#!/bin/bash

kill_all() {
	rm -f /tmp/uartmode* /tmp/ML_BAUD
	if fuser -k -TERM /dev/ttyS1 2>/dev/null; then
		sleep 0.1
		fuser -k -KILL /dev/ttyS1 2>/dev/null
	fi

	# TODO: Find a smarter way to kill only the pids spawned by midilink
	killall -KILL fluidsynth mpg123 mt32d 2>/dev/null
}

conn_speed=115200
[ -f /tmp/UART_SPEED ] && conn_speed=$(cat /tmp/UART_SPEED)

echo "ttyS1: "$conn_speed

if [ "$1" == "1" ]; then
	if [ ! -f /tmp/uartmode1 ]; then
		kill_all
		echo "1" >/tmp/uartmode1
		(
			while true
			do
				if [ -f /media/fat/linux/ppp_options ]; then
					
					localip=$(ifconfig 2>/dev/null | sed -En 's/127.0.0.1//;s/169.254.*//;s/.*inet (addr:)?(([0-9]*\.){3}[0-9]*).*/\2/p')
					remoteip=$(ifconfig 2>/dev/null | sed -En 's/127.0.0.1//;s/169.254.*//;s/.*inet (addr:)?(([0-9]*\.){2}[0-9]*).*/\2/p').254

					if [ -z $localip ]; then
						echo cannot get local IP for PPP link.
						localip=0.0.0.0
						remoteip=0.0.0.0
					else
						echo "PPP link: $localip->$remoteip"
					fi

					echo "$localip:$remoteip" >/tmp/ppp_options
					cat /media/fat/linux/ppp_options >>/tmp/ppp_options

					echo 1 > /proc/sys/net/ipv4/ip_forward
					taskset 1 pppd $conn_speed file /tmp/ppp_options
					status=$?
					case $status in
						1|2|3|4|6|7|9|137) echo "pppd exited with fatal error $status"; exit 0;;
					esac
				else
					echo "skip pppd"
					exit 0
				fi

				[ ! -f /tmp/uartmode1 ] && exit 0

				echo respawn pppd
				sleep 1
			done
		) &
	fi
elif [ "$1" == "2" ]; then
	if [ ! -f /tmp/uartmode2 ]; then
		kill_all
		echo "1" >/tmp/uartmode2
		(
			while true
			do
				taskset 1 agetty $conn_speed ttyS1 -h &
				wait $!

				[ ! -f /tmp/uartmode2 ] && exit 0

				echo respawn console
				sleep 1
			done 
		) &
	fi
elif [ "$1" == "3" ]; then
	if [ ! -f /tmp/uartmode3 ]; then
		kill_all
		echo "1" >/tmp/uartmode3
		(
			while true
			do
				taskset 1 midilink MENU QUIET &
				wait $!
			
				[ ! -f /tmp/uartmode3 ] && exit 0
			
				echo respawn midilink
				sleep 1
			done 
		) &
	fi
elif [ "$1" == "4" ]; then
	if [ ! -f /tmp/uartmode4 ]; then
		kill_all
		echo "1" >/tmp/uartmode4
		(
			while true
			do
				taskset 1 midilink MENU QUIET &
				wait $!

				[ ! -f /tmp/uartmode4 ] && exit 0

				echo respawn midilink
				sleep 1
			done 
		) &
	fi
elif [ "$1" == "5" ]; then
	if [ ! -f /tmp/uartmode5 ]; then
		kill_all
		echo "1" >/tmp/uartmode5
		(
			while true
			do
				taskset 1 midilink UDP QUIET BAUD $conn_speed 
				wait $!

				[ ! -f /tmp/uartmode5 ] && exit 0

				echo respawn midilink
				sleep 1
			done 
		) &
	fi
elif [ "$1" == "6" ]; then
	if [ ! -f /tmp/uartmode6 ]; then
		kill_all
		echo "1" >/tmp/uartmode6
		if [ -f /media/fat/snid ]; then
			(
				while true
				do
					RUST_LOG=info taskset 1 /media/fat/snid > /tmp/snid.log 2>&1
					wait $!

					[ ! -f /tmp/uartmode6 ] && exit 0

					echo respawn snid
					sleep 1
				done 
			) &
		fi
	fi
else
	if [ -f /tmp/uartmode* ]; then
		kill_all
	fi
fi