/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * 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 "controller/SlsSelectionManager.hxx"

#include "SlideSorter.hxx"
#include "controller/SlideSorterController.hxx"
#include "controller/SlsAnimator.hxx"
#include "controller/SlsAnimationFunction.hxx"
#include "controller/SlsCurrentSlideManager.hxx"
#include "controller/SlsFocusManager.hxx"
#include "controller/SlsPageSelector.hxx"
#include "controller/SlsProperties.hxx"
#include "controller/SlsScrollBarManager.hxx"
#include "controller/SlsSlotManager.hxx"
#include "controller/SlsSelectionObserver.hxx"
#include "model/SlideSorterModel.hxx"
#include "model/SlsPageEnumerationProvider.hxx"
#include "model/SlsPageDescriptor.hxx"
#include "view/SlideSorterView.hxx"
#include "view/SlsLayouter.hxx"
#include "drawdoc.hxx"
#include "Window.hxx"
#include <svx/svxids.hrc>
#include <com/sun/star/drawing/XMasterPagesSupplier.hpp>
#include <com/sun/star/drawing/XDrawPagesSupplier.hpp>

#include "res_bmp.hrc"
#include "sdresid.hxx"
#include "strings.hrc"
#include "app.hrc"
#include "glob.hrc"

using namespace ::com::sun::star;
using namespace ::com::sun::star::drawing;
using namespace ::com::sun::star::uno;
using namespace ::sd::slidesorter::model;
using namespace ::sd::slidesorter::view;
using namespace ::sd::slidesorter::controller;

namespace sd { namespace slidesorter { namespace controller {

class SelectionManager::PageInsertionListener
    : public SfxListener
{
public:

};

SelectionManager::SelectionManager (SlideSorter& rSlideSorter)
    : mrSlideSorter(rSlideSorter),
      mrController(rSlideSorter.GetController()),
      maSelectionBeforeSwitch(),
      mbIsMakeSelectionVisiblePending(true),
      mnInsertionPosition(-1),
      mnAnimationId(Animator::NotAnAnimationId),
      mpPageInsertionListener(),
      mpSelectionObserver(new SelectionObserver(rSlideSorter))
{
}

SelectionManager::~SelectionManager()
{
    if (mnAnimationId != Animator::NotAnAnimationId)
        mrController.GetAnimator()->RemoveAnimation(mnAnimationId);
}

void SelectionManager::DeleteSelectedPages (const bool bSelectFollowingPage)
{
    // Create some locks to prevent updates of the model, view, selection
    // state while modifying any of them.
    SlideSorterController::ModelChangeLock aLock (mrController);
    SlideSorterView::DrawLock aDrawLock (mrSlideSorter);
    PageSelector::UpdateLock aSelectionLock (mrSlideSorter);

    // Hide focus.
    bool bIsFocusShowing = mrController.GetFocusManager().IsFocusShowing();
    if (bIsFocusShowing)
        mrController.GetFocusManager().ToggleFocus();

    // Store pointers to all selected page descriptors.  This is necessary
    // because the pages get deselected when the first one is deleted.
    model::PageEnumeration aPageEnumeration (
        PageEnumerationProvider::CreateSelectedPagesEnumeration(mrSlideSorter.GetModel()));
    ::std::vector<SdPage*> aSelectedPages;
    sal_Int32 nNewCurrentSlide (-1);
    while (aPageEnumeration.HasMoreElements())
    {
        SharedPageDescriptor pDescriptor (aPageEnumeration.GetNextElement());
        aSelectedPages.push_back(pDescriptor->GetPage());
        if (bSelectFollowingPage || nNewCurrentSlide<0)
            nNewCurrentSlide = pDescriptor->GetPageIndex();
    }
    if (aSelectedPages.empty())
        return;

    // Determine the slide to select (and thereby make the current slide)
    // after the deletion.
    if (bSelectFollowingPage)
        nNewCurrentSlide -= aSelectedPages.size() - 1;
    else
        --nNewCurrentSlide;

