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/**
 * @file commander.cpp
 * Dummy commander node that publishes the various status topics
 *
 * @author Thomas Gubler <thomasgubler@gmail.com>
*/

#include "commander.h"

#include <platforms/px4_middleware.h>

Commander::Commander() :
	_n(),
	_man_ctrl_sp_sub(_n.subscribe("manual_control_setpoint", 10, &Commander::ManualControlInputCallback, this)),
	_offboard_control_mode_sub(_n.subscribe("offboard_control_mode", 10, &Commander::OffboardControlModeCallback, this)),
	_vehicle_control_mode_pub(_n.advertise<px4::vehicle_control_mode>("vehicle_control_mode", 10)),
	_actuator_armed_pub(_n.advertise<px4::actuator_armed>("actuator_armed", 10)),
	_vehicle_status_pub(_n.advertise<px4::vehicle_status>("vehicle_status", 10)),
	_parameter_update_pub(_n.advertise<px4::parameter_update>("parameter_update", 10)),
	_msg_parameter_update(),
	_msg_actuator_armed(),
	_msg_vehicle_control_mode(),
	_msg_vehicle_status(),
	_msg_offboard_control_mode(),
	_got_manual_control(false)
{

	/* Default to offboard control: when no joystick is connected offboard control should just work */

}

void Commander::ManualControlInputCallback(const px4::manual_control_setpointConstPtr &msg)
{
	_got_manual_control = true;

	/* fill vehicle control mode based on (faked) stick positions*/
	EvalSwitches(msg, _msg_vehicle_status, _msg_vehicle_control_mode);
	_msg_vehicle_control_mode.timestamp = px4::get_time_micros();

	/* fill actuator armed */
	float arm_th = 0.95;
	_msg_actuator_armed.timestamp = px4::get_time_micros();

	if (_msg_actuator_armed.armed) {
		/* Check for disarm */
		if (msg->r < -arm_th && msg->z < (1 - arm_th)) {
			_msg_actuator_armed.armed = false;
			_msg_vehicle_control_mode.flag_armed = false;
			_msg_vehicle_status.arming_state = _msg_vehicle_status.ARMING_STATE_STANDBY;
		}

	} else {
		/* Check for arm */
		if (msg->r > arm_th && msg->z < (1 - arm_th)) {
			_msg_actuator_armed.armed = true;
			_msg_vehicle_control_mode.flag_armed = true;
			_msg_vehicle_status.arming_state = _msg_vehicle_status.ARMING_STATE_ARMED;
		}
	}

	/* fill vehicle status */
	_msg_vehicle_status.timestamp = px4::get_time_micros();
	_msg_vehicle_status.hil_state = _msg_vehicle_status.HIL_STATE_OFF;
	_msg_vehicle_status.hil_state = _msg_vehicle_status.VEHICLE_TYPE_QUADROTOR;
	_msg_vehicle_status.is_rotary_wing = true;

	_vehicle_control_mode_pub.publish(_msg_vehicle_control_mode);
	_actuator_armed_pub.publish(_msg_actuator_armed);
	_vehicle_status_pub.publish(_msg_vehicle_status);

	/* Fill parameter update */
	if (px4::get_time_micros() - _msg_parameter_update.timestamp > 1e6) {
		_msg_parameter_update.timestamp = px4::get_time_micros();
		_parameter_update_pub.publish(_msg_parameter_update);
	}
}

void Commander::SetOffboardControl(const px4::offboard_control_mode &msg_offboard_control_mode,
			px4::vehicle_control_mode &msg_vehicle_control_mode)
{
	msg_vehicle_control_mode.flag_control_manual_enabled = false;
	msg_vehicle_control_mode.flag_control_offboard_enabled = true;
	msg_vehicle_control_mode.flag_control_auto_enabled = false;

	msg_vehicle_control_mode.flag_control_rates_enabled = !msg_offboard_control_mode.ignore_bodyrate ||
		!msg_offboard_control_mode.ignore_attitude ||
		!msg_offboard_control_mode.ignore_position ||
		!msg_offboard_control_mode.ignore_velocity ||
		!msg_offboard_control_mode.ignore_acceleration_force;

	msg_vehicle_control_mode.flag_control_attitude_enabled = !msg_offboard_control_mode.ignore_attitude ||
		!msg_offboard_control_mode.ignore_position ||
		!msg_offboard_control_mode.ignore_velocity ||
		!msg_offboard_control_mode.ignore_acceleration_force;


	msg_vehicle_control_mode.flag_control_velocity_enabled = !msg_offboard_control_mode.ignore_velocity ||
		!msg_offboard_control_mode.ignore_position;

	msg_vehicle_control_mode.flag_control_climb_rate_enabled = !msg_offboard_control_mode.ignore_velocity ||
		!msg_offboard_control_mode.ignore_position;

	msg_vehicle_control_mode.flag_control_position_enabled = !msg_offboard_control_mode.ignore_position;

