/*************************************************************************/
/*  ray_cast.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 "ray_cast.h"

#include "servers/physics_server.h"
#include "collision_object.h"
void RayCast::set_cast_to(const Vector3& p_point) {

	cast_to=p_point;
	if (is_inside_tree() && (get_tree()->is_editor_hint() || get_tree()->is_debugging_collisions_hint()))
		update_gizmo();

}

Vector3 RayCast::get_cast_to() const{

	return cast_to;
}

void RayCast::set_layer_mask(uint32_t p_mask) {

	layer_mask=p_mask;
}

uint32_t RayCast::get_layer_mask() const {

	return layer_mask;
}

void RayCast::set_type_mask(uint32_t p_mask) {

	type_mask=p_mask;
}

uint32_t RayCast::get_type_mask() const {

	return type_mask;
}

bool RayCast::is_colliding() const{

	return collided;
}
Object *RayCast::get_collider() const{

	if (against==0)
		return NULL;

	return ObjectDB::get_instance(against);
}

int RayCast::get_collider_shape() const {

	return against_shape;
}
Vector3 RayCast::get_collision_point() const{

	return collision_point;
}
Vector3 RayCast::get_collision_normal() const{

	return collision_normal;
}


void RayCast::set_enabled(bool p_enabled) {

	enabled=p_enabled;
	if (is_inside_tree() && !get_tree()->is_editor_hint())
		set_fixed_process(p_enabled);
	if (!p_enabled)
		collided=false;

}


bool RayCast::is_enabled() const {


	return enabled;
}


void RayCast::_notification(int p_what) {

	switch(p_what) {

		case NOTIFICATION_ENTER_TREE: {

			if (enabled && !get_tree()->is_editor_hint()) {
				set_fixed_process(true);
			} else
				set_fixed_process(false);



		} break;
		case NOTIFICATION_EXIT_TREE: {

			if (enabled) {
				set_fixed_process(false);
			}


		} break;
		case NOTIFICATION_FIXED_PROCESS: {

			if (!enabled)
				break;

			_update_raycast_state();


		} break;
	}
}

void RayCast::_update_raycast_state(){
	Ref<World> w3d = get_world();
	ERR_FAIL_COND( w3d.is_null() );

	PhysicsDirectSpaceState *dss = PhysicsServer::get_singleton()->space_get_direct_state(w3d->get_space());
	ERR_FAIL_COND( !dss );

	Transform gt = get_global_transform();

	Vector3 to = cast_to;
	if (to==Vector3())
		to=Vector3(0,0.01,0);

	PhysicsDirectSpaceState::RayResult rr;

	if (dss->intersect_ray(gt.get_origin(),gt.xform(to),rr,exclude, layer_mask, type_mask)) {

		collided=true;
		against=rr.collider_id;
		collision_point=rr.position;
		collision_normal=rr.normal;
		against_shape=rr.shape;
	} else {
		collided=false;
	}
}

void RayCast::force_raycast_update() {
	_update_raycast_state();
}

void RayCast::add_exception_rid(const RID& p_rid) {

	exclude.insert(p_rid);
}

void RayCast::add_exception(const Object* p_object){

	ERR_FAIL_NULL(p_object);
	CollisionObject *co=((Object*)p_object)->cast_to<CollisionObject>();
	if (!co)
		return;
	add_exception_rid(co->get_rid());
}

void RayCast::remove_exception_rid(const RID& p_rid) {

	exclude.erase(p_rid);
}

void RayCast::remove_exception(const Object* p_object){

	ERR_FAIL_NULL(p_object);
	CollisionObject *co=((Object*)p_object)->cast_to<CollisionObject>();
	if (!co)
		return;
	remove_exception_rid(co->get_rid());
}


void RayCast::clear_exceptions(){

	exclude.clear();
}


void RayCast::_bind_methods() {


	ClassDB::bind_method(_MD("set_enabled","enabled"),&RayCast::set_enabled);
	ClassDB::bind_method(_MD("is_enabled"),&RayCast::is_enabled);

	ClassDB::bind_method(_MD("set_cast_to","local_point"),&RayCast::set_cast_to);
	ClassDB::bind_method(_MD("get_cast_to"),&RayCast::get_cast_to);

	ClassDB::bind_method(_MD("is_colliding"),&RayCast::is_colliding);
	ClassDB::bind_method(_MD("force_raycast_update"),&RayCast::force_raycast_update);

	ClassDB::bind_method(_MD("get_collider"),&RayCast::get_collider);
	ClassDB::bind_method(_MD("get_collider_shape"),&RayCast::get_collider_shape);
	ClassDB::bind_method(_MD("get_collision_point"),&RayCast::get_collision_point);
	ClassDB::bind_method(_MD("get_collision_normal"),&RayCast::get_collision_normal);

	ClassDB::bind_method(_MD("add_exception_rid","rid"),&RayCast::add_exception_rid);
	ClassDB::bind_method(_MD("add_exception","node"),&RayCast::add_exception);

	ClassDB::bind_method(_MD("remove_exception_rid","rid"),&RayCast::remove_exception_rid);
	ClassDB::bind_method(_MD("remove_exception","node"),&RayCast::remove_exception);

	ClassDB::bind_method(_MD("clear_exceptions"),&RayCast::clear_exceptions);

	ClassDB::bind_method(_MD("set_layer_mask","mask"),&RayCast::set_layer_mask);
	ClassDB::bind_method(_MD("get_layer_mask"),&RayCast::get_layer_mask);

	ClassDB::bind_method(_MD("set_type_mask","mask"),&RayCast::set_type_mask);
	ClassDB::bind_method(_MD("get_type_mask"),&RayCast::get_type_mask);

	ADD_PROPERTY(PropertyInfo(Variant::BOOL,"enabled"),_SCS("set_enabled"),_SCS("is_enabled"));
	ADD_PROPERTY(PropertyInfo(Variant::VECTOR3,"cast_to"),_SCS("set_cast_to"),_SCS("get_cast_to"));
	ADD_PROPERTY(PropertyInfo(Variant::INT,"layer_mask",PROPERTY_HINT_ALL_FLAGS),_SCS("set_layer_mask"),_SCS("get_layer_mask"));
	ADD_PROPERTY(PropertyInfo(Variant::INT,"type_mask",PROPERTY_HINT_FLAGS,"Static,Kinematic,Rigid,Character,Area"),_SCS("set_type_mask"),_SCS("get_type_mask"));
}

RayCast::RayCast() {

	enabled=false;
	against=0;
	collided=false;
	against_shape=0;
	layer_mask=1;
	type_mask=PhysicsDirectSpaceState::TYPE_MASK_COLLISION;
	cast_to=Vector3(0,-1,0);
}