// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "third_party/blink/renderer/platform/blob/blob_data.h"

#include <memory>
#include <utility>

#include "base/functional/bind.h"
#include "base/run_loop.h"
#include "base/test/task_environment.h"
#include "mojo/public/cpp/bindings/receiver.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/mojom/blob/blob.mojom-blink.h"
#include "third_party/blink/public/mojom/blob/blob_registry.mojom-blink.h"
#include "third_party/blink/public/mojom/blob/file_backed_blob_factory.mojom-blink.h"
#include "third_party/blink/public/platform/file_path_conversion.h"
#include "third_party/blink/renderer/platform/blob/blob_bytes_provider.h"
#include "third_party/blink/renderer/platform/blob/testing/fake_blob_registry.h"
#include "third_party/blink/renderer/platform/blob/testing/fake_file_backed_blob_factory.h"
#include "third_party/blink/renderer/platform/testing/testing_platform_support.h"
#include "third_party/blink/renderer/platform/wtf/functional.h"
#include "third_party/blink/renderer/platform/wtf/uuid.h"

namespace blink {

using mojom::blink::Blob;
using mojom::blink::BlobRegistry;
using mojom::blink::DataElement;
using mojom::blink::DataElementBlob;
using mojom::blink::DataElementBytes;
using mojom::blink::DataElementFile;
using mojom::blink::DataElementPtr;
using mojom::blink::FileBackedBlobFactory;

namespace {

struct ExpectedElement {
  DataElementPtr element;
  String blob_uuid;
  Vector<uint8_t> large_data;

  static ExpectedElement EmbeddedBytes(Vector<uint8_t> embedded_data) {
    uint64_t size = embedded_data.size();
    return ExpectedElement{DataElement::NewBytes(DataElementBytes::New(
        size, std::move(embedded_data), mojo::NullRemote()))};
  }

  static ExpectedElement LargeBytes(Vector<uint8_t> data) {
    uint64_t size = data.size();
    return ExpectedElement{DataElement::NewBytes(DataElementBytes::New(
                               size, std::nullopt, mojo::NullRemote())),
                           String(), std::move(data)};
  }

  static ExpectedElement File(const String& path,
                              uint64_t offset,
                              uint64_t length,
                              base::Time time) {
    return ExpectedElement{DataElement::NewFile(
        DataElementFile::New(WebStringToFilePath(path), offset, length, time))};
  }

  static ExpectedElement Blob(const String& uuid,
                              uint64_t offset,
                              uint64_t length) {
    return ExpectedElement{DataElement::NewBlob(DataElementBlob::New(
                               mojo::NullRemote(), offset, length)),
                           uuid};
  }
};

}  // namespace

class BlobDataHandleTest : public testing::Test {
 public:
  BlobDataHandleTest()
      : blob_registry_receiver_(
            &mock_blob_registry_,
            blob_registry_remote_.BindNewPipeAndPassReceiver()) {
    BlobDataHandle::SetBlobRegistryForTesting(blob_registry_remote_.get());
  }

  ~BlobDataHandleTest() override {
    BlobDataHandle::SetBlobRegistryForTesting(nullptr);
  }

  void SetUp() override {
    Platform::SetMainThreadTaskRunnerForTesting();

    small_test_data_.resize(1024);
    medium_test_data_.resize(1024 * 32);
    large_test_data_.resize(1024 * 512);
    for (wtf_size_t i = 0; i < small_test_data_.size(); ++i)
      small_test_data_[i] = i;
    for (wtf_size_t i = 0; i < medium_test_data_.size(); ++i)
      medium_test_data_[i] = i % 191;
    for (wtf_size_t i = 0; i < large_test_data_.size(); ++i)
      large_test_data_[i] = i % 251;

