/*************************************************************************/
/*  physics_body_3d.h                                                    */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef PHYSICS_BODY_3D_H
#define PHYSICS_BODY_3D_H

#include "core/vset.h"
#include "scene/3d/collision_object_3d.h"
#include "scene/resources/physics_material.h"
#include "servers/physics_server_3d.h"
#include "skeleton_3d.h"

class PhysicsBody3D : public CollisionObject3D {

	GDCLASS(PhysicsBody3D, CollisionObject3D);

	uint32_t collision_layer;
	uint32_t collision_mask;

	void _set_layers(uint32_t p_mask);
	uint32_t _get_layers() const;

protected:
	static void _bind_methods();
	PhysicsBody3D(PhysicsServer3D::BodyMode p_mode);

public:
	virtual Vector3 get_linear_velocity() const;
	virtual Vector3 get_angular_velocity() const;
	virtual float get_inverse_mass() const;

	void set_collision_layer(uint32_t p_layer);
	uint32_t get_collision_layer() const;

	void set_collision_mask(uint32_t p_mask);
	uint32_t get_collision_mask() const;

	void set_collision_layer_bit(int p_bit, bool p_value);
	bool get_collision_layer_bit(int p_bit) const;

	void set_collision_mask_bit(int p_bit, bool p_value);
	bool get_collision_mask_bit(int p_bit) const;

	Array get_collision_exceptions();
	void add_collision_exception_with(Node *p_node); //must be physicsbody
	void remove_collision_exception_with(Node *p_node);

	PhysicsBody3D();
};

class StaticBody3D : public PhysicsBody3D {

	GDCLASS(StaticBody3D, PhysicsBody3D);

	Vector3 constant_linear_velocity;
	Vector3 constant_angular_velocity;

	Ref<PhysicsMaterial> physics_material_override;

protected:
	static void _bind_methods();

public:
	void set_physics_material_override(const Ref<PhysicsMaterial> &p_physics_material_override);
	Ref<PhysicsMaterial> get_physics_material_override() const;

	void set_constant_linear_velocity(const Vector3 &p_vel);
	void set_constant_angular_velocity(const Vector3 &p_vel);

	Vector3 get_constant_linear_velocity() const;
	Vector3 get_constant_angular_velocity() const;

	StaticBody3D();
	~StaticBody3D();

private:
	void _reload_physics_characteristics();
};

class RigidBody3D : public PhysicsBody3D {

	GDCLASS(RigidBody3D, PhysicsBody3D);

public:
	enum Mode {
		MODE_RIGID,
		MODE_STATIC,
		MODE_CHARACTER,
		MODE_KINEMATIC,
	};

protected:
	bool can_sleep;
	PhysicsDirectBodyState3D *state;
	Mode mode;

	real_t mass;
	Ref<PhysicsMaterial> physics_material_override;

	Vector3 linear_velocity;
	Vector3 angular_velocity;
	real_t gravity_scale;
	real_t linear_damp;
	real_t angular_damp;

	bool sleeping;
	bool ccd;

	int max_contacts_reported;

	bool custom_integrator;

	struct ShapePair {

		int body_shape;
		int local_shape;
		bool tagged;
		bool operator<(const ShapePair &p_sp) const {
			if (body_shape == p_sp.body_shape)
				return local_shape < p_sp.local_shape;
			else
				return body_shape < p_sp.body_shape;
		}

		ShapePair() {}
		ShapePair(int p_bs, int p_ls) {
			body_shape = p_bs;
			local_shape = p_ls;
			tagged = false;
		}
	};
	struct RigidBody3D_RemoveAction {

		ObjectID body_id;
		ShapePair pair;
	};
	struct BodyState {

		//int rc;
		bool in_tree;
		VSet<ShapePair> shapes;
	};

	struct ContactMonitor {

		bool locked;
		Map<ObjectID, BodyState> body_map;
	};

