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

#include "lts_selection_popup.h"
#include "ui_lts_selection_popup.h"
#include "lts_base.h"

#include <QSortFilterProxyModel>
#include <QAbstractItemModel>
#include <QRadioButton>
#include <QScrollBar>

//#define NEVER
#ifdef NEVER
#  include <QDebug>
#endif // NEVER


namespace LtsWidgets
{

class RadioButton : public QRadioButton
{
  Q_OBJECT

public:
  explicit RadioButton(int row, const QString &text)
    : QRadioButton(text)
    , m_row(row)
  {}

  int row() const { return m_row; }

signals:
  void doubleClickEvent();

private:
  int m_row;

  void mouseDoubleClickEvent(QMouseEvent *) override
  {
    emit doubleClickEvent();
  }
};



LtsSelectionPopup::LtsSelectionPopup(QAbstractItemModel* model,
                                   int currentIndex,
                                   QWidget *parent)
  : LtsFramelessDialog(parent, Behaviour::Popup)
  , m_ui(new Ui::LtsSelectionPopup) // TODO: morph .ui to QDialog (is QWidget)
  , m_currentIndex(currentIndex)
  , m_firstIndex(currentIndex)
  , m_filter(new QSortFilterProxyModel(this))
  , m_valid(false)
{
  m_ui->setupUi(this); // i am sorry for this solution, but qlistview's are so unthankfully to work with

  m_filter->setSourceModel(model);
  m_filter->setFilterCaseSensitivity(Qt::CaseInsensitive);

  slotFilterChanged();
  #ifdef TABLET_MODE
    m_ui->leSearch->setVisible(false);
    m_ui->label->setVisible(false);
  #endif
  connect(m_ui->pbCancel, &QPushButton::clicked, this, &LtsSelectionPopup::reject);
  connect(m_ui->pbSelect, &QPushButton::clicked, this, &LtsSelectionPopup::accept);
  connect(m_ui->leSearch, &QLineEdit::textEdited,
          this, &LtsSelectionPopup::slotFilterChanged);

  #ifdef NEVER
  // debugging :
//  // highlighted -> UserInteraction
//  connect(this, static_cast<void (LtsSelectionPopup::*)(int)>(&LtsSelectionPopup::highlighted), this, [](int idx){
//    qCritical() << " called: highlighted(int)";
//  });

  // currentIndexChanged -> programmatically & UserInteraction
  connect(this, static_cast<void (LtsSelectionPopup::*)(int)>(&LtsSelectionPopup::currentIndexChanged), this, [](int idx){
    qCritical() << " LtsSelectionPopup: called: currentIndexChanged(int), idx=" << idx;
  });

  // activated -> UserInteraction
  connect(this, static_cast<void (LtsSelectionPopup::*)(int)>(&LtsSelectionPopup::activated), this, [](int idx){
    qCritical() << " LtsSelectionPopup: called: activated(int), idx=" << idx;
  });
  // : debugging
  #endif // NEVER
}


LtsSelectionPopup::~LtsSelectionPopup()
{
  delete m_ui;
}


void LtsSelectionPopup::slotFilterChanged()
{
  m_filter->setFilterWildcard(m_ui->leSearch->text().count() ? m_ui->leSearch->text() : QStringLiteral("*") /* show everything if nothing was entered */);
  refresh();
}


void LtsSelectionPopup::refresh()
{
  m_valid = false; // invalidate, none selected as all deleted
  qDeleteAll(m_ui->itemLayoutWidget->findChildren<RadioButton*>()); // delete all RBs
  QLayoutItem *tem = nullptr;
  if (m_ui->itemLayoutWidget->layout()->count() > 0)
  {
    tem  = m_ui->itemLayoutWidget->layout()->takeAt(0);
  }

  int count = m_filter->rowCount();

  for (int i = 0; i < count; i++)
  {
    int realRow = m_filter->mapToSource(m_filter->index(i, 0)).row();

    RadioButton *rbItem = new RadioButton(realRow, m_filter->data(m_filter->index(i, 0)).toString());
    int disable = m_filter->data(m_filter->index(i, 0), Qt::UserRole-1).toInt();
    if (disable == 1)
      rbItem->setEnabled(false);
    m_ui->itemLayoutWidget->layout()->addWidget(rbItem);

    if (realRow == m_currentIndex)
    {
      rbItem->setChecked(true);
      m_valid = true;
    }

    connect(rbItem, &RadioButton::doubleClickEvent,
            this, &LtsSelectionPopup::accept); // is always selected then..
    connect(rbItem, &RadioButton::toggled,
            this, [this](bool checked)
    {
      if (checked)
        m_ui->pbSelect->setEnabled(true);
    });
  }
  if (tem)
    m_ui->itemLayoutWidget->layout()->addItem(tem);

  if (count == 1) // if there is only one item, then allow the user to click Select (or pressing enter) to select the only item available
    m_valid = true;

  m_ui->pbSelect->setEnabled(m_valid);
}


void LtsSelectionPopup::showEvent(QShowEvent *event)
{
  LtsFramelessDialog::showEvent(event);
  m_ui->leSearch->setFocus();

  resize(sizeHint().width() + m_ui->scrollArea->horizontalScrollBar()->height() , sizeHint().height());
}


void LtsSelectionPopup::selectItem(int row, bool bCurrentIndexChanged, bool bActivated)
{
  // order of signals (like Qt 5.9): 1st: currentIndexChanged 2nd: activated

  if (bCurrentIndexChanged)
    emit currentIndexChanged(row);

  if (bActivated)
    emit activated(row);

  m_ui->pbSelect->setEnabled(true);

  LtsFramelessDialog::accept(); // only accept if one item is selected
}


void LtsSelectionPopup::accept()
{
  const QList<RadioButton *> items = m_ui->itemLayoutWidget->findChildren<RadioButton *>();

  int count = items.count();

  for (int i = 0; i < count; i++)
  {
    const RadioButton *rb = items.at(i);

    if (rb->isChecked())
    {
      int realRow = m_filter->mapToSource(m_filter->index(i, 0)).row();

      bool bCurrentIndexChanged  = realRow != m_firstIndex;     // currentIndex has changed?
      bool bActivated            = true;
      selectItem(realRow, bCurrentIndexChanged, bActivated);    // & closes dialog
      return; // no need to go further
    }
  }

  // okay, nothing was selected, is there only one item available? if yes, select it and accept
  if (count == 1)
  {
    const RadioButton *rb = items.at(0);
    selectItem(rb->row(), true, true); // item was not selected before, so it must also be emitted as "activated"     // & closes dialog
    return; // no need to go further
  }
  // none selected and multiple choises? ignore..
}

} // namespace LtsWidgets

#include "lts_selection_popup.moc"