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

LiquidCrystal_I2C lcd(0x27, 16, 2);

// ================= PIN =================
#define BUZZER_PIN 18
#define RED_PIN    25
#define GREEN_PIN  26
#define BLUE_PIN   27

// ================= PWM =================
#define PWM_RES 8   // 0–255

// ================= TEMPO =================
float speedFactor = 0.45;

// ================= MELODY =================
int melody[] = {
  264, 264, 297, 264, 352, 330,
  264, 264, 297, 264, 396, 352,
  264, 264, 528, 440, 352, 330, 297,
  466, 466, 440, 352, 396, 352
};

int durations[] = {
  250, 250, 500, 500, 500, 1000,
  250, 250, 500, 500, 500, 1000,
  250, 250, 500, 500, 500, 500, 1000,
  250, 250, 500, 500, 500, 1000
};

String nama = "Anggela Fera T.A.";

// ================= RGB =================
void setRGB(int r, int g, int b) {
  ledcWrite(RED_PIN, r);
  ledcWrite(GREEN_PIN, g);
  ledcWrite(BLUE_PIN, b);
}

// ================= MUSIC + RGB SYNC =================
void playBirthday() {
  for (int i = 0; i < 25; i++) {
    int dur = durations[i] * speedFactor;
    int nada = melody[i];

    int bright = map(nada, 200, 600, 80, 255);
    bright = constrain(bright, 80, 255);

    if (nada < 300) {
      setRGB(bright, 0, 0);      // MERAH
    } else if (nada < 400) {
      setRGB(0, bright, 0);      // HIJAU
    } else {
      setRGB(0, 0, bright);      // BIRU
    }

    ledcWriteTone(BUZZER_PIN, nada);
    delay(dur);

    ledcWriteTone(BUZZER_PIN, 0);
    setRGB(0, 0, 0);
    delay(40);
  }
}

// ================= LCD =================
void tampilPesan(String atas, String bawah, int waktu) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(atas);
  lcd.setCursor(0, 1);
  lcd.print(bawah);
  delay(waktu);
}

// ================= COUNTDOWN =================
void hitungMundur() {
  for (int i = 3; i > 0; i--) {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("HITUNG MUNDUR");
    lcd.setCursor(7, 1);
    lcd.print(i);

    setRGB(255, 255, 255);
    ledcWriteTone(BUZZER_PIN, 1000);
    delay(300);
    ledcWriteTone(BUZZER_PIN, 0);
    setRGB(0, 0, 0);
    delay(700);
  }
}

// ================= SETUP =================
void setup() {
  lcd.init();
  lcd.backlight();

  // Attach PWM (API BARU)
  ledcAttach(BUZZER_PIN, 2000, PWM_RES);

  ledcAttach(RED_PIN, 5000, PWM_RES);
  ledcAttach(GREEN_PIN, 5000, PWM_RES);
  ledcAttach(BLUE_PIN, 5000, PWM_RES);

  hitungMundur();
  tampilPesan("HAPPY BIRTHDAY", nama, 3000);
  playBirthday();

  tampilPesan("SUDAH 23 TAHUN", "WANITA HEBATKUU", 3000);
  tampilPesan("KUAT, PINTAR", "& TANGGUHH", 3000);
  tampilPesan("SEMANGAT TERUS", "SAYANGKUU", 3000);
  tampilPesan("AKU BANGGA", "PADAMUU <3", 4000);
}

void loop() {}