components/collaboration/internal/messaging/data_sharing_change_notifier.h

// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_
#define COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_

#include "components/data_sharing/public/data_sharing_service.h"
#include "google_apis/gaia/gaia_id.h"

namespace base {
class Time;
}  // namespace base

namespace collaboration::messaging {

class DataSharingChangeNotifier
    : public data_sharing::DataSharingService::Observer {
 public:
  class Observer : public base::CheckedObserver {
   public:
    // Called when the DataSharingServiceChangeNofitier has been initialized.
    // Use DataSharingChangeNotifier::IsInitialized() to check whether it has
    // already been initialized. If the service has already been initialized
    // when an observer is added, this is invoked asynchronously.
    virtual void OnDataSharingChangeNotifierInitialized() {}

    // User either created a new group or has joined an existing one.
    virtual void OnGroupAdded(const data_sharing::GroupData& group_data,
                              const base::Time& event_time) {}
    // Either group has been deleted or user has been removed from the group.
    virtual void OnGroupRemoved(const data_sharing::GroupData& group_id,
                                const base::Time& event_time) {}

    // Called when a new member has been added to the group.
    virtual void OnGroupMemberAdded(const data_sharing::GroupData& group_id,
                                    const GaiaId& member_gaia_id,
                                    const base::Time& event_time) {}
    // Called when a member has been removed from the group.
    virtual void OnGroupMemberRemoved(const data_sharing::GroupData& group_id,
                                      const GaiaId& member_gaia_id,
                                      const base::Time& event_time) {}
  };

  ~DataSharingChangeNotifier() override;

  virtual void AddObserver(Observer* observer) = 0;
  virtual void RemoveObserver(Observer* observer) = 0;

  // Kicks off the initialization of this component.
  virtual void Initialize() = 0;

  // Whether this instance has finished initialization.
  virtual bool IsInitialized() = 0;
};

}  // namespace collaboration::messaging

#endif  // COMPONENTS_COLLABORATION_INTERNAL_MESSAGING_DATA_SHARING_CHANGE_NOTIFIER_H_