#!/bin/sh

err() {
	printf "${1} \n"
	exit 1
}

help() {
cat << EOF
$0: Wrapper script to change volume

options:
 -i [Vol]	Increase volume by Vol
 -d [Vol]	Decrease volume by Vol
 -s [Vol] 	Set volume to Vol
 -p		Show the current volume
 -t		Toggle between mute and unmute
 -h 		Print this message and exit
EOF
}

if [ $# != 1 ] && [ $# != 2 ]; then
	err "${0}: Invalid usage\nTry \'$0 -h\' for help."
fi

while getopts "i:d:s:pth" option; do
	case "${option}" in
	i)
		pactl set-sink-volume @DEFAULT_SINK@ +"${OPTARG}"% \
		> /dev/null 2>&1 && exit 0 \
		|| err "${0}: Failed to increase"
	;;
	d)
		pactl set-sink-volume @DEFAULT_SINK@ -"${OPTARG}"% \
		> /dev/null 2>&1 && exit 0 \
		|| err "${0}: Failed to decrease"
	;;
	s)
		pactl set-sink-volume @DEFAULT_SINK@ "${OPTARG}"% \
		> /dev/null 2>&1 && exit 0 \
		|| err "${0}: Failed to set"
	;;
	p)
		pactl get-sink-volume @DEFAULT_SINK@ 2>/dev/null\
		|| err "${0}: Failed"
	;;
	t)
		pactl set-sink-volume @DEFAULT_SINK@ toggle \
		> /dev/null 2>&1 && exit 0 \
		|| err "${0}: Failed to toggle"
	;;
	h)
		help
		exit 0
		;;
	*)
		err "Try \'${0} -h\' for help"

	;;

	esac
done