/* -*- 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 <scitems.hxx>
#include <AccessiblePreviewTable.hxx>
#include <AccessiblePreviewCell.hxx>
#include <AccessiblePreviewHeaderCell.hxx>
#include <prevwsh.hxx>
#include <prevloc.hxx>
#include <attrib.hxx>
#include <document.hxx>
#include <scresid.hxx>
#include <strings.hrc>
#include <strings.hxx>

#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>

#include <vcl/window.hxx>
#include <vcl/svapp.hxx>
#include <svl/hint.hxx>
#include <unotools/accessiblestatesethelper.hxx>
#include <comphelper/sequence.hxx>

using namespace ::com::sun::star;
using namespace ::com::sun::star::accessibility;

//=====  internal  ============================================================

ScAccessiblePreviewTable::ScAccessiblePreviewTable( const css::uno::Reference<css::accessibility::XAccessible>& rxParent,
                            ScPreviewShell* pViewShell, sal_Int32 nIndex ) :
    ScAccessibleContextBase( rxParent, AccessibleRole::TABLE ),
    mpViewShell( pViewShell ),
    mnIndex( nIndex )
{
    if (mpViewShell)
        mpViewShell->AddAccessibilityObject(*this);
}

ScAccessiblePreviewTable::~ScAccessiblePreviewTable()
{
    if (!ScAccessibleContextBase::IsDefunc() && !rBHelper.bInDispose)
    {
        // increment refcount to prevent double call off dtor
        osl_atomic_increment( &m_refCount );
        dispose();
    }
}

void SAL_CALL ScAccessiblePreviewTable::disposing()
{
    SolarMutexGuard aGuard;
    if (mpViewShell)
    {
        mpViewShell->RemoveAccessibilityObject(*this);
        mpViewShell = nullptr;
    }

    mpTableInfo.reset();

    ScAccessibleContextBase::disposing();
}

//=====  SfxListener  =====================================================

void ScAccessiblePreviewTable::Notify( SfxBroadcaster& rBC, const SfxHint& rHint )
{
    const SfxHintId nId = rHint.GetId();
    if ( nId == SfxHintId::DataChanged )
    {
        //  column / row layout may change with any document change,
        //  so it must be invalidated
        mpTableInfo.reset();
    }
    else if (nId == SfxHintId::ScAccVisAreaChanged)
    {
        AccessibleEventObject aEvent;
        aEvent.EventId = AccessibleEventId::VISIBLE_DATA_CHANGED;
        aEvent.Source = uno::Reference< XAccessibleContext >(this);
        CommitChange(aEvent);
    }

    ScAccessibleContextBase::Notify(rBC, rHint);
}

//=====  XInterface  =====================================================

uno::Any SAL_CALL ScAccessiblePreviewTable::queryInterface( uno::Type const & rType )
{
    uno::Any aAny (ScAccessiblePreviewTableImpl::queryInterface(rType));
    return aAny.hasValue() ? aAny : ScAccessibleContextBase::queryInterface(rType);
}

void SAL_CALL ScAccessiblePreviewTable::acquire()
    noexcept
{
    ScAccessibleContextBase::acquire();
}

void SAL_CALL ScAccessiblePreviewTable::release()
    noexcept
{
    ScAccessibleContextBase::release();
}

//=====  XAccessibleTable  ================================================

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleRowCount()
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    sal_Int32 nRet = 0;
    if ( mpTableInfo )
        nRet = mpTableInfo->GetRows();
    return nRet;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleColumnCount()
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    sal_Int32 nRet = 0;
    if ( mpTableInfo )
        nRet = mpTableInfo->GetCols();
    return nRet;
}

