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

  Copyright (C) 1997--2012 Han-Wen Nienhuys <hanwen@xs4all.nl>

  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/>.
*/

#include "context.hh"
#include "dispatcher.hh"
#include "engraver-group.hh"
#include "grob.hh"
#include "paper-score.hh"
#include "translator-dispatch-list.hh"
#include "warn.hh"

IMPLEMENT_LISTENER (Engraver_group, override);
void
Engraver_group::override (SCM sev)
{
  Stream_event *ev = unsmob_stream_event (sev);

  sloppy_general_pushpop_property (context (),
                                   ev->get_property ("symbol"),
                                   ev->get_property ("property-path"),
                                   ev->get_property ("value"));
}

IMPLEMENT_LISTENER (Engraver_group, revert);
void
Engraver_group::revert (SCM sev)
{
  Stream_event *ev = unsmob_stream_event (sev);

  sloppy_general_pushpop_property (context (),
                                   ev->get_property ("symbol"),
                                   ev->get_property ("property-path"),
                                   SCM_UNDEFINED);
}

void
Engraver_group::connect_to_context (Context *c)
{
  Translator_group::connect_to_context (c);
  c->event_source ()->add_listener (GET_LISTENER (override), ly_symbol2scm ("Override"));
  c->event_source ()->add_listener (GET_LISTENER (revert), ly_symbol2scm ("Revert"));
}

void
Engraver_group::disconnect_from_context ()
{
  context ()->event_source ()->remove_listener (GET_LISTENER (override), ly_symbol2scm ("Override"));
  context ()->event_source ()->remove_listener (GET_LISTENER (revert), ly_symbol2scm ("Revert"));
  Translator_group::disconnect_from_context ();
}

void
Engraver_group::announce_grob (Grob_info info)
{
  announce_infos_.push_back (info);

  Context *dad_con = context_->get_parent_context ();
  if (info.rerouting_daddy_context_)
    {
      dad_con = info.rerouting_daddy_context_;
      info.rerouting_daddy_context_ = 0;
    }

  Engraver_group *dad_eng
    = dad_con
      ? dynamic_cast<Engraver_group *> (dad_con->implementation ())
      : 0;

  if (dad_eng)
    dad_eng->announce_grob (info);
}

void
Engraver_group::acknowledge_grobs ()
{
  if (!announce_infos_.size ())
    return;

  SCM name_sym = ly_symbol2scm ("name");
  SCM meta_sym = ly_symbol2scm ("meta");

  for (vsize j = 0; j < announce_infos_.size (); j++)
    {
      Grob_info info = announce_infos_[j];

      SCM meta = info.grob ()->internal_get_property (meta_sym);
      SCM nm = scm_assoc (name_sym, meta);
      if (scm_is_pair (nm))
        nm = scm_cdr (nm);
      else
        continue;

      SCM acklist = scm_hashq_ref (acknowledge_hash_table_drul_[info.start_end ()],
                                   nm, SCM_BOOL_F);

      Engraver_dispatch_list *dispatch
        = Engraver_dispatch_list::unsmob (acklist);

      if (acklist == SCM_BOOL_F)
        {
          SCM ifaces
            = scm_cdr (scm_assoc (ly_symbol2scm ("interfaces"), meta));
          acklist = Engraver_dispatch_list::create (get_simple_trans_list (),
                                                    ifaces, info.start_end ());

          dispatch
            = Engraver_dispatch_list::unsmob (acklist);

          scm_hashq_set_x (acknowledge_hash_table_drul_[info.start_end ()], nm, acklist);
        }

      if (dispatch)
        dispatch->apply (info);
    }
}

/*
  Ugh. This is slightly expensive. We could/should cache the value of
  the group count?
*/
int
Engraver_group::pending_grob_count () const
{
  int count = announce_infos_.size ();
  for (SCM s = context_->children_contexts ();
       scm_is_pair (s); s = scm_cdr (s))
    {
      Context *c = unsmob_context (scm_car (s));
      Engraver_group *group
        = dynamic_cast<Engraver_group *> (c->implementation ());

      if (group)
        count += group->pending_grob_count ();
    }
  return count;
}

void
Engraver_group::do_announces ()
{
  do
    {
      /*
        DOCME: why is this inside the loop?
       */
      for (SCM s = context ()->children_contexts ();
           scm_is_pair (s); s = scm_cdr (s))
        {
          Context *c = unsmob_context (scm_car (s));
          Engraver_group *group
            = dynamic_cast<Engraver_group *> (c->implementation ());
          if (group)
            group->do_announces ();
        }

      while (1)
        {
          precomputed_translator_foreach (PROCESS_ACKNOWLEDGED);
          if (announce_infos_.size () == 0)
            break;

          acknowledge_grobs ();
          announce_infos_.clear ();
        }
    }
  while (pending_grob_count () > 0);
}

Engraver_group::Engraver_group ()
{
  acknowledge_hash_table_drul_[LEFT]
    = acknowledge_hash_table_drul_[RIGHT]
      = SCM_EOL;

  acknowledge_hash_table_drul_[LEFT] = scm_c_make_hash_table (61);
  acknowledge_hash_table_drul_[RIGHT] = scm_c_make_hash_table (61);
}

#include "translator.icc"

ADD_TRANSLATOR_GROUP (Engraver_group,
                      /* doc */
                      "A group of engravers taken together.",

                      /* create */
                      "",

                      /* read */
                      "",

                      /* write */
                      ""
                     );

void
Engraver_group::derived_mark () const
{
  scm_gc_mark (acknowledge_hash_table_drul_[LEFT]);
  scm_gc_mark (acknowledge_hash_table_drul_[RIGHT]);
}
