/***************************************************************************
    qgsbrowsermodel.h
    ---------------------
    begin                : July 2011
    copyright            : (C) 2011 by Martin Dobias
    email                : wonder.sk at gmail.com
 ***************************************************************************
 *                                                                         *
 *   This program 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 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSBROWSERMODEL_H
#define QGSBROWSERMODEL_H

#include <QAbstractItemModel>
#include <QIcon>
#include <QMimeData>

#include "qgsdataitem.h"

class CORE_EXPORT QgsBrowserModel : public QAbstractItemModel
{
    Q_OBJECT

  public:
    explicit QgsBrowserModel( QObject *parent = 0 );
    ~QgsBrowserModel();

    // implemented methods from QAbstractItemModel for read-only access

    /** Used by other components to obtain information about each item provided by the model.
      In many models, the combination of flags should include Qt::ItemIsEnabled and Qt::ItemIsSelectable. */
    virtual Qt::ItemFlags flags( const QModelIndex &index ) const;

    /** Used to supply item data to views and delegates. Generally, models only need to supply data
      for Qt::DisplayRole and any application-specific user roles, but it is also good practice
      to provide data for Qt::ToolTipRole, Qt::AccessibleTextRole, and Qt::AccessibleDescriptionRole.
      See the Qt::ItemDataRole enum documentation for information about the types associated with each role. */
    virtual QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const;

    /** Provides views with information to show in their headers. The information is only retrieved
      by views that can display header information. */
    virtual QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const;

    /** Provides the number of rows of data exposed by the model. */
    virtual int rowCount( const QModelIndex &parent = QModelIndex() ) const;

    /** Provides the number of columns of data exposed by the model. List models do not provide this function
      because it is already implemented in QAbstractListModel. */
    virtual int columnCount( const QModelIndex &parent = QModelIndex() ) const;

    /** Returns the index of the item in the model specified by the given row, column and parent index. */
    virtual QModelIndex index( int row, int column, const QModelIndex & parent = QModelIndex() ) const;

    QModelIndex findItem( QgsDataItem *item, QgsDataItem *parent = 0 ) const;

    /** Returns the parent of the model item with the given index.
     * If the item has no parent, an invalid QModelIndex is returned.
     */
    virtual QModelIndex parent( const QModelIndex &index ) const;

    /** Returns a list of mime that can describe model indexes */
    virtual QStringList mimeTypes() const;

    /** Returns an object that contains serialized items of data corresponding to the list of indexes specified */
    virtual QMimeData * mimeData( const QModelIndexList &indexes ) const;

    /** Handles the data supplied by a drag and drop operation that ended with the given action */
    virtual bool dropMimeData( const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent );

    QgsDataItem *dataItem( const QModelIndex &idx ) const;

    bool hasChildren( const QModelIndex &parent = QModelIndex() ) const;

    // Reload the whole model
    void reload();

    // Refresh item specified by path
    void refresh( QString path );

    // Refresh item childs
    void refresh( const QModelIndex &index = QModelIndex() );

    //! return index of a path
    QModelIndex findPath( QString path );

    void connectItem( QgsDataItem *item );

  signals:

  public slots:
    //void removeItems( QgsDataItem * parent, QVector<QgsDataItem *>items );
    //void addItems( QgsDataItem * parent, QVector<QgsDataItem *>items );
    //void refreshItems( QgsDataItem * parent, QVector<QgsDataItem *>items );

    void beginInsertItems( QgsDataItem *parent, int first, int last );
    void endInsertItems();
    void beginRemoveItems( QgsDataItem *parent, int first, int last );
    void endRemoveItems();

  protected:

    // populates the model
    void addRootItems();
    void removeRootItems();

    QVector<QgsDataItem*> mRootItems;
};

#endif // QGSBROWSERMODEL_H
