/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
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 * 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 <cmath>

#include <primitive2d/cropprimitive2d.hxx>
#include <drawinglayer/primitive2d/drawinglayer_primitivetypes2d.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <drawinglayer/primitive2d/maskprimitive2d.hxx>
#include <utility>


using namespace com::sun::star;


namespace drawinglayer::primitive2d
{
        CropPrimitive2D::CropPrimitive2D(
            Primitive2DContainer&& aChildren,
            basegfx::B2DHomMatrix aTransformation,
            double fCropLeft,
            double fCropTop,
            double fCropRight,
            double fCropBottom)
        :   GroupPrimitive2D(std::move(aChildren)),
            maTransformation(std::move(aTransformation)),
            mfCropLeft(fCropLeft),
            mfCropTop(fCropTop),
            mfCropRight(fCropRight),
            mfCropBottom(fCropBottom)
        {
        }

        bool CropPrimitive2D::operator==(const BasePrimitive2D& rPrimitive) const
        {
            if(GroupPrimitive2D::operator==(rPrimitive))
            {
                const CropPrimitive2D& rCompare = static_cast< const CropPrimitive2D& >(rPrimitive);

                return (getTransformation() == rCompare.getTransformation()
                    && getCropLeft() == rCompare.getCropLeft()
                    && getCropTop() == rCompare.getCropTop()
                    && getCropRight() == rCompare.getCropRight()
                    && getCropBottom() == rCompare.getCropBottom());
            }

            return false;
        }

        void CropPrimitive2D::get2DDecomposition(Primitive2DDecompositionVisitor& rVisitor, const geometry::ViewInformation2D& /*rViewInformation*/) const
        {
            if(getChildren().empty())
                return;

            // get original object scale in unit coordinates (no mirroring). The column
            // lengths are the transformation's per-axis scales whatever its rotation.
            const basegfx::B2DVector aObjectScale(
                std::hypot(getTransformation().get(0, 0), getTransformation().get(1, 0)),
                std::hypot(getTransformation().get(0, 1), getTransformation().get(1, 1)));

            // we handle cropping, so when no width or no height, content will be empty,
            // so only do something when we have a width and a height
            if(aObjectScale.equalZero())
                return;

            // calculate crop distances in unit coordinates. They are already combined with CropScaleFactor, thus
            // are relative only to object scale
            const double fBackScaleX(basegfx::fTools::equalZero(aObjectScale.getX()) ? 1.0 : 1.0 / fabs(aObjectScale.getX()));
            const double fBackScaleY(basegfx::fTools::equalZero(aObjectScale.getY()) ? 1.0 : 1.0 / fabs(aObjectScale.getY()));
            const double fLeft(getCropLeft() * fBackScaleX);
            const double fTop(getCropTop() * fBackScaleY);
            const double fRight(getCropRight() * fBackScaleX);
            const double fBottom(getCropBottom() * fBackScaleY);

            // calc new unit range for comparisons; the original range is the unit range
            const basegfx::B2DRange aUnitRange(0.0, 0.0, 1.0, 1.0);
            const basegfx::B2DRange aNewRange(
                -fLeft,
                -fTop,
                1.0 + fRight,
                1.0 + fBottom);

            // if we have no overlap the crop has removed everything, so we do only
            // have to create content if this is not the case
            if(!aNewRange.overlaps(aUnitRange))
                return;

            // create new transform; first take out old transform to get
            // to unit coordinates by inverting. Inverting should be flawless
            // since we already checked that object size is not zero in X or Y
            basegfx::B2DHomMatrix aNewTransform(getTransformation());

            aNewTransform.invert();

            // apply crop enlargement in unit coordinates
            aNewTransform = basegfx::utils::createScaleTranslateB2DHomMatrix(
                aNewRange.getRange(),
                aNewRange.getMinimum()) * aNewTransform;

            // apply original transformation. Since we have manipulated the crop
            // in unit coordinates we do not need to care about mirroring or
            // a corrected point for a possible shear or rotation, this all comes for
            // free
            aNewTransform = getTransformation() * aNewTransform;

            // prepare TransformPrimitive2D with xPrimitive
            const Primitive2DReference xTransformPrimitive(
                new TransformPrimitive2D(
                    aNewTransform,
                    Primitive2DContainer(getChildren())));

            if(aUnitRange.isInside(aNewRange))
            {
                // the new range is completely inside the old range (unit range),
                // so no masking is needed
                rVisitor.visit(xTransformPrimitive);
            }
            else
            {
                // mask with original object's bounds
                basegfx::B2DPolyPolygon aMaskPolyPolygon(basegfx::utils::createUnitPolygon());
                aMaskPolyPolygon.transform(getTransformation());

                // create maskPrimitive with aMaskPolyPolygon and aMaskContentVector
                const Primitive2DReference xMask(
                    new MaskPrimitive2D(
                        std::move(aMaskPolyPolygon),
                        Primitive2DContainer { xTransformPrimitive }));

                rVisitor.visit(xMask);
            }
        }

        // provide unique ID
        sal_uInt32 CropPrimitive2D::getPrimitive2DID() const
        {
            return PRIMITIVE2D_ID_CROPPRIMITIVE2D;
        }

} // end of namespace

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