#include "llvm/Object/OffloadBinary.h"

#include "llvm/Testing/Support/Error.h"
#include "gtest/gtest.h"
#include <random>

using namespace llvm;
using namespace llvm::object;

TEST(OffloadingTest, checkOffloadingBinary) {
  // Create random data to fill the image.
  std::mt19937 Rng(std::random_device{}());
  std::uniform_int_distribution<uint64_t> SizeDist(0, 256);
  std::uniform_int_distribution<uint16_t> KindDist(0);
  std::uniform_int_distribution<uint16_t> BinaryDist(
      std::numeric_limits<uint8_t>::min(), std::numeric_limits<uint8_t>::max());
  std::uniform_int_distribution<int16_t> StringDist('!', '~');
  std::vector<uint8_t> Image(SizeDist(Rng));
  std::generate(Image.begin(), Image.end(), [&]() { return BinaryDist(Rng); });
  std::vector<std::pair<std::string, std::string>> Strings(SizeDist(Rng));
  for (auto &KeyAndValue : Strings) {
    std::string Key(SizeDist(Rng), '\0');
    std::string Value(SizeDist(Rng), '\0');

    std::generate(Key.begin(), Key.end(), [&]() { return StringDist(Rng); });
    std::generate(Value.begin(), Value.end(),
                  [&]() { return StringDist(Rng); });

    KeyAndValue = std::make_pair(Key, Value);
  }

  // Create the image.
  StringMap<StringRef> StringData;
  for (auto &KeyAndValue : Strings)
    StringData[KeyAndValue.first] = KeyAndValue.second;
  std::unique_ptr<MemoryBuffer> ImageData = MemoryBuffer::getMemBuffer(
      {reinterpret_cast<char *>(Image.data()), Image.size()}, "", false);

  OffloadBinary::OffloadingImage Data;
  Data.TheImageKind = static_cast<ImageKind>(KindDist(Rng));
  Data.TheOffloadKind = static_cast<OffloadKind>(KindDist(Rng));
  Data.Flags = KindDist(Rng);
  Data.StringData = StringData;
  Data.Image = std::move(ImageData);

  auto BinaryBuffer = OffloadBinary::write(Data);

  auto BinaryOrErr = OffloadBinary::create(*BinaryBuffer);
  if (!BinaryOrErr)
    FAIL();

  // Make sure we get the same data out.
  auto &Binary = **BinaryOrErr;
  ASSERT_EQ(Data.TheImageKind, Binary.getImageKind());
  ASSERT_EQ(Data.TheOffloadKind, Binary.getOffloadKind());
  ASSERT_EQ(Data.Flags, Binary.getFlags());

  for (auto &KeyAndValue : Strings)
    ASSERT_TRUE(StringData[KeyAndValue.first] ==
                Binary.getString(KeyAndValue.first));

  EXPECT_TRUE(Data.Image->getBuffer() == Binary.getImage());

  // Ensure the size and alignment of the data is correct.
  EXPECT_TRUE(Binary.getSize() % OffloadBinary::getAlignment() == 0);
  EXPECT_TRUE(Binary.getSize() == BinaryBuffer->getBuffer().size());
}