/*************************************************************************/
/*  collision_object_bullet.h                                            */
/*************************************************************************/
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef COLLISION_OBJECT_BULLET_H
#define COLLISION_OBJECT_BULLET_H

#include "core/math/transform.h"
#include "core/math/vector3.h"
#include "core/object/class_db.h"
#include "core/templates/vset.h"
#include "shape_owner_bullet.h"

#include <LinearMath/btTransform.h>

/**
	@author AndreaCatania
*/

class AreaBullet;
class ShapeBullet;
class btCollisionObject;
class btCompoundShape;
class btCollisionShape;
class SpaceBullet;

class CollisionObjectBullet : public RIDBullet {
public:
	enum GodotObjectFlags {
		GOF_IS_MONITORING_AREA = 1 << 0
		// FLAG2 = 1 << 1,
		// FLAG3 = 1 << 2,
		// FLAG4 = 1 << 3,
		// FLAG5 = 1 << 4,
		// FLAG6 = 1 << 5
		// etc..
	};
	enum Type {
		TYPE_AREA = 0,
		TYPE_RIGID_BODY,
		TYPE_SOFT_BODY,
		TYPE_KINEMATIC_GHOST_BODY
	};

	struct ShapeWrapper {
		ShapeBullet *shape = nullptr;
		btCollisionShape *bt_shape = nullptr;
		btTransform transform;
		btVector3 scale;
		bool active = true;

		ShapeWrapper() {}

		ShapeWrapper(ShapeBullet *p_shape, const btTransform &p_transform, bool p_active) :
				shape(p_shape),
				active(p_active) {
			set_transform(p_transform);
		}

		ShapeWrapper(ShapeBullet *p_shape, const Transform3D &p_transform, bool p_active) :
				shape(p_shape),
				active(p_active) {
			set_transform(p_transform);
		}
		~ShapeWrapper();

		ShapeWrapper(const ShapeWrapper &otherShape) {
			operator=(otherShape);
		}

		void operator=(const ShapeWrapper &otherShape) {
			shape = otherShape.shape;
			bt_shape = otherShape.bt_shape;
			transform = otherShape.transform;
			scale = otherShape.scale;
			active = otherShape.active;
		}

		void set_transform(const Transform3D &p_transform);
		void set_transform(const btTransform &p_transform);
		btTransform get_adjusted_transform() const;

		void claim_bt_shape(const btVector3 &body_scale);
	};

protected:
	Type type = TYPE_AREA;
	ObjectID instance_id;
	uint32_t collisionLayer = 0;
	uint32_t collisionMask = 0;
	bool collisionsEnabled = true;
	bool m_isStatic = false;
	bool ray_pickable = false;
	btCollisionObject *bt_collision_object = nullptr;
	Vector3 body_scale = Vector3(1, 1, 1);
	bool force_shape_reset = false;
	SpaceBullet *space = nullptr;

	VSet<RID> exceptions;

	/// This array is used to know all areas where this Object is overlapped in
	/// New area is added when overlap with new area (AreaBullet::addOverlap), then is removed when it exit (CollisionObjectBullet::onExitArea)
	/// This array is used mainly to know which area hold the pointer of this object
	Vector<AreaBullet *> areasOverlapped;
	bool isTransformChanged = false;

public:
	CollisionObjectBullet(Type p_type);
	virtual ~CollisionObjectBullet();

	Type getType() { return type; }

protected:
	void destroyBulletCollisionObject();
	void setupBulletCollisionObject(btCollisionObject *p_collisionObject);

public:
	_FORCE_INLINE_ btCollisionObject *get_bt_collision_object() { return bt_collision_object; }

	_FORCE_INLINE_ void set_instance_id(const ObjectID &p_instance_id) { instance_id = p_instance_id; }
	_FORCE_INLINE_ ObjectID get_instance_id() const { return instance_id; }

