#include <Wire.h> // Library untuk komunikasi I2C
#include <LiquidCrystal_I2C.h> // Library LCD I2C
#include <Keypad.h> // Library keypad

LiquidCrystal_I2C lcd(0x27, 20, 4); // Inisialisasi LCD dengan alamat 0x27 dan ukuran 20x4

const int buzzerPin = 10; // Pin output buzzer

// Konfigurasi keypad
const byte ROW_NUM = 4; // Jumlah baris keypad
const byte COLUMN_NUM = 4; // Jumlah kolom keypad

// Matriks karakter untuk keypad
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

// Definisi nada frekuensi musik
const uint8_t pin = 10;

// Notasi nada dengan frekuensi dalam Hertz
#define C3  130.81
#define Db3 138.59
#define D3  146.83
#define Eb3 155.56
#define E3  164.81
#define F3  174.61
#define Gb3 185.00
#define G3  196.00
#define Ab3 207.65
#define LA3 220.00
#define Bb3 233.08
#define B3  246.94
#define C4  261.63
#define Db4 277.18
#define D4  293.66
#define Eb4 311.13
#define E4  329.63
#define F4  349.23
#define Gb4 369.99
#define G4  392.00
#define Ab4 415.30
#define LA4 440.00
#define Bb4 466.16
#define B4  493.88
#define C5  523.25
#define Db5 554.37
#define D5  587.33
#define Eb5 622.25
#define E5  659.26
#define F5  698.46
#define Gb5 739.99
#define G5  783.99
#define Ab5 830.61
#define LA5 880.00
#define Bb5 932.33
#define B5  987.77

// Durasi nada berdasarkan tempo
#define BPM 120 // Beats per Minute
#define Q 60000/BPM // Quarter note (1/4)
#define H 2*Q // Half note (2/4)
#define E Q/2 // Eighth note (1/8)
#define S Q/4 // Sixteenth note (1/16)
#define W 4*Q // Whole note (4/4)

// Konfigurasi pin untuk baris dan kolom keypad
byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // Pin baris keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; // Pin kolom keypad

Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM);

void setup() {
  lcd.begin(20, 4); // Inisialisasi LCD ukuran 20x4
  lcd.backlight(); // Nyalakan backlight LCD
  pinMode(buzzerPin, OUTPUT); // Set buzzerPin sebagai output
}

void loop() {
  // Tampilkan menu utama
  lcd.setCursor(0, 0); lcd.print("1. Custom Play");
  lcd.setCursor(0, 1); lcd.print("2. Music Select");
  lcd.setCursor(0, 2); lcd.print("3. Volume Setting");
  lcd.setCursor(0, 3); lcd.print("                    ");
  char key = keypad.getKey(); // Baca tombol yang ditekan

  if (key) {
    handleKeyPress(key); // Panggil fungsi sesuai tombol
  }
}

// Fungsi untuk menangani input tombol menu utama
void handleKeyPress(char key) {
  switch (key) {
    case '1': customPlay(); break;
    case '2': lcd.clear(); musicSelect(); break;
    case '3': volumeSetting(); break;
    default: break;
  }
}

// Fungsi untuk memainkan nada sesuai tombol 1–9
void customPlay() {
  lcd.clear();
  lcd.print("Custom Play");
  lcd.setCursor(0, 1);
  lcd.print("1-9: Notes, #:Exit");

  while (true) {
    char key = keypad.getKey(); // Baca tombol
    if (key == '#') {
      lcd.clear();
      return; // Keluar dari mode
    }

    float freq = 0; // Frekuensi default

    // Set frekuensi berdasarkan tombol ditekan
    switch (key) {
      case '1': freq = C4; break;
      case '2': freq = D4; break;
      case '3': freq = E4; break;
      case '4': freq = F4; break;
      case '5': freq = G4; break;
      case '6': freq = LA4; break;
      case '7': freq = B4; break;
      case '8': freq = C5; break;
      case '9': freq = Bb4; break;
    }

    if (freq > 0) {
      tone(buzzerPin, freq, 200); // Mainkan nada selama 200ms
      delay(220); // Tunggu sejenak
    }
  }
}

