// Copyright (c) 2013 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 UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_
#define UI_MESSAGE_CENTER_MESSAGE_CENTER_IMPL_H_

#include <stddef.h>

#include <memory>
#include <string>
#include <vector>

#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "ui/message_center/message_center.h"
#include "ui/message_center/message_center_observer.h"
#include "ui/message_center/message_center_types.h"
#include "ui/message_center/notification_blocker.h"
#include "ui/message_center/notifier_settings.h"
#include "ui/message_center/popup_timers_controller.h"

namespace message_center {
class NotificationDelegate;
class MessageCenterImpl;

namespace internal {
class ChangeQueue;
}

// The default implementation of MessageCenter.
class MessageCenterImpl : public MessageCenter,
                          public NotificationBlocker::Observer,
                          public message_center::NotifierSettingsObserver {
 public:
  MessageCenterImpl();
  ~MessageCenterImpl() override;

  // MessageCenter overrides:
  void AddObserver(MessageCenterObserver* observer) override;
  void RemoveObserver(MessageCenterObserver* observer) override;
  void AddNotificationBlocker(NotificationBlocker* blocker) override;
  void RemoveNotificationBlocker(NotificationBlocker* blocker) override;
  void SetVisibility(Visibility visible) override;
  bool IsMessageCenterVisible() const override;
  size_t NotificationCount() const override;
  size_t UnreadNotificationCount() const override;
  bool HasPopupNotifications() const override;
  bool IsQuietMode() const override;
  bool IsLockedState() const override;
  bool HasClickedListener(const std::string& id) override;
  message_center::Notification* FindVisibleNotificationById(
      const std::string& id) override;
  const NotificationList::Notifications& GetVisibleNotifications() override;
  NotificationList::PopupNotifications GetPopupNotifications() override;
  void AddNotification(std::unique_ptr<Notification> notification) override;
  void UpdateNotification(
      const std::string& old_id,
      std::unique_ptr<Notification> new_notification) override;
  void RemoveNotification(const std::string& id, bool by_user) override;
  void RemoveAllNotifications(bool by_user, RemoveType type) override;
  void SetNotificationIcon(const std::string& notification_id,
                           const gfx::Image& image) override;
  void SetNotificationImage(const std::string& notification_id,
                            const gfx::Image& image) override;
  void SetNotificationButtonIcon(const std::string& notification_id,
                                 int button_index,
                                 const gfx::Image& image) override;
  void DisableNotificationsByNotifier(const NotifierId& notifier_id) override;
  void ClickOnNotification(const std::string& id) override;
  void ClickOnNotificationButton(const std::string& id,
                                 int button_index) override;
  void ClickOnSettingsButton(const std::string& id) override;
  void MarkSinglePopupAsShown(const std::string& id,
                              bool mark_notification_as_read) override;
  void DisplayedNotification(const std::string& id,
                             const DisplaySource source) override;
  void SetNotifierSettingsProvider(NotifierSettingsProvider* provider) override;
  NotifierSettingsProvider* GetNotifierSettingsProvider() override;
  void SetQuietMode(bool in_quiet_mode) override;
  void SetLockedState(bool locked) override;
  void EnterQuietModeWithExpire(const base::TimeDelta& expires_in) override;
  void RestartPopupTimers() override;
  void PausePopupTimers() override;
  void ForceNotificationFlush(const std::string& id) override;

  // NotificationBlocker::Observer overrides:
  void OnBlockingStateChanged(NotificationBlocker* blocker) override;

  // message_center::NotifierSettingsObserver overrides:
  void UpdateIconImage(const NotifierId& notifier_id,
                       const gfx::Image& icon) override;
  void NotifierGroupChanged() override;
  void NotifierEnabledChanged(const NotifierId& notifier_id,
                              bool enabled) override;

  // Unexposed methods:
  void AddNotificationImmediately(std::unique_ptr<Notification> notification);
  void UpdateNotificationImmediately(
      const std::string& old_id,
      std::unique_ptr<Notification> new_notification);
  void RemoveNotificationImmediately(const std::string& id, bool by_user);

 protected:
  void DisableTimersForTest() override;
  void EnableChangeQueueForTest(bool enable) override;

 private:
  struct NotificationCache {
    NotificationCache();
    ~NotificationCache();
    void Rebuild(const NotificationList::Notifications& notifications);
    void RecountUnread();

    NotificationList::Notifications visible_notifications;
    size_t unread_count;
  };

  void RemoveNotificationsForNotifierId(const NotifierId& notifier_id);

  std::unique_ptr<NotificationList> notification_list_;
  NotificationCache notification_cache_;
  base::ObserverList<MessageCenterObserver> observer_list_;
  std::unique_ptr<PopupTimersController> popup_timers_controller_;
  std::unique_ptr<base::OneShotTimer> quiet_mode_timer_;
  NotifierSettingsProvider* settings_provider_;
  std::vector<NotificationBlocker*> blockers_;

  bool locked_ = false;
  bool visible_ = false;

  // Queue for the notifications to delay the addition/updates when the message
  // center is visible.
  std::unique_ptr<internal::ChangeQueue> notification_queue_;

  DISALLOW_COPY_AND_ASSIGN(MessageCenterImpl);
};

}  // namespace message_center

#endif  // UI_MESSAGE_CENTER_MESSAGE_CENTER_H_