/* -*- 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 <string.h>
#include <vcl/svapp.hxx>
#include <vcl/weld.hxx>
#include <osl/diagnose.h>
#include <osl/file.hxx>

#include <runtime.hxx>

#include <rtl/strbuf.hxx>
#include <sal/log.hxx>

#include <comphelper/processfactory.hxx>
#include <comphelper/string.hxx>

#include <com/sun/star/uno/Sequence.hxx>
#include <com/sun/star/ucb/SimpleFileAccess.hpp>
#include <com/sun/star/ucb/UniversalContentBroker.hpp>
#include <com/sun/star/io/XInputStream.hpp>
#include <com/sun/star/io/XOutputStream.hpp>
#include <com/sun/star/io/XStream.hpp>
#include <com/sun/star/io/XSeekable.hpp>
#include <iosys.hxx>

using namespace com::sun::star::uno;
using namespace com::sun::star::ucb;
using namespace com::sun::star::io;


namespace {

class SbiInputDialog : public weld::GenericDialogController
{
    std::unique_ptr<weld::Entry> m_xInput;
    std::unique_ptr<weld::Button> m_xOk;
    std::unique_ptr<weld::Button> m_xCancel;
    std::unique_ptr<weld::Label> m_xPromptText;
    OUString m_aText;
    DECL_LINK(Ok, weld::Button&, void);
    DECL_LINK(Cancel, weld::Button&, void);
public:
    SbiInputDialog(weld::Window*, const OUString&);
    const OUString& GetInput() const { return m_aText; }
};

}

SbiInputDialog::SbiInputDialog(weld::Window* pParent, const OUString& rPrompt)
    : GenericDialogController(pParent, u"svt/ui/inputbox.ui"_ustr, u"InputBox"_ustr)
    , m_xInput(m_xBuilder->weld_entry(u"entry"_ustr))
    , m_xOk(m_xBuilder->weld_button(u"ok"_ustr))
    , m_xCancel(m_xBuilder->weld_button(u"cancel"_ustr))
    , m_xPromptText(m_xBuilder->weld_label(u"prompt"_ustr))
{
    m_xDialog->set_title(rPrompt);
    m_xPromptText->set_label(rPrompt);
    m_xOk->connect_clicked( LINK( this, SbiInputDialog, Ok ) );
    m_xCancel->connect_clicked( LINK( this, SbiInputDialog, Cancel ) );
}

IMPL_LINK_NOARG( SbiInputDialog, Ok, weld::Button&, void )
{
    m_aText = m_xInput->get_text();
    m_xDialog->response(RET_OK);
}

IMPL_LINK_NOARG( SbiInputDialog, Cancel, weld::Button&, void )
{
    m_xDialog->response(RET_CANCEL);
}

SbiStream::SbiStream()
    : nExpandOnWriteTo(0)
    , nLine(0)
    , nLen(0)
    , nMode(SbiStreamFlags::NONE)
    , nError(0)
{
}

SbiStream::~SbiStream()
{
}

// map an SvStream-error to StarBASIC-code

void SbiStream::MapError()
{
    if( !pStrm )
        return;

    ErrCode nEC = pStrm->GetError();
    if (nEC == ERRCODE_NONE)
        nError = ERRCODE_NONE;
    else if (nEC == SVSTREAM_FILE_NOT_FOUND)
        nError = ERRCODE_BASIC_FILE_NOT_FOUND;
    else if (nEC ==SVSTREAM_PATH_NOT_FOUND)
        nError = ERRCODE_BASIC_PATH_NOT_FOUND;
    else if (nEC ==SVSTREAM_TOO_MANY_OPEN_FILES)
        nError = ERRCODE_BASIC_TOO_MANY_FILES;
    else if (nEC ==SVSTREAM_ACCESS_DENIED)
        nError = ERRCODE_BASIC_ACCESS_DENIED;
    else if (nEC ==SVSTREAM_INVALID_PARAMETER)
        nError = ERRCODE_BASIC_BAD_ARGUMENT;
    else if (nEC ==SVSTREAM_OUTOFMEMORY)
        nError = ERRCODE_BASIC_NO_MEMORY;
    else
        nError = ERRCODE_BASIC_IO_ERROR;
}