// Fungsi menu untuk memilih lagu
void musicSelect() {
  lcd.clear();
  lcd.setCursor(0, 0); lcd.print("Music Select");
  lcd.setCursor(0, 1); lcd.print("1. Airtel");
  lcd.setCursor(0, 2); lcd.print("2. Gundul Pacul");
  lcd.setCursor(0, 3); lcd.print("3. Happy Birthday");

  char key;
  do {
    key = keypad.getKey();
    if (key == '1') {
      airtel_song();
      lcd.clear();
      return;
    } else if (key == '2') {
      gungul_gungul_pacul();
      lcd.clear();
      return;
    } else if (key == '3') {
      happy_birthday();
      lcd.clear();
      return;
    }
  } while (key != '#');
}

// Fungsi pengaturan volume (simulasi tampilan)
void volumeSetting() {
  lcd.clear();
  lcd.print("Volume Setting");
  lcd.setCursor(0, 1);
  lcd.print("Use A/B keys");

  int volume = 5; // Level volume awal
  displayVolume(volume); // Tampilkan level

  while (true) {
    char key = keypad.getKey();
    if (key == '#') {
      lcd.clear();
      return; // Keluar mode
    }
    if (key == 'A' && volume < 10) {
      volume++;
      displayVolume(volume);
    } else if (key == 'B' && volume > 0) {
      volume--;
      displayVolume(volume);
    }
  }
}

// Menampilkan level volume ke LCD
void displayVolume(int volume) {
  lcd.setCursor(0, 2);
  lcd.print("Volume: ");
  lcd.print(volume);
  lcd.print("     "); // Spasi untuk menimpa sisa karakter lama
}

// Fungsi pemutar lagu Airtel
void airtel_song() {
  // Mainkan nada per baris lagu (lihat komentar baris demi baris di versi sebelumnya)
  // Line1
    tone(pin,LA4,Q);delay(1+Q);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,LA4,Q);delay(1+Q);
    tone(pin,E5,E);delay(1+E);
    
    delay(1+E); 
    tone(pin,B4,E);delay(1+E);
    tone(pin,C5,E);delay(1+E);
    tone(pin,B4,E);delay(1+E);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,G4,Q);delay(1+Q);
    tone(pin,B4,Q);delay(1+Q); 

   // Line2
    tone(pin,LA4,E);delay(1+E);
    tone(pin,B4,E);delay(1+E);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,G4,E);delay(1+E);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,B4,E);delay(1+E); 
    tone(pin,C5,E);delay(1+E);delay(1+E);
    tone(pin,B4,H);delay(1+H);
    tone(pin,LA4,E);delay(1+E);
    tone(pin,G4,E);delay(1+E);
    tone(pin,E4,H);delay(1+H); 

   //Line3
  
    tone(pin,LA5,Q);delay(1+Q);
    tone(pin,E5,Q);delay(1+Q);
    tone(pin,G5,Q);delay(1+Q);
    tone(pin,E5,E);delay(1+E);
    
    delay(1+E);
    tone(pin,E5,Q);delay(1+Q);
    tone(pin,D5,Q);delay(1+Q); 
    tone(pin,C5,Q);delay(1+Q);
    tone(pin,LA4,Q);delay(1+Q); 

    //Line4
 
    tone(pin,C5,Q);delay(1+Q);
    tone(pin,D5,Q);delay(1+Q);
    tone(pin,E5,Q);delay(1+Q);
    tone(pin,F5,E);delay(1+E);
    
    delay(1+E);
    tone(pin,D5,W);delay(1+W);
    tone(pin,C5,E);delay(1+E); 
    tone(pin,B4,E);delay(1+E);
    tone(pin,LA4,E);delay(1+E); 
}

// Fungsi lagu Gundul Gundul Pacul
void gungul_gungul_pacul() {
  // Mainkan lagu tradisional baris demi baris
  lcd.clear();
  lcd.print(" gundul pacul");
  delay(500);

  // Baris 1: Gundul gundul pacul cul (1 3 1 3 4 5 5)
  tone(pin, C4, E); delay(E + 1);     // 1
  tone(pin, E4, E); delay(E + 1);     // 3
  tone(pin, C4, E); delay(E + 1);     // 1
  tone(pin, E4, E); delay(E + 1);     // 3
  tone(pin, F4, Q); delay(Q + 1);     // 4
  tone(pin, G4, E); delay(E + 1);     // 5
  delay(1+S); 
  tone(pin, G4, E); delay(E + 1);     // 5
  delay(1+E);

