// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "chrome/browser/sync_file_system/local/canned_syncable_file_system.h"

#include <stddef.h>

#include <algorithm>
#include <iterator>
#include <utility>

#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback_helpers.h"
#include "base/memory/scoped_refptr.h"
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "base/task/thread_pool/thread_pool_instance.h"
#include "base/uuid.h"
#include "chrome/browser/sync_file_system/file_change.h"
#include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
#include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
#include "chrome/browser/sync_file_system/local/sync_file_system_backend.h"
#include "chrome/browser/sync_file_system/syncable_file_system_util.h"
#include "storage/browser/blob/blob_storage_context.h"
#include "storage/browser/blob/shareable_file_reference.h"
#include "storage/browser/file_system/copy_or_move_hook_delegate.h"
#include "storage/browser/file_system/external_mount_points.h"
#include "storage/browser/file_system/file_system_backend.h"
#include "storage/browser/file_system/file_system_context.h"
#include "storage/browser/file_system/file_system_operation_context.h"
#include "storage/browser/file_system/file_system_operation_runner.h"
#include "storage/browser/quota/quota_manager.h"
#include "storage/browser/quota/quota_manager_proxy.h"
#include "storage/browser/test/mock_blob_util.h"
#include "storage/browser/test/mock_quota_manager.h"
#include "storage/browser/test/mock_special_storage_policy.h"
#include "storage/browser/test/test_file_system_options.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/blink/public/common/storage_key/storage_key.h"
#include "url/gurl.h"
#include "url/origin.h"

using base::File;
using storage::FileSystemContext;
using storage::FileSystemOperationRunner;
using storage::FileSystemURL;
using storage::FileSystemURLSet;
using storage::QuotaManager;
using storage::ScopedTextBlob;

namespace sync_file_system {

namespace {

template <typename R>
void AssignAndQuit(base::TaskRunner* original_task_runner,
                   base::OnceClosure quit_closure,
                   R* result_out,
                   R result) {
  DCHECK(result_out);
  *result_out = std::forward<R>(result);
  original_task_runner->PostTask(FROM_HERE, std::move(quit_closure));
}

template <typename R, typename CallbackType>
R RunOnThread(base::SingleThreadTaskRunner* task_runner,
              const base::Location& location,
              base::OnceCallback<void(CallbackType callback)> task) {
  R result;
  base::RunLoop run_loop;
  task_runner->PostTask(
      location,
      base::BindOnce(std::move(task),
                     base::BindRepeating(
                         &AssignAndQuit<R>,
                         base::RetainedRef(
                             base::SingleThreadTaskRunner::GetCurrentDefault()),
                         run_loop.QuitClosure(), base::Unretained(&result))));
  run_loop.Run();
  return result;
}

void RunOnThread(base::SingleThreadTaskRunner* task_runner,
                 const base::Location& location,
                 base::OnceClosure task) {
  base::RunLoop run_loop;
  task_runner->PostTaskAndReply(
      location, std::move(task),
      base::BindOnce(
          base::IgnoreResult(&base::SingleThreadTaskRunner::PostTask),
          base::SingleThreadTaskRunner::GetCurrentDefault(), FROM_HERE,
          run_loop.QuitClosure()));
  run_loop.Run();
}

void EnsureRunningOn(base::SingleThreadTaskRunner* runner) {
  EXPECT_TRUE(runner->RunsTasksInCurrentSequence());
}

void VerifySameTaskRunner(
    base::SingleThreadTaskRunner* runner1,
    base::SingleThreadTaskRunner* runner2) {
  ASSERT_TRUE(runner1 != nullptr);
  ASSERT_TRUE(runner2 != nullptr);
  runner1->PostTask(
      FROM_HERE, base::BindOnce(&EnsureRunningOn, base::RetainedRef(runner2)));
}

