/*

 * Copyright 2023 Google LLC

 *

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

 * found in the LICENSE file.

 */

#include "fuzz/Fuzz.h"

#include "include/core/SkCanvas.h"

#include "include/core/SkColorFilter.h"

#include "include/core/SkColorSpace.h"

#include "include/core/SkFont.h"

#include "include/core/SkImageInfo.h"

#include "include/core/SkPaint.h"

#include "include/core/SkPathBuilder.h"

#include "include/core/SkRefCnt.h"

#include "include/effects/SkColorMatrix.h"

#include "include/gpu/graphite/Context.h"

#include "include/gpu/graphite/Surface.h"

#include "include/gpu/graphite/precompile/Precompile.h"

#include "include/gpu/graphite/precompile/PrecompileColorFilter.h"

#include "modules/skcms/skcms.h"

#include "src/core/SkBlenderBase.h"

#include "src/gpu/graphite/ContextPriv.h"

#include "src/gpu/graphite/ContextUtils.h"

#include "src/gpu/graphite/KeyContext.h"

#include "src/gpu/graphite/PaintParams.h"

#include "src/gpu/graphite/PaintParamsKey.h"

#include "src/gpu/graphite/PipelineData.h"

#include "src/gpu/graphite/RecorderPriv.h"

#include "src/gpu/graphite/Renderer.h"

#include "src/gpu/graphite/RuntimeEffectDictionary.h"

#include "src/gpu/graphite/geom/Geometry.h"

#include "src/gpu/graphite/precompile/PaintOptionsPriv.h"

#include "tools/gpu/GrContextFactory.h"

#include "tools/graphite/ContextFactory.h"

using namespace skgpu::graphite;

namespace {

SkBlendMode random_blend_mode(Fuzz* fuzz) {

    uint32_t temp;

    fuzz->next(&temp);

    return (SkBlendMode) (temp % kSkBlendModeCount);

}

SkColor random_opaque_skcolor(Fuzz* fuzz) {

    SkColor color;

    fuzz->next(&color);

    return 0xff000000 | color;

}

SkColor4f random_color4f(Fuzz* fuzz) {

    bool makeOpaque;

    fuzz->next(&makeOpaque);

    SkColor4f color;

    fuzz->nextRange(&color.fR, 0, 1);

    fuzz->nextRange(&color.fG, 0, 1);

    fuzz->nextRange(&color.fB, 0, 1);

    if (makeOpaque) {

        color.fA = 1.0;

    } else {

        fuzz->nextRange(&color.fA, 0, 1);

    }

    return color;

}

SkPath make_path() {

    SkPathBuilder path;

    path.moveTo(0, 0);

    path.lineTo(8, 2);

    path.lineTo(16, 0);

    path.lineTo(14, 8);

    path.lineTo(16, 16);

    path.lineTo(8, 14);

    path.lineTo(0, 16);

    path.lineTo(2, 8);

    path.close();

    return path.detach();

}

//--------------------------------------------------------------------------------------------------

// color spaces

const skcms_TransferFunction& random_transfer_function(Fuzz* fuzz) {

    static constexpr skcms_TransferFunction gTransferFunctions[] = {

            SkNamedTransferFn::kSRGB,

            SkNamedTransferFn::k2Dot2,

            SkNamedTransferFn::kLinear,

            SkNamedTransferFn::kRec2020,

            SkNamedTransferFn::kPQ,

            SkNamedTransferFn::kHLG,

    };

    uint32_t xferFunction;

    fuzz->next(&xferFunction);

    xferFunction %= std::size(gTransferFunctions);

    return gTransferFunctions[xferFunction];

}

const skcms_Matrix3x3& random_gamut(Fuzz* fuzz) {

    static constexpr skcms_Matrix3x3 gGamuts[] = {

            SkNamedGamut::kSRGB,

            SkNamedGamut::kAdobeRGB,

            SkNamedGamut::kDisplayP3,

            SkNamedGamut::kRec2020,

            SkNamedGamut::kXYZ,

    };

    uint32_t gamut;

    fuzz->next(&gamut);

    gamut %= std::size(gGamuts);

    return gGamuts[gamut];

