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    Copyright (C) 2000 Paul Davis 

    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
    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., 675 Mass Ave, Cambridge, MA 02139, USA.


#ifndef __ardour_playlist_h__
#define __ardour_playlist_h__

#include <string>
#include <set>
#include <map>
#include <list>
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>

#include <sys/stat.h>

#include <glib.h>

#include <sigc++/signal.h>

#include <pbd/undo.h>
#include <pbd/stateful.h> 
#include <pbd/statefuldestructible.h> 

#include <ardour/ardour.h>
#include <ardour/crossfade_compare.h>
#include <ardour/location.h>

namespace ARDOUR  {

class Session;
class Region;

class Playlist : public PBD::StatefulDestructible, public boost::enable_shared_from_this<Playlist> {
      typedef list<boost::shared_ptr<Region> >    RegionList;

      Playlist (Session&, const XMLNode&, bool hidden = false);
      Playlist (Session&, string name, bool hidden = false);
      Playlist (boost::shared_ptr<const Playlist>, string name, bool hidden = false);
      Playlist (boost::shared_ptr<const Playlist>, nframes_t start, nframes_t cnt, string name, bool hidden = false);

      virtual ~Playlist ();  

      void set_region_ownership ();

      virtual void clear (bool with_signals=true);
      virtual void dump () const;

      void use();
      void release();
      bool used () const { return _refcnt != 0; }

      std::string name() const { return _name; }
      void set_name (std::string str);
      int sort_id() { return _sort_id; }

      bool frozen() const { return _frozen; }
      void set_frozen (bool yn);

      bool hidden() const { return _hidden; }
      bool empty() const;
      uint32_t n_regions() const;
      nframes_t get_maximum_extent () const;
      layer_t top_layer() const;

      EditMode get_edit_mode() const { return _edit_mode; }
      void set_edit_mode (EditMode);

      /* Editing operations */

      void add_region (boost::shared_ptr<Region>, nframes_t position, float times = 1);
      void remove_region (boost::shared_ptr<Region>);
      void get_equivalent_regions (boost::shared_ptr<Region>, std::vector<boost::shared_ptr<Region> >&);
      void get_region_list_equivalent_regions (boost::shared_ptr<Region>, std::vector<boost::shared_ptr<Region> >&);
      void replace_region (boost::shared_ptr<Region> old, boost::shared_ptr<Region> newr, nframes_t pos);
      void split_region (boost::shared_ptr<Region>, nframes_t position);
      void split (nframes64_t at);
      void shift (nframes64_t at, nframes64_t distance, bool move_intersected, bool ignore_music_glue);
      void partition (nframes_t start, nframes_t end, bool just_top_level);
      void duplicate (boost::shared_ptr<Region>, nframes_t position, float times);
      void nudge_after (nframes_t start, nframes_t distance, bool forwards);
      void shuffle (boost::shared_ptr<Region>, int dir);
      void update_after_tempo_map_change ();

      boost::shared_ptr<Playlist> cut  (list<AudioRange>&, bool result_is_hidden = true);
      boost::shared_ptr<Playlist> copy (list<AudioRange>&, bool result_is_hidden = true);
      int                         paste (boost::shared_ptr<Playlist>, nframes_t position, float times);

      uint32_t                   count_regions_at (nframes_t frame);
      RegionList*                regions_at (nframes_t frame);
      RegionList*                regions_touched (nframes_t start, nframes_t end);
      RegionList*                regions_to_read (nframes_t start, nframes_t end);
      boost::shared_ptr<Region>  find_region (const PBD::ID&) const;
      boost::shared_ptr<Region>  top_region_at (nframes_t frame);
      boost::shared_ptr<Region>  find_next_region (nframes_t frame, RegionPoint point, int dir);
      nframes64_t                find_next_region_boundary (nframes64_t frame, int dir);
      bool                       region_is_shuffle_constrained (boost::shared_ptr<Region>);
      bool                       has_region_at (nframes64_t const) const;
      nframes64_t find_next_transient (nframes64_t position, int dir);

      template<class T> void foreach_region (T *t, void (T::*func)(boost::shared_ptr<Region>, void *), void *arg);
      template<class T> void foreach_region (T *t, void (T::*func)(boost::shared_ptr<Region>));

      XMLNode& get_state ();
      int set_state (const XMLNode&);
      XMLNode& get_template ();

      sigc::signal<void,bool> InUse;
      sigc::signal<void>      Modified;
      sigc::signal<void>      NameChanged;
      sigc::signal<void>      LengthChanged;
      sigc::signal<void>      LayeringChanged;

      static string bump_name (string old_name, Session&);

      void freeze ();
      void thaw ();

      void raise_region (boost::shared_ptr<Region>);
      void lower_region (boost::shared_ptr<Region>);
      void raise_region_to_top (boost::shared_ptr<Region>);
      void lower_region_to_bottom (boost::shared_ptr<Region>);

      uint32_t read_data_count() const { return _read_data_count; }

      Session& session() { return _session; }

      const PBD::ID& get_orig_diskstream_id () const { return _orig_diskstream_id; }
      void set_orig_diskstream_id (const PBD::ID& did) { _orig_diskstream_id = did; }  