    // The actual deletion of the selected pages is done in one of two
    // helper functions.  They are specialized for normal respectively for
    // master pages.
    mrSlideSorter.GetView().BegUndo (SdResId(STR_UNDO_DELETEPAGES));
    if (mrSlideSorter.GetModel().GetEditMode() == EM_PAGE)
        DeleteSelectedNormalPages(aSelectedPages);
    else
        DeleteSelectedMasterPages(aSelectedPages);
    mrSlideSorter.GetView().EndUndo ();

    mrController.HandleModelChange();
    aLock.Release();

    // Show focus and move it to next valid location.
    if (bIsFocusShowing)
        mrController.GetFocusManager().ToggleFocus();

    // Set the new current slide.
    if (nNewCurrentSlide < 0)
        nNewCurrentSlide = 0;
    else if (nNewCurrentSlide >= mrSlideSorter.GetModel().GetPageCount())
        nNewCurrentSlide = mrSlideSorter.GetModel().GetPageCount()-1;
    mrController.GetPageSelector().CountSelectedPages();
    mrController.GetPageSelector().SelectPage(nNewCurrentSlide);
    mrController.GetFocusManager().SetFocusedPage(nNewCurrentSlide);
}

void SelectionManager::DeleteSelectedNormalPages (const ::std::vector<SdPage*>& rSelectedPages)
{
    // Prepare the deletion via the UNO API.
    OSL_ASSERT(mrSlideSorter.GetModel().GetEditMode() == EM_PAGE);

    try
    {
        Reference<drawing::XDrawPagesSupplier> xDrawPagesSupplier( mrSlideSorter.GetModel().GetDocument()->getUnoModel(), UNO_QUERY_THROW );
        Reference<drawing::XDrawPages> xPages( xDrawPagesSupplier->getDrawPages(), UNO_QUERY_THROW );

        // Iterate over all pages that where seleted when this method was called
        // and delete the draw page the notes page.  The iteration is done in
        // reverse order so that when one slide is not deleted (to avoid an
        // empty document) the remaining slide is the first one.
        ::std::vector<SdPage*>::const_reverse_iterator aI;
        for (aI=rSelectedPages.rbegin(); aI!=rSelectedPages.rend(); ++aI)
        {
            // Do not delete the last slide in the document.
            if (xPages->getCount() <= 1)
                break;

            const sal_uInt16 nPage (model::FromCoreIndex((*aI)->GetPageNum()));

            Reference< XDrawPage > xPage( xPages->getByIndex( nPage ), UNO_QUERY_THROW );
            xPages->remove(xPage);
        }
    }
    catch( Exception& )
    {
        OSL_FAIL("SelectionManager::DeleteSelectedNormalPages(), exception caught!");
    }
}

void SelectionManager::DeleteSelectedMasterPages (const ::std::vector<SdPage*>& rSelectedPages)
{
    // Prepare the deletion via the UNO API.
    OSL_ASSERT(mrSlideSorter.GetModel().GetEditMode() == EM_MASTERPAGE);

    try
    {
        Reference<drawing::XMasterPagesSupplier> xDrawPagesSupplier( mrSlideSorter.GetModel().GetDocument()->getUnoModel(), UNO_QUERY_THROW );
        Reference<drawing::XDrawPages> xPages( xDrawPagesSupplier->getMasterPages(), UNO_QUERY_THROW );

        // Iterate over all pages that where seleted when this method was called
        // and delete the draw page the notes page.  The iteration is done in
        // reverse order so that when one slide is not deleted (to avoid an
        // empty document) the remaining slide is the first one.
        ::std::vector<SdPage*>::const_reverse_iterator aI;
        for (aI=rSelectedPages.rbegin(); aI!=rSelectedPages.rend(); ++aI)
        {
            // Do not delete the last slide in the document.
            if (xPages->getCount() <= 1)
                break;

            const sal_uInt16 nPage (model::FromCoreIndex((*aI)->GetPageNum()));

