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

   Program: ParaView
   Module:    pqPipelineModel.h

   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.
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=========================================================================*/

/// \file pqPipelineModel.h
/// \date 4/14/2006

#ifndef _pqPipelineModel_h
#define _pqPipelineModel_h


#include "pqComponentsModule.h"
#include <QAbstractItemModel>
#include <QPointer>
#include "pqView.h"

class pqDataRepresentation;
class pqPipelineModelFilter;
class pqPipelineModelInternal;
class pqPipelineModelItem;
class pqPipelineModelOutput;
class pqPipelineModelSource;
class pqPipelineSource;
class pqView;
class pqServer;
class pqServerManagerModel;
class pqServerManagerModelItem;
class QFont;
class QPixmap;


/// \class pqPipelineModel
/// \brief
///   The pqPipelineModel class is used to represent the pipeline graph
///   as a tree.
///
/// The top of the hierarchy is the server objects. Each connected
/// server is added to the root node. An object with no inputs is added
/// as a child of its server. The outputs of an object are added as its
/// children. Objects with multiple inputs present a problem.
///
/// Instead of repeating information in the tree, the object with
/// multiple inputs is moved to the server. All its outputs are treated
/// normally and added as children. In place of the object with more
/// than one input, a link object is placed in the child list of the
/// input objects. The link item represents a connection instead of a
/// pipeline object.

class pqPipelineModelInternal;
class pqServerManagerModelItem;
class pqPipelineSource;
class pqServer;
class QPixmap;
class QString;
class pqPipelineModelDataItem;
class vtkSession;

/// This class is the model for the PipelineLine browser tree view.
/// pqServerManagerModel models the vtkSMProxyManager for the GUI. The 
/// vtkSMProxyManager maintains all proxies and hence it is difficult 
/// to detect/trasvers pipelines etc etc. The pqServerManagerModel
/// provides a simplified view of the Server Manager. This class
/// takes that simplified "model" and transforms it into hierarchical
/// tables which can be represented by the Tree View.
class PQCOMPONENTS_EXPORT pqPipelineModel : public QAbstractItemModel
{
  Q_OBJECT;

public:
  enum ItemType {
    Invalid = -1,
    Server = 0,
    Proxy,
    Port,
    Link
  };

  enum ItemRole {
    AnnotationFilterRole = 33,
    SessionFilterRole = 34
    };

public:
  pqPipelineModel(QObject *parent=0);

  /// \brief
  ///   Makes a copy of a pipeline model.
  /// \param other The pipeline model to copy.
  /// \param parent The parent object.
  pqPipelineModel(const pqPipelineModel &other, QObject *parent=0);

  /// \brief
  ///   Creates a pipeline model from a server manager model.
  /// \param other Used to build a pipeline model.
  /// \param parent The parent object.
  pqPipelineModel(const pqServerManagerModel &other, QObject *parent=0);

  virtual ~pqPipelineModel();

  /// \name QAbstractItemModel Methods
  //@{
  /// \brief
  ///   Gets the number of rows for a given index.
  /// \param parent The parent index.
  /// \return
  ///   The number of rows for the given index.
  virtual int rowCount(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets the number of columns for a given index.
  /// \param parent The parent index.
  /// \return
  ///   The number of columns for the given index.
  virtual int columnCount(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets whether or not the given index has child items.
  /// \param parent The parent index.
  /// \return
  ///   True if the given index has child items.
  virtual bool hasChildren(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets a model index for a given location.
  /// \param row The row number.
  /// \param column The column number.
  /// \param parent The parent index.
  /// \return
  ///   A model index for the given location.
  virtual QModelIndex index(int row, int column,
      const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets the parent for a given index.
  /// \param index The model index.
  /// \return
  ///   A model index for the parent of the given index.
  virtual QModelIndex parent(const QModelIndex &index) const;

  /// \brief
  ///   Gets the data for a given model index.
  /// \param index The model index.
  /// \param role The role to get data for.
  /// \return
  ///   The data for the given model index.
  virtual QVariant data(const QModelIndex &index,
      int role=Qt::DisplayRole) const;

  /// \brief
  ///  Sets the role data for the item at index to value. Returns 
  ///  true if successful; otherwise returns false.
  bool setData(const QModelIndex &index, const QVariant& value, 
    int role = Qt::EditRole);

  /// \brief
  ///   Gets the flags for a given model index.
  ///
  /// The flags for an item indicate if it is enabled, editable, etc.
  ///
  /// \param index The model index.
  /// \return
  ///   The flags for the given model index.
  virtual Qt::ItemFlags flags(const QModelIndex &index) const;
  //@}

  /// \name Object Mapping
  //@{

  /// Given the index, get the pqServerManagerModelItem it represents.
  /// NULL is returned for root or invalid index.
  pqServerManagerModelItem* getItemFor(const QModelIndex& ) const;


  QModelIndex getIndexFor(pqServerManagerModelItem *item) const;

  /// \brief
  ///   Gets the type for the given index.
  /// \param index The model index to look up.
  /// \return
  ///   The type for the given index.
  ItemType getTypeFor(const QModelIndex &index) const;
  //@}