void OnCreateSnapshotFileAndVerifyData(
    const std::string& expected_data,
    CannedSyncableFileSystem::StatusCallback callback,
    base::File::Error result,
    const base::File::Info& file_info,
    const base::FilePath& platform_path,
    scoped_refptr<storage::ShareableFileReference> /* file_ref */) {
  if (result != base::File::FILE_OK) {
    std::move(callback).Run(result);
    return;
  }
  EXPECT_EQ(expected_data.size(), static_cast<size_t>(file_info.size));
  std::string data;
  const bool read_status = base::ReadFileToString(platform_path, &data);
  EXPECT_TRUE(read_status);
  EXPECT_EQ(expected_data, data);
  std::move(callback).Run(result);
}

void OnCreateSnapshotFile(
    base::File::Info* file_info_out,
    base::FilePath* platform_path_out,
    CannedSyncableFileSystem::StatusCallback callback,
    base::File::Error result,
    const base::File::Info& file_info,
    const base::FilePath& platform_path,
    scoped_refptr<storage::ShareableFileReference> file_ref) {
  DCHECK(!file_ref.get());
  DCHECK(file_info_out);
  DCHECK(platform_path_out);
  *file_info_out = file_info;
  *platform_path_out = platform_path;
  std::move(callback).Run(result);
}

class DirectoryHelper {
 public:
  explicit DirectoryHelper(CannedSyncableFileSystem::StatusCallback callback)
      : callback_(std::move(callback)) {}

  void OnReadDirectory(CannedSyncableFileSystem::FileEntryList* entries_out,
                       base::File::Error error,
                       storage::FileSystemOperation::FileEntryList entries,
                       bool has_more) {
    DCHECK(entries_out);
    entries_out->reserve(entries_out->size() + entries.size());
    std::ranges::copy(entries, std::back_inserter(*entries_out));

    if (!has_more)
      std::move(callback_).Run(error);
  }

 private:
  CannedSyncableFileSystem::StatusCallback callback_;
};

class WriteHelper {
 public:
  WriteHelper() : bytes_written_(0) {}
  WriteHelper(std::unique_ptr<storage::BlobStorageContext> blob_storage_context,
              const std::string& blob_data)
      : bytes_written_(0),
        blob_storage_context_(std::move(blob_storage_context)),
        blob_data_(new ScopedTextBlob(
            blob_storage_context_.get(),
            base::Uuid::GenerateRandomV4().AsLowercaseString(),
            blob_data)) {}

  WriteHelper(const WriteHelper&) = delete;
  WriteHelper& operator=(const WriteHelper&) = delete;

  ~WriteHelper() = default;

  ScopedTextBlob* scoped_text_blob() const { return blob_data_.get(); }

  void DidWrite(base::OnceCallback<void(int64_t result)> completion_callback,
                File::Error error,
                int64_t bytes,
                bool complete) {
    if (error == base::File::FILE_OK) {
      bytes_written_ += bytes;
      if (!complete)
        return;
    }
    std::move(completion_callback)
        .Run(error == base::File::FILE_OK ? bytes_written_
                                          : static_cast<int64_t>(error));
  }

 private:
  int64_t bytes_written_;
  std::unique_ptr<storage::BlobStorageContext> blob_storage_context_;
  std::unique_ptr<ScopedTextBlob> blob_data_;
};

void DidGetUsageAndQuota(storage::StatusCallback callback,
                         int64_t* usage_out,
                         int64_t* quota_out,
                         blink::mojom::QuotaStatusCode status,
                         int64_t usage,
                         int64_t quota) {
  *usage_out = usage;
  *quota_out = quota;
  std::move(callback).Run(status);
}

void EnsureLastTaskRuns(base::SingleThreadTaskRunner* runner) {
  base::RunLoop run_loop;
  runner->PostTaskAndReply(FROM_HERE, base::DoNothing(),
                           run_loop.QuitClosure());
  run_loop.Run();
}

}  // namespace

CannedSyncableFileSystem::CannedSyncableFileSystem(
    const GURL& origin,
    bool in_memory_file_system,
    const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner,
    const scoped_refptr<base::SingleThreadTaskRunner>& file_task_runner)
    : origin_(origin),
      type_(storage::kFileSystemTypeSyncable),
      result_(base::File::FILE_OK),
      sync_status_(sync_file_system::SYNC_STATUS_OK),
      in_memory_file_system_(in_memory_file_system),
      io_task_runner_(io_task_runner),
      file_task_runner_(file_task_runner),
      is_filesystem_set_up_(false),
      is_filesystem_opened_(false),
      sync_status_observers_(new ObserverList) {}

