using System.IO;
using UnityEngine;
using UnityEngine.UI;


public class BeatmapManager : MonoBehaviour

{
    public Beatmap beatmap;  // 当前谱面数据

    // 音符生成器引用
    public NoteSpawner noteSpawner;

    // Extra fields from beatmap JSON (stored temporarily)
    [HideInInspector] public string parsedTitle;
    [HideInInspector] public string parsedComposer;
    [HideInInspector] public string parsedIllustrator;
    [HideInInspector] public string parsedCharter;
    [HideInInspector] public string parsedBeatmapId;
    [HideInInspector] public string parsedDifficultyName;
    [HideInInspector] public string parsedCreatedDate;
    [HideInInspector] public string parsedLastSavedTime;
    [HideInInspector] public string parsedMusicFile;
    [HideInInspector] public string parsedBackgroundFile;

    [HideInInspector] public int parsedDuration; // as int per request
    [HideInInspector] public int parsedBpm; // as int per request
    [HideInInspector] public int parsedDifficulty; // duplicate of beatmap.difficulty
    [HideInInspector] public int parsedNoteAmount;

    [HideInInspector] public float globalDelaySeconds = 0f;

    // 从 JSON 文件加载谱面数据
    public void LoadBeatmap(string fileName)
    {
        string path = Application.streamingAssetsPath + "/" + fileName;
        if (File.Exists(path))
        {
            string json = File.ReadAllText(path);
            Debug.Log("谱面 JSON 已读取: " + path);
            ProcessJsonAndLoad(json);
        }
        else
        {
            Debug.LogError("文件不存在：" + path);
        }
    }

    // 新增：从原始 JSON 字符串加载谱面（允许任意磁盘路径先读取后传入）
    public void LoadBeatmapFromJsonString(string json)
    {
        if (string.IsNullOrEmpty(json))
        {
            Debug.LogError("LoadBeatmapFromJsonString: json is null or empty");
            return;
        }
        ProcessJsonAndLoad(json);
    }

    // 新增：解析 JSON 但不启动 NoteSpawner（用于 test mode 的延迟开始）
    public bool ParseJsonOnly(string json)
    {
        if (string.IsNullOrEmpty(json))
        {
            Debug.LogError("ParseJsonOnly: json is empty");
            return false;
        }

        // Parse main beatmap
        Beatmap parsed = null;
        try
        {
            parsed = JsonUtility.FromJson<Beatmap>(json);
        }
        catch (System.Exception ex)
        {
            Debug.LogError($"ParseJsonOnly 解析 Beatmap 失败: {ex}");
            return false;
        }

        if (parsed == null)
        {
            Debug.LogError("ParseJsonOnly: 解析 Beatmap 返回 null");
            return false;
        }

        // Parse extras
        BeatmapExtra extra = null;
        try
        {
            extra = JsonUtility.FromJson<BeatmapExtra>(json);
        }
        catch { extra = null; }

        if (extra != null)
        {
            parsedTitle = extra.title;
            parsedComposer = extra.composer;
            parsedIllustrator = extra.illustrator;
            parsedCharter = extra.charter;
            parsedBeatmapId = extra.beatmapId;
            parsedDifficultyName = extra.difficultyName;
            parsedCreatedDate = extra.createdDate;
            parsedLastSavedTime = extra.lastSavedTime;
            parsedMusicFile = extra.musicFile;
            parsedBackgroundFile = extra.backgroundFile;

            parsedDuration = extra.duration;
            parsedBpm = extra.bpm;
            parsedDifficulty = extra.difficulty;
            parsedNoteAmount = extra.noteAmount;
            globalDelaySeconds = extra.globalDelaySeconds;

            if (!string.IsNullOrEmpty(extra.musicFile)) parsed.musicFile = extra.musicFile;
            if (!string.IsNullOrEmpty(extra.backgroundFile)) parsed.backgroundFile = extra.backgroundFile;
        }
        else
        {
            parsedTitle = parsed.title;
            parsedComposer = parsed.composer;
            parsedIllustrator = parsed.illustrator;
            parsedCharter = parsed.charter;
            parsedBeatmapId = parsed.beatmapId;
            parsedDifficultyName = parsed.difficultyName;
            parsedCreatedDate = parsed.createdDate;
            parsedMusicFile = parsed.musicFile;
            parsedBackgroundFile = parsed.backgroundFile;

            parsedDuration = Mathf.RoundToInt(parsed.duration);
            parsedBpm = Mathf.RoundToInt(parsed.bpm);
            parsedDifficulty = parsed.difficulty;
        }

        // NOTE: Do NOT modify parsed.notes here. globalDelaySeconds will be applied to audio playback instead.

        beatmap = parsed;
        Debug.Log("ParseJsonOnly: parsed beatmap " + beatmap.title);
        return true;
    }

