/*

Copyright (C) 2013-2017 John W. Eaton
Copyright (C) 2011-2016 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
<https://www.gnu.org/licenses/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include <QTreeWidget>
#include <QSettings>

#include "symscope.h"
#include "utils.h"

#include "resource-manager.h"
#include "workspace-model.h"

workspace_model::workspace_model (QObject *p)
  : QAbstractTableModel (p)
{
  m_columnNames.append (tr ("Name"));
  m_columnNames.append (tr ("Class"));
  m_columnNames.append (tr ("Dimension"));
  m_columnNames.append (tr ("Value"));
  m_columnNames.append (tr ("Attribute"));

  for (int i = 0; i < resource_manager::storage_class_chars ().length (); i++)
    m_storage_class_colors.append (QColor (Qt::white));

}

QList<QColor>
workspace_model::storage_class_default_colors (void)
{
  QList<QColor> colors;

  if (colors.isEmpty ())
    {
      colors << QColor (190, 255, 255)
             << QColor (220, 255, 220)
             << QColor (220, 220, 255)
             << QColor (255, 255, 190)
             << QColor (255, 220, 220)
             << QColor (255, 190, 255);
    }

  return colors;
}

QStringList
workspace_model::storage_class_names (void)
{
  QStringList names;

  if (names.isEmpty ())
    {
      names << QObject::tr ("automatic")
            << QObject::tr ("function")
            << QObject::tr ("global")
            << QObject::tr ("hidden")
            << QObject::tr ("inherited")
            << QObject::tr ("persistent");
    }

  return names;
}

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

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

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

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

      if (m_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 m_columnNames[section];
  else
    return QVariant ();
}

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

  if (idx.isValid ())
    {
      if (role == Qt::BackgroundColorRole)
        {
          QString class_chars = resource_manager::storage_class_chars ();
          int actual_class
            = class_chars.indexOf (m_scopes[idx.row ()].toLatin1 ());
          if (actual_class >= 0)
            return QVariant (m_storage_class_colors.at (actual_class));
          else
            return retval;
        }

      if (role == Qt::DisplayRole
          || (idx.column () == 0 && role == Qt::EditRole)
          || (idx.column () == 0 && 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 (m_symbols[idx.row ()]);
              break;

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

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

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

            case 4:
              {
                QString sclass;

                QString class_chars = resource_manager::storage_class_chars ();

                int actual_class
                  = class_chars.indexOf (m_scopes[idx.row ()].toLatin1 ());

                if (actual_class >= 0)
                  {
                    QStringList class_names
                      = resource_manager::storage_class_names ();

                    sclass = class_names.at (actual_class);
                  }

                if (m_complex_flags[idx.row ()])
                  {
                    if (sclass.isEmpty ())
                      sclass = tr ("complex");
                    else
                      sclass += ", " + tr ("complex");
                  }

                retval = QVariant (sclass);
              }
              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 = m_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, bool /* debug */,
                                const octave::symbol_scope& scope)
{
  clear_data ();

  m_top_level = top_level;
  m_scope = scope;

  update_table ();
}

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

void
workspace_model::notice_settings (const QSettings *settings)
{
  QList<QColor> default_colors =
    resource_manager::storage_class_default_colors ();
  QString class_chars = resource_manager::storage_class_chars ();

  for (int i = 0; i < class_chars.length (); i++)
    {
      QVariant default_var = default_colors.at (i);
      QColor setting_color = settings->value ("workspaceview/color_"
                                              + class_chars.mid (i,1),
                                              default_var).value<QColor> ();
      m_storage_class_colors.replace (i,setting_color);
    }
}

void
workspace_model::clear_data (void)
{
  m_top_level = false;
  m_scope = octave::symbol_scope ();
  m_scopes = QString ();
  m_symbols = QStringList ();
  m_class_names = QStringList ();
  m_dimensions = QStringList ();
  m_values = QStringList ();
  m_complex_flags = QIntList ();
}

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

  std::list<octave::symbol_record> sr_list = m_scope.all_variables ();

  octave::symbol_record::context_id context = m_scope.current_context ();

  for (const auto& sr : sr_list)
    {
      std::string nm = sr.name ();

      octave_value val = sr.varval (context);

      // FIXME: fix size for objects, see kluge in variables.cc
      //dim_vector dv = val.dims ();
      octave_value tmp = val;
      Matrix sz = tmp.size ();
      dim_vector dv = dim_vector::alloc (sz.numel ());
      for (octave_idx_type i = 0; i < dv.ndims (); i++)
        dv(i) = sz(i);

      char storage = ' ';
      if (sr.is_global ())
        storage = 'g';
      else if (sr.is_persistent ())
        storage = 'p';
      else if (sr.is_automatic ())
        storage = 'a';
      else if (sr.is_formal ())
        storage = 'f';
      else if (sr.is_hidden ())
        storage = 'h';
      else if (sr.is_inherited ())
        storage = 'i';

      std::ostringstream buf;
      val.short_disp (buf);
      std::string short_disp_str = buf.str ();

      m_scopes.append (storage);
      m_symbols.append (QString::fromStdString (nm));
      m_class_names.append (QString::fromStdString (val.class_name ()));
      m_dimensions.append (QString::fromStdString (dv.str ()));
      m_values.append (QString::fromStdString (short_disp_str));
      m_complex_flags.append (val.iscomplex ());
    }

  endResetModel ();

  emit model_changed ();
}