// (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.
//
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
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// 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.Feed.Aggregator.Service;

[Singletone]
public class FeedCleanerService : FeedBaseService
{
    protected override string LoggerName { get; set; } = "ASC.Feed.Cleaner";

    public FeedCleanerService(
        FeedSettings feedSettings,
        IServiceScopeFactory serviceScopeFactory,
        IOptionsMonitor<ILog> optionsMonitor)
        : base(feedSettings, serviceScopeFactory, optionsMonitor)
    {
    }
    
    protected override async Task ExecuteAsync(CancellationToken stoppingToken)
    {
        Logger.Info("Feed Cleaner Service running.");

        var cfg = FeedSettings;

        while (!stoppingToken.IsCancellationRequested)
        {
            await Task.Delay(cfg.RemovePeriod, stoppingToken);

            RemoveFeeds(cfg.AggregateInterval);
        }

        Logger.Info("Feed Cleaner Service stopping.");
    }

    private void RemoveFeeds(object interval)
    {
        try
        {
            using var scope = ServiceScopeFactory.CreateScope();
            var feedAggregateDataProvider = scope.ServiceProvider.GetService<FeedAggregateDataProvider>();

            Logger.DebugFormat("Start of removing old news");

            feedAggregateDataProvider.RemoveFeedAggregate(DateTime.UtcNow.Subtract((TimeSpan)interval));
        }
        catch (Exception ex)
        {
            Logger.Error(ex);
        }
    }
}