	ContactMonitor *contact_monitor;
	void _body_enter_tree(ObjectID p_id);
	void _body_exit_tree(ObjectID p_id);

	void _body_inout(int p_status, ObjectID p_instance, int p_body_shape, int p_local_shape);
	virtual void _direct_state_changed(Object *p_state);

	void _notification(int p_what);
	static void _bind_methods();

public:
	void set_mode(Mode p_mode);
	Mode get_mode() const;

	void set_mass(real_t p_mass);
	real_t get_mass() const;

	virtual float get_inverse_mass() const { return 1.0 / mass; }

	void set_weight(real_t p_weight);
	real_t get_weight() const;

	void set_physics_material_override(const Ref<PhysicsMaterial> &p_physics_material_override);
	Ref<PhysicsMaterial> get_physics_material_override() const;

	void set_linear_velocity(const Vector3 &p_velocity);
	Vector3 get_linear_velocity() const;

	void set_axis_velocity(const Vector3 &p_axis);

	void set_angular_velocity(const Vector3 &p_velocity);
	Vector3 get_angular_velocity() const;

	void set_gravity_scale(real_t p_gravity_scale);
	real_t get_gravity_scale() const;

	void set_linear_damp(real_t p_linear_damp);
	real_t get_linear_damp() const;

	void set_angular_damp(real_t p_angular_damp);
	real_t get_angular_damp() const;

	void set_use_custom_integrator(bool p_enable);
	bool is_using_custom_integrator();

	void set_sleeping(bool p_sleeping);
	bool is_sleeping() const;

	void set_can_sleep(bool p_active);
	bool is_able_to_sleep() const;

	void set_contact_monitor(bool p_enabled);
	bool is_contact_monitor_enabled() const;

	void set_max_contacts_reported(int p_amount);
	int get_max_contacts_reported() const;

	void set_use_continuous_collision_detection(bool p_enable);
	bool is_using_continuous_collision_detection() const;

	void set_axis_lock(PhysicsServer3D::BodyAxis p_axis, bool p_lock);
	bool get_axis_lock(PhysicsServer3D::BodyAxis p_axis) const;

	Array get_colliding_bodies() const;

	void add_central_force(const Vector3 &p_force);
	void add_force(const Vector3 &p_force, const Vector3 &p_pos);
	void add_torque(const Vector3 &p_torque);

	void apply_central_impulse(const Vector3 &p_impulse);
	void apply_impulse(const Vector3 &p_pos, const Vector3 &p_impulse);
	void apply_torque_impulse(const Vector3 &p_impulse);

	virtual String get_configuration_warning() const;

	RigidBody3D();
	~RigidBody3D();

private:
	void _reload_physics_characteristics();
};

VARIANT_ENUM_CAST(RigidBody3D::Mode);

class KinematicCollision3D;

class KinematicBody3D : public PhysicsBody3D {

	GDCLASS(KinematicBody3D, PhysicsBody3D);

public:
	struct Collision {
		Vector3 collision;
		Vector3 normal;
		Vector3 collider_vel;
		ObjectID collider;
		RID collider_rid;
		int collider_shape;
		Variant collider_metadata;
		Vector3 remainder;
		Vector3 travel;
		int local_shape;
	};

private:
	Vector3 linear_velocity;
	Vector3 angular_velocity;

	uint16_t locked_axis;

	float margin;

	Vector3 floor_normal;
	Vector3 floor_velocity;
	RID on_floor_body;
	bool on_floor;
	bool on_ceiling;
	bool on_wall;
	Vector<Collision> colliders;
	Vector<Ref<KinematicCollision3D>> slide_colliders;
	Ref<KinematicCollision3D> motion_cache;

	_FORCE_INLINE_ bool _ignores_mode(PhysicsServer3D::BodyMode) const;

	Ref<KinematicCollision3D> _move(const Vector3 &p_motion, bool p_infinite_inertia = true, bool p_exclude_raycast_shapes = true, bool p_test_only = false);
	Ref<KinematicCollision3D> _get_slide_collision(int p_bounce);

protected:
	void _notification(int p_what);
	static void _bind_methods();

	virtual void _direct_state_changed(Object *p_state);

public:
	virtual Vector3 get_linear_velocity() const;
	virtual Vector3 get_angular_velocity() const;

	bool move_and_collide(const Vector3 &p_motion, bool p_infinite_inertia, Collision &r_collision, bool p_exclude_raycast_shapes = true, bool p_test_only = false);
	bool test_move(const Transform &p_from, const Vector3 &p_motion, bool p_infinite_inertia);

	bool separate_raycast_shapes(bool p_infinite_inertia, Collision &r_collision);

	void set_axis_lock(PhysicsServer3D::BodyAxis p_axis, bool p_lock);
	bool get_axis_lock(PhysicsServer3D::BodyAxis p_axis) const;

	void set_safe_margin(float p_margin);
	float get_safe_margin() const;

