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/**
 * @file att_estimator.cpp
 *
 * @author Thomas Gubler <thomasgubler@gmail.com>
 * @author Roman Bapst <romanbapst@yahoo.de>
*/

#include "attitude_estimator.h"

#include <px4/vehicle_attitude.h>
#include <mathlib/mathlib.h>
#include <platforms/px4_defines.h>
#include <platforms/px4_middleware.h>

AttitudeEstimator::AttitudeEstimator() :
	_n(),
	// _sub_modelstates(_n.subscribe("/gazebo/model_states", 1, &AttitudeEstimator::ModelStatesCallback, this)),
	_vehicle_attitude_pub(_n.advertise<px4::vehicle_attitude>("vehicle_attitude", 1))
{
	std::string vehicle_model;
	_n.param("vehicle_model", vehicle_model, std::string("iris"));
	_sub_imu = _n.subscribe("/" + vehicle_model + "/imu", 1, &AttitudeEstimator::ImuCallback, this);
}

void AttitudeEstimator::ModelStatesCallback(const gazebo_msgs::ModelStatesConstPtr &msg)
{
	px4::vehicle_attitude msg_v_att;

	/* Fill px4 attitude topic with contents from modelstates topic */

	/* Convert quaternion to rotation matrix */
	math::Quaternion quat;
	//XXX: search for ardrone or other (other than 'plane') vehicle here
	int index = 1;
	quat(0) = (float)msg->pose[index].orientation.w;
	quat(1) = (float)msg->pose[index].orientation.x;
	quat(2) = (float) - msg->pose[index].orientation.y;
	quat(3) = (float) - msg->pose[index].orientation.z;

	msg_v_att.q[0] = quat(0);
	msg_v_att.q[1] = quat(1);
	msg_v_att.q[2] = quat(2);
	msg_v_att.q[3] = quat(3);

	//XXX this is in inertial frame
	// msg_v_att.rollspeed = (float)msg->twist[index].angular.x;
	// msg_v_att.pitchspeed = -(float)msg->twist[index].angular.y;
	// msg_v_att.yawspeed = -(float)msg->twist[index].angular.z;

	msg_v_att.timestamp = px4::get_time_micros();
	_vehicle_attitude_pub.publish(msg_v_att);
}

void AttitudeEstimator::ImuCallback(const sensor_msgs::ImuConstPtr &msg)
{
	px4::vehicle_attitude msg_v_att;

	/* Fill px4 attitude topic with contents from modelstates topic */

	/* Convert quaternion to rotation matrix */
	math::Quaternion quat;
	//XXX: search for ardrone or other (other than 'plane') vehicle here
	int index = 1;
	quat(0) = (float)msg->orientation.w;
	quat(1) = (float)msg->orientation.x;
	quat(2) = (float) - msg->orientation.y;
	quat(3) = (float) - msg->orientation.z;

	msg_v_att.q[0] = quat(0);
	msg_v_att.q[1] = quat(1);
	msg_v_att.q[2] = quat(2);
	msg_v_att.q[3] = quat(3);

	msg_v_att.rollspeed = (float)msg->angular_velocity.x;
	msg_v_att.pitchspeed = -(float)msg->angular_velocity.y;
	msg_v_att.yawspeed = -(float)msg->angular_velocity.z;

	msg_v_att.timestamp = px4::get_time_micros();
	_vehicle_attitude_pub.publish(msg_v_att);
}


int main(int argc, char **argv)
{
	ros::init(argc, argv, "attitude_estimator");
	AttitudeEstimator m;

	ros::spin();

	return 0;
}
