// 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_GOOGLE_APIS_GDATA_WAPI_SERVICE_H_
#define CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_SERVICE_H_

#include <string>

#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "chrome/browser/google_apis/auth_service_observer.h"
#include "chrome/browser/google_apis/drive_service_interface.h"
#include "chrome/browser/google_apis/gdata_wapi_operations.h"
#include "chrome/browser/google_apis/gdata_wapi_url_generator.h"

class FilePath;
class GURL;
class Profile;

namespace net {
class URLRequestContextGetter;
}  // namespace net

namespace google_apis {
class AuthService;
class OperationRunner;

// This class provides documents feed service calls for WAPI (codename for
// DocumentsList API).
// Details of API call are abstracted in each operation class and this class
// works as a thin wrapper for the API.
class GDataWapiService : public DriveServiceInterface,
                         public AuthServiceObserver,
                         public OperationRegistryObserver {
 public:
  // Instance is usually created by DriveSystemServiceFactory and owned by
  // DriveFileSystem.
  //
  // |url_request_context_getter| is used to initialize URLFetcher.
  // |base_url| is used to generate URLs for communicating with the WAPI
  // |custom_user_agent| is used for the User-Agent header in HTTP
  // requests issued through the service if the value is not empty.
  GDataWapiService(net::URLRequestContextGetter* url_request_context_getter,
                   const GURL& base_url,
                   const std::string& custom_user_agent);
  virtual ~GDataWapiService();

  AuthService* auth_service_for_testing();

  // DriveServiceInterface Overrides
  virtual void Initialize(Profile* profile) OVERRIDE;
  virtual void AddObserver(DriveServiceObserver* observer) OVERRIDE;
  virtual void RemoveObserver(DriveServiceObserver* observer) OVERRIDE;
  virtual bool CanStartOperation() const OVERRIDE;
  virtual void CancelAll() OVERRIDE;
  virtual bool CancelForFilePath(const FilePath& file_path) OVERRIDE;
  virtual OperationProgressStatusList GetProgressStatusList() const OVERRIDE;
  virtual bool HasAccessToken() const OVERRIDE;
  virtual bool HasRefreshToken() const OVERRIDE;
  virtual std::string GetRootResourceId() const OVERRIDE;
  virtual void GetResourceList(
      const GURL& feed_url,
      int64 start_changestamp,
      const std::string& search_query,
      bool shared_with_me,
      const std::string& directory_resource_id,
      const GetResourceListCallback& callback) OVERRIDE;
  virtual void GetResourceEntry(
      const std::string& resource_id,
      const GetResourceEntryCallback& callback) OVERRIDE;
  virtual void GetAccountMetadata(
      const GetAccountMetadataCallback& callback) OVERRIDE;
  virtual void GetAppList(const GetAppListCallback& callback) OVERRIDE;
  virtual void DeleteResource(const std::string& resource_id,
                              const EntryActionCallback& callback) OVERRIDE;
  virtual void DownloadFile(
      const FilePath& virtual_path,
      const FilePath& local_cache_path,
      const GURL& content_url,
      const DownloadActionCallback& download_action_callback,
      const GetContentCallback& get_content_callback) OVERRIDE;
  virtual void CopyHostedDocument(
      const std::string& resource_id,
      const std::string& new_name,
      const GetResourceEntryCallback& callback) OVERRIDE;
  virtual void RenameResource(
      const std::string& resource_id,
      const std::string& new_name,
      const EntryActionCallback& callback) OVERRIDE;
  virtual void AddResourceToDirectory(
      const std::string& parent_resource_id,
      const GURL& edit_url,
      const EntryActionCallback& callback) OVERRIDE;
  virtual void RemoveResourceFromDirectory(
      const std::string& parent_resource_id,
      const std::string& resource_id,
      const EntryActionCallback& callback) OVERRIDE;
  virtual void AddNewDirectory(
      const std::string& parent_resource_id,
      const std::string& directory_name,
      const GetResourceEntryCallback& callback) OVERRIDE;
  virtual void InitiateUpload(
      const InitiateUploadParams& params,
      const InitiateUploadCallback& callback) OVERRIDE;
  virtual void ResumeUpload(
      const ResumeUploadParams& params,
      const ResumeUploadCallback& callback) OVERRIDE;
  virtual void AuthorizeApp(
      const GURL& edit_url,
      const std::string& app_id,
      const AuthorizeAppCallback& callback) OVERRIDE;

 private:
  OperationRegistry* operation_registry() const;

  // AuthService::Observer override.
  virtual void OnOAuth2RefreshTokenChanged() OVERRIDE;

  // DriveServiceObserver Overrides
  virtual void OnProgressUpdate(
      const OperationProgressStatusList& list) OVERRIDE;
  virtual void OnAuthenticationFailed(
      GDataErrorCode error) OVERRIDE;

  net::URLRequestContextGetter* url_request_context_getter_;  // Not owned.
  scoped_ptr<OperationRunner> runner_;
  ObserverList<DriveServiceObserver> observers_;
  // Operation objects should hold a copy of this, rather than a const
  // reference, as they may outlive this object.
  GDataWapiUrlGenerator url_generator_;
  const std::string custom_user_agent_;

  DISALLOW_COPY_AND_ASSIGN(GDataWapiService);
};

}  // namespace google_apis

#endif  // CHROME_BROWSER_GOOGLE_APIS_GDATA_WAPI_SERVICE_H_