/* -*- 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 "slideshowviewimpl.hxx"
#include "slideshowimpl.hxx"
#include <sdpage.hxx>

#include <vcl/svapp.hxx>

#include <com/sun/star/awt/Pointer.hpp>
#include <com/sun/star/awt/XWindow.hpp>
#include <com/sun/star/awt/XWindowPeer.hpp>
#include <com/sun/star/beans/XPropertySet.hpp>

#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>

#include <cppcanvas/vclfactory.hxx>
#include <cppcanvas/basegfxfactory.hxx>
#include <basegfx/utils/canvastools.hxx>

#include <toolkit/helper/vclunohelper.hxx>
#include <comphelper/processfactory.hxx>

using ::com::sun::star::uno::Reference;
using ::com::sun::star::uno::WeakReference;
using ::com::sun::star::uno::Exception;

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

namespace sd
{

void SlideShowViewMouseListeners::notify( std::unique_lock<std::mutex>& rGuard, const WrappedMouseEvent& rEvent )
{
    forEach(rGuard,
        [&rEvent] (const Reference<css::awt::XMouseListener>& rListener)
        {
            switch( rEvent.meType )
            {
                case WrappedMouseEvent::PRESSED:
                    rListener->mousePressed( rEvent.maEvent );
                    break;

                case WrappedMouseEvent::RELEASED:
                    rListener->mouseReleased( rEvent.maEvent );
                    break;

                case WrappedMouseEvent::ENTERED:
                    rListener->mouseEntered( rEvent.maEvent );
                    break;

                case WrappedMouseEvent::EXITED:
                    rListener->mouseExited( rEvent.maEvent );
                    break;
            }
        });
}


void SlideShowViewMouseMotionListeners::notify( std::unique_lock<std::mutex>& rGuard,const WrappedMouseMotionEvent& rEvent )
{
    forEach(rGuard,
        [&rEvent] (const Reference< awt::XMouseMotionListener >&  rListener)
        {
            switch( rEvent.meType )
            {
                case WrappedMouseMotionEvent::DRAGGED:
                    rListener->mouseDragged( rEvent.maEvent );
                    break;

                case WrappedMouseMotionEvent::MOVED:
                    rListener->mouseMoved( rEvent.maEvent );
                    break;
            }
        });
}

// SlideShowView
SlideShowView::SlideShowView( ShowWindow&     rOutputWindow,
                              SdDrawDocument* pDoc,
                              AnimationMode   eAnimationMode,
                              SlideshowImpl*  pSlideShow,
                              bool            bFullScreen )
:   mpCanvas( ::cppcanvas::VCLFactory::createSpriteCanvas( rOutputWindow ) ),
    mxWindow( VCLUnoHelper::GetInterface( &rOutputWindow ), uno::UNO_SET_THROW ),
    mxWindowPeer( mxWindow, uno::UNO_QUERY_THROW ),
    mpSlideShow( pSlideShow ),
    mrOutputWindow( rOutputWindow ),
    mpDoc( pDoc ),
    mbIsMouseMotionListener( false ),
    meAnimationMode( eAnimationMode ),
    mbFirstPaint( true ),
    mbMousePressedEaten( false )
{
    mxWindow->addWindowListener( this );
    mxWindow->addMouseListener( this );

    mxPointer = awt::Pointer::create( ::comphelper::getProcessComponentContext() );

    getTransformation();

    // #i48939# only switch on kind of hacky scroll optimization, when
    // running fullscreen. this minimizes the probability that other
    // windows partially cover the show.
    if( bFullScreen )
    {
        try
        {
            Reference< beans::XPropertySet > xCanvasProps( getCanvas(),
                                                           uno::UNO_QUERY_THROW );
            xCanvasProps->setPropertyValue(u"UnsafeScrolling"_ustr,
                uno::Any( true ) );
        }
        catch( uno::Exception& )
        {
        }
    }

    mTranslationOffset.Width = 0;
    mTranslationOffset.Height = 0;
}

// Dispose all internal references
void SlideShowView::disposing(std::unique_lock<std::mutex>& rGuard)
{
    mpSlideShow = nullptr;

    // deregister listeners
    if( mxWindow.is() )
    {
        mxWindow->removeWindowListener( this );
        mxWindow->removeMouseListener( this );

        if( mbIsMouseMotionListener )
            mxWindow->removeMouseMotionListener( this );
    }

    mpCanvas.reset();
    mxWindow.clear();

