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

  Copyright (C) 1998--2020 Jan Nieuwenhuizen <janneke@gnu.org>
  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 "font-interface.hh"
#include "grob-array.hh"
#include "international.hh"
#include "item.hh"
#include "output-def.hh"
#include "paper-score.hh"
#include "system.hh"
#include "unpure-pure-container.hh"
#include "warn.hh"              // error ()

LY_DEFINE (ly_grob_property_data, "ly:grob-property-data",
           2, 0, 0, (SCM grob, SCM sym),
           "Return the value for property @var{sym} of @var{grob},"
           " but do not process callbacks.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);

  return get_property_data (sc, sym);
}

LY_DEFINE (ly_grob_set_property_x, "ly:grob-set-property!",
           3, 0, 0, (SCM grob, SCM sym, SCM val),
           "Set @var{sym} in grob @var{grob} to value @var{val}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);

  if (!ly_is_procedure (val)
      && !type_check_assignment (sym, val, ly_symbol2scm ("backend-type?")))
    error (_ ("typecheck failed"));

  set_property (sc, sym, val);
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_set_nested_property_x, "ly:grob-set-nested-property!",
           3, 0, 0, (SCM grob, SCM symlist, SCM val),
           "Set nested property @var{symlist} in grob @var{grob} to value @var{val}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  bool type_ok = scm_is_pair (symlist);

  if (type_ok)
    for (SCM s = symlist; scm_is_pair (s) && type_ok; s = scm_cdr (s))
      type_ok &= ly_is_symbol (scm_car (s));

  SCM_ASSERT_TYPE (type_ok, symlist, SCM_ARG2, __FUNCTION__, "list of symbols");

  if (scm_is_pair (scm_cdr (symlist)))
    set_nested_property (sc, symlist, val);
  else
    ly_grob_set_property_x (grob, scm_car (symlist), val);
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_pure_property, "ly:grob-pure-property",
           4, 1, 0, (SCM grob, SCM sym, SCM beg, SCM end, SCM val),
           "Return the pure value for property @var{sym} of @var{grob}."
           "  If no value is found, return @var{val} or @code{'()}"
           " if @var{val} is not specified.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  LY_ASSERT_TYPE (scm_is_integer, beg, 3);
  LY_ASSERT_TYPE (scm_is_integer, end, 4);
  if (SCM_UNBNDP (val))
    val = SCM_EOL;

  SCM retval = sc->internal_get_pure_property (sym, scm_to_int (beg), scm_to_int (end));
  if (scm_is_null (retval))
    retval = val;

  return retval;
}

LY_DEFINE (ly_grob_pure_height, "ly:grob-pure-height",
           4, 1, 0, (SCM grob, SCM refp, SCM beg, SCM end, SCM val),
           "Return the pure height of @var{grob} given refpoint @var{refp}."
           "  If no value is found, return @var{val} or @code{'()}"
           " if @var{val} is not specified.")
{
  Grob *sc = unsmob<Grob> (grob);
  Grob *ref = unsmob<Grob> (refp);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob, refp, 2);
  LY_ASSERT_TYPE (scm_is_integer, beg, 3);
  LY_ASSERT_TYPE (scm_is_integer, end, 4);
  if (SCM_UNBNDP (val))
    val = SCM_EOL;

  Interval retval = sc->pure_y_extent (ref, scm_to_int (beg), scm_to_int (end));

  return to_scm (retval);
}

LY_DEFINE (ly_grob_property, "ly:grob-property",
           2, 1, 0, (SCM grob, SCM sym, SCM val),
           "Return the value for property @var{sym} of @var{grob}."
           "  If no value is found, return @var{val} or @code{'()}"
           " if @var{val} is not specified.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);
  if (SCM_UNBNDP (val))
    val = SCM_EOL;

  SCM retval = get_property (sc, sym);
  if (scm_is_null (retval))
    retval = val;

  return retval;
}

LY_DEFINE (ly_grob_interfaces, "ly:grob-interfaces",
           1, 0, 0, (SCM grob),
           "Return the interfaces list of grob @var{grob}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  return sc->interfaces ();
}

LY_DEFINE (ly_grob_object, "ly:grob-object",
           2, 0, 0, (SCM grob, SCM sym),
           "Return the value of a pointer in grob @var{grob} of property"
           " @var{sym}.  It returns @code{'()} (end-of-list) if @var{sym}"
           " is undefined in @var{grob}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);

  return sc->internal_get_object (sym);
}

LY_DEFINE (ly_grob_set_object_x, "ly:grob-set-object!",
           3, 0, 0, (SCM grob, SCM sym, SCM val),
           "Set @var{sym} in grob @var{grob} to value @var{val}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (ly_is_symbol, sym, 2);

  set_object (sc, sym, val);
  return SCM_UNSPECIFIED;
}

/* TODO: make difference between scaled and unscalead variable in
   calling (i.e different funcs.) */
LY_DEFINE (ly_grob_layout, "ly:grob-layout",
           1, 0, 0, (SCM grob),
           "Get @code{\\layout} definition from grob @var{grob}.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  return sc->layout ()->self_scm ();
}

