/* -*- 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 <accessibility/accessiblelistbox.hxx>

#include <accessibility/accessiblelistboxentry.hxx>

#include <vcl/toolkit/treelistbox.hxx>

#include <vcl/toolkit/treelistentry.hxx>

#include <com/sun/star/accessibility/AccessibleEventId.hpp>

#include <com/sun/star/accessibility/AccessibleRole.hpp>

#include <com/sun/star/accessibility/AccessibleStateType.hpp>

#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>

#include <comphelper/accessiblecontexthelper.hxx>

// class AccessibleListBox -----------------------------------------------------

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

using namespace ::com::sun::star::uno;

using namespace ::com::sun::star::lang;

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

// Ctor() and Dtor()

AccessibleListBox::AccessibleListBox(SvTreeListBox& _rListBox, const Reference< XAccessible >& _xParent)

    : ImplInheritanceHelper(&_rListBox),

    m_xParent( _xParent )

{

}

AccessibleListBox::~AccessibleListBox()

{

    if ( isAlive() )

    {

        // increment ref count to prevent double call of Dtor

        osl_atomic_increment( &m_refCount );

        dispose();

    }

}

void AccessibleListBox::ProcessWindowEvent( const VclWindowEvent& rVclWindowEvent )

{

    if ( !isAlive() )

        return;

    switch ( rVclWindowEvent.GetId() )

    {

    case  VclEventId::CheckboxToggle :

        {

            if ( !getListBox() || !getListBox()->HasFocus() )

            {

                return;

            }

            AccessibleListBoxEntry* pCurOpEntry = GetCurEventEntry(rVclWindowEvent);

            if(!pCurOpEntry)

            {

                return ;

            }

            uno::Any aValue;

            aValue <<= AccessibleStateType::CHECKED;

            if ( getListBox()->GetCheckButtonState( pCurOpEntry->GetSvLBoxEntry() ) == SvButtonState::Checked )

            {

                pCurOpEntry->NotifyAccessibleEvent( AccessibleEventId::STATE_CHANGED, uno::Any(), aValue );

            }

            else

            {

                pCurOpEntry->NotifyAccessibleEvent( AccessibleEventId::STATE_CHANGED, aValue,uno::Any() );

            }

            break;

        }

    case VclEventId::ListboxSelect :

        {

            OSL_FAIL("Debug: Treelist shouldn't use VclEventId::ListboxSelect");

            break;

        }

    case VclEventId::ListboxTreeSelect:

        {

            if ( getListBox() && getListBox()->HasFocus() )

            {

                if (m_xFocusedEntry.is())

                {

                    m_xFocusedEntry->NotifyAccessibleEvent(AccessibleEventId::SELECTION_CHANGED, Any(), Any());

                }

            }

        }

        break;

    case VclEventId::ListboxTreeFocus:

        {

            VclPtr<SvTreeListBox> pBox = getListBox();

            if( pBox && pBox->HasFocus() )

            {

                uno::Any aNewValue;

                SvTreeListEntry* pEntry = static_cast< SvTreeListEntry* >( rVclWindowEvent.GetData() );

                if ( pEntry )

                {

                    if (m_xFocusedEntry.is() && m_xFocusedEntry->GetSvLBoxEntry() == pEntry)

                    {

                        aNewValue <<= uno::Reference<XAccessible>(m_xFocusedEntry);;

                        NotifyAccessibleEvent( AccessibleEventId::ACTIVE_DESCENDANT_CHANGED, uno::Any(), aNewValue );

                        return ;

                    }

                    uno::Any aOldValue;

                    aOldValue <<= uno::Reference<XAccessible>(m_xFocusedEntry);;

                    m_xFocusedEntry = implGetAccessible(*pEntry);

                    aNewValue <<= uno::Reference<XAccessible>(m_xFocusedEntry);

                    NotifyAccessibleEvent( AccessibleEventId::ACTIVE_DESCENDANT_CHANGED, aOldValue, aNewValue );

                }

                else

                {

                    aNewValue <<= AccessibleStateType::FOCUSED;

