/**************************************************************
 * 
 * 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.
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 *************************************************************/



// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_accessibility.hxx"
#include <accessibility/standard/vclxaccessibletabcontrol.hxx>
#include <accessibility/standard/vclxaccessibletabpage.hxx>

#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <unotools/accessiblestatesethelper.hxx>
#include <vcl/tabctrl.hxx>
#include <vcl/tabpage.hxx>

#include <vector>

using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::accessibility;
using namespace ::comphelper;


//	----------------------------------------------------
//	class VCLXAccessibleTabControl
//	----------------------------------------------------

VCLXAccessibleTabControl::VCLXAccessibleTabControl( VCLXWindow* pVCLXWindow )
	:VCLXAccessibleComponent( pVCLXWindow )
{
	m_pTabControl = static_cast< TabControl* >( GetWindow() );

	if ( m_pTabControl )
		m_aAccessibleChildren.assign( m_pTabControl->GetPageCount(), Reference< XAccessible >() );
}

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

VCLXAccessibleTabControl::~VCLXAccessibleTabControl()
{
}

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

void VCLXAccessibleTabControl::UpdateFocused()
{
	for ( sal_uInt32 i = 0; i < m_aAccessibleChildren.size(); ++i )
	{
		Reference< XAccessible > xChild( m_aAccessibleChildren[i] );
		if ( xChild.is() )
		{
			VCLXAccessibleTabPage* pVCLXAccessibleTabPage = static_cast< VCLXAccessibleTabPage* >( xChild.get() );
			if ( pVCLXAccessibleTabPage )
				pVCLXAccessibleTabPage->SetFocused( pVCLXAccessibleTabPage->IsFocused() );
		}
	}
}

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

void VCLXAccessibleTabControl::UpdateSelected( sal_Int32 i, bool bSelected )
{
	// IAccessible2 implementation, 2009
	//NotifyAccessibleEvent( AccessibleEventId::SELECTION_CHANGED, Any(), Any() );

	if ( i >= 0 && i < (sal_Int32)m_aAccessibleChildren.size() )
	{
		Reference< XAccessible > xChild( m_aAccessibleChildren[i] );
		if ( xChild.is() )
		{
			VCLXAccessibleTabPage* pVCLXAccessibleTabPage = static_cast< VCLXAccessibleTabPage* >( xChild.get() );
			if ( pVCLXAccessibleTabPage )
				pVCLXAccessibleTabPage->SetSelected( bSelected );
		}
	}
}

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

void VCLXAccessibleTabControl::UpdatePageText( sal_Int32 i )
{
    if ( i >= 0 && i < (sal_Int32)m_aAccessibleChildren.size() )
    {
        Reference< XAccessible > xChild( m_aAccessibleChildren[i] );
        if ( xChild.is() )
        {
            VCLXAccessibleTabPage* pVCLXAccessibleTabPage = static_cast< VCLXAccessibleTabPage* >( xChild.get() );
            if ( pVCLXAccessibleTabPage )
                pVCLXAccessibleTabPage->SetPageText( pVCLXAccessibleTabPage->GetPageText() );
        }
    }
}

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

void VCLXAccessibleTabControl::UpdateTabPage( sal_Int32 i, bool bNew )
{
	if ( i >= 0 && i < (sal_Int32)m_aAccessibleChildren.size() )
	{
		Reference< XAccessible > xChild( m_aAccessibleChildren[i] );
		if ( xChild.is() )
		{
			VCLXAccessibleTabPage* pVCLXAccessibleTabPage = static_cast< VCLXAccessibleTabPage* >( xChild.get() );
			if ( pVCLXAccessibleTabPage )
				pVCLXAccessibleTabPage->Update( bNew );
		}
	}
}

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

void VCLXAccessibleTabControl::InsertChild( sal_Int32 i )
{
	if ( i >= 0 && i <= (sal_Int32)m_aAccessibleChildren.size() )
	{
		// insert entry in child list
		m_aAccessibleChildren.insert( m_aAccessibleChildren.begin() + i, Reference< XAccessible >() );