LY_DEFINE (ly_grob_alist_chain, "ly:grob-alist-chain",
           1, 1, 0, (SCM grob, SCM global),
           "Get an alist chain for grob @var{grob}, with @var{global} as"
           " the global default.  If unspecified, @code{font-defaults}"
           " from the layout block is taken.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  if (SCM_UNBNDP (global))
    {
      global = sc->layout ()->lookup_variable (ly_symbol2scm ("font-defaults"));
      if (SCM_UNBNDP (global))
        global = SCM_EOL;
    }

  return sc->get_property_alist_chain (global);
}

LY_DEFINE (ly_grob_extent, "ly:grob-extent",
           3, 0, 0, (SCM grob, SCM refp, SCM axis),
           "Get the extent in @var{axis} direction of @var{grob} relative to"
           " the grob @var{refp}.")
{
  Grob *sc = unsmob<Grob> (grob);
  Grob *ref = unsmob<Grob> (refp);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob, refp, 2);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 3);

  Axis a = Axis (scm_to_int (axis));

  if (ref->common_refpoint (sc, a) != ref)
    {
      // ugh. should use other error message
      SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
    }
  return to_scm (sc->extent (ref, a));
}

LY_DEFINE (ly_grob_robust_relative_extent, "ly:grob-robust-relative-extent",
           3, 0, 0, (SCM grob, SCM refp, SCM axis),
           "Get the extent in @var{axis} direction of @var{grob} relative to"
           " the grob @var{refp}, or @code{(0,0)} if empty.")
{
  Grob *sc = unsmob<Grob> (grob);
  Grob *ref = unsmob<Grob> (refp);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob, refp, 2);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 3);

  Axis a = Axis (scm_to_int (axis));

  if (ref->common_refpoint (sc, a) != ref)
    {
      // ugh. should use other error message
      SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
    }

  return to_scm (robust_relative_extent (sc, ref, a));
}

LY_DEFINE (ly_grob_relative_coordinate, "ly:grob-relative-coordinate",
           3, 0, 0, (SCM grob, SCM refp, SCM axis),
           "Get the coordinate in @var{axis} direction of @var{grob} relative"
           " to the grob @var{refp}.")
{
  Grob *sc = unsmob<Grob> (grob);
  Grob *ref = unsmob<Grob> (refp);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob, refp, 2);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 3);

  Axis a = Axis (scm_to_int (axis));

  if (ref->common_refpoint (sc, a) != ref)
    {
      // ugh. should use other error message
      SCM_ASSERT_TYPE (false, refp, SCM_ARG2, __FUNCTION__, "common refpoint");
    }

  return to_scm (sc->relative_coordinate (ref, a));
}

LY_DEFINE (ly_grob_parent, "ly:grob-parent",
           2, 0, 0, (SCM grob, SCM axis),
           "Get the parent of @var{grob}.  @var{axis} is 0 for the X-axis,"
           " 1@tie{}for the Y-axis.")
{
  Grob *sc = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 2);

  Grob *par = sc->get_parent (Axis (scm_to_int (axis)));
  return par ? par->self_scm () : SCM_EOL;
}

LY_DEFINE (ly_grob_set_parent_x, "ly:grob-set-parent!",
           3, 0, 0, (SCM grob, SCM axis, SCM parent_grob),
           "Set @var{parent-grob} the parent of grob @var{grob} in axis @var{axis}.")
{
  Grob *gr = unsmob<Grob> (grob);
  Grob *parent = unsmob<Grob> (parent_grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 2);
  LY_ASSERT_SMOB (Grob, parent_grob, 3);

  Axis a = Axis (scm_to_int (axis));
  gr->set_parent (parent, a);
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_basic_properties, "ly:grob-basic-properties",
           1, 0, 0, (SCM grob),
           "Get the immutable properties of @var{grob}.")
{
  Grob *g = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  /* FIXME: uhg? copy/read only? */
  return g->immutable_property_alist_;
}

LY_DEFINE (ly_grob_system, "ly:grob-system",
           1, 0, 0, (SCM grob),
           "Return the system grob of @var{grob}.")
{
  Grob *me = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  if (System *g = me->get_system ())
    return g->self_scm ();

  return SCM_EOL;
}

LY_DEFINE (ly_grob_original, "ly:grob-original",
           1, 0, 0, (SCM grob),
           "Return the unbroken original grob of @var{grob}.")
{
  Grob *me = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  return me->original () ? me->original ()->self_scm () : me->self_scm ();
}