// Returns sal_True if UNO is available, otherwise the old file
// system implementation has to be used
// #89378 New semantic: Don't just ask for UNO but for UCB
bool hasUno()
{
    static const bool bRetVal = [] {
        const Reference< XComponentContext >& xContext = comphelper::getProcessComponentContext();
        if( !xContext.is() )
        {
            // No service manager at all
            return false;
        }
        else
        {
            Reference< XUniversalContentBroker > xManager = UniversalContentBroker::create(xContext);

            if ( !( xManager->queryContentProvider( u"file:///"_ustr ).is() ) )
            {
                // No UCB
                return false;
            }
        }
        return true;
    }();
    return bRetVal;
}

namespace {

class OslStream : public SvStream
{
    osl::File maFile;

public:
                        OslStream( const OUString& rName, StreamMode nStrmMode );
                       virtual ~OslStream() override;
    virtual std::size_t GetData(void* pData, std::size_t nSize) override;
    virtual std::size_t PutData(const void* pData, std::size_t nSize) override;
    virtual sal_uInt64 SeekPos( sal_uInt64 nPos ) override;
    virtual void        FlushData() override;
    virtual void        SetSize( sal_uInt64 nSize) override;
};

}

OslStream::OslStream( const OUString& rName, StreamMode nStrmMode )
    : maFile( rName )
{
    sal_uInt32 nFlags;

    if( (nStrmMode & (StreamMode::READ | StreamMode::WRITE)) == (StreamMode::READ | StreamMode::WRITE) )
    {
        nFlags = osl_File_OpenFlag_Read | osl_File_OpenFlag_Write;
    }
    else if( nStrmMode & StreamMode::WRITE )
    {
        nFlags = osl_File_OpenFlag_Write;
    }
    else //if( nStrmMode & StreamMode::READ )
    {
        nFlags = osl_File_OpenFlag_Read;
    }

    osl::FileBase::RC nRet = maFile.open( nFlags );
    if( nRet == osl::FileBase::E_NOENT && nFlags != osl_File_OpenFlag_Read )
    {
        nFlags |= osl_File_OpenFlag_Create;
        nRet = maFile.open( nFlags );
    }

    if( nRet != osl::FileBase::E_None )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
}


OslStream::~OslStream()
{
    maFile.close();
}

std::size_t OslStream::GetData(void* pData, std::size_t nSize)
{
    sal_uInt64 nBytesRead = nSize;
    maFile.read( pData, nBytesRead, nBytesRead );
    return nBytesRead;
}

std::size_t OslStream::PutData(const void* pData, std::size_t nSize)
{
    sal_uInt64 nBytesWritten;
    maFile.write( pData, nSize, nBytesWritten );
    return nBytesWritten;
}

sal_uInt64 OslStream::SeekPos( sal_uInt64 nPos )
{
    ::osl::FileBase::RC rc = ::osl::FileBase::E_None;
    // check if a truncated STREAM_SEEK_TO_END was passed
    assert(nPos != SAL_MAX_UINT32);
    if( nPos == STREAM_SEEK_TO_END )
    {
        rc = maFile.setPos( osl_Pos_End, 0 );
    }
    else
    {
        rc = maFile.setPos( osl_Pos_Absolut, nPos );
    }
    OSL_VERIFY(rc == ::osl::FileBase::E_None);
    sal_uInt64 nRealPos(0);
    rc = maFile.getPos( nRealPos );
    OSL_VERIFY(rc == ::osl::FileBase::E_None);
    return nRealPos;
}

void OslStream::FlushData()
{
}

void OslStream::SetSize( sal_uInt64 nSize )
{
    maFile.setSize( nSize );
}

namespace {

class UCBStream : public SvStream
{
    Reference< XInputStream >   xIS;
    Reference< XStream >        xS;
    Reference< XSeekable >      xSeek;
public:
    explicit UCBStream( Reference< XInputStream > const & xIS );
    explicit UCBStream( Reference< XStream > const & xS );
                       virtual ~UCBStream() override;
    virtual std::size_t GetData( void* pData, std::size_t nSize ) override;
    virtual std::size_t PutData( const void* pData, std::size_t nSize ) override;
    virtual sal_uInt64 SeekPos( sal_uInt64 nPos ) override;
    virtual void        FlushData() override;
    virtual void        SetSize( sal_uInt64 nSize ) override;
};

}

UCBStream::UCBStream( Reference< XInputStream > const & rStm )
    : xIS( rStm )
    , xSeek( rStm, UNO_QUERY )
{
}

UCBStream::UCBStream( Reference< XStream > const & rStm )
    : xS( rStm )
    , xSeek( rStm, UNO_QUERY )
{
}


