#!/bin/bash -e

SINK='@DEFAULT_AUDIO_SINK@'
NOTIFY=(notify-send -t 1000 -a "$(basename "$0")" -u low)

function update_vol() {
    if [[ "$1" =~ ^(-|\+)* ]]; then
        CUR="$(($CUR + $1 - $CUR % $1 + $CUR % $1 * 10 / $1 / 5 * $1))"
        [ "$CUR" -lt   0 ] && CUR=0
        [ "$CUR" -gt 150 ] && CUR=150
    else
        CUR="$1"
    fi
    wpctl set-volume "$SINK" "$CUR%"
}

read -r _ CUR MUTE < <(wpctl get-volume "$SINK")
CUR="$(("10#${CUR/./}"))"

if [ -z "$1" ]; then
    echo "$CUR"
    exit
elif [ "$1" == 'm' ] && [ -z "$MUTE" ]; then
    wpctl set-mute "$SINK" 1
    "${NOTIFY[@]}" -i audio-volume-muted -h string:synchronous:vol "Mute"
else
    if [[ "$1" =~ [0-9] ]]; then
        update_vol "$1"
    fi
    [ -n "$MUTE" ] && wpctl set-mute "$SINK" 0
    "${NOTIFY[@]}" -h string:synchronous:vol -h int:value:"$CUR" "$CUR%"
fi

# update sbar
kill -34 "$(cat "$HOME/.cache/pidofbar")"