/*
 * Copyright 2016 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/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkData.h"
#include "include/core/SkDrawable.h"
#include "include/core/SkFlattenable.h"
#include "include/core/SkFont.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypes.h"
#include "src/core/SkPathEffectBase.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
#include "src/effects/colorfilters/SkColorFilterBase.h"
#include "src/shaders/SkShaderBase.h"
#include "tests/Test.h"
#include "tools/fonts/FontToolUtils.h"

#include <cstdint>
#include <cstring>

class IntDrawable : public SkDrawable {
public:
    IntDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d)
        : fA(a)
        , fB(b)
        , fC(c)
        , fD(d)
    {}

    void flatten(SkWriteBuffer& buffer) const override {
        buffer.writeUInt(fA);
        buffer.writeUInt(fB);
        buffer.writeUInt(fC);
        buffer.writeUInt(fD);
    }

    static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer) {
        uint32_t a = buffer.readUInt();
        uint32_t b = buffer.readUInt();
        uint32_t c = buffer.readUInt();
        uint32_t d = buffer.readUInt();
        return sk_sp<IntDrawable>(new IntDrawable(a, b, c, d));
    }

    Factory getFactory() const override { return CreateProc; }

    uint32_t a() const { return fA; }
    uint32_t b() const { return fB; }
    uint32_t c() const { return fC; }
    uint32_t d() const { return fD; }

    const char* getTypeName() const override { return "IntDrawable"; }

protected:
    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
    void onDraw(SkCanvas*) override {}

private:
    uint32_t fA;
    uint32_t fB;
    uint32_t fC;
    uint32_t fD;
};

class PaintDrawable : public SkDrawable {
public:
    PaintDrawable(const SkPaint& paint)
        : fPaint(paint)
    {}

    void flatten(SkWriteBuffer& buffer) const override {
        buffer.writePaint(fPaint);
    }

    static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer) {
        return sk_sp<PaintDrawable>(new PaintDrawable(buffer.readPaint()));
    }

    Factory getFactory() const override { return CreateProc; }

    const SkPaint& paint() const { return fPaint; }

    const char* getTypeName() const override { return "PaintDrawable"; }

protected:
    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
    void onDraw(SkCanvas*) override {}

private:
    SkPaint fPaint;
};

class CompoundDrawable : public SkDrawable {
public:
    CompoundDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d, const SkPaint& paint)
        : fIntDrawable(new IntDrawable(a, b, c, d))
        , fPaintDrawable(new PaintDrawable(paint))
    {}

    CompoundDrawable(IntDrawable* intDrawable, PaintDrawable* paintDrawable)
        : fIntDrawable(SkRef(intDrawable))
        , fPaintDrawable(SkRef(paintDrawable))
    {}

    void flatten(SkWriteBuffer& buffer) const override {
        buffer.writeFlattenable(fIntDrawable.get());
        buffer.writeFlattenable(fPaintDrawable.get());
    }

    static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer) {
        sk_sp<SkFlattenable> intDrawable(
                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
        SkASSERT(intDrawable);
        SkASSERT(!strcmp("IntDrawable", intDrawable->getTypeName()));

        sk_sp<SkFlattenable> paintDrawable(
                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
        SkASSERT(paintDrawable);
        SkASSERT(!strcmp("PaintDrawable", paintDrawable->getTypeName()));

        return sk_sp<CompoundDrawable>(new CompoundDrawable((IntDrawable*) intDrawable.get(),
                                                            (PaintDrawable*) paintDrawable.get()));
    }

    Factory getFactory() const override { return CreateProc; }

    IntDrawable* intDrawable() const { return fIntDrawable.get(); }
    PaintDrawable* paintDrawable() const { return fPaintDrawable.get(); }

    const char* getTypeName() const override { return "CompoundDrawable"; }

protected:
    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
    void onDraw(SkCanvas*) override {}

private:
    sk_sp<IntDrawable>   fIntDrawable;
    sk_sp<PaintDrawable> fPaintDrawable;
};

class RootDrawable : public SkDrawable {
public:
    RootDrawable(uint32_t a, uint32_t b, uint32_t c, uint32_t d, const SkPaint& paint,
                   uint32_t e, uint32_t f, uint32_t g, uint32_t h, SkDrawable* drawable)
        : fCompoundDrawable(new CompoundDrawable(a, b, c, d, paint))
        , fIntDrawable(new IntDrawable(e, f, g, h))
        , fDrawable(SkRef(drawable))
    {}

