// Copyright (c) 2012 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.

#ifndef CHROME_BROWSER_DRIVE_FAKE_DRIVE_SERVICE_H_
#define CHROME_BROWSER_DRIVE_FAKE_DRIVE_SERVICE_H_

#include <string>

#include "base/files/file_path.h"
#include "base/threading/thread_checker.h"
#include "chrome/browser/drive/drive_service_interface.h"

namespace base {
class DictionaryValue;
}

namespace google_apis {
class AboutResource;
class ChangeResource;
class FileResource;
}

namespace drive {

// This class implements a fake DriveService which acts like a real Drive
// service. The fake service works as follows:
//
// 1) Load JSON files and construct the in-memory resource list.
// 2) Return valid responses based on the the in-memory resource list.
// 3) Update the in-memory resource list by requests like DeleteResource().
class FakeDriveService : public DriveServiceInterface {
 public:
  class ChangeObserver {
   public:
    virtual ~ChangeObserver() {}
    virtual void OnNewChangeAvailable() = 0;
  };

  FakeDriveService();
  ~FakeDriveService() override;

  // Loads the app list for Drive API. Returns true on success.
  bool LoadAppListForDriveApi(const std::string& relative_path);

  // Adds an app to app list.
  void AddApp(const std::string& app_id,
              const std::string& app_name,
              const std::string& product_id,
              const std::string& create_url,
              bool is_removable);

  // Removes an app by product id.
  void RemoveAppByProductId(const std::string& product_id);

  // Returns true if the service knows the given drive app id.
  bool HasApp(const std::string& app_id) const;

  // Changes the offline state. All functions fail with DRIVE_NO_CONNECTION
  // when offline. By default the offline state is false.
  void set_offline(bool offline) { offline_ = offline; }

  // GetAllFileList never returns result when this is set to true.
  // Used to emulate the real server's slowness.
  void set_never_return_all_file_list(bool value) {
    never_return_all_file_list_ = value;
  }

  // Changes the default max results returned from GetAllFileList().
  // By default, it's set to 0, which is unlimited.
  void set_default_max_results(int default_max_results) {
    default_max_results_ = default_max_results;
  }

  // Sets the url to the test server to be used as a base for generated share
  // urls to the share dialog.
  void set_share_url_base(const GURL& share_url_base) {
    share_url_base_ = share_url_base;
  }

  // Changes the quota fields returned from GetAboutResource().
  void SetQuotaValue(int64 used, int64 total);

  // Returns the AboutResource.
  const google_apis::AboutResource& about_resource() const {
    return *about_resource_;
  }

  // Returns the number of times the file list is successfully loaded by
  // GetAllFileList().
  int file_list_load_count() const { return file_list_load_count_; }

  // Returns the number of times the resource list is successfully loaded by
  // GetChangeList().
  int change_list_load_count() const { return change_list_load_count_; }

  // Returns the number of times the resource list is successfully loaded by
  // GetFileListInDirectory().
  int directory_load_count() const { return directory_load_count_; }

  // Returns the number of times the about resource is successfully loaded
  // by GetAboutResource().
  int about_resource_load_count() const {
    return about_resource_load_count_;
  }

  // Returns the number of times the app list is successfully loaded by
  // GetAppList().
  int app_list_load_count() const { return app_list_load_count_; }

  // Returns the number of times GetAllFileList are blocked due to
  // set_never_return_all_file_list().
  int blocked_file_list_load_count() const {
    return blocked_file_list_load_count_;
  }

  // Returns the file path whose request is cancelled just before this method
  // invocation.
  const base::FilePath& last_cancelled_file() const {
    return last_cancelled_file_;
  }

  // Returns the (fake) URL for the link.
  static GURL GetFakeLinkUrl(const std::string& resource_id);

  // Sets the printf format for constructing the response of AuthorizeApp().
  // The format string must include two %s that are to be filled with
  // resource_id and app_id.
  void set_open_url_format(const std::string& url_format) {
    open_url_format_ = url_format;
  }

