/*
  custos.cc -- implement Custos

  source file of the GNU LilyPond music typesetter

  (c) 2000--2004 Juergen Reuter <reuter@ipd.uka.de>
*/

/* TODO:

 - do not show if a clef change immediately follows in the next line

 - decide: do or do not print custos if the next line starts with a rest

*/


#include <stdio.h>
#include "direction.hh"
#include "staff-symbol-referencer.hh"
#include "custos.hh"
#include "stencil.hh"
#include "warn.hh"
#include "note-head.hh"
#include "item.hh"
#include "font-interface.hh"
#include "math.h" // rint

MAKE_SCHEME_CALLBACK (Custos,print,1);
SCM
Custos::print (SCM smob)
{
  Item *me = (Item *)unsmob_grob (smob);

  SCM scm_style = me->get_property ("style");
  String style;
  if (scm_is_symbol (scm_style))
    {
      style = ly_symbol2string (scm_style);
    }
  else
    {
      style = "mensural";
    }

  /*
   * Shall we use a common custos font character regardless if on
   * staffline or not, or shall we use individual font characters
   * for both cases?
   */
  bool adjust = true; 

  int neutral_pos = robust_scm2int (me->get_property ("neutral-position"), 0);
  Direction neutral_direction =
    to_dir (me->get_property ("neutral-direction"));

  int pos = Staff_symbol_referencer::get_rounded_position (me);
  int sz = Staff_symbol_referencer::line_count (me)-1;

  String font_char = "custodes-" + style + "-";
  if (pos < neutral_pos)
    font_char += "u";
  else if (pos > neutral_pos)
    font_char += "d";
  else if (neutral_direction == UP)
    font_char += "u";
  else if (neutral_direction == DOWN)
    font_char += "d";
  else // auto direction; not yet supported -> use "d"
    font_char += "d";

  if (adjust)
    {
      font_char += (((pos ^ sz) & 0x1) == 0) ? "1" : "0";
    }
  else
    {
      font_char += "2";
    }

  Stencil stencil
    = Font_interface::get_default_font (me)->find_by_name (font_char);
  if (stencil.is_empty ())
    {
      me->warning (_f ("custos `%s' not found", font_char));
      return SCM_EOL;
    }

  return stencil.smobbed_copy ();
}

ADD_INTERFACE (Custos, "custos-interface",
  "A custos object.",
  "style neutral-position neutral-direction");
