/***************************************************************************
 *   Copyright (C) 2009 by Joris Guisson                                   *
 *   joris.guisson@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 BT_MAGNETDOWNLOADER_H
#define BT_MAGNETDOWNLOADER_H

#include <QObject>
#include <kio/job.h>
#include <ktorrent_export.h>
#include <torrent/torrent.h>
#include <tracker/tracker.h>
#include "magnetlink.h"

namespace dht
{
class DHTPeerSource;
}

namespace bt
{
class Peer;
class PeerManager;

/**
    Class which tries to download the metadata associated to a MagnetLink
    It basically has a Tracker (optional), a DHTPeerSource and a PeerManager.
    With these it tries to find peers, connect to them and download the metadata.
*/
class KTORRENT_EXPORT MagnetDownloader : public QObject, public TrackerDataSource
{
    Q_OBJECT
public:
    MagnetDownloader(const MagnetLink & mlink, QObject* parent);
    ~MagnetDownloader() override;

    /**
        Update the MagnetDownloader
    */
    void update();

    /// Is the magnet download running
    bool running() const;

    /// How many peers are we connected to
    Uint32 numPeers() const;

    /// Get the MagnetLink
    const MagnetLink & magnetLink() const
    {
        return mlink;
    }

    /**
    Start the MagnetDownloader, this will enable DHT.
    */
    void start();

    /**
    Stop the MagnetDownloader
    */
    void stop();

Q_SIGNALS:
    /**
        Emitted when downloading the metadata was succesfull.
    */
    void foundMetadata(bt::MagnetDownloader* self, const QByteArray & metadata);

private:
    void onNewPeer(Peer* p);
    void onMetadataDownloaded(const QByteArray & data);
    void onTorrentDownloaded(KJob*);
    void dhtStarted();
    void dhtStopped();

    Uint64 bytesDownloaded() const override;
    Uint64 bytesUploaded() const override;
    Uint64 bytesLeft() const override;
    const SHA1Hash & infoHash() const override;
    bool isPartialSeed() const override;

    MagnetLink mlink;
    QList<Tracker*> trackers;
    PeerManager* pman;
    dht::DHTPeerSource* dht_ps;
    QByteArray metadata;
    Torrent tor;
    bool found;
};

}

#endif // BT_MAGNETDOWNLOADER_H