OUString SAL_CALL ScAccessiblePreviewTable::getAccessibleRowDescription( sal_Int32 nRow )
{
    SolarMutexGuard aGuard;
    FillTableInfo();
    if ( nRow < 0 || (mpTableInfo && nRow >= mpTableInfo->GetRows()) )
        throw lang::IndexOutOfBoundsException();

    return OUString();
}

OUString SAL_CALL ScAccessiblePreviewTable::getAccessibleColumnDescription( sal_Int32 nColumn )
{
    SolarMutexGuard aGuard;
    FillTableInfo();
    if ( nColumn < 0 || (mpTableInfo && nColumn >= mpTableInfo->GetCols()) )
        throw lang::IndexOutOfBoundsException();

    return OUString();
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleRowExtentAt( sal_Int32 nRow, sal_Int32 nColumn )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    sal_Int32 nRows = 1;
    if ( !mpViewShell || !mpTableInfo || nColumn < 0 || nRow < 0 ||
            nColumn >= mpTableInfo->GetCols() || nRow >= mpTableInfo->GetRows() )
        throw lang::IndexOutOfBoundsException();

    const ScPreviewColRowInfo& rColInfo = mpTableInfo->GetColInfo()[nColumn];
    const ScPreviewColRowInfo& rRowInfo = mpTableInfo->GetRowInfo()[nRow];

    if ( rColInfo.bIsHeader || rRowInfo.bIsHeader )
    {
        //  header cells only span a single cell
    }
    else
    {
        ScDocument& rDoc = mpViewShell->GetDocument();
        const ScMergeAttr* pItem = rDoc.GetAttr(
            static_cast<SCCOL>(rColInfo.nDocIndex), static_cast<SCROW>(rRowInfo.nDocIndex), mpTableInfo->GetTab(), ATTR_MERGE );
        if ( pItem && pItem->GetRowMerge() > 0 )
            nRows = pItem->GetRowMerge();
    }

    return nRows;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleColumnExtentAt( sal_Int32 nRow, sal_Int32 nColumn )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    sal_Int32 nColumns = 1;
    if ( !mpViewShell || !mpTableInfo || nColumn < 0 || nRow < 0 ||
            nColumn >= mpTableInfo->GetCols() || nRow >= mpTableInfo->GetRows() )
        throw lang::IndexOutOfBoundsException();

    const ScPreviewColRowInfo& rColInfo = mpTableInfo->GetColInfo()[nColumn];
    const ScPreviewColRowInfo& rRowInfo = mpTableInfo->GetRowInfo()[nRow];

    if ( rColInfo.bIsHeader || rRowInfo.bIsHeader )
    {
        //  header cells only span a single cell
    }
    else
    {
        ScDocument& rDoc = mpViewShell->GetDocument();
        const ScMergeAttr* pItem = rDoc.GetAttr(
            static_cast<SCCOL>(rColInfo.nDocIndex), static_cast<SCROW>(rRowInfo.nDocIndex), mpTableInfo->GetTab(), ATTR_MERGE );
        if ( pItem && pItem->GetColMerge() > 0 )
            nColumns = pItem->GetColMerge();
    }

    return nColumns;
}

uno::Reference< XAccessibleTable > SAL_CALL ScAccessiblePreviewTable::getAccessibleRowHeaders()
{
    //! missing
    return nullptr;
}

uno::Reference< XAccessibleTable > SAL_CALL ScAccessiblePreviewTable::getAccessibleColumnHeaders()
{
    //! missing
    return nullptr;
}

uno::Sequence< sal_Int32 > SAL_CALL ScAccessiblePreviewTable::getSelectedAccessibleRows()
{
    //  in the page preview, there is no selection
    return {};
}

uno::Sequence< sal_Int32 > SAL_CALL ScAccessiblePreviewTable::getSelectedAccessibleColumns()
{
    //  in the page preview, there is no selection
    return {};
}

sal_Bool SAL_CALL ScAccessiblePreviewTable::isAccessibleRowSelected( sal_Int32 nRow )
{
    //  in the page preview, there is no selection

    SolarMutexGuard aGuard;
    FillTableInfo();
    if ( nRow < 0 || (mpTableInfo && nRow >= mpTableInfo->GetRows()) )
        throw lang::IndexOutOfBoundsException();

    return false;
}

sal_Bool SAL_CALL ScAccessiblePreviewTable::isAccessibleColumnSelected( sal_Int32 nColumn )
{
    //  in the page preview, there is no selection

