using UnityEngine;
using System.IO;
using System;

public static class PathUtils
{
    // 核心方法：获取相对路径（自动处理路径格式）
    public static string GetRelativeToStreamingAssets(string targetPath, bool allowOutside = false)
    {
        string streamingAssetsPath = Application.streamingAssetsPath;
#if UNITY_EDITOR
            streamingAssetsPath = "E:\\HQB\\文件打包\\0402\\10002\\App_Data\\StreamingAssets";
#endif
        // 规范化路径格式（统一斜杠和大小写）
        string normalizedBase = NormalizePath(streamingAssetsPath);
        string normalizedTarget = NormalizePath(targetPath);

        // 检查是否在StreamingAssets目录下
        bool isInside = normalizedTarget.StartsWith(normalizedBase, StringComparison.OrdinalIgnoreCase);

        if (isInside)
        {
            // 直接截取子路径
            return normalizedTarget.Substring(normalizedBase.Length + 1);
        }
        else if (allowOutside)
        {
            // 使用Uri计算可能包含上级目录的相对路径
            return GetRelativePathUsingUri(normalizedBase, normalizedTarget);
        }
        else
        {
            Debug.LogError($"路径不在StreamingAssets下: {targetPath}");
            return null;
        }
    }

    // 路径规范化工具
    private static string NormalizePath(string path)
    {
        return Path.GetFullPath(path)
                  .Replace('\\', '/')
                  .TrimEnd('/')
                  .ToLower(); // 根据平台需求调整大小写敏感
    }

    // 使用Uri计算相对路径（支持跨目录）
    private static string GetRelativePathUsingUri(string basePath, string targetPath)
    {
        var baseUri = new Uri(basePath + "/");
        var targetUri = new Uri(targetPath);

        Uri relativeUri = baseUri.MakeRelativeUri(targetUri);
        string relativePath = Uri.UnescapeDataString(relativeUri.ToString())
                                 .Replace('/', Path.DirectorySeparatorChar);

        return relativePath;
    }
}