/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 *
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 *
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenOffice.org.  If not, see
 * <http://www.openoffice.org/license.html>
 * for a copy of the LGPLv3 License.
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#include <bf_svtools/undo.hxx>

namespace binfilter
{

TYPEINIT0(SfxUndoAction);
TYPEINIT0(SfxListUndoAction);
TYPEINIT0(SfxLinkUndoAction);
TYPEINIT0(SfxRepeatTarget);

SfxRepeatTarget::~SfxRepeatTarget()
{
}

BOOL SfxUndoAction::IsLinked()
{
    return bLinked;
}

void SfxUndoAction::SetLinked( BOOL bIsLinked )
{
    bLinked = bIsLinked;
}

SfxUndoAction::~SfxUndoAction()
{
}

SfxUndoAction::SfxUndoAction()
{
    SetLinked( FALSE );
}

BOOL SfxUndoAction::Merge( SfxUndoAction * )
{
    return FALSE;
}

XubString SfxUndoAction::GetComment() const
{
    return XubString();
}

USHORT SfxUndoAction::GetId() const
{
    return 0;
}

XubString SfxUndoAction::GetRepeatComment(SfxRepeatTarget&) const
{
    return GetComment();
}

void SfxUndoAction::Undo()
{
}

void SfxUndoAction::Redo()
{
}

void SfxUndoAction::Repeat(SfxRepeatTarget&)
{
}

BOOL SfxUndoAction::CanRepeat(SfxRepeatTarget&) const
{
    return TRUE;
}

SfxUndoManager::SfxUndoManager( USHORT nMaxUndoActionCount ) : pFatherUndoArray(0)
{
    pUndoArray=new SfxUndoArray(nMaxUndoActionCount);
    pActUndoArray=pUndoArray;

}

SfxUndoManager::~SfxUndoManager()
{
    delete pUndoArray;
}

void SfxUndoManager::SetMaxUndoActionCount( USHORT nMaxUndoActionCount )
{
    // Remove entries from the pActUndoArray when we have to reduce
    // the number of entries due to a lower nMaxUndoActionCount.
    // Both redo and undo action entries will be removed until we reached the
    // new nMaxUndoActionCount.

    long nNumToDelete = pActUndoArray->aUndoActions.Count() - nMaxUndoActionCount;
    if ( nNumToDelete > 0 )
    {
        while ( nNumToDelete > 0 )
        {
            USHORT nPos = pActUndoArray->aUndoActions.Count();
            if ( nPos > pActUndoArray->nCurUndoAction )
            {
                if ( !pActUndoArray->aUndoActions[nPos-1]->IsLinked() )
                {
                    delete pActUndoArray->aUndoActions[nPos-1];
                    pActUndoArray->aUndoActions.Remove( nPos-1 );
                    --nNumToDelete;
                }
            }

            if ( nNumToDelete > 0 && pActUndoArray->nCurUndoAction > 0 )
            {
                if ( !pActUndoArray->aUndoActions[0]->IsLinked() )
                {
                    delete pActUndoArray->aUndoActions[0];
                    pActUndoArray->aUndoActions.Remove(0);
                    --pActUndoArray->nCurUndoAction;
                    --nNumToDelete;
                }
            }

            if ( nPos == pActUndoArray->aUndoActions.Count() )
                break; // Cannot delete more entries
        }
    }

    pActUndoArray->nMaxUndoActions = nMaxUndoActionCount;
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetMaxUndoActionCount() const
{
    return pActUndoArray->nMaxUndoActions;
}