      /* destructive editing */
      virtual bool destroy_region (boost::shared_ptr<Region>) = 0;

      /* special case function used by UI selection objects, which have playlists that actually own the regions
         within them.

      void drop_regions ();

      friend class Session;

      struct RegionLock {
          RegionLock (Playlist *pl, bool do_block_notify = true) : playlist (pl), block_notify (do_block_notify) {
                if (block_notify) {
          ~RegionLock() { 
                if (block_notify) {
                      playlist->release_notifications ();
          Playlist *playlist;
          bool block_notify;

      friend class RegionLock;

      RegionList       regions;  /* the current list of regions in the playlist */
      std::set<boost::shared_ptr<Region> > all_regions; /* all regions ever added to this playlist */
      string          _name;
      int             _sort_id;
      Session&        _session;
      mutable gint    block_notifications;
      mutable gint    ignore_state_changes;
      mutable Glib::Mutex region_lock;
      std::set<boost::shared_ptr<Region> > pending_adds;
      std::set<boost::shared_ptr<Region> > pending_removes;
      RegionList       pending_bounds;
      bool             pending_modified;
      bool             pending_length;
      bool             save_on_thaw;
      string           last_save_reason;
      uint32_t         in_set_state;
      bool             first_set_state;
      bool            _hidden;
      bool            _splicing;
      bool            _shuffling;
      bool            _nudging;
      uint32_t        _refcnt;
      EditMode        _edit_mode;
      bool             in_flush;
      bool             in_partition;
      bool            _frozen;
      uint32_t         subcnt;
      uint32_t        _read_data_count;
      PBD::ID         _orig_diskstream_id;
      uint64_t         layer_op_counter;
      nframes_t   freeze_length;

      void init (bool hide);

      bool holding_state () const { 
            return g_atomic_int_get (&block_notifications) != 0 ||
                  g_atomic_int_get (&ignore_state_changes) != 0;

      /* prevent the compiler from ever generating these */

      Playlist (const Playlist&);
      Playlist (Playlist&);

      void delay_notifications ();
      void release_notifications ();
      virtual void flush_notifications ();
      void _set_sort_id ();

      void notify_region_removed (boost::shared_ptr<Region>);
      void notify_region_added (boost::shared_ptr<Region>);
      void notify_length_changed ();
      void notify_layering_changed ();
      void notify_modified ();
      void notify_state_changed (Change);

      void mark_session_dirty();

      void region_changed_proxy (Change, boost::weak_ptr<Region>);
      virtual bool region_changed (Change, boost::shared_ptr<Region>);

      void region_bounds_changed (Change, boost::shared_ptr<Region>);
      void region_deleted (boost::shared_ptr<Region>);

      void sort_regions ();

      void possibly_splice (nframes_t at, nframes64_t distance, boost::shared_ptr<Region> exclude = boost::shared_ptr<Region>());
      void possibly_splice_unlocked(nframes_t at, nframes64_t distance, boost::shared_ptr<Region> exclude = boost::shared_ptr<Region>());

      void core_splice (nframes_t at, nframes64_t distance, boost::shared_ptr<Region> exclude);
      void splice_locked (nframes_t at, nframes64_t distance, boost::shared_ptr<Region> exclude);
      void splice_unlocked (nframes_t at, nframes64_t distance, boost::shared_ptr<Region> exclude);

      virtual void finalize_split_region (boost::shared_ptr<Region> original, boost::shared_ptr<Region> left, boost::shared_ptr<Region> right) {}
      virtual void check_dependents (boost::shared_ptr<Region> region, bool norefresh) {}
      virtual void refresh_dependents (boost::shared_ptr<Region> region) {}
      virtual void remove_dependents (boost::shared_ptr<Region> region) {}

      virtual XMLNode& state (bool);

      boost::shared_ptr<Region> region_by_id (PBD::ID);

      void add_region_internal (boost::shared_ptr<Region>, nframes_t position);
      int remove_region_internal (boost::shared_ptr<Region>);
      RegionList *find_regions_at (nframes_t frame);
      void copy_regions (RegionList&) const;
      void partition_internal (nframes_t start, nframes_t end, bool cutting, RegionList& thawlist);

      nframes_t _get_maximum_extent() const;

      boost::shared_ptr<Playlist> cut_copy (boost::shared_ptr<Playlist> (Playlist::*pmf)(nframes_t, nframes_t, bool), 
                                    list<AudioRange>& ranges, bool result_is_hidden);
      boost::shared_ptr<Playlist> cut (nframes_t start, nframes_t cnt, bool result_is_hidden);
      boost::shared_ptr<Playlist> copy (nframes_t start, nframes_t cnt, bool result_is_hidden);

      int move_region_to_layer (layer_t, boost::shared_ptr<Region> r, int dir);
      void relayer ();
      void unset_freeze_parent (Playlist*);
      void unset_freeze_child (Playlist*);

      void timestamp_layer_op (boost::shared_ptr<Region>);

      void _split_region (boost::shared_ptr<Region>, nframes_t position);

} /* namespace ARDOUR */

#endif      /* __ardour_playlist_h__ */

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