#include "fracture.h"

bool break_edge(net_t *net, uint_t edge, cholmod_common *c) {
  net->fuses[edge] = true;
  net->num_broken++;

  double *x = (double *)net->boundary_cond->x;
  const graph_t *g = net->graph;

  uint_t v1 = net->graph->ev[2 * edge];
  uint_t v2 = net->graph->ev[2 * edge + 1];

  uint_t s1 = v1 < v2 ? v1 : v2;
  uint_t s2 = v1 < v2 ? v2 : v1;

  if (net->graph->boundary == TORUS_BOUND) {
    if (net->graph->bq[edge]) {
      double v1y = g->vx[2 * v1 + 1];
      double v2y = g->vx[2 * v2 + 1];
      uint_t ind = v1y < v2y ? 0 : 1;
      x[g->ev[2 * edge + ind]] -= 1;
      x[g->ev[2 * edge + !ind]] += 1;
    }
    if (net->factor != NULL) {
      factor_update(net->factor, s1, s2, c);
    }
  } else if (net->voltage_bound) {
    if (g->bq[v1] || g->bq[v2]) {
      uint_t vv = g->bq[v1] ? v2 : v1;
      uint_t uu = v1 == vv ? v2 : v1;
      if (is_in(g->bi[1], g->b, uu)) {
        x[g->bni[vv]] -= 1;
      }
      if (net->factor != NULL) {
        factor_update2(net->factor, g->bni[vv], c);
      }
    } else {
      if (net->factor != NULL) {
        factor_update(net->factor, g->bni[s1], g->bni[s2], c);
      }
    }
  } else {
    if (net->factor != NULL) {
      factor_update(net->factor, s1, s2, c);
    }
  }

  return true;
}