/***************************************************************************
 *   Copyright (C) 2007 by Joris Guisson and Ivan Vasic                    *
 *   joris.guisson@gmail.com                                               *
 *   ivasic@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.                                   *
 *                                                                         *
 *   This program 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 this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.          *
 ***************************************************************************/
#ifndef KTTORRENTFILETREEMODEL_H
#define KTTORRENTFILETREEMODEL_H

#include "torrentfilemodel.h"
#include <util/bitset.h>

class QSortFilterProxyModel;

namespace bt
{
	class BEncoder;
	class BNode;
}

namespace kt
{

	/**
	 * Model for displaying file trees of a torrent
	 * @author Joris Guisson
	*/
	class KTCORE_EXPORT TorrentFileTreeModel : public TorrentFileModel
	{
		Q_OBJECT
	protected:
		struct KTCORE_EXPORT Node
		{
			Node* parent;
			bt::TorrentFileInterface* file; // file (0 if this is a directory)
			QString name; // name or directory
			QList<Node*> children; // child dirs
			bt::Uint64 size;
			bt::BitSet chunks;
			bool chunks_set;
			float percentage;
		
			Node(Node* parent,bt::TorrentFileInterface* file,const QString & name,
				bt::Uint32 total_chunks);
			Node(Node* parent,const QString & name, bt::Uint32 total_chunks);
			~Node();
		
			void insert(const QString & path,bt::TorrentFileInterface* file, bt::Uint32 num_chunks);
			int row();
			bt::Uint64 fileSize(const bt::TorrentInterface* tc);
			bt::Uint64 bytesToDownload(const bt::TorrentInterface* tc);
			Qt::CheckState checkState(const bt::TorrentInterface* tc) const;
			QString path();
			void fillChunks();
			void updatePercentage(const bt::BitSet & havechunks);
			void initPercentage(const bt::TorrentInterface* tc,const bt::BitSet & havechunks);
		
			void saveExpandedState(const QModelIndex & index,QSortFilterProxyModel* pm,QTreeView* tv,bt::BEncoder* enc);
			void loadExpandedState(const QModelIndex & index,QSortFilterProxyModel* pm,QTreeView* tv,bt::BNode* node);
		};
	public:
		TorrentFileTreeModel(bt::TorrentInterface* tc,DeselectMode mode,QObject* parent);
		virtual ~TorrentFileTreeModel();
		
		virtual void changeTorrent(bt::TorrentInterface* tc);
		virtual int rowCount(const QModelIndex & parent) const;
		virtual int columnCount(const QModelIndex & parent) const;
		virtual QVariant headerData(int section, Qt::Orientation orientation,int role) const;
		virtual QVariant data(const QModelIndex & index, int role) const;
		virtual QModelIndex parent(const QModelIndex & index) const;
		virtual QModelIndex index(int row,int column,const QModelIndex & parent) const;
		virtual bool setData(const QModelIndex & index, const QVariant & value, int role);
		virtual void checkAll();
		virtual void uncheckAll();
		virtual void invertCheck();
		virtual bt::Uint64 bytesToDownload();
		virtual QByteArray saveExpandedState(QSortFilterProxyModel* pm,QTreeView* tv);
		virtual void loadExpandedState(QSortFilterProxyModel* pm,QTreeView* tv,const QByteArray & state);
		virtual bt::TorrentFileInterface* indexToFile(const QModelIndex & idx);
		virtual QString dirPath(const QModelIndex & idx);
		virtual void changePriority(const QModelIndexList & indexes,bt::Priority newpriority);
		virtual void onCodecChange();
	private: 
		void constructTree();
		void invertCheck(const QModelIndex & idx);
		bool setCheckState(const QModelIndex & index, Qt::CheckState state);
		bool setName(const QModelIndex & index,const QString & name);
		void modifyPathOfFiles(Node* n,const QString & path);

	
	protected:
		Node* root;
		bool emit_check_state_change;
	};

}

#endif