}

enum class ColorSpaceType {

    kNone,

    kSRGB,

    kSRGBLinear,

    kRGB,

    kLast = kRGB

};

static constexpr int kColorSpaceTypeCount = static_cast<int>(ColorSpaceType::kLast) + 1;

sk_sp<SkColorSpace> create_colorspace(Fuzz* fuzz, ColorSpaceType csType) {

    switch (csType) {

        case ColorSpaceType::kNone:

            return nullptr;

        case ColorSpaceType::kSRGB:

            return SkColorSpace::MakeSRGB();

        case ColorSpaceType::kSRGBLinear:

            return SkColorSpace::MakeSRGBLinear();

        case ColorSpaceType::kRGB:

            return SkColorSpace::MakeRGB(random_transfer_function(fuzz), random_gamut(fuzz));

    }

    SkUNREACHABLE;

}

sk_sp<SkColorSpace> create_random_colorspace(Fuzz* fuzz) {

    uint32_t temp;

    fuzz->next(&temp);

    ColorSpaceType csType = (ColorSpaceType) (temp % kColorSpaceTypeCount);

    return create_colorspace(fuzz, csType);

}

//--------------------------------------------------------------------------------------------------

// color filters

enum class ColorFilterType {

    kNone,

    kBlend,

    kMatrix,

    kHSLAMatrix,

    // TODO: add more color filters

    kLast = kHSLAMatrix

};

static constexpr int kColorFilterTypeCount = static_cast<int>(ColorFilterType::kLast) + 1;

std::pair<sk_sp<SkColorFilter>, sk_sp<PrecompileColorFilter>> create_blend_colorfilter(

        Fuzz* fuzz) {

    sk_sp<SkColorFilter> cf;

    // SkColorFilters::Blend is clever and can weed out noop color filters. Loop until we get

    // a valid color filter.

    while (!cf && !fuzz->exhausted()) {

        cf = SkColorFilters::Blend(random_color4f(fuzz),

                                   create_random_colorspace(fuzz),

                                   random_blend_mode(fuzz));

    }

    sk_sp<PrecompileColorFilter> o = cf ? PrecompileColorFilters::Blend() : nullptr;

    return { cf, o };

}

std::pair<sk_sp<SkColorFilter>, sk_sp<PrecompileColorFilter>> create_matrix_colorfilter() {

    sk_sp<SkColorFilter> cf = SkColorFilters::Matrix(

            SkColorMatrix::RGBtoYUV(SkYUVColorSpace::kJPEG_Full_SkYUVColorSpace));

    sk_sp<PrecompileColorFilter> o = PrecompileColorFilters::Matrix();

    return { cf, o };

}

std::pair<sk_sp<SkColorFilter>, sk_sp<PrecompileColorFilter>> create_hsla_matrix_colorfilter() {

    sk_sp<SkColorFilter> cf = SkColorFilters::HSLAMatrix(

            SkColorMatrix::RGBtoYUV(SkYUVColorSpace::kJPEG_Full_SkYUVColorSpace));

    sk_sp<PrecompileColorFilter> o = PrecompileColorFilters::HSLAMatrix();

    return { cf, o };

}

std::pair<sk_sp<SkColorFilter>, sk_sp<PrecompileColorFilter>> create_colorfilter(

        Fuzz* fuzz,

        ColorFilterType type,

        int depth) {

    if (depth <= 0) {

        return {};

    }

    switch (type) {

        case ColorFilterType::kNone:

            return { nullptr, nullptr };

        case ColorFilterType::kBlend:

            return create_blend_colorfilter(fuzz);

        case ColorFilterType::kMatrix:

            return create_matrix_colorfilter();

        case ColorFilterType::kHSLAMatrix:

            return create_hsla_matrix_colorfilter();

    }

    SkUNREACHABLE;

