/*
 * Copyright 2022 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 <gtest/gtest.h>

#include <fstream>
#include <iostream>

#include "ultrahdr/ultrahdrcommon.h"
#include "ultrahdr/jpegdecoderhelper.h"
#include "ultrahdr/icc.h"

namespace ultrahdr {

// minnie-320x240-yuv.jpg & minnie-320x240-y.jpg has no icc or exif
// minnie-320x240-yuv-icc.jpg has icc
#ifdef __ANDROID__
#define YUV_IMAGE "/data/local/tmp/minnie-320x240-yuv.jpg"
#define RGB_IMAGE "/data/local/tmp/minnie-320x240-rgb.jpg"
#define YUV_ICC_IMAGE "/data/local/tmp/minnie-320x240-yuv-icc.jpg"
#define GREY_IMAGE "/data/local/tmp/minnie-320x240-y.jpg"
#else
#define YUV_IMAGE "./data/minnie-320x240-yuv.jpg"
#define RGB_IMAGE "./data/minnie-320x240-rgb.jpg"
#define YUV_ICC_IMAGE "./data/minnie-320x240-yuv-icc.jpg"
#define GREY_IMAGE "./data/minnie-320x240-y.jpg"
#endif
#define YUV_IMAGE_SIZE 20193
#define RGB_IMAGE_SIZE 20200
#define YUV_ICC_IMAGE_SIZE 34266
#define GREY_IMAGE_SIZE 20193
#define IMAGE_WIDTH 320
#define IMAGE_HEIGHT 240

class JpegDecoderHelperTest : public testing::Test {
 public:
  struct Image {
    std::unique_ptr<uint8_t[]> buffer;
    size_t size;
  };
  JpegDecoderHelperTest();
  ~JpegDecoderHelperTest();

 protected:
  virtual void SetUp();
  virtual void TearDown();

  Image mYuvImage, mYuvIccImage, mGreyImage, mRgbImage;
};

JpegDecoderHelperTest::JpegDecoderHelperTest() {}

JpegDecoderHelperTest::~JpegDecoderHelperTest() {}

static bool loadFile(const char filename[], JpegDecoderHelperTest::Image* result) {
  std::ifstream ifd(filename, std::ios::binary | std::ios::ate);
  if (ifd.good()) {
    int size = ifd.tellg();
    ifd.seekg(0, std::ios::beg);
    result->buffer.reset(new uint8_t[size]);
    ifd.read(reinterpret_cast<char*>(result->buffer.get()), size);
    ifd.close();
    return true;
  }
  return false;
}

void JpegDecoderHelperTest::SetUp() {
  if (!loadFile(YUV_IMAGE, &mYuvImage)) {
    FAIL() << "Load file " << YUV_IMAGE << " failed";
  }
  mYuvImage.size = YUV_IMAGE_SIZE;
  if (!loadFile(YUV_ICC_IMAGE, &mYuvIccImage)) {
    FAIL() << "Load file " << YUV_ICC_IMAGE << " failed";
  }
  mYuvIccImage.size = YUV_ICC_IMAGE_SIZE;
  if (!loadFile(GREY_IMAGE, &mGreyImage)) {
    FAIL() << "Load file " << GREY_IMAGE << " failed";
  }
  mGreyImage.size = GREY_IMAGE_SIZE;
  if (!loadFile(RGB_IMAGE, &mRgbImage)) {
    FAIL() << "Load file " << RGB_IMAGE << " failed";
  }
  mRgbImage.size = RGB_IMAGE_SIZE;
}

void JpegDecoderHelperTest::TearDown() {}

TEST_F(JpegDecoderHelperTest, decodeYuvImage) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.decompressImage(mYuvImage.buffer.get(), mYuvImage.size));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
  EXPECT_EQ(IccHelper::readIccColorGamut(decoder.getICCPtr(), decoder.getICCSize()),
            ULTRAHDR_COLORGAMUT_UNSPECIFIED);
}

TEST_F(JpegDecoderHelperTest, decodeYuvImageToRgba) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.decompressImage(mYuvImage.buffer.get(), mYuvImage.size, DECODE_TO_RGB_CS));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
  EXPECT_EQ(IccHelper::readIccColorGamut(decoder.getICCPtr(), decoder.getICCSize()),
            ULTRAHDR_COLORGAMUT_UNSPECIFIED);
}

TEST_F(JpegDecoderHelperTest, decodeYuvIccImage) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.decompressImage(mYuvIccImage.buffer.get(), mYuvIccImage.size));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
  EXPECT_EQ(IccHelper::readIccColorGamut(decoder.getICCPtr(), decoder.getICCSize()),
            ULTRAHDR_COLORGAMUT_BT709);
}

TEST_F(JpegDecoderHelperTest, decodeGreyImage) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.decompressImage(mGreyImage.buffer.get(), mGreyImage.size));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
  EXPECT_TRUE(decoder.decompressImage(mGreyImage.buffer.get(), mGreyImage.size, DECODE_STREAM));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
}

TEST_F(JpegDecoderHelperTest, decodeRgbImageToRgba) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.decompressImage(mRgbImage.buffer.get(), mRgbImage.size, DECODE_STREAM));
  ASSERT_GT(decoder.getDecompressedImageSize(), static_cast<uint32_t>(0));
  EXPECT_EQ(IccHelper::readIccColorGamut(decoder.getICCPtr(), decoder.getICCSize()),
            ULTRAHDR_COLORGAMUT_UNSPECIFIED);
}

TEST_F(JpegDecoderHelperTest, getCompressedImageParameters) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.parseImage(mYuvImage.buffer.get(), mYuvImage.size));
  EXPECT_EQ(IMAGE_WIDTH, decoder.getDecompressedImageWidth());
  EXPECT_EQ(IMAGE_HEIGHT, decoder.getDecompressedImageHeight());
  EXPECT_EQ(decoder.getICCSize(), 0);
  EXPECT_EQ(decoder.getEXIFSize(), 0);
}

TEST_F(JpegDecoderHelperTest, getCompressedImageParametersIcc) {
  JpegDecoderHelper decoder;
  EXPECT_TRUE(decoder.parseImage(mYuvIccImage.buffer.get(), mYuvIccImage.size));
  EXPECT_EQ(IMAGE_WIDTH, decoder.getDecompressedImageWidth());
  EXPECT_EQ(IMAGE_HEIGHT, decoder.getDecompressedImageHeight());
  EXPECT_GT(decoder.getICCSize(), 0);
  EXPECT_GT(decoder.getEXIFSize(), 0);
  EXPECT_EQ(IccHelper::readIccColorGamut(decoder.getICCPtr(), decoder.getICCSize()),
            ULTRAHDR_COLORGAMUT_BT709);
}

}  // namespace ultrahdr