/*
 * PlaylistManager.h
 *****************************************************************************
 * Copyright © 2010 - 2011 Klagenfurt University
 *             2015 VideoLAN and VLC Authors
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser 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 PLAYLISTMANAGER_H_
#define PLAYLISTMANAGER_H_

#include "logic/AbstractAdaptationLogic.h"
#include "tools/Macros.hpp"
#include "Streams.hpp"
#include <vector>

#include <vlc_threads.h>
#include <vlc_cxx_helpers.hpp>

namespace adaptive
{
    namespace playlist
    {
        class BasePlaylist;
        class BasePeriod;
    }

    namespace http
    {
        class AbstractConnectionManager;
    }

    using namespace playlist;
    using namespace logic;

    using StreamPosition = AbstractStream::StreamPosition;

    class PlaylistManager
    {
        PREREQ_VIRTUAL(PlaylistManager);

        public:
            PlaylistManager( demux_t *,
                             SharedResources *,
                             BasePlaylist *,
                             AbstractStreamFactory *,
                             AbstractAdaptationLogic::LogicType type );
            virtual ~PlaylistManager    ();

            bool    init(bool = false);
            bool    start();
            bool    started() const;
            void    stop();

            AbstractStream::BufferingStatus bufferize(Times, vlc_tick_t,
                                                      vlc_tick_t, vlc_tick_t);
            AbstractStream::Status dequeue(Times, Times *);

            virtual bool needsUpdate() const;
            virtual bool updatePlaylist();
            virtual void scheduleNextUpdate();
            virtual void preparsePlaylist();

            /* static callbacks */
            static int control_callback(demux_t *, int, va_list);
            static int demux_callback(demux_t *);

        protected:
            /* Demux calls */
            virtual int doControl(int, va_list);
            virtual int doDemux(vlc_tick_t);

            void    setLivePause(bool);
            virtual bool setPosition(vlc_tick_t, double pos = -1, bool accurate = false);
            StreamPosition getResumePosition() const;
            Times getFirstTimes() const;
            unsigned getActiveStreamsCount() const;

            Times getTimes(bool = false) const;
            vlc_tick_t getMinAheadTime() const;
            bool isBufferingSufficient(Times, vlc_tick_t) const;

            virtual bool reactivateStream(AbstractStream *);
            bool setupPeriod();
            void unsetPeriod();

            void updateControlsPosition();

            /* local factories */
            virtual AbstractAdaptationLogic *createLogic(AbstractAdaptationLogic::LogicType,
                                                         AbstractConnectionManager *);
            virtual AbstractBufferingLogic *createBufferingLogic() const;

            SharedResources                     *resources;
            AbstractAdaptationLogic::LogicType  logicType;
            AbstractAdaptationLogic             *logic;
            AbstractBufferingLogic              *bufferingLogic;
            BasePlaylist                    *playlist;
            AbstractStreamFactory               *streamFactory;
            demux_t                             *p_demux;
            std::vector<AbstractStream *>        streams;
            BasePeriod                          *currentPeriod;
            bool                                 b_preparsing;

            enum class TimestampSynchronizationPoint
            {
                RandomAccess,
                Discontinuity,
            };

            /* shared with demux/buffering */
            struct
            {
                TimestampSynchronizationPoint pcr_syncpoint;
                Times times, firsttimes;
                bool rebuffering;
                mutable vlc_mutex_t lock;
                vlc_cond_t  cond;
            } demux;

            /* buffering process */
            time_t                               nextPlaylistupdate;
            int                                  failedupdates;

            /* Controls */
            struct
            {
                bool        b_live;
                vlc_tick_t  i_time;
                vlc_tick_t  i_normaltime;
                double      f_position;
                mutable vlc_mutex_t lock;
                vlc_tick_t  playlistStart;
                vlc_tick_t  playlistEnd;
                vlc_tick_t  playlistLength;
                time_t      lastupdate;
            } cached;

            SynchronizationReferences synchronizationReferences;

        private:
            void setBufferingRunState(bool);
            void Run();
            static void * managerThread(void *);
            vlc::threads::mutex  lock;
            vlc::threads::condition_variable waitcond;
            vlc_thread_t thread;
            bool         b_thread;
            bool         b_buffering;
            bool         b_canceled;
            vlc_tick_t   pause_start;
    };

}

#endif /* PLAYLISTMANAGER_H_ */