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 AudioManager _audio;

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

    private void Start()
    {
        _audio = FindObjectOfType<AudioManager>();
        StartCoroutine(LoadAndPlay());
    }

    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);
        }

        // 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((a, b) => a.time.CompareTo(b.time));

        yield return StartCoroutine(Countdown());

        _audio.PlayClip(clip);

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

    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 spawnAt = Mathf.Max(0f, note.time - travelTime);
            yield return new WaitUntil(() => _audio.CurrentTime >= spawnAt);
            SpawnNote(note);
        }
    }

    private void SpawnNote(NoteData note)
    {
        float x = -0.375f + note.position * 0.25f;
        float y = -0.333f + note.lineLayer * 0.333f;

        // 스폰 시점의 실제 남은 시간으로 역산 → 동시 노트가 프레임 차이 나도 같은 타이밍에 도착
        float remaining = note.time - _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             = true,
            speed                = 2f,
            travelTimeOverride   = travelTime,
        };

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

    // 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)
    {
        yield return new WaitUntil(() => _audio.CurrentTime >= clipLength - 0.5f);
        onLevelComplete?.Invoke();
    }
}