using System.Collections;
using System.Collections.Generic;
using System.IO;
using UnityEngine;
using UnityEngine.Networking;

public static class LocalAudioLoader
{
    /// <summary>
    /// 加载文件夹下所有音频文件
    /// </summary>
    /// <param name="folderPath">音频文件夹完整路径</param>
    /// <param name="onComplete">加载完成回调</param>
    public static IEnumerator LoadAudios(
        string folderPath,
        System.Action<List<AudioClip>> onComplete)
    {
        List<AudioClip> clips = new List<AudioClip>();

        if (!Directory.Exists(folderPath))
        {
            Debug.LogError($"[LocalAudioLoader] 文件夹不存在: {folderPath}");
            onComplete?.Invoke(clips);
            yield break;
        }

        string[] files = Directory.GetFiles(folderPath);

        foreach (string file in files)
        {
            if (!IsAudioFile(file))
                continue;

            string url = "file://" + file;

            using (UnityWebRequest request =
                   UnityWebRequestMultimedia.GetAudioClip(url, GetAudioType(file)))
            {
                yield return request.SendWebRequest();

                if (request.result != UnityWebRequest.Result.Success)
                {
                    Debug.LogError($"音频加载失败: {file}\n{request.error}");
                    continue;
                }

                AudioClip clip = DownloadHandlerAudioClip.GetContent(request);
                clip.name = Path.GetFileNameWithoutExtension(file);
                clips.Add(clip);
            }
        }

        onComplete?.Invoke(clips);
    }

    /// <summary>
    /// 加载单个本地音频文件
    /// </summary>
    /// <param name="filePath">音频完整路径</param>
    /// <param name="onComplete">加载完成回调</param>
    public static IEnumerator LoadAudio(
        string filePath,
        System.Action<AudioClip> onComplete)
    {
        if (!File.Exists(filePath))
        {
            Debug.LogError($"[LocalAudioLoader] 音频不存在: {filePath}");
            onComplete?.Invoke(null);
            yield break;
        }

        if (!IsAudioFile(filePath))
        {
            Debug.LogError($"[LocalAudioLoader] 非音频格式: {filePath}");
            onComplete?.Invoke(null);
            yield break;
        }

        string url = "file://" + filePath;

        using (UnityWebRequest request =
               UnityWebRequestMultimedia.GetAudioClip(url, GetAudioType(filePath)))
        {
            yield return request.SendWebRequest();

            if (request.result != UnityWebRequest.Result.Success)
            {
                Debug.LogError($"音频加载失败: {filePath}\n{request.error}");
                onComplete?.Invoke(null);
                yield break;
            }

            AudioClip clip = DownloadHandlerAudioClip.GetContent(request);
            clip.name = Path.GetFileNameWithoutExtension(filePath);
            onComplete?.Invoke(clip);
        }
    }

    private static bool IsAudioFile(string path)
    {
        string ext = Path.GetExtension(path).ToLower();
        return ext == ".wav" || ext == ".ogg" || ext == ".mp3";
    }

    private static AudioType GetAudioType(string path)
    {
        string ext = Path.GetExtension(path).ToLower();

        switch (ext)
        {
            case ".wav": return AudioType.WAV;
            case ".ogg": return AudioType.OGGVORBIS;
            case ".mp3": return AudioType.MPEG;
            default: return AudioType.UNKNOWN;
        }
    }
}