using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading.Tasks;

namespace ndview
{
    public sealed class TempDirectory : IDisposable
    {
        public DirectoryInfo Directory { get; }
        public TempDirectory(DirectoryInfo location)
        {
            Directory = new DirectoryInfo(Path.Combine(location.FullName, TempFile.GenerateLocation()));
            Directory.Create();
        }
        public TempDirectory() : this(new DirectoryInfo(TempFile.TempFileLocation)) { }

        public void Dispose()
        {
            Directory.Delete(true);
        }
    }
    public sealed class TempFile : IDisposable, IAsyncDisposable
    {
        public static string GenerateLocation()
        {
            var time = DateTime.Now;
            return $"{time.Year}-{time.Month}-{time.Day}-{time.Hour}.{time.Minute}.{time.Second}.{time.Millisecond}-{Guid.NewGuid().ToString()}";
        }

        public void Dispose()
        {
            if (File.Exists)
            {
                Stream.Dispose();
                File.Delete();
            }
        }

        public async ValueTask DisposeAsync()
        {
            if (File.Exists)
            {
                await Stream.DisposeAsync();
                File.Delete();
            }
        }

        ~TempFile()
        {
            if (File.Exists)
            {
                try { File.Delete(); } catch { }
            }
        }

        public static string TempFileLocation { get; set; }
        static TempFile()
        {
            TempFileLocation = Directory.CreateDirectory(Path.Combine(Path.GetTempPath(), GenerateLocation())).FullName;

            AppDomain.CurrentDomain.DomainUnload += (o, e) =>
            {
                try
                {
                    foreach (var file in new DirectoryInfo(TempFileLocation).GetFiles()) try
                        {
                            file.Delete();
                        }
                        catch { }
                    Directory.Delete(TempFileLocation, true);
                }
                catch { }
            };
        }
        private FileInfo File { get; }
        public Stream Stream { get; }
        public TempFile(DirectoryInfo location)
        {
            var nam = Path.Combine(location.FullName, GenerateLocation() + ".tmp");
            File = new FileInfo(nam);
            Stream = new FileStream(nam, FileMode.Create);
        }
        public TempFile() : this(new DirectoryInfo(TempFileLocation)) { }
    }
}