    // clear all listener containers
    disposingImpl(rGuard);
}

// Disposing our broadcaster
void SAL_CALL SlideShowView::disposing( const lang::EventObject& )
{
    std::unique_lock aGuard( m_aMutex );

    disposingImpl(aGuard);
}

// Disposing our broadcaster
void SlideShowView::disposingImpl(std::unique_lock<std::mutex>& rGuard)
{
    // notify all listeners that _we_ are going down (send a disposing()),
    // then delete listener containers:
    lang::EventObject const evt( static_cast<OWeakObject *>(this) );
    if (!maViewListeners.empty())
    {
        auto tmp = std::move(maViewListeners);
        rGuard.unlock();
        for( const auto& rxListener : tmp )
        {
            Reference< util::XModifyListener > xListener( rxListener );
            if( xListener.is() )
                xListener->disposing( evt );
        }
        rGuard.lock();
    }
    if (maPaintListeners.getLength(rGuard))
    {
        maPaintListeners.disposeAndClear( rGuard, evt );
        rGuard.lock();
    }
    if (maMouseListeners.getLength(rGuard))
    {
        maMouseListeners.disposeAndClear( rGuard, evt );
        rGuard.lock();
    }
    if (maMouseMotionListeners.getLength(rGuard))
    {
        maMouseMotionListeners.disposeAndClear( rGuard, evt );
        rGuard.lock();
    }
}

void SlideShowView::paint( const awt::PaintEvent& e )
{
    std::unique_lock aGuard( m_aMutex );

    if( mbFirstPaint )
    {
        mbFirstPaint = false;
        SlideshowImpl* pSlideShow = mpSlideShow;
        aGuard.unlock();
        if( pSlideShow )
            pSlideShow->onFirstPaint();
    }
    else
    {
        // Change event source, to enable listeners to match event
        // with view
        awt::PaintEvent aEvent( e );
        aEvent.Source = static_cast< ::cppu::OWeakObject* >( this );
        maPaintListeners.notifyEach( aGuard, &css::awt::XPaintListener::windowPaint, aEvent );
        updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
    }
}

// XSlideShowView methods
Reference< rendering::XSpriteCanvas > SAL_CALL SlideShowView::getCanvas(  )
{
    std::unique_lock aGuard( m_aMutex );

    return mpCanvas ? mpCanvas->getUNOSpriteCanvas() : Reference< rendering::XSpriteCanvas >();
}

void SAL_CALL SlideShowView::clear()
{
    // paint background in black
    std::unique_lock aGuard( m_aMutex );
    SolarMutexGuard aSolarGuard;

    // fill the bounds rectangle in black

    const Size aWindowSize( mrOutputWindow.GetSizePixel() );

    ::basegfx::B2DPolygon aPoly( ::basegfx::utils::createPolygonFromRect(
                                     ::basegfx::B2DRectangle(0.0,0.0,
                                                             aWindowSize.Width(),
                                                             aWindowSize.Height() ) ) );
    ::cppcanvas::PolyPolygonSharedPtr pPolyPoly(
        ::cppcanvas::BaseGfxFactory::createPolyPolygon( mpCanvas, aPoly ) );

    if( pPolyPoly )
    {
        pPolyPoly->setRGBAFillColor( 0x000000FFU );
        pPolyPoly->draw();
    }
}

geometry::IntegerSize2D SAL_CALL SlideShowView::getTranslationOffset( )
{
        return mTranslationOffset;
}

geometry::AffineMatrix2D SAL_CALL SlideShowView::getTransformation(  )
{
    std::unique_lock aGuard( m_aMutex );
    SolarMutexGuard aSolarGuard;

    const Size aTmpSize( mrOutputWindow.GetSizePixel() );

    if (aTmpSize.IsEmpty())
    {
        return geometry::AffineMatrix2D (1,0,0,0,1,0);
    }

    const Size aWindowSize( mrOutputWindow.GetSizePixel() );
    Size aOutputSize( aWindowSize );

    if( meAnimationMode != ANIMATIONMODE_SHOW )
    {
        aOutputSize.setWidth( static_cast<::tools::Long>( aOutputSize.Width() / 1.03 ) );
        aOutputSize.setHeight( static_cast<::tools::Long>( aOutputSize.Height() / 1.03 ) );
    }

    SdPage* pP = mpDoc->GetSdPage( 0, PageKind::Standard );
    Size aPageSize( pP->GetSize() );

    const double page_ratio = static_cast<double>(aPageSize.Width()) / static_cast<double>(aPageSize.Height());
    const double output_ratio = static_cast<double>(aOutputSize.Width()) / static_cast<double>(aOutputSize.Height());

    if( page_ratio > output_ratio )
    {
        aOutputSize.setHeight( ( aOutputSize.Width() * aPageSize.Height() ) / aPageSize.Width() );
    }
    else if( page_ratio < output_ratio )
    {
        aOutputSize.setWidth( ( aOutputSize.Height() * aPageSize.Width() ) / aPageSize.Height() );
    }