UCBStream::~UCBStream()
{
    try
    {
        if( xIS.is() )
        {
            xIS->closeInput();
        }
        else if( xS.is() )
        {
            Reference< XInputStream > xIS_ = xS->getInputStream();
            if( xIS_.is() )
            {
                xIS_->closeInput();
            }
        }
    }
    catch(const Exception & )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
}

std::size_t UCBStream::GetData(void* pData, std::size_t nSize)
{
    try
    {
        Reference< XInputStream > xISFromS;
        if( xIS.is() )
        {
            Sequence<sal_Int8> aData;
            nSize = xIS->readBytes( aData, nSize );
            memcpy( pData, aData.getConstArray(), nSize );
            return nSize;
        }
        else if( xS.is() && (xISFromS = xS->getInputStream()).is() )
        {
            Sequence<sal_Int8> aData;
            nSize = xISFromS->readBytes( aData, nSize );
            memcpy(pData, aData.getConstArray(), nSize );
            return nSize;
        }
        else
        {
            SetError( ERRCODE_IO_GENERAL );
        }
    }
    catch(const Exception & )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
    return 0;
}

std::size_t UCBStream::PutData(const void* pData, std::size_t nSize)
{
    try
    {
        Reference< XOutputStream > xOSFromS;
        if( xS.is() && (xOSFromS = xS->getOutputStream()).is() )
        {
            Sequence<sal_Int8> aData( static_cast<const sal_Int8 *>(pData), nSize );
            xOSFromS->writeBytes( aData );
            return nSize;
        }
        else
        {
            SetError( ERRCODE_IO_GENERAL );
        }
    }
    catch(const Exception & )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
    return 0;
}

sal_uInt64 UCBStream::SeekPos( sal_uInt64 nPos )
{
    try
    {
        if( xSeek.is() )
        {
            sal_uInt64 nLen = static_cast<sal_uInt64>( xSeek->getLength() );
            if( nPos > nLen )
            {
                nPos = nLen;
            }
            xSeek->seek( nPos );
            return nPos;
        }
        else
        {
            SetError( ERRCODE_IO_GENERAL );
        }
    }
    catch(const Exception & )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
    return 0;
}

void UCBStream::FlushData()
{
    try
    {
        Reference< XOutputStream > xOSFromS;
        if( xS.is() && (xOSFromS = xS->getOutputStream()).is() )
        {
            xOSFromS->flush();
        }
        else
        {
            SetError( ERRCODE_IO_GENERAL );
        }
    }
    catch(const Exception & )
    {
        SetError( ERRCODE_IO_GENERAL );
    }
}

void    UCBStream::SetSize( sal_uInt64 )
{
    SAL_WARN("basic", "UCBStream::SetSize not allowed to call from basic" );
    SetError( ERRCODE_IO_GENERAL );
}


ErrCode const & SbiStream::Open
( std::string_view rName, StreamMode nStrmMode, SbiStreamFlags nFlags, short nL )
{
    nMode   = nFlags;
    nLen    = nL;
    nLine   = 0;
    nExpandOnWriteTo = 0;
    if( ( nStrmMode & ( StreamMode::READ|StreamMode::WRITE ) ) == StreamMode::READ )
    {
        nStrmMode |= StreamMode::NOCREATE;
    }
    OUString aStr(OStringToOUString(rName, osl_getThreadTextEncoding()));
    OUString aNameStr = getFullPath( aStr );

    if( hasUno() )
    {
        Reference< XSimpleFileAccess3 > xSFI( SimpleFileAccess::create( comphelper::getProcessComponentContext() ) );
        try
        {

        // #??? For write access delete file if it already exists (not for appending)
        if( (nStrmMode & StreamMode::WRITE) && !IsAppend() && !IsBinary() && !IsRandom() &&
            xSFI->exists( aNameStr ) && !xSFI->isFolder( aNameStr ) )
        {
            xSFI->kill( aNameStr );
        }

        if( (nStrmMode & (StreamMode::READ | StreamMode::WRITE)) == (StreamMode::READ | StreamMode::WRITE) )
        {
            Reference< XStream > xIS = xSFI->openFileReadWrite( aNameStr );
            pStrm.reset( new UCBStream( xIS ) );
        }
        else if( nStrmMode & StreamMode::WRITE )
        {
            Reference< XStream > xIS = xSFI->openFileReadWrite( aNameStr );
            pStrm.reset( new UCBStream( xIS ) );
        }
        else //if( nStrmMode & StreamMode::READ )
        {
            Reference< XInputStream > xIS = xSFI->openFileRead( aNameStr );
            pStrm.reset( new UCBStream( xIS ) );
        }