   /// \brief
  ///   Gets whether or not the model indexes are editable.
  /// \return
  ///   True if the model indexes can be edited.
  bool isEditable() const {return this->Editable;}

  /// \brief
  ///   Sets whether or not the model indexes are editable.
  /// \param editable True if the model indexes can be edited.
  void setEditable(bool editable) {this->Editable = editable;}

  /// \brief
  ///   Sets whether or not the given index is selectable.
  /// \param index The model index.
  /// \param selectable True if the index can be selected.
  void setSelectable(const QModelIndex &index, bool selectable);

  /// \brief
  ///   Gets whether or not the given index is selectable.
  /// \param index The model index.
  /// \return
  ///   True if the given index is selectable.
  bool isSelectable(const QModelIndex &index) const;

  /// \brief
  ///   Sets whether of not an item subtree is selectable.
  /// \param item The root of the subtree.
  /// \param selectable True if the items can be selected.
  void setSubtreeSelectable(pqServerManagerModelItem *item, bool selectable);

  /// \brief
  ///   Gets the next model index in the tree.
  /// \param index The current index.
  /// \param root An alternate root for walking a subtree.
  /// \return
  ///   An index to the next item in the tree or an invalid index
  ///   when the end of the tree is reached.
  QModelIndex getNextIndex(const QModelIndex index,
      const QModelIndex &root=QModelIndex()) const;

  /// Provides access to the view.
  pqView* view() const
    { return this->View; }

  /// \brief
  ///   Sets the font hint for modified items.
  /// \param font The font to use for modified items.
  void setModifiedFont(const QFont &font);

  /// \brief
  ///   Store the annotation key that will be used when
  ///   "this->data( ... , pqPipelineMode::AnnotationFilterRole)"
  ///   get called.
  /// \param annotation key that will be lookup inside the above code.
  void enableFilterAnnotationKey(const QString &expectedAnnotation);

  /// \brief
  ///   Disable annotation key, so
  ///   "this->data( ... , pqPipelineMode::AnnotationFilterRole)"
  ///   will always return a QVariant("true")
  void disableFilterAnnotationKey();

  /// \brief
  ///   Store the session key that will be used when
  ///   "this->data( ... , pqPipelineMode::SessionFilterRole)"
  ///   get called.
  /// \param session that will be lookup inside the above code.
  void enableFilterSession(vtkSession* session);

  /// \brief
  ///   Disable annotation key, so
  ///   "this->data( ... , pqPipelineMode::SessionFilterRole)"
  ///   will always return a QVariant("true")
  void disableFilterSession();

public slots:
  /// Called when a new server connection is detected. Adds the connection to the
  /// list.
  void addServer(pqServer *server);

  /// Called when a server connection is closed. Removes the server from the list.
  void removeServer(pqServer *server);

  /// Called when a new source/filter/bundle is registered.
  void addSource(pqPipelineSource* source);

  /// Called when a new source/filter/bundle is unregistred.
  void removeSource(pqPipelineSource* source);

  /// Called when new pipeline connection (between two pipeline objects)
  /// is made.
  void addConnection(pqPipelineSource *source, pqPipelineSource *sink, int);

  /// Called when new pipeline connection (between two pipeline objects)
  /// is broken.
  void removeConnection(pqPipelineSource *source, pqPipelineSource *sink, int);

  /// Updates the icons in the current window column.
  /// The current window column shows whether or not the source is
  /// displayed in the current window. When the current window changes
  /// the entire column needs to be updated.
  void setView(pqView *module);

signals:
  void firstChildAdded(const QModelIndex &index);

private slots:
  void serverDataChanged();

  /// called when visibility of the source may have changed.
  void updateVisibility(pqPipelineSource*);

  /// called when the item's name changes.
  void updateData(pqServerManagerModelItem*);

private:
  friend class pqPipelineModelDataItem;

  // Add an item as a child under the parent at the given index.
  // Note that this method does not actually change the underlying
  // pqServerManagerModel, it merely signals that such an addition
  // has taken place.
  void addChild(pqPipelineModelDataItem* parent, 
    pqPipelineModelDataItem* child);

  // Remove a child item from under the parent.
  // Note that this method does not actually change the underlying
  // pqServerManagerModel, it merely signals that such an addition
  // has taken place.
  void removeChildFromParent(pqPipelineModelDataItem* child);

  // Returns the pqPipelineModelDataItem for the given pqServerManagerModelItem.
  pqPipelineModelDataItem* getDataItem(pqServerManagerModelItem* item,
    pqPipelineModelDataItem* subtreeRoot,
    ItemType type=Invalid) const;

  // called by pqPipelineModelDataItem to indicate that the data for the item
  // may have changed.
  void itemDataChanged(pqPipelineModelDataItem*);
  
  
  /// used by the variant of setSubtreeSelectable() for recursion.
  void setSubtreeSelectable(pqPipelineModelDataItem *item, bool selectable);

  QModelIndex getIndex(pqPipelineModelDataItem* item) const;
private:
  pqPipelineModelInternal *Internal; ///< Stores the pipeline representation.
  QPixmap *PixmapList;               ///< Stores the item icons.
  QPointer<pqView> View;
  bool Editable;
  QString FilterRoleAnnotationKey;
  vtkSession* FilterRoleSession;
  void constructor();
};

#endif
