namespace CVRManager.Services;

public static class FileOps
{
    public static void CopyTree(string src, string dst, Func<string, bool> skip, Action<string> log, CancellationToken ct)
    {
        Directory.CreateDirectory(dst);
        var count = 0;
        foreach (var entry in new DirectoryInfo(src).EnumerateFileSystemInfos())
        {
            ct.ThrowIfCancellationRequested();
            if (skip(entry.FullName)) continue;
            var target = Path.Combine(dst, entry.Name);
            if (entry is DirectoryInfo d)
            {
                if (d.Attributes.HasFlag(FileAttributes.ReparsePoint)) continue;
                CopyTree(d.FullName, target, skip, log, ct);
            }
            else
            {
                File.Copy(entry.FullName, target, true);
                if (++count % 200 == 0) log($"Copying {Path.GetFileName(src)}...");
            }
        }
    }

    public static void DeleteDirectorySafe(string path)
    {
        if (!Directory.Exists(path)) return;
        foreach (var d in new DirectoryInfo(path).EnumerateDirectories("*", SearchOption.AllDirectories).ToList())
            if (d.Exists && d.Attributes.HasFlag(FileAttributes.ReparsePoint)) d.Delete(false);
        Directory.Delete(path, true);
    }

    public static string Slug(string name)
    {
        var s = new string(name.Select(c => char.IsLetterOrDigit(c) ? c : '-').ToArray()).Trim('-');
        return s.Length == 0 ? "install" : s;
    }

    public static string FormatSize(long bytes) =>
        bytes >= 1L << 30 ? $"{bytes / (double)(1L << 30):0.0} GB" : $"{bytes / (double)(1L << 20):0} MB";
}