/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/

#ifndef QCMakeCacheView_h
#define QCMakeCacheView_h

#include "QCMake.h"
#include <QTreeView>
#include <QSet>
#include <QStandardItemModel>
#include <QItemDelegate>

class QSortFilterProxyModel;
class QCMakeCacheModel;
class QCMakeAdvancedFilter;

/// Qt view class for cache properties
class QCMakeCacheView : public QTreeView
{
  Q_OBJECT
public:
  QCMakeCacheView(QWidget* p);

  // retrieve the QCMakeCacheModel storing all the pointers
  // this isn't necessarily the model one would get from model()
  QCMakeCacheModel* cacheModel() const;
  
  // get whether to show advanced entries
  bool showAdvanced() const;

  QSize sizeHint() const { return QSize(200,200); }

public slots:
  // set whether to show advanced entries
  void setShowAdvanced(bool);
  // set the search filter string.  any property key or value not matching will
  // be filtered out
  void setSearchFilter(const QString&);

protected:
  QModelIndex moveCursor(CursorAction, Qt::KeyboardModifiers);
  bool event(QEvent* e);
  QCMakeCacheModel* CacheModel;
  QCMakeAdvancedFilter* AdvancedFilter;
  QSortFilterProxyModel* SearchFilter;
};

/// Qt model class for cache properties
class QCMakeCacheModel : public QStandardItemModel
{
  Q_OBJECT
public:
  QCMakeCacheModel(QObject* parent);
  ~QCMakeCacheModel();

  // roles used to retrieve extra data such has help strings, types of
  // properties, and the advanced flag
  enum { HelpRole = Qt::ToolTipRole,
         TypeRole = Qt::UserRole, 
         AdvancedRole,
         StringsRole};

  enum ViewType { FlatView, GroupView };

public slots:
  // set a list of properties.  This list will be sorted and grouped according
  // to prefix.  Any property that existed already and which is found in this
  // list of properties to set will become an old property.  All others will
  // become new properties and be marked red.
  void setProperties(const QCMakePropertyList& props);

  // clear everything from the model
  void clear();

  // set flag whether the model can currently be edited.
  void setEditEnabled(bool);

  // insert a new property at a row specifying all the information about the
  // property
  bool insertProperty(QCMakeProperty::PropertyType t,
                      const QString& name, const QString& description,
                      const QVariant& value, bool advanced);

  // set the view type
  void setViewType(ViewType t);
  ViewType viewType() const;

public:
  // get the properties
  QCMakePropertyList properties() const;
  
  // editing enabled
  bool editEnabled() const;

  // returns how many new properties there are
  int newPropertyCount() const;

  // return flags (overloaded to modify flag based on EditEnabled flag)
  Qt::ItemFlags flags (const QModelIndex& index) const;
  QModelIndex buddy(const QModelIndex& idx) const;
  
  // get the data in the model for this property
  void getPropertyData(const QModelIndex& idx1,
                       QCMakeProperty& prop) const;

protected:
  bool EditEnabled;
  int NewPropertyCount;
  ViewType View;

  // set the data in the model for this property
  void setPropertyData(const QModelIndex& idx1, 
                       const QCMakeProperty& p, bool isNew);

  // breaks up he property list into groups
  // where each group has the same prefix up to the first underscore
  static void breakProperties(const QSet<QCMakeProperty>& props,
                       QMap<QString, QCMakePropertyList>& result);
  
  // gets the prefix of a string up to the first _
  static QString prefix(const QString& s);

};

/// Qt delegate class for interaction (or other customization) 
/// with cache properties
class QCMakeCacheModelDelegate : public QItemDelegate
{
  Q_OBJECT
public:
  QCMakeCacheModelDelegate(QObject* p);
  /// create our own editors for cache properties
  QWidget* createEditor(QWidget* parent, const QStyleOptionViewItem& option, 
      const QModelIndex& index ) const;
  bool editorEvent (QEvent* event, QAbstractItemModel* model, 
       const QStyleOptionViewItem& option, const QModelIndex& index);
  bool eventFilter(QObject* object, QEvent* event);
  void setModelData(QWidget * editor, QAbstractItemModel * model, const QModelIndex & index ) const;
  QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const;

  QSet<QCMakeProperty> changes() const;
  void clearChanges();

protected slots:
  void setFileDialogFlag(bool);
protected:
  bool FileDialogFlag;
  // record a change to an item in the model.
  // this simply saves the item in the set of changes
  void recordChange(QAbstractItemModel* model, const QModelIndex& index);

  // properties changed by user via this delegate
  QSet<QCMakeProperty> mChanges;
};

#endif