/*************************************************************************/
/*  arkit_interface.h                                                    */
/*************************************************************************/
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#ifndef ARKIT_INTERFACE_H
#define ARKIT_INTERFACE_H

#include "servers/arvr/arvr_interface.h"
#include "servers/arvr/arvr_positional_tracker.h"
#include "servers/camera/camera_feed.h"

/**
	@author Bastiaan Olij <mux213@gmail.com>

	ARKit interface between iPhone and Godot
*/

// forward declaration for some needed objects
class ARKitShader;

#ifdef __OBJC__
typedef NSObject GodotARAnchor;
#else
typedef void GodotARAnchor;
#endif

class ARKitInterface : public ARVRInterface {
	GDCLASS(ARKitInterface, ARVRInterface);

private:
	bool initialized;
	bool session_was_started;
	bool plane_detection_is_enabled;
	bool light_estimation_is_enabled;
	real_t ambient_intensity;
	real_t ambient_color_temperature;

	Transform transform;
	CameraMatrix projection;
	float eye_height, z_near, z_far;

	Ref<CameraFeed> feed;
	int image_width[2];
	int image_height[2];
	PoolVector<uint8_t> img_data[2];

	struct anchor_map {
		ARVRPositionalTracker *tracker;
		unsigned char uuid[16];
	};

	///@TODO should use memory map object from Godot?
	unsigned int num_anchors;
	unsigned int max_anchors;
	anchor_map *anchors;
	ARVRPositionalTracker *get_anchor_for_uuid(const unsigned char *p_uuid);
	void remove_anchor_for_uuid(const unsigned char *p_uuid);
	void remove_all_anchors();

protected:
	static void _bind_methods();

public:
	void start_session();
	void stop_session();

	bool get_anchor_detection_is_enabled() const;
	void set_anchor_detection_is_enabled(bool p_enable);
	virtual int get_camera_feed_id();

	bool get_light_estimation_is_enabled() const;
	void set_light_estimation_is_enabled(bool p_enable);

	real_t get_ambient_intensity() const;
	real_t get_ambient_color_temperature() const;

	/* while Godot has its own raycast logic this takes ARKits camera into account and hits on any ARAnchor */
	Array raycast(Vector2 p_screen_coord);

	void notification(int p_what);

	virtual StringName get_name() const;
	virtual int get_capabilities() const;

	virtual bool is_initialized() const;
	virtual bool initialize();
	virtual void uninitialize();

	virtual Size2 get_render_targetsize();
	virtual bool is_stereo();
	virtual Transform get_transform_for_eye(ARVRInterface::Eyes p_eye, const Transform &p_cam_transform);
	virtual CameraMatrix get_projection_for_eye(ARVRInterface::Eyes p_eye, real_t p_aspect, real_t p_z_near, real_t p_z_far);
	virtual void commit_for_eye(ARVRInterface::Eyes p_eye, RID p_render_target, const Rect2 &p_screen_rect);

	virtual void process();

	// called by delegate (void * because C++ and Obj-C don't always mix, should really change all platform/iphone/*.cpp files to .mm)
	void _add_or_update_anchor(GodotARAnchor *p_anchor);
	void _remove_anchor(GodotARAnchor *p_anchor);

	ARKitInterface();
	~ARKitInterface();
};

#endif /* !ARKIT_INTERFACE_H */