                    NotifyAccessibleEvent( AccessibleEventId::STATE_CHANGED, uno::Any(), aNewValue );

                }

            }

        }

        break;

    case VclEventId::ListboxItemRemoved:

        {

            SvTreeListEntry* pEntry = static_cast< SvTreeListEntry* >( rVclWindowEvent.GetData() );

            if ( pEntry )

            {

                RemoveChildEntries(pEntry);

            }

            else

            {

                // NULL means Clear()

                for (auto const& entry : m_mapEntry)

                {

                    uno::Any aNewValue;

                    uno::Any aOldValue;

                    aOldValue <<= uno::Reference<XAccessible>(entry.second);

                    NotifyAccessibleEvent( AccessibleEventId::CHILD, aOldValue, aNewValue );

                }

                for (auto const& entry : m_mapEntry)

                {   // release references ...

                    entry.second->dispose();

                }

                m_mapEntry.clear();

            }

        }

        break;

        // #i92103#

    case VclEventId::ItemExpanded :

    case VclEventId::ItemCollapsed :

        {

            SvTreeListEntry* pEntry = static_cast< SvTreeListEntry* >( rVclWindowEvent.GetData() );

            if ( pEntry )

            {

                rtl::Reference<AccessibleListBoxEntry> const xChild(implGetAccessible(*pEntry));

                const short nAccEvent =

                        ( rVclWindowEvent.GetId() == VclEventId::ItemExpanded )

                        ? AccessibleEventId::LISTBOX_ENTRY_EXPANDED

                        : AccessibleEventId::LISTBOX_ENTRY_COLLAPSED;

                uno::Any aListBoxEntry;

                aListBoxEntry <<= Reference<XAccessible>(xChild);

                NotifyAccessibleEvent( nAccEvent, Any(), aListBoxEntry );

                if ( getListBox() && getListBox()->HasFocus() )

                {

                    NotifyAccessibleEvent( AccessibleEventId::ACTIVE_DESCENDANT_CHANGED, Any(), aListBoxEntry );

                }

            }

        }

        break;

    default:

        VCLXAccessibleComponent::ProcessWindowEvent (rVclWindowEvent);

    }

}

AccessibleListBoxEntry* AccessibleListBox::GetCurEventEntry( const VclWindowEvent& rVclWindowEvent )

{

    SvTreeListEntry* pEntry = static_cast< SvTreeListEntry* >( rVclWindowEvent.GetData() );

    if ( !pEntry )

        pEntry = getListBox()->GetCurEntry();

    if (m_xFocusedEntry.is() && pEntry && pEntry != m_xFocusedEntry->GetSvLBoxEntry())

    {

        AccessibleListBoxEntry *const pAccCurOptionEntry = implGetAccessible(*pEntry).get();

        uno::Any aNewValue;

        aNewValue <<= uno::Reference<XAccessible>(pAccCurOptionEntry);

        NotifyAccessibleEvent( AccessibleEventId::CHILD, uno::Any(), aNewValue );//Add

        return pAccCurOptionEntry;

    }

    else

    {

        return m_xFocusedEntry.get();

    }

}

void AccessibleListBox::RemoveChildEntries(SvTreeListEntry* pEntry)

{

    MAP_ENTRY::iterator mi = m_mapEntry.find(pEntry);

    if ( mi != m_mapEntry.end() )

    {

        uno::Any aNewValue;

        uno::Any aOldValue;

        aOldValue <<= uno::Reference<XAccessible>(mi->second);

        NotifyAccessibleEvent( AccessibleEventId::CHILD, aOldValue, aNewValue );

        m_mapEntry.erase(mi);

    }

    VclPtr<SvTreeListBox> pBox = getListBox();

    SvTreeListEntry* pEntryChild = pBox->FirstChild(pEntry);

    while (pEntryChild)

    {

        RemoveChildEntries(pEntryChild);

        pEntryChild = pEntryChild->NextSibling();

    }

}

// XComponent

void SAL_CALL AccessibleListBox::disposing()

{

    ::osl::MutexGuard aGuard( m_aMutex );

    m_mapEntry.clear();

