#!/bin/bash -e

case "$1" in
    s)
        DEV='@DEFAULT_AUDIO_SINK@'
        SIG=34
        ;;
    m)
        DEV='@DEFAULT_AUDIO_SOURCE@'
        SIG=35
        ;;
    *)
        exit 1
        ;;
esac
shift

function update_vol() {
    case "$1" in
        +*|-*)
            # shellcheck disable=SC2017
            CUR=$((CUR + $1 - CUR % $1 + CUR % $1 * 10 / $1 / 5 * $1))
            if [ "$CUR" -lt 0 ]; then
                CUR=0
            elif [ "$CUR" -gt 300 ]; then
                CUR=300
            fi
            ;;
        *)
            CUR="$1"
    esac
    wpctl set-volume "$DEV" "$CUR%"
}

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

if [ -z "$1" ]; then
    echo "$CUR"
    exit
elif [ "$1" == 'm' ] && [ -z "$MUTE" ]; then
    wpctl set-mute "$DEV" 1
else
    if [[ "$1" =~ [0-9] ]]; then
        update_vol "$1"
    fi
    if [ -n "$MUTE" ]; then
        wpctl set-mute "$DEV" 0
    fi
fi

kill "-$SIG" "$(cat "$XDG_CACHE_HOME/sbar/pid")"