		// send accessible child event
		Reference< XAccessible > xChild( getAccessibleChild( i ) );
		if ( xChild.is() )
		{
			Any aOldValue, aNewValue;
			aNewValue <<= xChild;
			NotifyAccessibleEvent( AccessibleEventId::CHILD, aOldValue, aNewValue );
		}
	}
}

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

void VCLXAccessibleTabControl::RemoveChild( sal_Int32 i )
{
	if ( i >= 0 && i < (sal_Int32)m_aAccessibleChildren.size() )
	{
		// get the accessible of the removed page
		Reference< XAccessible > xChild( m_aAccessibleChildren[i] );

		// remove entry in child list
		m_aAccessibleChildren.erase( m_aAccessibleChildren.begin() + i );

		// send accessible child event
		if ( xChild.is() )
		{
			Any aOldValue, aNewValue;
			aOldValue <<= xChild;
			NotifyAccessibleEvent( AccessibleEventId::CHILD, aOldValue, aNewValue );

			Reference< XComponent > xComponent( xChild, UNO_QUERY );
			if ( xComponent.is() )
				xComponent->dispose();
		}
	}
}

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

void VCLXAccessibleTabControl::ProcessWindowEvent( const VclWindowEvent& rVclWindowEvent )
{
    switch ( rVclWindowEvent.GetId() )
    {
		case VCLEVENT_TABPAGE_ACTIVATE:
		case VCLEVENT_TABPAGE_DEACTIVATE:
        {
			if ( m_pTabControl )
			{
                sal_uInt16 nPageId = (sal_uInt16)(sal_IntPtr) rVclWindowEvent.GetData();
				sal_uInt16 nPagePos = m_pTabControl->GetPagePos( nPageId );
                UpdateFocused();
				UpdateSelected( nPagePos, rVclWindowEvent.GetId() == VCLEVENT_TABPAGE_ACTIVATE );
			}
        }
        break;
		case VCLEVENT_TABPAGE_PAGETEXTCHANGED:
        {
			if ( m_pTabControl )
			{
                sal_uInt16 nPageId = (sal_uInt16)(sal_IntPtr) rVclWindowEvent.GetData();
				sal_uInt16 nPagePos = m_pTabControl->GetPagePos( nPageId );
				UpdatePageText( nPagePos );
			}
        }
        break;
		case VCLEVENT_TABPAGE_INSERTED:
        {
			if ( m_pTabControl )
			{
                sal_uInt16 nPageId = (sal_uInt16)(sal_IntPtr) rVclWindowEvent.GetData();
				sal_uInt16 nPagePos = m_pTabControl->GetPagePos( nPageId );
				InsertChild( nPagePos );
			}
        }
        break;
		case VCLEVENT_TABPAGE_REMOVED:
        {
			if ( m_pTabControl )
			{
                sal_uInt16 nPageId = (sal_uInt16)(sal_IntPtr) rVclWindowEvent.GetData();
				for ( sal_Int32 i = 0, nCount = getAccessibleChildCount(); i < nCount; ++i )
				{
					Reference< XAccessible > xChild( getAccessibleChild( i ) );
					if ( xChild.is() )
					{
						VCLXAccessibleTabPage* pVCLXAccessibleTabPage = static_cast< VCLXAccessibleTabPage* >( xChild.get() );
						if ( pVCLXAccessibleTabPage && pVCLXAccessibleTabPage->GetPageId() == nPageId )
						{
							RemoveChild( i );
							break;
						}
					}
				}
			}
        }
        break;
		case VCLEVENT_TABPAGE_REMOVEDALL:
        {
			for ( sal_Int32 i = m_aAccessibleChildren.size() - 1; i >= 0; --i )
				RemoveChild( i );
        }
        break;
		case VCLEVENT_WINDOW_GETFOCUS:
		case VCLEVENT_WINDOW_LOSEFOCUS:
        {
            UpdateFocused();
        }
        break;
		case VCLEVENT_OBJECT_DYING:
        {
			if ( m_pTabControl )
			{
				m_pTabControl = NULL;