//------------------------------------------------------------------------

void SfxUndoManager::Clear()
{
    while ( pActUndoArray->aUndoActions.Count() )
    {
        SfxUndoAction *pAction=
            pActUndoArray->aUndoActions[pActUndoArray->aUndoActions.Count() - 1];
        pActUndoArray->aUndoActions.Remove( pActUndoArray->aUndoActions.Count() - 1 );
        delete pAction;
    }

    pActUndoArray->nCurUndoAction = 0;
}

//------------------------------------------------------------------------

void SfxUndoManager::ClearRedo()
{
    while ( pActUndoArray->aUndoActions.Count() > pActUndoArray->nCurUndoAction )
    {
        SfxUndoAction *pAction=
            pActUndoArray->aUndoActions[pActUndoArray->aUndoActions.Count() - 1];
        pActUndoArray->aUndoActions.Remove( pActUndoArray->aUndoActions.Count() - 1 );
        delete pAction;
    }
}

//------------------------------------------------------------------------

void SfxUndoManager::AddUndoAction( SfxUndoAction *pAction, BOOL bTryMerge )
{
    // Redo-Actions loeschen
    for ( USHORT nPos = pActUndoArray->aUndoActions.Count();
          nPos > pActUndoArray->nCurUndoAction; --nPos )
        delete pActUndoArray->aUndoActions[nPos-1];

    pActUndoArray->aUndoActions.Remove(
        pActUndoArray->nCurUndoAction,
        pActUndoArray->aUndoActions.Count() - pActUndoArray->nCurUndoAction );

    if ( pActUndoArray->nMaxUndoActions )
    {
        SfxUndoAction *pTmpAction = pActUndoArray->nCurUndoAction ?
            pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction-1] : 0;

        if ( !bTryMerge || !(pTmpAction && pTmpAction->Merge(pAction)) )
        {
            // auf Max-Anzahl anpassen
            if( pActUndoArray == pUndoArray )
                while( pActUndoArray->aUndoActions.Count() >=
                       pActUndoArray->nMaxUndoActions &&
                       !pActUndoArray->aUndoActions[0]->IsLinked() )
                {
                    delete pActUndoArray->aUndoActions[0];
                    pActUndoArray->aUndoActions.Remove(0);
                    --pActUndoArray->nCurUndoAction;
                }

            // neue Action anh"angen
            const SfxUndoAction* pTemp = pAction;
            pActUndoArray->aUndoActions.Insert(
                pTemp, pActUndoArray->nCurUndoAction++ );
            return;
        }
    }

    delete pAction;
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetUndoActionCount() const
{
    return pActUndoArray->nCurUndoAction;
}

//------------------------------------------------------------------------

XubString SfxUndoManager::GetUndoActionComment( USHORT nNo ) const
{
    if( nNo < pActUndoArray->nCurUndoAction )
    {
        return pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction-1-nNo]->GetComment(); //!
    }
    else
    {
        XubString aEmpty;
        return aEmpty;
    }
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetUndoActionId( USHORT nNo ) const
{
    if( nNo < pActUndoArray->nCurUndoAction )
    {
        return pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction-1-nNo]->GetId(); //!
    }
    else
    {
        return 0;
    }
}

//------------------------------------------------------------------------

BOOL SfxUndoManager::Undo( USHORT )
{
    if ( pActUndoArray->nCurUndoAction )
    {
        Undo( *pActUndoArray->aUndoActions[ --pActUndoArray->nCurUndoAction ] );
        return TRUE;
    }
    return FALSE;
}

//------------------------------------------------------------------------

void SfxUndoManager::Undo( SfxUndoAction &rAction )
{
    rAction.Undo();
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetRedoActionCount() const
{
    return pActUndoArray->aUndoActions.Count() - pActUndoArray->nCurUndoAction; //!
}

//------------------------------------------------------------------------

XubString SfxUndoManager::GetRedoActionComment( USHORT nNo ) const
{
    return pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction+nNo]->GetComment(); //!
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetRedoActionId( USHORT nNo ) const
{
    return pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction+nNo]->GetId(); //!
}