CannedSyncableFileSystem::~CannedSyncableFileSystem() = default;

void CannedSyncableFileSystem::SetUp() {
  ASSERT_FALSE(is_filesystem_set_up_);
  ASSERT_TRUE(data_dir_.CreateUniqueTempDir());

  auto storage_policy =
      base::MakeRefCounted<storage::MockSpecialStoragePolicy>();

  quota_manager_ = base::MakeRefCounted<storage::MockQuotaManager>(
      /*is_incognito=*/false, data_dir_.GetPath(), io_task_runner_.get(),
      storage_policy.get());
  quota_manager_proxy_ = base::MakeRefCounted<storage::MockQuotaManagerProxy>(
      quota_manager_.get(), io_task_runner_.get());

  std::vector<std::string> additional_allowed_schemes;
  additional_allowed_schemes.push_back(origin_.GetScheme());
  storage::FileSystemOptions options(
      storage::FileSystemOptions::PROFILE_MODE_NORMAL, in_memory_file_system_,
      additional_allowed_schemes);

  std::vector<std::unique_ptr<storage::FileSystemBackend>> additional_backends;
  additional_backends.push_back(SyncFileSystemBackend::CreateForTesting());

  file_system_context_ = FileSystemContext::Create(
      io_task_runner_, file_task_runner_,
      storage::ExternalMountPoints::CreateRefCounted(),
      std::move(storage_policy), quota_manager_proxy_.get(),
      std::move(additional_backends),
      std::vector<storage::URLRequestAutoMountHandler>(), data_dir_.GetPath(),
      options);

  is_filesystem_set_up_ = true;
}

void CannedSyncableFileSystem::TearDown() {
  file_system_context_ = nullptr;

  // Make sure we give some more time to finish tasks on other threads.
  EnsureLastTaskRuns(io_task_runner_.get());
  EnsureLastTaskRuns(file_task_runner_.get());
  base::ThreadPoolInstance::Get()->FlushForTesting();

  // `quota_manager_` might be used by pending tasks, so wait to destroy this
  // until after we've ensured all tasks have finished.
  quota_manager_ = nullptr;
}

FileSystemURL CannedSyncableFileSystem::URL(const std::string& path) const {
  EXPECT_TRUE(is_filesystem_set_up_);
  EXPECT_FALSE(root_url_.is_empty());

  GURL url(root_url_.spec() + path);
  return file_system_context_->CrackURLInFirstPartyContext(url);
}

File::Error CannedSyncableFileSystem::OpenFileSystem() {
  EXPECT_TRUE(is_filesystem_set_up_);

  base::RunLoop run_loop;
  io_task_runner_->PostTask(
      FROM_HERE,
      base::BindOnce(
          &CannedSyncableFileSystem::DoOpenFileSystem, base::Unretained(this),
          base::BindOnce(&CannedSyncableFileSystem::DidOpenFileSystem,
                         base::Unretained(this),
                         base::RetainedRef(
                             base::SingleThreadTaskRunner::GetCurrentDefault()),
                         run_loop.QuitClosure())));
  run_loop.Run();

  if (backend()->sync_context()) {
    // Register 'this' as a sync status observer.
    RunOnThread(
        io_task_runner_.get(), FROM_HERE,
        base::BindOnce(&CannedSyncableFileSystem::InitializeSyncStatusObserver,
                       base::Unretained(this)));
  }
  return result_;
}

void CannedSyncableFileSystem::AddSyncStatusObserver(
    LocalFileSyncStatus::Observer* observer) {
  sync_status_observers_->AddObserver(observer);
}

void CannedSyncableFileSystem::RemoveSyncStatusObserver(
    LocalFileSyncStatus::Observer* observer) {
  sync_status_observers_->RemoveObserver(observer);
}