        }
        catch(const Exception & )
        {
            nError = ERRCODE_IO_GENERAL;
        }
    }

    if( !pStrm )
    {
        pStrm.reset( new OslStream( aNameStr, nStrmMode ) );
    }
    if( IsAppend() )
    {
        pStrm->Seek( STREAM_SEEK_TO_END );
    }
    MapError();
    if( nError )
    {
        pStrm.reset();
    }
    return nError;
}

ErrCode const & SbiStream::Close()
{
    if( pStrm )
    {
        MapError();
        pStrm.reset();
    }
    return nError;
}

ErrCode SbiStream::Read(OString& rBuf, sal_uInt16 n, bool bForceReadingPerByte)
{
    nExpandOnWriteTo = 0;
    if( !bForceReadingPerByte && IsText() )
    {
        pStrm->ReadLine(rBuf);
        nLine++;
    }
    else
    {
        if( !n )
        {
            n = nLen;
        }
        if( !n )
        {
            return nError = ERRCODE_BASIC_BAD_RECORD_LENGTH;
        }
        OStringBuffer aBuffer(read_uInt8s_ToOString(*pStrm, n));
        //Pad it out with ' ' to the requested length on short read
        sal_Int32 nRequested = sal::static_int_cast<sal_Int32>(n);
        comphelper::string::padToLength(aBuffer, nRequested, ' ');
        rBuf = aBuffer.makeStringAndClear();
    }
    MapError();
    if( !nError && pStrm->eof() )
    {
        nError = ERRCODE_BASIC_READ_PAST_EOF;
    }
    return nError;
}

ErrCode const & SbiStream::Read( char& ch )
{
    nExpandOnWriteTo = 0;
    if (aLine.isEmpty())
    {
        Read( aLine );
        aLine += "\n";
    }
    ch = aLine[0];
    aLine = aLine.copy(1);
    return nError;
}

void SbiStream::ExpandFile()
{
    if ( !nExpandOnWriteTo )
        return;

    sal_uInt64 nCur = pStrm->Seek(STREAM_SEEK_TO_END);
    if( nCur < nExpandOnWriteTo )
    {
        sal_uInt64 nDiff = nExpandOnWriteTo - nCur;
        while( nDiff-- )
        {
            pStrm->WriteChar( 0 );
        }
    }
    else
    {
        pStrm->Seek( nExpandOnWriteTo );
    }
    nExpandOnWriteTo = 0;
}

namespace
{
    void WriteLines(SvStream &rStream, const OString& rStr)
    {
        OString aStr(convertLineEnd(rStr, rStream.GetLineDelimiter()) );
        rStream.WriteBytes(aStr.getStr(), aStr.getLength());
        endl( rStream );
    }
}

ErrCode SbiStream::Write( const OString& rBuf )
{
    ExpandFile();
    if( IsAppend() )
    {
        pStrm->Seek( STREAM_SEEK_TO_END );
    }
    if( IsText() )
    {
        aLine += rBuf;
        // Get it out, if the end is an LF, but strip CRLF before,
        // because the SvStream adds a CRLF!
        sal_Int32 nLineLen = aLine.getLength();
        if (nLineLen && aLine[--nLineLen] == 0x0A)
        {
            aLine = aLine.copy(0, nLineLen);
            if (nLineLen && aLine[--nLineLen] == 0x0D)
            {
                aLine = aLine.copy(0, nLineLen);
            }
            WriteLines(*pStrm, aLine);
            aLine.clear();
        }
    }
    else
    {
        if( !nLen )
        {
            return nError = ERRCODE_BASIC_BAD_RECORD_LENGTH;
        }
        pStrm->WriteBytes(rBuf.getStr(), nLen);
        MapError();
    }
    return nError;
}


SbiIoSystem::SbiIoSystem()
{
    for(SbiStream* & i : pChan)
    {
        i = nullptr;
    }
    nChan  = 0;
    nError = ERRCODE_NONE;
}

SbiIoSystem::~SbiIoSystem() COVERITY_NOEXCEPT_FALSE
{
    Shutdown();
}

ErrCode SbiIoSystem::GetError()
{
    ErrCode n = nError;
    nError = ERRCODE_NONE;
    return n;
}

void SbiIoSystem::Open(short nCh, std::string_view rName, StreamMode nMode, SbiStreamFlags nFlags, short nLen)
{
    nError = ERRCODE_NONE;
    if( nCh >= CHANNELS || !nCh )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else if( pChan[ nCh ] )
    {
        nError = ERRCODE_BASIC_FILE_ALREADY_OPEN;
    }
    else
    {
       pChan[ nCh ] = new SbiStream;
       nError = pChan[ nCh ]->Open( rName, nMode, nFlags, nLen );
       if( nError )
       {
            delete pChan[ nCh ];
            pChan[ nCh ] = nullptr;
       }
    }
    nChan = 0;
}


