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


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_slideshow.hxx"

// must be first
#include <canvas/debug.hxx>

#include <com/sun/star/awt/Rectangle.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>
#include <com/sun/star/awt/FontWeight.hpp>
#include <rtl/logfile.hxx>

#include <vcl/metaact.hxx>
#include <vcl/gdimtf.hxx>

#include <basegfx/numeric/ftools.hxx>

#include <boost/bind.hpp>

#include <cmath> // for trigonometry and fabs
#include <algorithm>
#include <functional>
#include <limits>

#include "backgroundshape.hxx"
#include "slideshowexceptions.hxx"
#include "slideshowcontext.hxx"
#include "gdimtftools.hxx"
#include "shape.hxx"
#include "viewbackgroundshape.hxx"


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


namespace slideshow
{
    namespace internal
    {
        /** Representation of a draw document's background shape.

            This class implements the Shape interface for the
            background shape. Since the background shape is neither
            animatable nor attributable, those more specialized
            derivations of the Shape interface are not implemented
            here.

            @attention this class is to be treated 'final', i.e. one
            should not derive from it.
         */
        class BackgroundShape : public Shape
        {
        public:
            /** Create the background shape.

            	This method creates a shape that handles the
            	peculiarities of the draw API regarding background
            	content.
             */
            BackgroundShape( const ::com::sun::star::uno::Reference< 
                             	::com::sun::star::drawing::XDrawPage >& xDrawPage,
                             const ::com::sun::star::uno::Reference< 
                             	::com::sun::star::drawing::XDrawPage >& xMasterPage,
                             const SlideShowContext&                    rContext ); // throw ShapeLoadFailedException;

            virtual ::com::sun::star::uno::Reference< 
                ::com::sun::star::drawing::XShape > getXShape() const;

            // View layer methods
            //------------------------------------------------------------------

            virtual void addViewLayer( const ViewLayerSharedPtr& 	rNewLayer,
                                       bool							bRedrawLayer );
            virtual bool removeViewLayer( const ViewLayerSharedPtr& rNewLayer );
            virtual bool clearAllViewLayers();


            // attribute methods
            //------------------------------------------------------------------

            virtual ::basegfx::B2DRectangle getBounds() const;
            virtual ::basegfx::B2DRectangle getDomBounds() const;
            virtual ::basegfx::B2DRectangle getUpdateArea() const;
            virtual bool isVisible() const;
            virtual double getPriority() const;
            virtual bool isBackgroundDetached() const;            


            // render methods
            //------------------------------------------------------------------

            virtual bool update() const;
            virtual bool render() const;
            virtual bool isContentChanged() const;
            
        private:
            /// The metafile actually representing the Shape
            GDIMetaFileSharedPtr		mpMtf;

            // The attributes of this Shape
            ::basegfx::B2DRectangle		maBounds; // always needed for rendering

            /// the list of active view shapes (one for each registered view layer)
            typedef ::std::vector< ViewBackgroundShapeSharedPtr > ViewBackgroundShapeVector;
            ViewBackgroundShapeVector	maViewShapes;
        };


        ////////////////////////////////////////////////////////////////////////////////


        BackgroundShape::BackgroundShape( const uno::Reference< drawing::XDrawPage >& xDrawPage,
                                          const uno::Reference< drawing::XDrawPage >& xMasterPage,
                                          const SlideShowContext&                     rContext ) :
            mpMtf(),
            maBounds(),
            maViewShapes()
        {
            uno::Reference< beans::XPropertySet > xPropSet( xDrawPage, 
                                                            uno::UNO_QUERY_THROW );
            GDIMetaFileSharedPtr pMtf( new GDIMetaFile() );

            // first try the page background (overrides
            // masterpage background), then try masterpage
            if( !getMetaFile( uno::Reference<lang::XComponent>(xDrawPage, uno::UNO_QUERY),
                              xDrawPage, *pMtf, MTF_LOAD_BACKGROUND_ONLY,
                              rContext.mxComponentContext ) &&
                !getMetaFile( uno::Reference<lang::XComponent>(xMasterPage, uno::UNO_QUERY),
                              xDrawPage, *pMtf, MTF_LOAD_BACKGROUND_ONLY,
                              rContext.mxComponentContext ))
            {
                throw ShapeLoadFailedException();
            }

            // there is a special background shape, add it
            // as the first one
            // ---------------------------------------------------

            sal_Int32 nDocWidth=0;
            sal_Int32 nDocHeight=0;
            xPropSet->getPropertyValue( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM("Width") ) ) >>= nDocWidth;
            xPropSet->getPropertyValue( ::rtl::OUString( RTL_CONSTASCII_USTRINGPARAM("Height") ) ) >>= nDocHeight;

            mpMtf = pMtf;
            maBounds = ::basegfx::B2DRectangle( 0,0,nDocWidth, nDocHeight );
        }

        uno::Reference< drawing::XShape > BackgroundShape::getXShape() const
        {
            // no real XShape representative
            return uno::Reference< drawing::XShape >();
        }

        void BackgroundShape::addViewLayer( const ViewLayerSharedPtr&	rNewLayer,
                                            bool						bRedrawLayer )
        {
            ViewBackgroundShapeVector::iterator aEnd( maViewShapes.end() );