SyncStatusCode CannedSyncableFileSystem::MaybeInitializeFileSystemContext(
    LocalFileSyncContext* sync_context) {
  DCHECK(sync_context);
  base::RunLoop run_loop;
  sync_status_ = sync_file_system::SYNC_STATUS_UNKNOWN;
  VerifySameTaskRunner(io_task_runner_.get(),
                       sync_context->io_task_runner_.get());
  sync_context->MaybeInitializeFileSystemContext(
      origin_, file_system_context_.get(),
      base::BindOnce(&CannedSyncableFileSystem::DidInitializeFileSystemContext,
                     base::Unretained(this), run_loop.QuitClosure()));
  run_loop.Run();
  return sync_status_;
}

File::Error CannedSyncableFileSystem::CreateDirectory(
    const FileSystemURL& url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoCreateDirectory,
                     base::Unretained(this), url));
}

File::Error CannedSyncableFileSystem::CreateFile(const FileSystemURL& url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoCreateFile,
                     base::Unretained(this), url));
}

File::Error CannedSyncableFileSystem::Copy(
    const FileSystemURL& src_url, const FileSystemURL& dest_url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoCopy, base::Unretained(this),
                     src_url, dest_url));
}

File::Error CannedSyncableFileSystem::Move(
    const FileSystemURL& src_url, const FileSystemURL& dest_url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoMove, base::Unretained(this),
                     src_url, dest_url));
}

File::Error CannedSyncableFileSystem::TruncateFile(const FileSystemURL& url,
                                                   int64_t size) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoTruncateFile,
                     base::Unretained(this), url, size));
}

File::Error CannedSyncableFileSystem::TouchFile(
    const FileSystemURL& url,
    const base::Time& last_access_time,
    const base::Time& last_modified_time) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoTouchFile,
                     base::Unretained(this), url, last_access_time,
                     last_modified_time));
}

File::Error CannedSyncableFileSystem::Remove(
    const FileSystemURL& url, bool recursive) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoRemove,
                     base::Unretained(this), url, recursive));
}

File::Error CannedSyncableFileSystem::FileExists(
    const FileSystemURL& url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoFileExists,
                     base::Unretained(this), url));
}

File::Error CannedSyncableFileSystem::DirectoryExists(
    const FileSystemURL& url) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoDirectoryExists,
                     base::Unretained(this), url));
}

File::Error CannedSyncableFileSystem::VerifyFile(
    const FileSystemURL& url,
    const std::string& expected_data) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoVerifyFile,
                     base::Unretained(this), url, expected_data));
}

File::Error CannedSyncableFileSystem::GetMetadataAndPlatformPath(
    const FileSystemURL& url,
    base::File::Info* info,
    base::FilePath* platform_path) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoGetMetadataAndPlatformPath,
                     base::Unretained(this), url, info, platform_path));
}

File::Error CannedSyncableFileSystem::ReadDirectory(
    const storage::FileSystemURL& url,
    FileEntryList* entries) {
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoReadDirectory,
                     base::Unretained(this), url, entries));
}

int64_t CannedSyncableFileSystem::Write(
    const FileSystemURL& url,
    std::unique_ptr<storage::BlobDataHandle> blob_data_handle) {
  return RunOnThread<int64_t>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoWrite, base::Unretained(this),
                     url, std::move(blob_data_handle)));
}

int64_t CannedSyncableFileSystem::WriteString(const FileSystemURL& url,
                                              const std::string& data) {
  return RunOnThread<int64_t>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoWriteString,
                     base::Unretained(this), url, data));
}

File::Error CannedSyncableFileSystem::DeleteFileSystem() {
  EXPECT_TRUE(is_filesystem_set_up_);
  return RunOnThread<File::Error>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(
          &FileSystemContext::DeleteFileSystem, file_system_context_,
          blink::StorageKey::CreateFirstParty(url::Origin::Create(origin_)),
          type_));
}

blink::mojom::QuotaStatusCode CannedSyncableFileSystem::GetUsageAndQuota(
    int64_t* usage,
    int64_t* quota) {
  return RunOnThread<blink::mojom::QuotaStatusCode>(
      io_task_runner_.get(), FROM_HERE,
      base::BindOnce(&CannedSyncableFileSystem::DoGetUsageAndQuota,
                     base::Unretained(this), usage, quota));
}

