/***************************************************************************
    qgsstatisticalsummarydockwidget.h
    ---------------------------------
    begin                : May 2015
    copyright            : (C) 2015 by Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSSTATISTICALSUMMARYDOCKWIDGET_H
#define QGSSTATISTICALSUMMARYDOCKWIDGET_H

#include <QMap>
#include "ui_qgsstatisticalsummarybase.h"

#include "qgsstatisticalsummary.h"
#include "qgsstringstatisticalsummary.h"
#include "qgsdatetimestatisticalsummary.h"
#include "qgsdockwidget.h"
#include "qgis_app.h"

class QgsBrowserModel;
class QModelIndex;
class QgsDockBrowserTreeView;
class QgsLayerItem;
class QgsDataItem;
class QgsBrowserTreeFilterProxyModel;

/** A dock widget which displays a statistical summary of the values in a field or expression
 */
class APP_EXPORT QgsStatisticalSummaryDockWidget : public QgsDockWidget, private Ui::QgsStatisticalSummaryWidgetBase, private QgsExpressionContextGenerator
{
    Q_OBJECT

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

    /** Returns the currently active layer for the widget
     * @note added in QGIS 2.12
     */
    QgsVectorLayer* layer() const { return mLayer; }

  public slots:

    /** Recalculates the displayed statistics
     */
    void refreshStatistics();

  private slots:

    void layerChanged( QgsMapLayer* layer );
    void statActionTriggered( bool checked );
    void layersRemoved( const QStringList& layers );
    void layerSelectionChanged();

  private:

    QgsVectorLayer* mLayer = nullptr;

    QMap< int, QAction* > mStatsActions;
    static QList< QgsStatisticalSummary::Statistic > sDisplayStats;
    static QList< QgsStringStatisticalSummary::Statistic > sDisplayStringStats;
    static QList< QgsDateTimeStatisticalSummary::Statistic > sDisplayDateTimeStats;

    void updateNumericStatistics( bool selectedOnly );
    void updateStringStatistics( bool selectedOnly );
    void updateDateTimeStatistics( bool selectedOnly );
    void addRow( int row, const QString& name, const QString& value, bool showValue );

    QgsExpressionContext createExpressionContext() const override;
};

#endif // QGSSTATISTICALSUMMARYDOCKWIDGET_H