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

  Copyright (C) 2008--2020 Han-Wen Nienhuys <hanwen@lilypond.org>


  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 "skyline-pair.hh"

#include "international.hh"

using std::vector;

Skyline_pair::Skyline_pair ()
  : skylines_ (Skyline (DOWN), Skyline (UP))
{
}

Skyline_pair::Skyline_pair (vector<Box> const &boxes, Axis a)
  : skylines_ (Skyline (boxes, a, DOWN), Skyline (boxes, a, UP))
{
  // TODO: The boxes sort equally for up & down,
  // so we can save ourselves one sort step.
}

Skyline_pair::Skyline_pair (vector<Drul_array<Offset> > const &buildings, Axis a)
  : skylines_ (Skyline (buildings, a, DOWN), Skyline (buildings, a, UP))
{
}

Skyline_pair::Skyline_pair (vector<Skyline_pair> const &skypairs)
  : skylines_ (Skyline (skypairs, DOWN), Skyline (skypairs, UP))
{
}

Skyline_pair::Skyline_pair (Box const &b, Axis a)
  : skylines_ (Skyline (b, a, DOWN), Skyline (b, a, UP))
{
}

void
Skyline_pair::raise (Real r)
{
  skylines_[UP].raise (r);
  skylines_[DOWN].raise (r);
}

void
Skyline_pair::pad (Real r)
{
  if (!r)
    return;
  for (UP_and_DOWN (d))
    skylines_[d] = skylines_[d].padded (r);
}

void
Skyline_pair::shift (Real r)
{
  skylines_[UP].shift (r);
  skylines_[DOWN].shift (r);
}

void
Skyline_pair::merge (Skyline_pair const &other)
{
  skylines_[UP].merge (other[UP]);
  skylines_[DOWN].merge (other[DOWN]);
}

void
Skyline_pair::print () const
{
  skylines_[UP].print ();
  skylines_[DOWN].print ();
}

Real
Skyline_pair::left () const
{
  return std::min (skylines_[UP].left (), skylines_[DOWN].left ());
}

Real
Skyline_pair::right () const
{
  return std::max (skylines_[UP].right (), skylines_[DOWN].right ());
}

void
Skyline_pair::print_points () const
{
  skylines_[UP].print_points ();
  skylines_[DOWN].print_points ();
}

bool
Skyline_pair::is_empty () const
{
  return skylines_[UP].is_empty ()
         && skylines_[DOWN].is_empty ();
}

Skyline &
Skyline_pair::operator [] (Direction d)
{
  return skylines_[d];
}

Skyline const &
Skyline_pair::operator [] (Direction d) const
{
  return skylines_[d];
}

const char *const Skyline_pair::type_p_name_ = "ly:skyline-pair?";

MAKE_SCHEME_CALLBACK (Skyline_pair, skyline, 2);
SCM
Skyline_pair::skyline (SCM smob, SCM dir_scm)
{
  Skyline_pair *sp = unsmob<Skyline_pair> (smob);
  Direction dir = from_scm (dir_scm, UP);

  if (dir == CENTER)
    {
      warning (_f ("direction must not be CENTER in ly:skyline-pair::skyline"));
      dir = UP;
    }

  return (*sp)[dir].smobbed_copy ();
}
