////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2013-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// 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
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_dialog_h)
#define octave_dialog_h 1

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

// 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;

namespace octave
{
  class base_qobject;

  class QUIWidgetCreator : public QObject
  {
    Q_OBJECT

  public:

    QUIWidgetCreator (base_qobject& oct_qobj);

    ~QUIWidgetCreator (void) = default;

  public:

    QString rm_amp (const QString& text);

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

    int get_dialog_result (void) { return m_dialog_result; }

    QString get_dialog_button (void) { return m_dialog_button; }

    QPair<QIntList, int> list_dialog (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);

    QIntList get_list_index (void) const { return m_list_index; }

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

    QStringList get_string_list (void) const { return m_string_list; }

    QStringList file_dialog (const QStringList& filters, const QString& title,
                             const QString& filename, const QString& dirname,
                             const QString& multimode);

    QString get_dialog_path (void) const { return m_path_name; }

    void lock (void) { m_mutex.lock (); }
    void wait (void) { m_waitcondition.wait (&m_mutex); }
    void unlock (void) { m_mutex.unlock (); }
    void wake_all (void) { m_waitcondition.wakeAll (); }

  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&);

    void create_filedialog (const QStringList& filters, const QString& title,
                            const QString& filename, const QString& dirname,
                            const QString& multimode);
  public slots:

    void handle_create_dialog (const QString& message, const QString& title,
                               const QString& icon, const QStringList& button,
                               const QString& defbutton,
                               const QStringList& role);

    void dialog_button_clicked (QAbstractButton *button);

    void handle_create_listview (const QStringList& list, const QString& mode,
                                 int width, int height,
                                 const QIntList& initial,
                                 const QString& name,
                                 const QStringList& prompt,
                                 const QString& ok_string,
                                 const QString& cancel_string);

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

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

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

    void handle_create_filedialog (const QStringList& filters,
                                   const QString& title,
                                   const QString& filename,
                                   const QString& dirname,
                                   const QString& multimode);

    void filedialog_finished (const QStringList& files, const QString& path,
                              int filterindex);

  private:

    base_qobject& m_octave_qobj;

    int m_dialog_result;
    QString m_dialog_button;

    // A copy of the dialogs button texts
    QStringList m_button_list;

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

    QString m_path_name;

    // 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 m_mutex;
    QWaitCondition m_waitcondition;
  };

  class MessageDialog : public QMessageBox
  {
    Q_OBJECT

  public:

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

    ~MessageDialog (void) = default;

  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 (nullptr);
    }
  };

  class ListDialog : public QDialog
  {
    Q_OBJECT

    QItemSelectionModel *selector;

  public:

    ListDialog (base_qobject& oct_qobj, 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);

    ~ListDialog (void) = default;

  signals:

    void finish_selection (const QIntList&, int);

  public slots:

    void buttonOk_clicked (void);

    void buttonCancel_clicked (void);

    void reject (void);

    void item_double_clicked (const QModelIndex&);

  private:

    QAbstractItemModel *m_model;
  };

  class InputDialog : public QDialog
  {
    Q_OBJECT

    QList<QLineEdit *> input_line;

  public:

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

    ~InputDialog (void) = default;

  signals:

    void finish_input (const QStringList&, int);

  public slots:

    void buttonOk_clicked (void);

    void buttonCancel_clicked (void);

    void reject (void);
  };

  class FileDialog : public QFileDialog
  {
    Q_OBJECT

  public:

    FileDialog (base_qobject& oct_qobj, const QStringList& filters,
                const QString& title, const QString& filename,
                const QString& dirname, const QString& multimode);

    ~FileDialog (void) = default;

  signals:

    void finish_input (const QStringList&, const QString&, int);

  private slots:

    void acceptSelection (void);

    void rejectSelection (void);
  };
}

#endif