LY_DEFINE (ly_grob_suicide_x, "ly:grob-suicide!",
           1, 0, 0, (SCM grob),
           "Kill @var{grob}.")
{
  Grob *me = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  me->suicide ();
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_translate_axis_x, "ly:grob-translate-axis!",
           3, 0, 0, (SCM grob, SCM d, SCM a),
           "Translate @var{grob} on axis@tie{}@var{a} over"
           " distance@tie{}@var{d}.")
{
  Grob *me = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_TYPE (scm_is_number, d, 2);
  LY_ASSERT_TYPE (is_scm<Axis>, a, 3);

  me->translate_axis (scm_to_double (d), Axis (scm_to_int (a)));
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_default_font, "ly:grob-default-font",
           1, 0, 0, (SCM grob),
           "Return the default font for grob @var{grob}.")
{
  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  return Font_interface::get_default_font (gr)->self_scm ();
}

/*
  TODO: consider swapping order, so we can do

  (grob-common-refpoint a b c d e)
 */
LY_DEFINE (ly_grob_common_refpoint, "ly:grob-common-refpoint",
           3, 0, 0, (SCM grob, SCM other, SCM axis),
           "Find the common refpoint of @var{grob} and @var{other}"
           " for @var{axis}.")
{

  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob, other, 2);

  Grob *o = unsmob<Grob> (other);

  LY_ASSERT_TYPE (is_scm<Axis>, axis, 3);

  Grob *refp = gr->common_refpoint (o, Axis (scm_to_int (axis)));
  return refp ? refp->self_scm () : SCM_BOOL_F;
}

LY_DEFINE (ly_grob_common_refpoint_of_array, "ly:grob-common-refpoint-of-array",
           3, 0, 0, (SCM grob, SCM others, SCM axis),
           "Find the common refpoint of @var{grob} and @var{others}"
           " (a grob-array) for @var{axis}.")
{
  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  LY_ASSERT_SMOB (Grob_array, others, 2);

  Grob_array *ga = unsmob<Grob_array> (others);
  LY_ASSERT_TYPE (is_scm<Axis>, axis, 3);

  Grob *refp = common_refpoint_of_array (ga->array (), gr, Axis (scm_to_int (axis)));
  return refp ? refp->self_scm () : SCM_BOOL_F;
}

LY_DEFINE (ly_grob_chain_callback, "ly:grob-chain-callback",
           3, 0, 0, (SCM grob, SCM proc, SCM sym),
           "Find the callback that is stored as property"
           " @var{sym} of grob @var{grob} and chain @var{proc}"
           " to the head of this, meaning that it is called"
           " using @var{grob} and the previous callback's result.")
{
  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);
  SCM_ASSERT_TYPE (ly_is_procedure (proc) || unsmob<Unpure_pure_container> (proc), proc, SCM_ARG2, __FUNCTION__, "procedure or unpure pure container");
  LY_ASSERT_TYPE (ly_is_symbol, sym, 3);

  chain_callback (gr, proc, sym);
  return SCM_UNSPECIFIED;
}

LY_DEFINE (ly_grob_vertical_less_p, "ly:grob-vertical<?",
           2, 0, 0, (SCM a, SCM b),
           "Does @var{a} lie above @var{b} on the page?")
{
  LY_ASSERT_SMOB (Grob, a, 1);
  LY_ASSERT_SMOB (Grob, b, 2);

  Grob *ga = unsmob<Grob> (a);
  Grob *gb = unsmob<Grob> (b);

  return ly_bool2scm (Grob::vertical_less (ga, gb));
}

LY_DEFINE (ly_grob_get_vertical_axis_group_index, "ly:grob-get-vertical-axis-group-index",
           1, 0, 0, (SCM grob),
           "Get the index of the vertical axis group the grob @var{grob} belongs to;"
           " return @code{-1} if none is found.")
{
  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  return to_scm (Grob::get_vertical_axis_group_index (gr));
}

LY_DEFINE (ly_grob_spanned_rank_interval, "ly:grob-spanned-rank-interval",
           1, 0, 0, (SCM grob),
           "Returns a pair with the @code{rank} of the furthest left"
           " column and the @code{rank} of the furthest right column"
           " spanned by @code{grob}.")
{
  Grob *gr = unsmob<Grob> (grob);

  LY_ASSERT_SMOB (Grob, grob, 1);

  Interval_t<int> iv = gr->spanned_rank_interval ();

  return scm_cons (to_scm (iv[LEFT]), to_scm (iv[RIGHT]));
}
