/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Clementine is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef LIBRARYFILTERWIDGET_H
#define LIBRARYFILTERWIDGET_H

#include <QMap>
#include <QWidget>
#include <memory>

#include "librarymodel.h"
#include "savedgroupingmanager.h"

class GroupByDialog;
class SettingsDialog;
class Ui_LibraryFilterWidget;

struct QueryOptions;

class QMenu;
class QActionGroup;

class LibraryFilterWidget : public QWidget {
  Q_OBJECT

 public:
  LibraryFilterWidget(QWidget* parent = nullptr);
  ~LibraryFilterWidget();

  static const int kFilterDelay = 500;  // msec

  enum DelayBehaviour {
    AlwaysInstant,
    DelayedOnLargeLibraries,
    AlwaysDelayed,
  };

  static QActionGroup* CreateGroupByActions(QObject* parent);

  void UpdateGroupByActions();
  void SetFilterHint(const QString& hint);
  void SetApplyFilterToLibrary(bool filter_applies_to_model) {
    filter_applies_to_model_ = filter_applies_to_model;
  }
  void SetDelayBehaviour(DelayBehaviour behaviour) {
    delay_behaviour_ = behaviour;
  }
  void SetAgeFilterEnabled(bool enabled);
  void SetGroupByEnabled(bool enabled);
  void ShowInLibrary(const QString& search);

  QMenu* menu() const { return library_menu_; }
  void AddMenuAction(QAction* action);

  void SetSettingsGroup(const QString& group) { settings_group_ = group; }
  void SetLibraryModel(LibraryModel* model);

 public slots:
  void SetQueryMode(QueryOptions::QueryMode view);
  void FocusOnFilter(QKeyEvent* e);

 signals:
  void UpPressed();
  void DownPressed();
  void ReturnPressed();
  void Filter(const QString& text);

 protected:
  void keyReleaseEvent(QKeyEvent* e);

 private slots:
  void GroupingChanged(const LibraryModel::Grouping& g);
  void GroupByClicked(QAction* action);
  void SaveGroupBy();
  void ShowGroupingManager();

  void FilterTextChanged(const QString& text);
  void FilterDelayTimeout();

 private:
  static QAction* CreateGroupByAction(const QString& text, QObject* parent,
                                      const LibraryModel::Grouping& grouping);
  void CheckCurrentGrouping(const LibraryModel::Grouping& g);

 private:
  Ui_LibraryFilterWidget* ui_;
  LibraryModel* model_;

  std::unique_ptr<GroupByDialog> group_by_dialog_;
  std::unique_ptr<SavedGroupingManager> groupings_manager_;
  SettingsDialog* settings_dialog_;

  QMenu* filter_age_menu_;
  QMenu* group_by_menu_;
  QMenu* library_menu_;
  QActionGroup* group_by_group_;
  QMap<QAction*, int> filter_ages_;

  QTimer* filter_delay_;

  bool filter_applies_to_model_;
  DelayBehaviour delay_behaviour_;

  QString settings_group_;
};

#endif  // LIBRARYFILTERWIDGET_H