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/// @file calibration_routines.h
///	@authot Don Gagne <don@thegagnes.com>

/**
 * Least-squares fit of a sphere to a set of points.
 *
 * Fits a sphere to a set of points on the sphere surface.
 *
 * @param x point coordinates on the X axis
 * @param y point coordinates on the Y axis
 * @param z point coordinates on the Z axis
 * @param size number of points
 * @param max_iterations abort if maximum number of iterations have been reached. If unsure, set to 100.
 * @param delta abort if error is below delta. If unsure, set to 0 to run max_iterations times.
 * @param sphere_x coordinate of the sphere center on the X axis
 * @param sphere_y coordinate of the sphere center on the Y axis
 * @param sphere_z coordinate of the sphere center on the Z axis
 * @param sphere_radius sphere radius
 *
 * @return 0 on success, 1 on failure
 */
int sphere_fit_least_squares(const float x[], const float y[], const float z[],
			     unsigned int size, unsigned int max_iterations, float delta, float *sphere_x, float *sphere_y, float *sphere_z,
			     float *sphere_radius);

// FIXME: Change the name
static const unsigned max_accel_sens = 3;

// The order of these cannot change since the calibration calculations depend on them in this order
enum detect_orientation_return {
	DETECT_ORIENTATION_TAIL_DOWN,
	DETECT_ORIENTATION_NOSE_DOWN,
	DETECT_ORIENTATION_LEFT,
	DETECT_ORIENTATION_RIGHT,
	DETECT_ORIENTATION_UPSIDE_DOWN,
	DETECT_ORIENTATION_RIGHTSIDE_UP,
	DETECT_ORIENTATION_ERROR
};
static const unsigned detect_orientation_side_count = 6;

/// Wait for vehicle to become still and detect it's orientation
///	@return Returns detect_orientation_return according to orientation when vehicle
///		and ready for measurements
enum detect_orientation_return detect_orientation(int	mavlink_fd,			///< Mavlink fd to write output to
						  int	cancel_sub,			///< Cancel subscription from calibration_cancel_subscribe
						  int	accel_sub,			///< Orb subcription to accel sensor
						  bool	lenient_still_detection);	///< true: Use more lenient still position detection

/// Returns the human readable string representation of the orientation
///	@param orientation Orientation to return string for, "error" if buffer is too small
const char* detect_orientation_str(enum detect_orientation_return orientation);

enum calibrate_return {
	calibrate_return_ok,
	calibrate_return_error,
	calibrate_return_cancelled
};

typedef calibrate_return (*calibration_from_orientation_worker_t)(detect_orientation_return	orientation,	///< Orientation which was detected
								  int				cancel_sub,	///< Cancel subscription from calibration_cancel_subscribe
								  void*				worker_data);	///< Opaque worker data

/// Perform calibration sequence which require a rest orientation detection prior to calibration.
///	@return OK: Calibration succeeded, ERROR: Calibration failed
calibrate_return calibrate_from_orientation(int		mavlink_fd,						///< Mavlink fd to write output to
					    int		cancel_sub,						///< Cancel subscription from calibration_cancel_subscribe
					    bool	side_data_collected[detect_orientation_side_count],	///< Sides for which data still needs calibration
					    calibration_from_orientation_worker_t calibration_worker,		///< Worker routine which performs the actual calibration
					    void*	worker_data,						///< Opaque data passed to worker routine
					    bool	lenient_still_detection);				///< true: Use more lenient still position detection

/// Called at the beginning of calibration in order to subscribe to the cancel command
///	@return Handle to vehicle_command subscription
int calibrate_cancel_subscribe(void);

/// Called to cancel the subscription to the cancel command
///	@param cancel_sub Cancel subcription from calibration_cancel_subscribe
void calibrate_cancel_unsubscribe(int cancel_sub);

/// Used to periodically check for a cancel command
bool calibrate_cancel_check(int mavlink_fd,	///< Mavlink fd for output
			    int cancel_sub);	///< Cancel subcription fromcalibration_cancel_subscribe