    ASSERT_LT(small_test_data_.size(),
              BlobBytesProvider::kMaxConsolidatedItemSizeInBytes);
    ASSERT_LT(medium_test_data_.size(),
              DataElementBytes::kMaximumEmbeddedDataSize);
    ASSERT_GT(medium_test_data_.size(),
              BlobBytesProvider::kMaxConsolidatedItemSizeInBytes);
    ASSERT_GT(large_test_data_.size(),
              DataElementBytes::kMaximumEmbeddedDataSize);

    empty_blob_ = BlobDataHandle::Create();

    auto test_data = std::make_unique<BlobData>();
    test_data->AppendBytes(large_test_data_);
    test_blob_ =
        BlobDataHandle::Create(std::move(test_data), large_test_data_.size());

    blob_registry_remote_.FlushForTesting();
    ASSERT_EQ(2u, mock_blob_registry_.registrations.size());
    empty_blob_uuid_ = mock_blob_registry_.registrations[0].uuid;
    test_blob_uuid_ = mock_blob_registry_.registrations[1].uuid;
    mock_blob_registry_.registrations.clear();
  }

  void TearDown() override {
    task_environment_.RunUntilIdle();
    Platform::UnsetMainThreadTaskRunnerForTesting();
  }

  void TestCreateBlob(std::unique_ptr<BlobData> data,
                      Vector<ExpectedElement> expected_elements) {
    uint64_t blob_size = data->length();
    String type = data->ContentType();
    bool is_single_unknown_size_file = data->IsSingleUnknownSizeFile();

    scoped_refptr<BlobDataHandle> handle =
        BlobDataHandle::Create(std::move(data), blob_size);
    EXPECT_EQ(blob_size, handle->size());
    EXPECT_EQ(type, handle->GetType());
    EXPECT_EQ(is_single_unknown_size_file, handle->IsSingleUnknownSizeFile());

    blob_registry_remote_.FlushForTesting();
    ASSERT_EQ(1u, mock_blob_registry_.registrations.size());
    auto& reg = mock_blob_registry_.registrations[0];
    EXPECT_EQ(handle->Uuid(), reg.uuid);
    EXPECT_EQ(type.IsNull() ? "" : type, reg.content_type);
    EXPECT_EQ("", reg.content_disposition);
    ASSERT_EQ(expected_elements.size(), reg.elements.size());
    for (wtf_size_t i = 0; i < expected_elements.size(); ++i) {
      const auto& expected = expected_elements[i].element;
      auto& actual = reg.elements[i];
      if (expected->is_bytes()) {
        ASSERT_TRUE(actual->is_bytes());
        EXPECT_EQ(expected->get_bytes()->length, actual->get_bytes()->length);
        EXPECT_EQ(expected->get_bytes()->embedded_data,
                  actual->get_bytes()->embedded_data);

        base::RunLoop loop;
        Vector<uint8_t> received_bytes;
        mojo::Remote<mojom::blink::BytesProvider> actual_data(
            std::move(actual->get_bytes()->data));
        actual_data->RequestAsReply(WTF::BindOnce(
            [](base::RepeatingClosure quit_closure, Vector<uint8_t>* bytes_out,
               const Vector<uint8_t>& bytes) {
              *bytes_out = bytes;
              quit_closure.Run();
            },
            loop.QuitClosure(), WTF::Unretained(&received_bytes)));
        loop.Run();
        if (expected->get_bytes()->embedded_data)
          EXPECT_EQ(expected->get_bytes()->embedded_data, received_bytes);
        else
          EXPECT_EQ(expected_elements[i].large_data, received_bytes);
      } else if (expected->is_file()) {
        ASSERT_TRUE(actual->is_file());
        EXPECT_EQ(expected->get_file()->path, actual->get_file()->path);
        EXPECT_EQ(expected->get_file()->length, actual->get_file()->length);
        EXPECT_EQ(expected->get_file()->offset, actual->get_file()->offset);
        EXPECT_EQ(expected->get_file()->expected_modification_time,
                  actual->get_file()->expected_modification_time);
      } else if (expected->is_blob()) {
        ASSERT_TRUE(actual->is_blob());
        EXPECT_EQ(expected->get_blob()->length, actual->get_blob()->length);
        EXPECT_EQ(expected->get_blob()->offset, actual->get_blob()->offset);