    SolarMutexGuard aGuard;
    FillTableInfo();
    if ( nColumn < 0 || (mpTableInfo && nColumn >= mpTableInfo->GetCols()) )
        throw lang::IndexOutOfBoundsException();

    return false;
}

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewTable::getAccessibleCellAt( sal_Int32 nRow, sal_Int32 nColumn )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    uno::Reference<XAccessible> xRet;
    if ( mpTableInfo && nColumn >= 0 && nRow >= 0 && nColumn < mpTableInfo->GetCols() && nRow < mpTableInfo->GetRows() )
    {
        //  index iterates horizontally
        tools::Long nNewIndex = nRow * mpTableInfo->GetCols() + nColumn;

        const ScPreviewColRowInfo& rColInfo = mpTableInfo->GetColInfo()[nColumn];
        const ScPreviewColRowInfo& rRowInfo = mpTableInfo->GetRowInfo()[nRow];

        ScAddress aCellPos( static_cast<SCCOL>(rColInfo.nDocIndex), static_cast<SCROW>(rRowInfo.nDocIndex), mpTableInfo->GetTab() );
        if ( rColInfo.bIsHeader || rRowInfo.bIsHeader )
        {
            const bool bRotatedColHeader = rRowInfo.bIsHeader;
            const bool bRotatedRowHeader = rColInfo.bIsHeader;
            rtl::Reference<ScAccessiblePreviewHeaderCell> pHeaderCell(new ScAccessiblePreviewHeaderCell(this, mpViewShell, aCellPos,
                                        bRotatedColHeader, bRotatedRowHeader, nNewIndex));
            xRet = pHeaderCell.get();
            pHeaderCell->Init();
        }
        else
        {
            rtl::Reference<ScAccessiblePreviewCell> pCell(new ScAccessiblePreviewCell( this, mpViewShell, aCellPos, nNewIndex ));
            xRet = pCell.get();
            pCell->Init();
        }
    }

    if ( !xRet.is() )
        throw lang::IndexOutOfBoundsException();

    return xRet;
}

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewTable::getAccessibleCaption()
{
    //! missing
    return nullptr;
}

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewTable::getAccessibleSummary()
{
    //! missing
    return nullptr;
}

sal_Bool SAL_CALL ScAccessiblePreviewTable::isAccessibleSelected( sal_Int32 nRow, sal_Int32 nColumn )
{
    //  in the page preview, there is no selection
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    if ( !mpTableInfo || nColumn < 0 || nRow < 0 || nColumn >= mpTableInfo->GetCols() || nRow >= mpTableInfo->GetRows() )
        throw lang::IndexOutOfBoundsException();

    //  index iterates horizontally
    return false;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleIndex( sal_Int32 nRow, sal_Int32 nColumn )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    if ( !mpTableInfo || nColumn < 0 || nRow < 0 || nColumn >= mpTableInfo->GetCols() || nRow >= mpTableInfo->GetRows() )
        throw lang::IndexOutOfBoundsException();

    //  index iterates horizontally
    sal_Int32 nRet = nRow * mpTableInfo->GetCols() + nColumn;
    return nRet;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleRow( sal_Int32 nChildIndex )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    if ( !mpTableInfo || nChildIndex < 0 || nChildIndex >= static_cast<sal_Int32>(mpTableInfo->GetRows()) * mpTableInfo->GetCols() )
        throw lang::IndexOutOfBoundsException();

    sal_Int32 nRow = nChildIndex / mpTableInfo->GetCols();
    return nRow;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleColumn( sal_Int32 nChildIndex )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    if ( !mpTableInfo || nChildIndex < 0 || nChildIndex >= static_cast<sal_Int32>(mpTableInfo->GetRows()) * mpTableInfo->GetCols() )
        throw lang::IndexOutOfBoundsException();

    sal_Int32 nCol = nChildIndex % static_cast<sal_Int32>(mpTableInfo->GetCols());
    return nCol;
}

//=====  XAccessibleComponent  ============================================

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewTable::getAccessibleAtPoint( const awt::Point& aPoint )
{
    uno::Reference<XAccessible> xRet;
    if (containsPoint(aPoint))
    {
        SolarMutexGuard aGuard;
        IsObjectValid();

