#!/bin/sh
wfb_key=/etc/drone.key
wfb_dev=wlan0

echo_log() {
	echo "$1" | logger -s -t wifibroadcast
}

wfb_yaml() {
	if [ -e "$1" ]; then
		while IFS=: read -r key value; do
			key=$(eval echo "$key")
			value=$(eval echo "$value")
			export "$key=$value"
		done < "$1"
	fi
}

load_config() {
	wfb_yaml /etc/wfb.yaml
	[ ! -e "$wfb_key" ] && wfb_key=/rom/etc/drone.key
}

load_modules() {
	for card in $(lsusb | awk '{print $6}' | uniq); do
		case "$card" in
			"0bda:8812" | "0bda:881a" | "0b05:17d2" | "2357:0101" | "2604:0012")
				driver=88XXau
				modprobe "$driver"
				;;

			"0bda:a81a")
				driver=8812eu
				modprobe "$driver" rtw_regd_src=1 rtw_tx_pwr_by_rate=0 rtw_tx_pwr_lmt_enable=0
				;;

			"0bda:f72b" | "0bda:b733")
				driver=8733bu
				modprobe "$driver" rtw_regd_src=1 rtw_tx_pwr_by_rate=0 rtw_tx_pwr_lmt_enable=0
				;;
		esac
	done

	if [ -z "$driver" ]; then
		echo_log "Wireless module not detected!"
		exit 1
	fi

	echo_log "Detected driver: $driver"
	if ! ifconfig "$wfb_dev" up; then
		echo_log "Wireless driver not found!"
		exit 1
	fi
}

load_interface() {
	iw "$wfb_dev" set monitor none

	[ "$width" = "40" ] && wfb_width=HT40+ || wfb_width=HT20
	iw "$wfb_dev" set channel "$channel" "$wfb_width"
	iw reg set 00

	[ "$driver" = "88XXau" ] && wfb_power=$((txpower * -100)) || wfb_power=$((txpower * 50))
	iw "$wfb_dev" set txpower fixed "$wfb_power"
}

start_broadcast() {
	echo_log "Starting wfb_tx"
	wfb_tx -K "$wfb_key" -M "$mcs_index" -B "$width" -k "$fec_k" -n "$fec_n" \
		-S "$stbc" -L "$ldpc" -i "$link_id" -C 8000 -G short "$wfb_dev" &> /dev/null &
}

start_tunnel() {
	echo_log "Starting wfb_tun"
	wfb_rx -K "$wfb_key" -i "$link_id" -p 160 -u 5800 "$wfb_dev" &> /dev/null &
	wfb_tx -K "$wfb_key" -M "$tun_index" -B "$width" -k "$fec_k" -n "$fec_n" \
		-S "$stbc" -L "$ldpc" -i "$link_id" -p 32 -u 5801 "$wfb_dev" &> /dev/null &
	wfb_tun -a 10.5.0.10/24 > /dev/null &
}

start_telemetry() {
	chipset=$(ipcinfo -c)
	[ "$chipset" = "ssc33x" ] && devmem 0x1F207890 16 0x8

	echo_log "Starting $router"
	if [ "$router" = "mavfwd" ]; then
		mavfwd -b 115200 -c 8 -p 100 -a 15 -t -m /dev/"$serial" \
			-i 0.0.0.0:14550 -o 10.5.0.1:14551 > /dev/null &
	else
		if [ "$router" = "msposd" ]; then
			size=$(curl -s localhost/api/v1/config.json | jsonfilter -e "@.video0.size")
		fi
		msposd -b 115200 -c 8 -r "$osd_fps" -m /dev/"$serial" \
			-o 10.5.0.1:14551 -z "$size" > /dev/null &
	fi
}

video_settings() {
	sensor=$(ipcinfo -s)
	cli -s .isp.sensorConfig /etc/sensors/"$sensor"_fpv.bin
	cli -s .isp.exposure 5
	cli -s .video0.fps 60
	cli -s .video0.bitrate 8192
	cli -s .video0.codec h265
	cli -s .video0.rcMode cbr
	cli -s .outgoing.enabled true
	cli -s .outgoing.server udp://0.0.0.0:5600
	cli -s .fpv.enabled true
	cli -s .fpv.noiseLevel 1
}

start() {
	load_config
	load_modules
	load_interface

	if [ ! -e /etc/system.ok ]; then
		sleep 1
		video_settings
		touch /etc/system.ok
		killall -1 majestic
	fi

	stop
	start_broadcast
	start_tunnel
	start_telemetry
}

stop() {
	for process in wfb_rx wfb_tx wfb_tun msposd mavfwd; do
		if [ -n "$(pidof $process)" ]; then
			echo_log "Stopping $process"
			killall -q "$process"
		fi
	done
}

case "$1" in
	start|stop)
		$1
		;;

	resetv)
		cp -f /rom/etc/majestic.yaml /etc/majestic.yaml
		video_settings
		;;

	resetw)
		cp -f /rom/etc/wfb.yaml /etc/wfb.yaml
		start
		;;

	*)
		echo "Usage: $0 {start|stop|resetv|resetw}"
		exit 1
		;;
esac