BeatSaber/Assets/Script/SongController.cs

using System.Collections;
using System.Collections.Generic;
using System.IO;
using TMPro;
using UnityEngine;
using UnityEngine.Networking;
using VRBeats;
using VRBeats.ScriptableEvents;

public class SongController : MonoBehaviour
{
    [SerializeField] private Spawneable  cubePrefab;
    [SerializeField] private GameEvent   onLevelComplete;
    [SerializeField] private TMP_Text    countdownText;

    private const float LaneSpacing = 0.42f;
    private const float LayerSpacing = 0.38f;
    private const float HorizontalCenter = 1.5f;
    private const float VerticalCenter = 1f;

    private AudioManager _audio;
    private ScoreManager _scoreManager;
    private float _clipLength;

    private static string CacheRoot =>
        Path.Combine(Application.persistentDataPath, "beatsaber");

    private void Start()
    {
        _audio = FindFirstObjectByType<AudioManager>();
        _scoreManager = FindFirstObjectByType<ScoreManager>();
        StartCoroutine(LoadAndPlay());
    }

    private void Update()
    {
        if (_audio != null && _scoreManager != null && _clipLength > 0.0f)
            _scoreManager.SetSongProgress(_audio.CurrentTime, _clipLength);
    }

    private IEnumerator LoadAndPlay()
    {
        SongInfo song = GameSession.SelectedSong;
        string   diff = GameSession.SelectedDifficulty;

        if (song == null || string.IsNullOrEmpty(diff))
        {
            Debug.LogError("[SongController] No song/difficulty selected");
            yield break;
        }

        // Load audio clip from local cache
        string audioPath = Path.Combine(CacheRoot, song.id, song.id + ".mp3");
        AudioClip clip;
        using (var req = UnityWebRequestMultimedia.GetAudioClip("file://" + audioPath, AudioType.MPEG))
        {
            yield return req.SendWebRequest();
            if (req.result != UnityWebRequest.Result.Success)
            {
                Debug.LogError($"[SongController] Audio load failed: {req.error}");
                yield break;
            }
            clip = DownloadHandlerAudioClip.GetContent(req);
        }
        _clipLength = clip.length;

        // Load and parse map
        DifficultyInfo diffInfo = song.difficulties.Get(diff);
        if (diffInfo == null)
        {
            Debug.LogError($"[SongController] Difficulty '{diff}' not found");
            yield break;
        }
        string mapPath = Path.Combine(CacheRoot, song.id, Path.GetFileName(diffInfo.mapFile));
        if (!File.Exists(mapPath))
        {
            Debug.LogError($"[SongController] Map file missing: {mapPath}");
            yield break;
        }
        MapData map = JsonUtility.FromJson<MapData>(File.ReadAllText(mapPath));
        if (map?.target == null)
        {
            Debug.LogError("[SongController] Map parse failed");
            yield break;
        }
        map.target.Sort(CompareNotes);
        _scoreManager?.SetTotalNotes(map.target.Count);

        yield return StartCoroutine(Countdown());

        _audio.PlayClip(clip);

        StartCoroutine(SpawnRoutine(map.target));
        yield return StartCoroutine(WaitForCompletion(clip.length, map.target));
    }

    private IEnumerator Countdown()
    {
        if (countdownText == null) yield break;
        countdownText.gameObject.SetActive(true);

        string[] labels   = { "3", "2", "1", "GO!" };
        float[]  durations = { 1f,  1f,  1f,  0.6f  };

        for (int i = 0; i < labels.Length; i++)
        {
            countdownText.text = labels[i];
            yield return new WaitForSeconds(durations[i]);
        }

        countdownText.gameObject.SetActive(false);
    }

    private IEnumerator SpawnRoutine(List<NoteData> notes)
    {
        float travelTime = VR_BeatManager.instance.GameSettings.TargetTravelTime;

        foreach (NoteData note in notes)
        {
            float adjustedNoteTime = note.time + GlobalSyncSettings.AudioOffsetSeconds;
            float spawnAt = Mathf.Max(0f, adjustedNoteTime - travelTime);
            yield return new WaitUntil(() => _audio.CurrentTime >= spawnAt);
            SpawnNote(note);
        }
    }

    private void SpawnNote(NoteData note)
    {
        float x = MapLaneX(note.position);
        float y = MapLayerY(note.lineLayer);

        // 스폰 시점의 실제 남은 시간으로 역산 → 동시 노트가 프레임 차이 나도 같은 타이밍에 도착
        float remaining = note.time + GlobalSyncSettings.AudioOffsetSeconds - _audio.CurrentTime;
        float travelTime = Mathf.Max(0.05f, remaining);

        var info = new SpawnEventInfo
        {
            position             = new Vector3(x, y, 0f),
            colorSide            = note.colorType == 0 ? ColorSide.Left : ColorSide.Right,
            hitDirection         = MapCutDirection(note.cutDirection),
            useSpark             = false,
            speed                = 2f,
            travelTimeOverride   = travelTime,
        };

        VR_BeatManager.instance.Spawn(cubePrefab, info);
    }

    private static int CompareNotes(NoteData a, NoteData b)
    {
        int timeCompare = a.time.CompareTo(b.time);
        if (timeCompare != 0)
            return timeCompare;

        int positionCompare = a.position.CompareTo(b.position);
        if (positionCompare != 0)
            return positionCompare;

        return a.lineLayer.CompareTo(b.lineLayer);
    }

    private static float MapLaneX(int position)
    {
        int lane = Mathf.Clamp(position, 0, 3);
        return (lane - HorizontalCenter) * LaneSpacing;
    }

    private static float MapLayerY(int lineLayer)
    {
        int layer = Mathf.Clamp(lineLayer, 0, 2);
        return (layer - VerticalCenter) * LayerSpacing;
    }

    // Beat Saber cutDirection → VRBeats Direction
    // BS: 0=Up 1=Down 2=Left 3=Right 4=UpperLeft 5=UpperRight 6=LowerLeft 7=LowerRight 8=Any
    private static readonly Direction[] CutDirMap =
    {
        Direction.Up,
        Direction.Down,
        Direction.Left,
        Direction.Right,
        Direction.UpperLeft,
        Direction.UpperRight,
        Direction.LowerLeft,
        Direction.LowerRight,
        Direction.Center,
    };

    private static Direction MapCutDirection(int cut)
        => (cut >= 0 && cut < CutDirMap.Length) ? CutDirMap[cut] : Direction.Center;

    private IEnumerator WaitForCompletion(float clipLength, List<NoteData> notes)
    {
        float lastNoteTime = notes.Count > 0 ? notes[notes.Count - 1].time : 0.0f;
        float resultTime = Mathf.Min(clipLength, lastNoteTime + GlobalSyncSettings.AudioOffsetSeconds + 0.35f);
        yield return new WaitUntil(() => _audio.CurrentTime >= resultTime);
        yield return new WaitForSeconds(0.35f);
        _scoreManager?.CompleteSong();
        onLevelComplete?.Invoke();
    }
}