GMusicProxy-mpd prealpha

#!/bin/bash
Check()
{
[[ -z "${1// }" ]] &&   printf "Empty argument or spaces!\n" && exit
}

Artist()
{
printf "Enter mode\n 1 - search\n 2 - discography\n 3 - top\n"
read mode
Check $mode
case "$mode" in
    "1" )   url="http://localhost:9999/get_by_search?type=artist&artist=${1// /%20}";;
    "2" )   id=$(curl -L# "http://localhost:9999/search_id?type=artist&artist=$1")
        url="http://localhost:9999/get_discography_artist?id=$id";;
    "3" )   id=$(curl -L# "http://localhost:9999/search_id?type=artist&artist=$1")
        url="http://localhost:9999/get_top_tracks_artist?id=$id&type=artist";;
esac
}

Search()
{
printf "\nEnter $1\n"
read data
Check $data
case "$1" in
    "artist" )  Artist $data;;
    "album"  )  id=$(curl -L# "http://localhost:9999/search_id?type=album&title=${data// /%20}")
            [[ -z "${id// }" ]] && printf "No matches found\n" && exit
            url="http://localhost:9999/get_album?id=$id";;
    "song" )    id=$(curl -L# "http://localhost:9999/search_id?type=song&title=${data// /%20}")
            [[ -z "${id// }" ]] && printf "No matches found\n" && exit
            url="http://localhost:9999/get_song?id=$id";;
    "matches" ) exit
esac
curl -s $url > /var/lib/mpd/playlists/${data// /_}.m3u
mpc load ${data// /_}
}

printf "GMusicProxy-mpc brigde by Essir\n"
mode=0
while [ "$mode" != "exit" ]
do
printf "Enter:\n 1 - Artist\n 2 - Album\n 3 - Song\n 4 - Any matches\n exit - obviosly\n"
read mode
Check $mode
case "$mode" in
    "1" )   Search "artist";;
    "2" )   Search "album";;
    "3" )   Search "song";;
    "4" )   Search "matches";;
esac
done