  // DriveServiceInterface Overrides
  void Initialize(const std::string& account_id) override;
  void AddObserver(DriveServiceObserver* observer) override;
  void RemoveObserver(DriveServiceObserver* observer) override;
  bool CanSendRequest() const override;
  std::string GetRootResourceId() const override;
  bool HasAccessToken() const override;
  void RequestAccessToken(
      const google_apis::AuthStatusCallback& callback) override;
  bool HasRefreshToken() const override;
  void ClearAccessToken() override;
  void ClearRefreshToken() override;
  google_apis::CancelCallback GetAllFileList(
      const google_apis::FileListCallback& callback) override;
  google_apis::CancelCallback GetFileListInDirectory(
      const std::string& directory_resource_id,
      const google_apis::FileListCallback& callback) override;
  // See the comment for EntryMatchWidthQuery() in .cc file for details about
  // the supported search query types.
  google_apis::CancelCallback Search(
      const std::string& search_query,
      const google_apis::FileListCallback& callback) override;
  google_apis::CancelCallback SearchByTitle(
      const std::string& title,
      const std::string& directory_resource_id,
      const google_apis::FileListCallback& callback) override;
  google_apis::CancelCallback GetChangeList(
      int64 start_changestamp,
      const google_apis::ChangeListCallback& callback) override;
  google_apis::CancelCallback GetRemainingChangeList(
      const GURL& next_link,
      const google_apis::ChangeListCallback& callback) override;
  google_apis::CancelCallback GetRemainingFileList(
      const GURL& next_link,
      const google_apis::FileListCallback& callback) override;
  google_apis::CancelCallback GetFileResource(
      const std::string& resource_id,
      const google_apis::FileResourceCallback& callback) override;
  google_apis::CancelCallback GetShareUrl(
      const std::string& resource_id,
      const GURL& embed_origin,
      const google_apis::GetShareUrlCallback& callback) override;
  google_apis::CancelCallback GetAboutResource(
      const google_apis::AboutResourceCallback& callback) override;
  google_apis::CancelCallback GetAppList(
      const google_apis::AppListCallback& callback) override;
  google_apis::CancelCallback DeleteResource(
      const std::string& resource_id,
      const std::string& etag,
      const google_apis::EntryActionCallback& callback) override;
  google_apis::CancelCallback TrashResource(
      const std::string& resource_id,
      const google_apis::EntryActionCallback& callback) override;
  google_apis::CancelCallback DownloadFile(
      const base::FilePath& local_cache_path,
      const std::string& resource_id,
      const google_apis::DownloadActionCallback& download_action_callback,
      const google_apis::GetContentCallback& get_content_callback,
      const google_apis::ProgressCallback& progress_callback) override;
  google_apis::CancelCallback CopyResource(
      const std::string& resource_id,
      const std::string& parent_resource_id,
      const std::string& new_title,
      const base::Time& last_modified,
      const google_apis::FileResourceCallback& callback) override;
  google_apis::CancelCallback UpdateResource(
      const std::string& resource_id,
      const std::string& parent_resource_id,
      const std::string& new_title,
      const base::Time& last_modified,
      const base::Time& last_viewed_by_me,
      const google_apis::drive::Properties& properties,
      const google_apis::FileResourceCallback& callback) override;
  google_apis::CancelCallback AddResourceToDirectory(
      const std::string& parent_resource_id,
      const std::string& resource_id,
      const google_apis::EntryActionCallback& callback) override;
  google_apis::CancelCallback RemoveResourceFromDirectory(
      const std::string& parent_resource_id,
      const std::string& resource_id,
      const google_apis::EntryActionCallback& callback) override;
  google_apis::CancelCallback AddNewDirectory(
      const std::string& parent_resource_id,
      const std::string& directory_title,
      const AddNewDirectoryOptions& options,
      const google_apis::FileResourceCallback& callback) override;
  google_apis::CancelCallback InitiateUploadNewFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& parent_resource_id,
      const std::string& title,
      const UploadNewFileOptions& options,
      const google_apis::InitiateUploadCallback& callback) override;
  google_apis::CancelCallback InitiateUploadExistingFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& resource_id,
      const UploadExistingFileOptions& options,
      const google_apis::InitiateUploadCallback& callback) override;
  google_apis::CancelCallback ResumeUpload(
      const GURL& upload_url,
      int64 start_position,
      int64 end_position,
      int64 content_length,
      const std::string& content_type,
      const base::FilePath& local_file_path,
      const google_apis::drive::UploadRangeCallback& callback,
      const google_apis::ProgressCallback& progress_callback) override;
  google_apis::CancelCallback GetUploadStatus(
      const GURL& upload_url,
      int64 content_length,
      const google_apis::drive::UploadRangeCallback& callback) override;
  google_apis::CancelCallback MultipartUploadNewFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& parent_resource_id,
      const std::string& title,
      const base::FilePath& local_file_path,
      const UploadNewFileOptions& options,
      const google_apis::FileResourceCallback& callback,
      const google_apis::ProgressCallback& progress_callback) override;
  google_apis::CancelCallback MultipartUploadExistingFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& resource_id,
      const base::FilePath& local_file_path,
      const UploadExistingFileOptions& options,
      const google_apis::FileResourceCallback& callback,
      const google_apis::ProgressCallback& progress_callback) override;
  google_apis::CancelCallback AuthorizeApp(
      const std::string& resource_id,
      const std::string& app_id,
      const google_apis::AuthorizeAppCallback& callback) override;
  google_apis::CancelCallback UninstallApp(
      const std::string& app_id,
      const google_apis::EntryActionCallback& callback) override;
  google_apis::CancelCallback AddPermission(
      const std::string& resource_id,
      const std::string& email,
      google_apis::drive::PermissionRole role,
      const google_apis::EntryActionCallback& callback) override;

