/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#pragma once

#include <memory>

#include <string_view>

#include <tools/stream.hxx>

#include <o3tl/typed_flags_set.hxx>

class SvStream;

// Global files (channel numbers 256 to 511) are not

// implemented at the moment.

constexpr sal_Int32 CHANNELS = 256;

enum class SbiStreamFlags

{

    NONE     = 0x0000,

    Input    = 0x0001,

    Output   = 0x0002,

    Random   = 0x0004,

    Append   = 0x0008,

    Binary   = 0x0010,

};

namespace o3tl

{

    template<> struct typed_flags<SbiStreamFlags> : is_typed_flags<SbiStreamFlags, 0x1f> {};

}

class SbiStream

{

    std::unique_ptr<SvStream> pStrm;

    sal_uInt64  nExpandOnWriteTo;  // during writing access expand the stream to this size

    OString aLine;

    sal_uInt64  nLine;

    short  nLen;                    // buffer length

    SbiStreamFlags  nMode;

    ErrCode nError;

    void   MapError();

public:

    SbiStream();

   ~SbiStream();

    ErrCode const & Open( const OUString&, StreamMode, SbiStreamFlags, short );

    ErrCode const & Close();

    ErrCode Read(OString&, sal_uInt16 = 0, bool bForceReadingPerByte=false);

    ErrCode const & Read( char& );

    ErrCode Write( const OString& );

    bool IsText() const     { return !bool(nMode & SbiStreamFlags::Binary); }

    bool IsRandom() const   { return bool(nMode & SbiStreamFlags::Random); }

    bool IsBinary() const   { return bool(nMode & SbiStreamFlags::Binary); }

    bool IsSeq() const      { return !bool(nMode & SbiStreamFlags::Random); }

    bool IsAppend() const   { return bool(nMode & SbiStreamFlags::Append); }

    short GetBlockLen() const          { return nLen;           }

    SbiStreamFlags GetMode() const              { return nMode;          }

    sal_uInt64 GetLine() const            { return nLine;          }

    void SetExpandOnWriteTo( sal_uInt64 n ) { nExpandOnWriteTo = n;    }

    void ExpandFile();

    SvStream* GetStrm()                { return pStrm.get();        }

};

class SbiIoSystem

{

    SbiStream* pChan[ CHANNELS ];

    OUString aPrompt;

    OString aIn;

    OUString aOut;

    short     nChan;

    ErrCode   nError;

    void      ReadCon(OString&);

    void      WriteCon(std::u16string_view);

public:

    SbiIoSystem();

   ~SbiIoSystem();

    ErrCode GetError();

    void  Shutdown();

    void  SetPrompt(const OUString& r) { aPrompt = r; }

    void  SetChannel( short n  )       { nChan = n;   }

    short GetChannel() const           { return nChan;}

    void  ResetChannel()               { nChan = 0;   }

    void  Open( short, const OUString&, StreamMode, SbiStreamFlags, short );

    void  Close();

    void  Read(OString&);

    char  Read();

    void  Write(std::u16string_view);

    // 0 == bad channel or no SvStream (nChannel=0..CHANNELS-1)

    SbiStream* GetStream( short nChannel ) const;

    void  CloseAll(); // JSM

};

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