/*

 * Copyright 2023 The Android Open Source Project

 *

 * Licensed 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

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <fuzzer/FuzzedDataProvider.h>

#include <algorithm>

#include <iostream>

#include <memory>

#include <random>

#include "ultrahdr/ultrahdrcommon.h"

#include "ultrahdr/gainmapmath.h"

#include "ultrahdr/jpegr.h"

using namespace ultrahdr;

// Color gamuts for image data, sync with ultrahdr.h

const int kCgMin = ULTRAHDR_COLORGAMUT_UNSPECIFIED;

const int kCgMax = ULTRAHDR_COLORGAMUT_BT2100;

// Transfer functions for image data, sync with ultrahdr.h

const int kTfMin = ULTRAHDR_TF_UNSPECIFIED;

const int kTfMax = ULTRAHDR_TF_SRGB;

// Transfer functions for image data, sync with ultrahdr.h

const int kOfMin = ULTRAHDR_OUTPUT_UNSPECIFIED;

const int kOfMax = ULTRAHDR_OUTPUT_HDR_HLG;

// quality factor

const int kQfMin = -10;

const int kQfMax = 110;

class UltraHdrEncFuzzer {

 public:

  UltraHdrEncFuzzer(const uint8_t* data, size_t size) : mFdp(data, size) {};

  void process();

  template <typename T>

  void fillBuffer(T* data, int width, int height, int stride);

 private:

  FuzzedDataProvider mFdp;

};

template <typename T>

void UltraHdrEncFuzzer::fillBuffer(T* data, int width, int height, int stride) {

  if (!mFdp.remaining_bytes()) return;

  T* tmp = data;

  std::vector<T> buffer(width);

  for (int i = 0; i < buffer.size(); i++) {

    buffer[i] = mFdp.ConsumeIntegral<T>();

  }

  for (int j = 0; j < height; j++) {

    for (int i = 0; i < width; i += buffer.size()) {

      memcpy(tmp + i, buffer.data(), std::min((int)buffer.size(), (width - i)) * sizeof(*data));

      std::shuffle(buffer.begin(), buffer.end(),

                   std::default_random_engine(std::random_device{}()));

    }

    tmp += stride;

  }

}

void UltraHdrEncFuzzer::fillBuffer<unsigned short>(unsigned short*, int, int, int)

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void UltraHdrEncFuzzer::fillBuffer(T* data, int width, int height, int stride) {

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  if (!mFdp.remaining_bytes()) return;

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  T* tmp = data;

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  std::vector<T> buffer(width);

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  for (int i = 0; i < buffer.size(); i++) {

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    buffer[i] = mFdp.ConsumeIntegral<T>();

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  }

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  for (int j = 0; j < height; j++) {

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    for (int i = 0; i < width; i += buffer.size()) {

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      memcpy(tmp + i, buffer.data(), std::min((int)buffer.size(), (width - i)) * sizeof(*data));

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      std::shuffle(buffer.begin(), buffer.end(),

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                   std::default_random_engine(std::random_device{}()));

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    }

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    tmp += stride;

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  }

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}

void UltraHdrEncFuzzer::fillBuffer<unsigned char>(unsigned char*, int, int, int)

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void UltraHdrEncFuzzer::fillBuffer(T* data, int width, int height, int stride) {

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  if (!mFdp.remaining_bytes()) return;

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  T* tmp = data;

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  std::vector<T> buffer(width);

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  for (int i = 0; i < buffer.size(); i++) {

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    buffer[i] = mFdp.ConsumeIntegral<T>();

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  }

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  for (int j = 0; j < height; j++) {

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    for (int i = 0; i < width; i += buffer.size()) {

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      memcpy(tmp + i, buffer.data(), std::min((int)buffer.size(), (width - i)) * sizeof(*data));

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      std::shuffle(buffer.begin(), buffer.end(),

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                   std::default_random_engine(std::random_device{}()));

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    }

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    tmp += stride;

