/* igraph library.
   Copyright (C) 2007-2022  The igraph development team <igraph@igraph.org>

   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, see <https://www.gnu.org/licenses/>.
*/

#include <igraph.h>

int main(void) {

    igraph_t g;
    igraph_vector_t y;
    igraph_warning_handler_t* oldwarnhandler;

    /* Initialize the library. */
    igraph_setup();

    /* Turn on attribute handling. */
    igraph_set_attribute_table(&igraph_cattribute_table);

    /* Create a graph, add some attributes and save it as a GraphML file. */
    igraph_famous(&g, "Petersen");
    SETGAS(&g, "name", "Petersen's graph");
    SETGAN(&g, "vertices", igraph_vcount(&g));
    SETGAN(&g, "edges", igraph_ecount(&g));
    SETGAB(&g, "famous", true);

    igraph_vector_init_range(&y, 1, igraph_vcount(&g) + 1);
    SETVANV(&g, "id", &y);
    igraph_vector_destroy(&y);

    SETVAS(&g, "name", 0, "foo");
    SETVAS(&g, "name", 1, "foobar");

    SETVAB(&g, "is_first", 0, true);

    igraph_vector_init_range(&y, 1, igraph_ecount(&g) + 1);
    SETEANV(&g, "id", &y);
    igraph_vector_destroy(&y);

    SETEAS(&g, "name", 0, "FOO");
    SETEAS(&g, "name", 1, "FOOBAR");

    SETEAB(&g, "is_first", 0, true);

    /* Turn off the warning handler temporarily because the GML writer will
     * print warnings about boolean attributes being converted to numbers, and
     * we don't care about these. */
    oldwarnhandler = igraph_set_warning_handler(igraph_warning_handler_ignore);
    igraph_write_graph_gml(&g, stdout, IGRAPH_WRITE_GML_DEFAULT_SW, 0, "");
    igraph_set_warning_handler(oldwarnhandler);

    /* Back to business. */
    igraph_write_graph_graphml(&g, stdout, /*prefixattr=*/ true);

    igraph_destroy(&g);

    return 0;
}