//------------------------------------------------------------------------

BOOL SfxUndoManager::Redo( USHORT )
{
    if ( pActUndoArray->aUndoActions.Count() > pActUndoArray->nCurUndoAction )
    {
        Redo( *pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction++] );
        return TRUE;
    }

    return FALSE;
}

//------------------------------------------------------------------------

void SfxUndoManager::Redo( SfxUndoAction &rAction )
{
    rAction.Redo();
}

//------------------------------------------------------------------------

USHORT SfxUndoManager::GetRepeatActionCount() const
{
    return pActUndoArray->aUndoActions.Count();
}

//------------------------------------------------------------------------

XubString SfxUndoManager::GetRepeatActionComment( SfxRepeatTarget &rTarget, USHORT nNo ) const
{
    return pActUndoArray->aUndoActions[ pActUndoArray->aUndoActions.Count() - 1 - nNo ]
        ->GetRepeatComment(rTarget);
}

//------------------------------------------------------------------------

BOOL SfxUndoManager::Repeat( SfxRepeatTarget &rTarget, USHORT, USHORT )
{
    if ( pActUndoArray->aUndoActions.Count() )
    {
        Repeat( rTarget, *pActUndoArray->aUndoActions[ pActUndoArray->aUndoActions.Count() - 1 ] );
        return TRUE;
    }

    return FALSE;
}

//------------------------------------------------------------------------

void SfxUndoManager::Repeat( SfxRepeatTarget &rTarget, SfxUndoAction &rAction )
{
    if ( rAction.CanRepeat(rTarget) )
        rAction.Repeat(rTarget);
}

//------------------------------------------------------------------------

BOOL SfxUndoManager::CanRepeat( SfxRepeatTarget &rTarget, SfxUndoAction &rAction ) const
{
    return rAction.CanRepeat(rTarget);
}

//------------------------------------------------------------------------

BOOL SfxUndoManager::CanRepeat( SfxRepeatTarget &rTarget, USHORT nNo ) const
{
    if ( pActUndoArray->aUndoActions.Count() > nNo )
    {
        USHORT nActionNo = pActUndoArray->aUndoActions.Count() - 1 - nNo;
        return pActUndoArray->aUndoActions[nActionNo]->CanRepeat(rTarget);
    }

    return FALSE;
}

//------------------------------------------------------------------------

void SfxUndoManager::EnterListAction(const XubString& rComment, const XubString &rRepeatComment, USHORT nId )
{
    if ( !pUndoArray->nMaxUndoActions )
        return;

    pFatherUndoArray=pActUndoArray;
    SfxListUndoAction *pAction=new SfxListUndoAction(
        rComment, rRepeatComment, nId, pActUndoArray);
    AddUndoAction( pAction );
    pActUndoArray=pAction;
}

//------------------------------------------------------------------------

void SfxUndoManager::LeaveListAction()
{
    if ( !pUndoArray->nMaxUndoActions )
        return;

    if( pActUndoArray == pUndoArray )
    {
        return;
    }

    SfxUndoArray* pTmp=pActUndoArray;
    pActUndoArray=pActUndoArray->pFatherUndoArray;

    // If no undo action where added, delete the undo list action
    SfxUndoAction *pTmpAction= pActUndoArray->aUndoActions[pActUndoArray->nCurUndoAction-1];
    if(!pTmp->nCurUndoAction)
    {
        pActUndoArray->aUndoActions.Remove( --pActUndoArray->nCurUndoAction);
        delete pTmpAction;
    }
    else
    {
        // if the undo array has no comment, try to get it from its children
        SfxListUndoAction* pList = dynamic_cast< SfxListUndoAction * >( pTmpAction );
        if( pList && pList->GetComment().Len() == 0 )
        {
            USHORT n;
            for( n = 0; n < pList->aUndoActions.Count(); n++ )
            {
                if( pList->aUndoActions[n]->GetComment().Len() )
                {
                    pList->SetComment( pList->aUndoActions[n]->GetComment() );
                    break;
                }
            }
        }
    }
}

