// 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.

#include "athena/activity/public/activity_manager.h"

#include <vector>

#include "base/macros.h"
#include "base/observer_list.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/public/activation_change_observer.h"

namespace athena {

class ActivityManagerObserver;

class ActivityManagerImpl : public ActivityManager,
                            public aura::WindowObserver,
                            public aura::client::ActivationChangeObserver {
 public:
  ActivityManagerImpl();
  ~ActivityManagerImpl() override;

  int num_activities() const { return activities_.size(); }

  // ActivityManager:
  void AddActivity(Activity* activity) override;
  void RemoveActivity(Activity* activity) override;
  const ActivityList& GetActivityList() override;
  Activity* GetActivityForWindow(aura::Window* window) override;
  void AddObserver(ActivityManagerObserver* observer) override;
  void RemoveObserver(ActivityManagerObserver* observer) override;

 private:
  // aura::WindowObserver:
  void OnWindowDestroying(aura::Window* window) override;

  // aura::client::ActivationChangeObserver:
  void OnWindowActivated(aura::Window* gained_active,
                         aura::Window* lost_active) override;

  std::vector<Activity*> activities_;

  ObserverList<ActivityManagerObserver> observers_;

  DISALLOW_COPY_AND_ASSIGN(ActivityManagerImpl);
};

}  // namespace athena