/* -*- mode: C -*-  */
/* 
   IGraph library.
   Copyright (C) 2012  Gabor Csardi <csardi.gabor@gmail.com>
   334 Harvard st, Cambridge MA, 02139 USA
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc.,  51 Franklin Street, Fifth Floor, Boston, MA 
   02110-1301 USA

*/

#include <igraph.h>

int main() {
  const igraph_real_t edges[] = { 0,1, 0,2, 1,6, 2,6, 1,3, 1,4, 1,5,
				  3,2, 4,2, 5,2 };
  igraph_t g;
  igraph_vector_t edgev;
  igraph_vector_ptr_t resvertices, resedges;
  igraph_vector_long_t predecessors, inbound_edges;
  int vcount, i;
  
  igraph_vector_view(&edgev, edges, sizeof(edges)/sizeof(igraph_real_t));
  vcount=igraph_vector_max(&edgev)+1;
  igraph_create(&g, &edgev, vcount, IGRAPH_DIRECTED);
  
  igraph_vector_ptr_init(&resvertices, vcount);
  igraph_vector_ptr_init(&resedges, vcount);
  igraph_vector_long_init(&predecessors, 0);
  igraph_vector_long_init(&inbound_edges, 0);
  
  for (i=0; i<vcount; i++) {
    igraph_vector_t *v1=malloc(sizeof(igraph_vector_t));
    igraph_vector_t *v2=malloc(sizeof(igraph_vector_t));
    if (!v1 || !v2) { 
      exit(2);
    }
    igraph_vector_init(v1, 0);
    igraph_vector_init(v2, 0);
    VECTOR(resvertices)[i] = v1;
    VECTOR(resedges)[i] = v2;
  }

  igraph_get_shortest_paths(&g, &resvertices, &resedges, /*from=*/ 0, 
			    /*to=*/ igraph_vss_all(), /*mode=*/ IGRAPH_OUT,
			    &predecessors, &inbound_edges);

  for (i=0; i<vcount; i++) {
    igraph_vector_t *v1=VECTOR(resvertices)[i];
    igraph_vector_t *v2=VECTOR(resedges)[i];
    printf("%i V: ", i); igraph_vector_print(v1);
    printf("%i E: ", i); igraph_vector_print(v2);
  }
  printf("pred: "); igraph_vector_long_print(&predecessors);
  printf("inbe: "); igraph_vector_long_print(&inbound_edges);

  igraph_vector_long_destroy(&inbound_edges);
  igraph_vector_long_destroy(&predecessors);
  for (i=0; i<vcount; i++) {
    igraph_vector_t *v1=VECTOR(resvertices)[i];
    igraph_vector_t *v2=VECTOR(resedges)[i];
    igraph_vector_destroy(v1);
    igraph_vector_destroy(v2);
    igraph_free(v1);
    igraph_free(v2);
  }
  igraph_vector_ptr_destroy(&resedges);
  igraph_vector_ptr_destroy(&resvertices);
  igraph_destroy(&g);

  return 0;
}