/*
  This file is part of LilyPond, the GNU music typesetter.

  Copyright (C) 1996--2020 Jan Nieuwenhuizen <janneke@gnu.org>

  LilyPond 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 3 of the License, or
  (at your option) any later version.

  LilyPond 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 LilyPond.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef AUDIO_ITEM_HH
#define AUDIO_ITEM_HH

#include "audio-element.hh"
#include "moment.hh"
#include "pitch.hh"

class Audio_item : public Audio_element
{
public:
  Audio_column *audio_column_;
  int channel_;

  Audio_item ();
  Audio_column *get_column () const;

  virtual void render ();

private:
  Audio_item (Audio_item const &);
  Audio_item &operator = (Audio_item const &);
};

// Audio_span_dynamic is open at the end of the interval, so the volume
// grows/diminshes toward a target, but whether it reaches it depends on the
// next Audio_span_dynamic in the performance.  For example, a crescendo
// notated as mf < p is represented as [mf < x) [p ...) i.e. growth to some
// volume louder than mf followed by an abrupt change to p.
class Audio_span_dynamic : public Audio_element
{
public:
  static const Real MINIMUM_VOLUME;
  static const Real MAXIMUM_VOLUME;
  static const Real DEFAULT_VOLUME;

private:
  Moment start_moment_;
  Real start_volume_;
  Real duration_; // = target moment - start moment
  Real gain_; // = target volume - start volume

public:
  Moment get_start_moment () const { return start_moment_; }
  Real get_start_volume () const { return start_volume_; }
  Real get_duration () const { return duration_; }
  void set_end_moment (Moment);
  void set_volume (Real start, Real target);
  Real get_volume (Moment) const;
  Audio_span_dynamic (Moment mom, Real volume);
};

class Audio_key : public Audio_item
{
public:
  Audio_key (int acc, bool major);

  int accidentals_;
  bool major_;
};

class Audio_instrument : public Audio_item
{
public:
  Audio_instrument (std::string instrument_string);

  std::string str_;
};

class Audio_note : public Audio_item
{
public:
  Audio_note (Pitch p, Moment m, bool tie_event, Pitch transposition, int velocity);

  // with tieWaitForNote, there might be a skip between the tied notes!
  void tie_to (Audio_note *, Moment skip = 0);
  Audio_note *tie_head ();
  virtual std::string to_string () const;

  Pitch pitch_;
  Moment length_mom_;
  Pitch transposing_;
  Audio_span_dynamic *dynamic_;
  int extra_velocity_;

  Audio_note *tied_;
  bool tie_event_;
};

class Audio_piano_pedal : public Audio_item
{
public:
  std::string type_string_;
  Direction dir_;
};

class Audio_text : public Audio_item
{
public:
  enum Type : uint8_t
  {
    TEXT = 1, COPYRIGHT, TRACK_NAME, INSTRUMENT_NAME, LYRIC,
    MARKER, CUE_POINT
  };

  Audio_text (Audio_text::Type type, const std::string &text_string);

  Type type_;
  std::string text_string_;
};

class Audio_tempo : public Audio_item
{
public:
  Audio_tempo (int per_minute_4);

  int per_minute_4_;
};

class Audio_time_signature : public Audio_item
{
public:
  Audio_time_signature (int beats, int one_beat);

  int beats_;
  int one_beat_;
};

class Audio_control_change : public Audio_item
{
public:
  Audio_control_change (int control, int value);

  int control_;
  int value_;
};

int moment_to_ticks (Moment);
Real moment_to_real (Moment);
Moment remap_grace_duration (Moment);

#endif // AUDIO_ITEM_HH