	msg_vehicle_control_mode.flag_control_altitude_enabled = !msg_offboard_control_mode.ignore_position;
}

void Commander::EvalSwitches(const px4::manual_control_setpointConstPtr &msg,
		px4::vehicle_status &msg_vehicle_status,
		px4::vehicle_control_mode &msg_vehicle_control_mode) {
	// XXX this is a minimal implementation. If more advanced functionalities are
	// needed consider a full port of the commander


	if (msg->offboard_switch == px4::manual_control_setpoint::SWITCH_POS_ON)
	{
		SetOffboardControl(_msg_offboard_control_mode, msg_vehicle_control_mode);
		return;
	}

	msg_vehicle_control_mode.flag_control_offboard_enabled = false;

	switch (msg->mode_switch) {
		case px4::manual_control_setpoint::SWITCH_POS_NONE:
		ROS_WARN("Joystick button mapping error, main mode not set");
		break;

	case px4::manual_control_setpoint::SWITCH_POS_OFF:		// MANUAL
		msg_vehicle_status.main_state = msg_vehicle_status.MAIN_STATE_MANUAL;
		msg_vehicle_status.nav_state = msg_vehicle_status.NAVIGATION_STATE_MANUAL;
		msg_vehicle_control_mode.flag_control_manual_enabled = true;
		msg_vehicle_control_mode.flag_control_rates_enabled = true;
		msg_vehicle_control_mode.flag_control_attitude_enabled = true;
		msg_vehicle_control_mode.flag_control_altitude_enabled = false;
		msg_vehicle_control_mode.flag_control_climb_rate_enabled = false;
		msg_vehicle_control_mode.flag_control_position_enabled = false;
		msg_vehicle_control_mode.flag_control_velocity_enabled = false;

		break;

	case px4::manual_control_setpoint::SWITCH_POS_MIDDLE:		// ASSIST
		if (msg->posctl_switch == px4::manual_control_setpoint::SWITCH_POS_ON) {
			msg_vehicle_status.main_state = msg_vehicle_status.MAIN_STATE_POSCTL;
			msg_vehicle_status.nav_state = msg_vehicle_status.NAVIGATION_STATE_POSCTL;
			msg_vehicle_control_mode.flag_control_manual_enabled = true;
			msg_vehicle_control_mode.flag_control_rates_enabled = true;
			msg_vehicle_control_mode.flag_control_attitude_enabled = true;
			msg_vehicle_control_mode.flag_control_altitude_enabled = true;
			msg_vehicle_control_mode.flag_control_climb_rate_enabled = true;
			msg_vehicle_control_mode.flag_control_position_enabled = true;
			msg_vehicle_control_mode.flag_control_velocity_enabled = true;
		} else {
			msg_vehicle_status.main_state = msg_vehicle_status.MAIN_STATE_ALTCTL;
			msg_vehicle_status.nav_state = msg_vehicle_status.NAVIGATION_STATE_ALTCTL;
			msg_vehicle_control_mode.flag_control_manual_enabled = true;
			msg_vehicle_control_mode.flag_control_rates_enabled = true;
			msg_vehicle_control_mode.flag_control_attitude_enabled = true;
			msg_vehicle_control_mode.flag_control_altitude_enabled = true;
			msg_vehicle_control_mode.flag_control_climb_rate_enabled = true;
			msg_vehicle_control_mode.flag_control_position_enabled = false;
			msg_vehicle_control_mode.flag_control_velocity_enabled = false;
		}
		break;
	}

}

void Commander::OffboardControlModeCallback(const px4::offboard_control_modeConstPtr &msg)
{
	_msg_offboard_control_mode = *msg;

	/* Force system into offboard control mode */
	if (!_got_manual_control) {
		SetOffboardControl(_msg_offboard_control_mode, _msg_vehicle_control_mode);
		
		_msg_vehicle_status.timestamp = px4::get_time_micros();
		_msg_vehicle_status.hil_state = _msg_vehicle_status.HIL_STATE_OFF;
		_msg_vehicle_status.hil_state = _msg_vehicle_status.VEHICLE_TYPE_QUADROTOR;
		_msg_vehicle_status.is_rotary_wing = true;
		_msg_vehicle_status.arming_state = _msg_vehicle_status.ARMING_STATE_ARMED;
		

		_msg_actuator_armed.armed = true;
		_msg_actuator_armed.timestamp = px4::get_time_micros();

		_msg_vehicle_control_mode.timestamp = px4::get_time_micros();
		_msg_vehicle_control_mode.flag_armed = true;
		

		_vehicle_control_mode_pub.publish(_msg_vehicle_control_mode);
		_actuator_armed_pub.publish(_msg_actuator_armed);
		_vehicle_status_pub.publish(_msg_vehicle_status);
	}
}

int main(int argc, char **argv)
{
	ros::init(argc, argv, "commander");
	Commander m;
	ros::spin();
	return 0;
}