        FillTableInfo();

        if ( mpTableInfo )
        {
            SCCOL nCols = mpTableInfo->GetCols();
            SCROW nRows = mpTableInfo->GetRows();
            const ScPreviewColRowInfo* pColInfo = mpTableInfo->GetColInfo();
            const ScPreviewColRowInfo* pRowInfo = mpTableInfo->GetRowInfo();

            tools::Rectangle aScreenRect(GetBoundingBox());

            awt::Point aMovedPoint = aPoint;
            aMovedPoint.X += aScreenRect.Left();
            aMovedPoint.Y += aScreenRect.Top();

            if ( nCols > 0 && nRows > 0 && aMovedPoint.X >= pColInfo[0].nPixelStart && aMovedPoint.Y >= pRowInfo[0].nPixelStart )
            {
                SCCOL nColIndex = 0;
                while ( nColIndex < nCols && aMovedPoint.X > pColInfo[nColIndex].nPixelEnd )
                    ++nColIndex;
                SCROW nRowIndex = 0;
                while ( nRowIndex < nRows && aMovedPoint.Y > pRowInfo[nRowIndex].nPixelEnd )
                    ++nRowIndex;
                if ( nColIndex < nCols && nRowIndex < nRows )
                {
                    try
                    {
                        xRet = getAccessibleCellAt( nRowIndex, nColIndex );
                    }
                    catch (uno::Exception&)
                    {
                    }
                }
            }
        }
    }

    return xRet;
}

void SAL_CALL ScAccessiblePreviewTable::grabFocus()
{
    SolarMutexGuard aGuard;
    IsObjectValid();
    if (getAccessibleParent().is())
    {
        uno::Reference<XAccessibleComponent> xAccessibleComponent(getAccessibleParent()->getAccessibleContext(), uno::UNO_QUERY);
        if (xAccessibleComponent.is())
            xAccessibleComponent->grabFocus();
    }
}

//=====  XAccessibleContext  ==============================================

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleChildCount()
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    tools::Long nRet = 0;
    if ( mpTableInfo )
        nRet = static_cast<sal_Int32>(mpTableInfo->GetCols()) * mpTableInfo->GetRows();
    return nRet;
}

uno::Reference< XAccessible > SAL_CALL ScAccessiblePreviewTable::getAccessibleChild( sal_Int32 nIndex )
{
    SolarMutexGuard aGuard;
    IsObjectValid();

    FillTableInfo();

    uno::Reference<XAccessible> xRet;
    if ( mpTableInfo )
    {
        sal_Int32 nColumns = mpTableInfo->GetCols();
        if ( nColumns > 0 )
        {
            // nCol, nRow are within the visible table, not the document
            sal_Int32 nCol = nIndex % nColumns;
            sal_Int32 nRow = nIndex / nColumns;

            xRet = getAccessibleCellAt( nRow, nCol );
        }
    }

    if ( !xRet.is() )
        throw lang::IndexOutOfBoundsException();

    return xRet;
}

sal_Int32 SAL_CALL ScAccessiblePreviewTable::getAccessibleIndexInParent()
{
    return mnIndex;
}

uno::Reference< XAccessibleStateSet > SAL_CALL ScAccessiblePreviewTable::getAccessibleStateSet()
{
    SolarMutexGuard aGuard;
    uno::Reference<XAccessibleStateSet> xParentStates;
    if (getAccessibleParent().is())
    {
        uno::Reference<XAccessibleContext> xParentContext = getAccessibleParent()->getAccessibleContext();
        xParentStates = xParentContext->getAccessibleStateSet();
    }
    rtl::Reference<utl::AccessibleStateSetHelper> pStateSet = new utl::AccessibleStateSetHelper();
    if (IsDefunc(xParentStates))
        pStateSet->AddState(AccessibleStateType::DEFUNC);
    else
    {
        pStateSet->AddState(AccessibleStateType::MANAGES_DESCENDANTS);
        pStateSet->AddState(AccessibleStateType::ENABLED);
        pStateSet->AddState(AccessibleStateType::OPAQUE);
        if (isShowing())
            pStateSet->AddState(AccessibleStateType::SHOWING);
        if (isVisible())
            pStateSet->AddState(AccessibleStateType::VISIBLE);
    }
    return pStateSet;
}