  // Adds a new file with the given parameters. On success, returns
  // HTTP_CREATED with the parsed entry.
  // |callback| must not be null.
  void AddNewFile(const std::string& content_type,
                  const std::string& content_data,
                  const std::string& parent_resource_id,
                  const std::string& title,
                  bool shared_with_me,
                  const google_apis::FileResourceCallback& callback);

  // Adds a new file with the given |resource_id|. If the id already exists,
  // it's an error. This is used for testing cross profile file sharing that
  // needs to have matching resource IDs in different fake service instances.
  // |callback| must not be null.
  void AddNewFileWithResourceId(
      const std::string& resource_id,
      const std::string& content_type,
      const std::string& content_data,
      const std::string& parent_resource_id,
      const std::string& title,
      bool shared_with_me,
      const google_apis::FileResourceCallback& callback);

  // Adds a new directory with the given |resource_id|.
  // |callback| must not be null.
  google_apis::CancelCallback AddNewDirectoryWithResourceId(
      const std::string& resource_id,
      const std::string& parent_resource_id,
      const std::string& directory_title,
      const AddNewDirectoryOptions& options,
      const google_apis::FileResourceCallback& callback);

  // Sets the last modified time for an entry specified by |resource_id|.
  // On success, returns HTTP_SUCCESS with the parsed entry.
  // |callback| must not be null.
  void SetLastModifiedTime(
      const std::string& resource_id,
      const base::Time& last_modified_time,
      const google_apis::FileResourceCallback& callback);

  // Sets the user's permission for an entry specified by |resource_id|.
  google_apis::DriveApiErrorCode SetUserPermission(
      const std::string& resource_id,
      google_apis::drive::PermissionRole user_permission);

  void AddChangeObserver(ChangeObserver* observer);
  void RemoveChangeObserver(ChangeObserver* observer);

 private:
  struct EntryInfo;
  struct UploadSession;

  // Returns a pointer to the entry that matches |resource_id|, or NULL if
  // not found.
  EntryInfo* FindEntryByResourceId(const std::string& resource_id);

  // Returns a new resource ID, which looks like "resource_id_<num>" where
  // <num> is a monotonically increasing number starting from 1.
  std::string GetNewResourceId();

  // Increments |largest_changestamp_| and adds the new changestamp.
  void AddNewChangestamp(google_apis::ChangeResource* change);

  // Update ETag of |file| based on |largest_changestamp_|.
  void UpdateETag(google_apis::FileResource* file);

  // Adds a new entry based on the given parameters.
  // |resource_id| can be empty, in the case, the id is automatically generated.
  // Returns a pointer to the newly added entry, or NULL if failed.
  const EntryInfo* AddNewEntry(
      const std::string& resource_id,
      const std::string& content_type,
      const std::string& content_data,
      const std::string& parent_resource_id,
      const std::string& title,
      bool shared_with_me);

  // Core implementation of GetChangeList.
  // This method returns the slice of the all matched entries, and its range
  // is between |start_offset| (inclusive) and |start_offset| + |max_results|
  // (exclusive).
  // Increments *load_counter by 1 before it returns successfully.
  void GetChangeListInternal(
      int64 start_changestamp,
      const std::string& search_query,
      const std::string& directory_resource_id,
      int start_offset,
      int max_results,
      int* load_counter,
      const google_apis::ChangeListCallback& callback);

  // Returns new upload session URL.
  GURL GetNewUploadSessionUrl();

  void NotifyObservers();

  // The class is expected to run on UI thread.
  base::ThreadChecker thread_checker_;

  typedef std::map<std::string, EntryInfo*> EntryInfoMap;
  EntryInfoMap entries_;
  scoped_ptr<google_apis::AboutResource> about_resource_;
  scoped_ptr<base::DictionaryValue> app_info_value_;
  std::map<GURL, UploadSession> upload_sessions_;
  int64 published_date_seq_;
  int64 next_upload_sequence_number_;
  int default_max_results_;
  int resource_id_count_;
  int file_list_load_count_;
  int change_list_load_count_;
  int directory_load_count_;
  int about_resource_load_count_;
  int app_list_load_count_;
  int blocked_file_list_load_count_;
  bool offline_;
  bool never_return_all_file_list_;
  base::FilePath last_cancelled_file_;
  GURL share_url_base_;
  std::string app_json_template_;
  std::string open_url_format_;

  ObserverList<ChangeObserver> change_observers_;

  base::WeakPtrFactory<FakeDriveService> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(FakeDriveService);
};

}  // namespace drive

#endif  // CHROME_BROWSER_DRIVE_FAKE_DRIVE_SERVICE_H_