    RootDrawable(CompoundDrawable* compoundDrawable, IntDrawable* intDrawable,
            SkDrawable* drawable)
        : fCompoundDrawable(SkRef(compoundDrawable))
        , fIntDrawable(SkRef(intDrawable))
        , fDrawable(SkRef(drawable))
    {}

    void flatten(SkWriteBuffer& buffer) const override {
        buffer.writeFlattenable(fCompoundDrawable.get());
        buffer.writeFlattenable(fIntDrawable.get());
        buffer.writeFlattenable(fDrawable.get());
    }

    static sk_sp<SkFlattenable> CreateProc(SkReadBuffer& buffer) {
        sk_sp<SkFlattenable> compoundDrawable(
                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
        SkASSERT(compoundDrawable);
        SkASSERT(!strcmp("CompoundDrawable", compoundDrawable->getTypeName()));

        sk_sp<SkFlattenable> intDrawable(
                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
        SkASSERT(intDrawable);
        SkASSERT(!strcmp("IntDrawable", intDrawable->getTypeName()));

        sk_sp<SkFlattenable> drawable(
                buffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
        SkASSERT(drawable);

        return sk_sp<RootDrawable>(new RootDrawable((CompoundDrawable*) compoundDrawable.get(),
                                                    (IntDrawable*) intDrawable.get(),
                                                    (SkDrawable*) drawable.get()));
    }

    Factory getFactory() const override { return CreateProc; }

    CompoundDrawable* compoundDrawable() const { return fCompoundDrawable.get(); }
    IntDrawable* intDrawable() const { return fIntDrawable.get(); }
    SkDrawable* drawable() const { return fDrawable.get(); }

    const char* getTypeName() const override { return "RootDrawable"; }

protected:
    SkRect onGetBounds() override { return SkRect::MakeEmpty(); }
    void onDraw(SkCanvas*) override {}

private:
    sk_sp<CompoundDrawable> fCompoundDrawable;
    sk_sp<IntDrawable>      fIntDrawable;
    sk_sp<SkDrawable>       fDrawable;
};

// Register these drawables for deserialization some time before main().
static struct Initializer {
    Initializer() {
        SK_REGISTER_FLATTENABLE(IntDrawable);
        SK_REGISTER_FLATTENABLE(PaintDrawable);
        SK_REGISTER_FLATTENABLE(CompoundDrawable);
        SK_REGISTER_FLATTENABLE(RootDrawable);
    }
} initializer;

DEF_TEST(FlattenDrawable, r) {
    // Create and serialize the test drawable
    sk_sp<SkDrawable> drawable(new IntDrawable(1, 2, 3, 4));
    SkPaint paint;
    paint.setColor(SK_ColorBLUE);
    sk_sp<RootDrawable> root(new RootDrawable(5, 6, 7, 8, paint, 9, 10, 11, 12, drawable.get()));
    SkBinaryWriteBuffer writeBuffer({});
    writeBuffer.writeFlattenable(root.get());

    // Copy the contents of the write buffer into a read buffer
    sk_sp<SkData> data = SkData::MakeUninitialized(writeBuffer.bytesWritten());
    writeBuffer.writeToMemory(data->writable_data());
    SkReadBuffer readBuffer(data->data(), data->size());

    // Deserialize and verify the drawable
    sk_sp<SkDrawable> out((SkDrawable*)readBuffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
    REPORTER_ASSERT(r, out);
    REPORTER_ASSERT(r, !strcmp("RootDrawable", out->getTypeName()));