void CannedSyncableFileSystem::GetChangedURLsInTracker(
    FileSystemURLSet* urls) {
  RunOnThread(
      file_task_runner_.get(), FROM_HERE,
      base::BindOnce(&LocalFileChangeTracker::GetAllChangedURLs,
                     base::Unretained(backend()->change_tracker()), urls));
}

void CannedSyncableFileSystem::ClearChangeForURLInTracker(
    const FileSystemURL& url) {
  RunOnThread(
      file_task_runner_.get(), FROM_HERE,
      base::BindOnce(&LocalFileChangeTracker::ClearChangesForURL,
                     base::Unretained(backend()->change_tracker()), url));
}

void CannedSyncableFileSystem::GetChangesForURLInTracker(
    const FileSystemURL& url,
    FileChangeList* changes) {
  RunOnThread(file_task_runner_.get(), FROM_HERE,
              base::BindOnce(&LocalFileChangeTracker::GetChangesForURL,
                             base::Unretained(backend()->change_tracker()), url,
                             changes));
}

SyncFileSystemBackend* CannedSyncableFileSystem::backend() {
  return SyncFileSystemBackend::GetBackend(file_system_context_.get());
}

FileSystemOperationRunner* CannedSyncableFileSystem::operation_runner() {
  return file_system_context_->operation_runner();
}

void CannedSyncableFileSystem::OnSyncEnabled(const FileSystemURL& url) {
  sync_status_observers_->Notify(
      FROM_HERE, &LocalFileSyncStatus::Observer::OnSyncEnabled, url);
}

void CannedSyncableFileSystem::OnWriteEnabled(const FileSystemURL& url) {
  sync_status_observers_->Notify(
      FROM_HERE, &LocalFileSyncStatus::Observer::OnWriteEnabled, url);
}

void CannedSyncableFileSystem::DoOpenFileSystem(
    OpenFileSystemCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_FALSE(is_filesystem_opened_);
  file_system_context_->OpenFileSystem(
      blink::StorageKey::CreateFirstParty(url::Origin::Create(origin_)),
      /*bucket=*/std::nullopt, type_,
      storage::OPEN_FILE_SYSTEM_CREATE_IF_NONEXISTENT, std::move(callback));
}

void CannedSyncableFileSystem::DoCreateDirectory(const FileSystemURL& url,
                                                 StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->CreateDirectory(
      url, false /* exclusive */, false /* recursive */, std::move(callback));
}

void CannedSyncableFileSystem::DoCreateFile(const FileSystemURL& url,
                                            StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->CreateFile(url, false /* exclusive */,
                                 std::move(callback));
}

void CannedSyncableFileSystem::DoCopy(const FileSystemURL& src_url,
                                      const FileSystemURL& dest_url,
                                      StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->Copy(
      src_url, dest_url, storage::FileSystemOperation::CopyOrMoveOptionSet(),
      storage::FileSystemOperation::ERROR_BEHAVIOR_ABORT,
      std::make_unique<storage::CopyOrMoveHookDelegate>(), std::move(callback));
}

void CannedSyncableFileSystem::DoMove(const FileSystemURL& src_url,
                                      const FileSystemURL& dest_url,
                                      StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->Move(
      src_url, dest_url, storage::FileSystemOperation::CopyOrMoveOptionSet(),
      storage::FileSystemOperation::ERROR_BEHAVIOR_ABORT,
      std::make_unique<storage::CopyOrMoveHookDelegate>(), std::move(callback));
}

void CannedSyncableFileSystem::DoTruncateFile(const FileSystemURL& url,
                                              int64_t size,
                                              StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->Truncate(url, size, std::move(callback));
}

void CannedSyncableFileSystem::DoTouchFile(const FileSystemURL& url,
                                           const base::Time& last_access_time,
                                           const base::Time& last_modified_time,
                                           StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->TouchFile(url, last_access_time, last_modified_time,
                                std::move(callback));
}

void CannedSyncableFileSystem::DoRemove(const FileSystemURL& url,
                                        bool recursive,
                                        StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->Remove(url, recursive, std::move(callback));
}

void CannedSyncableFileSystem::DoFileExists(const FileSystemURL& url,
                                            StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->FileExists(url, std::move(callback));
}