				// dispose all tab pages
				for ( sal_uInt32 i = 0; i < m_aAccessibleChildren.size(); ++i )
				{
					Reference< XComponent > xComponent( m_aAccessibleChildren[i], UNO_QUERY );
					if ( xComponent.is() )
						xComponent->dispose();
				}
				m_aAccessibleChildren.clear();		
			}

			VCLXAccessibleComponent::ProcessWindowEvent( rVclWindowEvent );
        }
        break;
		default:
			VCLXAccessibleComponent::ProcessWindowEvent( rVclWindowEvent );
   }
}

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

void VCLXAccessibleTabControl::ProcessWindowChildEvent( const VclWindowEvent& rVclWindowEvent )
{
	switch ( rVclWindowEvent.GetId() )
	{
		case VCLEVENT_WINDOW_SHOW:
        case VCLEVENT_WINDOW_HIDE:
        {
            if ( m_pTabControl )
            {
			    Window* pChild = static_cast< Window* >( rVclWindowEvent.GetData() );
			    if ( pChild && pChild->GetType() == WINDOW_TABPAGE )
			    {
                    for ( sal_Int32 i = 0, nCount = m_pTabControl->GetPageCount(); i < nCount; ++i )
                    {
                        sal_uInt16 nPageId = m_pTabControl->GetPageId( (sal_uInt16)i );
		                TabPage* pTabPage = m_pTabControl->GetTabPage( nPageId );
                        if ( pTabPage == (TabPage*) pChild )
                            UpdateTabPage( i, rVclWindowEvent.GetId() == VCLEVENT_WINDOW_SHOW );
                    }
                }
            }
        }
        break;
		default:
			VCLXAccessibleComponent::ProcessWindowChildEvent( rVclWindowEvent );
	}
}


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

void VCLXAccessibleTabControl::FillAccessibleStateSet( utl::AccessibleStateSetHelper& rStateSet )
{
	VCLXAccessibleComponent::FillAccessibleStateSet( rStateSet );

	if ( m_pTabControl )
		rStateSet.AddState( AccessibleStateType::FOCUSABLE );
}

// -----------------------------------------------------------------------------
// XInterface
// -----------------------------------------------------------------------------

IMPLEMENT_FORWARD_XINTERFACE2( VCLXAccessibleTabControl, VCLXAccessibleComponent, VCLXAccessibleTabControl_BASE )

// -----------------------------------------------------------------------------
// XTypeProvider
// -----------------------------------------------------------------------------

IMPLEMENT_FORWARD_XTYPEPROVIDER2( VCLXAccessibleTabControl, VCLXAccessibleComponent, VCLXAccessibleTabControl_BASE )

// -----------------------------------------------------------------------------
// XComponent
// -----------------------------------------------------------------------------

void VCLXAccessibleTabControl::disposing()
{
	VCLXAccessibleComponent::disposing();

	if ( m_pTabControl )
	{
		m_pTabControl = NULL;

		// dispose all tab pages
		for ( sal_uInt32 i = 0; i < m_aAccessibleChildren.size(); ++i )
		{
			Reference< XComponent > xComponent( m_aAccessibleChildren[i], UNO_QUERY );
			if ( xComponent.is() )
				xComponent->dispose();
		}
		m_aAccessibleChildren.clear();		
	}
}

// -----------------------------------------------------------------------------
// XServiceInfo
// -----------------------------------------------------------------------------

::rtl::OUString VCLXAccessibleTabControl::getImplementationName() throw (RuntimeException)
{
	return ::rtl::OUString::createFromAscii( "com.sun.star.comp.toolkit.AccessibleTabControl" );
}

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

Sequence< ::rtl::OUString > VCLXAccessibleTabControl::getSupportedServiceNames() throw (RuntimeException)
{
	Sequence< ::rtl::OUString > aNames(1);
	aNames[0] = ::rtl::OUString::createFromAscii( "com.sun.star.awt.AccessibleTabControl" );
	return aNames;
}

