/**
 * @RDE_HEADER@
 * ComboBox's popup, optimized for tablets (bigger dropdown/popup)
 * $Id$
 * $HeadURL$
 * $Author$
 *
 * Created by Mike Wille, SLSE, 2016-03-09
 */

#pragma once

#include "lts_frameless_dialog.h"
#include "lts_widgets_export.h"


namespace Ui
{
class LtsSelectionPopup;
}

class QAbstractItemModel;
class QSortFilterProxyModel;

namespace LtsWidgets
{

/**
 * @brief The LtsSelectionPopup is a popup window (LtsFramelessDialog) with a list of all QRadioButtons from a model with a search/filter edit.
 * (former 'LtsComboBoxPopup' class WAS an internal Popup class for the LtsComboBox and is not meant for export)
 * This is a custom Popup which is touch-friendly and screen-centered.
 */
class LTSWIDGETS_EXPORT LtsSelectionPopup : public LtsFramelessDialog
{
  Q_OBJECT

public:
  /**
   * @brief LtsSelectionPopup creates a popup with all its items (from model) in it
   * @param model the model which contains all items
   * @param currentIndex which item is currently selected (to not select any item: a value smaller than 0)
   * @param parent parent of this widget (not the LtsComboBox, the actual parent)
   */
  LtsSelectionPopup(QAbstractItemModel *model,
                   int currentIndex,
                   QWidget *parent = nullptr);
  ~LtsSelectionPopup();

protected:
  /**
   * @brief showEvent selects the search/filter widget on show
   * @param event
   */
  void showEvent(QShowEvent *event) override;

private:
  Ui::LtsSelectionPopup *m_ui;
  int m_currentIndex;
  int m_firstIndex;
  QSortFilterProxyModel *m_filter;
  bool m_valid; // selection is valid? (e.g. not hidden because it's filtered)

  /**
   * @brief refresh deletes all Radio Buttons and creates them new (e.g. filtering)
   */
  void refresh();

  /**
   * @brief selectItem emits signals that tell the connected slot which item was selected
   * @param row the row number of the model
   * @param text the text of the radio button
   * @param activate if the item was activated (see QRadioButton doc) - by default false as it not not used everytime
   */
  void selectItem(int row, bool bCurrentIndexChanged, bool bActivated);

signals:

  // void highlighted(int index); // not supported yet

  // activated(row);          // Qt::Doc: is only emitted when the change is caused by user interaction

  // currentIndexChanged(row);  // Qt::Doc: is always emitted regardless if the change was done programmatically or by user interaction
                                // My note: If the uses selects the already selected item, only activated is emitted.


  /**
   * @brief activated is emitted when the selection has changed or is confirmded by the user
   * Qt::Doc: is only emitted when the change is caused by user interaction
   * Addon: If the uses selects the already selected item, only activated is emitted.
   */
  void activated(int index);

  /**
   * @brief currentIndexChanged is emitted when the current item changes (by user interaction or programmatically)
   * Qt::Doc: is always emitted regardless if the change was done programmatically or by user interaction
   * Addon: If the uses selects the already selected item, only activated is emitted.
   */
  void currentIndexChanged(int index);

public slots:
  /**
   * @brief accept is called when the selection ends successfully (user double-clicked an item or clicked the 'Select' button) and emits signalSelectItem
   */
  void accept() override;

  /**
   * @brief slotFilterChanged is called if the search / filter text changed and recreates all Radio Buttons after filtering
   */
  void slotFilterChanged();

};
} // namespace LtsWidgets