/* -*- 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 <comphelper/processfactory.hxx>

#include <osl/file.hxx>

#include <osl/thread.h>

#include <unotools/ucbstreamhelper.hxx>

#include <ucbhelper/content.hxx>

#include <unotools/datetime.hxx>

#include <svx/svdotext.hxx>

#include <svx/svdmodel.hxx>

#include <editeng/editdata.hxx>

#include <sfx2/lnkbase.hxx>

#include <sfx2/linkmgr.hxx>

#include <tools/urlobj.hxx>

#include <tools/debug.hxx>

#include <tools/tenccvt.hxx>

#include <memory>

class ImpSdrObjTextLink: public ::sfx2::SvBaseLink

{

    SdrTextObj*                 pSdrObj;

public:

    explicit ImpSdrObjTextLink( SdrTextObj* pObj1 )

        : ::sfx2::SvBaseLink( ::SfxLinkUpdateMode::ONCALL, SotClipboardFormatId::SIMPLE_FILE ),

            pSdrObj( pObj1 )

    {}

    virtual void Closed() override;

    virtual ::sfx2::SvBaseLink::UpdateResult DataChanged(

        const OUString& rMimeType, const css::uno::Any & rValue ) override;

};

void ImpSdrObjTextLink::Closed()

{

    if (pSdrObj )

    {

        // set pLink of the object to NULL, because we are destroying the link instance now

        ImpSdrObjTextLinkUserData* pData=pSdrObj->GetLinkUserData();

        if (pData!=nullptr) pData->mpLink = nullptr;

        pSdrObj->ReleaseTextLink();

    }

    SvBaseLink::Closed();

}

::sfx2::SvBaseLink::UpdateResult ImpSdrObjTextLink::DataChanged(

    const OUString& /*rMimeType*/, const css::uno::Any & /*rValue */)

{

    bool bForceReload = false;

    SdrModel* pModel(pSdrObj ? &pSdrObj->getSdrModelFromSdrObject() : nullptr);

    sfx2::LinkManager* pLinkManager(pModel ? pModel->GetLinkManager() : nullptr);

    if( pLinkManager )

    {

        ImpSdrObjTextLinkUserData* pData=pSdrObj->GetLinkUserData();

        if( pData )

        {

            OUString aFile;

            OUString aFilter;

            sfx2::LinkManager::GetDisplayNames( this, nullptr,&aFile, nullptr, &aFilter );

            if( pData->maFileName != aFile ||

                pData->maFilterName != aFilter )

            {

                pData->maFileName = aFile;

                pData->maFilterName = aFilter;

                pSdrObj->SetChanged();

                bForceReload = true;

            }

        }

    }

    if (pSdrObj )

        pSdrObj->ReloadLinkedText( bForceReload );

    return SUCCESS;

}

ImpSdrObjTextLinkUserData::ImpSdrObjTextLinkUserData():

    SdrObjUserData(SdrInventor::Default,SDRUSERDATA_OBJTEXTLINK),

    maFileDate0( DateTime::EMPTY ),

    meCharSet(RTL_TEXTENCODING_DONTKNOW)

{

}

ImpSdrObjTextLinkUserData::~ImpSdrObjTextLinkUserData()

{

}

std::unique_ptr<SdrObjUserData> ImpSdrObjTextLinkUserData::Clone(SdrObject* ) const

{

    ImpSdrObjTextLinkUserData* pData = new ImpSdrObjTextLinkUserData;

    pData->maFileName = maFileName;

    pData->maFilterName = maFilterName;

    pData->maFileDate0 = maFileDate0;

    pData->meCharSet = meCharSet;

    pData->mpLink = nullptr;

    return std::unique_ptr<SdrObjUserData>(pData);

}

void SdrTextObj::SetTextLink(const OUString& rFileName, const OUString& rFilterName)

{

    rtl_TextEncoding eCharSet = osl_getThreadTextEncoding();

    ImpSdrObjTextLinkUserData* pData=GetLinkUserData();

    if (pData!=nullptr) {

        ReleaseTextLink();

    }

    pData=new ImpSdrObjTextLinkUserData;

    pData->maFileName = rFileName;

    pData->maFilterName = rFilterName;

    pData->meCharSet = eCharSet;

    AppendUserData(std::unique_ptr<SdrObjUserData>(pData));

    ImpRegisterLink();

}

void SdrTextObj::ReleaseTextLink()

{

    ImpDeregisterLink();

    sal_uInt16 nCount=GetUserDataCount();

    for (sal_uInt16 nNum=nCount; nNum>0;) {

        nNum--;

        SdrObjUserData* pData=GetUserData(nNum);

        if (pData->GetInventor()==SdrInventor::Default && pData->GetId()==SDRUSERDATA_OBJTEXTLINK) {

            DeleteUserData(nNum);