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  }

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}

void UltraHdrEncFuzzer::process() {

  if (mFdp.remaining_bytes()) {

    struct jpegr_uncompressed_struct p010Img{};

    struct jpegr_uncompressed_struct yuv420Img{};

    struct jpegr_uncompressed_struct grayImg{};

    struct jpegr_compressed_struct jpegImgR{};

    struct jpegr_compressed_struct jpegImg{};

    struct jpegr_compressed_struct jpegGainMap{};

    // which encode api to select

    int muxSwitch = mFdp.ConsumeIntegralInRange<int>(0, 4);

    // quality factor

    int quality = mFdp.ConsumeIntegralInRange<int>(kQfMin, kQfMax);

    // hdr_tf

    auto tf =

        static_cast<ultrahdr_transfer_function>(mFdp.ConsumeIntegralInRange<int>(kTfMin, kTfMax));

    // p010 Cg

    auto p010Cg =

        static_cast<ultrahdr_color_gamut>(mFdp.ConsumeIntegralInRange<int>(kCgMin, kCgMax));

    // 420 Cg

    auto yuv420Cg =

        static_cast<ultrahdr_color_gamut>(mFdp.ConsumeIntegralInRange<int>(kCgMin, kCgMax));

    // hdr_of

    auto of = static_cast<ultrahdr_output_format>(mFdp.ConsumeIntegralInRange<int>(kOfMin, kOfMax));

    int width = mFdp.ConsumeIntegralInRange<int>(kMinWidth, kMaxWidth);

    width = (width >> 1) << 1;

    int height = mFdp.ConsumeIntegralInRange<int>(kMinHeight, kMaxHeight);

    height = (height >> 1) << 1;

    // gain_map quality factor

    auto gainmap_quality = mFdp.ConsumeIntegral<int8_t>();

    // multi channel gainmap

    auto multi_channel_gainmap = mFdp.ConsumeIntegral<int8_t>();

    // gainmap scale factor

    auto gm_scale_factor = mFdp.ConsumeIntegralInRange<int16_t>(-32, 192);

    // encoding speed preset

    auto enc_preset = mFdp.ConsumeBool() ? UHDR_USAGE_REALTIME : UHDR_USAGE_BEST_QUALITY;

    // gainmap metadata

    auto minBoost = mFdp.ConsumeFloatingPointInRange<float>(-4.0f, 64.0f);

    auto maxBoost = mFdp.ConsumeFloatingPointInRange<float>(-4.0f, 64.0f);

    auto gamma = mFdp.ConsumeFloatingPointInRange<float>(-1.0f, 5);

    auto offsetSdr = mFdp.ConsumeFloatingPointInRange<float>(-1.0f, 1.0f);

    auto offsetHdr = mFdp.ConsumeFloatingPointInRange<float>(-1.0f, 1.0f);

    auto minCapacity = mFdp.ConsumeFloatingPointInRange<float>(-4.0f, 48.0f);

    auto maxCapacity = mFdp.ConsumeFloatingPointInRange<float>(-4.0f, 48.0f);

    // target display peak brightness

    auto targetDispPeakBrightness = mFdp.ConsumeFloatingPointInRange<float>(100.0f, 10500.0f);

    // raw buffer config

    bool hasP010Stride = mFdp.ConsumeBool();

    size_t yP010Stride = mFdp.ConsumeIntegralInRange<uint16_t>(width, width + 128);

    if (!hasP010Stride) yP010Stride = width;

    bool isP010UVContiguous = mFdp.ConsumeBool();

    bool hasP010UVStride = mFdp.ConsumeBool();

    size_t uvP010Stride = mFdp.ConsumeIntegralInRange<uint16_t>(width, width + 128);

    if (!hasP010UVStride) uvP010Stride = width;

    bool hasYuv420Stride = mFdp.ConsumeBool();

    size_t yYuv420Stride = mFdp.ConsumeIntegralInRange<uint16_t>(width, width + 128);

    if (!hasYuv420Stride) yYuv420Stride = width;

    bool isYuv420UVContiguous = mFdp.ConsumeBool();

    bool hasYuv420UVStride = mFdp.ConsumeBool();

    size_t uvYuv420Stride = mFdp.ConsumeIntegralInRange<uint16_t>(width / 2, width / 2 + 128);

    if (!hasYuv420UVStride) uvYuv420Stride = width / 2;