}

std::pair<sk_sp<SkColorFilter>, sk_sp<PrecompileColorFilter>> create_random_colorfilter(

        Fuzz* fuzz,

        int depth) {

    uint32_t temp;

    fuzz->next(&temp);

    ColorFilterType cf = (ColorFilterType) (temp % kColorFilterTypeCount);

    return create_colorfilter(fuzz, cf, depth);

}

//--------------------------------------------------------------------------------------------------

std::pair<SkPaint, PaintOptions> create_random_paint(Fuzz* fuzz, int depth) {

    if (depth <= 0) {

        return {};

    }

    SkPaint paint;

    paint.setColor(random_opaque_skcolor(fuzz));

    PaintOptions paintOptions;

    {

        auto [cf, o] = create_random_colorfilter(fuzz, depth - 1);

        SkASSERT_RELEASE(!cf == !o);

        if (cf) {

            paint.setColorFilter(std::move(cf));

            paintOptions.setColorFilters({o});

        }

    }

    return { paint, paintOptions };

}

//--------------------------------------------------------------------------------------------------

void check_draw(Context* context,

                Recorder* recorder,

                const SkPaint& paint,

                DrawTypeFlags dt,

                const SkPath& path) {

    int before = context->priv().globalCache()->numGraphicsPipelines();

    {

        // TODO: vary the colorType of the target surface too

        SkImageInfo ii = SkImageInfo::Make(16, 16,

                                           kRGBA_8888_SkColorType,

                                           kPremul_SkAlphaType);

        sk_sp<SkSurface> surf = SkSurfaces::RenderTarget(recorder, ii);

        SkCanvas* canvas = surf->getCanvas();

        switch (dt) {

            case DrawTypeFlags::kSimpleShape:

                canvas->drawRect(SkRect::MakeWH(16, 16), paint);

                break;

            case DrawTypeFlags::kNonSimpleShape:

                canvas->drawPath(path, paint);

                break;

            default:

                SkASSERT_RELEASE(false);

                break;

        }

        std::unique_ptr<skgpu::graphite::Recording> recording = recorder->snap();

        context->insertRecording({ recording.get() });

        context->submit(SyncToCpu::kYes);

    }

    int after = context->priv().globalCache()->numGraphicsPipelines();

    // Actually using the SkPaint with the specified type of draw shouldn't have caused

    // any additional compilation

    SkASSERT_RELEASE(before == after);

}

void fuzz_graphite(Fuzz* fuzz, Context* context, int depth = 9) {

    auto recorder = context->makeRecorder();

    ShaderCodeDictionary* dict = context->priv().shaderCodeDictionary();

    SkColorInfo ci = SkColorInfo(kRGBA_8888_SkColorType, kPremul_SkAlphaType,

                                 SkColorSpace::MakeSRGB());

    std::unique_ptr<RuntimeEffectDictionary> rtDict = std::make_unique<RuntimeEffectDictionary>();

    KeyContext precompileKeyContext(recorder->priv().caps(),

                                    dict,

                                    rtDict.get(),

                                    ci,

                                    /* dstTexture= */ nullptr,

                                    /* dstOffset= */ {0, 0});

    auto dstTexInfo = recorder->priv().caps()->getDefaultSampledTextureInfo(kRGBA_8888_SkColorType,

                                                                            skgpu::Mipmapped::kNo,

                                                                            skgpu::Protected::kNo,

                                                                            skgpu::Renderable::kNo);

    // Use Budgeted::kYes to avoid immediately instantiating the TextureProxy. This test doesn't

    // require full resources.

    sk_sp<TextureProxy> fakeDstTexture = TextureProxy::Make(recorder->priv().caps(),

                                                            recorder->priv().resourceProvider(),

                                                            SkISize::Make(1, 1),

                                                            dstTexInfo,

                                                            "FuzzPrecompileFakeDstTexture",

                                                            skgpu::Budgeted::kYes);

    constexpr SkIPoint fakeDstOffset = SkIPoint::Make(0, 0);

