

    // Beep the buzzer briefly
    tone(buzzerPin, 1000, 200); // Frequency 1000 Hz, duration 200 ms
    delay(200); // Wait for the beep to finish

    delay(2000); // Display for 2 seconds

    // Turn off LCD, buzzer, and LEDs
    lcd.clear();
    noTone(buzzerPin);
    for (int i = 0; i < 3; i++) {
      digitalWrite(ledPins[i], LOW);
    }

    birthdaySongPlaying = false; // Stop playing the birthday song
  }

  // Delay before ending the program
  delay(2000);
}

bool shouldDisplayNewLyric(int noteIndex) {
  // Determine if the lyric should change based on note index
  if (noteIndex == 23) { // After the second "Happy Birthday"
    lyricIndex++;
    return true;
  } else if (strcmp(lyrics[lyricIndex], "to") == 0 || strcmp(lyrics[lyricIndex], "You") == 0) {
    lyricIndex++;  // Increment for single-note words
    return true;
  } else {
    if (noteIndex % 2 == 0) { // Change lyric every two notes otherwise
      lyricIndex++;
      return true;
    }
  }
  return false;
}