    Point aOutputOffset( ( aWindowSize.Width() - aOutputSize.Width() ) >> 1,
                            ( aWindowSize.Height() - aOutputSize.Height() ) >> 1 );

    // Reduce available width by one, as the slides might actually
    // render one pixel wider and higher as aPageSize below specifies
    // (when shapes of page size have visible border lines)
    aOutputSize.AdjustWidth( -1 );
    aOutputSize.AdjustHeight( -1 );

    // Record mTranslationOffset
    mTranslationOffset.Height = aOutputOffset.Y();
    mTranslationOffset.Width = aOutputOffset.X();

    // scale presentation into available window rect (minus 10%); center in the window
    const basegfx::B2DHomMatrix aMatrix(basegfx::utils::createScaleTranslateB2DHomMatrix(
        aOutputSize.Width(), aOutputSize.Height(), aOutputOffset.X(), aOutputOffset.Y()));

    geometry::AffineMatrix2D aRes;

    return ::basegfx::unotools::affineMatrixFromHomMatrix( aRes, aMatrix );
}

void SAL_CALL SlideShowView::addTransformationChangedListener( const Reference< util::XModifyListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (m_bDisposed)
        return;
    WeakReference< util::XModifyListener > xWeak( xListener );
    if( std::find( maViewListeners.begin(), maViewListeners.end(), xWeak ) == maViewListeners.end() )
        maViewListeners.push_back( xWeak );
}

void SAL_CALL SlideShowView::removeTransformationChangedListener( const Reference< util::XModifyListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (m_bDisposed)
        return;
    WeakReference< util::XModifyListener > xWeak( xListener );
    auto aIter( std::find( maViewListeners.begin(), maViewListeners.end(), xWeak ) );
    if( aIter != maViewListeners.end() )
        maViewListeners.erase( aIter );
}

void SAL_CALL SlideShowView::addPaintListener( const Reference< awt::XPaintListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (!m_bDisposed)
        maPaintListeners.addInterface( aGuard, xListener );
}

void SAL_CALL SlideShowView::removePaintListener( const Reference< awt::XPaintListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (!m_bDisposed)
        maPaintListeners.removeInterface( aGuard, xListener );
}

void SAL_CALL SlideShowView::addMouseListener( const Reference< awt::XMouseListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (!m_bDisposed)
        maMouseListeners.addInterface( aGuard, xListener );
}

void SAL_CALL SlideShowView::removeMouseListener( const Reference< awt::XMouseListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (!m_bDisposed)
        maMouseListeners.removeInterface( aGuard, xListener );
}

void SAL_CALL SlideShowView::addMouseMotionListener( const Reference< awt::XMouseMotionListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (m_bDisposed)
        return;

    if( !mbIsMouseMotionListener && mxWindow.is() )
    {
        // delay motion event registration, until we really
        // need it
        mbIsMouseMotionListener = true;
        mxWindow->addMouseMotionListener( this );
    }

    maMouseMotionListeners.addInterface( aGuard, xListener );
}

void SAL_CALL SlideShowView::removeMouseMotionListener( const Reference< awt::XMouseMotionListener >& xListener )
{
    std::unique_lock aGuard( m_aMutex );

    if (!m_bDisposed)
        maMouseMotionListeners.removeInterface( aGuard, xListener );

    // TODO(P1): Might be nice to deregister for mouse motion
    // events, when the last listener is gone.
}

void SAL_CALL SlideShowView::setMouseCursor( sal_Int16 nPointerShape )
{
    std::unique_lock aGuard( m_aMutex );

    // forward to window
    if( mxPointer.is() )
        mxPointer->setType( nPointerShape );

    if( mxWindowPeer.is() )
        mxWindowPeer->setPointer( mxPointer );
}

awt::Rectangle SAL_CALL SlideShowView::getCanvasArea(  )
{
    awt::Rectangle aRectangle;

    if( mxWindow.is() )
        return mxWindow->getPosSize();

    aRectangle.X = aRectangle.Y = aRectangle.Width = aRectangle.Height = 0;

    return aRectangle;
}

void SlideShowView::updateimpl( std::unique_lock<std::mutex>& rGuard, SlideshowImpl* pSlideShow )
{
    if( !pSlideShow )
        return;

