// Copyright 2014 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 COMPONENTS_GCM_DRIVER_FAKE_GCM_CLIENT_H_
#define COMPONENTS_GCM_DRIVER_FAKE_GCM_CLIENT_H_

#include <map>

#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "components/gcm_driver/gcm_client.h"

namespace base {
class SequencedTaskRunner;
}

namespace gcm {

class FakeGCMClient : public GCMClient {
 public:
  // For testing purpose.
  enum StartModeOverridding {
    // No change to how delay start is handled.
    RESPECT_START_MODE,
    // Force to delay start GCM until PerformDelayedStart is called.
    FORCE_TO_ALWAYS_DELAY_START_GCM,
  };

  // Generate and return the registration ID/token based on parameters for
  // testing verification.
  static std::string GenerateGCMRegistrationID(
      const std::vector<std::string>& sender_ids);
  static std::string GenerateInstanceIDToken(
      const std::string& authorized_entity, const std::string& scope);

  FakeGCMClient(const scoped_refptr<base::SequencedTaskRunner>& ui_thread,
                const scoped_refptr<base::SequencedTaskRunner>& io_thread);
  ~FakeGCMClient() override;

  // Overridden from GCMClient:
  // Called on IO thread.
  void Initialize(
      const ChromeBuildInfo& chrome_build_info,
      const base::FilePath& store_path,
      const scoped_refptr<base::SequencedTaskRunner>& blocking_task_runner,
      const scoped_refptr<net::URLRequestContextGetter>&
          url_request_context_getter,
      scoped_ptr<Encryptor> encryptor,
      Delegate* delegate) override;
  void Start(StartMode start_mode) override;
  void Stop() override;
  void Register(const linked_ptr<RegistrationInfo>& registration_info) override;
  void Unregister(
      const linked_ptr<RegistrationInfo>& registration_info) override;
  void Send(const std::string& app_id,
            const std::string& receiver_id,
            const OutgoingMessage& message) override;
  void SetRecording(bool recording) override;
  void ClearActivityLogs() override;
  GCMStatistics GetStatistics() const override;
  void SetAccountTokens(
      const std::vector<AccountTokenInfo>& account_tokens) override;
  void UpdateAccountMapping(const AccountMapping& account_mapping) override;
  void RemoveAccountMapping(const std::string& account_id) override;
  void SetLastTokenFetchTime(const base::Time& time) override;
  void UpdateHeartbeatTimer(scoped_ptr<base::Timer> timer) override;
  void AddInstanceIDData(const std::string& app_id,
                         const std::string& instance_id,
                         const std::string& extra_data) override;
  void RemoveInstanceIDData(const std::string& app_id) override;
  void GetInstanceIDData(const std::string& app_id,
                         std::string* instance_id,
                         std::string* extra_data) override;
  void AddHeartbeatInterval(const std::string& scope, int interval_ms) override;
  void RemoveHeartbeatInterval(const std::string& scope) override;

  // Initiate the start that has been delayed.
  // Called on UI thread.
  void PerformDelayedStart();

  // Simulate receiving something from the server.
  // Called on UI thread.
  void ReceiveMessage(const std::string& app_id,
                      const IncomingMessage& message);
  void DeleteMessages(const std::string& app_id);

  void set_start_mode_overridding(StartModeOverridding overridding) {
    start_mode_overridding_ = overridding;
  }

 private:
  // Called on IO thread.
  void DoStart();
  void Started();
  void RegisterFinished(
      const linked_ptr<RegistrationInfo>& registration_info,
      const std::string& registrion_id);
  void UnregisterFinished(
      const linked_ptr<RegistrationInfo>& registration_info);
  void SendFinished(const std::string& app_id, const OutgoingMessage& message);
  void MessageReceived(const std::string& app_id,
                       const IncomingMessage& message);
  void MessagesDeleted(const std::string& app_id);
  void MessageSendError(const std::string& app_id,
                        const SendErrorDetails& send_error_details);
  void SendAcknowledgement(const std::string& app_id,
                           const std::string& message_id);

  Delegate* delegate_;
  bool started_;
  StartMode start_mode_;
  StartModeOverridding start_mode_overridding_;
  scoped_refptr<base::SequencedTaskRunner> ui_thread_;
  scoped_refptr<base::SequencedTaskRunner> io_thread_;
  std::map<std::string, std::pair<std::string, std::string>> instance_id_data_;
  base::WeakPtrFactory<FakeGCMClient> weak_ptr_factory_;

  DISALLOW_COPY_AND_ASSIGN(FakeGCMClient);
};

}  // namespace gcm

#endif  // COMPONENTS_GCM_DRIVER_FAKE_GCM_CLIENT_H_