/*************************************************************************/
/*  area_bullet.cpp                                                      */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "area_bullet.h"

#include "bullet_physics_server.h"
#include "bullet_types_converter.h"
#include "bullet_utilities.h"
#include "collision_object_bullet.h"
#include "space_bullet.h"

#include <BulletCollision/CollisionDispatch/btGhostObject.h>
#include <btBulletCollisionCommon.h>

AreaBullet::AreaBullet() :
		RigidCollisionObjectBullet(CollisionObjectBullet::TYPE_AREA) {
	btGhost = bulletnew(btGhostObject);
	reload_shapes();
	setupBulletCollisionObject(btGhost);
	/// Collision objects with a callback still have collision response with dynamic rigid bodies.
	/// In order to use collision objects as trigger, you have to disable the collision response.
	set_collision_enabled(false);

	for (int i = 0; i < 5; ++i) {
		call_event_res_ptr[i] = &call_event_res[i];
	}
}

AreaBullet::~AreaBullet() {
	// signal are handled by godot, so just clear without notify
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		overlapping_shapes[i].other_object->on_exit_area(this);
	}
}

void AreaBullet::dispatch_callbacks() {
	if (!isScratched) {
		return;
	}
	isScratched = false;

	// Reverse order so items can be removed.
	for (int i = overlapping_shapes.size() - 1; i >= 0; i--) {
		OverlappingShapeData &overlapping_shape = overlapping_shapes.write[i];

		switch (overlapping_shape.state) {
			case OVERLAP_STATE_ENTER:
				overlapping_shape.state = OVERLAP_STATE_INSIDE;
				call_event(overlapping_shape, PhysicsServer3D::AREA_BODY_ADDED);
				if (_overlapping_shape_count(overlapping_shape.other_object) == 1) {
					// This object's first shape being added.
					overlapping_shape.other_object->on_enter_area(this);
				}
				break;
			case OVERLAP_STATE_EXIT:
				call_event(overlapping_shape, PhysicsServer3D::AREA_BODY_REMOVED);
				if (_overlapping_shape_count(overlapping_shape.other_object) == 1) {
					// This object's last shape being removed.
					overlapping_shape.other_object->on_exit_area(this);
				}
				overlapping_shapes.remove_at(i); // Remove after callback
				break;
			case OVERLAP_STATE_INSIDE: {
				if (overlapping_shape.other_object->getType() == TYPE_RIGID_BODY) {
					RigidBodyBullet *body = static_cast<RigidBodyBullet *>(overlapping_shape.other_object);
					body->scratch_space_override_modificator();
				}
				break;
			}
			case OVERLAP_STATE_DIRTY:
				break;
		}
	}
}

void AreaBullet::call_event(const OverlappingShapeData &p_overlapping_shape, PhysicsServer3D::AreaBodyStatus p_status) {
	InOutEventCallback &event = eventsCallbacks[static_cast<int>(p_overlapping_shape.other_object->getType())];

	if (!event.event_callback.is_valid()) {
		event.event_callback = Callable();
		return;
	}

	call_event_res[0] = p_status;
	call_event_res[1] = p_overlapping_shape.other_object->get_self(); // RID
	call_event_res[2] = p_overlapping_shape.other_object->get_instance_id(); // Object ID
	call_event_res[3] = p_overlapping_shape.other_shape_id; // Other object's shape ID
	call_event_res[4] = p_overlapping_shape.our_shape_id; // This area's shape ID

	Callable::CallError outResp;
	Variant ret;
	event.event_callback.call((const Variant **)call_event_res, 5, ret, outResp);
}

int AreaBullet::_overlapping_shape_count(CollisionObjectBullet *p_other_object) {
	int count = 0;
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		if (overlapping_shapes[i].other_object == p_other_object) {
			count++;
		}
	}
	return count;
}

int AreaBullet::_find_overlapping_shape(CollisionObjectBullet *p_other_object, uint32_t p_other_shape_id, uint32_t p_our_shape_id) {
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		const OverlappingShapeData &overlapping_shape = overlapping_shapes[i];
		if (overlapping_shape.other_object == p_other_object && overlapping_shape.other_shape_id == p_other_shape_id && overlapping_shape.our_shape_id == p_our_shape_id) {
			return i;
		}
	}
	return -1;
}

void AreaBullet::mark_all_overlaps_dirty() {
	OverlappingShapeData *overlapping_shapes_w = overlapping_shapes.ptrw();
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		// Don't overwrite OVERLAP_STATE_ENTER state.
		if (overlapping_shapes_w[i].state != OVERLAP_STATE_ENTER) {
			overlapping_shapes_w[i].state = OVERLAP_STATE_DIRTY;
		}
	}
}

void AreaBullet::mark_object_overlaps_inside(CollisionObjectBullet *p_other_object) {
	OverlappingShapeData *overlapping_shapes_w = overlapping_shapes.ptrw();
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		if (overlapping_shapes_w[i].other_object == p_other_object && overlapping_shapes_w[i].state == OVERLAP_STATE_DIRTY) {
			overlapping_shapes_w[i].state = OVERLAP_STATE_INSIDE;
		}
	}
}

