/*

Copyright (C) 2013 John W. Eaton
Copyright (C) 2011-2012 Jacob Dawid

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/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <QTreeWidget>

#include "utils.h"

#include "workspace-model.h"

workspace_model::workspace_model (QObject *p)
  : QAbstractTableModel (p)
{
  _columnNames.append (tr ("Name"));
  _columnNames.append (tr ("Class"));
  _columnNames.append (tr ("Dimension"));
  _columnNames.append (tr ("Value"));
  _columnNames.append (tr ("Storage Class"));
}

int
workspace_model::rowCount(const QModelIndex& p) const
{
  return _symbols.size ();
}

int
workspace_model::columnCount (const QModelIndex& p) const
{
  return _columnNames.size ();
}

Qt::ItemFlags
workspace_model::flags (const QModelIndex& idx) const
{
  Qt::ItemFlags retval = 0;

  if (idx.isValid ())
    {
      retval |= Qt::ItemIsEnabled;

      if (_top_level && idx.column () == 0)
        retval |= Qt::ItemIsSelectable;
    }

  return retval;
}

QVariant
workspace_model::headerData (int section, Qt::Orientation orientation,
                             int role) const
{
  if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
    return _columnNames[section];
  else
    return QVariant();
}

QVariant
workspace_model::data (const QModelIndex& idx, int role) const
{
  QVariant retval;

  if (idx.isValid ()
      && (role == Qt::DisplayRole
          || (idx.column () == 0 && (role == Qt::EditRole
                                     || role == Qt::ToolTipRole))))
    {
      switch (idx.column ())
        {
        case 0:
          if (role == Qt::ToolTipRole)
            retval = QVariant (tr ("Right click to copy, rename, or display"));
          else
            retval = QVariant (_symbols[idx.row()]);
          break;

        case 1:
          retval = QVariant (_class_names[idx.row()]);
          break;

        case 2:
          retval = QVariant (_dimensions[idx.row()]);
          break;

        case 3:
          retval = QVariant (_values[idx.row()]);
          break;

        case 4:
          {
            QChar c = _scopes[idx.row()];

            if (c == 'g')
              retval = QVariant (tr ("global"));
            else if (c == 'p')
              retval = QVariant (tr ("persistent"));
            else if (c == 'a')
              retval = QVariant (tr ("automatic"));
            else if (c == 'f')
              retval = QVariant (tr ("function parameter"));
            else if (c == 'h')
              retval = QVariant (tr ("hidden"));
            else if (c == 'i')
              retval = QVariant (tr ("inherited"));
          }

        default:
          break;
        }
    }

  return retval;
}

bool
workspace_model::setData (const QModelIndex& idx, const QVariant& value,
                          int role)
{
  bool retval = false;

  if (idx.column () == 0 && role == Qt::EditRole)
    {
      QString qold_name = _symbols[idx.row()];

      QString qnew_name = value.toString ();

      std::string new_name = qnew_name.toStdString ();

      if (valid_identifier (new_name))
        {
          emit rename_variable (qold_name, qnew_name);

          retval = true;
        }
    }

  return retval;
}


void
workspace_model::set_workspace (bool top_level,
                                const QString& scopes,
                                const QStringList& symbols,
                                const QStringList& class_names,
                                const QStringList& dimensions,
                                const QStringList& values)
{
  _top_level = top_level;
  _scopes = scopes;
  _symbols = symbols;
  _class_names = class_names;
  _dimensions = dimensions;
  _values = values;

  update_table ();

  emit model_changed ();
}

void
workspace_model::clear_workspace (void)
{
  clear_data ();
  update_table ();

  emit model_changed ();
}

void
workspace_model::clear_data (void)
{
  _top_level = false;
  _scopes = QString ();
  _symbols = QStringList ();
  _class_names = QStringList ();
  _dimensions = QStringList ();
  _values = QStringList ();
}

void
workspace_model::update_table (void)
{
  beginResetModel();

  // Nothing to do except tell the world to recalc.

  endResetModel ();

  emit model_changed ();
}