        }

    }

}

bool SdrTextObj::ReloadLinkedText( bool bForceLoad)

{

    ImpSdrObjTextLinkUserData*  pData = GetLinkUserData();

    bool                        bRet = true;

    if( pData )

    {

        DateTime                    aFileDT( DateTime::EMPTY );

        bool                        bExists = true;

        try

        {

            INetURLObject aURL( pData->maFileName );

            DBG_ASSERT( aURL.GetProtocol() != INetProtocol::NotValid, "invalid URL" );

            ::ucbhelper::Content aCnt( aURL.GetMainURL( INetURLObject::DecodeMechanism::NONE ), css::uno::Reference< css::ucb::XCommandEnvironment >(), comphelper::getProcessComponentContext() );

            css::uno::Any aAny( aCnt.getPropertyValue(u"DateModified"_ustr) );

            css::util::DateTime aDateTime;

            aAny >>= aDateTime;

            ::utl::typeConvert( aDateTime, aFileDT );

        }

        catch( ... )

        {

            bExists = false;

        }

        if( bExists )

        {

            bool bLoad = false;

            if( bForceLoad )

                bLoad = true;

            else

                bLoad = ( aFileDT > pData->maFileDate0 );

            if( bLoad )

            {

                bRet = LoadText( pData->maFileName, pData->meCharSet );

            }

            pData->maFileDate0 = aFileDT;

        }

    }

    return bRet;

}

bool SdrTextObj::LoadText(const OUString& rFileName, rtl_TextEncoding eCharSet)

{

    INetURLObject   aFileURL( rFileName );

    bool            bRet = false;

    if( aFileURL.GetProtocol() == INetProtocol::NotValid )

    {

        OUString aFileURLStr;

        if( osl::FileBase::getFileURLFromSystemPath( rFileName, aFileURLStr ) == osl::FileBase::E_None )

            aFileURL = INetURLObject( aFileURLStr );

        else

            aFileURL.SetSmartURL( rFileName );

    }

    DBG_ASSERT( aFileURL.GetProtocol() != INetProtocol::NotValid, "invalid URL" );

    std::unique_ptr<SvStream> pIStm(::utl::UcbStreamHelper::CreateStream( aFileURL.GetMainURL( INetURLObject::DecodeMechanism::NONE ), StreamMode::READ ));

    if( pIStm )

    {

        pIStm->SetStreamCharSet(GetSOLoadTextEncoding(eCharSet));

        char cRTF[5];

        cRTF[4] = 0;

        pIStm->ReadBytes(cRTF, 5);

        bool bRTF = cRTF[0] == '{' && cRTF[1] == '\\' && cRTF[2] == 'r' && cRTF[3] == 't' && cRTF[4] == 'f';

        pIStm->Seek(0);

        if( !pIStm->GetError() )

        {

            SetText( *pIStm, aFileURL.GetMainURL( INetURLObject::DecodeMechanism::NONE ), bRTF ? EETextFormat::Rtf : EETextFormat::Text );

            bRet = true;

        }

    }

    return bRet;

}

ImpSdrObjTextLinkUserData* SdrTextObj::GetLinkUserData() const

{

    sal_uInt16 nCount=GetUserDataCount();

    for (sal_uInt16 nNum=nCount; nNum>0;) {

        nNum--;

        SdrObjUserData * pData=GetUserData(nNum);

        if (pData->GetInventor() == SdrInventor::Default

            && pData->GetId() == SDRUSERDATA_OBJTEXTLINK)

        {

            return static_cast<ImpSdrObjTextLinkUserData *>(pData);

        }

    }

    return nullptr;

}

void SdrTextObj::ImpRegisterLink()

{

    ImpSdrObjTextLinkUserData* pData=GetLinkUserData();

    sfx2::LinkManager* pLinkManager(getSdrModelFromSdrObject().GetLinkManager());

    if (pLinkManager!=nullptr && pData!=nullptr && pData->mpLink==nullptr) { // don't register twice

        pData->mpLink = new ImpSdrObjTextLink(this);

        pLinkManager->InsertFileLink(*pData->mpLink,sfx2::SvBaseLinkObjectType::ClientFile,pData->maFileName,

                                     !pData->maFilterName.isEmpty() ?

                                      &pData->maFilterName : nullptr);

    }

}

void SdrTextObj::ImpDeregisterLink()

{

    ImpSdrObjTextLinkUserData* pData=GetLinkUserData();

    if (!pData)

        return;

    sfx2::LinkManager* pLinkManager(getSdrModelFromSdrObject().GetLinkManager());

    if (pLinkManager!=nullptr && pData->mpLink!=nullptr) { // don't register twice

        // when doing Remove, *pLink is deleted implicitly

        pLinkManager->Remove( pData->mpLink.get() );

        pData->mpLink=nullptr;

    }

}

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