#!/bin/sh
set -e
[ -n "$DEBUG" ] && set -x

if [ "$1" = "-h" ]; then
	printf "usage: %s [RESIZE_PERC] [MODE]\n" "$(basename "$0")"
	printf "\n"
	printf "MODE can be tr (for top-right) or empty (for center)\n"
	exit 2
fi

con=$(swq current con)
con_width=$(echo "$con" | jq -r '.window_rect.width')
con_height=$(echo "$con" | jq -r '.window_rect.height')

ws=$(swq current workspace)
ws_width=$(echo "$ws" | jq -r '.rect.width')
ws_height=$(echo "$ws" | jq -r '.rect.height')

if [ "$1" = "-w" ]; then
	shift
	printf "scaling relative to workspace\n"
	ratio=$(awk "BEGIN{print ($ws_width / $ws_height)}")
	con_width=$ws_width
	con_height=$ws_height
else
	printf "scaling relative to container\n"
	ratio=$(awk "BEGIN{print ($con_width / $con_height)}")
fi

if [ -n "$1" ] || [ ! "$1" = "-" ]; then
	perc="$1"
	con_height=$(awk "BEGIN{print int($con_height * $perc)}")
	con_width=$(awk "BEGIN{print int($con_height * $ratio)}")
fi

if awk "BEGIN{ if (${perc} > 2.0) exit 0; else exit 1; }"; then
	printf "scaling factor %.1f larger than 200%%, aborting...\n" "${perc}"
	exit 1
fi

case "$2" in
	tl) # top-left
		tar_x=0
		tar_y=0
		;;
	tm) # top-middle
		tar_x=$(awk "BEGIN{print int(($ws_width - $con_width)/2)}")
		tar_y=0
		;;
	tr) # top-right
		tar_x=$(awk "BEGIN{print int($ws_width - $con_width)}")
		tar_y=0
		;;
	rm) # right-middle
		tar_x=$(awk "BEGIN{print int($ws_width - $con_width)}")
		tar_y=$(awk "BEGIN{print int(($ws_height - $con_height)/2)}")
		;;
	br) # bottom-right
		tar_x=$(awk "BEGIN{print int($ws_width - $con_width)}")
		tar_y=$(awk "BEGIN{print int($ws_height - $con_height)}")
		;;
	bm) # bottom-middle
		tar_x=$(awk "BEGIN{print int(($ws_width - $con_width)/2)}")
		tar_y=$(awk "BEGIN{print int($ws_height - $con_height)}")
		;;
	bl) # bottom-left
		tar_x=0
		tar_y=$(awk "BEGIN{print int($ws_height - $con_height)}")
		;;
	lm) # left-middle
		tar_x=0
		tar_y=$(awk "BEGIN{print int(($ws_height - $con_height)/2)}")
		;;
	noop) # noop
		;;
	c | *) # center
		tar_x=$(awk "BEGIN{print int(($ws_width - $con_width)/2)}")
		tar_y=$(awk "BEGIN{print int(($ws_height - $con_height)/2)}")
		;;
esac

echo "ws: $ws_width x $ws_height"
echo "con: $con_width x $con_height"
echo "moveto: $tar_x x $tar_y"

con_id=$(echo "$con" | jq -r '.id')
swaymsg [con_id="$con_id"] resize set "$con_width" "$con_height"
swaymsg [con_id="$con_id"] move position "$tar_x" "$tar_y"