/// -*- tab-width: 4; Mode: C++; c-basic-offset: 4; indent-tabs-mode: nil -*-

#ifndef __SITL_H__
#define __SITL_H__

#include <AP_Param.h>
#include <AP_Common.h>
#include <AP_Math.h>
#include <GCS_MAVLink.h>

struct sitl_fdm {
	// this is the packet sent by the simulator
	// to the APM executable to update the simulator state
	// All values are little-endian
	double latitude, longitude; // degrees
	double altitude;  // MSL
	double heading;   // degrees
	double speedN, speedE; // m/s
	double xAccel, yAccel, zAccel;       // m/s/s in body frame
	double rollRate, pitchRate, yawRate; // degrees/s/s in earth frame
	double rollDeg, pitchDeg, yawDeg;    // euler angles, degrees
	double airspeed; // m/s
	uint32_t magic; // 0x4c56414e
};


class SITL
{
public:
	SITL() {
		baro_noise  = 10;   // Pascals
		gyro_noise  = 30;   // degrees/s
		accel_noise = 3;    // m/s/s
		mag_noise   = 10;   // mag units
		aspd_noise  = 2;    // m/s
		drift_speed = 0.2;  // dps/min
		drift_time  = 5;    // minutes
        gps_delay   = 4;    // 0.8 seconds
	}
	struct sitl_fdm state;

	static const struct AP_Param::GroupInfo var_info[];

	// noise levels for simulated sensors
	AP_Float baro_noise;  // in Pascals
	AP_Float gyro_noise;  // in degrees/second
	AP_Float accel_noise; // in m/s/s
	AP_Float mag_noise;   // in mag units (earth field is 818)
	AP_Float aspd_noise;  // in m/s 

	AP_Float drift_speed; // degrees/second/minute
	AP_Float drift_time;  // period in minutes
	AP_Int8  gps_disable; // disable simulated GPS
	AP_Int8  gps_delay;   // delay in samples

	void simstate_send(mavlink_channel_t chan);

	// convert a set of roll rates from earth frame to body frame
	static void convert_body_frame(double rollDeg, double pitchDeg,
				       double rollRate, double pitchRate, double yawRate,
				       double *p, double *q, double *r);
};

#endif // __SITL_H__