/*
 * This program 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 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#include "BLI_task.hh"

#include "BKE_spline.hh"

#include "node_geometry_util.hh"

namespace blender::nodes {

static void geo_node_curve_reverse_declare(NodeDeclarationBuilder &b)
{
  b.add_input<decl::Geometry>(N_("Curve"));
  b.add_input<decl::String>(N_("Selection"));
  b.add_output<decl::Geometry>(N_("Curve"));
}

static void geo_node_curve_reverse_exec(GeoNodeExecParams params)
{
  GeometrySet geometry_set = params.extract_input<GeometrySet>("Curve");
  geometry_set = bke::geometry_set_realize_instances(geometry_set);
  if (!geometry_set.has_curve()) {
    params.set_output("Curve", geometry_set);
    return;
  }

  /* Retrieve data for write access so we can avoid new allocations for the reversed data. */
  CurveComponent &curve_component = geometry_set.get_component_for_write<CurveComponent>();
  CurveEval &curve = *curve_component.get_for_write();
  MutableSpan<SplinePtr> splines = curve.splines();

  const std::string selection_name = params.extract_input<std::string>("Selection");
  VArray<bool> selection = curve_component.attribute_get_for_read(
      selection_name, ATTR_DOMAIN_CURVE, true);

  threading::parallel_for(splines.index_range(), 128, [&](IndexRange range) {
    for (const int i : range) {
      if (selection[i]) {
        splines[i]->reverse();
      }
    }
  });

  params.set_output("Curve", geometry_set);
}

}  // namespace blender::nodes

void register_node_type_geo_legacy_curve_reverse()
{
  static bNodeType ntype;
  geo_node_type_base(
      &ntype, GEO_NODE_LEGACY_CURVE_REVERSE, "Curve Reverse", NODE_CLASS_GEOMETRY, 0);
  ntype.declare = blender::nodes::geo_node_curve_reverse_declare;
  ntype.geometry_node_execute = blender::nodes::geo_node_curve_reverse_exec;
  nodeRegisterType(&ntype);
}