/* -*- mode: C -*-  */
/*
   IGraph R package.
   Copyright (C) 2005-2012  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() {

    igraph_t g;
    FILE *input;

    /* Without names and weights */
    input = fopen("igraph_read_graph_lgl-1.lgl", "r");
    if (!input) {
        return 1;
    }
    igraph_read_graph_lgl(&g, input, 0, IGRAPH_ADD_WEIGHTS_NO, 1);
    fclose(input);
    if (!igraph_is_directed(&g)) {
        return 2;
    }
    igraph_write_graph_edgelist(&g, stdout);
    igraph_destroy(&g);

    /* With names and weights */
    input = fopen("igraph_read_graph_lgl-2.lgl", "r");
    if (!input) {
        return 3;
    }
    igraph_read_graph_lgl(&g, input, 0, IGRAPH_ADD_WEIGHTS_NO, 1);
    fclose(input);
    if (!igraph_is_directed(&g)) {
        return 4;
    }
    igraph_write_graph_ncol(&g, stdout, 0, 0);
    igraph_destroy(&g);

    /* Same graph, but forcing undirected mode */
    input = fopen("igraph_read_graph_lgl-2.lgl", "r");
    igraph_read_graph_lgl(&g, input, 0, IGRAPH_ADD_WEIGHTS_NO, 0);
    fclose(input);
    if (igraph_is_directed(&g)) {
        return 5;
    }
    igraph_write_graph_ncol(&g, stdout, 0, 0);
    igraph_destroy(&g);

    /* Erroneous LGL file (empty vertex name) */
    input = fopen("igraph_read_graph_lgl-3.lgl", "r");
    if (!input) {
        return 6;
    }
    igraph_set_error_handler(igraph_error_handler_ignore);
    if (igraph_read_graph_lgl(&g, input, 0, IGRAPH_ADD_WEIGHTS_NO, 1) !=
        IGRAPH_PARSEERROR) {
        return 7;
    }
    fclose(input);

    return 0;
}