    DrawTypeFlags kDrawType = DrawTypeFlags::kSimpleShape;

    SkPath path = make_path();

    Layout layout = context->backend() == skgpu::BackendApi::kMetal ? Layout::kMetal

                                                                    : Layout::kStd140;

    PaintParamsKeyBuilder builder(dict);

    PipelineDataGatherer gatherer(layout);

    auto [paint, paintOptions] = create_random_paint(fuzz, depth);

    constexpr Coverage coverageOptions[3] = {

            Coverage::kNone, Coverage::kSingleChannel, Coverage::kLCD};

    uint32_t temp;

    fuzz->next(&temp);

    Coverage coverage = coverageOptions[temp % 3];

    DstReadRequirement dstReadReq = DstReadRequirement::kNone;

    const SkBlenderBase* blender = as_BB(paint.getBlender());

    if (blender) {

        dstReadReq = GetDstReadRequirement(recorder->priv().caps(),

                                           blender->asBlendMode(),

                                           coverage);

    }

    bool needsDstSample = dstReadReq == DstReadRequirement::kTextureCopy ||

                          dstReadReq == DstReadRequirement::kTextureSample;

    sk_sp<TextureProxy> curDst = needsDstSample ? fakeDstTexture : nullptr;

    auto [paintID, uData, tData] = ExtractPaintData(recorder.get(),

                                                    &gatherer,

                                                    &builder,

                                                    layout,

                                                    {},

                                                    PaintParams(paint,

                                                                /* primitiveBlender= */ nullptr,

                                                                /* analyticClip= */ {},

                                                                /* clipShader= */ nullptr,

                                                                dstReadReq,

                                                                /* skipColorXform= */ false),

                                                    {},

                                                    curDst,

                                                    fakeDstOffset,

                                                    ci);

    std::vector<UniquePaintParamsID> precompileIDs;

    paintOptions.priv().buildCombinations(precompileKeyContext,

                                          &gatherer,

                                          DrawTypeFlags::kNone,

                                          /* withPrimitiveBlender= */ false,

                                          coverage,

                                          [&](UniquePaintParamsID id,

                                              DrawTypeFlags,

                                              bool /* withPrimitiveBlender */,

                                              Coverage) {

                                                  precompileIDs.push_back(id);

                                          });

    // The specific key generated by ExtractPaintData should be one of the

    // combinations generated by the combination system.

    auto result = std::find(precompileIDs.begin(), precompileIDs.end(), paintID);

#ifdef SK_DEBUG

    if (result == precompileIDs.end()) {

        SkDebugf("From paint: ");

        dict->dump(paintID);

        SkDebugf("From combination builder:");

        for (auto iter : precompileIDs) {

            dict->dump(iter);

        }

    }

#endif

    SkASSERT_RELEASE(result != precompileIDs.end());

    {

        static const RenderPassProperties kDefaultRenderPassProperties;

        context->priv().globalCache()->resetGraphicsPipelines();

        int before = context->priv().globalCache()->numGraphicsPipelines();

        Precompile(context, paintOptions, kDrawType, { kDefaultRenderPassProperties });

        int after = context->priv().globalCache()->numGraphicsPipelines();

        SkASSERT_RELEASE(before == 0);

        SkASSERT_RELEASE(after > before);

        check_draw(context, recorder.get(), paint, kDrawType, path);

    }

}

} // anonymous namespace

DEF_FUZZ(Precompile, fuzz) {

    skiatest::graphite::ContextFactory factory;

    skgpu::ContextType contextType;

#if defined(SK_METAL)

    contextType = skgpu::ContextType::kMetal;

#elif defined(SK_VULKAN)

    contextType = skgpu::ContextType::kVulkan;

#else

    contextType = skgpu::ContextType::kMock;

#endif

    skiatest::graphite::ContextInfo ctxInfo = factory.getContextInfo(contextType);

    skgpu::graphite::Context* context = ctxInfo.fContext;

    if (!context) {

        return;

    }

    fuzz_graphite(fuzz, context);

}