//------------------------------------------------------------------------

USHORT SfxListUndoAction::GetId() const
{
    return nId;
}

//------------------------------------------------------------------------

XubString SfxListUndoAction::GetComment() const
{
    return aComment;
}

//------------------------------------------------------------------------

void SfxListUndoAction::SetComment( const UniString& rComment )
{
    aComment = rComment;
}

//------------------------------------------------------------------------

XubString SfxListUndoAction::GetRepeatComment(SfxRepeatTarget &) const
{
    return aRepeatComment;
}


//------------------------------------------------------------------------

SfxListUndoAction::SfxListUndoAction
(
    const XubString &rComment,
    const XubString rRepeatComment,
    USHORT Id,
    SfxUndoArray *pFather
)
: nId(Id), aComment(rComment), aRepeatComment(rRepeatComment)
{
    pFatherUndoArray = pFather;
    nMaxUndoActions = USHRT_MAX;
}

//------------------------------------------------------------------------

void SfxListUndoAction::Undo()
{
    for(INT16 i=nCurUndoAction-1;i>=0;i--)
        aUndoActions[i]->Undo();
    nCurUndoAction=0;
}

//------------------------------------------------------------------------

void SfxListUndoAction::Redo()
{
    for(USHORT i=nCurUndoAction;i<aUndoActions.Count();i++)
        aUndoActions[i]->Redo();
    nCurUndoAction = aUndoActions.Count();
}

//------------------------------------------------------------------------

void SfxListUndoAction::Repeat(SfxRepeatTarget&rTarget)
{
    for(USHORT i=0;i<nCurUndoAction;i++)
        aUndoActions[i]->Repeat(rTarget);
}

//------------------------------------------------------------------------

BOOL SfxListUndoAction::CanRepeat(SfxRepeatTarget&r)  const
{
    for(USHORT i=0;i<nCurUndoAction;i++)
        if(!aUndoActions[i]->CanRepeat(r))
            return FALSE;
    return TRUE;
}

//------------------------------------------------------------------------

BOOL SfxListUndoAction::Merge( SfxUndoAction *pNextAction )
{
    return aUndoActions.Count() && aUndoActions[aUndoActions.Count()-1]->Merge( pNextAction );
}

//------------------------------------------------------------------------

void SfxLinkUndoAction::Undo()
{
    if ( pAction )
        pUndoManager->Undo(1);
}

//------------------------------------------------------------------------

void SfxLinkUndoAction::Redo()
{
    if ( pAction )
        pUndoManager->Redo(1);
}

//------------------------------------------------------------------------


BOOL SfxLinkUndoAction::CanRepeat(SfxRepeatTarget& r) const
{
    return pAction && pUndoManager->CanRepeat(r,*pAction);
}


//------------------------------------------------------------------------


void SfxLinkUndoAction::Repeat(SfxRepeatTarget&r)
{
    if ( pAction )
        pUndoManager->Repeat(r,*pAction);
}


//------------------------------------------------------------------------

XubString SfxLinkUndoAction::GetComment() const
{
    if ( pAction )
        return pAction->GetComment();
    else
        return XubString();
}


//------------------------------------------------------------------------

XubString SfxLinkUndoAction::GetRepeatComment(SfxRepeatTarget&r) const
{
    if ( pAction )
        return pAction->GetRepeatComment(r);
    else
        return XubString();
}

//------------------------------------------------------------------------

SfxLinkUndoAction::~SfxLinkUndoAction()
{
    if( pAction )
        pAction->SetLinked( FALSE );
}


//------------------------------------------------------------------------

SfxUndoArray::~SfxUndoArray()
{
    while ( aUndoActions.Count() )
    {
        SfxUndoAction *pAction =
            aUndoActions[ aUndoActions.Count() - 1 ];
        aUndoActions.Remove( aUndoActions.Count() - 1 );
        delete pAction;
    }
}


USHORT SfxLinkUndoAction::GetId() const
{
      return pAction ? pAction->GetId() : 0;
}


}

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