/* -*- 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 <toolkit/controls/accessiblecontrolcontext.hxx>
#include <unotools/accessiblestatesethelper.hxx>
#include <com/sun/star/awt/XControl.hpp>
#include <com/sun/star/awt/XWindow.hpp>
#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
#include <vcl/svapp.hxx>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <toolkit/helper/vclunohelper.hxx>
#include <vcl/window.hxx>


namespace toolkit
{


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


    //= OAccessibleControlContext


    OAccessibleControlContext::OAccessibleControlContext()
    {
        // nothing to do here, we have a late ctor
    }


    OAccessibleControlContext::~OAccessibleControlContext()
    {
        ensureDisposed();
    }


    IMPLEMENT_FORWARD_XINTERFACE3( OAccessibleControlContext, OAccessibleControlContext_Base, OAccessibleImplementationAccess, OAccessibleControlContext_IBase )
    IMPLEMENT_FORWARD_XTYPEPROVIDER3( OAccessibleControlContext, OAccessibleControlContext_Base, OAccessibleImplementationAccess, OAccessibleControlContext_IBase )
        // (order matters: the first is the class name, the second is the class doing the ref counting)


    void OAccessibleControlContext::Init( const Reference< XAccessible >& _rxCreator )
    {
        OContextEntryGuard aGuard( this );

        // retrieve the model of the control
        OSL_ENSURE( !m_xControlModel.is(), "OAccessibleControlContext::Init: already know a control model....!???" );

        Reference< awt::XControl > xControl( _rxCreator, UNO_QUERY );
        if ( xControl.is() )
            m_xControlModel.set(xControl->getModel(), css::uno::UNO_QUERY);
        OSL_ENSURE( m_xControlModel.is(), "OAccessibleControlContext::Init: invalid creator (no control, or control without model!" );
        if ( !m_xControlModel.is() )
            throw DisposedException();  // caught by the caller (the create method)

        // start listening at the model
        startModelListening();

        // announce the XAccessible to our base class
        OAccessibleControlContext_Base::lateInit( _rxCreator );
    }


    OAccessibleControlContext* OAccessibleControlContext::create( const Reference< XAccessible >& _rxCreator )
    {
        OAccessibleControlContext* pNew = nullptr;
        try
        {
            pNew = new OAccessibleControlContext;
            pNew->Init( _rxCreator );
        }
        catch( const Exception& )
        {
            OSL_FAIL( "OAccessibleControlContext::create: caught an exception from the late ctor!" );
        }
        return pNew;
    }


    void OAccessibleControlContext::startModelListening( )
    {
        Reference< XComponent > xModelComp( m_xControlModel, UNO_QUERY );
        OSL_ENSURE( xModelComp.is(), "OAccessibleControlContext::startModelListening: invalid model!" );
        if ( xModelComp.is() )
            xModelComp->addEventListener( this );
    }


    void OAccessibleControlContext::stopModelListening( )
    {
        Reference< XComponent > xModelComp( m_xControlModel, UNO_QUERY );
        OSL_ENSURE( xModelComp.is(), "OAccessibleControlContext::stopModelListening: invalid model!" );
        if ( xModelComp.is() )
            xModelComp->removeEventListener( this );
    }


    sal_Int32 SAL_CALL OAccessibleControlContext::getAccessibleChildCount(  )
    {
        // we do not have children
        return 0;
    }


    Reference< XAccessible > SAL_CALL OAccessibleControlContext::getAccessibleChild( sal_Int32 )
    {
        // we do not have children
        throw IndexOutOfBoundsException();
    }


    Reference< XAccessible > SAL_CALL OAccessibleControlContext::getAccessibleParent(  )
    {
        return Reference< XAccessible >();
    }


    sal_Int16 SAL_CALL OAccessibleControlContext::getAccessibleRole(  )
    {
        return AccessibleRole::SHAPE;
    }


    OUString SAL_CALL OAccessibleControlContext::getAccessibleDescription(  )
    {
        OContextEntryGuard aGuard( this );
        return getModelStringProperty( "HelpText" );
    }


    OUString SAL_CALL OAccessibleControlContext::getAccessibleName(  )
    {
        OContextEntryGuard aGuard( this );
        return getModelStringProperty( "Name" );
    }


    Reference< XAccessibleRelationSet > SAL_CALL OAccessibleControlContext::getAccessibleRelationSet(  )
    {
        return nullptr;
    }


    Reference< XAccessibleStateSet > SAL_CALL OAccessibleControlContext::getAccessibleStateSet(  )
    {
        ::osl::MutexGuard aGuard( GetMutex() );
            // no OContextEntryGuard here, as we do not want to throw an exception in case we're not alive anymore

        ::utl::AccessibleStateSetHelper* pStateSet = nullptr;
        if ( isAlive() )
        {
            // no own states, only the ones which are foreign controlled
            pStateSet = new ::utl::AccessibleStateSetHelper( 0 );
        }
        else
        {   // only the DEFUNC state if we're already disposed
            pStateSet = new ::utl::AccessibleStateSetHelper;
            pStateSet->AddState( AccessibleStateType::DEFUNC );
        }
        return pStateSet;
    }


    void SAL_CALL OAccessibleControlContext::disposing( const EventObject& _rSource )
    {
        OSL_ENSURE( Reference< XPropertySet >( _rSource.Source, UNO_QUERY ).get() == m_xControlModel.get(),
            "OAccessibleControlContext::disposing: where did this come from?" );

        stopModelListening( );
        m_xControlModel.clear();
        m_xModelPropsInfo.clear();