//=====  XServiceInfo  ====================================================

OUString SAL_CALL ScAccessiblePreviewTable::getImplementationName()
{
    return "ScAccessiblePreviewTable";
}

uno::Sequence<OUString> SAL_CALL ScAccessiblePreviewTable::getSupportedServiceNames()
{
    uno::Sequence< OUString > aSequence = ScAccessibleContextBase::getSupportedServiceNames();
    sal_Int32 nOldSize(aSequence.getLength());
    aSequence.realloc(nOldSize + 1);

    aSequence.getArray()[nOldSize] = "com.sun.star.table.AccessibleTableView";

    return aSequence;
}

//=====  XTypeProvider  ===================================================

uno::Sequence< uno::Type > SAL_CALL ScAccessiblePreviewTable::getTypes()
{
    return comphelper::concatSequences(ScAccessiblePreviewTableImpl::getTypes(), ScAccessibleContextBase::getTypes());
}

uno::Sequence<sal_Int8> SAL_CALL ScAccessiblePreviewTable::getImplementationId()
{
    return css::uno::Sequence<sal_Int8>();
}

//====  internal  =========================================================

OUString ScAccessiblePreviewTable::createAccessibleDescription()
{
    return STR_ACC_TABLE_DESCR;
}

OUString ScAccessiblePreviewTable::createAccessibleName()
{
    OUString sName(ScResId(STR_ACC_TABLE_NAME));

    if (mpViewShell)
    {
        FillTableInfo();

        if ( mpTableInfo )
        {
            OUString sCoreName;
            if (mpViewShell->GetDocument().GetName( mpTableInfo->GetTab(), sCoreName ))
                sName = sName.replaceFirst("%1", sCoreName);
        }
    }

    return sName;
}

tools::Rectangle ScAccessiblePreviewTable::GetBoundingBoxOnScreen() const
{
    tools::Rectangle aCellRect(GetBoundingBox());
    if (mpViewShell)
    {
        vcl::Window* pWindow = mpViewShell->GetWindow();
        if (pWindow)
        {
            tools::Rectangle aRect = pWindow->GetWindowExtentsRelative(nullptr);
            aCellRect.Move(aRect.Left(), aRect.Top());
        }
    }
    return aCellRect;
}

tools::Rectangle ScAccessiblePreviewTable::GetBoundingBox() const
{
    FillTableInfo();

    tools::Rectangle aRect;
    if ( mpTableInfo )
    {
        SCCOL nColumns = mpTableInfo->GetCols();
        SCROW nRows = mpTableInfo->GetRows();
        if ( nColumns > 0 && nRows > 0 )
        {
            const ScPreviewColRowInfo* pColInfo = mpTableInfo->GetColInfo();
            const ScPreviewColRowInfo* pRowInfo = mpTableInfo->GetRowInfo();

            aRect = tools::Rectangle( pColInfo[0].nPixelStart,
                               pRowInfo[0].nPixelStart,
                               pColInfo[nColumns-1].nPixelEnd,
                               pRowInfo[nRows-1].nPixelEnd );
        }
    }
    return aRect;
}

bool ScAccessiblePreviewTable::IsDefunc( const uno::Reference<XAccessibleStateSet>& rxParentStates )
{
    return ScAccessibleContextBase::IsDefunc() || (mpViewShell == nullptr) || !getAccessibleParent().is() ||
        (rxParentStates.is() && rxParentStates->contains(AccessibleStateType::DEFUNC));
}

void ScAccessiblePreviewTable::FillTableInfo() const
{
    if ( mpViewShell && !mpTableInfo )
    {
        Size aOutputSize;
        vcl::Window* pWindow = mpViewShell->GetWindow();
        if ( pWindow )
            aOutputSize = pWindow->GetOutputSizePixel();
        tools::Rectangle aVisRect( Point(), aOutputSize );

        mpTableInfo.reset( new ScPreviewTableInfo );
        mpViewShell->GetLocationData().GetTableInfo( aVisRect, *mpTableInfo );
    }
}

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