void SbiIoSystem::Close()
{
    if( !nChan )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else if( !pChan[ nChan ] )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else
    {
        nError = pChan[ nChan ]->Close();
        delete pChan[ nChan ];
        pChan[ nChan ] = nullptr;
    }
    nChan = 0;
}


void SbiIoSystem::Shutdown()
{
    for( short i = 1; i < CHANNELS; i++ )
    {
        if( pChan[ i ] )
        {
            ErrCode n = pChan[ i ]->Close();
            delete pChan[ i ];
            pChan[ i ] = nullptr;
            if( n && !nError )
            {
                nError = n;
            }
        }
    }
    nChan = 0;
    // anything left to PRINT?
    if( !aOut.isEmpty() )
    {
        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(Application::GetDefDialogParent(), VclMessageType::Warning,
            VclButtonsType::Ok, aOut));
        xBox->run();
    }
    aOut.clear();
}


void SbiIoSystem::Read(OString& rBuf)
{
    if( !nChan )
    {
        ReadCon( rBuf );
    }
    else if( !pChan[ nChan ] )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else
    {
        nError = pChan[ nChan ]->Read( rBuf );
    }
}

char SbiIoSystem::Read()
{
    char ch = ' ';
    if( !nChan )
    {
        if( aIn.isEmpty() )
        {
            ReadCon( aIn );
            aIn += "\n";
        }
        ch = aIn[0];
        aIn = aIn.copy(1);
    }
    else if( !pChan[ nChan ] )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else
    {
        nError = pChan[ nChan ]->Read( ch );
    }
    return ch;
}

void SbiIoSystem::Write(std::u16string_view rBuf)
{
    if( !nChan )
    {
        WriteCon( rBuf );
    }
    else if( !pChan[ nChan ] )
    {
        nError = ERRCODE_BASIC_BAD_CHANNEL;
    }
    else
    {
        nError = pChan[ nChan ]->Write( OUStringToOString(rBuf, osl_getThreadTextEncoding()) );
    }
}

// nChannel == 0..CHANNELS-1

SbiStream* SbiIoSystem::GetStream( short nChannel ) const
{
    SbiStream* pRet = nullptr;
    if( nChannel >= 0 && nChannel < CHANNELS )
    {
        pRet = pChan[ nChannel ];
    }
    return pRet;
}

void SbiIoSystem::CloseAll()
{
    for( short i = 1; i < CHANNELS; i++ )
    {
        if( pChan[ i ] )
        {
            ErrCode n = pChan[ i ]->Close();
            delete pChan[ i ];
            pChan[ i ] = nullptr;
            if( n && !nError )
            {
                nError = n;
            }
        }
    }
}

void SbiIoSystem::ReadCon(OString& rIn)
{
    OUString aPromptStr(OStringToOUString(aPrompt, osl_getThreadTextEncoding()));
    SbiInputDialog aDlg(nullptr, aPromptStr);
    if (aDlg.run() == RET_OK)
    {
        rIn = OUStringToOString(aDlg.GetInput(), osl_getThreadTextEncoding());
    }
    else
    {
        nError = ERRCODE_BASIC_USER_ABORT;
    }
    aPrompt.clear();
}

// output of a MessageBox, if there's a CR in the console-buffer

void SbiIoSystem::WriteCon(std::u16string_view rText)
{
    aOut += rText;
    sal_Int32 n1 = aOut.indexOf('\n');
    sal_Int32 n2 = aOut.indexOf('\r');
    if( n1 == -1 && n2 == -1 )
        return;

    if( n1 == -1 )
    {
        n1 = n2;
    }
    else if( n2 == -1 )
    {
        n2 = n1;
    }
    if( n1 > n2 )
    {
        n1 = n2;
    }
    OUString s(aOut.copy(0, n1));
    aOut = aOut.copy(n1);
    while ( !aOut.isEmpty() && (aOut[0] == '\n' || aOut[0] == '\r') )
    {
        aOut = aOut.copy(1);
    }
    {
        SolarMutexGuard aSolarGuard;

        std::unique_ptr<weld::MessageDialog> xBox(Application::CreateMessageDialog(Application::GetDefDialogParent(), VclMessageType::Warning,
            VclButtonsType::OkCancel, s));
        xBox->set_default_response(RET_OK);
        if (!xBox->run())
        {
            nError = ERRCODE_BASIC_USER_ABORT;
        }
    }
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
