// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.Data.Backup;

public class ZipWriteOperator : IDataWriteOperator
{

    private readonly TarOutputStream _tarOutputStream;
    private readonly TempStream _tempStream;

    public ZipWriteOperator(TempStream tempStream, string targetFile)
    {
        var file = new FileStream(targetFile, FileMode.Create);
        var gZipOutputStream = new GZipOutputStream(file);
        _tarOutputStream = new TarOutputStream(gZipOutputStream, Encoding.UTF8);
        _tempStream = tempStream;
    }

    public void WriteEntry(string key, Stream stream)
    {
        using (var buffered = _tempStream.GetBuffered(stream))
        {
            var entry = TarEntry.CreateTarEntry(key);
            entry.Size = buffered.Length;
            _tarOutputStream.PutNextEntry(entry);
            buffered.Position = 0;
            buffered.CopyTo(_tarOutputStream);
            _tarOutputStream.CloseEntry();
        }
    }

    public void Dispose()
    {
        _tarOutputStream.Close();
        _tarOutputStream.Dispose();
    }
}

public class ZipReadOperator : IDataReadOperator
{
    private readonly string _tmpDir;

    public ZipReadOperator(string targetFile)
    {
        _tmpDir = Path.Combine(Path.GetDirectoryName(targetFile), Path.GetFileNameWithoutExtension(targetFile).Replace('>', '_').Replace(':', '_').Replace('?', '_'));

        using (var stream = File.OpenRead(targetFile))
        using (var reader = new GZipInputStream(stream))
        using (var tarOutputStream = TarArchive.CreateInputTarArchive(reader, Encoding.UTF8))
        {
            tarOutputStream.ExtractContents(_tmpDir);
        }

        File.Delete(targetFile);
    }

    public Stream GetEntry(string key)
    {
        var filePath = Path.Combine(_tmpDir, key);

        return File.Exists(filePath)
            ? File.Open(filePath, FileMode.Open, FileAccess.ReadWrite, FileShare.Read)
            : null;
    }

    public IEnumerable<string> GetEntries(string key)
    {
        var path = Path.Combine(_tmpDir, key);
        var files = Directory.EnumerateFiles(path);

        return files;
    }
    public IEnumerable<string> GetDirectories(string key)
    {
        var path = Path.Combine(_tmpDir, key);
        var files = Directory.EnumerateDirectories(path);
        return files;
    }

    public void Dispose()
    {
        if (Directory.Exists(_tmpDir))
        {
            Directory.Delete(_tmpDir, true);
        }
    }
}