#!/bin/dash

printMuted() {
  if [ "$(pamixer --get-mute )" = "true" ]; then
    printf " (muted)"
  fi
}

sendNotification() {
  notify-send "$1" \
    -h string:x-canonical-private-synchronous:volume \
    -u low
  }

checkSingleAction() {
  if [ -n "$ACTION" ]; then
    echo "More than one action specified"
    exit 1
  fi
}

checkEmptyValue() {
  if [ -z "$VALUE" ]; then
    echo "Value needed to $ACTION volume"
    exit 1
  fi
}

ACTION=""
VALUE=""
NOTIFY="false"
PRINT="false"

while getopts "s:i:d:tnp" arg; do
  case $arg in
    s) checkSingleAction; ACTION="set"; VALUE=$OPTARG ;;
    i) checkSingleAction; ACTION="increase"; VALUE=$OPTARG ;;
    d) checkSingleAction; ACTION="decrease"; VALUE=$OPTARG ;;
    t) checkSingleAction; ACTION="toggle" ;;
    n) NOTIFY="true" ;;
    p) PRINT="true" ;;
    *) echo "Invalid argument"; exit 1 ;;
  esac
done

if test -z "$ACTION" && test "$NOTIFY" = "false" && test "$PRINT" = "false"; then
  echo "No action specified"
  exit 1
fi

case $ACTION in
  set) checkEmptyValue; pamixer --set-volume "$VALUE" ;;
  increase) checkEmptyValue; pamixer -i "$VALUE" ;;
  decrease) checkEmptyValue; pamixer -d "$VALUE" ;;
  toggle) pamixer -t ;;
esac

INFO="Volume: $(pamixer --get-volume)%$(printMuted)"

if [ "$NOTIFY" = "true" ]; then
  sendNotification "$INFO"
fi

if [ "$PRINT" = "true" ]; then
  echo "$INFO"
fi