// (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.Services;

[Singletone]
public class BackupCleanerTempFileService : BackgroundService
{
    private readonly string _tempFolder;
    private readonly ILogger<BackupCleanerTempFileService> _logger;

    public BackupCleanerTempFileService(ILogger<BackupCleanerTempFileService> logger, BackupWorker backupWorker)
    {
        _logger = logger;
        _tempFolder = backupWorker.TempFolder;
    }

    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        _logger.InfoBeginBackupCleaner();

        while (!stoppingToken.IsCancellationRequested)
        {
            var date = DateTime.UtcNow.AddDays(-7);
            var regex = new Regex(@"^\w*_\d{4}-\d{2}-\d{2}_\d{2}-\d{2}-\d{2}.tar.gz$");
            if (Directory.Exists(_tempFolder))
            {
                var files = Directory.EnumerateFiles(_tempFolder).Where(f => regex.IsMatch(Path.GetFileName(f)) && new FileInfo(f).LastWriteTimeUtc < date);
                foreach (var file in files)
                {
                    File.Delete(file);
                    _logger.InfoBackupCleanerDeleteFile(Path.GetFileName(file));
                }
            }
            await Task.Delay(TimeSpan.FromDays(1), stoppingToken);
        }

        _logger.InfoStopBackupCleaner();
    }
}