	Vector3 move_and_slide(const Vector3 &p_linear_velocity, const Vector3 &p_up_direction = Vector3(0, 0, 0), bool p_stop_on_slope = false, int p_max_slides = 4, float p_floor_max_angle = Math::deg2rad((float)45), bool p_infinite_inertia = true);
	Vector3 move_and_slide_with_snap(const Vector3 &p_linear_velocity, const Vector3 &p_snap, const Vector3 &p_up_direction = Vector3(0, 0, 0), bool p_stop_on_slope = false, int p_max_slides = 4, float p_floor_max_angle = Math::deg2rad((float)45), bool p_infinite_inertia = true);
	bool is_on_floor() const;
	bool is_on_wall() const;
	bool is_on_ceiling() const;
	Vector3 get_floor_normal() const;
	Vector3 get_floor_velocity() const;

	int get_slide_count() const;
	Collision get_slide_collision(int p_bounce) const;

	KinematicBody3D();
	~KinematicBody3D();
};

class KinematicCollision3D : public Reference {

	GDCLASS(KinematicCollision3D, Reference);

	KinematicBody3D *owner;
	friend class KinematicBody3D;
	KinematicBody3D::Collision collision;

protected:
	static void _bind_methods();

public:
	Vector3 get_position() const;
	Vector3 get_normal() const;
	Vector3 get_travel() const;
	Vector3 get_remainder() const;
	Object *get_local_shape() const;
	Object *get_collider() const;
	ObjectID get_collider_id() const;
	Object *get_collider_shape() const;
	int get_collider_shape_index() const;
	Vector3 get_collider_velocity() const;
	Variant get_collider_metadata() const;

	KinematicCollision3D();
};

class PhysicalBone3D : public PhysicsBody3D {

	GDCLASS(PhysicalBone3D, PhysicsBody3D);

public:
	enum JointType {
		JOINT_TYPE_NONE,
		JOINT_TYPE_PIN,
		JOINT_TYPE_CONE,
		JOINT_TYPE_HINGE,
		JOINT_TYPE_SLIDER,
		JOINT_TYPE_6DOF
	};

	struct JointData {
		virtual JointType get_joint_type() { return JOINT_TYPE_NONE; }

		/// "j" is used to set the parameter inside the PhysicsServer3D
		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		virtual ~JointData() {}
	};

	struct PinJointData : public JointData {
		virtual JointType get_joint_type() { return JOINT_TYPE_PIN; }

		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		real_t bias;
		real_t damping;
		real_t impulse_clamp;

		PinJointData() :
				bias(0.3),
				damping(1.),
				impulse_clamp(0) {}
	};

	struct ConeJointData : public JointData {
		virtual JointType get_joint_type() { return JOINT_TYPE_CONE; }

		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		real_t swing_span;
		real_t twist_span;
		real_t bias;
		real_t softness;
		real_t relaxation;

		ConeJointData() :
				swing_span(Math_PI * 0.25),
				twist_span(Math_PI),
				bias(0.3),
				softness(0.8),
				relaxation(1.) {}
	};

	struct HingeJointData : public JointData {
		virtual JointType get_joint_type() { return JOINT_TYPE_HINGE; }

		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		bool angular_limit_enabled;
		real_t angular_limit_upper;
		real_t angular_limit_lower;
		real_t angular_limit_bias;
		real_t angular_limit_softness;
		real_t angular_limit_relaxation;

		HingeJointData() :
				angular_limit_enabled(false),
				angular_limit_upper(Math_PI * 0.5),
				angular_limit_lower(-Math_PI * 0.5),
				angular_limit_bias(0.3),
				angular_limit_softness(0.9),
				angular_limit_relaxation(1.) {}
	};

	struct SliderJointData : public JointData {
		virtual JointType get_joint_type() { return JOINT_TYPE_SLIDER; }

		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		real_t linear_limit_upper;
		real_t linear_limit_lower;
		real_t linear_limit_softness;
		real_t linear_limit_restitution;
		real_t linear_limit_damping;
		real_t angular_limit_upper;
		real_t angular_limit_lower;
		real_t angular_limit_softness;
		real_t angular_limit_restitution;
		real_t angular_limit_damping;

