#!/usr/bin/env zsh

setopt rcquotes

function print_help {
    echo "usage: sound-control.sh [-n] [-h] <command>"
    echo 'Options:'
    echo '  -h:     print this message, then exit'
    echo '  -n:     don''t notify the volume'
    echo 'Commands:'
    echo '  up:     increase the volume (default: 5%)'
    echo '  down:   decrease the volume (default: 5%)'
    echo '  set:    set the volume'
    echo '  mute:   toggle the mute with no argument, or set it with one'
    echo '  help:   print this message, then exit'
    echo '  notify: notify the volume, then exit (do nothing with -n)'
}

let notify=1

function notify_vol {
    if ! ((${notify})); then
        return
    fi
    let vol="$(pamixer --get-volume)"
    local icon
    if [[ "$(pamixer --get-mute)" == 'true' ]]; then
        icon='󰸈'
    elif (( ${vol} > 50 )); then
        icon='󰕾'
    elif (( ${vol} >= 0 )); then
        icon='󰖀'
    else
        icon='？'
    fi
    notify-send -h string:x-canonical-private-synchronous:sound-control-sh \
                -t 4000 \
                -u normal \
                -a "Volume" \
                -h int:value:"${vol}" \
                "${icon}"
}

function check_number {
    if ! [[ -z "${1}" ]] && ! [[ "${1}" =~ '^-?[0-9]+%?$' ]]; then
        echo "error: not a valid number: \"${1}\""
        exit 1
    fi
}

if [[ "${1}" == '-n' ]]; then
    shift 1
    notify=0
fi

case "${1}" in
    -h|help|'')
        print_help
        ;;
    up)
        check_number "${2}"
        pamixer -i "${${2:-5}%'%'}"
        notify_vol
        ;;
    down)
        check_number "${2}"
        pamixer -d "${${2:-5}%'%'}"
        notify_vol
        ;;
    set)
        (( ${#} >= 2 )) || { echo 'error: no input value'; exit 1 }
        check_number "${2}"
        pamixer --set-volume "${2%'%'}"
        notify_vol
        ;;
    mute)
        if (( ${#} >= 2 )); then
            if [[ "${2:l}" =~ '^y(es?)?$' ]]; then
                pamixer -m
            elif [[ "${2:l}" =~ '^no?$' ]]; then
                pamixer -u
            else
                echo "error: must be one of 'yes' or 'no': \"${2}\""
                exit 1
            fi
        else
            pamixer -t
        fi
        notify_vol
        ;;
    notify)
        notify_vol
        ;;
    *)
        echo "error: unknown command: \"${1}\""
        print_help
        exit 1
        ;;
esac