/* $Id: node.c,v 1.6 2011/01/25 16:30:49 ellson Exp $ $Revision: 1.6 $ */
/* vim:set shiftwidth=4 ts=8: */

/*************************************************************************
 * Copyright (c) 2011 AT&T Intellectual Property 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: See CVS logs. Details at http://www.graphviz.org/
 *************************************************************************/

#include <limits.h>

#include "libgraph.h"

#ifdef DMALLOC
#include "dmalloc.h"
#endif

Agnode_t *agfindnode(Agraph_t * g, char *name)
{
    Agnode_t *rv;

    rv = (Agnode_t *) dtmatch(g->univ->node_dict, name);
    if (rv && (g != g->root))
	rv = (Agnode_t *) dtsearch(g->nodes, rv);
    return rv;
}

Agnode_t *agidnode(Agraph_t * g, int index)
{
    Agnode_t *rv;
    rv = (Agnode_t *) dtmatch(g->nodes, &index);
    return rv;
}

Agnode_t *agnode(Agraph_t * g, char *name)
{
    Agnode_t *n;
    if ((n = agfindnode(g->root, name)) == NULL) {
	n = agNEWnode(g, name, g->proto->n);
	dtinsert(g->univ->node_dict, n);
    }
    agINSnode(g, n);
    return n;
}

void agINSnode(Agraph_t * g, Agnode_t * n)
{
    Agraph_t *meta;
    Agedge_t *e;

    if (agidnode(g, n->id))
	return;
    dtinsert(g->nodes, n);
    if (AG_IS_METAGRAPH(g) == FALSE) {
	meta = g->meta_node->graph;
	for (e = agfstin(meta, g->meta_node); e; e = agnxtin(meta, e))
	    agINSnode(agusergraph(e->tail), n);
    }
}

void agDELnode(Agraph_t * g, Agnode_t * n)
{
    Agedge_t *e, *f;
    Agraph_t *meta, *h;

    for (e = agfstedge(g, n); e; e = f) {
	f = agnxtedge(g, e, n);
	agDELedge(g, e);
    }

    if (AG_IS_METAGRAPH(g) == FALSE) {
	meta = g->meta_node->graph;
	for (e = agfstout(meta, g->meta_node); e; e = agnxtout(meta, e)) {
	    h = agusergraph(e->head);
	    if (dtsearch(h->nodes, n))
		agDELnode(h, n);
	}
    }
    dtdelete(g->nodes, n);
    if (g == g->root)
	agFREEnode(n);
}

Agnode_t *agfstnode(Agraph_t * g)
{
    return (Agnode_t *) dtfirst(g->nodes);
}

Agnode_t *agnxtnode(Agraph_t * g, Agnode_t * n)
{
    return (Agnode_t *) dtnext(g->nodes, n);
}

Agnode_t *aglstnode(Agraph_t * g)
{
    return (Agnode_t *) dtlast(g->nodes);
}

Agnode_t *agprvnode(Agraph_t * g, Agnode_t * n)
{
    return (Agnode_t *) dtprev(g->nodes, n);
}

Agnode_t *agNEWnode(Agraph_t * subg, char *name, Agnode_t * proto)
{
    int i, nobj;
    Agnode_t *n;

    n = (Agnode_t *) calloc(1, AG.node_nbytes);
    n->tag = TAG_NODE;
    n->name = agstrdup(name);
    n->id = subg->univ->max_node_id++;
    n->graph = subg->root;
    nobj = dtsize(subg->univ->nodeattr->dict);
    if (nobj) {
		n->attr = N_NEW(nobj, char *);
		n->didset = N_NEW((nobj + CHAR_BIT - 1) / CHAR_BIT, char);
	}
    else {
		n->attr = NULL;
		n->didset = NULL;
	}
    for (i = 0; i < nobj; i++)
		n->attr[i] = agstrdup(proto ? proto->attr[i] :
			subg->univ->nodeattr->list[i]->value);
    return n;
}

void agFREEnode(Agnode_t * n)
{
    int i, nobj;
    Agdict_t *dict = agdictof(n);

    dict = dict;
    dtdelete(n->graph->univ->node_dict, n);
    TAG_OF(n) = -1;
    agstrfree(n->name);
    if (AG_IS_METAGRAPH(n->graph) == FALSE) {
	nobj = dtsize(n->graph->univ->nodeattr->dict);
	for (i = 0; i < nobj; i++)
	    agstrfree(n->attr[i]);
    }
    free(n->attr);
	free(n->didset);
    free(n);
}