        base::RunLoop loop;
        String received_uuid;
        mojo::Remote<mojom::blink::Blob> blob(
            std::move(actual->get_blob()->blob));
        blob->GetInternalUUID(base::BindOnce(
            [](base::RepeatingClosure quit_closure, String* uuid_out,
               const String& uuid) {
              *uuid_out = uuid;
              quit_closure.Run();
            },
            loop.QuitClosure(), &received_uuid));
        loop.Run();
        EXPECT_EQ(expected_elements[i].blob_uuid, received_uuid);
      }
    }
    mock_blob_registry_.registrations.clear();
  }

 protected:
  base::test::TaskEnvironment task_environment_;
  FakeBlobRegistry mock_blob_registry_;
  mojo::Remote<BlobRegistry> blob_registry_remote_;
  mojo::Receiver<BlobRegistry> blob_registry_receiver_;

  // Significantly less than BlobData's kMaxConsolidatedItemSizeInBytes.
  Vector<uint8_t> small_test_data_;
  // Larger than kMaxConsolidatedItemSizeInBytes, but smaller than
  // max_data_population.
  Vector<uint8_t> medium_test_data_;
  // Larger than max_data_population.
  Vector<uint8_t> large_test_data_;
  scoped_refptr<BlobDataHandle> empty_blob_;
  String empty_blob_uuid_;
  scoped_refptr<BlobDataHandle> test_blob_;
  String test_blob_uuid_;
};

TEST_F(BlobDataHandleTest, CreateEmpty) {
  scoped_refptr<BlobDataHandle> handle = BlobDataHandle::Create();
  EXPECT_TRUE(handle->GetType().IsNull());
  EXPECT_EQ(0u, handle->size());
  EXPECT_FALSE(handle->IsSingleUnknownSizeFile());

  blob_registry_remote_.FlushForTesting();
  ASSERT_EQ(1u, mock_blob_registry_.registrations.size());
  const auto& reg = mock_blob_registry_.registrations[0];
  EXPECT_EQ(handle->Uuid(), reg.uuid);
  EXPECT_EQ("", reg.content_type);
  EXPECT_EQ("", reg.content_disposition);
  EXPECT_EQ(0u, reg.elements.size());
}

TEST_F(BlobDataHandleTest, CreateFromEmptyData) {
  String kType = "content/type";

  auto data = std::make_unique<BlobData>();
  data->SetContentType(kType);

  TestCreateBlob(std::move(data), {});
}

TEST_F(BlobDataHandleTest, CreateFromFile) {
  String kPath = "path";
  uint64_t kOffset = 0;
  uint64_t kSize = 1234;
  base::Time kModificationTime = base::Time();
  String kType = "content/type";

  FakeFileBackedBlobFactory file_factory;
  mojo::Remote<FileBackedBlobFactory> file_factory_remote;
  mojo::Receiver<FileBackedBlobFactory> file_factory_receiver(
      &file_factory, file_factory_remote.BindNewPipeAndPassReceiver());

  scoped_refptr<BlobDataHandle> handle =
      BlobDataHandle::CreateForFile(file_factory_remote.get(), kPath, kOffset,
                                    kSize, kModificationTime, kType);

  EXPECT_EQ(kType, handle->GetType());
  EXPECT_EQ(kSize, handle->size());
  EXPECT_FALSE(handle->IsSingleUnknownSizeFile());

  file_factory_remote.FlushForTesting();
  EXPECT_EQ(1u, file_factory.registrations.size());
  const auto& reg = file_factory.registrations[0];
  EXPECT_EQ(handle->Uuid(), reg.uuid);
  EXPECT_EQ(kType, reg.content_type);
  EXPECT_EQ(WebStringToFilePath(kPath), reg.file->path);
  EXPECT_EQ(kSize, reg.file->length);
  EXPECT_EQ(kOffset, reg.file->offset);
  EXPECT_EQ(kModificationTime, reg.file->expected_modification_time);
}