    // display boost

    float displayBoost = mFdp.ConsumeFloatingPointInRange<float>(1.0, FLT_MAX);

    std::unique_ptr<uint16_t[]> bufferYHdr = nullptr;

    std::unique_ptr<uint16_t[]> bufferUVHdr = nullptr;

    std::unique_ptr<uint8_t[]> bufferYSdr = nullptr;

    std::unique_ptr<uint8_t[]> bufferUVSdr = nullptr;

    std::unique_ptr<uint8_t[]> grayImgRaw = nullptr;

    if (muxSwitch != 4) {

      // init p010 image

      p010Img.width = width;

      p010Img.height = height;

      p010Img.colorGamut = p010Cg;

      p010Img.luma_stride = yP010Stride;

      if (isP010UVContiguous) {

        size_t p010Size = yP010Stride * height * 3 / 2;

        bufferYHdr = std::make_unique<uint16_t[]>(p010Size);

        p010Img.data = bufferYHdr.get();

        p010Img.chroma_data = nullptr;

        p010Img.chroma_stride = 0;

        fillBuffer<uint16_t>(bufferYHdr.get(), width, height, yP010Stride);

        fillBuffer<uint16_t>(bufferYHdr.get() + yP010Stride * height, width, height / 2,

                             yP010Stride);

      } else {

        size_t p010YSize = yP010Stride * height;

        bufferYHdr = std::make_unique<uint16_t[]>(p010YSize);

        p010Img.data = bufferYHdr.get();

        fillBuffer<uint16_t>(bufferYHdr.get(), width, height, yP010Stride);

        size_t p010UVSize = uvP010Stride * p010Img.height / 2;

        bufferUVHdr = std::make_unique<uint16_t[]>(p010UVSize);

        p010Img.chroma_data = bufferUVHdr.get();

        p010Img.chroma_stride = uvP010Stride;

        fillBuffer<uint16_t>(bufferUVHdr.get(), width, height / 2, uvP010Stride);

      }

    } else {

      size_t map_width = width / kMapDimensionScaleFactorDefault;

      size_t map_height = height / kMapDimensionScaleFactorDefault;

      // init 400 image

      grayImg.width = map_width;

      grayImg.height = map_height;

      grayImg.colorGamut = ULTRAHDR_COLORGAMUT_UNSPECIFIED;

      const size_t graySize = map_width * map_height;

      grayImgRaw = std::make_unique<uint8_t[]>(graySize);

      grayImg.data = grayImgRaw.get();

      fillBuffer<uint8_t>(grayImgRaw.get(), map_width, map_height, map_width);

      grayImg.chroma_data = nullptr;

      grayImg.luma_stride = 0;

      grayImg.chroma_stride = 0;

    }

    if (muxSwitch > 0) {

      // init 420 image

      yuv420Img.width = width;

      yuv420Img.height = height;

      yuv420Img.colorGamut = yuv420Cg;

      yuv420Img.luma_stride = yYuv420Stride;

      if (isYuv420UVContiguous) {

        size_t yuv420Size = yYuv420Stride * height * 3 / 2;

        bufferYSdr = std::make_unique<uint8_t[]>(yuv420Size);

        yuv420Img.data = bufferYSdr.get();

        yuv420Img.chroma_data = nullptr;

        yuv420Img.chroma_stride = 0;

        fillBuffer<uint8_t>(bufferYSdr.get(), width, height, yYuv420Stride);

        fillBuffer<uint8_t>(bufferYSdr.get() + yYuv420Stride * height, width / 2, height / 2,

