using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Intromat.Helpers
{
    public static class IOHelper
    {
        public static string GetRelativePath(string basePath, string fullPath)
        {
            if (string.IsNullOrEmpty(basePath))
                return fullPath ?? "";

            if (string.IsNullOrEmpty(fullPath))
                return "";

            if (basePath.Last() != '\\')
                basePath += "\\";

            var builder = new StringBuilder(4096);
            _ = PathRelativePathTo(builder, basePath, 0, fullPath, 0);
            return builder.ToString()[2..];
        }


        [DllImport("shlwapi.dll", EntryPoint = "PathRelativePathTo", CharSet = CharSet.Unicode)]
        private static extern bool PathRelativePathTo(StringBuilder lpszDst, string from, uint attrFrom, string to, uint attrTo);
    }
}