#include "search.h"
#include <cassert>

search::search(int dim, int npoints, int *p) : dim(dim), npoints(npoints),
    best(1.), ha(dim, p), ps(dim, npoints) {
  assert(dim > 0);
  assert(npoints > 0);
}

void search::check() {
  // TODO adapter l'API pour ne pas recalculer la discrepancy
  double discr = ps.discrepancy();
  if(discr < best) {
    best = discr;
    FILE *f = fopen(filename.c_str(), "w");
    ps.dump(f);
    fclose(f);
  }
}

double search::run(int iterations) {
  _run(iterations);
  printf("Best discrepancy found after %d iterations : %g\nResult saved in %s\n", iterations, best, filename.c_str());
  return best;
}

random_search::random_search(int dim, int npoints, int *p) : search(dim, npoints, p) {
  filename = std::string("random_search");
}

void random_search::_run(int iterations) {
  for(int t = 0; t < iterations; t++) {
    // shuffle permutations
    for(int i = 0; i < dim; i++)
      ha.get_pi(i).random();

    // compute points
    for(int i = 0; i < npoints; i++)
      ha.compute(i+1, ps.point(i));

    // compute discrepancy and check if it is good
    check();
  }
}