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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_tempo_h__
#define __ardour_tempo_h__

#include <list>
#include <string>
#include <vector>
#include <cmath>
#include <glibmm/thread.h>

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

#include <sigc++/signal.h>

#include <ardour/ardour.h>

class XMLNode;

using std::list;
using std::vector;

namespace ARDOUR {
class Meter;
class Tempo {
      Tempo (double bpm, double type=4.0) // defaulting to quarter note
            : _beats_per_minute (bpm), _note_type(type) {} 
      Tempo (const Tempo& other) {
            _beats_per_minute = other._beats_per_minute;
            _note_type = other._note_type;
      void operator= (const Tempo& other) {
            if (&other != this) {
                  _beats_per_minute = other._beats_per_minute;
                  _note_type = other._note_type;

      double beats_per_minute () const { return _beats_per_minute;}
      double note_type () const { return _note_type;}
      double frames_per_beat (nframes_t sr, const Meter& meter) const;

      double _beats_per_minute;
      double _note_type;

class Meter {
      static const double ticks_per_beat;

      Meter (double bpb, double bt) 
            : _beats_per_bar (bpb), _note_type (bt) {}
      Meter (const Meter& other) {
            _beats_per_bar = other._beats_per_bar;
            _note_type = other._note_type;
      void operator= (const Meter& other) {
            if (&other != this) {
                  _beats_per_bar = other._beats_per_bar;
                  _note_type = other._note_type;

      double beats_per_bar () const { return _beats_per_bar; }
      double note_divisor() const { return _note_type; }
      double frames_per_bar (const Tempo&, nframes_t sr) const;


      /* this is the number of beats in a bar. it is a real value
         because there are musical traditions on our planet
         that do not limit themselves to integral numbers of beats
         per bar.

      double _beats_per_bar;

      /* this is the type of "note" that a beat represents. for example,
         4.0 would be a quarter (crotchet) note, 8.0 would be an eighth 
         (quaver) note, etc.

      double _note_type;

class MetricSection {
      MetricSection (const BBT_Time& start)
            : _start (start), _frame (0), _movable (true) {}
      MetricSection (nframes_t start)
            : _frame (start), _movable (true) {}

      virtual ~MetricSection() {}

      const BBT_Time& start() const { return _start; }
      const nframes_t frame() const { return _frame; }

      void set_movable (bool yn) { _movable = yn; }
      bool movable() const { return _movable; }

      virtual void set_frame (nframes_t f) {
            _frame = f;

      virtual void set_start (const BBT_Time& w) {
            _start = w;

      /* MeterSections are not stateful in the full sense,
         but we do want them to control their own
         XML state information.

      virtual XMLNode& get_state() const = 0;

      BBT_Time       _start;
      nframes_t _frame;
      bool           _movable;

class MeterSection : public MetricSection, public Meter {
      MeterSection (const BBT_Time& start, double bpb, double note_type)
            : MetricSection (start), Meter (bpb, note_type) {}
      MeterSection (nframes_t start, double bpb, double note_type)
            : MetricSection (start), Meter (bpb, note_type) {}
      MeterSection (const XMLNode&);

      static const string xml_state_node_name;

      XMLNode& get_state() const;

class TempoSection : public MetricSection, public Tempo {
      TempoSection (const BBT_Time& start, double qpm, double note_type)
            : MetricSection (start), Tempo (qpm, note_type) {}
      TempoSection (nframes_t start, double qpm, double note_type)
            : MetricSection (start), Tempo (qpm, note_type) {}
      TempoSection (const XMLNode&);

      static const string xml_state_node_name;

      XMLNode& get_state() const;

typedef list<MetricSection*> Metrics;

class TempoMap : public PBD::StatefulDestructible
      TempoMap (nframes_t frame_rate);

      /* measure-based stuff */

      enum BBTPointType {

      struct BBTPoint {
          BBTPointType type;
          nframes_t frame;
          const Meter* meter;
          const Tempo* tempo;
          uint32_t bar;
          uint32_t beat;
          BBTPoint (const Meter& m, const Tempo& t, nframes_t f, BBTPointType ty, uint32_t b, uint32_t e) 
                : type (ty), frame (f), meter (&m), tempo (&t), bar (b), beat (e) {}

      typedef vector<BBTPoint> BBTPointList;
      template<class T> void apply_with_metrics (T& obj, void (T::*method)(const Metrics&)) {
              Glib::RWLock::ReaderLock lm (lock);