	_FORCE_INLINE_ bool is_static() const { return m_isStatic; }

	_FORCE_INLINE_ void set_ray_pickable(bool p_enable) { ray_pickable = p_enable; }
	_FORCE_INLINE_ bool is_ray_pickable() const { return ray_pickable; }

	void set_body_scale(const Vector3 &p_new_scale);
	const Vector3 &get_body_scale() const { return body_scale; }
	btVector3 get_bt_body_scale() const;
	virtual void body_scale_changed();

	void add_collision_exception(const CollisionObjectBullet *p_ignoreCollisionObject);
	void remove_collision_exception(const CollisionObjectBullet *p_ignoreCollisionObject);
	bool has_collision_exception(const CollisionObjectBullet *p_otherCollisionObject) const;
	_FORCE_INLINE_ const VSet<RID> &get_exceptions() const { return exceptions; }

	_FORCE_INLINE_ void set_collision_layer(uint32_t p_layer) {
		if (collisionLayer != p_layer) {
			collisionLayer = p_layer;
			on_collision_filters_change();
		}
	}
	_FORCE_INLINE_ uint32_t get_collision_layer() const { return collisionLayer; }

	_FORCE_INLINE_ void set_collision_mask(uint32_t p_mask) {
		if (collisionMask != p_mask) {
			collisionMask = p_mask;
			on_collision_filters_change();
		}
	}
	_FORCE_INLINE_ uint32_t get_collision_mask() const { return collisionMask; }

	virtual void on_collision_filters_change() = 0;

	_FORCE_INLINE_ bool test_collision_mask(CollisionObjectBullet *p_other) const {
		return collisionLayer & p_other->collisionMask || p_other->collisionLayer & collisionMask;
	}

	virtual void reload_body() = 0;
	virtual void set_space(SpaceBullet *p_space) = 0;
	_FORCE_INLINE_ SpaceBullet *get_space() const { return space; }

	virtual void on_collision_checker_start() = 0;
	virtual void on_collision_checker_end() = 0;

	virtual void dispatch_callbacks() = 0;

	void set_collision_enabled(bool p_enabled);
	bool is_collisions_response_enabled();

	void notify_new_overlap(AreaBullet *p_area);
	virtual void on_enter_area(AreaBullet *p_area) = 0;
	virtual void on_exit_area(AreaBullet *p_area);

	void set_godot_object_flags(int flags);
	int get_godot_object_flags() const;

	void set_transform(const Transform3D &p_global_transform);
	Transform3D get_transform() const;
	virtual void set_transform__bullet(const btTransform &p_global_transform);
	virtual const btTransform &get_transform__bullet() const;

	bool is_transform_changed() const { return isTransformChanged; }
	virtual void notify_transform_changed();
};

class RigidCollisionObjectBullet : public CollisionObjectBullet, public ShapeOwnerBullet {
protected:
	btCollisionShape *mainShape = nullptr;
	Vector<ShapeWrapper> shapes;

public:
	RigidCollisionObjectBullet(Type p_type) :
			CollisionObjectBullet(p_type) {}
	~RigidCollisionObjectBullet();

	_FORCE_INLINE_ const Vector<ShapeWrapper> &get_shapes_wrappers() const { return shapes; }

	_FORCE_INLINE_ btCollisionShape *get_main_shape() const { return mainShape; }

	void add_shape(ShapeBullet *p_shape, const Transform3D &p_transform = Transform3D(), bool p_disabled = false);
	void set_shape(int p_index, ShapeBullet *p_shape);

	int get_shape_count() const;
	ShapeBullet *get_shape(int p_index) const;
	btCollisionShape *get_bt_shape(int p_index) const;

	int find_shape(ShapeBullet *p_shape) const;

	virtual void remove_shape_full(ShapeBullet *p_shape);
	void remove_shape_full(int p_index);
	void remove_all_shapes(bool p_permanentlyFromThisBody = false, bool p_force_not_reload = false);

	void set_shape_transform(int p_index, const Transform3D &p_transform);

	const btTransform &get_bt_shape_transform(int p_index) const;
	Transform3D get_shape_transform(int p_index) const;

	void set_shape_disabled(int p_index, bool p_disabled);
	bool is_shape_disabled(int p_index);

	virtual void shape_changed(int p_shape_index);
	virtual void reload_shapes();

	virtual void main_shape_changed() = 0;
	virtual void body_scale_changed();

private:
	void internal_shape_destroy(int p_index, bool p_permanentlyFromThisBody = false);
};

#endif