/*************************************************************************/
/*  broad_phase_basic.cpp                                                */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "broad_phase_basic.h"
#include "list.h"
#include "print_string.h"
BroadPhaseSW::ID BroadPhaseBasic::create(CollisionObjectSW *p_object_, int p_subindex) {

	if (p_object_==NULL) {

		ERR_FAIL_COND_V(p_object_==NULL,0);
	}

	current++;

	Element e;
	e.owner=p_object_;
	e._static=false;
	e.subindex=p_subindex;

	element_map[current]=e;
	return current;
}

void BroadPhaseBasic::move(ID p_id, const AABB& p_aabb) {

	Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND(!E);
	E->get().aabb=p_aabb;

}
void BroadPhaseBasic::set_static(ID p_id, bool p_static) {

	Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND(!E);
	E->get()._static=p_static;

}
void BroadPhaseBasic::remove(ID p_id) {

	Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND(!E);
	List<PairKey> to_erase;
	//unpair must be done immediately on removal to avoid potential invalid pointers
	for (Map<PairKey,void*>::Element *F=pair_map.front();F;F=F->next()) {

		if (F->key().a==p_id || F->key().b==p_id) {

			if (unpair_callback) {
				Element *elem_A=&element_map[F->key().a];
				Element *elem_B=&element_map[F->key().b];
				unpair_callback(elem_A->owner,elem_A->subindex,elem_B->owner,elem_B->subindex,F->get(),unpair_userdata);
			}
			to_erase.push_back(F->key());
		}
	}
	while(to_erase.size()) {

		pair_map.erase(to_erase.front()->get());
		to_erase.pop_front();
	}
	element_map.erase(E);

}

CollisionObjectSW *BroadPhaseBasic::get_object(ID p_id) const {

	const Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND_V(!E,NULL);
	return E->get().owner;

}
bool BroadPhaseBasic::is_static(ID p_id) const {

	const Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND_V(!E,false);
	return E->get()._static;

}
int BroadPhaseBasic::get_subindex(ID p_id) const {

	const Map<ID,Element>::Element *E=element_map.find(p_id);
	ERR_FAIL_COND_V(!E,-1);
	return E->get().subindex;
}

int BroadPhaseBasic::cull_segment(const Vector3& p_from, const Vector3& p_to,CollisionObjectSW** p_results,int p_max_results,int *p_result_indices) {

	int rc=0;

	for (Map<ID,Element>::Element *E=element_map.front();E;E=E->next()) {

		const AABB aabb=E->get().aabb;
		if (aabb.intersects_segment(p_from,p_to)) {

			p_results[rc]=E->get().owner;
			p_result_indices[rc]=E->get().subindex;
			rc++;
			if (rc>=p_max_results)
				break;
		}
	}

	return rc;

}
int BroadPhaseBasic::cull_aabb(const AABB& p_aabb,CollisionObjectSW** p_results,int p_max_results,int *p_result_indices) {

	int rc=0;

	for (Map<ID,Element>::Element *E=element_map.front();E;E=E->next()) {

		const AABB aabb=E->get().aabb;
		if (aabb.intersects(p_aabb)) {

			p_results[rc]=E->get().owner;
			p_result_indices[rc]=E->get().subindex;
			rc++;
			if (rc>=p_max_results)
				break;
		}
	}

	return rc;
}

void BroadPhaseBasic::set_pair_callback(PairCallback p_pair_callback,void *p_userdata) {

	pair_userdata=p_userdata;
	pair_callback=p_pair_callback;

}
void BroadPhaseBasic::set_unpair_callback(UnpairCallback p_pair_callback,void *p_userdata) {

	unpair_userdata=p_userdata;
	unpair_callback=p_pair_callback;

}

void BroadPhaseBasic::update() {

	// recompute pairs
	for(Map<ID,Element>::Element *I=element_map.front();I;I=I->next()) {

		for(Map<ID,Element>::Element *J=I->next();J;J=J->next()) {

			Element *elem_A=&I->get();
			Element *elem_B=&J->get();

			if (elem_A->owner == elem_B->owner)
				continue;


			bool pair_ok=elem_A->aabb.intersects( elem_B->aabb ) && (!elem_A->_static || !elem_B->_static );

			PairKey key(I->key(),J->key());

			Map<PairKey,void*>::Element *E=pair_map.find(key);

			if (!pair_ok && E) {
				if (unpair_callback)
					unpair_callback(elem_A->owner,elem_A->subindex,elem_B->owner,elem_B->subindex,E->get(),unpair_userdata);
				pair_map.erase(key);
			}

			if (pair_ok && !E) {

				void *data=NULL;
				if (pair_callback)
					data=pair_callback(elem_A->owner,elem_A->subindex,elem_B->owner,elem_B->subindex,unpair_userdata);
				pair_map.insert(key,data);
			}
		}
	}

}

BroadPhaseSW *BroadPhaseBasic::_create() {

	return memnew( BroadPhaseBasic );
}

BroadPhaseBasic::BroadPhaseBasic() {

	current=1;
	unpair_callback=NULL;
	unpair_userdata=NULL;
	pair_callback=NULL;
	pair_userdata=NULL;

}