      BBTPointList *get_points (nframes_t start, nframes_t end) const;

      void      bbt_time (nframes_t when, BBT_Time&) const;
      nframes_t frame_time (const BBT_Time&) const;
      nframes_t bbt_duration_at (nframes_t, const BBT_Time&, int dir) const;

      static const Tempo& default_tempo() { return _default_tempo; }
      static const Meter& default_meter() { return _default_meter; }

      const Tempo& tempo_at (nframes_t);
      const Meter& meter_at (nframes_t);

      const TempoSection& tempo_section_at (nframes_t);

      void add_tempo(const Tempo&, BBT_Time where);
      void add_meter(const Meter&, BBT_Time where);

      void add_tempo(const Tempo&, nframes_t where);
      void add_meter(const Meter&, nframes_t where);

      void move_tempo (TempoSection&, const BBT_Time& to);
      void move_meter (MeterSection&, const BBT_Time& to);
      void remove_tempo(const TempoSection&);
      void remove_meter(const MeterSection&);

      void replace_tempo (TempoSection& existing, const Tempo& replacement);
      void replace_meter (MeterSection& existing, const Meter& replacement);

      nframes_t round_to_bar  (nframes_t frame, int dir);

      nframes_t round_to_beat (nframes_t frame, int dir);

      nframes_t round_to_beat_subdivision (nframes_t fr, int sub_num);

      nframes_t round_to_tick (nframes_t frame, int dir);

      void set_length (nframes_t frames);

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

      void dump (std::ostream&) const;
      void clear ();

      /* this is a helper class that we use to be able to keep
         track of which meter *AND* tempo are in effect at
         a given point in time.

      class Metric {
            Metric (const Meter& m, const Tempo& t) : _meter (&m), _tempo (&t), _frame (0) {}
            void set_tempo (const Tempo& t)    { _tempo = &t; }
            void set_meter (const Meter& m)    { _meter = &m; }
            void set_frame (nframes_t f)  { _frame = f; }
            void set_start (const BBT_Time& t) { _start = t; }
            const Meter&    meter() const { return *_meter; }
            const Tempo&    tempo() const { return *_tempo; }
            nframes_t  frame() const { return _frame; }
            const BBT_Time& start() const { return _start; }
            const Meter*   _meter;
            const Tempo*   _tempo;
            nframes_t _frame;
            BBT_Time       _start;

      Metric metric_at (BBT_Time bbt) const;
      Metric metric_at (nframes_t) const;
        void bbt_time_with_metric (nframes_t, BBT_Time&, const Metric&) const;

      void change_existing_tempo_at (nframes_t, double bpm, double note_type);
      void change_initial_tempo (double bpm, double note_type);

      int n_tempos () const;
      int n_meters () const;

      sigc::signal<void,ARDOUR::Change> StateChanged;

      static Tempo    _default_tempo;
      static Meter    _default_meter;

      Metrics*             metrics;
      nframes_t           _frame_rate;
      nframes_t            last_bbt_when;
      bool                 last_bbt_valid;
      BBT_Time             last_bbt;
      mutable Glib::RWLock lock;
      void timestamp_metrics (bool use_bbt);

      nframes_t round_to_type (nframes_t fr, int dir, BBTPointType);

      nframes_t frame_time_unlocked (const BBT_Time&) const;

      void bbt_time_unlocked (nframes_t, BBT_Time&) const;

      nframes_t bbt_duration_at_unlocked (const BBT_Time& when, const BBT_Time& bbt, int dir) const;

      const MeterSection& first_meter() const;
      const TempoSection& first_tempo() const;

      nframes_t count_frames_between (const BBT_Time&, const BBT_Time&) const;
      nframes_t count_frames_between_metrics (const Meter&, const Tempo&, const BBT_Time&, const BBT_Time&) const;

      int move_metric_section (MetricSection&, const BBT_Time& to);
      void do_insert (MetricSection* section, bool with_bbt);

}; /* namespace ARDOUR */

#endif /* __ardour_tempo_h__ */

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