/*
 * This file Copyright (C) 2009 Charles Kerr <charles@transmissionbt.com>
 *
 * This file is licensed by the GPL version 2.  Works owned by the
 * Transmission project are granted a special exemption to clause 2(b)
 * so that the bulk of its code can remain under the MIT license.
 * This exemption does not extend to derived works not owned by
 * the Transmission project.
 *
 * $Id:$
 */

#ifndef TR_APP_SESSION_H
#define TR_APP_SESSION_H

#include <QObject>
#include <QSet>
#include <QBuffer>
#include <QFileInfoList>
#include <QString>
#include <QHttp>
#include <QUrl>

#include <libtransmission/transmission.h>

#include "speed.h"

extern "C"
{
    struct tr_benc;
}

class Prefs;

class Session: public QObject
{
        Q_OBJECT

    public:
        Session( const char * configDir, Prefs& prefs );
        ~Session( );

        static const int ADD_TORRENT_TAG;

    public:
        void stop( );
        void restart( );

    private:
        void start( );

    public:
        const QUrl& getRemoteUrl( ) const { return myUrl; }
        const struct tr_session_stats& getStats( ) const { return myStats; }
        const struct tr_session_stats& getCumulativeStats( ) const { return myCumulativeStats; }
        const QString& sessionVersion( ) const { return mySessionVersion; }

    public:
        int64_t blocklistSize( ) const { return myBlocklistSize; }
        void setBlocklistSize( int64_t i );
        void updateBlocklist( );
        void portTest( );

    public:

        /** returns true if the transmission session is being run inside this client */
        bool isServer( ) const;

        /** returns true if isServer() is true or if the remote address is the localhost */
        bool isLocal( ) const;

    private:
        void updateStats( struct tr_benc * args );
        void updateInfo( struct tr_benc * args );
        void parseResponse( const char * json, size_t len );
        static void localSessionCallback( tr_session *, const char *, size_t, void * );

    public:
        void exec( const char * request );
        void exec( const struct tr_benc * request );

    private:
        void sessionSet( const char * key, const QVariant& variant );
        void pumpRequests( );
        void sendTorrentRequest( const char * request, const QSet<int>& torrentIds );
        static void updateStats( struct tr_benc * d, struct tr_session_stats * stats );
        void refreshTorrents( const QSet<int>& torrentIds );

    public:
        void torrentSet( const QSet<int>& ids, const QString& key, bool val );
        void torrentSet( const QSet<int>& ids, const QString& key, int val );
        void torrentSet( const QSet<int>& ids, const QString& key, double val );
        void torrentSet( const QSet<int>& ids, const QString& key, const QList<int>& val );
        void torrentSetLocation( const QSet<int>& ids, const QString& path, bool doMove );


    public slots:
        void pauseTorrents( const QSet<int>& torrentIds = QSet<int>() );
        void startTorrents( const QSet<int>& torrentIds = QSet<int>() );
        void refreshSessionInfo( );
        void refreshSessionStats( );
        void refreshActiveTorrents( );
        void refreshAllTorrents( );
        void initTorrents( const QSet<int>& ids = QSet<int>() );
        void addTorrent( QString filename );
        void removeTorrents( const QSet<int>& torrentIds, bool deleteFiles=false );
        void verifyTorrents( const QSet<int>& torrentIds );
        void reannounceTorrents( const QSet<int>& torrentIds );
        void launchWebInterface( );
        void updatePref( int key );

        /** request a refresh for statistics, including the ones only used by the properties dialog, for a specific torrent */
        void refreshExtraStats( const QSet<int>& ids );

    private slots:
        void onRequestStarted( int id );
        void onRequestFinished( int id, bool error );

    signals:
        void sourceChanged( );
        void portTested( bool isOpen );
        void statsUpdated( );
        void sessionUpdated( );
        void blocklistUpdated( int );
        void torrentsUpdated( struct tr_benc * torrentList, bool completeList );
        void torrentsRemoved( struct tr_benc * torrentList );
        void dataReadProgress( );
        void dataSendProgress( );
        void httpAuthenticationRequired( );

    private:
        int64_t myBlocklistSize;
        Prefs& myPrefs;
        tr_session * mySession;
        QString myConfigDir;
        QString mySessionId;
        QUrl myUrl;
        QBuffer myBuffer;
        QHttp myHttp;
        struct tr_session_stats myStats;
        struct tr_session_stats myCumulativeStats;
        QString mySessionVersion;
};

#endif