/*=========================================================================

   Program: ParaView
   Module:    pqCustomFilterManagerModel.cxx

   Copyright (c) 2005-2008 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2.

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

========================================================================*/

/// \file pqCustomFilterManagerModel.cxx
/// \date 6/23/2006

#include "pqCustomFilterManagerModel.h"

#include <QList>
#include <QPixmap>
#include <QString>
#include <QtDebug>

#include "pqApplicationCore.h"
#include "pqSettings.h"
#include "vtkPVXMLElement.h"
#include "vtkPVXMLParser.h"
#include "vtkSMProxyManager.h"
#include "vtkSMSessionProxyManager.h"
#include <sstream>

class pqCustomFilterManagerModelInternal : public QList<QString>
{
};

pqCustomFilterManagerModel::pqCustomFilterManagerModel(QObject* parentObject)
  : QAbstractListModel(parentObject)
{
  this->Internal = new pqCustomFilterManagerModelInternal();
}

pqCustomFilterManagerModel::~pqCustomFilterManagerModel()
{
  this->exportCustomFiltersToSettings();

  delete this->Internal;
}

int pqCustomFilterManagerModel::rowCount(const QModelIndex& parentIndex) const
{
  if (this->Internal && !parentIndex.isValid())
  {
    return this->Internal->size();
  }

  return 0;
}

QModelIndex pqCustomFilterManagerModel::index(
  int row, int column, const QModelIndex& parentIndex) const
{
  if (this->Internal && !parentIndex.isValid() && column == 0 && row >= 0 &&
    row < this->Internal->size())
  {
    return this->createIndex(row, column);
  }

  return QModelIndex();
}

QVariant pqCustomFilterManagerModel::data(const QModelIndex& idx, int role) const
{
  if (this->Internal && idx.isValid() && idx.model() == this)
  {
    switch (role)
    {
      case Qt::DisplayRole:
      case Qt::ToolTipRole:
      case Qt::EditRole:
      {
        return QVariant((*this->Internal)[idx.row()]);
      }
      case Qt::DecorationRole:
      {
        return QVariant(QPixmap(":/pqWidgets/Icons/pqBundle16.png"));
      }
    }
  }

  return QVariant();
}

Qt::ItemFlags pqCustomFilterManagerModel::flags(const QModelIndex&) const
{
  return Qt::ItemIsSelectable | Qt::ItemIsEnabled;
}

QString pqCustomFilterManagerModel::getCustomFilterName(const QModelIndex& idx) const
{
  if (this->Internal && idx.isValid() && idx.model() == this)
  {
    return (*this->Internal)[idx.row()];
  }

  return QString();
}

QModelIndex pqCustomFilterManagerModel::getIndexFor(const QString& filter) const
{
  if (this->Internal && !filter.isEmpty())
  {
    int row = this->Internal->indexOf(filter);
    if (row != -1)
    {
      return this->createIndex(row, 0);
    }
  }

  return QModelIndex();
}

void pqCustomFilterManagerModel::addCustomFilter(QString name)
{
  if (!this->Internal || name.isEmpty())
  {
    return;
  }

  // Make sure the name is new.
  if (this->Internal->contains(name))
  {
    // qDebug() << "Duplicate custom proxy definition added.";
    return;
  }

  // Insert the custom filter in alphabetical order.
  int row = 0;
  for (; row < this->Internal->size(); row++)
  {
    if (QString::compare(name, (*this->Internal)[row]) < 0)
    {
      break;
    }
  }

  this->beginInsertRows(QModelIndex(), row, row);
  this->Internal->insert(row, name);
  this->endInsertRows();

  emit this->customFilterAdded(name);
}

void pqCustomFilterManagerModel::removeCustomFilter(QString name)
{
  if (!this->Internal || name.isEmpty())
  {
    return;
  }

  // Find the row for the custom filter.
  int row = this->Internal->indexOf(name);
  if (row == -1)
  {
    qDebug() << "Custom proxy definition not found in the model.";
    return;
  }

  // Notify the view that the index is going away.
  this->beginRemoveRows(QModelIndex(), row, row);
  this->Internal->removeAt(row);
  this->endRemoveRows();
}

void pqCustomFilterManagerModel::importCustomFiltersFromSettings()
{
  vtkSMSessionProxyManager* proxyManager =
    vtkSMProxyManager::GetProxyManager()->GetActiveSessionProxyManager();
  pqSettings* settings = pqApplicationCore::instance()->settings();

  QString key = "CustomFilters";
  if (!settings->contains(key))
  {
    return;
  }

  QString state = settings->value(key).toString();

  if (state.isNull())
  {
    return;
  }

  vtkPVXMLParser* parser = vtkPVXMLParser::New();
  parser->Parse(state.toLocal8Bit().data());

  proxyManager->LoadCustomProxyDefinitions(parser->GetRootElement());

  parser->Delete();
}

void pqCustomFilterManagerModel::exportCustomFiltersToSettings()
{
  // Store the custom filters for a subsequent ParaView session
  vtkSMSessionProxyManager* proxyManager =
    vtkSMProxyManager::GetProxyManager()->GetActiveSessionProxyManager();

  if (!proxyManager)
  {
    // No active session
    return;
  }

  vtkPVXMLElement* root = vtkPVXMLElement::New();
  root->SetName("CustomFilterDefinitions");
  proxyManager->SaveCustomProxyDefinitions(root);

  std::ostringstream os;
  root->PrintXML(os, vtkIndent(0));
  QString state = os.str().c_str();
  root->Delete();

  pqApplicationCore::instance()->settings()->setValue("CustomFilters", state);
}