void AreaBullet::set_overlap(CollisionObjectBullet *p_other_object, uint32_t p_other_shape_id, uint32_t p_our_shape_id) {
	int i = _find_overlapping_shape(p_other_object, p_other_shape_id, p_our_shape_id);
	if (i == -1) { // Not found, create new one.
		OverlappingShapeData overlapping_shape(p_other_object, OVERLAP_STATE_ENTER, p_other_shape_id, p_our_shape_id);
		overlapping_shapes.push_back(overlapping_shape);
		p_other_object->notify_new_overlap(this);
		isScratched = true;
	} else {
		overlapping_shapes.ptrw()[i].state = OVERLAP_STATE_INSIDE;
	}
}

void AreaBullet::mark_all_dirty_overlaps_as_exit() {
	OverlappingShapeData *overlapping_shapes_w = overlapping_shapes.ptrw();
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		if (overlapping_shapes[i].state == OVERLAP_STATE_DIRTY) {
			overlapping_shapes_w[i].state = OVERLAP_STATE_EXIT;
			isScratched = true;
		}
	}
}

void AreaBullet::remove_object_overlaps(CollisionObjectBullet *p_object) {
	// Reverse order so items can be removed.
	for (int i = overlapping_shapes.size() - 1; i >= 0; i--) {
		if (overlapping_shapes[i].other_object == p_object) {
			overlapping_shapes.remove_at(i);
		}
	}
}

void AreaBullet::clear_overlaps() {
	for (int i = 0; i < overlapping_shapes.size(); i++) {
		call_event(overlapping_shapes[i], PhysicsServer3D::AREA_BODY_REMOVED);
		overlapping_shapes[i].other_object->on_exit_area(this);
	}
	overlapping_shapes.clear();
}

void AreaBullet::set_monitorable(bool p_monitorable) {
	monitorable = p_monitorable;
	updated = true;
}

bool AreaBullet::is_monitoring() const {
	return get_godot_object_flags() & GOF_IS_MONITORING_AREA;
}

void AreaBullet::main_shape_changed() {
	CRASH_COND(!get_main_shape());
	btGhost->setCollisionShape(get_main_shape());
	updated = true;
}

void AreaBullet::reload_body() {
	if (space) {
		space->remove_area(this);
		space->add_area(this);
	}
}

void AreaBullet::set_space(SpaceBullet *p_space) {
	// Clear the old space if there is one
	if (space) {
		clear_overlaps();
		isScratched = false;

		// Remove this object form the physics world
		space->remove_area(this);
	}

	space = p_space;

	if (space) {
		space->add_area(this);
	}
}

void AreaBullet::on_collision_filters_change() {
	if (space) {
		space->reload_collision_filters(this);
	}
	updated = true;
}

void AreaBullet::set_param(PhysicsServer3D::AreaParameter p_param, const Variant &p_value) {
	switch (p_param) {
		case PhysicsServer3D::AREA_PARAM_GRAVITY:
			set_spOv_gravityMag(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_VECTOR:
			set_spOv_gravityVec(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_LINEAR_DAMP:
			set_spOv_linearDump(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_ANGULAR_DAMP:
			set_spOv_angularDump(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_PRIORITY:
			set_spOv_priority(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_IS_POINT:
			set_spOv_gravityPoint(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_DISTANCE_SCALE:
			set_spOv_gravityPointDistanceScale(p_value);
			break;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_POINT_ATTENUATION:
			set_spOv_gravityPointAttenuation(p_value);
			break;
		default:
			WARN_PRINT("Area doesn't support this parameter in the Bullet backend: " + itos(p_param));
	}
	isScratched = true;
}

Variant AreaBullet::get_param(PhysicsServer3D::AreaParameter p_param) const {
	switch (p_param) {
		case PhysicsServer3D::AREA_PARAM_GRAVITY:
			return spOv_gravityMag;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_VECTOR:
			return spOv_gravityVec;
		case PhysicsServer3D::AREA_PARAM_LINEAR_DAMP:
			return spOv_linearDump;
		case PhysicsServer3D::AREA_PARAM_ANGULAR_DAMP:
			return spOv_angularDump;
		case PhysicsServer3D::AREA_PARAM_PRIORITY:
			return spOv_priority;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_IS_POINT:
			return spOv_gravityPoint;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_DISTANCE_SCALE:
			return spOv_gravityPointDistanceScale;
		case PhysicsServer3D::AREA_PARAM_GRAVITY_POINT_ATTENUATION:
			return spOv_gravityPointAttenuation;
		default:
			WARN_PRINT("Area doesn't support this parameter in the Bullet backend: " + itos(p_param));
			return Variant();
	}
}

void AreaBullet::set_event_callback(Type p_callbackObjectType, const Callable &p_callback) {
	InOutEventCallback &ev = eventsCallbacks[static_cast<int>(p_callbackObjectType)];
	ev.event_callback = p_callback;

	/// Set if monitoring
	if (!eventsCallbacks[0].event_callback.is_null() || !eventsCallbacks[1].event_callback.is_null()) {
		set_godot_object_flags(get_godot_object_flags() | GOF_IS_MONITORING_AREA);
	} else {
		set_godot_object_flags(get_godot_object_flags() & (~GOF_IS_MONITORING_AREA));
		clear_overlaps();
	}
}

bool AreaBullet::has_event_callback(Type p_callbackObjectType) {
	return !eventsCallbacks[static_cast<int>(p_callbackObjectType)].event_callback.is_null();
}

void AreaBullet::on_enter_area(AreaBullet *p_area) {
}

void AreaBullet::on_exit_area(AreaBullet *p_area) {
	CollisionObjectBullet::on_exit_area(p_area);
}