void CannedSyncableFileSystem::DoDirectoryExists(const FileSystemURL& url,
                                                 StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->DirectoryExists(url, std::move(callback));
}

void CannedSyncableFileSystem::DoVerifyFile(const FileSystemURL& url,
                                            const std::string& expected_data,
                                            StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->CreateSnapshotFile(
      url, base::BindOnce(&OnCreateSnapshotFileAndVerifyData, expected_data,
                          std::move(callback)));
}

void CannedSyncableFileSystem::DoGetMetadataAndPlatformPath(
    const FileSystemURL& url,
    base::File::Info* info,
    base::FilePath* platform_path,
    StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  operation_runner()->CreateSnapshotFile(
      url, base::BindOnce(&OnCreateSnapshotFile, info, platform_path,
                          std::move(callback)));
}

void CannedSyncableFileSystem::DoReadDirectory(const FileSystemURL& url,
                                               FileEntryList* entries,
                                               StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);

  auto directory_helper =
      std::make_unique<DirectoryHelper>(std::move(callback));

  operation_runner()->ReadDirectory(
      url, base::BindRepeating(&DirectoryHelper::OnReadDirectory,
                               std::move(directory_helper), entries));
}

void CannedSyncableFileSystem::DoWrite(
    const FileSystemURL& url,
    std::unique_ptr<storage::BlobDataHandle> blob_data_handle,
    WriteCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  WriteHelper* helper = new WriteHelper;
  operation_runner()->Write(
      url, std::move(blob_data_handle), 0,
      base::BindRepeating(&WriteHelper::DidWrite, base::Owned(helper),
                          std::move(callback)));
}

void CannedSyncableFileSystem::DoWriteString(const FileSystemURL& url,
                                             const std::string& data,
                                             WriteCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  auto blob_storage_context = std::make_unique<storage::BlobStorageContext>();
  WriteHelper* helper = new WriteHelper(std::move(blob_storage_context), data);
  operation_runner()->Write(
      url, helper->scoped_text_blob()->GetBlobDataHandle(), 0,
      base::BindRepeating(&WriteHelper::DidWrite, base::Owned(helper),
                          std::move(callback)));
}

void CannedSyncableFileSystem::DoGetUsageAndQuota(
    int64_t* usage,
    int64_t* quota,
    storage::StatusCallback callback) {
  EXPECT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  EXPECT_TRUE(is_filesystem_opened_);
  DCHECK(quota_manager_.get());
  quota_manager_->GetUsageAndQuota(
      blink::StorageKey::CreateFirstParty(url::Origin::Create(origin_)),
      base::BindOnce(&DidGetUsageAndQuota, std::move(callback), usage, quota));
}

void CannedSyncableFileSystem::DidOpenFileSystem(
    base::SingleThreadTaskRunner* original_task_runner,
    base::OnceClosure quit_closure,
    const storage::FileSystemURL& root,
    const std::string& name,
    File::Error result) {
  if (io_task_runner_->RunsTasksInCurrentSequence()) {
    EXPECT_FALSE(is_filesystem_opened_);
    is_filesystem_opened_ = true;
  }
  if (!original_task_runner->RunsTasksInCurrentSequence()) {
    DCHECK(io_task_runner_->RunsTasksInCurrentSequence());
    original_task_runner->PostTask(
        FROM_HERE, base::BindOnce(&CannedSyncableFileSystem::DidOpenFileSystem,
                                  base::Unretained(this),
                                  base::RetainedRef(original_task_runner),
                                  std::move(quit_closure), root, name, result));
    return;
  }
  result_ = result;
  root_url_ = GetSyncableFileSystemRootURI(root.origin().GetURL());
  std::move(quit_closure).Run();
}

void CannedSyncableFileSystem::DidInitializeFileSystemContext(
    base::OnceClosure quit_closure,
    SyncStatusCode status) {
  sync_status_ = status;
  std::move(quit_closure).Run();
}

void CannedSyncableFileSystem::InitializeSyncStatusObserver() {
  ASSERT_TRUE(io_task_runner_->RunsTasksInCurrentSequence());
  backend()->sync_context()->sync_status()->AddObserver(this);
}

}  // namespace sync_file_system