BeatSaber-IPA-Reloaded/IPA/Patcher/BackupManager.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace IPA.Patcher
{
    public class BackupManager
    {
        public static BackupUnit FindLatestBackup(PatchContext context)
        {
            new DirectoryInfo(context.BackupPath).Create();
            return new DirectoryInfo(context.BackupPath)
                .GetDirectories()
                .OrderByDescending(p => p.Name)
                .Select(p => BackupUnit.FromDirectory(p, context))
                .FirstOrDefault();
        }

        public static bool HasBackup(PatchContext context)
        {
            return FindLatestBackup(context) != null;
        }
        
        public static bool Restore(PatchContext context)
        {
            var backup = FindLatestBackup(context);
            if(backup != null)
            {
                backup.Restore();
                backup.Delete();
                DeleteEmptyDirs(context.ProjectRoot);
                return true;
            }
            return false;
        }

        public static void DeleteEmptyDirs(string dir)
        {
            if (string.IsNullOrEmpty(dir))
                throw new ArgumentException(
                    "Starting directory is a null reference or an empty string",
                    "dir");

            try
            {
                foreach (var d in Directory.EnumerateDirectories(dir))
                {
                    DeleteEmptyDirs(d);
                }

                var entries = Directory.EnumerateFileSystemEntries(dir);

                if (!entries.Any())
                {
                    try
                    {
                        Directory.Delete(dir);
                    }
                    catch (UnauthorizedAccessException) { }
                    catch (DirectoryNotFoundException) { }
                }
            }
            catch (UnauthorizedAccessException) { }
        }

    }
}