#!/bin/sh

if [ -z "$1" ]; then
	echo "Usage: $0 <display> [touchinput]"
	exit 1
fi

trap 'kill $(jobs -p)' SIGINT SIGTERM

rotate() {
	if [ "$3" = "normal" ]; then
		swaymsg output "$1" transform 0
		show_keyboard=0
	elif [ "$3" = "left-up" ]; then
		swaymsg output "$1" transform 270
	elif [ "$3" = "right-up" ]; then
		swaymsg output "$1" transform 90
	elif [ "$3" = "bottom-up" ]; then
		swaymsg output "$1" transform 180
	else
		echo "Ignoring rotation: $3"
		continue
	fi

	if ! [ -z "$2" ]; then
		swaymsg input "$2" map_to_output "$1"
	fi
}

monitorer() {
	physrot=normal
	screenrot=normal
	rotatorpid=

	while read -r line; do
		line="${line#??}"
		physrot="$line"
		if [ -f ~/.rotation-lock ]; then
			if [ -n "$rotatorpid" ]; then
				kill "$rotatorpid"
			fi
			(inotifywait -e delete_self ~/.rotation-lock; rotate "$1" "$2" "$physrot") &
			rotatorpid=$!
		else
			rotate "$1" "$2" "$physrot"
			screenrot="$physrot"
		fi
	done
}

monitor-sensor \
	| grep --line-buffered "Accelerometer orientation changed" \
	| grep --line-buffered -o ": .*" \
	| monitorer "$1" "$2"