#!/bin/bash

# Display a notification indicating the volume is muted.
notify_muted() {
  local icon="audio-volume-muted-symbolic.symbolic"
  beep
  dunstify \
    -i $icon \
    -t 5000 \
    -h int:value:0 \
    -h string:synchronous:volume \
    -r 1000 \
    "Volume muted"
}

# Display a notification indicating the current volume.
notify_volume() {
  local vol

  vol=$(pamixer --get-volume)
  beep
  dunstify \
    -i "$(get_volume_icon "$vol")" \
    -t 5000 \
    -h int:value:"$vol" \
    -r 1000 \
    -h string:synchronous:volume \
    "$(printf "Volume %03s%%" "$vol")"
}

# Play a little beep.
beep() {
  pw-play /usr/share/sounds/freedesktop/stereo/audio-volume-change.oga
}

# Gets an icon for the provided volume. The volume provided should be a
# percentage (but without the % suffix).
get_volume_icon() {
  local vol="$1" icon
  if [ "$vol" -gt 100 ]; then
    icon="audio-volume-overamplified-symbolic.symbolic"
  elif [ "$vol" -ge 70 ]; then
    icon="audio-volume-high-symbolic.symbolic"
  elif [ "$vol" -ge 40 ]; then
    icon="audio-volume-medium-symbolic.symbolic"
  elif [ "$vol" -gt 0 ]; then
    icon="audio-volume-low-symbolic.symbolic"
  else
    icon="audio-volume-low-symbolic.symbolic"
  fi
  echo "$icon"
}

case $1 in
  up)
    pamixer --increase 5
    notify_volume
    ;;
  down)
    pamixer --decrease 5
    notify_volume
    ;;
  mute)
    if ! eval $(pamixer --get-mute); then
      notify_muted
    fi
    pamixer --toggle-mute
    if ! eval $(pamixer --get-mute); then
      notify_volume
    fi
    ;;
  *)
    echo "Unrecognized command: $1" >&2
    exit 1
    ;;
esac