/**************************************************************
 * 
 * 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
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 * 
 *************************************************************/



#include "precompiled_sd.hxx"

#include "controller/SlsInsertionIndicatorHandler.hxx"
#include "controller/SlsProperties.hxx"
#include "view/SlideSorterView.hxx"
#include "view/SlsLayouter.hxx"
#include "view/SlsInsertionIndicatorOverlay.hxx"
#include "model/SlideSorterModel.hxx"
#include "model/SlsPageEnumerationProvider.hxx"
#include <com/sun/star/datatransfer/dnd/DNDConstants.hpp>

#include "SlideSorter.hxx"

using namespace ::com::sun::star::datatransfer::dnd::DNDConstants;

namespace sd { namespace slidesorter { namespace controller {


InsertionIndicatorHandler::InsertionIndicatorHandler (SlideSorter& rSlideSorter)
    : mrSlideSorter(rSlideSorter),
      mpInsertAnimator(),
      mpInsertionIndicatorOverlay(new view::InsertionIndicatorOverlay(rSlideSorter)),
      maInsertPosition(),
      meMode(MoveMode),
      mbIsActive(false),
      mbIsReadOnly(mrSlideSorter.GetModel().IsReadOnly()),
      mbIsOverSourceView(true),
      maIconSize(0,0),
      mbIsForcedShow(false)
{
}




InsertionIndicatorHandler::~InsertionIndicatorHandler (void)
{
}




void InsertionIndicatorHandler::Start (const bool bIsOverSourceView)
{
    if (mbIsActive)
    {
        OSL_ASSERT(!mbIsActive);
    }

    mbIsReadOnly = mrSlideSorter.GetModel().IsReadOnly();
    if (mbIsReadOnly)
        return;

    mbIsActive = true;
    mbIsOverSourceView = bIsOverSourceView;
}




void InsertionIndicatorHandler::End (const controller::Animator::AnimationMode eMode)
{
    if (mbIsForcedShow ||  ! mbIsActive || mbIsReadOnly)
        return;

    GetInsertAnimator()->Reset(eMode);

    mbIsActive = false;
    //    maInsertPosition = view::InsertPosition();
    meMode = UnknownMode;

    mpInsertionIndicatorOverlay->Hide();
    mpInsertionIndicatorOverlay.reset(new view::InsertionIndicatorOverlay(mrSlideSorter));
}




void InsertionIndicatorHandler::ForceShow (void)
{
    mbIsForcedShow = true;
}




void InsertionIndicatorHandler::ForceEnd (void)
{
    mbIsForcedShow = false;
    End(Animator::AM_Immediate);
}




void InsertionIndicatorHandler::UpdateIndicatorIcon (const SdTransferable* pTransferable)
{
    mpInsertionIndicatorOverlay->Create(pTransferable);
    maIconSize = mpInsertionIndicatorOverlay->GetSize();
}




InsertionIndicatorHandler::Mode InsertionIndicatorHandler::GetModeFromDndAction (
    const sal_Int8 nDndAction)
{
    if ((nDndAction & ACTION_MOVE) != 0)
        return MoveMode;
    else if ((nDndAction & ACTION_COPY) != 0)
        return CopyMode;
    else
        return UnknownMode;
}




void InsertionIndicatorHandler::UpdatePosition (
    const Point& rMouseModelPosition,
    const Mode eMode)
{
    if ( ! mbIsActive)
        return;

    if (mbIsReadOnly)
        return;

    SetPosition(rMouseModelPosition, eMode);
}




void InsertionIndicatorHandler::UpdatePosition (
    const Point& rMouseModelPosition,
    const sal_Int8 nDndAction)
{
    UpdatePosition(rMouseModelPosition, GetModeFromDndAction(nDndAction));
}




bool InsertionIndicatorHandler::IsActive (void) const
{
    return mbIsActive;
}




sal_Int32 InsertionIndicatorHandler::GetInsertionPageIndex (void) const
{
    if (mbIsReadOnly)
        return -1;
    else
        return maInsertPosition.GetIndex();
}




void InsertionIndicatorHandler::SetPosition (
    const Point& rPoint,
    const Mode eMode)
{
    view::Layouter& rLayouter (mrSlideSorter.GetView().GetLayouter());