    // 直接传入已经解析的 Beatmap（兼容旧调用）
    public void LoadBeatmap(Beatmap loadedBeatmap)
    {
        beatmap = loadedBeatmap;
        Debug.Log("谱面已加载（来自 Beatmap 对象）：" + (beatmap != null ? beatmap.title : "null"));
        // No globalDelaySeconds available in this path. Call NoteSpawner directly.
        noteSpawner.LoadBeatmap(beatmap);
    }

    // 读取并加载当前谱面到音符生成器（备用）
    public void LoadBeatmapFromFile()
    {
        string path = Application.streamingAssetsPath + "/Emilia_demo.json";
        if (File.Exists(path))
        {
            string json = File.ReadAllText(path);
            ProcessJsonAndLoad(json);
        }
        else
        {
            Debug.LogError("谱面文件未找到！");
        }
    }

    // 在 Start() 方法中初始化
    void Start()
    {
        // 如果处于测试模式，则跳过自动加载谱面
        if (GameConfig.testMode)
        {
            Debug.Log("Test mode active: skipping automatic beatmap load in BeatmapManager.Start");
        }
        else
        {
            // 加载默认谱面
            LoadBeatmap("Emilia_demo.json");  // 加载并实例化音符
        }
           
    }

    // Helper class used to parse extra fields from JSON that Beatmap doesn't define
    [System.Serializable]
    private class BeatmapExtra
    {
        public string title;
        public string composer;
        public string illustrator;
        public string charter;
        public string beatmapId;
        public int duration; // as int per request
        public int bpm; // as int per request
        public int difficulty;
        public string difficultyName;
        public string createdDate;
        public string lastSavedTime;
        public string musicFile;
        public string backgroundFile;
        public int noteAmount;
        public float globalDelaySeconds;
    }

    // Parse JSON string to Beatmap and extras, then pass to NoteSpawner
    private void ProcessJsonAndLoad(string json)
    {
        if (string.IsNullOrEmpty(json))
        {
            Debug.LogError("ProcessJsonAndLoad: json is empty");
            return;
        }

        // Parse main beatmap
        Beatmap parsed = null;
        try
        {
            parsed = JsonUtility.FromJson<Beatmap>(json);
        }
        catch (System.Exception ex)
        {
            Debug.LogError($"解析 Beatmap 失败: {ex}");
            return;
        }

        if (parsed == null)
        {
            Debug.LogError("解析 Beatmap 返回 null");
            return;
        }

        // Parse extras using BeatmapExtra which contains the requested fields and types
        BeatmapExtra extra = null;
        try
        {
            extra = JsonUtility.FromJson<BeatmapExtra>(json);
        }
        catch { extra = null; }

        if (extra != null)
        {
            // store into manager fields
            parsedTitle = extra.title;
            parsedComposer = extra.composer;
            parsedIllustrator = extra.illustrator;
            parsedCharter = extra.charter;
            parsedBeatmapId = extra.beatmapId;
            parsedDifficultyName = extra.difficultyName;
            parsedCreatedDate = extra.createdDate;
            parsedLastSavedTime = extra.lastSavedTime;
            parsedMusicFile = extra.musicFile;
            parsedBackgroundFile = extra.backgroundFile;

            parsedDuration = extra.duration;
            parsedBpm = extra.bpm;
            parsedDifficulty = extra.difficulty;
            parsedNoteAmount = extra.noteAmount;
            globalDelaySeconds = extra.globalDelaySeconds;

            // If JSON contains absolute paths for music/background, copy into parsed object for later use
            if (!string.IsNullOrEmpty(extra.musicFile)) parsed.musicFile = extra.musicFile;
            if (!string.IsNullOrEmpty(extra.backgroundFile)) parsed.backgroundFile = extra.backgroundFile;

            Debug.Log($"Beatmap extras parsed: title={parsedTitle}, composer={parsedComposer}, duration={parsedDuration}, bpm={parsedBpm}, difficulty={parsedDifficulty}, noteAmount={parsedNoteAmount}, globalDelaySeconds={globalDelaySeconds}");
        }
        else
        {
            // Fallback to populate from parsed Beatmap where possible
            parsedTitle = parsed.title;
            parsedComposer = parsed.composer;
            parsedIllustrator = parsed.illustrator;
            parsedCharter = parsed.charter;
            parsedBeatmapId = parsed.beatmapId;
            parsedDifficultyName = parsed.difficultyName;
            parsedCreatedDate = parsed.createdDate;
            parsedMusicFile = parsed.musicFile;
            parsedBackgroundFile = parsed.backgroundFile;

            // convert types
            parsedDuration = Mathf.RoundToInt(parsed.duration);
            parsedBpm = Mathf.RoundToInt(parsed.bpm);
            parsedDifficulty = parsed.difficulty;

            Debug.LogWarning("BeatmapExtra not found in JSON; populated limited fields from Beatmap.");
        }

        // NOTE: Do NOT modify parsed.notes here. globalDelaySeconds will be applied to audio playback instead.

        // assign and hand off to spawner
        beatmap = parsed;
        Debug.Log("谱面已加载：" + beatmap.title);
        noteSpawner.LoadBeatmap(beatmap);
    }
}