    ::rtl::Reference< SlideshowImpl > xKeepAlive( pSlideShow );

    if( mbFirstPaint )
    {
        mbFirstPaint = false;
        SlideshowImpl* pTmpSlideShow = mpSlideShow;
        rGuard.unlock();
        if( pTmpSlideShow )
            pTmpSlideShow->onFirstPaint();
    } else
        rGuard.unlock();

    pSlideShow->startUpdateTimer();
}

// XWindowListener methods
void SAL_CALL SlideShowView::windowResized( const awt::WindowEvent& e )
{
    std::unique_lock aGuard( m_aMutex );

    if (m_bDisposed)
        return;

    if (!maViewListeners.empty())
    {
        // Change event source, to enable listeners to match event
        // with view
        awt::WindowEvent aEvent( e );
        aEvent.Source = static_cast< ::cppu::OWeakObject* >( this );
        auto aIter( maViewListeners.begin() );
        while( aIter != maViewListeners.end() )
        {
            Reference< util::XModifyListener > xListener( *aIter );
            if( xListener.is() )
            {
                aGuard.unlock();
                xListener->modified( aEvent );
                aGuard.lock();
                ++aIter;
            }
            else
            {
                aIter = maViewListeners.erase( aIter );
            }
        }
    }

    updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
}

void SAL_CALL SlideShowView::windowMoved( const awt::WindowEvent& )
{
    // ignored
}

void SAL_CALL SlideShowView::windowShown( const lang::EventObject& )
{
    // ignored
}

void SAL_CALL SlideShowView::windowHidden( const lang::EventObject& )
{
    // ignored
}

// XMouseListener implementation
void SAL_CALL SlideShowView::mousePressed( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    if( mpSlideShow && mpSlideShow->isInputFreezed() )
    {
        mbMousePressedEaten = true;
    }
    else
    {
        mbMousePressedEaten = false;

        // Change event source, to enable listeners to match event
        // with view
        WrappedMouseEvent aEvent;
        aEvent.meType = WrappedMouseEvent::PRESSED;
        aEvent.maEvent = e;
        aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

        maMouseListeners.notify( aGuard, aEvent );
        updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
    }
}

void SAL_CALL SlideShowView::mouseReleased( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    if( mbMousePressedEaten )
    {
        // if mouse button down was ignored, also ignore mouse button up
        mbMousePressedEaten = false;
    }
    else if( mpSlideShow && !mpSlideShow->isInputFreezed() )
    {
        // Change event source, to enable listeners to match event
        // with view
        WrappedMouseEvent aEvent;
        aEvent.meType = WrappedMouseEvent::RELEASED;
        aEvent.maEvent = e;
        aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

        maMouseListeners.notify( aGuard, aEvent );
        updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
    }
}

void SlideShowView::ignoreNextMouseReleased()
{
    std::unique_lock aGuard( m_aMutex );
    mbMousePressedEaten = true;
}

void SAL_CALL SlideShowView::mouseEntered( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    // Change event source, to enable listeners to match event
    // with view
    WrappedMouseEvent aEvent;
    aEvent.meType = WrappedMouseEvent::ENTERED;
    aEvent.maEvent = e;
    aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

    maMouseListeners.notify( aGuard, aEvent );
    updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
}

void SAL_CALL SlideShowView::mouseExited( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    // Change event source, to enable listeners to match event
    // with view
    WrappedMouseEvent aEvent;
    aEvent.meType = WrappedMouseEvent::EXITED;
    aEvent.maEvent = e;
    aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

    maMouseListeners.notify( aGuard, aEvent );
    updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
}

// XMouseMotionListener implementation
void SAL_CALL SlideShowView::mouseDragged( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    // Change event source, to enable listeners to match event
    // with view
    WrappedMouseMotionEvent aEvent;
    aEvent.meType = WrappedMouseMotionEvent::DRAGGED;
    aEvent.maEvent = e;
    aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

    maMouseMotionListeners.notify( aGuard, aEvent );
    updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
}

void SAL_CALL SlideShowView::mouseMoved( const awt::MouseEvent& e )
{
    std::unique_lock aGuard( m_aMutex );
    if (m_bDisposed)
        return;

    // Change event source, to enable listeners to match event
    // with view
    WrappedMouseMotionEvent aEvent;
    aEvent.meType = WrappedMouseMotionEvent::MOVED;
    aEvent.maEvent = e;
    aEvent.maEvent.Source = static_cast< ::cppu::OWeakObject* >( this );

    maMouseMotionListeners.notify( aGuard, aEvent );
    updateimpl( aGuard, mpSlideShow ); // warning: clears guard!
}

} // namespace ::sd

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