/* -*- 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 <drawinglayer/primitive2d/pagepreviewprimitive2d.hxx>

#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>

#include <drawinglayer/primitive2d/maskprimitive2d.hxx>

#include <basegfx/polygon/b2dpolygontools.hxx>

#include <basegfx/polygon/b2dpolygon.hxx>

#include <drawinglayer/primitive2d/transformprimitive2d.hxx>

#include <basegfx/matrix/b2dhommatrixtools.hxx>

#include <utility>

using namespace com::sun::star;

namespace drawinglayer::primitive2d

{

        Primitive2DReference PagePreviewPrimitive2D::create2DDecomposition(const geometry::ViewInformation2D& rViewInformation) const

        {

            Primitive2DContainer aContent(getPageContent());

            if(!(!aContent.empty()

                && getContentWidth() > 0.0)

                && getContentHeight() > 0.0)

                return nullptr;

            // the decomposed matrix will be needed

            basegfx::B2DVector aScale, aTranslate;

            double fRotate, fShearX;

            getTransform().decompose(aScale, aTranslate, fRotate, fShearX);

            if(!(aScale.getX() > 0.0 && aScale.getY() > 0.0))

                return nullptr;

            // check if content overlaps with target size and needs to be embedded with a

            // clipping primitive

            const basegfx::B2DRange aRealContentRange(aContent.getB2DRange(rViewInformation));

            const basegfx::B2DRange aAllowedContentRange(0.0, 0.0, getContentWidth(), getContentHeight());

            if(!aAllowedContentRange.isInside(aRealContentRange))

            {

                const Primitive2DReference xReferenceA(

                    new MaskPrimitive2D(

                        basegfx::B2DPolyPolygon(

                            basegfx::utils::createPolygonFromRect(aAllowedContentRange)), std::move(aContent)));

                aContent = Primitive2DContainer { xReferenceA };

            }

            // create a mapping from content to object.

            basegfx::B2DHomMatrix aPageTrans;

            // #i101075# when keeping the aspect ratio is wanted, it is necessary to calculate

            // an equidistant scaling in X and Y and a corresponding translation to

            // center the output. Calculate needed scale factors

            const double fScaleX(aScale.getX() / getContentWidth());

            const double fScaleY(aScale.getY() / getContentHeight());

            // to keep the aspect, use the smaller scale and adapt missing size by translation

            if(fScaleX < fScaleY)

            {

                // height needs to be adapted

                const double fNeededHeight(aScale.getY() / fScaleX);

                const double fSpaceToAdd(fNeededHeight - getContentHeight());

                aPageTrans.translate(0.0, fSpaceToAdd * 0.5);

                aPageTrans.scale(fScaleX, aScale.getY() / fNeededHeight);

            }

            else

            {

                // width needs to be adapted

                const double fNeededWidth(aScale.getX() / fScaleY);

                const double fSpaceToAdd(fNeededWidth - getContentWidth());

                aPageTrans.translate(fSpaceToAdd * 0.5, 0.0);

                aPageTrans.scale(aScale.getX() / fNeededWidth, fScaleY);

            }

            // add the missing object transformation aspects

            const basegfx::B2DHomMatrix aCombined(basegfx::utils::createShearXRotateTranslateB2DHomMatrix(

                    fShearX, fRotate, aTranslate.getX(), aTranslate.getY()));

            aPageTrans = aCombined * aPageTrans;

            // embed in necessary transformation to map from SdrPage to SdrPageObject

            return new TransformPrimitive2D(aPageTrans, std::move(aContent));

        }

        PagePreviewPrimitive2D::PagePreviewPrimitive2D(

            css::uno::Reference< css::drawing::XDrawPage > xDrawPage,

            basegfx::B2DHomMatrix aTransform,

            double fContentWidth,

            double fContentHeight,

            Primitive2DContainer&& rPageContent)

        :   mxDrawPage(std::move(xDrawPage)),

            maPageContent(std::move(rPageContent)),

            maTransform(std::move(aTransform)),

            mfContentWidth(fContentWidth),

            mfContentHeight(fContentHeight)

        {

        }

        bool PagePreviewPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const

        {

            if(BasePrimitive2D::operator==(rPrimitive))

            {

                const PagePreviewPrimitive2D& rCompare = static_cast< const PagePreviewPrimitive2D& >(rPrimitive);

                return (getXDrawPage() == rCompare.getXDrawPage()

                    && getPageContent() == rCompare.getPageContent()

                    && getTransform() == rCompare.getTransform()

                    && getContentWidth() == rCompare.getContentWidth()

                    && getContentHeight() == rCompare.getContentHeight());

            }

            return false;

        }

        basegfx::B2DRange PagePreviewPrimitive2D::getB2DRange(const geometry::ViewInformation2D& /*rViewInformation`*/) const

        {

            // nothing is allowed to stick out of a PagePreviewPrimitive, thus we

            // can quickly deliver our range here

            basegfx::B2DRange aRetval(0.0, 0.0, 1.0, 1.0);

            aRetval.transform(getTransform());

            return aRetval;

        }

        // provide unique ID

        sal_uInt32 PagePreviewPrimitive2D::getPrimitive2DID() const

        {

            return PRIMITIVE2D_ID_PAGEPREVIEWPRIMITIVE2D;

        }

} // end of namespace

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