using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

public static class AssetUtils
{
    private static readonly MD5 _md5 = MD5.Create();

    private static readonly char[] _seperateChars = {'/', '\\'};

    /// <summary>
    ///     Unity文件路径向上一级，可用于取得文件路径
    /// </summary>
    public static string MoveUp(this string path)
    {
        path = path.TrimEnd(_seperateChars);
        var index = path.LastIndexOfAny(_seperateChars);
        path = index >= 0 ? path.Remove(index) : string.Empty;
        return path;
    }

    /// <summary>
    ///     Unity文件路径到下一级
    /// </summary>
    public static string Open(this string path, string next)
    {
        return string.IsNullOrEmpty(next) ? path : path.TrimEnd(_seperateChars) + "/" + next;
    }

    /// <summary>
    ///     路径转化为超链接路径（Unity资源路径）格式
    /// </summary>
    public static string ToUrl(this string path)
    {
        return path.Replace("\\", "/");
    }

    public static string GetFileMd5(string filePath)
    {
        return GetMd5FromBytes(File.ReadAllBytes(filePath));
    }

    public static string GetTextMd5(string text)
    {
        return GetMd5FromBytes(Encoding.UTF8.GetBytes(text));
    }

    private static string GetMd5FromBytes(byte[] bytes)
    {
        return string.Concat(_md5.ComputeHash(bytes).Select(x => x.ToString("x2")).ToArray()).ToLower();
    }

    public static string[] TextToLines(string text)
    {
        return Regex.Split(text, "\\r\\n|\\r|\\n");
    }
}