		SliderJointData() :
				linear_limit_upper(1.),
				linear_limit_lower(-1.),
				linear_limit_softness(1.),
				linear_limit_restitution(0.7),
				linear_limit_damping(1.),
				angular_limit_upper(0),
				angular_limit_lower(0),
				angular_limit_softness(1.),
				angular_limit_restitution(0.7),
				angular_limit_damping(1.) {}
	};

	struct SixDOFJointData : public JointData {
		struct SixDOFAxisData {
			bool linear_limit_enabled;
			real_t linear_limit_upper;
			real_t linear_limit_lower;
			real_t linear_limit_softness;
			real_t linear_restitution;
			real_t linear_damping;
			bool linear_spring_enabled;
			real_t linear_spring_stiffness;
			real_t linear_spring_damping;
			real_t linear_equilibrium_point;
			bool angular_limit_enabled;
			real_t angular_limit_upper;
			real_t angular_limit_lower;
			real_t angular_limit_softness;
			real_t angular_restitution;
			real_t angular_damping;
			real_t erp;
			bool angular_spring_enabled;
			real_t angular_spring_stiffness;
			real_t angular_spring_damping;
			real_t angular_equilibrium_point;

			SixDOFAxisData() :
					linear_limit_enabled(true),
					linear_limit_upper(0),
					linear_limit_lower(0),
					linear_limit_softness(0.7),
					linear_restitution(0.5),
					linear_damping(1.),
					linear_spring_enabled(false),
					linear_spring_stiffness(0),
					linear_spring_damping(0),
					linear_equilibrium_point(0),
					angular_limit_enabled(true),
					angular_limit_upper(0),
					angular_limit_lower(0),
					angular_limit_softness(0.5),
					angular_restitution(0),
					angular_damping(1.),
					erp(0.5),
					angular_spring_enabled(false),
					angular_spring_stiffness(0),
					angular_spring_damping(0.),
					angular_equilibrium_point(0) {}
		};

		virtual JointType get_joint_type() { return JOINT_TYPE_6DOF; }

		virtual bool _set(const StringName &p_name, const Variant &p_value, RID j = RID());
		virtual bool _get(const StringName &p_name, Variant &r_ret) const;
		virtual void _get_property_list(List<PropertyInfo> *p_list) const;

		SixDOFAxisData axis_data[3];

		SixDOFJointData() {}
	};

private:
#ifdef TOOLS_ENABLED
	// if false gizmo move body
	bool gizmo_move_joint;
#endif

	JointData *joint_data;
	Transform joint_offset;
	RID joint;

	Skeleton3D *parent_skeleton;
	Transform body_offset;
	Transform body_offset_inverse;
	bool simulate_physics;
	bool _internal_simulate_physics;
	int bone_id;

	String bone_name;
	real_t bounce;
	real_t mass;
	real_t friction;
	real_t gravity_scale;

protected:
	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;
	void _notification(int p_what);
	void _direct_state_changed(Object *p_state);

	static void _bind_methods();

private:
	static Skeleton3D *find_skeleton_parent(Node *p_parent);

	void _fix_joint_offset();
	void _reload_joint();

public:
	void _on_bone_parent_changed();
	void _set_gizmo_move_joint(bool p_move_joint);

public:
#ifdef TOOLS_ENABLED
	virtual Transform get_global_gizmo_transform() const;
	virtual Transform get_local_gizmo_transform() const;
#endif

	const JointData *get_joint_data() const;
	Skeleton3D *find_skeleton_parent();

	int get_bone_id() const { return bone_id; }

	void set_joint_type(JointType p_joint_type);
	JointType get_joint_type() const;

	void set_joint_offset(const Transform &p_offset);
	const Transform &get_joint_offset() const;

	void set_body_offset(const Transform &p_offset);
	const Transform &get_body_offset() const;

	void set_simulate_physics(bool p_simulate);
	bool get_simulate_physics();
	bool is_simulating_physics();

	void set_bone_name(const String &p_name);
	const String &get_bone_name() const;

	void set_mass(real_t p_mass);
	real_t get_mass() const;

	void set_weight(real_t p_weight);
	real_t get_weight() const;

	void set_friction(real_t p_friction);
	real_t get_friction() const;

	void set_bounce(real_t p_bounce);
	real_t get_bounce() const;

	void set_gravity_scale(real_t p_gravity_scale);
	real_t get_gravity_scale() const;

	void apply_central_impulse(const Vector3 &p_impulse);
	void apply_impulse(const Vector3 &p_pos, const Vector3 &p_impulse);

	void reset_physics_simulation_state();
	void reset_to_rest_position();

	PhysicalBone3D();
	~PhysicalBone3D();

private:
	void update_bone_id();
	void update_offset();

	void _start_physics_simulation();
	void _stop_physics_simulation();
};

VARIANT_ENUM_CAST(PhysicalBone3D::JointType);

#endif // PHYSICS_BODY__H