    const view::InsertPosition aInsertPosition (rLayouter.GetInsertPosition(
        rPoint,
        maIconSize,
        mrSlideSorter.GetModel()));

    static sal_Int32 TargetIndex (1);
    if (aInsertPosition.GetIndex() == TargetIndex)
    {
        const view::InsertPosition aPosition (rLayouter.GetInsertPosition(
            rPoint,
            maIconSize,
            mrSlideSorter.GetModel()));
        const view::InsertPosition aPosition2 (rLayouter.GetInsertPosition(
            rPoint,
            maIconSize,
            mrSlideSorter.GetModel()));
    }
    
    if (maInsertPosition != aInsertPosition
        || meMode != eMode
        //        || ! mpInsertionIndicatorOverlay->IsVisible()
        )
    {
        maInsertPosition = aInsertPosition;
        meMode = eMode;
        mbIsInsertionTrivial = IsInsertionTrivial(maInsertPosition.GetIndex(), eMode);
        if (maInsertPosition.GetIndex()>=0 && ! mbIsInsertionTrivial)
        {
            mpInsertionIndicatorOverlay->SetLocation(maInsertPosition.GetLocation());
    
            GetInsertAnimator()->SetInsertPosition(maInsertPosition);
            mpInsertionIndicatorOverlay->Show();
        }
        else
        {
            GetInsertAnimator()->Reset(Animator::AM_Animated);
            mpInsertionIndicatorOverlay->Hide();
        }
    }
}




::boost::shared_ptr<view::InsertAnimator> InsertionIndicatorHandler::GetInsertAnimator (void)
{
    if ( ! mpInsertAnimator)
        mpInsertAnimator.reset(new view::InsertAnimator(mrSlideSorter));
    return mpInsertAnimator;
}




bool InsertionIndicatorHandler::IsInsertionTrivial (
    const sal_Int32 nInsertionIndex,
    const Mode eMode) const
{
    if (eMode == CopyMode)
        return false;
    else if (eMode == UnknownMode)
        return true;

    if ( ! mbIsOverSourceView)
        return false;

    // Iterate over all selected pages and check whether there are
    // holes.  While we do this we remember the indices of the first and
    // last selected page as preparation for the next step.
    sal_Int32 nCurrentIndex = -1;
    sal_Int32 nFirstIndex = -1;
    sal_Int32 nLastIndex = -1;
    model::PageEnumeration aSelectedPages (
        model::PageEnumerationProvider::CreateSelectedPagesEnumeration(
            mrSlideSorter.GetModel()));
    while (aSelectedPages.HasMoreElements())
    {
        model::SharedPageDescriptor pDescriptor (aSelectedPages.GetNextElement());

        // Get the page number and compare it to the last one.
        const sal_Int32 nPageNumber (pDescriptor->GetPageIndex());
        if (nCurrentIndex>=0 && nPageNumber>(nCurrentIndex+1))
            return false;
        else
            nCurrentIndex = nPageNumber;

        // Remember indices of the first and last page of the selection.
        if (nFirstIndex == -1)
            nFirstIndex = nPageNumber;
        nLastIndex = nPageNumber;
    }

    // When we come here then the selection has no holes.  We still have
    // to check that the insertion position is not directly in front or
    // directly behind the selection and thus moving the selection there
    // would not change the model.
    if (nInsertionIndex<nFirstIndex || nInsertionIndex>(nLastIndex+1))
        return false;

    return true;
}




bool InsertionIndicatorHandler::IsInsertionTrivial (const sal_Int8 nDndAction)
{
    return IsInsertionTrivial(GetInsertionPageIndex(), GetModeFromDndAction(nDndAction));
}




//===== InsertionIndicatorHandler::ForceShowContext ===========================

InsertionIndicatorHandler::ForceShowContext::ForceShowContext (
    const ::boost::shared_ptr<InsertionIndicatorHandler>& rpHandler)
    : mpHandler(rpHandler)
{
    mpHandler->ForceShow();
}




InsertionIndicatorHandler::ForceShowContext::~ForceShowContext (void)
{
    mpHandler->ForceEnd();
}

} } } // end of namespace ::sd::slidesorter::controller