// --- Indonesia Raya: Buzzer + OLED Lyrics (delay based) + Red/White LED ---
// Board: Arduino UNO
// Buzzer pasif di D8
// LED Merah di D9, LED Putih di D10
// OLED SSD1306 I2C (128x64): SDA=A4, SCL=A5

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define BUZZER_PIN 23
#define LED_RED    9
#define LED_WHITE  10

float tempoScale = 1.0;

// ================== MELODY (singkatkan di sini, isi lengkap sama seperti sebelumnya) ==================
// 0 = rest. Durasi ms. Elemen terakhir durasi = 0 (sentinel).
int melody[] = {
  262,277,311,523,0,523,466,466,415,311,0,311,311,349,311,277,262,233,0,
  233,262,277,466,0,466,415,415,392,349,0,311,311,392,349,311,277,262,0,
  262,277,311,523,0,523,466,466,415,311,0,311,311,349,311,415,466,392,349,
  349,349,554,554,523,466,622,415,392,349,311,554,523,466,415,0,311,311,349,
  554,554,554,554,554,523,415,415,415,392,415,466,622,622,622,554,554,523,
  415,311,311,349,554,554,554,554,554,523,415,415,415,392,415,466,622,622,
  523,466,415,0,415,415,554,698,698,698,698,698,622,523,523,523,622,622,
  554,466,466,466,622,554,523,415,415,415,554,698,698,698,698,698,622,523,
  523,523,622,622,622,554,523,466,523,466,415,0,415,415,622,554,523,466,
  523,466,415,0,0
};

int noteDurations[] = {
  468,156,624,624,468,156,468,156,624,624,624,468,156,624,624,624,624,1248,624,
  468,156,624,624,468,156,468,156,624,624,624,468,156,624,624,624,624,1248,624,
  468,156,624,624,468,156,468,156,624,624,624,468,156,624,624,624,624,1248,624,
  468,156,624,624,624,624,1248,624,468,156,624,624,624,624,1248,624,468,156,624,
  468,156,624,468,156,624,468,156,624,468,156,624,468,156,624,468,156,1248,624,
  468,156,624,468,156,624,468,156,624,468,156,624,468,156,624,624,624,468,156,
  1248,624,468,156,624,468,156,624,468,156,624,468,156,624,468,156,624,468,156,
  624,468,156,1248,624,468,156,624,468,156,624,468,156,624,468,156,624,468,156,
  624,468,156,624,468,156,1248,624,468,156,624,468,156,624,468,156,1248,1248,0
};

// ================== LIRIK BERDASAR DELAY ==================
struct LyricTime {
  unsigned long ms;     // waktu sejak awal lagu
  const char* text;
};

LyricTime lyricTimes[] = {
  {0,   "Indonesia tanah airku" },
  {3750,   "Tanah tumpah darahku" },
  {9000,   "Disanalah aku berdiri" },
  {13750,   "Jadi pandu ibuku" },
  {18500,   "Indonesia kebangsaanku" },
  {24000,   "Bangsa dan tanah airku" },
  {29500,   "Marilah kita berseru" },
  {34500,   "Indonesia bersatu" },
  {39000,  "Hiduplah tanahku" },
  {42000,  "Hiduplah negeriku" },
  {44500,  "Bangsaku rakyatku semuanya" },
  {49300,  "Bangunlah jiwanya" },
  {52000,  "Bangunlah badannya" },
  {54500,  "Untuk Indonesia Raya" },
  {59000,  "Indonesia Raya, merdeka!" },
  {64500,  "Tanahku negeriku yang kucinta" },
  {69500,  "Indonesia Raya, merdeka!" },
  {74500,  "Hiduplah Indonesia Raya" }
};

int lyricCount = sizeof(lyricTimes)/sizeof(lyricTimes[0]);

// ================== OLED ==================
void oledShowLine(const char* line) {
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(0, 28);
  display.println(line);
  display.display();
}

// ================== SETUP ==================
void setup() {
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_RED, OUTPUT);
  pinMode(LED_WHITE, OUTPUT);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    // OLED gagal, lanjut tanpa tampilan
  } else {
    oledShowLine("INDONESIA RAYA");
    delay(1000);
  }

  playIndonesiaRaya();
}

void loop() {}

// ================== PEMUTARAN ==================
void playIndonesiaRaya() {
  unsigned long elapsed = 0;
  int nextLyric = 0;
  int N = sizeof(melody)/sizeof(melody[0]);

  for (int i = 0; i < N; i++) {
    int dur = noteDurations[i];
    if (dur <= 0) break;
    dur = (int)(dur * tempoScale);

    // cek apakah waktunya ganti lirik
    if (nextLyric < lyricCount && elapsed >= lyricTimes[nextLyric].ms) {
      oledShowLine(lyricTimes[nextLyric].text);
      nextLyric++;
    }

    // LED bergantian
    int ledOn  = (i % 2 == 0) ? LED_RED : LED_WHITE;
    int ledOff = (i % 2 == 0) ? LED_WHITE : LED_RED;
    digitalWrite(ledOff, LOW);
    digitalWrite(ledOn, HIGH);

    // mainkan nada
    if (melody[i] > 0) tone(BUZZER_PIN, melody[i], dur*0.9);
    else noTone(BUZZER_PIN);

    delay(dur);
    elapsed += dur;

    noTone(BUZZER_PIN);
    digitalWrite(ledOn, LOW);
  }

  // akhir lagu
  noTone(BUZZER_PIN);
  digitalWrite(LED_RED, LOW);
  digitalWrite(LED_WHITE, LOW);
}