/*
 * (c) Copyright Ascensio System SIA 2010-2019
 *
 * 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 20A-12 Ernesta Birznieka-Upisha
 * street, Riga, Latvia, EU, LV-1050.
 *
 * 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
 *
 */
#pragma once

#include <iostream>
#include <list>
#include "sector.h"
#include "slist.h"
#include "svector.h"

namespace CFCPP
{
class StreamView : public IStream
{
public:
    StreamView(const SVector<Sector> &sectorChain, int sectorSize, Stream stream);
    StreamView(const SVector<Sector> &sectorChain, int sectorSize, std::streamsize length,
               SList<Sector> &availableSectors, Stream stream, bool isFatStream = false);


    std::streamsize tell() override;
    std::streamsize seek(std::streamsize offset, std::ios_base::seekdir mode = std::ios::beg) override;
    std::streamsize read(char *buffer, std::streamsize count) override;
    void write(const char *buffer, std::streamsize count) override;
    void flush() override {}
    void close() override;


    std::streamsize getPosition() const;
    void SetLength(std::streamsize value);
    std::streamsize getLength() const;
    SVector<Sector>& BaseSectorChain();

    int ReadInt32();
    void WriteInt32(int val);

private:
    void adjustLength(std::streamsize value);
    void adjustLength(std::streamsize value, SList<Sector> &availableSectors);

private:
    int sectorSize = 0;
    std::streamsize length = 0;

    SVector<Sector> sectorChain;
    bool isFatStream = false;
    int buf = 0;

    Stream stream;
    std::streamsize position = 0;
    SList<Sector> freeSectors;
};
}