/*
  music.cc -- implement Music

  source file of the GNU LilyPond music typesetter

  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/

#include "main.hh"
#include "input-smob.hh"
#include "music.hh"
#include "music-list.hh"
#include "warn.hh"
#include "pitch.hh"
#include "ly-smobs.icc"

SCM
ly_deep_mus_copy (SCM m)
{
  if (unsmob_music (m))
    {
      SCM ss =  unsmob_music (m)->clone ()->self_scm ();
      scm_gc_unprotect_object (ss);
      return ss;
    }
  else if (gh_pair_p (m))
    {
      return gh_cons (ly_deep_mus_copy (ly_car (m)), ly_deep_mus_copy (ly_cdr (m)));
    }
  else
    return m;
}


Music::Music ()
{
  immutable_property_alist_ = SCM_EOL;
  mutable_property_alist_ = SCM_EOL;
  smobify_self ();
}

Music::Music (Music const &m)
{
  immutable_property_alist_ = m.immutable_property_alist_;
  mutable_property_alist_ = SCM_EOL;

  /*
    First we smobify_self, then we copy over the stuff.  If we don't,
    stack vars that hold the copy might be optimized away, meaning
    that they won't be protected from GC.
   */
  smobify_self ();
  mutable_property_alist_ = ly_deep_mus_copy (m.mutable_property_alist_);
  set_spot (*m.origin ());
}


Music::Music (SCM l)
{
  immutable_property_alist_ = l;
  mutable_property_alist_ = SCM_EOL;
  smobify_self ();
}


SCM
Music::mark_smob (SCM m)
{
  Music * mus = (Music *)SCM_CELL_WORD_1 (m);
  scm_gc_mark (mus->immutable_property_alist_);
  scm_gc_mark (mus->mutable_property_alist_);
  return SCM_EOL;
}

void    
Music::compress (Moment)
{
}



Moment
Music::length_mom () const
{
  SCM l = get_mus_property ("length");
  if (unsmob_moment (l))
    return *unsmob_moment (l);
  else if (gh_procedure_p (l))
    {
      SCM res = gh_call1 (l, self_scm ());
      return *unsmob_moment (res);
    }
    
  return 0;
}

Moment
Music::start_mom () const
{
  SCM l = get_mus_property ("start-moment-function");
  if (gh_procedure_p (l))
    {
      SCM res = gh_call1 (l, self_scm ());
      return *unsmob_moment (res);
    }

  Moment m ;
  return m;
}

void
print_alist (SCM a, SCM port)
{
  /*
    SCM_EOL  -> catch malformed lists.
  */
  for (SCM s = a; s != SCM_EOL; s = ly_cdr (s))
    {
      scm_display (ly_caar (s), port);
      scm_puts (" = ", port); 
      scm_write (ly_cdar (s), port);
      scm_puts ("\n", port);
    }
}

int
Music::print_smob (SCM s, SCM p, scm_print_state*)
{
  scm_puts ("#<Music ", p);
  Music* m = unsmob_music (s);
  scm_puts (classname (m),p);

  print_alist (m->mutable_property_alist_, p);
  print_alist (m->immutable_property_alist_, p);
  
  scm_puts (">",p);
  return 1;
}

Pitch
Music::to_relative_octave (Pitch m)
{
  return m;
}


void
Music::transpose (Pitch delta)
{
  Pitch *p = unsmob_pitch (get_mus_property ("pitch"));
  if (!p)
    return ;

  Pitch np = *p;
  np.transpose (delta);
  
  if (abs (np.alteration_) > 2)
    {
	warning (_f ("Transposition by %s makes accidental larger than two",
	  delta.string ()));
    }

  set_mus_property ("pitch", np.smobbed_copy ());
}

IMPLEMENT_TYPE_P (Music, "music?");

IMPLEMENT_SMOBS (Music);
IMPLEMENT_DEFAULT_EQUAL_P (Music);

/****************************/

SCM
Music::internal_get_mus_property (SCM sym) const
{
  SCM s = scm_sloppy_assq (sym, mutable_property_alist_);
  if (s != SCM_BOOL_F)
    return ly_cdr (s);

  s = scm_sloppy_assq (sym, immutable_property_alist_);
  return (s == SCM_BOOL_F) ? SCM_EOL : ly_cdr (s); 
}

void
Music::internal_set_mus_property (SCM s, SCM v)
{
  if (internal_type_checking_global_b)
    if (!type_check_assignment (s, v, ly_symbol2scm ("music-type?")))
      abort ();

  mutable_property_alist_ =  scm_assq_set_x (mutable_property_alist_, s, v);
}



#include "main.hh"

void
Music::set_spot (Input ip)
{
  set_mus_property ("origin", make_input (ip));
}

Input*
Music::origin () const
{
  Input *ip = unsmob_input (get_mus_property ("origin"));
  return ip ? ip : & dummy_input_global; 
}


Music::~Music ()
{
  
}

LY_DEFINE(ly_get_mus_property,
	  "ly-get-mus-property", 2, 0, 0,  (SCM mus, SCM sym),
	  "Get the property @var{sym} of music expression @var{mus}.")
{
  Music * sc = unsmob_music (mus);
  SCM_ASSERT_TYPE(sc, mus, SCM_ARG1, __FUNCTION__, "music");
  SCM_ASSERT_TYPE(gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");  

  return sc->internal_get_mus_property (sym);
}

LY_DEFINE(ly_set_mus_property,
	  "ly-set-mus-property!", 3, 0, 0,
	  (SCM mus, SCM sym, SCM val),
	  "Set property @var{sym} in music expression @var{mus} to @var{val}.")
{
  Music * sc = unsmob_music (mus);
  SCM_ASSERT_TYPE(sc, mus, SCM_ARG1, __FUNCTION__, "music");
  SCM_ASSERT_TYPE(gh_symbol_p (sym), sym, SCM_ARG2, __FUNCTION__, "symbol");  

  bool ok = type_check_assignment (sym, val, ly_symbol2scm ("music-type?"));
  if (ok)
    {
      sc->internal_set_mus_property (sym, val);
    }
    
  return SCM_UNSPECIFIED;
}


// to do  property args 
LY_DEFINE(ly_make_music,
	  "ly-make-music", 1, 0, 0,  (SCM type),
	  "
Make a music object/expression of type @var{name}. Warning: this
interface will likely change in the near future.



Music is the data type that music expressions are stored in. The data
type does not yet offer many manipulations.
")
{
  SCM_ASSERT_TYPE(gh_string_p (type), type, SCM_ARG1, __FUNCTION__, "string");
  
  SCM s = make_music (ly_scm2string (type))->self_scm ();
  scm_gc_unprotect_object (s);

  return s;
}

LY_DEFINE(ly_music_name, "ly-music-name", 1, 0, 0, 
  (SCM mus),
  "Return the name of @var{music}.")
{
  Music * m = unsmob_music (mus);
  SCM_ASSERT_TYPE(m, mus, SCM_ARG1, __FUNCTION__ ,"music");
  
  const char * nm = classname (m);
  return scm_makfrom0str (nm);
}

LY_DEFINE(ly_music_list_p,"music-list?", 1, 0, 0, 
  (SCM l),"Type predicate: return true if @var{l} is a list of music objects.")
{
  if (scm_list_p (l) != SCM_BOOL_T)
    return SCM_BOOL_F;

  while (gh_pair_p (l))
    {
      if (!unsmob_music (gh_car (l)))
	return SCM_BOOL_F;
      l =gh_cdr (l);
    }
  return SCM_BOOL_T;
}
ADD_MUSIC(Music);

