#!/bin/sh
# shellcheck disable=SC2154

# Simulator IMU data provided at 250 Hz
param set-default IMU_INTEG_RATE 250

if [ "$PX4_SIMULATOR" = "sihsim" ] || [ "$(param show -q SYS_AUTOSTART)" -eq "0" ]; then

	echo "INFO  [init] SIH simulator"

	if [ -n "${PX4_HOME_LAT}" ]; then
		param set SIH_LOC_LAT0 ${PX4_HOME_LAT}
	fi

	if [ -n "${PX4_HOME_LON}" ]; then
		param set SIH_LOC_LON0 ${PX4_HOME_LON}
	fi
	if [ -n "${PX4_HOME_ALT}" ]; then
		param set SIH_LOC_H0 ${PX4_HOME_ALT}
	fi

	if simulator_sih start; then

		if param compare -s SENS_EN_BAROSIM 1
		then
			sensor_baro_sim start
		fi
		if param compare -s SENS_EN_GPSSIM 1
		then
			sensor_gps_sim start
		fi
		if param compare -s SENS_EN_MAGSIM 1
		then
			sensor_mag_sim start
		fi
		if param compare -s SENS_EN_AGPSIM 1
		then
			sensor_agp_sim start
		fi

	else
		echo "ERROR [init] simulator_sih failed to start"
		exit 1
	fi

elif [ "$PX4_SIMULATOR" = "gz" ] || [ "$(param show -q SIM_GZ_EN)" = "1" ]; then
	# Use Gazebo

	echo "INFO  [init] Gazebo simulator"

	# Only start up Gazebo if PX4_GZ_STANDALONE is not set.
	if [ -z "${PX4_GZ_STANDALONE}" ]; then

		# "gz sim" only available in Garden and later
		GZ_SIM_VERSIONS=$(gz sim --versions 2>&1)
		if [ $? -eq 0 ] && [ "${GZ_SIM_VERSIONS}" != "" ]
		then
			# "gz sim" from Garden on
			gz_command="gz"
			gz_sub_command="sim"

			# Specify render engine if `GZ_SIM_RENDER_ENGINE` is set
			# (for example, if you want to use Ogre 1.x instead of Ogre 2.x):
			if [ -n "${PX4_GZ_SIM_RENDER_ENGINE}" ]; then
				echo "INFO  [init] Setting Gazebo render engine to '${PX4_GZ_SIM_RENDER_ENGINE}'!"
				gz_sub_command="${gz_sub_command} --render-engine ${PX4_GZ_SIM_RENDER_ENGINE}"
			fi
		else
			echo "ERROR [init] Gazebo gz please install gz-garden"
			exit 1
		fi

		# look for running ${gz_command} gazebo world
		gz_world=$( ${gz_command} topic -l | grep -m 1 -e "^/world/.*/clock" | sed 's/\/world\///g; s/\/clock//g' )

		# shellcheck disable=SC2153
		if [ -z "${gz_world}" ] && [ -n "${PX4_GZ_WORLD}" ]; then

			# source generated gz_env.sh for GZ_SIM_RESOURCE_PATH
			if [ -f ./gz_env.sh ]; then
				. ./gz_env.sh

			elif [ -f ../gz_env.sh ]; then
				. ../gz_env.sh
			fi

			echo "INFO  [init] starting gazebo with world: ${PX4_GZ_WORLDS}/${PX4_GZ_WORLD}.sdf"

			${gz_command} ${gz_sub_command} --verbose=1 -r -s "${PX4_GZ_WORLDS}/${PX4_GZ_WORLD}.sdf" &

			if [ -z "${HEADLESS}" ]; then
				# HEADLESS not set, starting gui
				${gz_command} ${gz_sub_command} -g &
			fi

		else
			# Gazebo is already running, do not start the simulator, nor the GUI
			echo "INFO  [init] gazebo already running world: ${gz_world}"
			PX4_GZ_WORLD=${gz_world}
		fi
	else
		echo "INFO  [init] Standalone PX4 launch, waiting for Gazebo"
	fi