            Reference< XDrawPage > xPage( xPages->getByIndex( nPage ), UNO_QUERY_THROW );
            xPages->remove(xPage);
        }
    }
    catch( Exception& )
    {
        OSL_FAIL("SelectionManager::DeleteSelectedMasterPages(), exception caught!");
    }
}

void SelectionManager::SelectionHasChanged (const bool bMakeSelectionVisible)
{
    if (bMakeSelectionVisible)
        mbIsMakeSelectionVisiblePending = true;

    ViewShell* pViewShell = mrSlideSorter.GetViewShell();
    if (pViewShell != NULL)
    {
        pViewShell->Invalidate (SID_EXPAND_PAGE);
        pViewShell->Invalidate (SID_SUMMARY_PAGE);
        pViewShell->Invalidate(SID_SHOW_SLIDE);
        pViewShell->Invalidate(SID_HIDE_SLIDE);
        pViewShell->Invalidate(SID_DELETE_PAGE);
        pViewShell->Invalidate(SID_DELETE_MASTER_PAGE);
        pViewShell->Invalidate(SID_ASSIGN_LAYOUT);

        // StatusBar
        pViewShell->Invalidate (SID_STATUS_PAGE);
        pViewShell->Invalidate (SID_STATUS_LAYOUT);

        OSL_ASSERT(mrController.GetCurrentSlideManager());
        SharedPageDescriptor pDescriptor(mrController.GetCurrentSlideManager()->GetCurrentSlide());
        if (pDescriptor.get() != NULL)
            pViewShell->UpdatePreview(pDescriptor->GetPage());

        // Tell the selection change listeners that the selection has changed.
        ::std::vector<Link<>>::iterator iListener (maSelectionChangeListeners.begin());
        ::std::vector<Link<>>::iterator iEnd (maSelectionChangeListeners.end());
        for (; iListener!=iEnd; ++iListener)
        {
            iListener->Call(NULL);
        }

        // Reset the insertion position: until set again it is calculated from
        // the current selection.
        mnInsertionPosition = -1;
    }
}

void SelectionManager::AddSelectionChangeListener (const Link<>& rListener)
{
    if (::std::find (
        maSelectionChangeListeners.begin(),
        maSelectionChangeListeners.end(),
        rListener) == maSelectionChangeListeners.end())
    {
        maSelectionChangeListeners.push_back (rListener);
    }
}

void SelectionManager::RemoveSelectionChangeListener(const Link<>&rListener)
{
    maSelectionChangeListeners.erase (
        ::std::find (
            maSelectionChangeListeners.begin(),
            maSelectionChangeListeners.end(),
            rListener));
}

sal_Int32 SelectionManager::GetInsertionPosition() const
{
    sal_Int32 nInsertionPosition (mnInsertionPosition);
    if (nInsertionPosition < 0)
    {
        model::PageEnumeration aSelectedPages
            (model::PageEnumerationProvider::CreateSelectedPagesEnumeration(
                mrSlideSorter.GetModel()));
        // Initialize (for the case of an empty selection) with the position
        // at the end of the document.
        nInsertionPosition = mrSlideSorter.GetModel().GetPageCount();
        while (aSelectedPages.HasMoreElements())
        {
            const sal_Int32 nPosition (aSelectedPages.GetNextElement()->GetPage()->GetPageNum());
            // Convert *2+1 index to straight index (n-1)/2 after the page
            // (+1).
            nInsertionPosition = model::FromCoreIndex(nPosition) + 1;
        }

    }
    return nInsertionPosition;
}

void SelectionManager::SetInsertionPosition (const sal_Int32 nInsertionPosition)
{
    if (nInsertionPosition < 0)
        mnInsertionPosition = -1;
    else if (nInsertionPosition > mrSlideSorter.GetModel().GetPageCount())
    {
        // Assert but then ignore invalid values.
        OSL_ASSERT(nInsertionPosition<=mrSlideSorter.GetModel().GetPageCount());
        return;
    }
    else
        mnInsertionPosition = nInsertionPosition;
}

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

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