TEST_F(BlobDataHandleTest, CreateFromEmptyElements) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes({});
  data->AppendBlob(empty_blob_, 0, 0);

  TestCreateBlob(std::move(data), {});
}

TEST_F(BlobDataHandleTest, CreateFromSmallBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(small_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(ExpectedElement::EmbeddedBytes(small_test_data_));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromLargeBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(large_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(ExpectedElement::LargeBytes(large_test_data_));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromMergedBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(medium_test_data_);
  data->AppendBytes(small_test_data_);
  EXPECT_EQ(1u, data->ElementsForTesting().size());

  Vector<uint8_t> expected_data = medium_test_data_;
  expected_data.AppendVector(small_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(
      ExpectedElement::EmbeddedBytes(std::move(expected_data)));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromMergedLargeAndSmallBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(large_test_data_);
  data->AppendBytes(small_test_data_);
  EXPECT_EQ(1u, data->ElementsForTesting().size());

  Vector<uint8_t> expected_data = large_test_data_;
  expected_data.AppendVector(small_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(
      ExpectedElement::LargeBytes(std::move(expected_data)));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromMergedSmallAndLargeBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(small_test_data_);
  data->AppendBytes(large_test_data_);
  EXPECT_EQ(1u, data->ElementsForTesting().size());

  Vector<uint8_t> expected_data = small_test_data_;
  expected_data.AppendVector(large_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(
      ExpectedElement::LargeBytes(std::move(expected_data)));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromBlob) {
  auto data = std::make_unique<BlobData>();
  data->AppendBlob(test_blob_, 13, 765);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 13, 765));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromBlobsAndBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBlob(test_blob_, 10, 10);
  data->AppendBytes(medium_test_data_);
  data->AppendBlob(test_blob_, 0, 0);
  data->AppendBytes(small_test_data_);
  data->AppendBlob(test_blob_, 0, 10);
  data->AppendBytes(large_test_data_);

  Vector<uint8_t> expected_data = medium_test_data_;
  expected_data.AppendVector(small_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 10, 10));
  expected_elements.push_back(
      ExpectedElement::EmbeddedBytes(std::move(expected_data)));
  expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 0, 10));
  expected_elements.push_back(ExpectedElement::LargeBytes(large_test_data_));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromSmallBytesAfterLargeBytes) {
  auto data = std::make_unique<BlobData>();
  data->AppendBytes(large_test_data_);
  data->AppendBlob(test_blob_, 0, 10);
  data->AppendBytes(small_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(ExpectedElement::LargeBytes(large_test_data_));
  expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 0, 10));
  expected_elements.push_back(ExpectedElement::EmbeddedBytes(small_test_data_));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

TEST_F(BlobDataHandleTest, CreateFromManyMergedBytes) {
  auto data = std::make_unique<BlobData>();
  Vector<uint8_t> merged_data;
  while (merged_data.size() <= DataElementBytes::kMaximumEmbeddedDataSize) {
    data->AppendBytes(medium_test_data_);
    merged_data.AppendVector(medium_test_data_);
  }
  data->AppendBlob(test_blob_, 0, 10);
  data->AppendBytes(medium_test_data_);

  Vector<ExpectedElement> expected_elements;
  expected_elements.push_back(
      ExpectedElement::LargeBytes(std::move(merged_data)));
  expected_elements.push_back(ExpectedElement::Blob(test_blob_uuid_, 0, 10));
  expected_elements.push_back(
      ExpectedElement::EmbeddedBytes(medium_test_data_));

  TestCreateBlob(std::move(data), std::move(expected_elements));
}

}  // namespace blink