// Copyright (c) 2014-2015 GeometryFactory (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.4/Mesh_2/include/CGAL/lloyd_optimize_mesh_2.h $
// $Id: lloyd_optimize_mesh_2.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Jane Tournois
//

#ifndef CGAL_LLOYD_OPTIMIZE_MESH_2_H
#define CGAL_LLOYD_OPTIMIZE_MESH_2_H

#include <CGAL/license/Mesh_2.h>

#include <CGAL/disable_warnings.h>

#include <CGAL/Mesh_2/Mesh_global_optimizer_2.h>
#include <CGAL/Mesh_2/Lloyd_move_2.h>
#include <CGAL/Mesh_2/Mesh_sizing_field.h>
#include <CGAL/Mesh_optimization_return_code.h>
#include <CGAL/iterator.h>
#include <CGAL/boost/parameter.h>
#include <boost/parameter/preprocessor.hpp>

#include <fstream>

// see <CGAL/config.h>
CGAL_PRAGMA_DIAG_PUSH
// see <CGAL/boost/parameter.h>
CGAL_IGNORE_BOOST_PARAMETER_NAME_WARNINGS


namespace CGAL
{

#if defined(BOOST_MSVC)
#  pragma warning(push)
#  pragma warning(disable:4003) // not enough actual parameters for macro
#endif

  BOOST_PARAMETER_FUNCTION(
  (Mesh_optimization_return_code),
  lloyd_optimize_mesh_2,
  parameters::tag,
  (required (in_out(cdt),*))
  (optional
    (max_iteration_number_, *, 0 )
    (convergence_, *, 0.001 )
    (time_limit_, *, 0. )
    (freeze_bound_, *, 0.001 )
    (seeds_begin_, *, CGAL::Emptyset_iterator())//see comments below
    (seeds_end_, *, CGAL::Emptyset_iterator())//see comments below
    (mark_, *, false) //if "false", seeds indicate "outside" regions
  )
  )
  {
    return lloyd_optimize_mesh_2_impl(cdt,
                                      max_iteration_number_,
                                      convergence_,
                                      freeze_bound_,
                                      time_limit_,
                                      seeds_begin_,
                                      seeds_end_,
                                      mark_);
  }

#if defined(BOOST_MSVC)
#  pragma warning(pop)
#endif

  /**
  * this partial specialization is a workaround
  * to avoid compilation errors when seeds_begin and seeds_end are
  * not initialized. Indeed, there is no way to have a
  * "default empty iterator" for these named parameters.
  * Emptyset_iterator implements OutputIterator,
  * but stands here for "any empty input iterator"
  * (and any other type could).
  */
  template<typename CDT>
  Mesh_optimization_return_code
  lloyd_optimize_mesh_2_impl(CDT& cdt,
                             const int max_iterations,
                             const double convergence_ratio,
                             const double freeze_bound,
                             const double time_limit,
                             CGAL::Emptyset_iterator,
                             CGAL::Emptyset_iterator,
                             const bool mark)
  {
    std::list<typename CDT::Point> seeds;
    return lloyd_optimize_mesh_2_impl(cdt, max_iterations, convergence_ratio,
      freeze_bound, time_limit, seeds.begin(), seeds.end(), mark);
  }

  template<typename CDT, typename InputIterator>
  Mesh_optimization_return_code
  lloyd_optimize_mesh_2_impl(CDT& cdt,
                             const int max_iterations,
                             const double convergence_ratio,
                             const double freeze_bound,
                             const double time_limit,
                             InputIterator seeds_begin,
                             InputIterator seeds_end,
                             const bool mark)
  {
    typedef Mesh_2::Mesh_sizing_field<CDT>           Sizing;
    typedef Mesh_2::Lloyd_move_2<CDT, Sizing>        Mv;
    typedef Mesh_2::Mesh_global_optimizer_2<CDT, Mv> Optimizer;

    Optimizer lloyd(cdt,
                    convergence_ratio,
                    freeze_bound);
    lloyd.set_time_limit(time_limit);
    lloyd.set_seeds(seeds_begin, seeds_end, mark);

#ifdef CGAL_MESH_2_OPTIMIZERS_DEBUG
    std::ofstream os("before_lloyd.angles.txt");
    lloyd.output_angles_histogram(os);
    os.close();
#endif

    // 1000 iteration max to avoid infinite loop
    int nb_iterations = (0 == max_iterations)
      ? 1000
      : max_iterations;

    //run optimization
    Mesh_optimization_return_code rc = lloyd(nb_iterations);

#ifdef CGAL_MESH_2_OPTIMIZERS_DEBUG
    std::ofstream os2("after_lloyd.angles.txt");
    lloyd.output_angles_histogram(os2);
    os2.close();
#endif

    return rc;
  }

} //end namespace CGAL

CGAL_PRAGMA_DIAG_POP

#include <CGAL/enable_warnings.h>

#endif