  // Baris 2: Gembelengan (7 1' 7 1' 7 5)
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, C5, E); delay(E + 10);     // 1'
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, C5, E); delay(E + 10);     // 1'
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, G4, Q); delay(Q + 10);     // 5
  delay(1+E);

  // Baris 3: Nyunggi nyunggi wakul kul (1 3 1 3 4 5 5)
  tone(pin, C4, E); delay(E + 10);     // 1
  tone(pin, E4, E); delay(E + 10);     // 3
  tone(pin, C4, E); delay(E + 10);     // 1
  tone(pin, E4, E); delay(E + 10);     // 3
  tone(pin, F4, Q); delay(Q + 10);     // 4
  tone(pin, G4, E); delay(E + 10);     // 5
  delay(1+S); 
  tone(pin, G4, E); delay(E + 10);     // 5
  delay(1+E);

  // Baris 4: Gembelengan (7 1' 7 1' 7 5)
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, C5, E); delay(E + 10);     // 1'
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, C5, E); delay(E + 10);     // 1'
  tone(pin, B4, E); delay(E + 10);     // 7
  tone(pin, G4, Q); delay(Q + 10);     // 5
  delay(1+E);

  // Baris 5–6: Wakul ngglimpang segane dadi sak latar (diulang 2x)
  int melody[] = {
    C4, E4, G4, F4,    // Wakul ngglimpang
    F4, G4, F4, E4,    // segane dadi
    C4, F4, E4, C4     // sak latar
  };

  for (int i = 0; i < 2; i++) {
    for (int j = 0; j < 4; j++) {
      tone(pin, melody[j], Q);
      delay(Q + 10);
    }
    delay(1+E);
    for (int j = 4; j < 12; j++) {
      tone(pin, melody[j], Q);
      delay(Q + 10);
    }
  }

  lcd.clear();
}

// Fungsi lagu Happy Birthday
void happy_birthday() {
  // Mainkan lagu ulang tahun baris demi baris
  lcd.clear();
  lcd.print("Happy Birthday");
  delay(500);

  // Baris 1: 5 5 6 5 1' 7 (Happy birthday to you)
  tone(pin, G4, Q); delay(Q + 10);
  delay(1+S);
  tone(pin, G4, Q); delay(Q + 10);
  tone(pin, LA4, H); delay(H + 10);  // Nada ke-3 lebih panjang
  tone(pin, G4, H); delay(H + 10);
  tone(pin, C5, H); delay(H + 10);
  tone(pin, B4, W); delay(W + 10);

  // Baris 2: 5 5 6 5 2' 1' (Happy birthday to you)
  tone(pin, G4, Q); delay(Q + 10);
  delay(1+S);
  tone(pin, G4, Q); delay(Q + 10);
  tone(pin, LA4, H); delay(H + 10);
  tone(pin, G4, H); delay(H + 10);
  tone(pin, D5, H); delay(H + 10);
  tone(pin, C5, W); delay(W + 10);

  // Baris 3:  5 5 3' 1' 1' 1' 7 6 (Happy birthday dear [nama])
  tone(pin, G4, Q); delay(Q + 10);
  delay(1+S);
  tone(pin, G4, Q); delay(Q + 10);
  tone(pin, E5, H); delay(H + 10);
  tone(pin, C5, H); delay(H + 10);
  delay(1+S);
  tone(pin, C5, H); delay(Q + 10);
  delay(1+S);
  tone(pin, C5, Q); delay(Q + 10);
  tone(pin, B4, Q); delay(Q + 10);
  tone(pin, LA4, W); delay(W + 10);

  // Baris 4: 4 4 3' 1' 2' 1' (Happy birthday to you)
  tone(pin, F5, Q); delay(Q + 10);
  delay(1+S);
  tone(pin, F5, Q); delay(Q + 10);
  tone(pin, E5, H); delay(H + 10);
  tone(pin, C5, H); delay(H + 10);
  tone(pin, D5, H); delay(H + 10);
  tone(pin, C5, W); delay(W + 10);

  lcd.clear();
}