            // already added?
            if( ::std::find_if( maViewShapes.begin(), 
                                aEnd, 
                                ::boost::bind<bool>( 
                                    ::std::equal_to< ViewLayerSharedPtr >(),
                                    ::boost::bind( &ViewBackgroundShape::getViewLayer,
                                                   _1 ),
                                    ::boost::cref( rNewLayer ) ) ) != aEnd )
            {
                // yes, nothing to do
                return;
            }

            maViewShapes.push_back( 
                ViewBackgroundShapeSharedPtr( 
                    new ViewBackgroundShape( rNewLayer,
                                             maBounds ) ) );

            // render the Shape on the newly added ViewLayer
            if( bRedrawLayer )
                maViewShapes.back()->render( mpMtf );
        }

        bool BackgroundShape::removeViewLayer( const ViewLayerSharedPtr& rLayer )
        {
            const ViewBackgroundShapeVector::iterator aEnd( maViewShapes.end() );

            OSL_ENSURE( ::std::count_if(maViewShapes.begin(), 
                                        aEnd, 
                                        ::boost::bind<bool>( 
                                            ::std::equal_to< ViewLayerSharedPtr >(),
                                            ::boost::bind( &ViewBackgroundShape::getViewLayer,
                                                           _1 ),
                                            ::boost::cref( rLayer ) ) ) < 2,
                        "BackgroundShape::removeViewLayer(): Duplicate ViewLayer entries!" );

            ViewBackgroundShapeVector::iterator aIter;

            if( (aIter=::std::remove_if( maViewShapes.begin(), 
                                         aEnd, 
                                         ::boost::bind<bool>( 
                                             ::std::equal_to< ViewLayerSharedPtr >(),
                                             ::boost::bind( &ViewBackgroundShape::getViewLayer,
                                                            _1 ),
                                             ::boost::cref( rLayer ) ) )) == aEnd )
            {
                // view layer seemingly was not added, failed
                return false;
            }

            // actually erase from container
            maViewShapes.erase( aIter, aEnd );

            return true;
        }

        bool BackgroundShape::clearAllViewLayers()
        {
            maViewShapes.clear();
            return true;
        }

        ::basegfx::B2DRectangle BackgroundShape::getBounds() const
        {
            return maBounds;
        }
        
        ::basegfx::B2DRectangle BackgroundShape::getDomBounds() const
        {
            return maBounds;
        }

        ::basegfx::B2DRectangle BackgroundShape::getUpdateArea() const
        {
            // TODO(F1): Need to expand background, too, when
            // antialiasing?

            // no transformation etc. possible for background shape
            return maBounds;
        }

        bool BackgroundShape::isVisible() const
        {
            return true;
        }

        double BackgroundShape::getPriority() const
        {
        	return 0.0; // lowest prio, we're the background
        }

        bool BackgroundShape::update() const
        {
            return render();
        }

        bool BackgroundShape::render() const
        {
            RTL_LOGFILE_CONTEXT( aLog, "::presentation::internal::BackgroundShape::render()" );
            RTL_LOGFILE_CONTEXT_TRACE1( aLog, "::presentation::internal::BackgroundShape: 0x%X", this );

            // gcc again...
            const ::basegfx::B2DRectangle& rCurrBounds( BackgroundShape::getBounds() );

            if( rCurrBounds.getRange().equalZero() )
            {
                // zero-sized shapes are effectively invisible,
                // thus, we save us the rendering...
                return true;
            }

            // redraw all view shapes, by calling their render() method
            if( ::std::count_if( maViewShapes.begin(),
                                 maViewShapes.end(),                                 
                                 ::boost::bind( &ViewBackgroundShape::render,
                                                _1,
                                                ::boost::cref( mpMtf ) ) )
                != static_cast<ViewBackgroundShapeVector::difference_type>(maViewShapes.size()) )
            {
                // at least one of the ViewBackgroundShape::render() calls did return 
                // false - update failed on at least one ViewLayer
                return false;
            }

            return true;
        }

        bool BackgroundShape::isContentChanged() const
        {
            return false;
        }

        bool BackgroundShape::isBackgroundDetached() const
        {
            return false; // we're not animatable
        }

        //////////////////////////////////////////////////////////

        ShapeSharedPtr createBackgroundShape( 
            const uno::Reference< drawing::XDrawPage >& xDrawPage,
            const uno::Reference< drawing::XDrawPage >& xMasterPage,
            const SlideShowContext&                     rContext )
        {
            return ShapeSharedPtr(
                new BackgroundShape( 
                    xDrawPage,
                    xMasterPage,
                    rContext ));
        }
    }
}