        OAccessibleControlContext_Base::disposing();
    }


    OUString OAccessibleControlContext::getModelStringProperty( const sal_Char* _pPropertyName )
    {
        OUString sReturn;
        try
        {
            if ( !m_xModelPropsInfo.is() && m_xControlModel.is() )
                m_xModelPropsInfo = m_xControlModel->getPropertySetInfo();

            OUString sPropertyName( OUString::createFromAscii( _pPropertyName ) );
            if ( m_xModelPropsInfo.is() && m_xModelPropsInfo->hasPropertyByName( sPropertyName ) )
                m_xControlModel->getPropertyValue( sPropertyName ) >>= sReturn;
        }
        catch( const Exception& )
        {
            OSL_FAIL( "OAccessibleControlContext::getModelStringProperty: caught an exception!" );
        }
        return sReturn;
    }


    VclPtr< vcl::Window > OAccessibleControlContext::implGetWindow( Reference< awt::XWindow >* _pxUNOWindow ) const
    {
        Reference< awt::XControl > xControl( getAccessibleCreator(), UNO_QUERY );
        Reference< awt::XWindow > xWindow;
        if ( xControl.is() )
            xWindow.set(xControl->getPeer(), css::uno::UNO_QUERY);

        VclPtr< vcl::Window > pWindow = xWindow.is() ? VCLUnoHelper::GetWindow( xWindow ) : VclPtr< vcl::Window >();

        if ( _pxUNOWindow )
            *_pxUNOWindow = xWindow;

        return pWindow;
    }


    awt::Rectangle OAccessibleControlContext::implGetBounds(  )
    {
        SolarMutexGuard aSolarGuard;
            // want to do some VCL stuff here ...
        OContextEntryGuard aGuard( this );

        OSL_FAIL( "OAccessibleControlContext::implGetBounds: performance issue: forced to calc the size myself!" );
        // In design mode (and this is what this class is for), the surrounding shape (if any) should handle this call
        // The problem is that in design mode, our size may not be correct (in the drawing layer, controls are
        // positioned/sized for painting only), and that calculation of our position is expensive

        // what we know (or can obtain from somewhere):
        // * the PosSize of our peer, relative to its parent window
        // * the parent window which the PosSize is relative to
        // * our foreign controlled accessible parent
        // from this info, we can determine the position of our peer relative to the foreign parent

        // our control
        Reference< awt::XWindow > xWindow;
        VclPtr< vcl::Window > pVCLWindow = implGetWindow( &xWindow );

        awt::Rectangle aBounds( 0, 0, 0, 0 );
        if ( xWindow.is() )
        {
            // ugly, but .... though the XWindow has a getPosSize, it is impossible to determine the
            // parent which this position/size is relative to. This means we must tunnel UNO and ask the
            // implementation
            vcl::Window* pVCLParent = pVCLWindow ? pVCLWindow->GetParent() : nullptr;

            // the relative location of the window
            ::Point aWindowRelativePos( 0, 0);
            if ( pVCLWindow )
                aWindowRelativePos = pVCLWindow->GetPosPixel();

            // the screen position of the "window parent" of the control
            ::Point aVCLParentScreenPos( 0, 0 );
            if ( pVCLParent )
                aVCLParentScreenPos = pVCLParent->GetPosPixel();

            // now the size of the control
            aBounds = xWindow->getPosSize();

            // correct the pos
            aBounds.X = aWindowRelativePos.X() + aVCLParentScreenPos.X();
            aBounds.Y = aWindowRelativePos.Y() + aVCLParentScreenPos.Y();
        }

        return aBounds;
    }


    Reference< XAccessible > SAL_CALL OAccessibleControlContext::getAccessibleAtPoint( const awt::Point& /* _rPoint */ )
    {
        // no children at all
        return nullptr;
    }


    void SAL_CALL OAccessibleControlContext::grabFocus(  )
    {
        OSL_FAIL( "OAccessibleControlContext::grabFocus: !isFocusTraversable, but grabFocus!" );
    }


    sal_Int32 SAL_CALL OAccessibleControlContext::getForeground(  )
    {
        SolarMutexGuard aSolarGuard;
            // want to do some VCL stuff here ...
        OContextEntryGuard aGuard( this );

        VclPtr< vcl::Window > pWindow = implGetWindow();
        Color nColor;
        if ( pWindow )
        {
            if ( pWindow->IsControlForeground() )
                nColor = pWindow->GetControlForeground();
            else
            {
                vcl::Font aFont;
                if ( pWindow->IsControlFont() )
                    aFont = pWindow->GetControlFont();
                else
                    aFont = pWindow->GetFont();
                nColor = aFont.GetColor();
            }
        }
        return sal_Int32(nColor);
    }


    sal_Int32 SAL_CALL OAccessibleControlContext::getBackground(  )
    {
        SolarMutexGuard aSolarGuard;
            // want to do some VCL stuff here ...
        OContextEntryGuard aGuard( this );

        VclPtr< vcl::Window > pWindow = implGetWindow();
        Color nColor;
        if ( pWindow )
        {
            if ( pWindow->IsControlBackground() )
                nColor = pWindow->GetControlBackground();
            else
                nColor = pWindow->GetBackground().GetColor();
        }

        return sal_Int32(nColor);
    }


}   //namespace toolkit


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