    RootDrawable* rootOut = (RootDrawable*) out.get();
    REPORTER_ASSERT(r, 5 == rootOut->compoundDrawable()->intDrawable()->a());
    REPORTER_ASSERT(r, 6 == rootOut->compoundDrawable()->intDrawable()->b());
    REPORTER_ASSERT(r, 7 == rootOut->compoundDrawable()->intDrawable()->c());
    REPORTER_ASSERT(r, 8 == rootOut->compoundDrawable()->intDrawable()->d());
    REPORTER_ASSERT(r, SK_ColorBLUE ==
            rootOut->compoundDrawable()->paintDrawable()->paint().getColor());
    REPORTER_ASSERT(r, 9 == rootOut->intDrawable()->a());
    REPORTER_ASSERT(r, 10 == rootOut->intDrawable()->b());
    REPORTER_ASSERT(r, 11 == rootOut->intDrawable()->c());
    REPORTER_ASSERT(r, 12 == rootOut->intDrawable()->d());

    // Note that we can still recognize the generic drawable as an IntDrawable
    SkDrawable* generic = rootOut->drawable();
    REPORTER_ASSERT(r, !strcmp("IntDrawable", generic->getTypeName()));
    IntDrawable* integer = (IntDrawable*) generic;
    REPORTER_ASSERT(r, 1 == integer->a());
    REPORTER_ASSERT(r, 2 == integer->b());
    REPORTER_ASSERT(r, 3 == integer->c());
    REPORTER_ASSERT(r, 4 == integer->d());
}

DEF_TEST(FlattenRecordedDrawable, r) {
    // Record a set of canvas draw commands
    SkPictureRecorder recorder;
    SkCanvas* canvas = recorder.beginRecording(1000.0f, 1000.0f);
    SkPaint paint;
    paint.setColor(SK_ColorGREEN);
    canvas->drawPoint(42.0f, 17.0f, paint);
    paint.setColor(SK_ColorRED);
    canvas->drawPaint(paint);
    SkPaint textPaint;
    textPaint.setColor(SK_ColorBLUE);
    canvas->drawString("TEXT", 467.0f, 100.0f, ToolUtils::DefaultFont(), textPaint);

    // Draw some drawables as well
    sk_sp<SkDrawable> drawable(new IntDrawable(1, 2, 3, 4));
    sk_sp<RootDrawable> root(new RootDrawable(5, 6, 7, 8, paint, 9, 10, 11, 12, drawable.get()));
    canvas->drawDrawable(root.get(), 747.0f, 242.0f);
    sk_sp<PaintDrawable> paintDrawable(new PaintDrawable(paint));
    canvas->drawDrawable(paintDrawable.get(), 500.0, 500.0f);
    sk_sp<CompoundDrawable> comDrawable(new CompoundDrawable(13, 14, 15, 16, textPaint));
    canvas->drawDrawable(comDrawable.get(), 10.0f, 10.0f);

    // Serialize the recorded drawable
    sk_sp<SkDrawable> recordedDrawable = recorder.finishRecordingAsDrawable();
    SkBinaryWriteBuffer writeBuffer({});
    writeBuffer.writeFlattenable(recordedDrawable.get());

    // Copy the contents of the write buffer into a read buffer
    sk_sp<SkData> data = SkData::MakeUninitialized(writeBuffer.bytesWritten());
    writeBuffer.writeToMemory(data->writable_data());
    SkReadBuffer readBuffer(data->data(), data->size());

    // Deserialize and verify the drawable
    sk_sp<SkDrawable> out((SkDrawable*)readBuffer.readFlattenable(SkFlattenable::kSkDrawable_Type));
    REPORTER_ASSERT(r, out);
    REPORTER_ASSERT(r, !strcmp("SkRecordedDrawable", out->getTypeName()));
}

// be sure these constructs compile, don't assert, and return null
DEF_TEST(Flattenable_EmptyDeserialze, reporter) {
    auto data = SkData::MakeEmpty();

    #define test(name)  REPORTER_ASSERT(reporter, !name::Deserialize(data->data(), data->size()))
    test(SkPathEffectBase);
    test(SkMaskFilter);
    test(SkShaderBase); // todo: make this just be shader!
    test(SkColorFilterBase);
    test(SkImageFilter);
    #undef test
}