// TortoiseSVN - a Windows shell extension for easy version control

// Copyright (C) 2007-2010, 2012, 2023 - TortoiseSVN

// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
//
#pragma once

#ifndef _WIN32
#    include <fstream>
#endif

#include "FileName.h"

/**
 * class that provides a simple, buffered file write stream.
 */
class CBufferedOutFile
{
private:
    // name (full path) of the file

    TFileName fileName;

#ifdef _WIN32
    // the file

    HANDLE file;
#else
    // fallback: STL stream

    std::ofstream stream;
#endif

    // our local buffer

    enum
    {
        BUFFER_SIZE = 1024 * 1024
    };

    std::unique_ptr<unsigned char[]> buffer;
    unsigned                         used;

    // physical file size + used

    size_t                           fileSize;

    // helper

    void                             InternalClose();

protected:
    // write buffer content to disk

    void Flush();

    // close and remove the file

    void RemoveFile();

public:
    // construction / destruction: auto- open/close

    CBufferedOutFile(const TFileName& fileName);
    virtual ~CBufferedOutFile();

    // write data to file

    void   Add(const unsigned char* data, unsigned bytes);
    void   Add(const char* data, unsigned bytes);
    void   Add(unsigned value);

    // file properties

    size_t GetFileSize() const;
    bool   IsOpen() const;
};

///////////////////////////////////////////////////////////////
// write data to file
///////////////////////////////////////////////////////////////

inline void CBufferedOutFile::Add(const char* data, unsigned bytes)
{
    Add(reinterpret_cast<const unsigned char*>(data), bytes);
}

inline void CBufferedOutFile::Add(unsigned value)
{
    Add(reinterpret_cast<unsigned char*>(&value), sizeof(value));
}

///////////////////////////////////////////////////////////////
// file properties
///////////////////////////////////////////////////////////////

inline size_t CBufferedOutFile::GetFileSize() const
{
    return fileSize;
}

inline bool CBufferedOutFile::IsOpen() const
{
#ifdef _WIN32
    return file != INVALID_HANDLE_VALUE;
#else
    return stream.is_open();
#endif
}

///////////////////////////////////////////////////////////////
// file stream operation
///////////////////////////////////////////////////////////////

CBufferedOutFile&        operator<<(CBufferedOutFile& dest, int value);

inline CBufferedOutFile& operator<<(CBufferedOutFile& dest, const char* value)
{
    dest.Add(value, static_cast<unsigned>(strlen(value)));
    return dest;
}

inline CBufferedOutFile& operator<<(CBufferedOutFile& dest, const std::string& value)
{
    dest.Add(value.c_str(), static_cast<unsigned>(value.length()));
    return dest;
}