/*
 *
 * (c) Copyright Ascensio System Limited 2010-2020
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL 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 more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/

namespace ASC.Data.Storage.Encryption;

[Singletone]
public class EncryptionWorker
{
    private readonly object _locker;
    private readonly FactoryOperation _factoryOperation;
    private readonly DistributedTaskQueue _queue;

    public EncryptionWorker(FactoryOperation factoryOperation, DistributedTaskQueueOptionsManager options)
    {
        _locker = new object();
        _factoryOperation = factoryOperation;
        _queue = options.Get<EncryptionOperation>();
    }

    public void Start(EncryptionSettingsProto encryptionSettings)
    {
        EncryptionOperation encryptionOperation;
        lock (_locker)
        {
            if (_queue.GetTask<EncryptionOperation>(GetCacheId()) != null)
            {
                return;
            }

            encryptionOperation = _factoryOperation.CreateOperation(encryptionSettings, GetCacheId());
            _queue.QueueTask(encryptionOperation);
        }
    }

    public void Stop()
    {
        _queue.CancelTask(GetCacheId());
    }

    public string GetCacheId()
    {
        return typeof(EncryptionOperation).FullName;
    }

    public double? GetEncryptionProgress()
    {
        var progress = _queue.GetTasks<EncryptionOperation>().FirstOrDefault();

        return progress.Percentage;
    }
}

[Singletone(Additional = typeof(FactoryOperationExtension))]
public class FactoryOperation
{
    private readonly IServiceProvider _serviceProvider;

    public FactoryOperation(IServiceProvider serviceProvider)
    {
        _serviceProvider = serviceProvider;
    }

    public EncryptionOperation CreateOperation(EncryptionSettingsProto encryptionSettings, string id)
    {
        var item = _serviceProvider.GetService<EncryptionOperation>();
        item.Init(encryptionSettings, id);

        return item;
    }
}

public class FactoryOperationExtension
{
    public static void Register(DIHelper dIHelper)
    {
        dIHelper.TryAdd<EncryptionOperation>();
        dIHelper.AddDistributedTaskQueueService<EncryptionOperation>(1);
    }
}