/*************************************************************************/
/*  xr_nodes.h                                                           */
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#ifndef XR_NODES_H
#define XR_NODES_H

#include "scene/3d/camera_3d.h"
#include "servers/xr/xr_positional_tracker.h"

/*
	XRCamera is a subclass of camera which will register itself with its parent XROrigin and as a result is automatically positioned
*/

class XRCamera3D : public Camera3D {
	GDCLASS(XRCamera3D, Camera3D);

protected:
	// The name and pose for our HMD tracker is currently the only hardcoded bit.
	// If we ever are able to support multiple HMDs we may need to make this settable.
	StringName tracker_name = "head";
	StringName pose_name = "default";
	Ref<XRPositionalTracker> tracker;

	void _notification(int p_what);

	void _changed_tracker(const StringName p_tracker_name, int p_tracker_type);
	void _removed_tracker(const StringName p_tracker_name, int p_tracker_type);
	void _pose_changed(const Ref<XRPose> &p_pose);

public:
	TypedArray<String> get_configuration_warnings() const override;

	virtual Vector3 project_local_ray_normal(const Point2 &p_pos) const override;
	virtual Point2 unproject_position(const Vector3 &p_pos) const override;
	virtual Vector3 project_position(const Point2 &p_point, real_t p_z_depth) const override;
	virtual Vector<Plane> get_frustum() const override;

	XRCamera3D();
	~XRCamera3D();
};

/*
	XRNode3D is a helper node that implements binding to a tracker.

	It must be a child node of our XROrigin node
*/

class XRNode3D : public Node3D {
	GDCLASS(XRNode3D, Node3D);

private:
	StringName tracker_name;
	StringName pose_name = "default";
	bool is_active = true;

protected:
	Ref<XRPositionalTracker> tracker;

	static void _bind_methods();

	virtual void _bind_tracker();
	virtual void _unbind_tracker();
	void _changed_tracker(const StringName p_tracker_name, int p_tracker_type);
	void _removed_tracker(const StringName p_tracker_name, int p_tracker_type);

	void _pose_changed(const Ref<XRPose> &p_pose);

public:
	virtual void _validate_property(PropertyInfo &property) const override;
	void set_tracker(const StringName p_tracker_name);
	StringName get_tracker() const;

	void set_pose_name(const StringName p_pose);
	StringName get_pose_name() const;

	bool get_is_active() const;
	bool get_has_tracking_data() const;

	void trigger_haptic_pulse(const String &p_action_name, double p_frequency, double p_amplitude, double p_duration_sec, double p_delay_sec = 0);

	Ref<XRPose> get_pose();

	TypedArray<String> get_configuration_warnings() const override;

	XRNode3D();
	~XRNode3D();
};

/*
	XRController3D is a helper node that automatically updates its position based on tracker data.

	It must be a child node of our XROrigin node
*/

class XRController3D : public XRNode3D {
	GDCLASS(XRController3D, XRNode3D);

private:
protected:
	static void _bind_methods();

	virtual void _bind_tracker() override;
	virtual void _unbind_tracker() override;

	void _button_pressed(const String &p_name);
	void _button_released(const String &p_name);
	void _input_value_changed(const String &p_name, float p_value);
	void _input_axis_changed(const String &p_name, Vector2 p_value);

public:
	bool is_button_pressed(const StringName &p_name) const;
	float get_value(const StringName &p_name) const;
	Vector2 get_axis(const StringName &p_name) const;

	real_t get_rumble() const;
	void set_rumble(real_t p_rumble);

	XRPositionalTracker::TrackerHand get_tracker_hand() const;

	XRController3D() {}
	~XRController3D() {}
};

/*
	XRAnchor3D is a helper node that automatically updates its position based on anchor data, it represents a real world location.
	It must be a child node of our XROrigin3D node
*/

class XRAnchor3D : public XRNode3D {
	GDCLASS(XRAnchor3D, XRNode3D);

private:
	Vector3 size;

protected:
	static void _bind_methods();

public:
	Vector3 get_size() const;
	Plane get_plane() const;

	XRAnchor3D() {}
	~XRAnchor3D() {}
};

/*
	XROrigin3D is special spatial node that acts as our origin point mapping our real world center of our tracking volume into our virtual world.

	It is this point that you will move around the world as the player 'moves while standing still', i.e. the player moves through teleporting or controller inputs as opposed to physically moving.

	Our camera and controllers will always be child nodes and thus place relative to this origin point.
	This node will automatically locate any camera child nodes and update its position while our XRController3D node will handle tracked controllers.
*/

class XROrigin3D : public Node3D {
	GDCLASS(XROrigin3D, Node3D);

private:
	XRCamera3D *tracked_camera = nullptr;

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

public:
	TypedArray<String> get_configuration_warnings() const override;

	void set_tracked_camera(XRCamera3D *p_tracked_camera);
	XRCamera3D *get_tracked_camera() const;

	real_t get_world_scale() const;
	void set_world_scale(real_t p_world_scale);

	XROrigin3D() {}
	~XROrigin3D() {}
};

#endif // XR_NODES_H