// 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 "base/files/file_path.h"
#include "base/values.h"
#include "chrome/browser/drive/drive_service_interface.h"
#include "chrome/browser/google_apis/auth_service_interface.h"

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:
  FakeDriveService();
  virtual ~FakeDriveService();

  // Loads the resource list for WAPI. Returns true on success.
  bool LoadResourceListForWapi(const std::string& relative_path);

  // Loads the account metadata for WAPI. Returns true on success.  Also adds
  // the largest changestamp in the account metadata to the existing
  // entries. The changestamp information will be used to generate change
  // lists in GetResourceList() when non-zero |start_changestamp| is
  // specified.
  bool LoadAccountMetadataForWapi(const std::string& relative_path);

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

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

  // Changes the default max results returned from GetResourceList().
  // 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;
  }

  // Returns the largest changestamp, which starts from 0 by default. See
  // also comments at LoadAccountMetadataForWapi().
  int64 largest_changestamp() const { return largest_changestamp_; }

  // Returns the number of times the resource list is successfully loaded by
  // GetAllResourceList().
  int resource_list_load_count() const { return resource_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
  // GetResourceListInDirectory().
  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 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);

  // DriveServiceInterface Overrides
  virtual void Initialize() OVERRIDE;
  virtual void AddObserver(DriveServiceObserver* observer) OVERRIDE;
  virtual void RemoveObserver(DriveServiceObserver* observer) OVERRIDE;
  virtual bool CanSendRequest() const OVERRIDE;
  virtual std::string CanonicalizeResourceId(
      const std::string& resource_id) const OVERRIDE;
  virtual std::string GetRootResourceId() const OVERRIDE;
  virtual bool HasAccessToken() const OVERRIDE;
  virtual void RequestAccessToken(
      const google_apis::AuthStatusCallback& callback) OVERRIDE;
  virtual bool HasRefreshToken() const OVERRIDE;
  virtual void ClearAccessToken() OVERRIDE;
  virtual void ClearRefreshToken() OVERRIDE;
  virtual google_apis::CancelCallback GetAllResourceList(
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetResourceListInDirectory(
      const std::string& directory_resource_id,
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  // See the comment for EntryMatchWidthQuery() in .cc file for details about
  // the supported search query types.
  virtual google_apis::CancelCallback Search(
      const std::string& search_query,
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback SearchByTitle(
      const std::string& title,
      const std::string& directory_resource_id,
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetChangeList(
      int64 start_changestamp,
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback ContinueGetResourceList(
      const GURL& override_url,
      const google_apis::GetResourceListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetResourceEntry(
      const std::string& resource_id,
      const google_apis::GetResourceEntryCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetShareUrl(
      const std::string& resource_id,
      const GURL& embed_origin,
      const google_apis::GetShareUrlCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetAboutResource(
      const google_apis::GetAboutResourceCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback GetAppList(
      const google_apis::GetAppListCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback DeleteResource(
      const std::string& resource_id,
      const std::string& etag,
      const google_apis::EntryActionCallback& callback) OVERRIDE;
  virtual 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;
  virtual google_apis::CancelCallback CopyResource(
      const std::string& resource_id,
      const std::string& parent_resource_id,
      const std::string& new_title,
      const google_apis::GetResourceEntryCallback& callback) OVERRIDE;
  // The new resource ID for the copied document will look like
  // |resource_id| + "_copied".
  virtual google_apis::CancelCallback CopyHostedDocument(
      const std::string& resource_id,
      const std::string& new_title,
      const google_apis::GetResourceEntryCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback RenameResource(
      const std::string& resource_id,
      const std::string& new_title,
      const google_apis::EntryActionCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback TouchResource(
      const std::string& resource_id,
      const base::Time& modified_date,
      const base::Time& last_viewed_by_me_date,
      const google_apis::GetResourceEntryCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback AddResourceToDirectory(
      const std::string& parent_resource_id,
      const std::string& resource_id,
      const google_apis::EntryActionCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback RemoveResourceFromDirectory(
      const std::string& parent_resource_id,
      const std::string& resource_id,
      const google_apis::EntryActionCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback AddNewDirectory(
      const std::string& parent_resource_id,
      const std::string& directory_title,
      const google_apis::GetResourceEntryCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback InitiateUploadNewFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& parent_resource_id,
      const std::string& title,
      const google_apis::InitiateUploadCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback InitiateUploadExistingFile(
      const std::string& content_type,
      int64 content_length,
      const std::string& resource_id,
      const std::string& etag,
      const google_apis::InitiateUploadCallback& callback) OVERRIDE;
  virtual 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::UploadRangeCallback& callback,
      const google_apis::ProgressCallback& progress_callback) OVERRIDE;
  virtual google_apis::CancelCallback GetUploadStatus(
      const GURL& upload_url,
      int64 content_length,
      const google_apis::UploadRangeCallback& callback) OVERRIDE;
  virtual google_apis::CancelCallback AuthorizeApp(
      const std::string& resource_id,
      const std::string& app_id,
      const google_apis::AuthorizeAppCallback& 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::GetResourceEntryCallback& 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::GetResourceEntryCallback& callback);

 private:
  struct UploadSession;

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

  // Returns a pointer to the entry that matches |content_url|, or NULL if
  // not found.
  base::DictionaryValue* FindEntryByContentUrl(const GURL& content_url);

  // 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 and ETag to
  // |entry|.
  void AddNewChangestampAndETag(base::DictionaryValue* entry);

  // Adds a new entry based on the given parameters. |entry_kind| should be
  // "file" or "folder". Returns a pointer to the newly added entry, or NULL
  // if failed.
  const base::DictionaryValue* AddNewEntry(
    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 std::string& entry_kind);

  // Core implementation of GetResourceList.
  // 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 GetResourceListInternal(
      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::GetResourceListCallback& callback);

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

  scoped_ptr<base::DictionaryValue> resource_list_value_;
  scoped_ptr<base::Value> account_metadata_value_;
  scoped_ptr<base::Value> app_info_value_;
  std::map<GURL, UploadSession> upload_sessions_;
  int64 largest_changestamp_;
  int64 published_date_seq_;
  int64 next_upload_sequence_number_;
  int default_max_results_;
  int resource_id_count_;
  int resource_list_load_count_;
  int change_list_load_count_;
  int directory_load_count_;
  int about_resource_load_count_;
  int app_list_load_count_;
  bool offline_;
  base::FilePath last_cancelled_file_;
  GURL share_url_base_;

  DISALLOW_COPY_AND_ASSIGN(FakeDriveService);
};

}  // namespace drive

#endif  // CHROME_BROWSER_DRIVE_FAKE_DRIVE_SERVICE_H_