                            yYuv420Stride / 2);

        fillBuffer<uint8_t>(bufferYSdr.get() + yYuv420Stride * height * 5 / 4, width / 2,

                            height / 2, yYuv420Stride / 2);

      } else {

        size_t yuv420YSize = yYuv420Stride * height;

        bufferYSdr = std::make_unique<uint8_t[]>(yuv420YSize);

        yuv420Img.data = bufferYSdr.get();

        fillBuffer<uint8_t>(bufferYSdr.get(), width, height, yYuv420Stride);

        size_t yuv420UVSize = uvYuv420Stride * yuv420Img.height / 2 * 2;

        bufferUVSdr = std::make_unique<uint8_t[]>(yuv420UVSize);

        yuv420Img.chroma_data = bufferUVSdr.get();

        yuv420Img.chroma_stride = uvYuv420Stride;

        fillBuffer<uint8_t>(bufferUVSdr.get(), width / 2, height / 2, uvYuv420Stride);

        fillBuffer<uint8_t>(bufferUVSdr.get() + uvYuv420Stride * height / 2, width / 2, height / 2,

                            uvYuv420Stride);

      }

    }

    // dest

    // 2 * p010 size as input data is random, DCT compression might not behave as expected

    jpegImgR.maxLength = std::max(64 * 1024 /* min size 8kb */, width * height * 3 * 2);

    auto jpegImgRaw = std::make_unique<uint8_t[]>(jpegImgR.maxLength);

    jpegImgR.data = jpegImgRaw.get();

// #define DUMP_PARAM

#ifdef DUMP_PARAM

    std::cout << "Api Select " << muxSwitch << std::endl;

    std::cout << "image dimensions " << width << " x " << height << std::endl;

    std::cout << "p010 color gamut " << p010Img.colorGamut << std::endl;

    std::cout << "p010 luma stride " << p010Img.luma_stride << std::endl;

    std::cout << "p010 chroma stride " << p010Img.chroma_stride << std::endl;

    std::cout << "420 color gamut " << yuv420Img.colorGamut << std::endl;

    std::cout << "420 luma stride " << yuv420Img.luma_stride << std::endl;

    std::cout << "420 chroma stride " << yuv420Img.chroma_stride << std::endl;

    std::cout << "quality factor " << quality << std::endl;

#endif

    JpegR jpegHdr(nullptr, gm_scale_factor, gainmap_quality, multi_channel_gainmap, gamma,

                  enc_preset, minBoost, maxBoost, targetDispPeakBrightness);

    status_t status = JPEGR_UNKNOWN_ERROR;

    if (muxSwitch == 0) {  // api 0

      jpegImgR.length = 0;

      status = jpegHdr.encodeJPEGR(&p010Img, tf, &jpegImgR, quality, nullptr);

    } else if (muxSwitch == 1) {  // api 1

      jpegImgR.length = 0;

      status = jpegHdr.encodeJPEGR(&p010Img, &yuv420Img, tf, &jpegImgR, quality, nullptr);

    } else {

      // compressed img

      JpegEncoderHelper encoder;

      struct jpegr_uncompressed_struct yuv420ImgCopy = yuv420Img;

      if (yuv420ImgCopy.luma_stride == 0) yuv420ImgCopy.luma_stride = yuv420Img.width;

      if (!yuv420ImgCopy.chroma_data) {

        uint8_t* data = reinterpret_cast<uint8_t*>(yuv420Img.data);

        yuv420ImgCopy.chroma_data = data + yuv420Img.luma_stride * yuv420Img.height;

        yuv420ImgCopy.chroma_stride = yuv420Img.luma_stride >> 1;