    VCLXAccessibleComponent::disposing();

    m_xParent = nullptr;

}

// XServiceInfo

OUString SAL_CALL AccessibleListBox::getImplementationName()

{

    return u"com.sun.star.comp.svtools.AccessibleTreeListBox"_ustr;

}

Sequence< OUString > SAL_CALL AccessibleListBox::getSupportedServiceNames()

{

    return {u"com.sun.star.accessibility.AccessibleContext"_ustr,

            u"com.sun.star.accessibility.AccessibleComponent"_ustr,

            u"com.sun.star.awt.AccessibleTreeListBox"_ustr};

}

// XAccessibleContext

sal_Int64 SAL_CALL AccessibleListBox::getAccessibleChildCount(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    sal_Int32 nCount = 0;

    VclPtr<SvTreeListBox> pSvTreeListBox = getListBox();

    if ( pSvTreeListBox )

        nCount = pSvTreeListBox->GetLevelChildCount( nullptr );

    return nCount;

}

Reference< XAccessible > SAL_CALL AccessibleListBox::getAccessibleChild( sal_Int64 i )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    SvTreeListEntry* pEntry = getListBox()->GetEntry(i);

    if ( !pEntry )

        throw IndexOutOfBoundsException();

    // Solution: Set the parameter of the parent to null to let entry determine the parent by itself

    //return new AccessibleListBoxEntry( *getListBox(), pEntry, this );

    //return new AccessibleListBoxEntry( *getListBox(), pEntry, nullptr );

    return implGetAccessible(*pEntry);

}

Reference< XAccessible > SAL_CALL AccessibleListBox::getAccessibleParent(  )

{

    ::osl::MutexGuard aGuard( m_aMutex );

    ensureAlive();

    return m_xParent;

}

sal_Int32 AccessibleListBox::GetRoleType() const

{

    sal_Int32 nCase = 0;

    SvTreeListEntry* pEntry = getListBox()->GetEntry(0);

    if ( pEntry )

    {

        if( pEntry->HasChildrenOnDemand() || getListBox()->GetChildCount(pEntry) > 0  )

        {

            nCase = 1;

            return nCase;

        }

    }

    bool bHasButtons = (getListBox()->GetStyle() & WB_HASBUTTONS)!=0;

    if( !(getListBox()->GetTreeFlags() & SvTreeFlags::CHKBTN) )

    {

        if( bHasButtons )

            nCase = 1;

    }

    else

    {

        if( bHasButtons )

            nCase = 2;

        else

            nCase = 3;

    }

    return nCase;

}

sal_Int16 SAL_CALL AccessibleListBox::getAccessibleRole()

{

    ::comphelper::OExternalLockGuard aGuard( this );

    VclPtr<SvTreeListBox> pListBox = getListBox();

    if (!pListBox)

        return AccessibleRole::LIST;

    //o is: return AccessibleRole::TREE;

    bool bHasButtons = (pListBox->GetStyle() & WB_HASBUTTONS) != 0;

    if (!bHasButtons && (pListBox->GetTreeFlags() & SvTreeFlags::CHKBTN))

        return AccessibleRole::LIST;

    else

        if (GetRoleType() == 0)

            return AccessibleRole::LIST;

        else

        return AccessibleRole::TREE;

}

OUString SAL_CALL AccessibleListBox::getAccessibleDescription(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    return getListBox()->GetAccessibleDescription();

}

OUString SAL_CALL AccessibleListBox::getAccessibleName(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    return getListBox()->GetAccessibleName();

}

// XAccessibleSelection

void SAL_CALL AccessibleListBox::selectAccessibleChild( sal_Int64 nChildIndex )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    SvTreeListEntry* pEntry = getListBox()->GetEntry( nChildIndex );

    if ( !pEntry )

        throw IndexOutOfBoundsException();

    getListBox()->Select( pEntry );

}

sal_Bool SAL_CALL AccessibleListBox::isAccessibleChildSelected( sal_Int64 nChildIndex )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    if (nChildIndex < 0 || nChildIndex >= getAccessibleChildCount())

        throw IndexOutOfBoundsException();

