/*
  cluster-engraver.cc -- implement Cluster_engraver

  (c) 2002--2006 Juergen Reuter <reuter@ipd.uka.de>

  Han-Wen Nienhuys <hanwen@xs4all.nl>
*/

#include "engraver.hh"
#include "spanner.hh"
#include "note-head.hh"
#include "note-column.hh"
#include "pointer-group-interface.hh"
#include "pitch.hh"

class Cluster_spanner_engraver : public Engraver
{

protected:
  TRANSLATOR_DECLARATIONS (Cluster_spanner_engraver);
  virtual bool try_music (Music *);
  void process_music ();
  DECLARE_ACKNOWLEDGER (note_column);
  void stop_translation_timestep ();
  virtual void finalize ();
private:
  vector<Music*> cluster_notes_;
  Item *beacon_;

  void typeset_grobs ();
  Spanner *spanner_;
  Spanner *finished_spanner_;
};

Cluster_spanner_engraver::Cluster_spanner_engraver ()
{
  spanner_ = 0;
  finished_spanner_ = 0;
  beacon_ = 0;
}

void
Cluster_spanner_engraver::finalize ()
{
  typeset_grobs ();
  finished_spanner_ = spanner_;
  spanner_ = 0;
  typeset_grobs ();
}

void
Cluster_spanner_engraver::typeset_grobs ()
{
  finished_spanner_ = 0;
  beacon_ = 0;
}

bool
Cluster_spanner_engraver::try_music (Music *m)
{
  if (m->is_mus_type ("cluster-note-event"))
    {
      cluster_notes_.push_back (m);
      return true;
    }
  else if (m->is_mus_type ("busy-playing-event"))
    return cluster_notes_.size ();

  return false;
}

void
Cluster_spanner_engraver::process_music ()
{
  if (cluster_notes_.size ())
    {
      SCM c0scm = get_property ("middleCPosition");

      int c0 = scm_is_number (c0scm) ? scm_to_int (c0scm) : 0;
      int pmax = INT_MIN;
      int pmin = INT_MAX;

      for (vsize i = 0; i < cluster_notes_.size (); i++)
	{
	  Pitch *pit = unsmob_pitch (cluster_notes_[i]->get_property ("pitch"));

	  int p = (pit ? pit->steps () : 0) + c0;

	  pmax = max (pmax, p);
	  pmin = min (pmin, p);
	}

      beacon_ = make_item ("ClusterSpannerBeacon", cluster_notes_[0]->self_scm ());
      beacon_->set_property ("positions",
			     scm_cons (scm_from_int (pmin),
				       scm_from_int (pmax)));
    }

  if (beacon_ && !spanner_)
    spanner_ = make_spanner ("ClusterSpanner", cluster_notes_[0]->self_scm ());

  if (beacon_ && spanner_)
    {
      add_bound_item (spanner_, beacon_);
      Pointer_group_interface::add_grob (spanner_, ly_symbol2scm ("columns"), beacon_);
    }
}

void
Cluster_spanner_engraver::stop_translation_timestep ()
{
  typeset_grobs ();
  cluster_notes_.clear ();
}

void
Cluster_spanner_engraver::acknowledge_note_column (Grob_info info)
{
  if (!beacon_ && Note_column::has_interface (info.grob ()))
    {
      finished_spanner_ = spanner_;
      spanner_ = 0;
    }
}

#include "translator.icc"

ADD_ACKNOWLEDGER (Cluster_spanner_engraver, note_column);
ADD_TRANSLATOR (Cluster_spanner_engraver,
		/* doc */ 	"Engraves a cluster using Spanner notation ",
		/* create */ 	"ClusterSpanner ClusterSpannerBeacon",
		/* accept */ 	"cluster-note-event busy-playing-event",
		/* read */ 	"",
		/* write */	"");