      }

      const uint8_t* planes[3]{reinterpret_cast<uint8_t*>(yuv420ImgCopy.data),

                               reinterpret_cast<uint8_t*>(yuv420ImgCopy.chroma_data),

                               reinterpret_cast<uint8_t*>(yuv420ImgCopy.chroma_data) +

                                   yuv420ImgCopy.chroma_stride * yuv420ImgCopy.height / 2};

      const unsigned int strides[3]{yuv420ImgCopy.luma_stride, yuv420ImgCopy.chroma_stride,

                                    yuv420ImgCopy.chroma_stride};

      if (encoder

              .compressImage(planes, strides, yuv420ImgCopy.width, yuv420ImgCopy.height,

                             UHDR_IMG_FMT_12bppYCbCr420, quality, nullptr, 0)

              .error_code == UHDR_CODEC_OK) {

        jpegImg.length = encoder.getCompressedImageSize();

        jpegImg.maxLength = jpegImg.length;

        jpegImg.data = encoder.getCompressedImagePtr();

        jpegImg.colorGamut = yuv420Cg;

        if (muxSwitch == 2) {  // api 2

          jpegImgR.length = 0;

          status = jpegHdr.encodeJPEGR(&p010Img, &yuv420Img, &jpegImg, tf, &jpegImgR);

        } else if (muxSwitch == 3) {  // api 3

          jpegImgR.length = 0;

          status = jpegHdr.encodeJPEGR(&p010Img, &jpegImg, tf, &jpegImgR);

        } else if (muxSwitch == 4) {  // api 4

          jpegImgR.length = 0;

          JpegEncoderHelper gainMapEncoder;

          const uint8_t* planeGm[1]{reinterpret_cast<uint8_t*>(grayImg.data)};

          const unsigned int strideGm[1]{grayImg.width};

          if (gainMapEncoder

                  .compressImage(planeGm, strideGm, grayImg.width, grayImg.height,

                                 UHDR_IMG_FMT_8bppYCbCr400, quality, nullptr, 0)

                  .error_code == UHDR_CODEC_OK) {

            jpegGainMap.length = gainMapEncoder.getCompressedImageSize();

            jpegGainMap.maxLength = jpegImg.length;

            jpegGainMap.data = gainMapEncoder.getCompressedImagePtr();

            jpegGainMap.colorGamut = ULTRAHDR_COLORGAMUT_UNSPECIFIED;

            ultrahdr_metadata_struct metadata;

            metadata.version = kJpegrVersion;

            metadata.maxContentBoost = maxBoost;

            metadata.minContentBoost = minBoost;

            metadata.gamma = gamma;

            metadata.offsetSdr = offsetSdr;

            metadata.offsetHdr = offsetHdr;

            metadata.hdrCapacityMin = minCapacity;

            metadata.hdrCapacityMax = maxCapacity;

            status = jpegHdr.encodeJPEGR(&jpegImg, &jpegGainMap, &metadata, &jpegImgR);

          }

        }

      }

    }

    if (status == JPEGR_NO_ERROR) {

      jpegr_info_struct info{};

      status = jpegHdr.getJPEGRInfo(&jpegImgR, &info);

      if (status == JPEGR_NO_ERROR) {

        size_t outSize = info.width * info.height * ((of == ULTRAHDR_OUTPUT_HDR_LINEAR) ? 8 : 4);

        jpegr_uncompressed_struct decodedJpegR;

        auto decodedRaw = std::make_unique<uint8_t[]>(outSize);

        decodedJpegR.data = decodedRaw.get();

        ultrahdr_metadata_struct metadata;

        status = jpegHdr.decodeJPEGR(&jpegImgR, &decodedJpegR, displayBoost, nullptr, of, nullptr,

                                     &metadata);

        if (status != JPEGR_NO_ERROR) {

          ALOGE("encountered error during decoding %d", status);

        }

      } else {

        ALOGE("encountered error during get jpeg info %d", status);

      }

    } else {

      ALOGE("encountered error during encoding %d", status);

    }

  }

}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {

  UltraHdrEncFuzzer fuzzHandle(data, size);

  fuzzHandle.process();

  return 0;

}