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

#include "content/public/test/test_file_system_backend.h"

#include <set>
#include <string>
#include <vector>

#include "base/files/file.h"
#include "base/files/file_util.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/sequenced_task_runner.h"
#include "base/thread_task_runner_handle.h"
#include "storage/browser/fileapi/copy_or_move_file_validator.h"
#include "storage/browser/fileapi/file_observers.h"
#include "storage/browser/fileapi/file_stream_reader.h"
#include "storage/browser/fileapi/file_system_operation.h"
#include "storage/browser/fileapi/file_system_operation_context.h"
#include "storage/browser/fileapi/file_system_quota_util.h"
#include "storage/browser/fileapi/local_file_util.h"
#include "storage/browser/fileapi/native_file_util.h"
#include "storage/browser/fileapi/quota/quota_reservation.h"
#include "storage/browser/fileapi/sandbox_file_stream_writer.h"
#include "storage/browser/quota/quota_manager.h"
#include "storage/common/fileapi/file_system_util.h"

using storage::FileSystemContext;
using storage::FileSystemOperation;
using storage::FileSystemOperationContext;
using storage::FileSystemURL;

namespace content {

namespace {

// Stub implementation of storage::LocalFileUtil.
class TestFileUtil : public storage::LocalFileUtil {
 public:
  explicit TestFileUtil(const base::FilePath& base_path)
      : base_path_(base_path) {}
  ~TestFileUtil() override {}

  // LocalFileUtil overrides.
  base::File::Error GetLocalFilePath(FileSystemOperationContext* context,
                                     const FileSystemURL& file_system_url,
                                     base::FilePath* local_file_path) override {
    *local_file_path = base_path_.Append(file_system_url.path());
    return base::File::FILE_OK;
  }

 private:
  base::FilePath base_path_;
};

}  // namespace

// This only supports single origin.
class TestFileSystemBackend::QuotaUtil : public storage::FileSystemQuotaUtil,
                                         public storage::FileUpdateObserver {
 public:
  QuotaUtil() : usage_(0) {}
  ~QuotaUtil() override {}

  // FileSystemQuotaUtil overrides.
  base::File::Error DeleteOriginDataOnFileTaskRunner(
      FileSystemContext* context,
      storage::QuotaManagerProxy* proxy,
      const GURL& origin_url,
      storage::FileSystemType type) override {
    NOTREACHED();
    return base::File::FILE_OK;
  }

  scoped_refptr<storage::QuotaReservation>
  CreateQuotaReservationOnFileTaskRunner(
      const GURL& origin_url,
      storage::FileSystemType type) override {
    NOTREACHED();
    return scoped_refptr<storage::QuotaReservation>();
  }

  void GetOriginsForTypeOnFileTaskRunner(storage::FileSystemType type,
                                         std::set<GURL>* origins) override {
    NOTREACHED();
  }

  void GetOriginsForHostOnFileTaskRunner(storage::FileSystemType type,
                                         const std::string& host,
                                         std::set<GURL>* origins) override {
    NOTREACHED();
  }

  int64 GetOriginUsageOnFileTaskRunner(FileSystemContext* context,
                                       const GURL& origin_url,
                                       storage::FileSystemType type) override {
    return usage_;
  }

  // FileUpdateObserver overrides.
  void OnStartUpdate(const FileSystemURL& url) override {}
  void OnUpdate(const FileSystemURL& url, int64 delta) override {
    usage_ += delta;
  }
  void OnEndUpdate(const FileSystemURL& url) override {}

 private:
  int64 usage_;
  DISALLOW_COPY_AND_ASSIGN(QuotaUtil);
};

TestFileSystemBackend::TestFileSystemBackend(
    base::SequencedTaskRunner* task_runner,
    const base::FilePath& base_path)
    : base_path_(base_path),
      task_runner_(task_runner),
      file_util_(
          new storage::AsyncFileUtilAdapter(new TestFileUtil(base_path))),
      quota_util_(new QuotaUtil),
      require_copy_or_move_validator_(false) {
  update_observers_ =
      update_observers_.AddObserver(quota_util_.get(), task_runner_.get());
}

