/*

Copyright (C) 2013 John W. Eaton
Copyright (C) 2013 Daniel J. Sebald

This file is part of Octave.

Octave 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.

Octave 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 Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#if !defined (octave_guifcn_dialog_h)
#define octave_guifcn_dialog_h 1

#include <QMutex>
#include <QWaitCondition>
#include <QAbstractButton>
#include <QList>
#include <QItemSelectionModel>
#include <QDialog>
#include <QMessageBox>
#include <QLineEdit>

// Defined for purposes of sending QList<int> as part of signal.
typedef QList<int> QIntList;

// Defined for purposes of sending QList<float> as part of signal.
typedef QList<float> QFloatList;


class QUIWidgetCreator : public QObject
{
  Q_OBJECT

public:

  QUIWidgetCreator (void);

  ~QUIWidgetCreator (void);

public:

  void signal_dialog (const QString& message, const QString& title,
                      const QString& icon, const QStringList& button,
                      const QString& defbutton, const QStringList& role)
  {

    // Use the last button in the list as the reject result, i.e., when no
    // button is pressed such as in the case of the upper right close tab.
    if (!button.isEmpty ())
      dialog_button = button.last ();

    QString xicon = icon;
    if (xicon.isEmpty ())
      xicon = "none";

    emit create_dialog (message, title, xicon, button, defbutton, role);
  };

  int get_dialog_result (void) { return dialog_result; }

  QString get_dialog_button (void) { return dialog_button; }

  bool signal_listview (const QStringList& list, const QString& mode,
                        int wd, int ht, const QList<int>& initial,
                        const QString& name, const QStringList& prompt,
                        const QString& ok_string, const QString& cancel_string)
  {
    if (list.isEmpty ())
      return false;

    emit create_listview (list, mode, wd, ht, initial, name,
                          prompt, ok_string, cancel_string);

    return true;
  };

  const QIntList *get_list_index (void) { return list_index; }

  bool signal_inputlayout (const QStringList& prompt, const QString& title,
                           const QFloatList& nr, const QFloatList& nc,
                           const QStringList& defaults)
  {
    if (prompt.isEmpty ())
      return false;

    emit create_inputlayout (prompt, title, nr, nc, defaults);

    return true;
  };

  const QStringList *get_string_list (void) { return string_list; }
  
  void wait (void)
  {
    // Wait while the user is responding to message box.
    waitcondition.wait (&mutex);
  }

signals:

  void create_dialog (const QString&, const QString&, const QString&,
                      const QStringList&, const QString&, const QStringList&);

  void create_listview (const QStringList&, const QString&, int, int,
                        const QIntList&, const QString&, const QStringList&,
                        const QString&, const QString&);

  void create_inputlayout (const QStringList&, const QString&,
                           const QFloatList&, const QFloatList&,
                           const QStringList&);

public slots:

  void dialog_button_clicked (QAbstractButton *button);

  void list_select_finished (const QIntList& selected,
                             const int button_pressed);

  void input_finished (const QStringList& input, const int button_pressed);

private:

  int dialog_result;
  QString dialog_button;

  // The list could conceivably be big.  Not sure how things are
  // stored internally, so keep off of the stack.
  QStringList *string_list;
  QIntList *list_index;

  // GUI objects cannot be accessed in the non-GUI thread.  However,
  // signals can be sent to slots across threads with proper
  // synchronization.  Hence, the use of QWaitCondition.

  QMutex mutex;

  QWaitCondition waitcondition;
};

extern QUIWidgetCreator uiwidget_creator;


class MessageDialog : public QMessageBox
{
  Q_OBJECT

public:

  explicit MessageDialog (const QString& message, const QString& title,
                          const QString& icon, const QStringList& button,
                          const QString& defbutton,
                          const QStringList& role);

private:

  void closeEvent (QCloseEvent *)
  {
    // Reroute the close tab to a button click so there is only a single
    // route to waking the wait condition.
    emit buttonClicked (0);
  }
};


class ListDialog : public QDialog
{
  Q_OBJECT

  QItemSelectionModel *selector;

public:

  explicit ListDialog (const QStringList& list, const QString& mode,
                       int width, int height, const QList<int>& initial,
                       const QString& name, const QStringList& prompt,
                       const QString& ok_string, const QString& cancel_string);

signals:

  void finish_selection (const QIntList&, const int);

public slots:

  void buttonOk_clicked (void);

  void buttonCancel_clicked (void);

  void reject (void);
};


class InputDialog : public QDialog
{
  Q_OBJECT

  QList<QLineEdit *> input_line;

public:

  explicit InputDialog (const QStringList& prompt, const QString& title,
                        const QFloatList& nr, const QFloatList& nc,
                        const QStringList& defaults);

signals:

  void finish_input (const QStringList&, const int);

public slots:

  void buttonOk_clicked (void);

  void buttonCancel_clicked (void);

  void reject (void);
};

#endif