#include <CGAL/Exact_predicates_inexact_constructions_kernel.h>

#include <CGAL/Mesh_triangulation_3.h>
#include <CGAL/Mesh_complex_3_in_triangulation_3.h>
#include <CGAL/Mesh_criteria_3.h>

#include <CGAL/Surface_mesh.h>

#include <CGAL/Polyhedral_complex_mesh_domain_3.h>
#include <CGAL/make_mesh_3.h>
#include <cstdlib>
#include <cassert>

// Domain
typedef CGAL::Exact_predicates_inexact_constructions_kernel K;
//typedef CGAL::Mesh_polyhedron_3<K>::type Polyhedron;
typedef CGAL::Surface_mesh<K::Point_3> Face_graph;
typedef CGAL::Polyhedral_complex_mesh_domain_3<K, Face_graph> Mesh_domain;


#ifdef CGAL_CONCURRENT_MESH_3
typedef CGAL::Parallel_tag Concurrency_tag;
#else
typedef CGAL::Sequential_tag Concurrency_tag;
#endif

// Triangulation
typedef CGAL::Mesh_triangulation_3<Mesh_domain,K,Concurrency_tag>::type Tr;

typedef CGAL::Mesh_complex_3_in_triangulation_3<
  Tr,Mesh_domain::Corner_index,Mesh_domain::Curve_index>                C3t3;

// Criteria
typedef CGAL::Mesh_criteria_3<Tr> Mesh_criteria;

// To avoid verbose function and named parameters call
using namespace CGAL::parameters;

const char* const filenames[] = {
  "meshes/patch-01.off",
  "meshes/patch-13.off",
  "meshes/patch-20.off",
  "meshes/patch-21.off",
  "meshes/patch-23.off",
  "meshes/patch-30.off"
};

const std::pair<int, int> incident_subdomains[] = {
  std::make_pair(0, 1),
  std::make_pair(1, 3),
  std::make_pair(2, 0),
  std::make_pair(2, 1),
  std::make_pair(2, 3),
  std::make_pair(3, 0),
};

int main()
{
#ifdef CGAL_MESHING_STEPS_WITH_CIN
  char in_char;
  std::cout << "Ready for loading the data ? (y or n)";
  std::cin >> in_char;
  if (in_char == 'n') return 0;
#endif

  const std::size_t nb_patches = sizeof(filenames) / sizeof(const char*);
  assert(sizeof(incident_subdomains) ==
         nb_patches * sizeof(std::pair<int, int>));
  std::vector<Face_graph> patches(nb_patches);
  for(std::size_t i = 0; i < nb_patches; ++i) {
    std::ifstream input(CGAL::data_file_path(filenames[i]));
    if(!(input >> patches[i])) {
      std::cerr << "Error reading " << CGAL::data_file_path(filenames[i]) << " as a polyhedron!\n";
      return EXIT_FAILURE;
    }
  }

#ifdef CGAL_MESHING_STEPS_WITH_CIN
  std::cout << "Ready for building the domain ? (y or n)";
  std::cin >> in_char;
  if (in_char == 'n') return 0;
#endif

  // Create domain
  Mesh_domain domain(patches.begin(), patches.end(),
                     incident_subdomains, incident_subdomains+nb_patches);

#ifdef CGAL_MESHING_STEPS_WITH_CIN
  std::cout << "Ready for feature detection ? (y or n)";
  std::cin >> in_char;
  if (in_char == 'n') return 0;
#endif

  domain.detect_features(); //includes detection of borders

  // Mesh criteria
  Mesh_criteria criteria(edge_size = 8,
                         facet_angle = 25, facet_size = 8, facet_distance = 0.2,
                         cell_radius_edge_ratio = 3, cell_size = 10);

#ifdef CGAL_MESHING_STEPS_WITH_CIN
  std::cout << "Ready for mesh generation ? (y or n)";
  std::cin >> in_char;
  if (in_char == 'n') return 0;
#endif

  // Mesh generation
  C3t3 c3t3 = CGAL::make_mesh_3<C3t3>(domain, criteria);

  //// Output
  //std::ofstream medit_file("out.mesh");
  //c3t3.output_to_medit(medit_file);

  return EXIT_SUCCESS;
}
