/* -*- 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 <primitive2d/wallpaperprimitive2d.hxx>
#include <drawinglayer/primitive2d/bitmapprimitive2d.hxx>
#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
#include <drawinglayer/primitive2d/fillgraphicprimitive2d.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <drawinglayer/primitive2d/maskprimitive2d.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <vcl/graph.hxx>
#include <toolkit/helper/vclunohelper.hxx>


namespace drawinglayer::primitive2d
{
        Primitive2DReference WallpaperBitmapPrimitive2D::create2DDecomposition(const geometry::ViewInformation2D& /*rViewInformation*/) const
        {

            if(getLocalObjectRange().isEmpty() || getBitmapEx().IsEmpty())
                return nullptr;

            Primitive2DReference aRetval;

            // get bitmap PIXEL size
            const Size& rPixelSize = getBitmapEx().GetSizePixel();

            if(rPixelSize.Width() <= 0 || rPixelSize.Height() <= 0)
                return nullptr;

            if(WallpaperStyle::Scale == getWallpaperStyle())
            {
                // shortcut for scale; use simple BitmapPrimitive2D
                basegfx::B2DHomMatrix aObjectTransform;

                aObjectTransform.set(0, 0, getLocalObjectRange().getWidth());
                aObjectTransform.set(1, 1, getLocalObjectRange().getHeight());
                aObjectTransform.set(0, 2, getLocalObjectRange().getMinX());
                aObjectTransform.set(1, 2, getLocalObjectRange().getMinY());

                aRetval.set(
                    new BitmapPrimitive2D(
                        getBitmapEx(),
                        aObjectTransform));
            }
            else
            {
                // transform to logic size
                basegfx::B2DHomMatrix aInverseViewTransformation(getViewTransformation());
                aInverseViewTransformation.invert();
                basegfx::B2DVector aLogicSize(rPixelSize.Width(), rPixelSize.Height());
                aLogicSize = aInverseViewTransformation * aLogicSize;

                // apply layout
                basegfx::B2DPoint aTargetTopLeft(getLocalObjectRange().getMinimum());
                bool bUseTargetTopLeft(true);
                bool bNeedsClipping(false);

                switch(getWallpaperStyle())
                {
                    default: //case WallpaperStyle::Tile :, also WallpaperStyle::NONE and WallpaperStyle::ApplicationGradient
                    {
                        bUseTargetTopLeft = false;
                        break;
                    }
                    case WallpaperStyle::Scale :
                    {
                        // handled by shortcut above
                        break;
                    }
                    case WallpaperStyle::TopLeft :
                    {
                        // nothing to do
                        break;
                    }
                    case WallpaperStyle::Top :
                    {
                        const basegfx::B2DPoint aCenter(getLocalObjectRange().getCenter());
                        aTargetTopLeft.setX(aCenter.getX() - (aLogicSize.getX() * 0.5));
                        break;
                    }
                    case WallpaperStyle::TopRight :
                    {
                        aTargetTopLeft.setX(getLocalObjectRange().getMaxX() - aLogicSize.getX());
                        break;
                    }
                    case WallpaperStyle::Left :
                    {
                        const basegfx::B2DPoint aCenter(getLocalObjectRange().getCenter());
                        aTargetTopLeft.setY(aCenter.getY() - (aLogicSize.getY() * 0.5));
                        break;
                    }
                    case WallpaperStyle::Center :
                    {
                        const basegfx::B2DPoint aCenter(getLocalObjectRange().getCenter());
                        aTargetTopLeft = aCenter - (aLogicSize * 0.5);
                        break;
                    }
                    case WallpaperStyle::Right :
                    {
                        const basegfx::B2DPoint aCenter(getLocalObjectRange().getCenter());
                        aTargetTopLeft.setX(getLocalObjectRange().getMaxX() - aLogicSize.getX());
                        aTargetTopLeft.setY(aCenter.getY() - (aLogicSize.getY() * 0.5));
                        break;
                    }
                    case WallpaperStyle::BottomLeft :
                    {
                        aTargetTopLeft.setY(getLocalObjectRange().getMaxY() - aLogicSize.getY());
                        break;
                    }
                    case WallpaperStyle::Bottom :
                    {
                        const basegfx::B2DPoint aCenter(getLocalObjectRange().getCenter());
                        aTargetTopLeft.setX(aCenter.getX() - (aLogicSize.getX() * 0.5));
                        aTargetTopLeft.setY(getLocalObjectRange().getMaxY() - aLogicSize.getY());
                        break;
                    }
                    case WallpaperStyle::BottomRight :
                    {
                        aTargetTopLeft = getLocalObjectRange().getMaximum() - aLogicSize;
                        break;
                    }
                }

                if(bUseTargetTopLeft)
                {
                    // fill target range
                    const basegfx::B2DRange aTargetRange(aTargetTopLeft, aTargetTopLeft + aLogicSize);