	# start gz_bridge
	if [ -n "${PX4_SIM_MODEL#*gz_}" ] && [ -z "${PX4_GZ_MODEL_NAME}" ]; then
		# model specified, gz_bridge will spawn model

		if [ -n "${PX4_GZ_MODEL_POSE}" ]; then
			# model pose provided: [x, y, z, roll, pitch, yaw]

			# Clean potential input line formatting.
			model_pose="$( echo "${PX4_GZ_MODEL_POSE}" | sed -e 's/^[ \t]*//; s/[ \t]*$//; s/,/ /g; s/  / /g; s/ /,/g' )"
			echo "INFO  [init] PX4_GZ_MODEL_POSE set, spawning at: ${model_pose}"

		else
			# model pose not provided, origin will be used

			echo "WARN  [init] PX4_GZ_MODEL_POSE not set, spawning at origin."
			model_pose="0,0,0,0,0,0"
		fi

		# start gz bridge with pose arg.
		if ! gz_bridge start -p "${model_pose}" -m "${PX4_SIM_MODEL#*gz_}" -w "${PX4_GZ_WORLD}" -i "${px4_instance}"; then
			echo "ERROR [init] gz_bridge failed to start and spawn model"
			exit 1
		fi

	elif [ -n "${PX4_GZ_MODEL_NAME}" ]; then
		# model name specificed, gz_bridge will attach to existing model

		echo "INFO  [init] PX4_GZ_MODEL_NAME set, PX4 will attach to existing model"
		if ! gz_bridge start -n "${PX4_GZ_MODEL_NAME}" -w "${PX4_GZ_WORLD}"; then
			echo "ERROR [init] gz_bridge failed to start and attach to existing model"
			exit 1
		fi

	else
		echo "ERROR [init] failed to pass only PX4_GZ_MODEL_NAME or PX4_SIM_MODEL"
		exit 1
	fi

	# Start the sensor simulator modules
	if param compare -s SENS_EN_BAROSIM 1
	then
		sensor_baro_sim start
	fi
	if param compare -s SENS_EN_GPSSIM 1
	then
		sensor_gps_sim start
	fi
	if param compare -s SENS_EN_MAGSIM 1
	then
		sensor_mag_sim start
	fi
	if param compare -s SENS_EN_ARSPDSIM 1
	then
		sensor_airspeed_sim start
	fi
	if param compare -s SENS_EN_AGPSIM 1
	then
		sensor_agp_sim start
	fi

elif [ "$PX4_SIM_MODEL" = "jmavsim_iris" ] || [ "$(param show -q SYS_AUTOSTART)" -eq "10017" ]; then

	echo "INFO  [init] jMAVSim simulator"

	if jps | grep -i jmavsim; then
		kill "$(jps | grep -i jmavsim | awk '{print $1}')" || true
		sleep 1
	fi

	param set IMU_INTEG_RATE 250
	./jmavsim_run.sh -l -r 250 &

	simulator_mavlink start -h localhost $((4560+px4_instance))

else
	# otherwise start simulator (mavlink) module

	# EKF2 specifics
	param set-default EKF2_GPS_DELAY 10
	param set-default EKF2_MULTI_IMU 3
	param set-default SENS_IMU_MODE 0

	simulator_tcp_port=$((4560+px4_instance))

	# Check if PX4_SIM_HOSTNAME environment variable is empty
	# If empty check if PX4_SIM_HOST_ADDR environment variable is empty
	# If both are empty use localhost for simulator
	if [ -z "${PX4_SIM_HOSTNAME}" ]; then

		if [ -z "${PX4_SIM_HOST_ADDR}" ]; then
			echo "INFO  [init] PX4_SIM_HOSTNAME: localhost"
			simulator_mavlink start -c $simulator_tcp_port
		else
			echo "INFO  [init] PX4_SIM_HOSTNAME: ${PX4_SIM_HOST_ADDR}"
			simulator_mavlink start -t "${PX4_SIM_HOST_ADDR}" "${simulator_tcp_port}"
		fi

	else
		echo "INFO  [init] PX4_SIM_HOSTNAME: ${PX4_SIM_HOSTNAME}"
		simulator_mavlink start -h "${PX4_SIM_HOSTNAME}" "${simulator_tcp_port}"
	fi

fi