TestFileSystemBackend::~TestFileSystemBackend() {
}

bool TestFileSystemBackend::CanHandleType(storage::FileSystemType type) const {
  return (type == storage::kFileSystemTypeTest);
}

void TestFileSystemBackend::Initialize(FileSystemContext* context) {
}

void TestFileSystemBackend::ResolveURL(const FileSystemURL& url,
                                       storage::OpenFileSystemMode mode,
                                       const OpenFileSystemCallback& callback) {
  callback.Run(GetFileSystemRootURI(url.origin(), url.type()),
               GetFileSystemName(url.origin(), url.type()),
               base::File::FILE_OK);
}

storage::AsyncFileUtil* TestFileSystemBackend::GetAsyncFileUtil(
    storage::FileSystemType type) {
  return file_util_.get();
}

storage::WatcherManager* TestFileSystemBackend::GetWatcherManager(
    storage::FileSystemType type) {
  return nullptr;
}

storage::CopyOrMoveFileValidatorFactory*
TestFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
    storage::FileSystemType type,
    base::File::Error* error_code) {
  DCHECK(error_code);
  *error_code = base::File::FILE_OK;
  if (require_copy_or_move_validator_) {
    if (!copy_or_move_file_validator_factory_)
      *error_code = base::File::FILE_ERROR_SECURITY;
    return copy_or_move_file_validator_factory_.get();
  }
  return nullptr;
}

void TestFileSystemBackend::InitializeCopyOrMoveFileValidatorFactory(
    scoped_ptr<storage::CopyOrMoveFileValidatorFactory> factory) {
  if (!copy_or_move_file_validator_factory_)
    copy_or_move_file_validator_factory_ = factory.Pass();
}

FileSystemOperation* TestFileSystemBackend::CreateFileSystemOperation(
    const FileSystemURL& url,
    FileSystemContext* context,
    base::File::Error* error_code) const {
  scoped_ptr<FileSystemOperationContext> operation_context(
      new FileSystemOperationContext(context));
  operation_context->set_update_observers(*GetUpdateObservers(url.type()));
  operation_context->set_change_observers(*GetChangeObservers(url.type()));
  return FileSystemOperation::Create(url, context, operation_context.Pass());
}

bool TestFileSystemBackend::SupportsStreaming(
    const storage::FileSystemURL& url) const {
  return false;
}

bool TestFileSystemBackend::HasInplaceCopyImplementation(
    storage::FileSystemType type) const {
  return true;
}

scoped_ptr<storage::FileStreamReader>
TestFileSystemBackend::CreateFileStreamReader(
    const FileSystemURL& url,
    int64 offset,
    int64 max_bytes_to_read,
    const base::Time& expected_modification_time,
    FileSystemContext* context) const {
  return scoped_ptr<storage::FileStreamReader>(
      storage::FileStreamReader::CreateForFileSystemFile(
          context, url, offset, expected_modification_time));
}

scoped_ptr<storage::FileStreamWriter>
TestFileSystemBackend::CreateFileStreamWriter(
    const FileSystemURL& url,
    int64 offset,
    FileSystemContext* context) const {
  return scoped_ptr<storage::FileStreamWriter>(
      new storage::SandboxFileStreamWriter(
          context, url, offset, *GetUpdateObservers(url.type())));
}

storage::FileSystemQuotaUtil* TestFileSystemBackend::GetQuotaUtil() {
  return quota_util_.get();
}

const storage::UpdateObserverList* TestFileSystemBackend::GetUpdateObservers(
    storage::FileSystemType type) const {
  return &update_observers_;
}

const storage::ChangeObserverList* TestFileSystemBackend::GetChangeObservers(
    storage::FileSystemType type) const {
  return &change_observers_;
}

const storage::AccessObserverList* TestFileSystemBackend::GetAccessObservers(
    storage::FileSystemType type) const {
  return nullptr;
}

void TestFileSystemBackend::AddFileChangeObserver(
    storage::FileChangeObserver* observer) {
  change_observers_ =
      change_observers_.AddObserver(observer, task_runner_.get());
}

}  // namespace content