                    // create aligned, single BitmapPrimitive2D
                    basegfx::B2DHomMatrix aObjectTransform;

                    aObjectTransform.set(0, 0, aTargetRange.getWidth());
                    aObjectTransform.set(1, 1, aTargetRange.getHeight());
                    aObjectTransform.set(0, 2, aTargetRange.getMinX());
                    aObjectTransform.set(1, 2, aTargetRange.getMinY());

                    aRetval.set(
                        new BitmapPrimitive2D(
                            getBitmapEx(),
                            aObjectTransform));

                    // clip when not completely inside object range
                    bNeedsClipping = !getLocalObjectRange().isInside(aTargetRange);
                }
                else
                {
                    // WallpaperStyle::Tile, WallpaperStyle::NONE, WallpaperStyle::ApplicationGradient
                    // convert to relative positions
                    const basegfx::B2DVector aRelativeSize(
                        aLogicSize.getX() / (getLocalObjectRange().getWidth() ? getLocalObjectRange().getWidth() : 1.0),
                        aLogicSize.getY() / (getLocalObjectRange().getHeight() ? getLocalObjectRange().getHeight() : 1.0));
                    basegfx::B2DPoint aRelativeTopLeft(0.0, 0.0);

                    if(WallpaperStyle::Tile != getWallpaperStyle())
                    {
                        aRelativeTopLeft.setX(0.5 - aRelativeSize.getX());
                        aRelativeTopLeft.setY(0.5 - aRelativeSize.getY());
                    }

                    // prepare FillGraphicAttribute
                    const attribute::FillGraphicAttribute aFillGraphicAttribute(
                        Graphic(getBitmapEx()),
                        basegfx::B2DRange(aRelativeTopLeft, aRelativeTopLeft+ aRelativeSize),
                        true);

                    // create ObjectTransform
                    const basegfx::B2DHomMatrix aObjectTransform(
                        basegfx::utils::createScaleTranslateB2DHomMatrix(
                            getLocalObjectRange().getRange(),
                            getLocalObjectRange().getMinimum()));

                    // create FillBitmapPrimitive
                    aRetval.set(
                        new drawinglayer::primitive2d::FillGraphicPrimitive2D(
                            aObjectTransform,
                            aFillGraphicAttribute));

                    // always embed tiled fill to clipping
                    bNeedsClipping = true;
                }

                if(bNeedsClipping)
                {
                    // embed to clipping; this is necessary for tiled fills
                    basegfx::B2DPolyPolygon aPolyPolygon(
                        basegfx::utils::createPolygonFromRect(getLocalObjectRange()));
                    const drawinglayer::primitive2d::Primitive2DReference xClippedFill(
                        new drawinglayer::primitive2d::MaskPrimitive2D(
                            std::move(aPolyPolygon),
                            { aRetval }));
                    aRetval = xClippedFill;
                }
            }

            return aRetval;
        }

        WallpaperBitmapPrimitive2D::WallpaperBitmapPrimitive2D(
            const basegfx::B2DRange& rObjectRange,
            const BitmapEx& rBitmapEx,
            WallpaperStyle eWallpaperStyle)
        :   maObjectRange(rObjectRange),
            maBitmapEx(rBitmapEx),
            meWallpaperStyle(eWallpaperStyle)
        {
        }

        bool WallpaperBitmapPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
        {
            if(ViewTransformationDependentPrimitive2D::operator==(rPrimitive))
            {
                const WallpaperBitmapPrimitive2D& rCompare = static_cast<const WallpaperBitmapPrimitive2D&>(rPrimitive);

                return (getLocalObjectRange() == rCompare.getLocalObjectRange()
                    && getBitmapEx() == rCompare.getBitmapEx()
                    && getWallpaperStyle() == rCompare.getWallpaperStyle());
            }

            return false;
        }

        basegfx::B2DRange WallpaperBitmapPrimitive2D::getB2DRange(const geometry::ViewInformation2D& /*rViewInformation*/) const
        {
            return getLocalObjectRange();
        }

        // provide unique ID
        sal_uInt32 WallpaperBitmapPrimitive2D::getPrimitive2DID() const
        {
            return PRIMITIVE2D_ID_WALLPAPERBITMAPPRIMITIVE2D;
        }

} // end of namespace

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */