// (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.Storage;

public class ProgressStream : Stream
{
    public override bool CanRead => _stream.CanRead;
    public override bool CanSeek => _stream.CanSeek;
    public override bool CanWrite => _stream.CanWrite;
    public override long Length => _length;
    public override long Position
    {
        get => _stream.Position;
        set => _stream.Position = value;
    }

    private readonly Stream _stream;
    private long _length = long.MaxValue;

    public ProgressStream(Stream stream)
    {
        _stream = stream ?? throw new ArgumentNullException(nameof(stream));

        try
        {
            _length = stream.Length;
        }
        catch (Exception) { }
    }

    public event Action<ProgressStream, int> OnReadProgress;

    public void InvokeOnReadProgress(int progress)
    {
        OnReadProgress?.Invoke(this, progress);
    }

    public override void Flush()
    {
        _stream.Flush();
    }

    public override long Seek(long offset, SeekOrigin origin)
    {
        return _stream.Seek(offset, origin);
    }

    public override void SetLength(long value)
    {
        _stream.SetLength(value);
        _length = value;
    }

    public override int Read(byte[] buffer, int offset, int count)
    {
        var readed = _stream.Read(buffer, offset, count);
        OnReadProgress(this, (int)(_stream.Position / (double)_length * 100));

        return readed;
    }

    public override void Write(byte[] buffer, int offset, int count)
    {
        _stream.Write(buffer, offset, count);
    }
}