#include <cstdio>
#include <gmsh.h>

int main(int argc, char **argv)
{
  gmsh::initialize(argc, argv);

  // creates the FLTK user interface; this could also be called after the
  // geometry is created (or not at all - fltk.run() will do it automatically)
  gmsh::fltk::initialize();

  // Copied from boolean.cpp...
  gmsh::model::add("boolean");
  gmsh::option::setNumber("Mesh.Algorithm", 6);
  gmsh::option::setNumber("Mesh.MeshSizeMin", 0.4);
  gmsh::option::setNumber("Mesh.MeshSizeMax", 0.4);
  double R = 1.4, Rs = R * .7, Rt = R * 1.25;
  std::vector<std::pair<int, int> > ov;
  std::vector<std::vector<std::pair<int, int> > > ovv;
  gmsh::model::occ::addBox(-R, -R, -R, 2 * R, 2 * R, 2 * R, 1);
  gmsh::model::occ::addSphere(0, 0, 0, Rt, 2);
  gmsh::model::occ::intersect({{3, 1}}, {{3, 2}}, ov, ovv, 3);
  gmsh::model::occ::addCylinder(-2 * R, 0, 0, 4 * R, 0, 0, Rs, 4);
  gmsh::model::occ::addCylinder(0, -2 * R, 0, 0, 4 * R, 0, Rs, 5);
  gmsh::model::occ::addCylinder(0, 0, -2 * R, 0, 0, 4 * R, Rs, 6);
  gmsh::model::occ::fuse({{3, 4}, {3, 5}}, {{3, 6}}, ov, ovv, 7);
  gmsh::model::occ::cut({{3, 3}}, {{3, 7}}, ov, ovv, 8);
  gmsh::model::occ::synchronize();
  // ...end of copy

  // this would be equivalent to gmsh::fltk::run():
  //
  // gmsh::graphics::draw();
  // while(1){
  //   gmsh::fltk::wait();
  //   std::printf("just treated an event in the interface\n");
  // }

  gmsh::fltk::run();

  gmsh::finalize();
  return 0;
}
