/*

 * Copyright 2021 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#include "include/core/SkImageFilter.h"

#include "include/core/SkMatrix.h"

#include "include/core/SkRefCnt.h"

#include "include/core/SkSamplingOptions.h"

#include "include/effects/SkImageFilters.h"

#include "modules/skottie/src/Adapter.h"

#include "modules/skottie/src/SkottiePriv.h"

#include "modules/skottie/src/SkottieValue.h"

#include "modules/skottie/src/effects/Effects.h"

#include "modules/sksg/include/SkSGRenderEffect.h"

#include "modules/sksg/include/SkSGRenderNode.h"

#include <cstddef>

#include <utility>

namespace skjson {

class ArrayValue;

}

namespace skottie::internal {

namespace {

class DirectionalBlurAdapter final : public DiscardableAdapterBase<DirectionalBlurAdapter,

                                                                   sksg::ExternalImageFilter> {

    public:

        DirectionalBlurAdapter(const skjson::ArrayValue& jprops,

                               const AnimationBuilder& abuilder)

            : INHERITED(sksg::ExternalImageFilter::Make())

        {

            enum : size_t {

                kDirection_Index  = 0,

                kBlurLength_Index = 1,

            };

            EffectBinder(jprops, abuilder, this)

                .bind(       kDirection_Index, fDirection)

                .bind(    kBlurLength_Index, fBlurLength);

        }

    private:

        void onSync() override {

            const auto rot = fDirection - 90;

            auto filter =

            SkImageFilters::MatrixTransform(SkMatrix::RotateDeg(rot),

            SkSamplingOptions(SkFilterMode::kLinear),

                SkImageFilters::Blur(fBlurLength * kBlurSizeToSigma, 0,

                    SkImageFilters::MatrixTransform(SkMatrix::RotateDeg(-rot),

                    SkSamplingOptions(SkFilterMode::kLinear), nullptr)));

            this->node()->setImageFilter(std::move(filter));

        }

        ScalarValue fDirection = 0;

        ScalarValue fBlurLength = 0;

        using INHERITED = DiscardableAdapterBase<DirectionalBlurAdapter, sksg::ExternalImageFilter>;

};

} // namespace

sk_sp<sksg::RenderNode> EffectBuilder::attachDirectionalBlurEffect(const skjson::ArrayValue& jprops,

                                                             sk_sp<sksg::RenderNode> layer) const {

    auto imageFilterNode = fBuilder->attachDiscardableAdapter<DirectionalBlurAdapter>(jprops,

                                                                      *fBuilder);

    return sksg::ImageFilterEffect::Make(std::move(layer), std::move(imageFilterNode));

}

} // namespace skottie::internal