    SvTreeListEntry* pEntry = getListBox()->GetEntry( nChildIndex );

    if ( !pEntry )

        throw IndexOutOfBoundsException();

    return getListBox()->IsSelected( pEntry );

}

void SAL_CALL AccessibleListBox::clearAccessibleSelection(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    sal_Int32 nCount = getListBox()->GetLevelChildCount( nullptr );

    for ( sal_Int32 i = 0; i < nCount; ++i )

    {

        SvTreeListEntry* pEntry = getListBox()->GetEntry( i );

        if ( getListBox()->IsSelected( pEntry ) )

            getListBox()->Select( pEntry, false );

    }

}

void SAL_CALL AccessibleListBox::selectAllAccessibleChildren(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    sal_Int32 nCount = getListBox()->GetLevelChildCount( nullptr );

    for ( sal_Int32 i = 0; i < nCount; ++i )

    {

        SvTreeListEntry* pEntry = getListBox()->GetEntry( i );

        if ( !getListBox()->IsSelected( pEntry ) )

            getListBox()->Select( pEntry );

    }

}

sal_Int64 SAL_CALL AccessibleListBox::getSelectedAccessibleChildCount(  )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    return getListBox()->GetSelectionCount();

}

Reference< XAccessible > SAL_CALL AccessibleListBox::getSelectedAccessibleChild( sal_Int64 nSelectedChildIndex )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    if ( nSelectedChildIndex < 0 || nSelectedChildIndex >= getSelectedAccessibleChildCount() )

        throw IndexOutOfBoundsException();

    Reference< XAccessible > xChild;

    sal_Int64 nSelCount= 0;

    sal_Int32 nCount = getListBox()->GetLevelChildCount( nullptr );

    for ( sal_Int32 i = 0; i < nCount; ++i )

    {

        SvTreeListEntry* pEntry = getListBox()->GetEntry( i );

        if ( getListBox()->IsSelected( pEntry ) )

            ++nSelCount;

        if ( nSelCount == ( nSelectedChildIndex + 1 ) )

        {

            // Solution: Set the parameter of the parent to null to let entry determine the parent by itself

            //xChild = new AccessibleListBoxEntry( *getListBox(), pEntry, this );

            //xChild = new AccessibleListBoxEntry( *getListBox(), pEntry, nullptr );

            xChild = implGetAccessible(*pEntry).get();

            break;

        }

    }

    return xChild;

}

void SAL_CALL AccessibleListBox::deselectAccessibleChild( sal_Int64 nSelectedChildIndex )

{

    ::comphelper::OExternalLockGuard aGuard( this );

    SvTreeListEntry* pEntry = getListBox()->GetEntry( nSelectedChildIndex );

    if ( !pEntry )

        throw IndexOutOfBoundsException();

    getListBox()->Select( pEntry, false );

}

void AccessibleListBox::FillAccessibleStateSet( sal_Int64& rStateSet )

{

    VCLXAccessibleComponent::FillAccessibleStateSet( rStateSet );

    if ( getListBox() && isAlive() )

    {

        rStateSet |= AccessibleStateType::FOCUSABLE;

        rStateSet |= AccessibleStateType::MANAGES_DESCENDANTS;

        if ( getListBox()->GetSelectionMode() == SelectionMode::Multiple )

            rStateSet |= AccessibleStateType::MULTI_SELECTABLE;

    }

}

rtl::Reference<AccessibleListBoxEntry> AccessibleListBox::implGetAccessible(SvTreeListEntry & rEntry)

{

    rtl::Reference<AccessibleListBoxEntry> pAccessible;

    auto const it = m_mapEntry.find(&rEntry);

    if (it != m_mapEntry.end())

    {

        pAccessible = it->second;

    }

    else

    {

        pAccessible = new AccessibleListBoxEntry(*getListBox(), rEntry, *this);

        m_mapEntry.emplace(&rEntry, pAccessible);

    }

    assert(pAccessible.is());

    return pAccessible;

}

VclPtr< SvTreeListBox > AccessibleListBox::getListBox() const

{

    return GetAs< SvTreeListBox >();

}

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