// -----------------------------------------------------------------------------
// XAccessibleContext
// -----------------------------------------------------------------------------

sal_Int32 VCLXAccessibleTabControl::getAccessibleChildCount() throw (RuntimeException)
{
	OExternalLockGuard aGuard( this );

	return m_aAccessibleChildren.size(); 
}

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

Reference< XAccessible > VCLXAccessibleTabControl::getAccessibleChild( sal_Int32 i ) throw (IndexOutOfBoundsException, RuntimeException)
{
	OExternalLockGuard aGuard( this );

	if ( i < 0 || i >= getAccessibleChildCount() )
		throw IndexOutOfBoundsException();

	Reference< XAccessible > xChild = m_aAccessibleChildren[i];
	if ( !xChild.is() )
	{
		if ( m_pTabControl )
		{
			sal_uInt16 nPageId = m_pTabControl->GetPageId( (sal_uInt16)i );

			xChild = new VCLXAccessibleTabPage( m_pTabControl, nPageId );

			// insert into tab page list
			m_aAccessibleChildren[i] = xChild;
		}
	}

    return xChild;
}

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

sal_Int16 VCLXAccessibleTabControl::getAccessibleRole(  ) throw (RuntimeException)
{
	OExternalLockGuard aGuard( this );

	return AccessibleRole::PAGE_TAB_LIST;
}

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

::rtl::OUString VCLXAccessibleTabControl::getAccessibleName(  ) throw (RuntimeException)
{
	OExternalLockGuard aGuard( this );

	return ::rtl::OUString();
}

// -----------------------------------------------------------------------------
// XAccessibleSelection
// -----------------------------------------------------------------------------

void VCLXAccessibleTabControl::selectAccessibleChild( sal_Int32 nChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	OExternalLockGuard aGuard( this );

	if ( nChildIndex < 0 || nChildIndex >= getAccessibleChildCount() )
		throw IndexOutOfBoundsException();

	if ( m_pTabControl )
		m_pTabControl->SelectTabPage( m_pTabControl->GetPageId( (sal_uInt16)nChildIndex ) );
}

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

sal_Bool VCLXAccessibleTabControl::isAccessibleChildSelected( sal_Int32 nChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{	
    OExternalLockGuard aGuard( this );

    if ( nChildIndex < 0 || nChildIndex >= getAccessibleChildCount() )
        throw IndexOutOfBoundsException();

    sal_Bool bSelected = sal_False;
    if ( m_pTabControl && m_pTabControl->GetCurPageId() == m_pTabControl->GetPageId( (sal_uInt16)nChildIndex ) )
        bSelected = sal_True;

    return bSelected;
}

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

void VCLXAccessibleTabControl::clearAccessibleSelection(  ) throw (RuntimeException)
{
	// This method makes no sense in a tab control, and so does nothing.
}

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

void VCLXAccessibleTabControl::selectAllAccessibleChildren(  ) throw (RuntimeException)
{
	OExternalLockGuard aGuard( this );

	selectAccessibleChild( 0 );
}

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

sal_Int32 VCLXAccessibleTabControl::getSelectedAccessibleChildCount(  ) throw (RuntimeException)
{
	OExternalLockGuard aGuard( this );

	return 1;
}

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

Reference< XAccessible > VCLXAccessibleTabControl::getSelectedAccessibleChild( sal_Int32 nSelectedChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	OExternalLockGuard aGuard( this );

	if ( nSelectedChildIndex < 0 || nSelectedChildIndex >= getSelectedAccessibleChildCount() )
		throw IndexOutOfBoundsException();

	Reference< XAccessible > xChild;

	for ( sal_Int32 i = 0, j = 0, nCount = getAccessibleChildCount(); i < nCount; i++ )
	{		
		if ( isAccessibleChildSelected( i ) && ( j++ == nSelectedChildIndex ) )
		{
			xChild = getAccessibleChild( i );
			break;
		}
	}

	return xChild;
}

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

void VCLXAccessibleTabControl::deselectAccessibleChild( sal_Int32 nChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	OExternalLockGuard aGuard( this );

	if ( nChildIndex < 0 || nChildIndex >= getAccessibleChildCount() )
		throw IndexOutOfBoundsException();

	// This method makes no sense in a tab control, and so does nothing.
}

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