/* -*- 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 .

 */

#include <sal/config.h>

#include <com/sun/star/io/IOException.hpp>

#include <com/sun/star/io/NotConnectedException.hpp>

#include <com/sun/star/io/TempFile.hpp>

#include <com/sun/star/io/XOutputStream.hpp>

#include <com/sun/star/lang/IllegalArgumentException.hpp>

#include <comphelper/seekableinput.hxx>

#include <utility>

using namespace ::com::sun::star;

namespace comphelper

{

const sal_Int32 nConstBufferSize = 32000;

static void copyInputToOutput_Impl( const uno::Reference< io::XInputStream >& xIn,

                            const uno::Reference< io::XOutputStream >& xOut )

{

    sal_Int32 nRead;

    uno::Sequence< sal_Int8 > aSequence( nConstBufferSize );

    do

    {

        nRead = xIn->readBytes( aSequence, nConstBufferSize );

        if ( nRead < nConstBufferSize )

        {

            uno::Sequence< sal_Int8 > aTempBuf( aSequence.getConstArray(), nRead );

            xOut->writeBytes( aTempBuf );

        }

        else

            xOut->writeBytes( aSequence );

    }

    while ( nRead == nConstBufferSize );

}

OSeekableInputWrapper::OSeekableInputWrapper(

            uno::Reference< io::XInputStream > xInStream,

            uno::Reference< uno::XComponentContext > xContext )

: m_xContext(std::move( xContext ))

, m_xOriginalStream(std::move( xInStream ))

{

    if ( !m_xContext.is() )

        throw lang::IllegalArgumentException(u"no component context"_ustr, *this, 1);

}

OSeekableInputWrapper::~OSeekableInputWrapper()

{

}

uno::Reference< io::XInputStream > OSeekableInputWrapper::CheckSeekableCanWrap(

                            const uno::Reference< io::XInputStream >& xInStream,

                            const uno::Reference< uno::XComponentContext >& rxContext )

{

    // check that the stream is seekable and just wrap it if it is not

    uno::Reference< io::XSeekable > xSeek( xInStream, uno::UNO_QUERY );

    if ( xSeek.is() )

        return xInStream;

    return new OSeekableInputWrapper(xInStream, rxContext);

}

void OSeekableInputWrapper::PrepareCopy_Impl()

{

    if ( !m_xCopyInput.is() )

    {

        if ( !m_xContext.is() )

            throw uno::RuntimeException(u"no component context"_ustr);

        uno::Reference< io::XOutputStream > xTempOut(

                io::TempFile::create(m_xContext),

                uno::UNO_QUERY_THROW );

        copyInputToOutput_Impl( m_xOriginalStream, xTempOut );

        xTempOut->closeOutput();

        uno::Reference< io::XSeekable > xTempSeek( xTempOut, uno::UNO_QUERY );

        if ( xTempSeek.is() )

        {

            xTempSeek->seek( 0 );

            m_xCopyInput.set( xTempOut, uno::UNO_QUERY );

            if ( m_xCopyInput.is() )

            {

                m_xCopySeek = std::move(xTempSeek);

                m_pCopyByteReader = dynamic_cast<comphelper::ByteReader*>(xTempOut.get());

                assert(m_pCopyByteReader);

            }

        }

    }

    if ( !m_xCopyInput.is() )

        throw io::IOException(u"no m_xCopyInput"_ustr);

}

// XInputStream

sal_Int32 SAL_CALL OSeekableInputWrapper::readBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_xCopyInput->readBytes( aData, nBytesToRead );

}

sal_Int32 SAL_CALL OSeekableInputWrapper::readSomeBytes( uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_xCopyInput->readSomeBytes( aData, nMaxBytesToRead );

}

sal_Int32 OSeekableInputWrapper::readSomeBytes( sal_Int8* aData, sal_Int32 nMaxBytesToRead )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_pCopyByteReader->readSomeBytes( aData, nMaxBytesToRead );

}

void SAL_CALL OSeekableInputWrapper::skipBytes( sal_Int32 nBytesToSkip )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    m_xCopyInput->skipBytes( nBytesToSkip );

}

sal_Int32 SAL_CALL OSeekableInputWrapper::available()

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_xCopyInput->available();

}

void SAL_CALL OSeekableInputWrapper::closeInput()

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    m_xOriginalStream->closeInput();

    m_xOriginalStream.clear();

    if ( m_xCopyInput.is() )

    {

        m_xCopyInput->closeInput();

        m_xCopyInput.clear();

    }

    m_xCopySeek.clear();

    m_pCopyByteReader = nullptr;

}

// XSeekable

void SAL_CALL OSeekableInputWrapper::seek( sal_Int64 location )

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    m_xCopySeek->seek( location );

}

sal_Int64 SAL_CALL OSeekableInputWrapper::getPosition()

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_xCopySeek->getPosition();

}

sal_Int64 SAL_CALL OSeekableInputWrapper::getLength()

{

    std::scoped_lock aGuard( m_aMutex );

    if ( !m_xOriginalStream.is() )

        throw io::NotConnectedException();

    PrepareCopy_Impl();

    return m_xCopySeek->getLength();

}

}   // namespace comphelper

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