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#ifndef GLOBAL_POSITION_INT_HPP
#define GLOBAL_POSITION_INT_HPP

#include <uORB/topics/home_position.h>
#include <uORB/topics/vehicle_air_data.h>
#include <uORB/topics/vehicle_global_position.h>
#include <uORB/topics/vehicle_local_position.h>

class MavlinkStreamGlobalPositionInt : public MavlinkStream
{
public:
	static MavlinkStream *new_instance(Mavlink *mavlink) { return new MavlinkStreamGlobalPositionInt(mavlink); }

	static constexpr const char *get_name_static() { return "GLOBAL_POSITION_INT"; }
	static constexpr uint16_t get_id_static() { return MAVLINK_MSG_ID_GLOBAL_POSITION_INT; }

	const char *get_name() const override { return get_name_static(); }
	uint16_t get_id() override { return get_id_static(); }

	unsigned get_size() override
	{
		return _gpos_sub.advertised() ? MAVLINK_MSG_ID_GLOBAL_POSITION_INT_LEN + MAVLINK_NUM_NON_PAYLOAD_BYTES : 0;
	}

private:
	explicit MavlinkStreamGlobalPositionInt(Mavlink *mavlink) : MavlinkStream(mavlink) {}

	uORB::Subscription _gpos_sub{ORB_ID(vehicle_global_position)};
	uORB::Subscription _lpos_sub{ORB_ID(vehicle_local_position)};
	uORB::Subscription _home_sub{ORB_ID(home_position)};
	uORB::Subscription _air_data_sub{ORB_ID(vehicle_air_data)};

	bool send() override
	{
		vehicle_global_position_s gpos;
		vehicle_local_position_s lpos;

		if (_gpos_sub.update(&gpos) && _lpos_sub.update(&lpos)) {

			mavlink_global_position_int_t msg{};

			if (lpos.z_valid && lpos.z_global) {
				msg.alt = (-lpos.z + lpos.ref_alt) * 1000.0f;

			} else {
				// fall back to baro altitude
				vehicle_air_data_s air_data{};
				_air_data_sub.copy(&air_data);

				if (air_data.timestamp > 0) {
					msg.alt = air_data.baro_alt_meter * 1000.0f;
				}
			}

			home_position_s home{};
			_home_sub.copy(&home);

			if ((home.timestamp > 0) && home.valid_alt) {
				if (lpos.z_valid) {
					msg.relative_alt = -(lpos.z - home.z) * 1000.0f;

				} else {
					msg.relative_alt = msg.alt - (home.alt * 1000.0f);
				}

			} else {
				if (lpos.z_valid) {
					msg.relative_alt = -lpos.z * 1000.0f;
				}
			}

			msg.time_boot_ms = gpos.timestamp / 1000;
			msg.lat = gpos.lat * 1e7;
			msg.lon = gpos.lon * 1e7;

			msg.vx = lpos.vx * 100.0f;
			msg.vy = lpos.vy * 100.0f;
			msg.vz = lpos.vz * 100.0f;

			msg.hdg = math::degrees(matrix::wrap_2pi(lpos.heading)) * 100.0f;

			mavlink_msg_global_position_int_send_struct(_mavlink->get_channel(), &msg);

			return true;
		}

		return false;
	}
};

#endif // GLOBAL_POSITION_INT_HPP