#include <gudhi/Alpha_complex_3d.h>
#include <gudhi/Alpha_complex_3d_options.h>
// to construct a simplex_tree from alpha complex
#include <gudhi/Simplex_tree.h>

#include <iostream>
#include <string>
#include <vector>
#include <limits>  // for numeric limits

using Weighted_alpha_shapes_3d = Gudhi::alpha_complex::Weighted_alpha_shapes_3d;
using Weighted_alpha_complex_3d = Gudhi::alpha_complex::Alpha_complex_3d<Weighted_alpha_shapes_3d>;
using Point = Gudhi::alpha_complex::Weighted_alpha_shapes_3d::Point_3 ;
using Vector_of_points = std::vector<Point>;
using Vector_of_weights = std::vector<Gudhi::alpha_complex::Weighted_alpha_shapes_3d::Alpha_shape_3::FT>;

void usage(int nbArgs, char * const progName) {
  std::cerr << "Error: Number of arguments (" << nbArgs << ") is not correct\n";
  std::cerr << "Usage: " << progName << " \n";
  exit(-1);  // ----- >>
}

int main(int argc, char **argv) {
  if (argc != 1) {
    std::cerr << "Error: Number of arguments (" << argc << ") is not correct\n";
    std::cerr << "Usage: " << (argv[0] - 1) << " \n";
    exit(-1);  // ----- >>
  }

  // ----------------------------------------------------------------------------
  // Init of a list of points and weights from a small molecule
  // ----------------------------------------------------------------------------
  Vector_of_points points;
  Vector_of_weights weights;
  points.push_back(Point(1, -1, -1));
  weights.push_back(4.);
  points.push_back(Point(-1, 1, -1));
  weights.push_back(4.);
  points.push_back(Point(-1, -1, 1));
  weights.push_back(4.);
  points.push_back(Point(1, 1, 1));
  weights.push_back(4.);
  points.push_back(Point(2, 2, 2));
  weights.push_back(1.);

  // ----------------------------------------------------------------------------
  // Init of an alpha complex from the list of points
  // ----------------------------------------------------------------------------
  Weighted_alpha_complex_3d alpha_complex_from_points(points, weights);

  Gudhi::Simplex_tree<> simplex;
  if (alpha_complex_from_points.create_complex(simplex)) {
    // ----------------------------------------------------------------------------
    // Display information about the alpha complex
    // ----------------------------------------------------------------------------
    std::cout << "Alpha complex is of dimension " << simplex.dimension() <<
        " - " << simplex.num_simplices() << " simplices - " <<
        simplex.num_vertices() << " vertices." << std::endl;

    std::cout << "Iterator on alpha complex simplices in the filtration order, with [filtration value]:" << std::endl;
    for (auto f_simplex : simplex.filtration_simplex_range()) {
      std::cout << "   ( ";
      for (auto vertex : simplex.simplex_vertex_range(f_simplex)) {
        std::cout << vertex << " ";
      }
      std::cout << ") -> " << "[" << simplex.filtration(f_simplex) << "] ";
      std::cout << std::endl;
    }
  }
  return 0;
}