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/*
 * 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.
 *
 * The Original Code is Copyright (C) 2015 Blender Foundation.
 * All rights reserved.
 */

/** \file \ingroup depsgraph
 */

#include "intern/builder/deg_builder_pchanmap.h"

#include <stdio.h>
#include <string.h>

#include "BLI_utildefines.h"
#include "BLI_ghash.h"

namespace DEG {

static void free_rootpchanmap_valueset(void *val)
{
	/* Just need to free the set itself - the names stored are all references. */
	GSet *values = (GSet *)val;
	BLI_gset_free(values, NULL);
}

RootPChanMap::RootPChanMap()
{
	/* Just create empty map. */
	map_ = BLI_ghash_str_new("RootPChanMap");
}

RootPChanMap::~RootPChanMap()
{
	/* Free the map, and all the value sets. */
	BLI_ghash_free(map_, NULL, free_rootpchanmap_valueset);
}

/* Debug contents of map */
void RootPChanMap::print_debug()
{
	GHashIterator it1;
	GSetIterator it2;

	printf("Root PChan Map:\n");
	GHASH_ITER(it1, map_) {
		const char *item = (const char *)BLI_ghashIterator_getKey(&it1);
		GSet *values = (GSet *)BLI_ghashIterator_getValue(&it1);

		printf("  %s : { ", item);
		GSET_ITER(it2, values) {
			const char *val = (const char *)BLI_gsetIterator_getKey(&it2);
			printf("%s, ", val);
		}
		printf("}\n");
	}
}

/* Add a mapping. */
void RootPChanMap::add_bone(const char *bone, const char *root)
{
	if (BLI_ghash_haskey(map_, bone)) {
		/* Add new entry, but only add the root if it doesn't already
		 * exist in there. */
		GSet *values = (GSet *)BLI_ghash_lookup(map_, bone);
		BLI_gset_add(values, (void *)root);
	}
	else {
		/* Create new set and mapping. */
		GSet *values = BLI_gset_new(BLI_ghashutil_strhash_p,
		                            BLI_ghashutil_strcmp,
		                            "RootPChanMap Value Set");
		BLI_ghash_insert(map_, (void *)bone, (void *)values);

		/* Add new entry now. */
		BLI_gset_insert(values, (void *)root);
	}
}

/* Check if there's a common root bone between two bones. */
bool RootPChanMap::has_common_root(const char *bone1, const char *bone2)
{
	/* Ensure that both are in the map... */
	if (BLI_ghash_haskey(map_, bone1) == false) {
		//fprintf("RootPChanMap: bone1 '%s' not found (%s => %s)\n", bone1, bone1, bone2);
		//print_debug();
		return false;
	}

	if (BLI_ghash_haskey(map_, bone2) == false) {
		//fprintf("RootPChanMap: bone2 '%s' not found (%s => %s)\n", bone2, bone1, bone2);
		//print_debug();
		return false;
	}

	GSet *bone1_roots = (GSet *)BLI_ghash_lookup(map_, (void *)bone1);
	GSet *bone2_roots = (GSet *)BLI_ghash_lookup(map_, (void *)bone2);

	GSetIterator it1, it2;
	GSET_ITER(it1, bone1_roots) {
		GSET_ITER(it2, bone2_roots) {
			const char *v1 = (const char *)BLI_gsetIterator_getKey(&it1);
			const char *v2 = (const char *)BLI_gsetIterator_getKey(&it2);

			if (strcmp(v1, v2) == 0) {
				//fprintf("RootPchanMap: %s in common for %s => %s\n", v1, bone1, bone2);
				return true;
			}
		}
	}

	//fprintf("RootPChanMap: No common root found (%s => %s)\n", bone1, bone2);
	return false;
}

}  // namespace DEG